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sh: Encode L1/L2 cache shape in auxvt.

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This adds in the L1I/L1D/L2 cache shape support to their respective
entries in the ELF auxvt, based on the Alpha implementation. We use
this on the userspace libc side for calculating a tightly packed
SHMLBA amongst other things.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2007-12-10 15:50:28 +09:00
parent c8c0a1aba9
commit cd01204b82
5 changed files with 60 additions and 5 deletions
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12
include/asm-sh/auxvec.h
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@@ -15,4 +15,16 @@
#define AT_SYSINFO_EHDR 33
#endif
/*
* More complete cache descriptions than AT_[DIU]CACHEBSIZE. If the
* value is -1, then the cache doesn't exist. Otherwise:
*
* bit 0-3: Cache set-associativity; 0 means fully associative.
* bit 4-7: Log2 of cacheline size.
* bit 8-31: Size of the entire cache >> 8.
*/
#define AT_L1I_CACHESHAPE 34
#define AT_L1D_CACHESHAPE 35
#define AT_L2_CACHESHAPE 36
#endif /* __ASM_SH_AUXVEC_H */

19
include/asm-sh/elf.h
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@@ -161,12 +161,25 @@ extern void __kernel_vsyscall;
#define VDSO_BASE ((unsigned long)current->mm->context.vdso)
#define VDSO_SYM(x) (VDSO_BASE + (unsigned long)(x))
#define VSYSCALL_AUX_ENT \
if (vdso_enabled) \
NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE);
#else
#define VSYSCALL_AUX_ENT
#endif /* CONFIG_VSYSCALL */
extern int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
#define ARCH_DLINFO \
do { \
if (vdso_enabled) \
NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
/* Optional vsyscall entry */ \
VSYSCALL_AUX_ENT \
\
/* Cache desc */ \
NEW_AUX_ENT(AT_L1I_CACHESHAPE, l1i_cache_shape); \
NEW_AUX_ENT(AT_L1D_CACHESHAPE, l1d_cache_shape); \
NEW_AUX_ENT(AT_L2_CACHESHAPE, l2_cache_shape); \
} while (0)
#endif /* CONFIG_VSYSCALL */
#endif /* __ASM_SH_ELF_H */

2
include/asm-sh/system.h
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@@ -12,7 +12,7 @@
#include <asm/types.h>
#include <asm/ptrace.h>
#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
#define AT_VECTOR_SIZE_ARCH 4 /* entries in ARCH_DLINFO */
#if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
#define __icbi() \