Contributors: 24
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Borislav Petkov |
122 |
31.52% |
11 |
20.37% |
| Brian Gerst |
59 |
15.25% |
2 |
3.70% |
| H. Peter Anvin |
42 |
10.85% |
6 |
11.11% |
| Andi Kleen |
40 |
10.34% |
6 |
11.11% |
| Linus Torvalds |
17 |
4.39% |
1 |
1.85% |
| Ard Biesheuvel |
15 |
3.88% |
1 |
1.85% |
| Ingo Molnar |
13 |
3.36% |
3 |
5.56% |
| Dave Hansen |
11 |
2.84% |
2 |
3.70% |
| Thomas Gleixner |
9 |
2.33% |
2 |
3.70% |
| Christoph Lameter |
8 |
2.07% |
1 |
1.85% |
| Brendan Jackman |
7 |
1.81% |
1 |
1.85% |
| Jeremy Fitzhardinge |
7 |
1.81% |
1 |
1.85% |
| Juergen Gross |
7 |
1.81% |
1 |
1.85% |
| Sean Christopherson |
6 |
1.55% |
2 |
3.70% |
| Sohil Mehta |
4 |
1.03% |
1 |
1.85% |
| Jan Beulich |
4 |
1.03% |
1 |
1.85% |
| Uros Bizjak |
3 |
0.78% |
3 |
5.56% |
| Yazen Ghannam |
2 |
0.52% |
1 |
1.85% |
| Peter Zijlstra |
2 |
0.52% |
2 |
3.70% |
| Fenghua Yu |
2 |
0.52% |
2 |
3.70% |
| Kim Phillips |
2 |
0.52% |
1 |
1.85% |
| David Woodhouse |
2 |
0.52% |
1 |
1.85% |
| Thomas Huth |
2 |
0.52% |
1 |
1.85% |
| Greg Kroah-Hartman |
1 |
0.26% |
1 |
1.85% |
| Total |
387 |
|
54 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_CPUFEATURE_H
#define _ASM_X86_CPUFEATURE_H
#include <asm/processor.h>
#if defined(__KERNEL__) && !defined(__ASSEMBLER__)
#include <asm/asm.h>
#include <linux/bitops.h>
#include <asm/alternative.h>
#include <asm/cpufeaturemasks.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_LNX_4,
CPUID_7_1_EAX,
CPUID_8000_0008_EBX,
CPUID_6_EAX,
CPUID_8000_000A_EDX,
CPUID_7_ECX,
CPUID_8000_0007_EBX,
CPUID_7_EDX,
CPUID_8000_001F_EAX,
CPUID_8000_0021_EAX,
CPUID_LNX_5,
NR_CPUID_WORDS,
};
extern const char * const x86_cap_flags[NCAPINTS*32];
extern const char * const x86_power_flags[32];
/*
* 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 x86_bug_flag(flag) x86_bug_flags[flag]
#define test_cpu_cap(c, bit) \
arch_test_bit(bit, (unsigned long *)((c)->x86_capability))
#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, cpu_info.x86_capability))
/*
* This is the default CPU features testing macro to use in code.
*
* It 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))
extern void setup_clear_cpu_cap(unsigned int bit);
extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit);
void check_cpufeature_deps(struct cpuinfo_x86 *c);
#define setup_force_cpu_cap(bit) do { \
\
if (!boot_cpu_has(bit)) \
WARN_ON(alternatives_patched); \
\
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)
/*
* Do not use an "m" constraint for [cap_byte] here: gcc doesn't know
* that this is only used on a fallback path and will sometimes cause
* it to manifest the address of boot_cpu_data in a register, fouling
* the mainline (post-initialization) code.
*/
static __always_inline bool _static_cpu_has(u16 bit)
{
asm goto(ALTERNATIVE_TERNARY("jmp 6f", %c[feature], "", "jmp %l[t_no]")
".pushsection .altinstr_aux,\"ax\"\n"
"6:\n"
" testb %[bitnum], %a[cap_byte]\n"
" jnz %l[t_yes]\n"
" jmp %l[t_no]\n"
".popsection\n"
: : [feature] "i" (bit),
[bitnum] "i" (1 << (bit & 7)),
[cap_byte] "i" (&((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) \
)
#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 boot_cpu_set_bug(bit) set_cpu_cap(&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(__ASSEMBLER__) */
#endif /* _ASM_X86_CPUFEATURE_H */