| /* SPDX-License-Identifier: GPL-2.0 */ |
| #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> |
| #include <asm/alternative.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, |
| }; |
| |
| #define X86_CAP_FMT_NUM "%d:%d" |
| #define x86_cap_flag_num(flag) ((flag) >> 5), ((flag) & 31) |
| |
| 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] |
| |
| /* |
| * 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) \ |
| arch_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 )) |
| |
| /* |
| * {REQUIRED,DISABLED}_MASK_CHECK below may seem duplicated with the |
| * following BUILD_BUG_ON_ZERO() check but when NCAPINTS gets changed, all |
| * header macros which use NCAPINTS need to be changed. The duplicated macro |
| * use causes the compiler to issue errors for all headers so that all usage |
| * sites can be corrected. |
| */ |
| #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) || \ |
| CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 19, feature_bit) || \ |
| CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 20, feature_bit) || \ |
| CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 21, feature_bit) || \ |
| REQUIRED_MASK_CHECK || \ |
| BUILD_BUG_ON_ZERO(NCAPINTS != 22)) |
| |
| #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) || \ |
| CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 19, feature_bit) || \ |
| CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 20, feature_bit) || \ |
| CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 21, feature_bit) || \ |
| DISABLED_MASK_CHECK || \ |
| BUILD_BUG_ON_ZERO(NCAPINTS != 22)) |
| |
| #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 __percpu *)&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)) |
| |
| extern void setup_clear_cpu_cap(unsigned int bit); |
| extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit); |
| |
| #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) |
| |
| /* |
| * Static testing of CPU features. Used the same as boot_cpu_has(). It |
| * statically patches the target code for additional performance. Use |
| * static_cpu_has() only in fast paths, where every cycle counts. Which |
| * means that the boot_cpu_has() variant is already fast enough for the |
| * majority of cases and you should stick to using it as it is generally |
| * only two instructions: a RIP-relative MOV and a TEST. |
| * |
| * 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", %P[feature], "", "jmp %l[t_no]") |
| ".pushsection .altinstr_aux,\"ax\"\n" |
| "6:\n" |
| " testb %[bitnum]," _ASM_RIP(%P[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(__ASSEMBLY__) */ |
| #endif /* _ASM_X86_CPUFEATURE_H */ |