Patchwork [01/14] sparc32: drop sun4c support

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Submitter Sam Ravnborg
Date May 11, 2012, 9:35 p.m.
Message ID <1336772117-1539-1-git-send-email-sam@ravnborg.org>
Download mbox | patch
Permalink /patch/158601/
State Accepted
Delegated to: David Miller
Headers show

Comments

Sam Ravnborg - May 11, 2012, 9:35 p.m.
Machines with sun4c support are very rare these days, and noone
is using them for any practical purposes.
The sun4c support has been know broken for quite some time too.

So rather than trying to keep it up-to-date, lets get rid of it.
This allows us to do some very welcome cleanup of sparc32 support.

Updated the former sun4c specifc nmi (which was also used
for sun4m UP) to be a generic UP NMI.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 arch/sparc/include/asm/head_32.h  |   10 -
 arch/sparc/include/asm/oplib_32.h |    8 -
 arch/sparc/kernel/Makefile        |    2 +-
 arch/sparc/kernel/entry.S         |   20 +-
 arch/sparc/kernel/head_32.S       |    7 +-
 arch/sparc/kernel/irq_32.c        |    5 -
 arch/sparc/kernel/kernel.h        |    3 -
 arch/sparc/kernel/process_32.c    |    2 +-
 arch/sparc/kernel/sun4c_irq.c     |  269 -----
 arch/sparc/mm/Makefile            |    4 -
 arch/sparc/mm/sun4c.c             | 2166 -------------------------------------
 arch/sparc/prom/Makefile          |    1 -
 arch/sparc/prom/segment.c         |   28 -
 13 files changed, 11 insertions(+), 2514 deletions(-)
 delete mode 100644 arch/sparc/kernel/sun4c_irq.c
 delete mode 100644 arch/sparc/mm/sun4c.c
 delete mode 100644 arch/sparc/prom/segment.c

Patch

diff --git a/arch/sparc/include/asm/head_32.h b/arch/sparc/include/asm/head_32.h
index 7c35491..5ceb7fa 100644
--- a/arch/sparc/include/asm/head_32.h
+++ b/arch/sparc/include/asm/head_32.h
@@ -80,16 +80,6 @@ 
 #define TRAP_ENTRY_INTERRUPT(int_level) \
         mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
 
-/* NMI's (Non Maskable Interrupts) are special, you can't keep them
- * from coming in, and basically if you get one, the shows over. ;(
- * On the sun4c they are usually asynchronous memory errors, on the
- * the sun4m they could be either due to mem errors or a software
- * initiated interrupt from the prom/kern on an SMP box saying "I
- * command you to do CPU tricks, read your mailbox for more info."
- */
-#define NMI_TRAP \
-        rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop;
-
 /* Window overflows/underflows are special and we need to try to be as
  * efficient as possible here....
  */
diff --git a/arch/sparc/include/asm/oplib_32.h b/arch/sparc/include/asm/oplib_32.h
index 71e5e9a..2751787 100644
--- a/arch/sparc/include/asm/oplib_32.h
+++ b/arch/sparc/include/asm/oplib_32.h
@@ -105,14 +105,6 @@  extern void prom_write(const char *buf, unsigned int len);
 extern int prom_startcpu(int cpunode, struct linux_prom_registers *context_table,
 			 int context, char *program_counter);
 
-/* Sun4/sun4c specific memory-management startup hook. */
-
-/* Map the passed segment in the given context at the passed
- * virtual address.
- */
-extern void prom_putsegment(int context, unsigned long virt_addr,
-			    int physical_segment);
-
 /* Initialize the memory lists based upon the prom version. */
 void prom_meminit(void);
 
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index cb85458..bfb93c3 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -28,7 +28,7 @@  obj-y                   += traps_$(BITS).o
 
 # IRQ
 obj-y                   += irq_$(BITS).o
-obj-$(CONFIG_SPARC32)   += sun4m_irq.o sun4c_irq.o sun4d_irq.o
+obj-$(CONFIG_SPARC32)   += sun4m_irq.o sun4d_irq.o
 
 obj-y                   += process_$(BITS).o
 obj-y                   += signal_$(BITS).o
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index f445e98..e0e0b81 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -317,8 +317,8 @@  maybe_smp4m_msg_out:
 	RESTORE_ALL
 
 	.align	4
-	.globl	linux_trap_ipi15_sun4m
-linux_trap_ipi15_sun4m:
+	.globl	linux_trap_ipi15
+linux_trap_ipi15:
 	SAVE_ALL
 	sethi	%hi(0x80000000), %o2
 	GET_PROCESSOR4M_ID(o0)
@@ -760,20 +760,12 @@  setcc_trap_handler:
 	jmp	%l2		! advance over trap instruction
 	rett	%l2 + 0x4	! like this...
 
+#ifndef CONFIG_SMP
 	.align	4
-	.globl	linux_trap_nmi_sun4c
-linux_trap_nmi_sun4c:
+	.globl	linux_trap_ipi15
+linux_trap_ipi15:
 	SAVE_ALL
 
-	/* Ugh, we need to clear the IRQ line.  This is now
-	 * a very sun4c specific trap handler...
-	 */
-	sethi	%hi(interrupt_enable), %l5
-	ld	[%l5 + %lo(interrupt_enable)], %l5
-	ldub	[%l5], %l6
-	andn	%l6, INTS_ENAB, %l6
-	stb	%l6, [%l5]
-
 	/* Now it is safe to re-enable traps without recursion. */
 	or	%l0, PSR_PIL, %l0
 	wr	%l0, PSR_ET, %psr
@@ -797,6 +789,8 @@  linux_trap_nmi_sun4c:
 
 	RESTORE_ALL
 
+#endif /* CONFIG_SMP */
+
 	.align	4
 	.globl	invalid_segment_patch1_ff
 	.globl	invalid_segment_patch2_ff
diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S
index 5877857..054a49f 100644
--- a/arch/sparc/kernel/head_32.S
+++ b/arch/sparc/kernel/head_32.S
@@ -111,11 +111,8 @@  t_irq12:TRAP_ENTRY_INTERRUPT(12)            /* IRQ Zilog serial chip         */
 t_irq13:TRAP_ENTRY_INTERRUPT(13)            /* IRQ Audio Intr.               */
 t_irq14:TRAP_ENTRY_INTERRUPT(14)            /* IRQ Timer #2                  */
 	.globl	t_nmi
-#ifndef CONFIG_SMP
-t_nmi:	NMI_TRAP                            /* Level 15 (NMI)                */
-#else
-t_nmi:	TRAP_ENTRY(0x1f, linux_trap_ipi15_sun4m)
-#endif
+t_nmi:	TRAP_ENTRY(0x1f, linux_trap_ipi15)
+
 t_racc:	TRAP_ENTRY(0x20, do_reg_access)     /* General Register Access Error */
 t_iacce:BAD_TRAP(0x21)                      /* Instr Access Error            */
 t_bad22:BAD_TRAP(0x22) BAD_TRAP(0x23)
diff --git a/arch/sparc/kernel/irq_32.c b/arch/sparc/kernel/irq_32.c
index 4a2b801..998d90c 100644
--- a/arch/sparc/kernel/irq_32.c
+++ b/arch/sparc/kernel/irq_32.c
@@ -346,11 +346,6 @@  void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
 void __init init_IRQ(void)
 {
 	switch (sparc_cpu_model) {
-	case sun4c:
-	case sun4:
-		sun4c_init_IRQ();
-		break;
-
 	case sun4m:
 		pcic_probe();
 		if (pcic_present())
diff --git a/arch/sparc/kernel/kernel.h b/arch/sparc/kernel/kernel.h
index 8abbad3..8278df5 100644
--- a/arch/sparc/kernel/kernel.h
+++ b/arch/sparc/kernel/kernel.h
@@ -43,9 +43,6 @@  extern spinlock_t irq_action_lock;
 extern void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs);
 extern void init_IRQ(void);
 
