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ARM: 8318/1: treat CPU feature register fields as signed quantities

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The various CPU feature registers consist of 4-bit blocks that
represent signed quantities, whose positive values represent
incremental features, and whose negative values are reserved.

To improve forward compatibility, update the feature detection
code to take possible future higher values into account, but
ignore negative values.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ard Biesheuvel 2015-03-19 19:03:25 +01:00 committed by Russell King
parent eb765c1ceb
commit b8c9592b4a
2 changed files with 25 additions and 13 deletions
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16
arch/arm/include/asm/cputype.h
View File

@ -253,4 +253,20 @@ static inline int cpu_is_pj4(void)
#else
#define cpu_is_pj4() 0
#endif
static inline int __attribute_const__ cpuid_feature_extract_field(u32 features,
int field)
{
int feature = (features >> field) & 15;
/* feature registers are signed values */
if (feature > 8)
feature -= 16;
return feature;
}
#define cpuid_feature_extract(reg, field) \
cpuid_feature_extract_field(read_cpuid_ext(reg), field)
#endif

22
arch/arm/kernel/setup.c
View File

@ -375,30 +375,26 @@ void __init early_print(const char *str, ...)
static void __init cpuid_init_hwcaps(void)
{
unsigned int divide_instrs, vmsa;
int block;
if (cpu_architecture() < CPU_ARCH_ARMv7)
return;
divide_instrs = (read_cpuid_ext(CPUID_EXT_ISAR0) & 0x0f000000) >> 24;
switch (divide_instrs) {
case 2:
block = cpuid_feature_extract(CPUID_EXT_ISAR0, 24);
if (block >= 2)
elf_hwcap |= HWCAP_IDIVA;
case 1:
if (block >= 1)
elf_hwcap |= HWCAP_IDIVT;
}
/* LPAE implies atomic ldrd/strd instructions */
vmsa = (read_cpuid_ext(CPUID_EXT_MMFR0) & 0xf) >> 0;
if (vmsa >= 5)
block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
if (block >= 5)
elf_hwcap |= HWCAP_LPAE;
}
static void __init elf_hwcap_fixup(void)
{
unsigned id = read_cpuid_id();
unsigned sync_prim;
/*
* HWCAP_TLS is available only on 1136 r1p0 and later,
@ -419,9 +415,9 @@ static void __init elf_hwcap_fixup(void)
* avoid advertising SWP; it may not be atomic with
* multiprocessing cores.
*/
sync_prim = ((read_cpuid_ext(CPUID_EXT_ISAR3) >> 8) & 0xf0) |
((read_cpuid_ext(CPUID_EXT_ISAR4) >> 20) & 0x0f);
if (sync_prim >= 0x13)
if (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) > 1 ||
(cpuid_feature_extract(CPUID_EXT_ISAR3, 12) == 1 &&
cpuid_feature_extract(CPUID_EXT_ISAR3, 20) >= 3))
elf_hwcap &= ~HWCAP_SWP;
}