| Message ID | 1455380910-30604-12-git-send-email-drjones@redhat.com |
|---|---|
| State | Superseded |
| Headers | show |
On Sat, Feb 13, 2016 at 05:28:24PM +0100, Andrew Jones wrote: > Add broken sc1 detection and patching and an hcall for putchar, > to use in puts. That, along with a couple more lines in start to > prepare for C code, and a branch to main(), gets us "hello world". > Run with > > qemu-system-ppc64 -M pseries \ > -bios powerpc/boot_rom.bin \ > -display none -serial stdio \ > -kernel powerpc/selftest.elf > > (We're still not relocating yet, that comes in a later patch. Thus, > testing hello-world at this point requires a hacked QEMU and linking > the unit test at QEMU's kernel load address.) > > Signed-off-by: Andrew Jones <drjones@redhat.com> > --- > lib/powerpc/asm/hcall.h | 43 +++++++++++++++++++++++++++ > lib/powerpc/hcall.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++ > lib/powerpc/io.c | 15 ++++++++-- > lib/ppc64/asm/hcall.h | 1 + > powerpc/Makefile.common | 2 ++ > powerpc/cstart64.S | 21 +++++++++++++ > 6 files changed, 159 insertions(+), 2 deletions(-) > create mode 100644 lib/powerpc/asm/hcall.h > create mode 100644 lib/powerpc/hcall.c > create mode 100644 lib/ppc64/asm/hcall.h > > diff --git a/lib/powerpc/asm/hcall.h b/lib/powerpc/asm/hcall.h > new file mode 100644 > index 0000000000000..75eac456c49eb > --- /dev/null > +++ b/lib/powerpc/asm/hcall.h > @@ -0,0 +1,43 @@ > +#ifndef _ASMPOWERPC_HCALL_H_ > +#define _ASMPOWERPC_HCALL_H_ > +/* > + * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> > + * > + * This work is licensed under the terms of the GNU LGPL, version 2. > + */ > + > +#define SC1 0x44000022 > +#define SC1_REPLACEMENT 0x7c000268 > + > +#define H_SUCCESS 0 > +#define H_HARDWARE -1 > + > +#define H_SET_DABR 0x28 > +#define H_PUT_TERM_CHAR 0x58 > + > +#ifndef __ASSEMBLY__ > +#include <libcflat.h> > + > +/* > + * hcall_have_broken_sc1 checks if we're on a host with a broken sc1. > + * Returns true if we are. > + */ > +extern bool hcall_have_broken_sc1(void); > + > +/* > + * hcall_patch_broken_sc1 patches hcall's sc1 instruction, if needed, > + * allowing all hypercalls built on it to work. > + */ > +extern void hcall_patch_broken_sc1(void); > + > +/* > + * hcall is the hypercall wrapper function. unittests may do what > + * they like, but the framework should make all hypercalls through > + * here to ensure they use a working sc1 instruction, and properly > + * handle clobbered registers. @nr is the hypercall number. > + */ > +extern unsigned long > +hcall(unsigned long nr, unsigned long *in, unsigned long *out); > + > +#endif /* !__ASSEMBLY__ */ > +#endif /* _ASMPOWERPC_HCALL_H_ */ > diff --git a/lib/powerpc/hcall.c b/lib/powerpc/hcall.c > new file mode 100644 > index 0000000000000..4c42b18ef9901 > --- /dev/null > +++ b/lib/powerpc/hcall.c > @@ -0,0 +1,79 @@ > +/* > + * Hypercall helpers > + * > + * broken_sc1 probing/patching inspired by SLOF, see > + * SLOF:lib/libhvcall/brokensc1.c > + * > + * hcall() implementation inspired by Linux's epapr_hypercall, see > + * arch/powerpc/include/asm/epapr_hcalls.h > + * > + * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> > + * > + * This work is licensed under the terms of the GNU LGPL, version 2. > + */ > +#include <libcflat.h> > +#include <asm/hcall.h> > + > +static u32 sc1[]; > + > +bool hcall_have_broken_sc1(void) > +{ > + register unsigned long r3 asm("r3") = H_SET_DABR; > + register unsigned long r4 asm("r4") = 0; > + > + asm volatile("sc 1" > + : "=r" (r3) > + : "r" (r3), "r" (r4) > + : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"); > + > + return !