-/* sun4c_irq.c */
-extern void sun4c_init_IRQ(void);
-
 /* sun4m_irq.c */
 extern void sun4m_init_IRQ(void);
 extern void sun4m_unmask_profile_irq(void);
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index efa0754..de81e21 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -100,7 +100,7 @@  void cpu_idle(void)
 				printk("kernel faults / second = %ld\n", fps);
 #endif
 				if (fps >= SUN4C_FAULT_HIGH) {
-					sun4c_grow_kernel_ring();
+					/*sun4c_grow_kernel_ring();*/
 				}
 			}
 			local_irq_enable();
diff --git a/arch/sparc/kernel/sun4c_irq.c b/arch/sparc/kernel/sun4c_irq.c
deleted file mode 100644
index 39c6421..0000000
--- a/arch/sparc/kernel/sun4c_irq.c
+++ /dev/null
@@ -1,269 +0,0 @@ 
-/*
- * sun4c irq support
- *
- *  djhr: Hacked out of irq.c into a CPU dependent version.
- *
- *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *  Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
- *  Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
- *  Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
- */
-
-#include <linux/init.h>
-
-#include <asm/oplib.h>
-#include <asm/timer.h>
-#include <asm/irq.h>
-#include <asm/io.h>
-
-#include "irq.h"
-
-/* Sun4c interrupts are typically laid out as follows:
- *
- *  1 - Software interrupt, SBUS level 1
- *  2 - SBUS level 2
- *  3 - ESP SCSI, SBUS level 3
- *  4 - Software interrupt
- *  5 - Lance ethernet, SBUS level 4
- *  6 - Software interrupt
- *  7 - Graphics card, SBUS level 5
- *  8 - SBUS level 6
- *  9 - SBUS level 7
- * 10 - Counter timer
- * 11 - Floppy
- * 12 - Zilog uart
- * 13 - CS4231 audio
- * 14 - Profiling timer
- * 15 - NMI
- *
- * The interrupt enable bits in the interrupt mask register are
- * really only used to enable/disable the timer interrupts, and
- * for signalling software interrupts.  There is also a master
- * interrupt enable bit in this register.
- *
- * Interrupts are enabled by setting the SUN4C_INT_* bits, they
- * are disabled by clearing those bits.
- */
-
-/*
- * Bit field defines for the interrupt registers on various
- * Sparc machines.
- */
-
-/* The sun4c interrupt register. */
-#define SUN4C_INT_ENABLE  0x01     /* Allow interrupts. */
-#define SUN4C_INT_E14     0x80     /* Enable level 14 IRQ. */
-#define SUN4C_INT_E10     0x20     /* Enable level 10 IRQ. */
-#define SUN4C_INT_E8      0x10     /* Enable level 8 IRQ. */
-#define SUN4C_INT_E6      0x08     /* Enable level 6 IRQ. */
-#define SUN4C_INT_E4      0x04     /* Enable level 4 IRQ. */
-#define SUN4C_INT_E1      0x02     /* Enable level 1 IRQ. */
-
-/*
- * Pointer to the interrupt enable byte
- * Used by entry.S
- */
-unsigned char __iomem *interrupt_enable;
-
-static void sun4c_mask_irq(struct irq_data *data)
-{
-	unsigned long mask = (unsigned long)data->chip_data;
-
-	if (mask) {
-		unsigned long flags;
-
-		local_irq_save(flags);
-		mask = sbus_readb(interrupt_enable) & ~mask;
-		sbus_writeb(mask, interrupt_enable);
-		local_irq_restore(flags);
-	}
-}
-
-static void sun4c_unmask_irq(struct irq_data *data)
-{
-	unsigned long mask = (unsigned long)data->chip_data;
-
-	if (mask) {
-		unsigned long flags;
-
-		local_irq_save(flags);
-		mask = sbus_readb(interrupt_enable) | mask;
-		sbus_writeb(mask, interrupt_enable);
-		local_irq_restore(flags);
-	}
-}
-
-static unsigned int sun4c_startup_irq(struct irq_data *data)
-{
-	irq_link(data->irq);
-	sun4c_unmask_irq(data);
-
-	return 0;
-}
-
-static void sun4c_shutdown_irq(struct irq_data *data)
-{
-	sun4c_mask_irq(data);
-	irq_unlink(data->irq);
-}
-
-static struct irq_chip sun4c_irq = {
-	.name		= "sun4c",
-	.irq_startup	= sun4c_startup_irq,
-	.irq_shutdown	= sun4c_shutdown_irq,
-	.irq_mask	= sun4c_mask_irq,
-	.irq_unmask	= sun4c_unmask_irq,
-};
-
-static unsigned int sun4c_build_device_irq(struct platform_device *op,
-					   unsigned int real_irq)
-{
-	 unsigned int irq;
-
-	if (real_irq >= 16) {
-		prom_printf("Bogus sun4c IRQ %u\n", real_irq);
-		prom_halt();
-	}
-
-	irq = irq_alloc(real_irq, real_irq);
-	if (irq) {
-		unsigned long mask = 0UL;
-
-		switch (real_irq) {
-		case 1:
-			mask = SUN4C_INT_E1;
-			break;
-		case 8:
-			mask = SUN4C_INT_E8;
-			break;
-		case 10:
-			mask = SUN4C_INT_E10;
-			break;
-		case 14:
-			mask = SUN4C_INT_E14;
-			break;
-		default:
-			/* All the rest are either always enabled,
-			 * or are for signalling software interrupts.
-			 */
-			break;
-		}
-		irq_set_chip_and_handler_name(irq, &sun4c_irq,
-		                              handle_level_irq, "level");
-		irq_set_chip_data(irq, (void *)mask);
-	}
-	return irq;
-}
-
-struct sun4c_timer_info {
-	u32		l10_count;
-	u32		l10_limit;
-	u32		l14_count;
-	u32		l14_limit;
-};
-
-static struct sun4c_timer_info __iomem *sun4c_timers;
-
-static void sun4c_clear_clock_irq(void)
-{
-	sbus_readl(&sun4c_timers->l10_limit);
-}
-
-static void sun4c_load_profile_irq(int cpu, unsigned int limit)
-{
-	/* Errm.. not sure how to do this.. */
-}
-
-static void __init sun4c_init_timers(void)
-{
-	const struct linux_prom_irqs *prom_irqs;
-	struct device_node *dp;
-	unsigned int irq;
-	const u32 *addr;
-	int err;
-
-	dp = of_find_node_by_name(NULL, "counter-timer");
-	if (!dp) {
-		prom_printf("sun4c_init_timers: Unable to find counter-timer\n");
-		prom_halt();
-	}
-
-	addr = of_get_property(dp, "address", NULL);
-	if (!addr) {
-		prom_printf("sun4c_init_timers: No address property\n");
-		prom_halt();
-	}
-
-	sun4c_timers = (void __iomem *) (unsigned long) addr[0];
-
-	prom_irqs = of_get_property(dp, "intr", NULL);
-	of_node_put(dp);
-	if (!prom_irqs) {
-		prom_printf("sun4c_init_timers: No intr property\n");
-		prom_halt();
-	}
-
-	/* Have the level 10 timer tick at 100HZ.  We don't touch the
-	 * level 14 timer limit since we are letting the prom handle
-	 * them until we have a real console driver so L1-A works.
-	 */
-	sparc_config.cs_period = SBUS_CLOCK_RATE / HZ;
-	sparc_config.features |=
-	    FEAT_L10_CLOCKSOURCE | FEAT_L10_CLOCKEVENT;
-	sbus_writel(timer_value(sparc_config.cs_period),
-	            &sun4c_timers->l10_limit);
-
-	master_l10_counter = &sun4c_timers->l10_count;
-
-	irq = sun4c_build_device_irq(NULL, prom_irqs[0].pri);
-	err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
-	if (err) {
-		prom_printf("sun4c_init_timers: request_irq() fails with %d\n", err);
-		prom_halt();
-	}
-
-	/* disable timer interrupt */
-	sun4c_mask_irq(irq_get_irq_data(irq));
-}
-
-#ifdef CONFIG_SMP
-static void sun4c_nop(void)
-{
-}
-#endif
-
-void __init sun4c_init_IRQ(void)
-{
-	struct device_node *dp;
-	const u32 *addr;
-
-	dp = of_find_node_by_name(NULL, "interrupt-enable");
-	if (!dp) {
-		prom_printf("sun4c_init_IRQ: Unable to find interrupt-enable\n");
-		prom_halt();
-	}
-
-	addr = of_get_property(dp, "address", NULL);
-	of_node_put(dp);
-	if (!addr) {
-		prom_printf("sun4c_init_IRQ: No address property\n");
-		prom_halt();
-	}
-
-	interrupt_enable = (void __iomem *) (unsigned long) addr[0];
-
-	BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);
-
-	sparc_config.init_timers      = sun4c_init_timers;
-	sparc_config.build_device_irq = sun4c_build_device_irq;
-	sparc_config.clock_rate       = SBUS_CLOCK_RATE;
-
-#ifdef CONFIG_SMP
-	BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
-	BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
-	BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
-#endif
-	sbus_writeb(SUN4C_INT_ENABLE, interrupt_enable);
-	/* Cannot enable interrupts until OBP ticker is disabled. */
-}
diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile
index 301421c..2e68054 100644
--- a/arch/sparc/mm/Makefile
+++ b/arch/sparc/mm/Makefile
@@ -18,8 +18,4 @@  obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 # Only used by sparc32
 obj-$(CONFIG_HIGHMEM)   += highmem.o
 
