222 lines
7.8 KiB
C
222 lines
7.8 KiB
C
|
#ifndef _ASM_X86_CPUFEATURE_H
|
||
|
|
#define _ASM_X86_CPUFEATURE_H
|
||
|
|
|
||
|
|
#include <asm/processor.h>
|
||
|
|
|
||
|
|
#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
|
||
|
|
|
||
|
|
#include <asm/asm.h>
|
||
|
|
#include <linux/bitops.h>
|
||
|
|
|
||
|
|
enum cpuid_leafs
|
||
|
|
{
|
||
|
|
CPUID_1_EDX = 0,
|
||
|
|
CPUID_8000_0001_EDX,
|
||
|
|
CPUID_8086_0001_EDX,
|
||
|
|
CPUID_LNX_1,
|
||
|
|
CPUID_1_ECX,
|
||
|
|
CPUID_C000_0001_EDX,
|
||
|
|
CPUID_8000_0001_ECX,
|
||
|
|
CPUID_LNX_2,
|
||
|
|
CPUID_LNX_3,
|
||
|
|
CPUID_7_0_EBX,
|
||
|
|
CPUID_D_1_EAX,
|
||
|
|
CPUID_F_0_EDX,
|
||
|
|
CPUID_F_1_EDX,
|
||
|
|
CPUID_8000_0008_EBX,
|
||
|
|
CPUID_6_EAX,
|
||
|
|
CPUID_8000_000A_EDX,
|
||
|
|
CPUID_7_ECX,
|
||
|
|
CPUID_8000_0007_EBX,
|
||
|
|
CPUID_7_EDX,
|
||
|
|
};
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_FEATURE_NAMES
|
||
|
|
extern const char * const x86_cap_flags[NCAPINTS*32];
|
||
|
|
extern const char * const x86_power_flags[32];
|
||
|
|
#define X86_CAP_FMT "%s"
|
||
|
|
#define x86_cap_flag(flag) x86_cap_flags[flag]
|
||
|
|
#else
|
||
|
|
#define X86_CAP_FMT "%d:%d"
|
||
|
|
#define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* In order to save room, we index into this array by doing
|
||
|
|
* X86_BUG_<name> - NCAPINTS*32.
|
||
|
|
*/
|
||
|
|
extern const char * const x86_bug_flags[NBUGINTS*32];
|
||
|
|
|
||
|
|
#define test_cpu_cap(c, bit) \
|
||
|
|
test_bit(bit, (unsigned long *)((c)->x86_capability))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* There are 32 bits/features in each mask word. The high bits
|
||
|
|
* (selected with (bit>>5) give us the word number and the low 5
|
||
|
|
* bits give us the bit/feature number inside the word.
|
||
|
|
* (1UL<<((bit)&31) gives us a mask for the feature_bit so we can
|
||
|
|
* see if it is set in the mask word.
|
||
|
|
*/
|
||
|
|
#define CHECK_BIT_IN_MASK_WORD(maskname, word, bit) \
|
||
|
|
(((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word ))
|
||
|
|
|
||
|
|
#define REQUIRED_MASK_BIT_SET(feature_bit) \
|
||
|
|
( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 0, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 1, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 2, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 3, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 4, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 5, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 6, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 7, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 8, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 9, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \
|
||
|
|
REQUIRED_MASK_CHECK || \
|
||
|
|
BUILD_BUG_ON_ZERO(NCAPINTS != 19))
|
||
|
|
|
||
|
|
#define DISABLED_MASK_BIT_SET(feature_bit) \
|
||
|
|
( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 1, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 2, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 3, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 4, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 5, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 6, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 7, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 8, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 9, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \
|
||
|
|
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \
|
||
|
|
DISABLED_MASK_CHECK || \
|
||
|
|
BUILD_BUG_ON_ZERO(NCAPINTS != 19))
|
||
|
|
|
||
|
|
#define cpu_has(c, bit) \
|
||
|
|
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
|
||
|
|
test_cpu_cap(c, bit))
|
||
|
|
|
||
|
|
#define this_cpu_has(bit) \
|
||
|
|
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
|
||
|
|
x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This macro is for detection of features which need kernel
|
||
|
|
* infrastructure to be used. It may *not* directly test the CPU
|
||
|
|
* itself. Use the cpu_has() family if you want true runtime
|
||
|
|
* testing of CPU features, like in hypervisor code where you are
|
||
|
|
* supporting a possible guest feature where host support for it
|
||
|
|
* is not relevant.