(r3 == H_SUCCESS || r3 == (unsigned long)H_HARDWARE); It might be safer to explicitly check for H_PRIVILEGE, which is what you'll get in the case of a broken sc 1 under nested virtualization. That way you won't get false positives if H_SET_DABR ever gets any new error codes it can return. > +} > + > +void hcall_patch_broken_sc1(void) > +{ > + if (!hcall_have_broken_sc1()) > + return; > + sc1[0] = SC1_REPLACEMENT; > +} > + > +unsigned long hcall(unsigned long nr, unsigned long *in, unsigned long *out) > +{ > + register unsigned long r3 asm("r3") = nr; > + register unsigned long r4 asm("r4") = in[0]; > + register unsigned long r5 asm("r5") = in[1]; > + register unsigned long r6 asm("r6") = in[2]; > + register unsigned long r7 asm("r7") = in[3]; > + register unsigned long r8 asm("r8") = in[4]; > + register unsigned long r9 asm("r9") = in[5]; > + register unsigned long r10 asm("r10") = in[6]; > + register unsigned long r11 asm("r11") = in[7]; > + > + asm volatile("bl sc1" > + : "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6), "=r"(r7), > + "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11) > + : "r"(r3), "r"(r4), "r"(r5), "r"(r6), "r"(r7), > + "r"(r8), "r"(r9), "r"(r10), "r"(r11) > + : "r12", "memory", "lr"); > + > + out[0] = r4; > + out[1] = r5; > + out[2] = r6; > + out[3] = r7; > + out[4] = r8; > + out[5] = r9; > + out[6] = r10; > + out[7] = r11; > + > + return r3; > +} > + > +void putchar(int c) > +{ > + unsigned long in[8], out[8]; > + > + in[0] = 0; /* default vty */ > + in[1] = 1; /* just 1 byte */ > + in[2] = (unsigned long)c << 56; > + > + hcall(H_PUT_TERM_CHAR, in, out); > +} > diff --git a/lib/powerpc/io.c b/lib/powerpc/io.c > index 0af45742fc900..5e1fa8dd96ab6 100644 > --- a/lib/powerpc/io.c > +++ b/lib/powerpc/io.c > @@ -6,15 +6,26 @@ > * This work is licensed under the terms of the GNU LGPL, version 2. > */ > #include <libcflat.h> > +#include <asm/spinlock.h> > + > +extern void halt(int code); > +extern void putchar(int c); > + > +static struct spinlock uart_lock; > > void io_init(void) > { > } > > -void puts(const char *s __unused) > +void puts(const char *s) > { > + spin_lock(&uart_lock); > + while (*s) > + putchar(*s++); > + spin_unlock(&uart_lock); > } > > -void exit(int code __unused) > +void exit(int code) > { > + halt(code); > } > diff --git a/lib/ppc64/asm/hcall.h b/lib/ppc64/asm/hcall.h > new file mode 100644 > index 0000000000000..daabaca510cd4 > --- /dev/null > +++ b/lib/ppc64/asm/hcall.h > @@ -0,0 +1 @@ > +#include "../../powerpc/asm/hcall.h" > diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common > index 0c3eaba0d3aab..89610b525f0c1 100644 > --- a/powerpc/Makefile.common > +++ b/powerpc/Makefile.common > @@ -21,6 +21,7 @@ CFLAGS += -ffreestanding > CFLAGS += -Wextra > CFLAGS += -O2 > CFLAGS += -I lib -I lib/libfdt > +CFLAGS += -Wa,-mregnames > > asm-offsets = lib/$(ARCH)/asm-offsets.h > include scripts/asm-offsets.mak > @@ -29,6 +30,7 @@ cflatobjs += lib/util.o > cflatobjs += lib/alloc.o > cflatobjs += lib/devicetree.o > cflatobjs += lib/powerpc/io.o > +cflatobjs += lib/powerpc/hcall.o > > libgcc := $(shell $(CC) $(machine) --print-libgcc-file-name) > start_addr := $(shell printf "%x\n" $$(( $(phys_base) + $(kernel_offset) ))) > diff --git a/powerpc/cstart64.S b/powerpc/cstart64.S > index f90828dee1c19..623fd693b02d1 100644 > --- a/powerpc/cstart64.S > +++ b/powerpc/cstart64.S > @@ -7,13 +7,34 @@ > */ > #define __ASSEMBLY__ > > +#define LOAD_REG_IMMEDIATE(reg,expr) \ > + lis reg,(expr)@highest; \ > + ori reg,reg,(expr)@higher; \ > + rldicr reg,reg,32,31; \ > + oris reg,reg,(expr)@h; \ > + ori reg,reg,(expr)@l; > + > +#define LOAD_REG_ADDR(reg,name) \ > + ld reg,name@got(r2) > + > .section .init > > .globl start > start: > + LOAD_REG_IMMEDIATE(r1, stackptr) > + LOAD_REG_IMMEDIATE(r2, tocptr) > + bl hcall_patch_broken_sc1 > + bl main > + bl exit > b halt > > .text > +.align 3 > + > +.globl sc1 > +sc1: > + sc 1 > + blr > > .globl halt > halt:
On 15.02.2016 00:29, David Gibson wrote: > On Sat, Feb 13, 2016 at 05:28:24PM +0100, Andrew Jones wrote: >> Add broken sc1 detection and patching and an hcall for putchar, >> to use in puts. That, along with a couple more lines in start to >> prepare for C code, and a branch to main(), gets us "hello world". >> Run with >> >> qemu-system-ppc64 -M pseries \ >> -bios powerpc/boot_rom.bin \ >> -display none -serial stdio \ >> -kernel powerpc/selftest.elf >> >> (We're still not relocating yet, that comes in a later patch. Thus, >> testing hello-world at this point requires a hacked QEMU and linking >> the unit test at QEMU's kernel load address.) >> >> Signed-off-by: Andrew Jones <drjones@redhat.com> >> --- >> lib/powerpc/asm/hcall.h | 43 +++++++++++++++++++++++++++ >> lib/powerpc/hcall.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++ >> lib/powerpc/io.c | 15 ++++++++-- >> lib/ppc64/asm/hcall.h | 1 + >> powerpc/Makefile.common | 2 ++ >> powerpc/cstart64.S | 21 +++++++++++++ >> 6 files changed, 159 insertions(+), 2 deletions(-) >> create mode 100644 lib/powerpc/asm/hcall.h >> create mode 100644 lib/powerpc/hcall.c >> create mode 100644 lib/ppc64/asm/hcall.h >> >> diff --git a/lib/powerpc/asm/hcall.h b/lib/powerpc/asm/hcall.h >> new file mode 100644 >> index 0000000000000..75eac456c49eb >> --- /dev/null >> +++ b/lib/powerpc/asm/hcall.h >> @@ -0,0 +1,43 @@ >> +#ifndef _ASMPOWERPC_HCALL_H_ >> +#define _ASMPOWERPC_HCALL_H_ >> +/* >> + * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> >> + * >> + * This work is licensed under the terms of the GNU LGPL, version 2. >> + */ >> + >> +#define SC1 0x44000022 >> +#define SC1_REPLACEMENT 0x7c000268 >> + >> +#define H_SUCCESS 0 >> +#define H_HARDWARE -1 >> + >> +#define H_SET_DABR 0x28 >> +#define H_PUT_TERM_CHAR 0x58 >> + >> +#ifndef __ASSEMBLY__ >> +#include <libcflat.h> >> + >> +/* >> + * hcall_have_broken_sc1 checks if we're on a host with a broken sc1. >> + * Returns true if we are. >> + */ >> +extern bool hcall_have_broken_sc1(void); >> + >> +/* >> + * hcall_patch_broken_sc1 patches hcall's sc1 instruction, if needed, >> + * allowing all hypercalls built on it to work. >> + */ >> +extern void hcall_patch_broken_sc1(void); >> + >> +/* >> + * hcall is the hypercall wrapper function. unittests may do what >> + * they like, but the framework should make all hypercalls through >> + * here to ensure they use a working sc1 instruction, and properly >> + * handle clobbered registers. @nr is the hypercall number. >> + */ >> +extern unsigned long >> +hcall(unsigned long nr, unsigned long *in, unsigned long *out); >> + >> +#endif /* !