-ifdef CONFIG_SMP
 obj-$(CONFIG_SPARC32) += nosun4c.o
-else
-obj-$(CONFIG_SPARC32) += sun4c.o
-endif
diff --git a/arch/sparc/mm/sun4c.c b/arch/sparc/mm/sun4c.c
deleted file mode 100644
index 1cf4f19..0000000
--- a/arch/sparc/mm/sun4c.c
+++ /dev/null
@@ -1,2166 +0,0 @@ 
-/* sun4c.c: Doing in software what should be done in hardware.
- *
- * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
- * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
- * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
- * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
- * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
-
-#define NR_TASK_BUCKETS 512
-
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/bootmem.h>
-#include <linux/highmem.h>
-#include <linux/fs.h>
-#include <linux/seq_file.h>
-#include <linux/scatterlist.h>
-#include <linux/bitmap.h>
-
-#include <asm/sections.h>
-#include <asm/page.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/vaddrs.h>
-#include <asm/idprom.h>
-#include <asm/machines.h>
-#include <asm/memreg.h>
-#include <asm/processor.h>
-#include <asm/auxio.h>
-#include <asm/io.h>
-#include <asm/oplib.h>
-#include <asm/openprom.h>
-#include <asm/mmu_context.h>
-#include <asm/highmem.h>
-#include <asm/btfixup.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-
-/* Because of our dynamic kernel TLB miss strategy, and how
- * our DVMA mapping allocation works, you _MUST_:
- *
- * 1) Disable interrupts _and_ not touch any dynamic kernel
- *    memory while messing with kernel MMU state.  By
- *    dynamic memory I mean any object which is not in
- *    the kernel image itself or a thread_union (both of
- *    which are locked into the MMU).
- * 2) Disable interrupts while messing with user MMU state.
- */
-
-extern int num_segmaps, num_contexts;
-
-extern unsigned long page_kernel;
-
-/* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
- * So let's save some cycles and just use that everywhere except for that bootup
- * sanity check.
- */
-#define SUN4C_VAC_SIZE 65536
-
-#define SUN4C_KERNEL_BUCKETS 32
-
-/* Flushing the cache. */
-struct sun4c_vac_props sun4c_vacinfo;
-unsigned long sun4c_kernel_faults;
-
-/* Invalidate every sun4c cache line tag. */
-static void __init sun4c_flush_all(void)
-{
-	unsigned long begin, end;
-
-	if (sun4c_vacinfo.on)
-		panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
-
-	/* Clear 'valid' bit in all cache line tags */
-	begin = AC_CACHETAGS;
-	end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
-	while (begin < end) {
-		__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
-				     "r" (begin), "i" (ASI_CONTROL));
-		begin += sun4c_vacinfo.linesize;
-	}
-}
-
-static void sun4c_flush_context_hw(void)
-{
-	unsigned long end = SUN4C_VAC_SIZE;
-
-	__asm__ __volatile__(
-		"1:	addcc	%0, -4096, %0\n\t"
-		"	bne	1b\n\t"
-		"	 sta	%%g0, [%0] %2"
-	: "=&r" (end)
-	: "0" (end), "i" (ASI_HWFLUSHCONTEXT)
-	: "cc");
-}
-
-/* Must be called minimally with IRQs disabled. */
-static void sun4c_flush_segment_hw(unsigned long addr)
-{
-	if (sun4c_get_segmap(addr) != invalid_segment) {
-		unsigned long vac_size = SUN4C_VAC_SIZE;
-
-		__asm__ __volatile__(
-			"1:	addcc	%0, -4096, %0\n\t"
-			"	bne	1b\n\t"
-			"	 sta	%%g0, [%2 + %0] %3"
-			: "=&r" (vac_size)
-			: "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
-			: "cc");
-	}
-}
-
-/* File local boot time fixups. */
-BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
-BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
-BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
-
-#define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
-#define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
-#define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
-
-/* Must be called minimally with interrupts disabled. */
-static void sun4c_flush_page_hw(unsigned long addr)
-{
-	addr &= PAGE_MASK;
-	if ((int)sun4c_get_pte(addr) < 0)
-		__asm__ __volatile__("sta %%g0, [%0] %1"
-				     : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
-}
-
-/* Don't inline the software version as it eats too many cache lines if expanded. */
-static void sun4c_flush_context_sw(void)
-{
-	unsigned long nbytes = SUN4C_VAC_SIZE;
-	unsigned long lsize = sun4c_vacinfo.linesize;
-
-	__asm__ __volatile__(
-	"add	%2, %2, %%g1\n\t"
-	"add	%2, %%g1, %%g2\n\t"
-	"add	%2, %%g2, %%g3\n\t"
-	"add	%2, %%g3, %%g4\n\t"
-	"add	%2, %%g4, %%g5\n\t"
-	"add	%2, %%g5, %%o4\n\t"
-	"add	%2, %%o4, %%o5\n"
-	"1:\n\t"
-	"subcc	%0, %%o5, %0\n\t"
-	"sta	%%g0, [%0] %3\n\t"
-	"sta	%%g0, [%0 + %2] %3\n\t"
-	"sta	%%g0, [%0 + %%g1] %3\n\t"
-	"sta	%%g0, [%0 + %%g2] %3\n\t"
-	"sta	%%g0, [%0 + %%g3] %3\n\t"
-	"sta	%%g0, [%0 + %%g4] %3\n\t"
-	"sta	%%g0, [%0 + %%g5] %3\n\t"
-	"bg	1b\n\t"
-	" sta	%%g0, [%1 + %%o4] %3\n"
-	: "=&r" (nbytes)
-	: "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
-	: "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
-}
-
-/* Don't inline the software version as it eats too many cache lines if expanded. */
-static void sun4c_flush_segment_sw(unsigned long addr)
-{
-	if (sun4c_get_segmap(addr) != invalid_segment) {
-		unsigned long nbytes = SUN4C_VAC_SIZE;
-		unsigned long lsize = sun4c_vacinfo.linesize;
-
-		__asm__ __volatile__(
-		"add	%2, %2, %%g1\n\t"
-		"add	%2, %%g1, %%g2\n\t"
-		"add	%2, %%g2, %%g3\n\t"
-		"add	%2, %%g3, %%g4\n\t"
-		"add	%2, %%g4, %%g5\n\t"
-		"add	%2, %%g5, %%o4\n\t"
-		"add	%2, %%o4, %%o5\n"
-		"1:\n\t"
-		"subcc	%1, %%o5, %1\n\t"
-		"sta	%%g0, [%0] %6\n\t"
-		"sta	%%g0, [%0 + %2] %6\n\t"
-		"sta	%%g0, [%0 + %%g1] %6\n\t"
-		"sta	%%g0, [%0 + %%g2] %6\n\t"
-		"sta	%%g0, [%0 + %%g3] %6\n\t"
-		"sta	%%g0, [%0 + %%g4] %6\n\t"
-		"sta	%%g0, [%0 + %%g5] %6\n\t"
-		"sta	%%g0, [%0 + %%o4] %6\n\t"
-		"bg	1b\n\t"
-		" add	%0, %%o5, %0\n"
-		: "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
-		: "0" (addr), "1" (nbytes), "2" (lsize),
-		  "i" (ASI_FLUSHSEG)
-		: "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
-	}
-}
-
-/* Don't inline the software version as it eats too many cache lines if expanded. */
-static void sun4c_flush_page_sw(unsigned long addr)
-{
-	addr &= PAGE_MASK;
-	if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
-	    _SUN4C_PAGE_VALID) {
-		unsigned long left = PAGE_SIZE;
-		unsigned long lsize = sun4c_vacinfo.linesize;
-
-		__asm__ __volatile__(
-		"add	%2, %2, %%g1\n\t"
-		"add	%2, %%g1, %%g2\n\t"
-		"add	%2, %%g2, %%g3\n\t"
-		"add	%2, %%g3, %%g4\n\t"
-		"add	%2, %%g4, %%g5\n\t"
-		"add	%2, %%g5, %%o4\n\t"
-		"add	%2, %%o4, %%o5\n"
-		"1:\n\t"
-		"subcc	%1, %%o5, %1\n\t"
-		"sta	%%g0, [%0] %6\n\t"
-		"sta	%%g0, [%0 + %2] %6\n\t"
-		"sta	%%g0, [%0 + %%g1] %6\n\t"
-		"sta	%%g0, [%0 + %%g2] %6\n\t"
-		"sta	%%g0, [%0 + %%g3] %6\n\t"
-		"sta	%%g0, [%0 + %%g4] %6\n\t"
-		"sta	%%g0, [%0 + %%g5] %6\n\t"
-		"sta	%%g0, [%0 + %%o4] %6\n\t"
-		"bg	1b\n\t"
-		" add	%0, %%o5, %0\n"
-		: "=&r" (addr), "=&r" (left), "=&r" (lsize)
-		: "0" (addr), "1" (left), "2" (lsize),
-		  "i" (ASI_FLUSHPG)
-		: "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
-	}
-}
-
-/* The sun4c's do have an on chip store buffer.  And the way you
- * clear them out isn't so obvious.  The only way I can think of
- * to accomplish this is to read the current context register,
- * store the same value there, then read an external hardware
- * register.
- */
-void sun4c_complete_all_stores(void)
-{
-	volatile int _unused;
-
-	_unused = sun4c_get_context();
-	sun4c_set_context(_unused);
-	_unused = get_auxio();
-}
-
-/* Bootup utility functions. */
-static inline void sun4c_init_clean_segmap(unsigned char pseg)
-{
-	unsigned long vaddr;
-
-	sun4c_put_segmap(0, pseg);
-	for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
-		sun4c_put_pte(vaddr, 0);
-	sun4c_put_segmap(0, invalid_segment);
-}
-
-static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
-{
-	unsigned long vaddr;
-	unsigned char savectx, ctx;
-
-	savectx = sun4c_get_context();
-	for (ctx = 0; ctx < num_contexts; ctx++) {
-		sun4c_set_context(ctx);
-		for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
-			sun4c_put_segmap(vaddr, invalid_segment);
-		for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
-			sun4c_put_segmap(vaddr, invalid_segment);
-		for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
-			sun4c_put_segmap(vaddr, invalid_segment);
-		for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
-			sun4c_put_segmap(vaddr, invalid_segment);
-	}
-	sun4c_set_context(savectx);
-}
-
-void __init sun4c_probe_vac(void)
-{
-	sun4c_disable_vac();
-
-	if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
-	    (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
-		/* PROM on SS1 lacks this info, to be super safe we
-		 * hard code it here since this arch is cast in stone.
-		 */
-		sun4c_vacinfo.num_bytes = 65536;
-		sun4c_vacinfo.linesize = 16;
-	} else {
-		sun4c_vacinfo.num_bytes =
-		 prom_getintdefault(prom_root_node, "vac-size", 65536);
-		sun4c_vacinfo.linesize =
-		 prom_getintdefault(prom_root_node, "vac-linesize", 16);
-	}
-	sun4c_vacinfo.do_hwflushes =
-	 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
-
-	if (sun4c_vacinfo.do_hwflushes == 0)
-		sun4c_vacinfo.do_hwflushes =
-		 prom_getintdefault(prom_root_node, "vac_hwflush", 0);
-
-	if (sun4c_vacinfo.num_bytes != 65536) {
-		prom_printf("WEIRD Sun4C VAC cache size, "
-			    "tell sparclinux@vger.kernel.org");
-		prom_halt();
-	}
-
-	switch (sun4c_vacinfo.linesize) {
-	case 16:
-		sun4c_vacinfo.log2lsize = 4;
-		break;
-	case 32:
-		sun4c_vacinfo.log2lsize = 5;
-		break;
-	default:
-		prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
-			    sun4c_vacinfo.linesize);
-		prom_halt();
-	}
-
-	sun4c_flush_all();
-	sun4c_enable_vac();
-}
-
-/* Patch instructions for the low level kernel fault handler. */
-extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
-extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
-extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