|
||
|
|
*/
|
||
|
|
#define cpu_feature_enabled(bit) \
|
||
|
|
(__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
|
||
|
|
|
||
|
|
#define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit)
|
||
|
|
|
||
|
|
#define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability))
|
||
|
|
#define clear_cpu_cap(c, bit) clear_bit(bit, (unsigned long *)((c)->x86_capability))
|
||
|
|
#define setup_clear_cpu_cap(bit) do { \
|
||
|
|
clear_cpu_cap(&boot_cpu_data, bit); \
|
||
|
|
set_bit(bit, (unsigned long *)cpu_caps_cleared); \
|
||
|
|
} while (0)
|
||
|
|
#define setup_force_cpu_cap(bit) do { \
|
||
|
|
set_cpu_cap(&boot_cpu_data, bit); \
|
||
|
|
set_bit(bit, (unsigned long *)cpu_caps_set); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit)
|
||
|
|
|
||
|
|
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
|
||
|
|
/*
|
||
|
|
* Static testing of CPU features. Used the same as boot_cpu_has().
|
||
|
|
* These will statically patch the target code for additional
|
||
|
|
* performance.
|
||
|
|
*/
|
||
|
|
static __always_inline __pure bool _static_cpu_has(u16 bit)
|
||
|
|
{
|
||
|
|
asm_volatile_goto("1: jmp 6f\n"
|
||
|
|
"2:\n"
|
||
|
|
".skip -(((5f-4f) - (2b-1b)) > 0) * "
|
||
|
|
"((5f-4f) - (2b-1b)),0x90\n"
|
||
|
|
"3:\n"
|
||
|
|
".section .altinstructions,\"a\"\n"
|
||
|
|
" .long 1b - .\n" /* src offset */
|
||
|
|
" .long 4f - .\n" /* repl offset */
|
||
|
|
" .word %P1\n" /* always replace */
|
||
|
|
" .byte 3b - 1b\n" /* src len */
|
||
|
|
" .byte 5f - 4f\n" /* repl len */
|
||
|
|
" .byte 3b - 2b\n" /* pad len */
|
||
|
|
".previous\n"
|
||
|
|
".section .altinstr_replacement,\"ax\"\n"
|
||
|
|
"4: jmp %l[t_no]\n"
|
||
|
|
"5:\n"
|
||
|
|
".previous\n"
|
||
|
|
".section .altinstructions,\"a\"\n"
|
||
|
|
" .long 1b - .\n" /* src offset */
|
||
|
|
" .long 0\n" /* no replacement */
|
||
|
|
" .word %P0\n" /* feature bit */
|
||
|
|
" .byte 3b - 1b\n" /* src len */
|
||
|
|
" .byte 0\n" /* repl len */
|
||
|
|
" .byte 0\n" /* pad len */
|
||
|
|
".previous\n"
|
||
|
|
".section .altinstr_aux,\"ax\"\n"
|
||
|
|
"6:\n"
|
||
|
|
" testb %[bitnum],%[cap_byte]\n"
|
||
|
|
" jnz %l[t_yes]\n"
|
||
|
|
" jmp %l[t_no]\n"
|
||
|
|
".previous\n"
|
||
|
|
: : "i" (bit), "i" (X86_FEATURE_ALWAYS),
|
||
|
|
[bitnum] "i" (1 << (bit & 7)),
|
||
|
|
[cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
|
||
|
|
: : t_yes, t_no);
|
||
|
|
t_yes:
|
||
|
|
return true;
|
||
|
|
t_no:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define static_cpu_has(bit) \
|
||
|
|
( \
|
||
|
|
__builtin_constant_p(boot_cpu_has(bit)) ? \
|
||
|
|
boot_cpu_has(bit) : \
|
||
|
|
_static_cpu_has(bit) \
|
||
|
|
)
|
||
|
|
#else
|
||
|
|
/*
|
||
|
|
* Fall back to dynamic for gcc versions which don't support asm goto. Should be
|
||
|
|
* a minority now anyway.
|
||
|
|
*/
|
||
|
|
#define static_cpu_has(bit) boot_cpu_has(bit)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define cpu_has_bug(c, bit) cpu_has(c, (bit))
|
||
|
|
#define set_cpu_bug(c, bit) set_cpu_cap(c, (bit))
|
||
|
|
#define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit))
|
||
|
|
|
||
|
|
#define static_cpu_has_bug(bit) static_cpu_has((bit))
|
||
|
|
#define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit))
|
||
|
|
|
||
|
|
#define MAX_CPU_FEATURES (NCAPINTS * 32)
|
||
|
|
#define cpu_have_feature boot_cpu_has
|
||
|
|
|
||
|
|
#define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X"
|
||
|
|
#define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
|
||
|
|
boot_cpu_data.x86_model
|
||
|
|
|
||
|
|
#endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
|
||
|
|
#endif /* _ASM_X86_CPUFEATURE_H */
|