__ASSEMBLY__ */ >> +#endif /* _ASMPOWERPC_HCALL_H_ */ >> diff --git a/lib/powerpc/hcall.c b/lib/powerpc/hcall.c >> new file mode 100644 >> index 0000000000000..4c42b18ef9901 >> --- /dev/null >> +++ b/lib/powerpc/hcall.c >> @@ -0,0 +1,79 @@ >> +/* >> + * Hypercall helpers >> + * >> + * broken_sc1 probing/patching inspired by SLOF, see >> + * SLOF:lib/libhvcall/brokensc1.c >> + * >> + * hcall() implementation inspired by Linux's epapr_hypercall, see >> + * arch/powerpc/include/asm/epapr_hcalls.h >> + * >> + * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> >> + * >> + * This work is licensed under the terms of the GNU LGPL, version 2. >> + */ >> +#include <libcflat.h> >> +#include <asm/hcall.h> >> + >> +static u32 sc1[]; >> + >> +bool hcall_have_broken_sc1(void) >> +{ >> + register unsigned long r3 asm("r3") = H_SET_DABR; >> + register unsigned long r4 asm("r4") = 0; >> + >> + asm volatile("sc 1" >> + : "=r" (r3) >> + : "r" (r3), "r" (r4) >> + : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"); >> + >> + return !(r3 == H_SUCCESS || r3 == (unsigned long)H_HARDWARE); > > It might be safer to explicitly check for H_PRIVILEGE, which is what > you'll get in the case of a broken sc 1 under nested virtualization. > That way you won't get false positives if H_SET_DABR ever gets any new > error codes it can return. Right - actually, H_SET_DABR already might return H_RESERVED_DABR now if the host does not support the DABRX register. Thomas
On Mon, Feb 15, 2016 at 10:29:54AM +1100, David Gibson wrote: > On Sat, Feb 13, 2016 at 05:28:24PM +0100, Andrew Jones wrote: > > +bool hcall_have_broken_sc1(void) > > +{ > > + register unsigned long r3 asm("r3") = H_SET_DABR; > > + register unsigned long r4 asm("r4") = 0; > > + > > + asm volatile("sc 1" > > + : "=r" (r3) > > + : "r" (r3), "r" (r4) > > + : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"); > > + > > + return !(r3 == H_SUCCESS || r3 == (unsigned long)H_HARDWARE); > > It might be safer to explicitly check for H_PRIVILEGE, which is what > you'll get in the case of a broken sc 1 under nested virtualization. > That way you won't get false positives if H_SET_DABR ever gets any new > error codes it can return. Will do. Thanks. Should we consider a SLOF patch too? (As I stole this condition from there, see check_broken_sc1 in lib/libhvcall/brokensc1.c) Thanks, drew -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 15.02.2016 09:54, Andrew Jones wrote: > On Mon, Feb 15, 2016 at 10:29:54AM +1100, David Gibson wrote: >> On Sat, Feb 13, 2016 at 05:28:24PM +0100, Andrew Jones wrote: >>> +bool hcall_have_broken_sc1(void) >>> +{ >>> + register unsigned long r3 asm("r3") = H_SET_DABR; >>> + register unsigned long r4 asm("r4") = 0; >>> + >>> + asm volatile("sc 1" >>> + : "=r" (r3) >>> + : "r" (r3), "r" (r4) >>> + : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"); >>> + >>> + return !