-extern unsigned long num_context_patch1, num_context_patch1_16;
-extern unsigned long num_context_patch2_16;
-extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
-extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
-extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
-
-#define PATCH_INSN(src, dst) do {	\
-		daddr = &(dst);		\
-		iaddr = &(src);		\
-		*daddr = *iaddr;	\
-	} while (0)
-
-static void __init patch_kernel_fault_handler(void)
-{
-	unsigned long *iaddr, *daddr;
-
-	switch (num_segmaps) {
-		case 128:
-			/* Default, nothing to do. */
-			break;
-		case 256:
-			PATCH_INSN(invalid_segment_patch1_ff,
-				   invalid_segment_patch1);
-			PATCH_INSN(invalid_segment_patch2_ff,
-				   invalid_segment_patch2);
-			break;
-		case 512:
-			PATCH_INSN(invalid_segment_patch1_1ff,
-				   invalid_segment_patch1);
-			PATCH_INSN(invalid_segment_patch2_1ff,
-				   invalid_segment_patch2);
-			break;
-		default:
-			prom_printf("Unhandled number of segmaps: %d\n",
-				    num_segmaps);
-			prom_halt();
-	}
-	switch (num_contexts) {
-		case 8:
-			/* Default, nothing to do. */
-			break;
-		case 16:
-			PATCH_INSN(num_context_patch1_16,
-				   num_context_patch1);
-			break;
-		default:
-			prom_printf("Unhandled number of contexts: %d\n",
-				    num_contexts);
-			prom_halt();
-	}
-
-	if (sun4c_vacinfo.do_hwflushes != 0) {
-		PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
-		PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
-	} else {
-		switch (sun4c_vacinfo.linesize) {
-		case 16:
-			/* Default, nothing to do. */
-			break;
-		case 32:
-			PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
-			break;
-		default:
-			prom_printf("Impossible VAC linesize %d, halting...\n",
-				    sun4c_vacinfo.linesize);
-			prom_halt();
-		}
-	}
-}
-
-static void __init sun4c_probe_mmu(void)
-{
-	if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
-	    (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
-		/* Hardcode these just to be safe, PROM on SS1 does
-		* not have this info available in the root node.
-		*/
-		num_segmaps = 128;
-		num_contexts = 8;
-	} else {
-		num_segmaps =
-		    prom_getintdefault(prom_root_node, "mmu-npmg", 128);
-		num_contexts =
-		    prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
-	}
-	patch_kernel_fault_handler();
-}
-
-volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
-
-void __init sun4c_probe_memerr_reg(void)
-{
-	phandle node;
-	struct linux_prom_registers regs[1];
-
-	node = prom_getchild(prom_root_node);
-	node = prom_searchsiblings(prom_root_node, "memory-error");
-	if (!node)
-		return;
-	if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
-		return;
-	/* hmm I think regs[0].which_io is zero here anyways */
-	sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
-}
-
-static inline void sun4c_init_ss2_cache_bug(void)
-{
-	if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
-	    (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
-	    (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
-		/* Whee.. */
-		printk("SS2 cache bug detected, uncaching trap table page\n");
-		sun4c_flush_page((unsigned int) &_start);
-		sun4c_put_pte(((unsigned long) &_start),
-			(sun4c_get_pte((unsigned long) &_start) | _SUN4C_PAGE_NOCACHE));
-	}
-}
-
-/* Addr is always aligned on a page boundary for us already. */
-static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va,
-			      unsigned long addr, int len)
-{
-	unsigned long page, end;
-
-	*pba = addr;
-
-	end = PAGE_ALIGN((addr + len));
-	while (addr < end) {
-		page = va;
-		sun4c_flush_page(page);
-		page -= PAGE_OFFSET;
-		page >>= PAGE_SHIFT;
-		page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
-			 _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
-		sun4c_put_pte(addr, page);
-		addr += PAGE_SIZE;
-		va += PAGE_SIZE;
-	}
-
-	return 0;
-}
-
-static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len)
-{
-	/* Fortunately for us, bus_addr == uncached_virt in sun4c. */
-	/* XXX Implement this */
-}
-
-/* TLB management. */
-
-/* Don't change this struct without changing entry.S. This is used
- * in the in-window kernel fault handler, and you don't want to mess
- * with that. (See sun4c_fault in entry.S).
- */
-struct sun4c_mmu_entry {
-	struct sun4c_mmu_entry *next;
-	struct sun4c_mmu_entry *prev;
-	unsigned long vaddr;
-	unsigned char pseg;
-	unsigned char locked;
-
-	/* For user mappings only, and completely hidden from kernel
-	 * TLB miss code.
-	 */
-	unsigned char ctx;
-	struct sun4c_mmu_entry *lru_next;
-	struct sun4c_mmu_entry *lru_prev;
-};
-
-static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
-
-static void __init sun4c_init_mmu_entry_pool(void)
-{
-	int i;
-
-	for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
-		mmu_entry_pool[i].pseg = i;
-		mmu_entry_pool[i].next = NULL;
-		mmu_entry_pool[i].prev = NULL;
-		mmu_entry_pool[i].vaddr = 0;
-		mmu_entry_pool[i].locked = 0;
-		mmu_entry_pool[i].ctx = 0;
-		mmu_entry_pool[i].lru_next = NULL;
-		mmu_entry_pool[i].lru_prev = NULL;
-	}
-	mmu_entry_pool[invalid_segment].locked = 1;
-}
-
-static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
-				   unsigned long bits_off)
-{
-	unsigned long start, end;
-
-	end = vaddr + SUN4C_REAL_PGDIR_SIZE;
-	for (start = vaddr; start < end; start += PAGE_SIZE)
-		if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
-			sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
-				      ~bits_off);
-}
-
-static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
-{
-	unsigned long vaddr;
-	unsigned char pseg, ctx;
-
-	for (vaddr = KADB_DEBUGGER_BEGVM;
-	     vaddr < LINUX_OPPROM_ENDVM;
-	     vaddr += SUN4C_REAL_PGDIR_SIZE) {
-		pseg = sun4c_get_segmap(vaddr);
-		if (pseg != invalid_segment) {
-			mmu_entry_pool[pseg].locked = 1;
-			for (ctx = 0; ctx < num_contexts; ctx++)
-				prom_putsegment(ctx, vaddr, pseg);
-			fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
-		}
-	}
-
-	for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
-		pseg = sun4c_get_segmap(vaddr);
-		mmu_entry_pool[pseg].locked = 1;
-		for (ctx = 0; ctx < num_contexts; ctx++)
-			prom_putsegment(ctx, vaddr, pseg);
-		fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
-	}
-}
-
-static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
-{
-	int i, ctx;
-
-	while (start < end) {
-		for (i = 0; i < invalid_segment; i++)
-			if (!mmu_entry_pool[i].locked)
-				break;
-		mmu_entry_pool[i].locked = 1;
-		sun4c_init_clean_segmap(i);
-		for (ctx = 0; ctx < num_contexts; ctx++)
-			prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
-		start += SUN4C_REAL_PGDIR_SIZE;
-	}
-}
-
-/* Don't change this struct without changing entry.S. This is used
- * in the in-window kernel fault handler, and you don't want to mess
- * with that. (See sun4c_fault in entry.S).
- */
-struct sun4c_mmu_ring {
-	struct sun4c_mmu_entry ringhd;
-	int num_entries;
-};
-
-static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
-static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
-static struct sun4c_mmu_ring sun4c_ulru_ring;	     /* LRU user entries */
-struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
-struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
-
-static inline void sun4c_init_rings(void)
-{
-	int i;
-
-	for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
-		sun4c_context_ring[i].ringhd.next =
-			sun4c_context_ring[i].ringhd.prev =
-			&sun4c_context_ring[i].ringhd;
-		sun4c_context_ring[i].num_entries = 0;
-	}
-	sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
-		&sun4c_ufree_ring.ringhd;
-	sun4c_ufree_ring.num_entries = 0;
-	sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
-		&sun4c_ulru_ring.ringhd;
-	sun4c_ulru_ring.num_entries = 0;
-	sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
-		&sun4c_kernel_ring.ringhd;
-	sun4c_kernel_ring.num_entries = 0;
-	sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
-		&sun4c_kfree_ring.ringhd;
-	sun4c_kfree_ring.num_entries = 0;
-}
-
-static void add_ring(struct sun4c_mmu_ring *ring,
-		     struct sun4c_mmu_entry *entry)
-{
-	struct sun4c_mmu_entry *head = &ring->ringhd;
-
-	entry->prev = head;
-	(entry->next = head->next)->prev = entry;
-	head->next = entry;
-	ring->num_entries++;
-}
-
-static inline void add_lru(struct sun4c_mmu_entry *entry)
-{
-	struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
-	struct sun4c_mmu_entry *head = &ring->ringhd;
-
-	entry->lru_next = head;
-	(entry->lru_prev = head->lru_prev)->lru_next = entry;
-	head->lru_prev = entry;
-}
-
-static void add_ring_ordered(struct sun4c_mmu_ring *ring,
-			     struct sun4c_mmu_entry *entry)
-{
-	struct sun4c_mmu_entry *head = &ring->ringhd;
-	unsigned long addr = entry->vaddr;
-
-	while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
-		head = head->next;
-
-	entry->prev = head;
-	(entry->next = head->next)->prev = entry;
-	head->next = entry;
-	ring->num_entries++;
-
-	add_lru(entry);
-}
-
-static inline void remove_ring(struct sun4c_mmu_ring *ring,
-				   struct sun4c_mmu_entry *entry)
-{
-	struct sun4c_mmu_entry *next = entry->next;
-
-	(next->prev = entry->prev)->next = next;
-	ring->num_entries--;
-}
-
-static void remove_lru(struct sun4c_mmu_entry *entry)
-{
-	struct sun4c_mmu_entry *next = entry->lru_next;
-
-	(next->lru_prev = entry->lru_prev)->lru_next = next;
-}
-
-static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
-{
-        remove_ring(sun4c_context_ring+ctx, entry);
-	remove_lru(entry);
-        add_ring(&sun4c_ufree_ring, entry);
-}
-
-static void free_kernel_entry(struct sun4c_mmu_entry *entry,
-			      struct sun4c_mmu_ring *ring)
-{
-        remove_ring(ring, entry);
-        add_ring(&sun4c_kfree_ring, entry);
-}
-
-static void __init sun4c_init_fill_kernel_ring(int howmany)
-{
-	int i;
-
-	while (howmany) {
-		for (i = 0; i < invalid_segment; i++)
-			if (!mmu_entry_pool[i].locked)
-				break;
-		mmu_entry_pool[i].locked = 1;
