diff options
| author | Paul Mackerras <paulus@samba.org> | 2006-01-14 02:11:39 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-01-14 02:11:39 +0300 |
| commit | 80f15dc703b3677d0b025bafd215f1f3664c8978 (patch) | |
| tree | fa60781edcedefe4eb6baa6d213a62bbc6d7803a /include/asm-powerpc | |
| parent | 25cd6aa0aa059b48cdcef2a00981b14fafd5161a (diff) | |
| download | linux-80f15dc703b3677d0b025bafd215f1f3664c8978.tar.xz | |
powerpc: Provide a suitable AT_PLATFORM value
The glibc folks want to use AT_PLATFORM to select between possible
alternative versions of shared libraries. This commit makes the kernel
supply an AT_PLATFORM string that indicates what class of processor
we are running on. Processors with the same set of user-level
instructions and roughly the same instruction scheduling characteristics
are given the same AT_PLATFORM value; for example, 821, 823 and 860
are all reported as "ppc823", and 7447, 7447A, 7448, 7450, 7451, 7455
are all called "ppc7450".
The intention is that the AT_PLATFORM values match the values that
gcc accepts for the -mcpu= option. For values which are numeric
(e.g. -mcpu=750), "ppc" has been prepended.
This also adds a PPC_FEATURE_BOOKE bit to the AT_HWCAP value and sets
it for the 440 family and the Freescale 85xx family.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc')
| -rw-r--r-- | include/asm-powerpc/cputable.h | 4 | ||||
| -rw-r--r-- | include/asm-powerpc/elf.h | 16 |
2 files changed, 11 insertions, 9 deletions
diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h index ef6ead34a773..03017d905704 100644 --- a/include/asm-powerpc/cputable.h +++ b/include/asm-powerpc/cputable.h @@ -19,6 +19,7 @@ #define PPC_FEATURE_POWER5 0x00040000 #define PPC_FEATURE_POWER5_PLUS 0x00020000 #define PPC_FEATURE_CELL 0x00010000 +#define PPC_FEATURE_BOOKE 0x00008000 #ifdef __KERNEL__ #ifndef __ASSEMBLY__ @@ -64,6 +65,9 @@ struct cpu_spec { /* Processor specific oprofile operations */ enum powerpc_oprofile_type oprofile_type; + + /* Name of processor class, for the ELF AT_PLATFORM entry */ + char *platform; }; extern struct cpu_spec *cur_cpu_spec; diff --git a/include/asm-powerpc/elf.h b/include/asm-powerpc/elf.h index 45f2af6f89c4..94d228f9c6ac 100644 --- a/include/asm-powerpc/elf.h +++ b/include/asm-powerpc/elf.h @@ -221,20 +221,18 @@ extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *); instruction set this cpu supports. This could be done in userspace, but it's not easy, and we've already done it here. */ # define ELF_HWCAP (cur_cpu_spec->cpu_user_features) -#ifdef __powerpc64__ -# define ELF_PLAT_INIT(_r, load_addr) do { \ - _r->gpr[2] = load_addr; \ -} while (0) -#endif /* __powerpc64__ */ /* This yields a string that ld.so will use to load implementation specific libraries for optimization. This is more specific in - intent than poking at uname or /proc/cpuinfo. + intent than poking at uname or /proc/cpuinfo. */ - For the moment, we have only optimizations for the Intel generations, - but that could change... */ +#define ELF_PLATFORM (cur_cpu_spec->platform) -#define ELF_PLATFORM (NULL) +#ifdef __powerpc64__ +# define ELF_PLAT_INIT(_r, load_addr) do { \ + _r->gpr[2] = load_addr; \ +} while (0) +#endif /* __powerpc64__ */ #ifdef __KERNEL__ |