(r3 == H_SUCCESS || r3 == (unsigned long)H_HARDWARE); >> >> It might be safer to explicitly check for H_PRIVILEGE, which is what >> you'll get in the case of a broken sc 1 under nested virtualization. >> That way you won't get false positives if H_SET_DABR ever gets any new >> error codes it can return. > > Will do. Thanks. Should we consider a SLOF patch too? (As I stole this > condition from there, see check_broken_sc1 in lib/libhvcall/brokensc1.c) Yes, I think it should be fixed there, too. Thomas -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/lib/powerpc/asm/hcall.h b/lib/powerpc/asm/hcall.h new file mode 100644 index 0000000000000..75eac456c49eb --- /dev/null +++ b/lib/powerpc/asm/hcall.h @@ -0,0 +1,43 @@ +#ifndef _ASMPOWERPC_HCALL_H_ +#define _ASMPOWERPC_HCALL_H_ +/* + * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> + * + * This work is licensed under the terms of the GNU LGPL, version 2. + */ + +#define SC1 0x44000022 +#define SC1_REPLACEMENT 0x7c000268 + +#define H_SUCCESS 0 +#define H_HARDWARE -1 + +#define H_SET_DABR 0x28 +#define H_PUT_TERM_CHAR 0x58 + +#ifndef __ASSEMBLY__ +#include <libcflat.h> + +/* + * hcall_have_broken_sc1 checks if we're on a host with a broken sc1. + * Returns true if we are. + */ +extern bool hcall_have_broken_sc1(void); + +/* + * hcall_patch_broken_sc1 patches hcall's sc1 instruction, if needed, + * allowing all hypercalls built on it to work. + */ +extern void hcall_patch_broken_sc1(void); + +/* + * hcall is the hypercall wrapper function. unittests may do what + * they like, but the framework should make all hypercalls through + * here to ensure they use a working sc1 instruction, and properly + * handle clobbered registers. @nr is the hypercall number. + */ +extern unsigned long +hcall(unsigned long nr, unsigned long *in, unsigned long *out); + +#endif /* !__ASSEMBLY__ */ +#endif /* _ASMPOWERPC_HCALL_H_ */ diff --git a/lib/powerpc/hcall.c b/lib/powerpc/hcall.c new file mode 100644 index 0000000000000..4c42b18ef9901 --- /dev/null +++ b/lib/powerpc/hcall.c @@ -0,0 +1,79 @@ +/* + * Hypercall helpers + * + * broken_sc1 probing/patching inspired by SLOF, see + * SLOF:lib/libhvcall/brokensc1.c + * + * hcall() implementation inspired by Linux's epapr_hypercall, see + * arch/powerpc/include/asm/epapr_hcalls.h + * + * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com> + * + * This work is licensed under the terms of the GNU LGPL, version 2. + */ +#include <libcflat.h> +#include <asm/hcall.h> + +static u32 sc1[]; + +bool hcall_have_broken_sc1(void) +{ + register unsigned long r3 asm("r3") = H_SET_DABR; + register unsigned long r4 asm("r4") = 0; + + asm volatile("sc 1" + : "=r" (r3) + : "r" (r3), "r" (r4) + : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"); + + return !(r3 == H_SUCCESS || r3 == (unsigned long)H_HARDWARE); +} + +void hcall_patch_broken_sc1(void) +{ + if (!hcall_have_broken_sc1()) + return; + sc1[0] = SC1_REPLACEMENT; +} + +unsigned long hcall(unsigned long nr, unsigned long *in, unsigned long *out) +{ + register unsigned long r3 asm("r3") = nr; + register unsigned long r4 asm("r4") = in[0]; + register unsigned long r5 asm("r5") = in[1]; + register unsigned long r6 asm("r6") = in[2]; + register unsigned long r7 asm("r7") = in[3]; + register unsigned long r8 asm("r8") = in[4]; + register unsigned long r9 asm("r9") = in[5]; + register unsigned long r10 asm("r10") = in[6]; + register unsigned long r11 asm("r11") = in[7]; + + asm volatile("bl sc1" + : "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6), "=r"(r7), + "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11) + : "r"(r3), "r"(r4), "r"(r5), "r"(r6), "r"(r7), + "r"(r8), "r"(r9), "r"(r10), "r"(r11) + : "r12", "memory", "lr"); + + out[0] = r4; + out[1] = r5; + out[2] = r6; + out[3] = r7; + out[4] = r8; + out[5] = r9; + out[6] = r10; + out[7] = r11; + + return