-		sun4c_init_clean_segmap(i);
-		add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
-		howmany--;
-	}
-}
-
-static void __init sun4c_init_fill_user_ring(void)
-{
-	int i;
-
-	for (i = 0; i < invalid_segment; i++) {
-		if (mmu_entry_pool[i].locked)
-			continue;
-		sun4c_init_clean_segmap(i);
-		add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
-	}
-}
-
-static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
-{
-	int savectx, ctx;
-
-	savectx = sun4c_get_context();
-	for (ctx = 0; ctx < num_contexts; ctx++) {
-		sun4c_set_context(ctx);
-		sun4c_put_segmap(kentry->vaddr, invalid_segment);
-	}
-	sun4c_set_context(savectx);
-}
-
-static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
-{
-	int savectx, ctx;
-
-	savectx = sun4c_get_context();
-	for (ctx = 0; ctx < num_contexts; ctx++) {
-		sun4c_set_context(ctx);
-		sun4c_put_segmap(kentry->vaddr, kentry->pseg);
-	}
-	sun4c_set_context(savectx);
-}
-
-#define sun4c_user_unmap(__entry) \
-	sun4c_put_segmap((__entry)->vaddr, invalid_segment)
-
-static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
-{
-	struct sun4c_mmu_entry *head = &crp->ringhd;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	if (head->next != head) {
-		struct sun4c_mmu_entry *entry = head->next;
-		int savectx = sun4c_get_context();
-
-		flush_user_windows();
-		sun4c_set_context(ctx);
-		sun4c_flush_context();
-		do {
-			struct sun4c_mmu_entry *next = entry->next;
-
-			sun4c_user_unmap(entry);
-			free_user_entry(ctx, entry);
-
-			entry = next;
-		} while (entry != head);
-		sun4c_set_context(savectx);
-	}
-	local_irq_restore(flags);
-}
-
-static int sun4c_user_taken_entries;  /* This is how much we have.             */
-static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
-
-static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
-{
-	struct sun4c_mmu_entry *this_entry;
-
-	/* If some are free, return first one. */
-	if (sun4c_kfree_ring.num_entries) {
-		this_entry = sun4c_kfree_ring.ringhd.next;
-		return this_entry;
-	}
-
-	/* Else free one up. */
-	this_entry = sun4c_kernel_ring.ringhd.prev;
-	sun4c_flush_segment(this_entry->vaddr);
-	sun4c_kernel_unmap(this_entry);
-	free_kernel_entry(this_entry, &sun4c_kernel_ring);
-	this_entry = sun4c_kfree_ring.ringhd.next;
-
-	return this_entry;
-}
-
-/* Using this method to free up mmu entries eliminates a lot of
- * potential races since we have a kernel that incurs tlb
- * replacement faults.  There may be performance penalties.
- *
- * NOTE: Must be called with interrupts disabled.
- */
-static struct sun4c_mmu_entry *sun4c_user_strategy(void)
-{
-	struct sun4c_mmu_entry *entry;
-	unsigned char ctx;
-	int savectx;
-
-	/* If some are free, return first one. */
-	if (sun4c_ufree_ring.num_entries) {
-		entry = sun4c_ufree_ring.ringhd.next;
-		goto unlink_out;
-	}
-
-	if (sun4c_user_taken_entries) {
-		entry = sun4c_kernel_strategy();
-		sun4c_user_taken_entries--;
-		goto kunlink_out;
-	}
-
-	/* Grab from the beginning of the LRU list. */
-	entry = sun4c_ulru_ring.ringhd.lru_next;
-	ctx = entry->ctx;
-
-	savectx = sun4c_get_context();
-	flush_user_windows();
-	sun4c_set_context(ctx);
-	sun4c_flush_segment(entry->vaddr);
-	sun4c_user_unmap(entry);
-	remove_ring(sun4c_context_ring + ctx, entry);
-	remove_lru(entry);
-	sun4c_set_context(savectx);
-
-	return entry;
-
-unlink_out:
-	remove_ring(&sun4c_ufree_ring, entry);
-	return entry;
-kunlink_out:
-	remove_ring(&sun4c_kfree_ring, entry);
-	return entry;
-}
-
-/* NOTE: Must be called with interrupts disabled. */
-void sun4c_grow_kernel_ring(void)
-{
-	struct sun4c_mmu_entry *entry;
-
-	/* Prevent deadlock condition. */
-	if (sun4c_user_taken_entries >= max_user_taken_entries)
-		return;
-
-	if (sun4c_ufree_ring.num_entries) {
-		entry = sun4c_ufree_ring.ringhd.next;
-        	remove_ring(&sun4c_ufree_ring, entry);
-		add_ring(&sun4c_kfree_ring, entry);
-		sun4c_user_taken_entries++;
-	}
-}
-
-/* 2 page buckets for task struct and kernel stack allocation.
- *
- * TASK_STACK_BEGIN
- * bucket[0]
- * bucket[1]
- *   [ ... ]
- * bucket[NR_TASK_BUCKETS-1]
- * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
- *
- * Each slot looks like:
- *
- *  page 1 --  task struct + beginning of kernel stack
- *  page 2 --  rest of kernel stack
- */
-
-union task_union *sun4c_bucket[NR_TASK_BUCKETS];
-
-static int sun4c_lowbucket_avail;
-
-#define BUCKET_EMPTY     ((union task_union *) 0)
-#define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
-#define BUCKET_SIZE      (1 << BUCKET_SHIFT)
-#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
-#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
-#define BUCKET_PTE(page)       \
-        ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
-#define BUCKET_PTE_PAGE(pte)   \
-        (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
-
-static void get_locked_segment(unsigned long addr)
-{
-	struct sun4c_mmu_entry *stolen;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	addr &= SUN4C_REAL_PGDIR_MASK;
-	stolen = sun4c_user_strategy();
-	max_user_taken_entries--;
-	stolen->vaddr = addr;
-	flush_user_windows();
-	sun4c_kernel_map(stolen);
-	local_irq_restore(flags);
-}
-
-static void free_locked_segment(unsigned long addr)
-{
-	struct sun4c_mmu_entry *entry;
-	unsigned long flags;
-	unsigned char pseg;
-
-	local_irq_save(flags);
-	addr &= SUN4C_REAL_PGDIR_MASK;
-	pseg = sun4c_get_segmap(addr);
-	entry = &mmu_entry_pool[pseg];
-
-	flush_user_windows();
-	sun4c_flush_segment(addr);
-	sun4c_kernel_unmap(entry);
-	add_ring(&sun4c_ufree_ring, entry);
-	max_user_taken_entries++;
-	local_irq_restore(flags);
-}
-
-static inline void garbage_collect(int entry)
-{
-	int start, end;
-
-	/* 32 buckets per segment... */
-	entry &= ~31;
-	start = entry;
-	for (end = (start + 32); start < end; start++)
-		if (sun4c_bucket[start] != BUCKET_EMPTY)
-			return;
-
-	/* Entire segment empty, release it. */
-	free_locked_segment(BUCKET_ADDR(entry));
-}
-
-static struct thread_info *sun4c_alloc_thread_info_node(int node)
-{
-	unsigned long addr, pages;
-	int entry;
-
-	pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
-	if (!pages)
-		return NULL;
-
-	for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
-		if (sun4c_bucket[entry] == BUCKET_EMPTY)
-			break;
-	if (entry == NR_TASK_BUCKETS) {
-		free_pages(pages, THREAD_INFO_ORDER);
-		return NULL;
-	}
-	if (entry >= sun4c_lowbucket_avail)
-		sun4c_lowbucket_avail = entry + 1;
-
-	addr = BUCKET_ADDR(entry);
-	sun4c_bucket[entry] = (union task_union *) addr;
-	if(sun4c_get_segmap(addr) == invalid_segment)
-		get_locked_segment(addr);
-
-	/* We are changing the virtual color of the page(s)
-	 * so we must flush the cache to guarantee consistency.
-	 */
-	sun4c_flush_page(pages);
-	sun4c_flush_page(pages + PAGE_SIZE);
-
-	sun4c_put_pte(addr, BUCKET_PTE(pages));
-	sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
-
-#ifdef CONFIG_DEBUG_STACK_USAGE
-	memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
-#endif /* DEBUG_STACK_USAGE */
-
-	return (struct thread_info *) addr;
-}
-
-static void sun4c_free_thread_info(struct thread_info *ti)
-{
-	unsigned long tiaddr = (unsigned long) ti;
-	unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
-	int entry = BUCKET_NUM(tiaddr);
-
-	/* We are deleting a mapping, so the flush here is mandatory. */
-	sun4c_flush_page(tiaddr);
-	sun4c_flush_page(tiaddr + PAGE_SIZE);
-
-	sun4c_put_pte(tiaddr, 0);
-	sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
-
-	sun4c_bucket[entry] = BUCKET_EMPTY;
-	if (entry < sun4c_lowbucket_avail)
-		sun4c_lowbucket_avail = entry;
-
-	free_pages(pages, THREAD_INFO_ORDER);
-	garbage_collect(entry);
-}
-
-static void __init sun4c_init_buckets(void)
-{
-	int entry;
-
-	if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
-		extern void thread_info_size_is_bolixed_pete(void);
-		thread_info_size_is_bolixed_pete();
-	}
-
-	for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
-		sun4c_bucket[entry] = BUCKET_EMPTY;
-	sun4c_lowbucket_avail = 0;
-}
-
-static unsigned long sun4c_iobuffer_start;
-static unsigned long sun4c_iobuffer_end;
-static unsigned long sun4c_iobuffer_high;
-static unsigned long *sun4c_iobuffer_map;
-static int iobuffer_map_size;
-
-/*
- * Alias our pages so they do not cause a trap.
- * Also one page may be aliased into several I/O areas and we may
- * finish these I/O separately.
- */
-static char *sun4c_lockarea(char *vaddr, unsigned long size)
-{
-	unsigned long base, scan;
-	unsigned long npages;
-	unsigned long vpage;
-	unsigned long pte;
-	unsigned long apage;
-	unsigned long high;
-	unsigned long flags;
-
-	npages = (((unsigned long)vaddr & ~PAGE_MASK) +
-		  size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
-
-	local_irq_save(flags);
-	base = bitmap_find_next_zero_area(sun4c_iobuffer_map, iobuffer_map_size,
-						0, npages, 0);
-	if (base >= iobuffer_map_size)
-		goto abend;
-
-	high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
-	high = SUN4C_REAL_PGDIR_ALIGN(high);
-	while (high > sun4c_iobuffer_high) {
-		get_locked_segment(sun4c_iobuffer_high);
-		sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
-	}
-
-	vpage = ((unsigned long) vaddr) & PAGE_MASK;
-	for (scan = base; scan < base+npages; scan++) {
-		pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
- 		pte |= pgprot_val(SUN4C_PAGE_KERNEL);
-		pte |= _SUN4C_PAGE_NOCACHE;
-		set_bit(scan, sun4c_iobuffer_map);
-		apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
-
-		/* Flush original mapping so we see the right things later. */
-		sun4c_flush_page(vpage);
-
-		sun4c_put_pte(apage, pte);
-		vpage += PAGE_SIZE;
-	}
-	local_irq_restore(flags);
-	return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
-			 (((unsigned long) vaddr) & ~PAGE_MASK));
-
-abend:
-	local_irq_restore(flags);
-	printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
-	panic("Out of iobuffer table");
-	return NULL;
-}
-
-static void sun4c_unlockarea(char *vaddr, unsigned long size)
