From patchwork Thu Jan 16 08:31:50 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuo-Jung Su X-Patchwork-Id: 311627 X-Patchwork-Delegate: albert.aribaud@free.fr Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from theia.denx.de (theia.denx.de [85.214.87.163]) by ozlabs.org (Postfix) with ESMTP id 687C82C009A for ; Thu, 16 Jan 2014 19:33:27 +1100 (EST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id C35424AAD0; Thu, 16 Jan 2014 09:33:25 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r1L+5C7BeYTP; Thu, 16 Jan 2014 09:33:25 +0100 (CET) Received: from theia.denx.de (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id A05504AAD4; Thu, 16 Jan 2014 09:33:23 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id CBF714AAC0 for ; Thu, 16 Jan 2014 09:33:17 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IhJi8heZ5x72 for ; Thu, 16 Jan 2014 09:33:11 +0100 (CET) X-policyd-weight: NOT_IN_SBL_XBL_SPAMHAUS=-1.5 NOT_IN_SPAMCOP=-1.5 NOT_IN_BL_NJABL=-1.5 (only DNSBL check requested) Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by theia.denx.de (Postfix) with ESMTPS id 1D3404AB42 for ; Thu, 16 Jan 2014 09:33:01 +0100 (CET) Received: by mail-pd0-f181.google.com with SMTP id p10so2284457pdj.26 for ; Thu, 16 Jan 2014 00:33:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=MUaPB3lyPimd1QfRtD8wDottKNp6zrC4pwqflvZoKAg=; b=QmEDvSQSyErO2i8u9K3nwW9z+D+KaHA7Cs0PWGjPWbU9X+E6YiaCgE0VqEcvL0zb4A FUKL/HAuT0/hHGM02Ydjw851bGeuei+IfewBa66sZz2Y+93/5kHFnVWqnyryhyRE3b/6 LRLiafGElrwAlnn41eitG8az94XWvYQPzK8bccc0SCyFxZJ6saH9gjRsj/MP1BLEUQAP t3uQx4vGlkuGoIP2cBas+mcQSyPz5yEB61EQKg3Z8kyVWEdTkXHLvsqabh2FzI6l27Wu R/OHIEOEtE+F2v8as30ZOrC8AJNoimTyA3ggtHGR9cm4ocS7qGiR3/SKlnIJMLkQwoLO ZABg== X-Received: by 10.66.179.143 with SMTP id dg15mr8210512pac.52.1389861180522; Thu, 16 Jan 2014 00:33:00 -0800 (PST) Received: from localhost ([42.71.217.34]) by mx.google.com with ESMTPSA id qw8sm13344954pbb.27.2014.01.16.00.32.45 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 16 Jan 2014 00:32:59 -0800 (PST) From: Kuo-Jung Su To: u-boot@lists.denx.de Date: Thu, 16 Jan 2014 16:31:50 +0800 Message-Id: <1389861116-3728-2-git-send-email-dantesu@gmail.com> X-Mailer: git-send-email 1.8.4.msysgit.0 In-Reply-To: <1389861116-3728-1-git-send-email-dantesu@gmail.com> References: <1389861116-3728-1-git-send-email-dantesu@gmail.com> In-Reply-To: <1364540788-13943-1-git-send-email-dantesu@gmail.com> References: <1364540788-13943-1-git-send-email-dantesu@gmail.com> Cc: Kuo-Jung Su Subject: [U-Boot] [PATCH v9 1/7] arm: add Faraday ARMv5TE cores support X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.11 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de From: Kuo-Jung Su Here is the list of verified cores: 1. FA606TE (ARMv5TE, no mmu) 2. FA626TE (ARMv5TE) Signed-off-by: Kuo-Jung Su CC: Albert Aribaud --- Changes for v9: - Build 'arch_preboot_os()' only when CONFIG_CMD_BOOTM is defined. - Add do_go_exec() to override the default behavior of 'go' command. Changes for v8: - add arm_init_before_mmu() & mmu_page_table_flush() Changes for v7: - Update license to use SPDX identifiers. Changes for v6: - Nothing updates Changes for v5: - Initial commit arch/arm/cpu/faraday/Makefile | 10 + arch/arm/cpu/faraday/cache.c | 164 ++++++++++++++++ arch/arm/cpu/faraday/config.mk | 15 ++ arch/arm/cpu/faraday/cpu.c | 115 ++++++++++++ arch/arm/cpu/faraday/start.S | 407 ++++++++++++++++++++++++++++++++++++++++ 5 files changed, 711 insertions(+) create mode 100644 arch/arm/cpu/faraday/Makefile create mode 100644 arch/arm/cpu/faraday/cache.c create mode 100644 arch/arm/cpu/faraday/config.mk create mode 100644 arch/arm/cpu/faraday/cpu.c create mode 100644 arch/arm/cpu/faraday/start.S -- 1.7.9.5 diff --git a/arch/arm/cpu/faraday/Makefile b/arch/arm/cpu/faraday/Makefile new file mode 100644 index 0000000..c859238 --- /dev/null +++ b/arch/arm/cpu/faraday/Makefile @@ -0,0 +1,10 @@ +# +# (C) Copyright 2000-2003 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# SPDX-License-Identifier: GPL-2.0+ +# + +extra-y := start.o + +obj-y += cpu.o cache.o diff --git a/arch/arm/cpu/faraday/cache.c b/arch/arm/cpu/faraday/cache.c new file mode 100644 index 0000000..2acb954 --- /dev/null +++ b/arch/arm/cpu/faraday/cache.c @@ -0,0 +1,164 @@ +/* + * (C) Copyright 2013 + * Faraday Technology Corporation. + * Kuo-Jung Su + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include + +/* + * I-Cache + */ + +void invalidate_icache_all(void) +{ +#if !defined(CONFIG_SYS_ICACHE_OFF) + asm volatile ( + "mov r0, #0\n" + "mcr p15, 0, r0, c7, c5, 0\n" + : /* output */ + : /* input */ + : "r0" + ); +#endif /* !CONFIG_SYS_ICACHE_OFF */ +} + +/* + * D-Cache + */ + +void flush_dcache_all(void) +{ +#if !defined(CONFIG_SYS_DCACHE_OFF) + asm volatile ( + "mov r0, #0\n" + "mcr p15, 0, r0, c7, c14, 0\n" /* clean & invalidate */ + "mcr p15, 0, r0, c7, c10, 4\n" /* drain write buffer */ + : /* output */ + : /* input */ + : "r0" + ); +#endif /* !CONFIG_SYS_DCACHE_OFF */ +} + +void flush_dcache_range(unsigned long start, unsigned long stop) +{ +#if !defined(CONFIG_SYS_DCACHE_OFF) + unsigned long line = CONFIG_SYS_CACHELINE_SIZE; + unsigned long mask = ~(line - 1); + + /* aligned to cache line */ + stop = (line - 1 + stop) & mask; + start = start & mask; + + asm volatile ( + "1:\n" + "mcr p15, 0, %0, c7, c14, 1\n" /* clean & invalidate */ + "add %0, %0, %2\n" + "cmp %0, %1\n" + "blo 1b\n" + "mov r0, #0\n" + "mcr p15, 0, r0, c7, c10, 4\n" /* drain write buffer */ + : "+r"(start) + : "r"(stop), "r"(line) + : "r0" + ); +#endif /* !CONFIG_SYS_DCACHE_OFF */ +} + +void invalidate_dcache_range(unsigned long start, unsigned long stop) +{ +#if !defined(CONFIG_SYS_DCACHE_OFF) + unsigned long line = CONFIG_SYS_CACHELINE_SIZE; + unsigned long mask = ~(line - 1); + + /* aligned to cache line */ + stop = (line - 1 + stop) & mask; + start = start & mask; + + asm volatile ( + "1:\n" + "mcr p15, 0, %0, c7, c6, 1\n" + "add %0, %0, %2\n" + "cmp %0, %1\n" + "blo 1b\n" + : "+r"(start) + : "r"(stop), "r"(line) + ); +#endif /* !CONFIG_SYS_DCACHE_OFF */ +} + +void invalidate_dcache_all(void) +{ +#if !defined(CONFIG_SYS_DCACHE_OFF) + asm volatile ( + "mov r0, #0\n" + "mcr p15, 0, r0, c7, c6, 0\n" + : /* output */ + : /* input */ + : "r0" + ); +#endif /* !CONFIG_SYS_DCACHE_OFF */ +} + +void flush_cache(unsigned long start, unsigned long size) +{ + flush_dcache_range(start, start + size); +} + +/* + * MMU + */ + +static void invalidate_utlb_all(void) +{ +#if !defined(CONFIG_SYS_DCACHE_OFF) + asm volatile ( + "mov r0, #0\n" + "mcr p15, 0, r0, c8, c7, 0\n" + : /* output */ + : /* input */ + : "r0" + ); +#endif /* !CONFIG_SYS_DCACHE_OFF */ +} + +static void invalidate_utlb_range(unsigned long start, unsigned long stop) +{ +#if !defined(CONFIG_SYS_DCACHE_OFF) + uint32_t page = 4096; + uint32_t mask = ~(page - 1); + + /* aligned to page boundary */ + stop = (page - 1 + stop) & mask; + start = start & mask; + + /* invalidate U-TLB entry */ + asm volatile ( + "1:\n" + "mcr p15, 0, %0, c8, c7, 1\n" + "add %0, %0, %1\n" + "cmp %0, %2\n" + "blo 1b\n" + : "+r"(start) + : "r"(page), "r"(stop) + ); +#endif /* !CONFIG_SYS_DCACHE_OFF */ +} + +void arm_init_before_mmu(void) +{ + invalidate_dcache_all(); + invalidate_utlb_all(); +} + +void mmu_page_table_flush(unsigned long start, unsigned long stop) +{ + flush_dcache_range(start, stop); + invalidate_utlb_range(start, stop); +} diff --git a/arch/arm/cpu/faraday/config.mk b/arch/arm/cpu/faraday/config.mk new file mode 100644 index 0000000..f39e70b --- /dev/null +++ b/arch/arm/cpu/faraday/config.mk @@ -0,0 +1,15 @@ +# +# (C) Copyright 2000-2003 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# SPDX-License-Identifier: GPL-2.0+ +# + +PLATFORM_CPPFLAGS += -march=armv5te +# ========================================================================= +# +# Supply options according to compiler version +# +# ========================================================================= +PF_RELFLAGS_SLB_AT := $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) +PLATFORM_RELFLAGS += $(PF_RELFLAGS_SLB_AT) diff --git a/arch/arm/cpu/faraday/cpu.c b/arch/arm/cpu/faraday/cpu.c new file mode 100644 index 0000000..8eef357 --- /dev/null +++ b/arch/arm/cpu/faraday/cpu.c @@ -0,0 +1,115 @@ +/* + * (C) Copyright 2013 + * Faraday Technology Corporation. + * Kuo-Jung Su + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +/* + * This enable_caches() overrides the weak function + * in "arch/arm/lib/cache.c". + */ +void enable_caches(void) +{ + icache_enable(); + dcache_enable(); +} + +int cleanup_before_linux(void) +{ + /* + * this function is called just before we call linux + * it prepares the processor for linux + * + * we turn off caches etc ... + */ + disable_interrupts(); + + /* + * Turn off I-cache and invalidate it + */ + icache_disable(); + invalidate_icache_all(); + + /* + * Turn off D-cache + * dcache_disable() in turn flushes the d-cache and disables MMU + */ + dcache_disable(); + + /* + * After D-cache is flushed and before it is disabled there may + * be some new valid entries brought into the cache. We are sure + * that these lines are not dirty and will not affect our execution. + * So just invalidate the entire d-cache again to avoid coherency + * problems for kernel + */ + invalidate_dcache_all(); + + return 0; +} + +void reset_cpu(unsigned long ignored) +{ +#ifdef CONFIG_FTWDT010_BASE + struct ftwdt010_wdt *regs = (void __iomem *)CONFIG_FTWDT010_BASE; + + /* Disable WDT */ + writel(0, ®s->wdcr); + /* Timeout in 1000 ticks */ + writel(1000, ®s->wdload); + /* Enable WDT with system reset */ + writel(FTWDT010_WDCR_ENABLE | FTWDT010_WDCR_RST, ®s->wdcr); +#endif +} + +#ifdef CONFIG_DISPLAY_CPUINFO +int print_cpuinfo(void) +{ + /* print cpu_info */ + printf("CPU: %u MHz\n", + (unsigned int)(clk_get_rate("CPU") / 1000000)); + + printf("AHB: %u MHz\n", + (unsigned int)(clk_get_rate("AHB") / 1000000)); + + printf("APB: %u MHz\n", + (unsigned int)(clk_get_rate("APB") / 1000000)); + + return 0; +} +#endif /* CONFIG_DISPLAY_CPUINFO */ + +#ifdef CONFIG_CMD_GO +/* + * This do_go_exec() overrides the weak function + * in "cmd_boot.c". + */ +unsigned long do_go_exec(ulong (*entry)(int, char * const []), int argc, + char * const argv[]) +{ + cleanup_before_linux(); + return entry(argc, argv); +} +#endif /* CONFIG_CMD_GO */ + +#ifdef CONFIG_CMD_BOOTM +/* + * This arch_preboot_os() overrides the weak function + * in "cmd_bootm.c". + */ +void arch_preboot_os(void) +{ + cleanup_before_linux(); +} +#endif /* CONFIG_CMD_BOOTM */ diff --git a/arch/arm/cpu/faraday/start.S b/arch/arm/cpu/faraday/start.S new file mode 100644 index 0000000..32ce92e --- /dev/null +++ b/arch/arm/cpu/faraday/start.S @@ -0,0 +1,407 @@ +/* + * u-boot - Startup Code for Faraday CPU-core + * + * Base is arch/arm/cpu/arm926ejs/start.S + * + * (C) Copyright 2013 Faraday Technology + * Kuo-Jung Su + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include + +/* + ************************************************************************* + * + * Jump vector table as in table 3.1 in [1] + * + ************************************************************************* + */ + + +#ifdef CONFIG_SYS_DV_NOR_BOOT_CFG +.globl _start +_start: +.globl _NOR_BOOT_CFG +_NOR_BOOT_CFG: + .word CONFIG_SYS_DV_NOR_BOOT_CFG + b reset +#else +.globl _start +_start: + b reset +#endif +#ifdef CONFIG_SPL_BUILD +/* No exception handlers in preloader */ + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + +_hang: + .word do_hang +/* pad to 64 byte boundary */ + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 +#else + ldr pc, _undefined_instruction + ldr pc, _software_interrupt + ldr pc, _prefetch_abort + ldr pc, _data_abort + ldr pc, _not_used + ldr pc, _irq + ldr pc, _fiq + +_undefined_instruction: + .word undefined_instruction +_software_interrupt: + .word software_interrupt +_prefetch_abort: + .word prefetch_abort +_data_abort: + .word data_abort +_not_used: + .word not_used +_irq: + .word irq +_fiq: + .word fiq + +#endif /* CONFIG_SPL_BUILD */ + .balignl 16,0xdeadbeef + + +/* + ************************************************************************* + * + * Startup Code (reset vector) + * + * do important init only if we don't start from memory! + * setup Memory and board specific bits prior to relocation. + * relocate armboot to ram + * setup stack + * + ************************************************************************* + */ + +.globl _TEXT_BASE +_TEXT_BASE: +#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_TEXT_BASE) + .word CONFIG_SPL_TEXT_BASE +#else + .word CONFIG_SYS_TEXT_BASE +#endif + +/* + * These are defined in the board-specific linker script. + * Subtracting _start from them lets the linker put their + * relative position in the executable instead of leaving + * them null. + */ +.globl _bss_start_ofs +_bss_start_ofs: + .word __bss_start - _start + +.globl _bss_end_ofs +_bss_end_ofs: + .word __bss_end - _start + +.globl _end_ofs +_end_ofs: + .word _end - _start + +#ifdef CONFIG_USE_IRQ +/* IRQ stack memory (calculated at run-time) */ +.globl IRQ_STACK_START +IRQ_STACK_START: + .word 0x0badc0de + +/* IRQ stack memory (calculated at run-time) */ +.globl FIQ_STACK_START +FIQ_STACK_START: + .word 0x0badc0de +#endif + +/* IRQ stack memory (calculated at run-time) + 8 bytes */ +.globl IRQ_STACK_START_IN +IRQ_STACK_START_IN: + .word 0x0badc0de + +/* + * the actual reset code + */ + +reset: + /* + * set the cpu to SVC32 mode + */ + mrs r0,cpsr + bic r0,r0,#0x1f + orr r0,r0,#0xd3 + msr cpsr,r0 + + /* + * we do sys-critical inits only at reboot, + * not when booting from ram! + */ +#ifndef CONFIG_SKIP_LOWLEVEL_INIT + bl cpu_init_crit +#endif + + /* + * With the following bootstrap relocation, we could flawless + * boot from either ROM or NOR flash. + */ + adr r0, _start /* r0 <- current position of code */ + ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ + teq r0, r1 /* don't reloc during debug */ + bleq _main + ldr r2, _end_ofs /* r2 <- size of u-boot */ + add r2, r0, r2 /* r2 <- source end address */ + +reloc_loop: + ldmia r0!, {r3-r10} /* copy from source address [r0] */ + stmia r1!, {r3-r10} /* copy to target address [r1] */ + cmp r0, r2 /* until source end addreee [r2] */ + blo reloc_loop + + ldr pc, =_main + +/*----------------------------------------------------------------------*/ + + .globl c_runtime_cpu_setup +c_runtime_cpu_setup: + mov pc, lr + +/* + ************************************************************************* + * + * CPU_init_critical registers + * + * setup important registers + * setup memory timing + * + ************************************************************************* + */ +#ifndef CONFIG_SKIP_LOWLEVEL_INIT +cpu_init_crit: + /* + * flush D cache before disabling it + */ + mov r0, #0 + mcr p15, 0, r0, c7, c14, 0 /* clean & invalidate D cache */ + mcr p15, 0, r0, c8, c7, 0 /* invalidate TLB */ + mcr p15, 0, r0, c7, c5, 0 /* invalidate I Cache */ + mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */ + + /* + * disable MMU and D cache + * enable I cache if CONFIG_SYS_ICACHE_OFF is not defined + */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #0x00000300 /* clear bits 9:8 (---- --RS) */ + bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */ +#ifdef CONFIG_SYS_EXCEPTION_VECTORS_HIGH + orr r0, r0, #0x00002000 /* set bit 13 (--V- ----) */ +#else + bic r0, r0, #0x00002000 /* clear bit 13 (--V- ----) */ +#endif + orr r0, r0, #0x00000002 /* set bit 2 (A) Align */ +#ifndef CONFIG_SYS_ICACHE_OFF + orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ +#endif + mcr p15, 0, r0, c1, c0, 0 + + /* + * Go setup Memory and board specific bits prior to relocation. + */ + mov ip, lr /* perserve link reg across call */ + bl lowlevel_init /* go setup pll,mux,memory */ + mov lr, ip /* restore link */ + mov pc, lr /* back to my caller */ +#endif /* CONFIG_SKIP_LOWLEVEL_INIT */ + +#ifndef CONFIG_SPL_BUILD +/* + ************************************************************************* + * + * Interrupt handling + * + ************************************************************************* + */ + +@ +@ IRQ stack frame. +@ +#define S_FRAME_SIZE 72 + +#define S_OLD_R0 68 +#define S_PSR 64 +#define