diff options
| author | Nathan Lynch <ntl@pobox.com> | 2008-07-16 09:58:51 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-25 15:44:39 +1000 |
| commit | 9115d13453dee22473a1e8cacc90a8d64a9c4bc9 (patch) | |
| tree | dc6c7b1aad8861ae5f88aaf496fd634338686330 | |
| parent | 483fad1c3fa1060d7e6710e84a065ad514571739 (diff) | |
| download | linux-9115d13453dee22473a1e8cacc90a8d64a9c4bc9.tar.gz linux-9115d13453dee22473a1e8cacc90a8d64a9c4bc9.tar.bz2 linux-9115d13453dee22473a1e8cacc90a8d64a9c4bc9.zip | |
powerpc: Enable AT_BASE_PLATFORM aux vector
Stash the first platform string matched by identify_cpu() in
powerpc_base_platform, and supply that to the ELF loader for the value
of AT_BASE_PLATFORM.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/kernel/cputable.c | 11 | ||||
| -rw-r--r-- | include/asm-powerpc/cputable.h | 2 | ||||
| -rw-r--r-- | include/asm-powerpc/elf.h | 8 |
3 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c index b936a1dd0a50..25a052c16754 100644 --- a/arch/powerpc/kernel/cputable.c +++ b/arch/powerpc/kernel/cputable.c @@ -23,6 +23,9 @@ struct cpu_spec* cur_cpu_spec = NULL; EXPORT_SYMBOL(cur_cpu_spec); +/* The platform string corresponding to the real PVR */ +const char *powerpc_base_platform; + /* NOTE: * Unlike ppc32, ppc64 will only call this once for the boot CPU, it's * the responsibility of the appropriate CPU save/restore functions to @@ -1652,6 +1655,14 @@ struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr) } else *t = *s; *PTRRELOC(&cur_cpu_spec) = &the_cpu_spec; + + /* + * Set the base platform string once; assumes + * we're called with real pvr first. + */ + if (powerpc_base_platform == NULL) + powerpc_base_platform = t->platform; + #if defined(CONFIG_PPC64) || defined(CONFIG_BOOKE) /* ppc64 and booke expect identify_cpu to also call * setup_cpu for that processor. I will consolidate diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h index 2a3e9075a5a0..ef8a248dfd55 100644 --- a/include/asm-powerpc/cputable.h +++ b/include/asm-powerpc/cputable.h @@ -127,6 +127,8 @@ extern struct cpu_spec *identify_cpu(unsigned long offset, unsigned int pvr); extern void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end); +extern const char *powerpc_base_platform; + #endif /* __ASSEMBLY__ */ /* CPU kernel features */ diff --git a/include/asm-powerpc/elf.h b/include/asm-powerpc/elf.h index 89664675b469..80d1f399ee51 100644 --- a/include/asm-powerpc/elf.h +++ b/include/asm-powerpc/elf.h @@ -217,6 +217,14 @@ typedef elf_vrregset_t elf_fpxregset_t; #define ELF_PLATFORM (cur_cpu_spec->platform) +/* While ELF_PLATFORM indicates the ISA supported by the platform, it + * may not accurately reflect the underlying behavior of the hardware + * (as in the case of running in Power5+ compatibility mode on a + * Power6 machine). ELF_BASE_PLATFORM allows ld.so to load libraries + * that are tuned for the real hardware. + */ +#define ELF_BASE_PLATFORM (powerpc_base_platform) + #ifdef __powerpc64__ # define ELF_PLAT_INIT(_r, load_addr) do { \ _r->gpr[2] = load_addr; \ |