-{
-	unsigned long vpage, npages;
-	unsigned long flags;
-	int scan, high;
-
-	vpage = (unsigned long)vaddr & PAGE_MASK;
-	npages = (((unsigned long)vaddr & ~PAGE_MASK) +
-		  size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
-
-	local_irq_save(flags);
-	while (npages != 0) {
-		--npages;
-
-		/* This mapping is marked non-cachable, no flush necessary. */
-		sun4c_put_pte(vpage, 0);
-		clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
-			  sun4c_iobuffer_map);
-		vpage += PAGE_SIZE;
-	}
-
-	/* garbage collect */
-	scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
-	while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
-		scan -= 32;
-	scan += 32;
-	high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
-	high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
-	while (high < sun4c_iobuffer_high) {
-		sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
-		free_locked_segment(sun4c_iobuffer_high);
-	}
-	local_irq_restore(flags);
-}
-
-/* Note the scsi code at init time passes to here buffers
- * which sit on the kernel stack, those are already locked
- * by implication and fool the page locking code above
- * if passed to by mistake.
- */
-static __u32 sun4c_get_scsi_one(struct device *dev, char *bufptr, unsigned long len)
-{
-	unsigned long page;
-
-	page = ((unsigned long)bufptr) & PAGE_MASK;
-	if (!virt_addr_valid(page)) {
-		sun4c_flush_page(page);
-		return (__u32)bufptr; /* already locked */
-	}
-	return (__u32)sun4c_lockarea(bufptr, len);
-}
-
-static void sun4c_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
-{
-	while (sz != 0) {
-		--sz;
-		sg->dma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
-		sg->dma_length = sg->length;
-		sg = sg_next(sg);
-	}
-}
-
-static void sun4c_release_scsi_one(struct device *dev, __u32 bufptr, unsigned long len)
-{
-	if (bufptr < sun4c_iobuffer_start)
-		return; /* On kernel stack or similar, see above */
-	sun4c_unlockarea((char *)bufptr, len);
-}
-
-static void sun4c_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
-{
-	while (sz != 0) {
-		--sz;
-		sun4c_unlockarea((char *)sg->dma_address, sg->length);
-		sg = sg_next(sg);
-	}
-}
-
-#define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
-#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
-
-struct vm_area_struct sun4c_kstack_vma;
-
-static void __init sun4c_init_lock_areas(void)
-{
-	unsigned long sun4c_taskstack_start;
-	unsigned long sun4c_taskstack_end;
-	int bitmap_size;
-
-	sun4c_init_buckets();
-	sun4c_taskstack_start = SUN4C_LOCK_VADDR;
-	sun4c_taskstack_end = (sun4c_taskstack_start +
-			       (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
-	if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
-		prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
-		prom_halt();
-	}
-
-	sun4c_iobuffer_start = sun4c_iobuffer_high =
-				SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
-	sun4c_iobuffer_end = SUN4C_LOCK_END;
-	bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
-	bitmap_size = (bitmap_size + 7) >> 3;
-	bitmap_size = LONG_ALIGN(bitmap_size);
-	iobuffer_map_size = bitmap_size << 3;
-	sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
-	memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
-
-	sun4c_kstack_vma.vm_mm = &init_mm;
-	sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
-	sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
-	sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
-	sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
-	insert_vm_struct(&init_mm, &sun4c_kstack_vma);
-}
-
-/* Cache flushing on the sun4c. */
-static void sun4c_flush_cache_all(void)
-{
-	unsigned long begin, end;
-
-	flush_user_windows();
-	begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
-	end = (begin + SUN4C_VAC_SIZE);
-
-	if (sun4c_vacinfo.linesize == 32) {
-		while (begin < end) {
-			__asm__ __volatile__(
-			"ld	[%0 + 0x00], %%g0\n\t"
-			"ld	[%0 + 0x20], %%g0\n\t"
-			"ld	[%0 + 0x40], %%g0\n\t"
-			"ld	[%0 + 0x60], %%g0\n\t"
-			"ld	[%0 + 0x80], %%g0\n\t"
-			"ld	[%0 + 0xa0], %%g0\n\t"
-			"ld	[%0 + 0xc0], %%g0\n\t"
-			"ld	[%0 + 0xe0], %%g0\n\t"
-			"ld	[%0 + 0x100], %%g0\n\t"
-			"ld	[%0 + 0x120], %%g0\n\t"
-			"ld	[%0 + 0x140], %%g0\n\t"
-			"ld	[%0 + 0x160], %%g0\n\t"
-			"ld	[%0 + 0x180], %%g0\n\t"
-			"ld	[%0 + 0x1a0], %%g0\n\t"
-			"ld	[%0 + 0x1c0], %%g0\n\t"
-			"ld	[%0 + 0x1e0], %%g0\n"
-			: : "r" (begin));
-			begin += 512;
-		}
-	} else {
-		while (begin < end) {
-			__asm__ __volatile__(
-			"ld	[%0 + 0x00], %%g0\n\t"
-			"ld	[%0 + 0x10], %%g0\n\t"
-			"ld	[%0 + 0x20], %%g0\n\t"
-			"ld	[%0 + 0x30], %%g0\n\t"
-			"ld	[%0 + 0x40], %%g0\n\t"
-			"ld	[%0 + 0x50], %%g0\n\t"
-			"ld	[%0 + 0x60], %%g0\n\t"
-			"ld	[%0 + 0x70], %%g0\n\t"
-			"ld	[%0 + 0x80], %%g0\n\t"
-			"ld	[%0 + 0x90], %%g0\n\t"
-			"ld	[%0 + 0xa0], %%g0\n\t"
-			"ld	[%0 + 0xb0], %%g0\n\t"
-			"ld	[%0 + 0xc0], %%g0\n\t"
-			"ld	[%0 + 0xd0], %%g0\n\t"
-			"ld	[%0 + 0xe0], %%g0\n\t"
-			"ld	[%0 + 0xf0], %%g0\n"
-			: : "r" (begin));
-			begin += 256;
-		}
-	}
-}
-
-static void sun4c_flush_cache_mm(struct mm_struct *mm)
-{
-	int new_ctx = mm->context;
-
-	if (new_ctx != NO_CONTEXT) {
-		flush_user_windows();
-
-		if (sun4c_context_ring[new_ctx].num_entries) {
-			struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
-			unsigned long flags;
-
-			local_irq_save(flags);
-			if (head->next != head) {
-				struct sun4c_mmu_entry *entry = head->next;
-				int savectx = sun4c_get_context();
-
-				sun4c_set_context(new_ctx);
-				sun4c_flush_context();
-				do {
-					struct sun4c_mmu_entry *next = entry->next;
-
-					sun4c_user_unmap(entry);
-					free_user_entry(new_ctx, entry);
-
-					entry = next;
-				} while (entry != head);
-				sun4c_set_context(savectx);
-			}
-			local_irq_restore(flags);
-		}
-	}
-}
-
-static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	int new_ctx = mm->context;
-
-	if (new_ctx != NO_CONTEXT) {
-		struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
-		struct sun4c_mmu_entry *entry;
-		unsigned long flags;
-
-		flush_user_windows();
-
-		local_irq_save(flags);
-		/* All user segmap chains are ordered on entry->vaddr. */
-		for (entry = head->next;
-		     (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
-		     entry = entry->next)
-			;
-
-		/* Tracing various job mixtures showed that this conditional
-		 * only passes ~35% of the time for most worse case situations,
-		 * therefore we avoid all of this gross overhead ~65% of the time.
-		 */
-		if ((entry != head) && (entry->vaddr < end)) {
-			int octx = sun4c_get_context();
-			sun4c_set_context(new_ctx);
-
-			/* At this point, always, (start >= entry->vaddr) and
-			 * (entry->vaddr < end), once the latter condition
-			 * ceases to hold, or we hit the end of the list, we
-			 * exit the loop.  The ordering of all user allocated
-			 * segmaps makes this all work out so beautifully.
-			 */
-			do {
-				struct sun4c_mmu_entry *next = entry->next;
-				unsigned long realend;
-
-				/* "realstart" is always >= entry->vaddr */
-				realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
-				if (end < realend)
-					realend = end;
-				if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
-					unsigned long page = entry->vaddr;
-					while (page < realend) {
-						sun4c_flush_page(page);
-						page += PAGE_SIZE;
-					}
-				} else {
-					sun4c_flush_segment(entry->vaddr);
-					sun4c_user_unmap(entry);
-					free_user_entry(new_ctx, entry);
-				}
-				entry = next;
-			} while ((entry != head) && (entry->vaddr < end));
-			sun4c_set_context(octx);
-		}
-		local_irq_restore(flags);
-	}
-}
-
-static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	int new_ctx = mm->context;
-
-	/* Sun4c has no separate I/D caches so cannot optimize for non
-	 * text page flushes.
-	 */
-	if (new_ctx != NO_CONTEXT) {
-		int octx = sun4c_get_context();
-		unsigned long flags;
-
-		flush_user_windows();
-		local_irq_save(flags);
-		sun4c_set_context(new_ctx);
-		sun4c_flush_page(page);
-		sun4c_set_context(octx);
-		local_irq_restore(flags);
-	}
-}
-
-static void sun4c_flush_page_to_ram(unsigned long page)
-{
-	unsigned long flags;
-
-	local_irq_save(flags);
-	sun4c_flush_page(page);
-	local_irq_restore(flags);
-}
-
-/* Sun4c cache is unified, both instructions and data live there, so
- * no need to flush the on-stack instructions for new signal handlers.
- */
-static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
-{
-}
-
-/* TLB flushing on the sun4c.  These routines count on the cache
- * flushing code to flush the user register windows so that we need
- * not do so when we get here.
- */
-
-static void sun4c_flush_tlb_all(void)
-{
-	struct sun4c_mmu_entry *this_entry, *next_entry;
-	unsigned long flags;
-	int savectx, ctx;
-
-	local_irq_save(flags);
-	this_entry = sun4c_kernel_ring.ringhd.next;
-	savectx = sun4c_get_context();
-	flush_user_windows();
-	while (sun4c_kernel_ring.num_entries) {
-		next_entry = this_entry->next;
-		sun4c_flush_segment(this_entry->vaddr);
-		for (ctx = 0; ctx < num_contexts; ctx++) {
-			sun4c_set_context(ctx);
-			sun4c_put_segmap(this_entry->vaddr, invalid_segment);
-		}
-		free_kernel_entry(this_entry, &sun4c_kernel_ring);
-		this_entry = next_entry;
-	}
-	sun4c_set_context(savectx);
-	local_irq_restore(flags);
-}
-
-static void sun4c_flush_tlb_mm(struct mm_struct *mm)
-{
-	int new_ctx = mm->context;
-
-	if (new_ctx != NO_CONTEXT) {
-		struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
-		unsigned long flags;
-
-		local_irq_save(flags);
-		if (head->next != head) {
-			struct sun4c_mmu_entry *entry = head->next;
-			int savectx = sun4c_get_context();
-
-			sun4c_set_context(new_ctx);
-			sun4c_flush_context();
-			do {
-				struct sun4c_mmu_entry *next = entry->next;
-
-				sun4c_user_unmap(entry);
-				free_user_entry(new_ctx, entry);
-
-				entry = next;
-			} while (entry != head);
-			sun4c_set_context(savectx);