S_PC 60 +#define S_LR 56 +#define S_SP 52 + +#define S_IP 48 +#define S_FP 44 +#define S_R10 40 +#define S_R9 36 +#define S_R8 32 +#define S_R7 28 +#define S_R6 24 +#define S_R5 20 +#define S_R4 16 +#define S_R3 12 +#define S_R2 8 +#define S_R1 4 +#define S_R0 0 + +#define MODE_SVC 0x13 +#define I_BIT 0x80 + +/* + * use bad_save_user_regs for abort/prefetch/undef/swi ... + * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling + */ + + .macro bad_save_user_regs + @ carve out a frame on current user stack + sub sp, sp, #S_FRAME_SIZE + stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 + ldr r2, IRQ_STACK_START_IN + @ get values for "aborted" pc and cpsr (into parm regs) + ldmia r2, {r2 - r3} + add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack + add r5, sp, #S_SP + mov r1, lr + stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr + mov r0, sp @ save current stack into r0 (param register) + .endm + + .macro irq_save_user_regs + sub sp, sp, #S_FRAME_SIZE + stmia sp, {r0 - r12} @ Calling r0-r12 + @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good. + add r8, sp, #S_PC + stmdb r8, {sp, lr}^ @ Calling SP, LR + str lr, [r8, #0] @ Save calling PC + mrs r6, spsr + str r6, [r8, #4] @ Save CPSR + str r0, [r8, #8] @ Save OLD_R0 + mov r0, sp + .endm + + .macro irq_restore_user_regs + ldmia sp, {r0 - lr}^ @ Calling r0 - lr + mov r0, r0 + ldr lr, [sp, #S_PC] @ Get PC + add sp, sp, #S_FRAME_SIZE + subs pc, lr, #4 @ return & move spsr_svc into cpsr + .endm + + .macro get_bad_stack + ldr r13, IRQ_STACK_START_IN @ setup our mode stack + + str lr, [r13] @ save caller lr in position 0 of saved stack + mrs lr, spsr @ get the spsr + str lr, [r13, #4] @ save spsr in position 1 of saved stack + mov r13, #MODE_SVC @ prepare SVC-Mode + @ msr spsr_c, r13 + msr spsr, r13 @ switch modes, make sure moves will execute + mov lr, pc @ capture return pc + movs pc, lr @ jump to next instruction & switch modes. + .endm + + .macro get_irq_stack @ setup IRQ stack + ldr sp, IRQ_STACK_START + .endm + + .macro get_fiq_stack @ setup FIQ stack + ldr sp, FIQ_STACK_START + .endm +#endif /* CONFIG_SPL_BUILD */ + +/* + * exception handlers + */ +#ifdef CONFIG_SPL_BUILD + .align 5 +do_hang: + ldr sp, _TEXT_BASE /* switch to abort stack */ +1: + bl 1b /* hang and never return */ +#else /* !CONFIG_SPL_BUILD */ + .align 5 +undefined_instruction: + get_bad_stack + bad_save_user_regs + bl do_undefined_instruction + + .align 5 +software_interrupt: + get_bad_stack + bad_save_user_regs + bl do_software_interrupt + + .align 5 +prefetch_abort: + get_bad_stack + bad_save_user_regs + bl do_prefetch_abort + + .align 5 +data_abort: + get_bad_stack + bad_save_user_regs + bl do_data_abort + + .align 5 +not_used: + get_bad_stack + bad_save_user_regs + bl do_not_used + +#ifdef CONFIG_USE_IRQ + + .align 5 +irq: + get_irq_stack + irq_save_user_regs + bl do_irq + irq_restore_user_regs + + .align 5 +fiq: + get_fiq_stack + /* someone ought to write a more effiction fiq_save_user_regs */ + irq_save_user_regs + bl do_fiq + irq_restore_user_regs + +#else + + .align 5 +irq: + get_bad_stack + bad_save_user_regs + bl do_irq + + .align 5 +fiq: + get_bad_stack + bad_save_user_regs + bl do_fiq + +#endif +#endif /* CONFIG_SPL_BUILD */