r3; +} + +void putchar(int c) +{ + unsigned long in[8], out[8]; + + in[0] = 0; /* default vty */ + in[1] = 1; /* just 1 byte */ + in[2] = (unsigned long)c << 56; + + hcall(H_PUT_TERM_CHAR, in, out); +} diff --git a/lib/powerpc/io.c b/lib/powerpc/io.c index 0af45742fc900..5e1fa8dd96ab6 100644 --- a/lib/powerpc/io.c +++ b/lib/powerpc/io.c @@ -6,15 +6,26 @@ * This work is licensed under the terms of the GNU LGPL, version 2. */ #include <libcflat.h> +#include <asm/spinlock.h> + +extern void halt(int code); +extern void putchar(int c); + +static struct spinlock uart_lock; void io_init(void) { } -void puts(const char *s __unused) +void puts(const char *s) { + spin_lock(&uart_lock); + while (*s) + putchar(*s++); + spin_unlock(&uart_lock); } -void exit(int code __unused) +void exit(int code) { + halt(code); } diff --git a/lib/ppc64/asm/hcall.h b/lib/ppc64/asm/hcall.h new file mode 100644 index 0000000000000..daabaca510cd4 --- /dev/null +++ b/lib/ppc64/asm/hcall.h @@ -0,0 +1 @@ +#include "../../powerpc/asm/hcall.h" diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common index 0c3eaba0d3aab..89610b525f0c1 100644 --- a/powerpc/Makefile.common +++ b/powerpc/Makefile.common @@ -21,6 +21,7 @@ CFLAGS += -ffreestanding CFLAGS += -Wextra CFLAGS += -O2 CFLAGS += -I lib -I lib/libfdt +CFLAGS += -Wa,-mregnames asm-offsets = lib/$(ARCH)/asm-offsets.h include scripts/asm-offsets.mak @@ -29,6 +30,7 @@ cflatobjs += lib/util.o cflatobjs += lib/alloc.o cflatobjs += lib/devicetree.o cflatobjs += lib/powerpc/io.o +cflatobjs += lib/powerpc/hcall.o libgcc := $(shell $(CC) $(machine) --print-libgcc-file-name) start_addr := $(shell printf "%x\n" $$(( $(phys_base) + $(kernel_offset) ))) diff --git a/powerpc/cstart64.S b/powerpc/cstart64.S index f90828dee1c19..623fd693b02d1 100644 --- a/powerpc/cstart64.S +++ b/powerpc/cstart64.S @@ -7,13 +7,34 @@ */ #define __ASSEMBLY__ +#define LOAD_REG_IMMEDIATE(reg,expr) \ + lis reg,(expr)@highest; \ + ori reg,reg,(expr)@higher; \ + rldicr reg,reg,32,31; \ + oris reg,reg,(expr)@h; \ + ori reg,reg,(expr)@l; + +#define LOAD_REG_ADDR(reg,name) \ + ld reg,name@got(r2) + .section .init .globl start start: + LOAD_REG_IMMEDIATE(r1, stackptr) + LOAD_REG_IMMEDIATE(r2, tocptr) + bl hcall_patch_broken_sc1 + bl main + bl exit b halt .text +.align 3 + +.globl sc1 +sc1: + sc 1 + blr .globl halt halt:
Add broken sc1 detection and patching and an hcall for putchar, to use in puts. That, along with a couple more lines in start to prepare for C code, and a branch to main(), gets us "hello world". Run with qemu-system-ppc64 -M pseries \ -bios powerpc/boot_rom.bin \ -display none -serial stdio \ -kernel powerpc/selftest.elf (We're still not relocating yet, that comes in a later patch. Thus, testing hello-world at this point requires a hacked QEMU and linking the unit test at QEMU's kernel load address.) Signed-off-by: Andrew Jones <drjones@redhat.com> --- lib/powerpc/asm/hcall.h | 43 +++++++++++++++++++++++++++ lib/powerpc/hcall.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++ lib/powerpc/io.c | 15 ++++++++-- lib/ppc64/asm/hcall.h | 1 + powerpc/Makefile.common | 2 ++ powerpc/cstart64.S | 21 +++++++++++++ 6 files changed, 159 insertions(+), 2 deletions(-) create mode 100644 lib/powerpc/asm/hcall.h create mode 100644 lib/powerpc/hcall.c create mode 100644 lib/ppc64/asm/hcall.h