-		}
-		local_irq_restore(flags);
-	}
-}
-
-static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	int new_ctx = mm->context;
-
-	if (new_ctx != NO_CONTEXT) {
-		struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
-		struct sun4c_mmu_entry *entry;
-		unsigned long flags;
-
-		local_irq_save(flags);
-		/* See commentary in sun4c_flush_cache_range(). */
-		for (entry = head->next;
-		     (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
-		     entry = entry->next)
-			;
-
-		if ((entry != head) && (entry->vaddr < end)) {
-			int octx = sun4c_get_context();
-
-			sun4c_set_context(new_ctx);
-			do {
-				struct sun4c_mmu_entry *next = entry->next;
-
-				sun4c_flush_segment(entry->vaddr);
-				sun4c_user_unmap(entry);
-				free_user_entry(new_ctx, entry);
-
-				entry = next;
-			} while ((entry != head) && (entry->vaddr < end));
-			sun4c_set_context(octx);
-		}
-		local_irq_restore(flags);
-	}
-}
-
-static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	struct mm_struct *mm = vma->vm_mm;
-	int new_ctx = mm->context;
-
-	if (new_ctx != NO_CONTEXT) {
-		int savectx = sun4c_get_context();
-		unsigned long flags;
-
-		local_irq_save(flags);
-		sun4c_set_context(new_ctx);
-		page &= PAGE_MASK;
-		sun4c_flush_page(page);
-		sun4c_put_pte(page, 0);
-		sun4c_set_context(savectx);
-		local_irq_restore(flags);
-	}
-}
-
-static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
-{
-	unsigned long page_entry, pg_iobits;
-
-	pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
-		    _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
-
-	page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
-	page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
-	sun4c_put_pte(virt_addr, page_entry);
-}
-
-static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
-    unsigned long xva, unsigned int len)
-{
-	while (len != 0) {
-		len -= PAGE_SIZE;
-		sun4c_mapioaddr(xpa, xva);
-		xva += PAGE_SIZE;
-		xpa += PAGE_SIZE;
-	}
-}
-
-static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
-{
-	while (len != 0) {
-		len -= PAGE_SIZE;
-		sun4c_put_pte(virt_addr, 0);
-		virt_addr += PAGE_SIZE;
-	}
-}
-
-static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
-{
-	struct ctx_list *ctxp;
-
-	ctxp = ctx_free.next;
-	if (ctxp != &ctx_free) {
-		remove_from_ctx_list(ctxp);
-		add_to_used_ctxlist(ctxp);
-		mm->context = ctxp->ctx_number;
-		ctxp->ctx_mm = mm;
-		return;
-	}
-	ctxp = ctx_used.next;
-	if (ctxp->ctx_mm == old_mm)
-		ctxp = ctxp->next;
-	remove_from_ctx_list(ctxp);
-	add_to_used_ctxlist(ctxp);
-	ctxp->ctx_mm->context = NO_CONTEXT;
-	ctxp->ctx_mm = mm;
-	mm->context = ctxp->ctx_number;
-	sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
-			       ctxp->ctx_number);
-}
-
-/* Switch the current MM context. */
-static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
-{
-	struct ctx_list *ctx;
-	int dirty = 0;
-
-	if (mm->context == NO_CONTEXT) {
-		dirty = 1;
-		sun4c_alloc_context(old_mm, mm);
-	} else {
-		/* Update the LRU ring of contexts. */
-		ctx = ctx_list_pool + mm->context;
-		remove_from_ctx_list(ctx);
-		add_to_used_ctxlist(ctx);
-	}
-	if (dirty || old_mm != mm)
-		sun4c_set_context(mm->context);
-}
-
-static void sun4c_destroy_context(struct mm_struct *mm)
-{
-	struct ctx_list *ctx_old;
-
-	if (mm->context != NO_CONTEXT) {
-		sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
-		ctx_old = ctx_list_pool + mm->context;
-		remove_from_ctx_list(ctx_old);
-		add_to_free_ctxlist(ctx_old);
-		mm->context = NO_CONTEXT;
-	}
-}
-
-static void sun4c_mmu_info(struct seq_file *m)
-{
-	int used_user_entries, i;
-
-	used_user_entries = 0;
-	for (i = 0; i < num_contexts; i++)
-		used_user_entries += sun4c_context_ring[i].num_entries;
-
-	seq_printf(m, 
-		   "vacsize\t\t: %d bytes\n"
-		   "vachwflush\t: %s\n"
-		   "vaclinesize\t: %d bytes\n"
-		   "mmuctxs\t\t: %d\n"
-		   "mmupsegs\t: %d\n"
-		   "kernelpsegs\t: %d\n"
-		   "kfreepsegs\t: %d\n"
-		   "usedpsegs\t: %d\n"
-		   "ufreepsegs\t: %d\n"
-		   "user_taken\t: %d\n"
-		   "max_taken\t: %d\n",
-		   sun4c_vacinfo.num_bytes,
-		   (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
-		   sun4c_vacinfo.linesize,
-		   num_contexts,
-		   (invalid_segment + 1),
-		   sun4c_kernel_ring.num_entries,
-		   sun4c_kfree_ring.num_entries,
-		   used_user_entries,
-		   sun4c_ufree_ring.num_entries,
-		   sun4c_user_taken_entries,
-		   max_user_taken_entries);
-}
-
-/* Nothing below here should touch the mmu hardware nor the mmu_entry
- * data structures.
- */
-
-/* First the functions which the mid-level code uses to directly
- * manipulate the software page tables.  Some defines since we are
- * emulating the i386 page directory layout.
- */
-#define PGD_PRESENT  0x001
-#define PGD_RW       0x002
-#define PGD_USER     0x004
-#define PGD_ACCESSED 0x020
-#define PGD_DIRTY    0x040
-#define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
-
-static void sun4c_set_pte(pte_t *ptep, pte_t pte)
-{
-	*ptep = pte;
-}
-
-static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
-{
-}
-
-static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
-{
-	pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
-}
-
-static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
-{
-	if (page_address(ptep) == NULL) BUG();	/* No highmem on sun4c */
-	pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
-}
-
-static int sun4c_pte_present(pte_t pte)
-{
-	return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
-}
-static void sun4c_pte_clear(pte_t *ptep)	{ *ptep = __pte(0); }
-
-static int sun4c_pmd_bad(pmd_t pmd)
-{
-	return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
-		(!virt_addr_valid(pmd_val(pmd))));
-}
-
-static int sun4c_pmd_present(pmd_t pmd)
-{
-	return ((pmd_val(pmd) & PGD_PRESENT) != 0);
-}
-
-#if 0 /* if PMD takes one word */
-static void sun4c_pmd_clear(pmd_t *pmdp)	{ *pmdp = __pmd(0); }
-#else /* if pmd_t is a longish aggregate */
-static void sun4c_pmd_clear(pmd_t *pmdp) {
-	memset((void *)pmdp, 0, sizeof(pmd_t));
-}
-#endif
-
-static int sun4c_pgd_none(pgd_t pgd)		{ return 0; }
-static int sun4c_pgd_bad(pgd_t pgd)		{ return 0; }
-static int sun4c_pgd_present(pgd_t pgd)	        { return 1; }
-static void sun4c_pgd_clear(pgd_t * pgdp)	{ }
-
-/*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
-static pte_t sun4c_pte_mkwrite(pte_t pte)
-{
-	pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
-	if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
-		pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
-	return pte;
-}
-
-static pte_t sun4c_pte_mkdirty(pte_t pte)
-{
-	pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
-	if (pte_val(pte) & _SUN4C_PAGE_WRITE)
-		pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
-	return pte;
-}
-
-static pte_t sun4c_pte_mkyoung(pte_t pte)
-{
-	pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
-	if (pte_val(pte) & _SUN4C_PAGE_READ)
-		pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
-	return pte;
-}
-
-/*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- */
-static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
-{
-	return __pte(page_to_pfn(page) | pgprot_val(pgprot));
-}
-
-static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
-{
-	return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
-}
-
-static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
-{
-	return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
-}
-
-static unsigned long sun4c_pte_pfn(pte_t pte)
-{
-	return pte_val(pte) & SUN4C_PFN_MASK;
-}
-
-static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
-{
-	return __pte(pgoff | _SUN4C_PAGE_FILE);
-}
-
-static unsigned long sun4c_pte_to_pgoff(pte_t pte)
-{
-	return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
-}
-
-
-static inline unsigned long sun4c_pmd_page_v(pmd_t pmd)
-{
-	return (pmd_val(pmd) & PAGE_MASK);
-}
-
-static struct page *sun4c_pmd_page(pmd_t pmd)
-{
-	return virt_to_page(sun4c_pmd_page_v(pmd));
-}
-
-static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
-
-/* to find an entry in a page-table-directory */
-static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
-{
-	return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
-}
-
-/* Find an entry in the second-level page table.. */
-static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
-{
-	return (pmd_t *) dir;
-}
-
-/* Find an entry in the third-level page table.. */ 
-pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
-{
-	return (pte_t *) sun4c_pmd_page_v(*dir) +
-			((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
-}
-
-static unsigned long sun4c_swp_type(swp_entry_t entry)
-{
-	return (entry.val & SUN4C_SWP_TYPE_MASK);
-}
-
-static unsigned long sun4c_swp_offset(swp_entry_t entry)
-{
-	return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
-}
-
-static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
-{
-	return (swp_entry_t) {
-		  (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
-		| (type & SUN4C_SWP_TYPE_MASK) };
-}
-
-static void sun4c_free_pte_slow(pte_t *pte)
-{
-	free_page((unsigned long)pte);
-}
-
-static void sun4c_free_pgd_slow(pgd_t *pgd)
-{
-	free_page((unsigned long)pgd);
-}
-
-static pgd_t *sun4c_get_pgd_fast(void)
-{
-	unsigned long *ret;
-
-	if ((ret = pgd_quicklist) != NULL) {
-		pgd_quicklist = (unsigned long *)(*ret);
-		ret[0] = ret[1];
-		pgtable_cache_size--;
-	} else {
-		pgd_t *init;
-		
-		ret = (unsigned long *)__get_free_page(GFP_KERNEL);
-		memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
-		init = sun4c_pgd_offset(&init_mm, 0);
-		memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
-			(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
-	}
-	return (pgd_t *)ret;
-}
-
-static void sun4c_free_pgd_fast(pgd_t *pgd)
-{
-	*(unsigned long *)pgd = (unsigned long) pgd_quicklist;
-	pgd_quicklist = (unsigned long *) pgd;
-	pgtable_cache_size++;
-}
-
-
-static inline pte_t *
-sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
-{
-	unsigned long *ret;
-
-	if ((ret = (unsigned long *)pte_quicklist) != NULL) {
-		pte_quicklist = (unsigned long *)(*ret);
-		ret[0] = ret[1];
-		pgtable_cache_size--;
-	}
-	return (pte_t *)ret;
-}
-
-static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
-{
-	pte_t *pte;
-
-	if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
-		return pte;
-
-	pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
-	return pte;
-}
-
-static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
-{
-	pte_t *pte;
-	struct page *page;
-
-	pte = sun4c_pte_alloc_one_kernel(mm, address);
-	if (pte == NULL)
-		return NULL;
-	page = virt_to_page(pte);
-	pgtable_page_ctor(page);
-	return page;
-}
-
-static inline void sun4c_free_pte_fast(pte_t *pte)
-{
-	*(unsigned long *)pte = (unsigned long) pte_quicklist;
-	pte_quicklist = (unsigned long *) pte;
-	pgtable_cache_size++;
-}
-
-static void sun4c_pte_free(pgtable_t pte)
-{
-	pgtable_page_dtor(pte);
-	sun4c_free_pte_fast(page_address(pte));
-}
-
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
-{
-	BUG();
-	return NULL;
-}
-
-static void sun4c_free_pmd_fast(pmd_t * pmd) { }
-
-static void sun4c_check_pgt_cache(int low, int high)
-{
-	if (pgtable_cache_size > high) {
-		do {
-			if (pgd_quicklist)
-				sun4c_free_pgd_slow(sun4c_get_pgd_fast());
-			if (pte_quicklist)
-				sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
-		} while (pgtable_cache_size > low);
-	}
-}
-
-/* An experiment, turn off by default for now... -DaveM */
-#define SUN4C_PRELOAD_PSEG
-
-void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
-{
-	unsigned long flags;
-	int pseg;
-
-	if (vma->vm_mm->context == NO_CONTEXT)
-		return;
-
-	local_irq_save(flags);
-	address &= PAGE_MASK;
-	if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
-		struct sun4c_mmu_entry *entry = sun4c_user_strategy();
-		struct mm_struct *mm = vma->vm_mm;
-		unsigned long start, end;
-
-		entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
-		entry->ctx = mm->context;
-		add_ring_ordered(sun4c_context_ring + mm->context, entry);
-		sun4c_put_segmap(entry->vaddr, entry->pseg);
-		end = start + SUN4C_REAL_PGDIR_SIZE;
-		while (start < end) {
-#ifdef SUN4C_PRELOAD_PSEG
-			pgd_t *pgdp = sun4c_pgd_offset(mm, start);
-			pte_t *ptep;
-
-			if (!pgdp)
-				goto no_mapping;
-			ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
-			if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
-				goto no_mapping;
-			sun4c_put_pte(start, pte_val(*ptep));
-			goto next;
-
-		no_mapping:
-#endif
-			sun4c_put_pte(start, 0);
-#ifdef SUN4C_PRELOAD_PSEG
-		next:
-#endif
-			start += PAGE_SIZE;
-		}
-#ifndef SUN4C_PRELOAD_PSEG
-		sun4c_put_pte(address, pte_val(*ptep));
-#endif
-		local_irq_restore(flags);
-		return;
-	} else {
-		struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
-
-		remove_lru(entry);
-		add_lru(entry);
-	}
-
-	sun4c_put_pte(address, pte_val(*ptep));
-	local_irq_restore(flags);
-}
-
-extern void sparc_context_init(int);
-extern unsigned long bootmem_init(unsigned long *pages_avail);
-extern unsigned long last_valid_pfn;
-
-void __init sun4c_paging_init(void)
-{
-	int i, cnt;
-	unsigned long kernel_end, vaddr;
-	extern struct resource sparc_iomap;
-	unsigned long end_pfn, pages_avail;
-
-	kernel_end = (unsigned long) &_end;
-	kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
-
-	pages_avail = 0;
-	last_valid_pfn = bootmem_init(&pages_avail);
-	end_pfn = last_valid_pfn;
-
-	sun4c_probe_mmu();
-	invalid_segment = (num_segmaps - 1);
-	sun4c_init_mmu_entry_pool();
-	sun4c_init_rings();
-	sun4c_init_map_kernelprom(kernel_end);
-	sun4c_init_clean_mmu(kernel_end);
-	sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
-	sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
-	sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
-	sun4c_init_lock_areas();
-	sun4c_init_fill_user_ring();
-
-	sun4c_set_context(0);
-	memset(swapper_pg_dir, 0, PAGE_SIZE);
-	memset(pg0, 0, PAGE_SIZE);
-	memset(pg1, 0, PAGE_SIZE);
-	memset(pg2, 0, PAGE_SIZE);
-	memset(pg3, 0, PAGE_SIZE);
-
-	/* Save work later. */
-	vaddr = VMALLOC_START;
-	swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
-	vaddr += SUN4C_PGDIR_SIZE;
-	swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
-	vaddr += SUN4C_PGDIR_SIZE;
-	swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
-	vaddr += SUN4C_PGDIR_SIZE;
-	swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
-	sun4c_init_ss2_cache_bug();
-	sparc_context_init(num_contexts);
-
-	{
-		unsigned long zones_size[MAX_NR_ZONES];
-		unsigned long zholes_size[MAX_NR_ZONES];
-		unsigned long npages;
-		int znum;
-
-		for (znum = 0; znum < MAX_NR_ZONES; znum++)
-			zones_size[znum] = zholes_size[znum] = 0;
-
-		npages = max_low_pfn - pfn_base;
-
-		zones_size[ZONE_DMA] = npages;
-		zholes_size[ZONE_DMA] = npages - pages_avail;
-
-		npages = highend_pfn - max_low_pfn;
-		zones_size[ZONE_HIGHMEM] = npages;
-		zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
-
-		free_area_init_node(0, zones_size, pfn_base, zholes_size);
-	}
-
-	cnt = 0;
-	for (i = 0; i < num_segmaps; i++)
-		if (mmu_entry_pool[i].locked)
-			cnt++;
-
-	max_user_taken_entries = num_segmaps - cnt - 40 - 1;
-
-	printk("SUN4C: %d mmu entries for the kernel\n", cnt);
-}
-
-static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
-{
-	prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
-
-	return prot;
-}
-
-/* Load up routines and constants for sun4c mmu */
-void __init ld_mmu_sun4c(void)
-{
-	extern void ___xchg32_sun4c(void);
-	
-	printk("Loading sun4c MMU routines\n");
-
-	/* First the constants */
-	BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
-	BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
-	BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
-
-	BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
-	BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
-	BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
-
-	BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
-	PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
-	BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
-	BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
-	BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
-	page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
-
-	/* Functions */
-	BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
-	
-	BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
-
-	if (sun4c_vacinfo.do_hwflushes) {
-		BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
-		BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
-		BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
-	} else {
-		BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
-		BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
-		BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
-	}
-
-	BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
-
-	BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
-
-	BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
-#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
-	BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
-#else
-	BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
-#endif
-	BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
-
-	BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
-
-	BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
-	BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
-	BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
-	BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
-
-	BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
-	BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
-	BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
-	BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
-	BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
-	BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
-	BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
-	BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
-	BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
-	BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
-	BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(alloc_thread_info_node, sun4c_alloc_thread_info_node, BTFIXUPCALL_NORM);
-	BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
-
-	BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
-
-	/* These should _never_ get called with two level tables. */
-	BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
-	BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
-}
diff --git a/arch/sparc/prom/Makefile b/arch/sparc/prom/Makefile
index 8287bbe..020300b 100644
--- a/arch/sparc/prom/Makefile
+++ b/arch/sparc/prom/Makefile
@@ -10,7 +10,6 @@  lib-$(CONFIG_SPARC32) += memory.o
 lib-y                 += misc_$(BITS).o
 lib-$(CONFIG_SPARC32) += mp.o
 lib-$(CONFIG_SPARC32) += ranges.o
-lib-$(CONFIG_SPARC32) += segment.o
 lib-y                 += console_$(BITS).o
 lib-y                 += printf.o
 lib-y                 += tree_$(BITS).o
diff --git a/arch/sparc/prom/segment.c b/arch/sparc/prom/segment.c
deleted file mode 100644
index 86a663f..0000000
--- a/arch/sparc/prom/segment.c
+++ /dev/null
@@ -1,28 +0,0 @@ 
-/*
- * segment.c:  Prom routine to map segments in other contexts before
- *             a standalone is completely mapped.  This is for sun4 and
- *             sun4c architectures only.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- */
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <asm/openprom.h>
-#include <asm/oplib.h>
-
-extern void restore_current(void);
-
-/* Set physical segment 'segment' at virtual address 'vaddr' in
- * context 'ctx'.
- */
-void
-prom_putsegment(int ctx, unsigned long vaddr, int segment)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&prom_lock, flags);
-	(*(romvec->pv_setctxt))(ctx, (char *) vaddr, segment);
-	restore_current();
-	spin_unlock_irqrestore(&prom_lock, flags);
-}