1 #ifndef _ASM_X86_CPUFEATURE_H
2 #define _ASM_X86_CPUFEATURE_H
4 #include <asm/processor.h>
6 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
9 #include <linux/bitops.h>
33 #ifdef CONFIG_X86_FEATURE_NAMES
34 extern const char * const x86_cap_flags[NCAPINTS*32];
35 extern const char * const x86_power_flags[32];
36 #define X86_CAP_FMT "%s"
37 #define x86_cap_flag(flag) x86_cap_flags[flag]
39 #define X86_CAP_FMT "%d:%d"
40 #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
44 * In order to save room, we index into this array by doing
45 * X86_BUG_<name> - NCAPINTS*32.
47 extern const char * const x86_bug_flags[NBUGINTS*32];
49 #define test_cpu_cap(c, bit) \
50 test_bit(bit, (unsigned long *)((c)->x86_capability))
52 #define REQUIRED_MASK_BIT_SET(bit) \
53 ( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0 )) || \
54 (((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1 )) || \
55 (((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2 )) || \
56 (((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3 )) || \
57 (((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4 )) || \
58 (((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5 )) || \
59 (((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6 )) || \
60 (((bit)>>5)==7 && (1UL<<((bit)&31) & REQUIRED_MASK7 )) || \
61 (((bit)>>5)==8 && (1UL<<((bit)&31) & REQUIRED_MASK8 )) || \
62 (((bit)>>5)==9 && (1UL<<((bit)&31) & REQUIRED_MASK9 )) || \
63 (((bit)>>5)==10 && (1UL<<((bit)&31) & REQUIRED_MASK10)) || \
64 (((bit)>>5)==11 && (1UL<<((bit)&31) & REQUIRED_MASK11)) || \
65 (((bit)>>5)==12 && (1UL<<((bit)&31) & REQUIRED_MASK12)) || \
66 (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK13)) || \
67 (((bit)>>5)==14 && (1UL<<((bit)&31) & REQUIRED_MASK14)) || \
68 (((bit)>>5)==15 && (1UL<<((bit)&31) & REQUIRED_MASK15)) || \
69 (((bit)>>5)==16 && (1UL<<((bit)&31) & REQUIRED_MASK16)) || \
70 (((bit)>>5)==17 && (1UL<<((bit)&31) & REQUIRED_MASK17)) || \
71 REQUIRED_MASK_CHECK || \
72 BUILD_BUG_ON_ZERO(NCAPINTS != 18))
74 #define DISABLED_MASK_BIT_SET(bit) \
75 ( (((bit)>>5)==0 && (1UL<<((bit)&31) & DISABLED_MASK0 )) || \
76 (((bit)>>5)==1 && (1UL<<((bit)&31) & DISABLED_MASK1 )) || \
77 (((bit)>>5)==2 && (1UL<<((bit)&31) & DISABLED_MASK2 )) || \
78 (((bit)>>5)==3 && (1UL<<((bit)&31) & DISABLED_MASK3 )) || \
79 (((bit)>>5)==4 && (1UL<<((bit)&31) & DISABLED_MASK4 )) || \
80 (((bit)>>5)==5 && (1UL<<((bit)&31) & DISABLED_MASK5 )) || \
81 (((bit)>>5)==6 && (1UL<<((bit)&31) & DISABLED_MASK6 )) || \
82 (((bit)>>5)==7 && (1UL<<((bit)&31) & DISABLED_MASK7 )) || \
83 (((bit)>>5)==8 && (1UL<<((bit)&31) & DISABLED_MASK8 )) || \
84 (((bit)>>5)==9 && (1UL<<((bit)&31) & DISABLED_MASK9 )) || \
85 (((bit)>>5)==10 && (1UL<<((bit)&31) & DISABLED_MASK10)) || \
86 (((bit)>>5)==11 && (1UL<<((bit)&31) & DISABLED_MASK11)) || \
87 (((bit)>>5)==12 && (1UL<<((bit)&31) & DISABLED_MASK12)) || \
88 (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK13)) || \
89 (((bit)>>5)==14 && (1UL<<((bit)&31) & DISABLED_MASK14)) || \
90 (((bit)>>5)==15 && (1UL<<((bit)&31) & DISABLED_MASK15)) || \
91 (((bit)>>5)==16 && (1UL<<((bit)&31) & DISABLED_MASK16)) || \
92 (((bit)>>5)==17 && (1UL<<((bit)&31) & DISABLED_MASK17)) || \
93 DISABLED_MASK_CHECK || \
94 BUILD_BUG_ON_ZERO(NCAPINTS != 18))
96 #define cpu_has(c, bit) \
97 (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
100 #define this_cpu_has(bit) \
101 (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
102 x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
105 * This macro is for detection of features which need kernel
106 * infrastructure to be used. It may *not* directly test the CPU
107 * itself. Use the cpu_has() family if you want true runtime
108 * testing of CPU features, like in hypervisor code where you are
109 * supporting a possible guest feature where host support for it
112 #define cpu_feature_enabled(bit) \
113 (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
115 #define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit)
117 #define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability))
118 #define clear_cpu_cap(c, bit) clear_bit(bit, (unsigned long *)((c)->x86_capability))
119 #define setup_clear_cpu_cap(bit) do { \
120 clear_cpu_cap(&boot_cpu_data, bit); \
121 set_bit(bit, (unsigned long *)cpu_caps_cleared); \
123 #define setup_force_cpu_cap(bit) do { \
124 set_cpu_cap(&boot_cpu_data, bit); \
125 set_bit(bit, (unsigned long *)cpu_caps_set); \
128 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
130 * Static testing of CPU features. Used the same as boot_cpu_has().
131 * These will statically patch the target code for additional
134 static __always_inline __pure bool _static_cpu_has(u16 bit)
136 asm_volatile_goto("1: jmp 6f\n"
138 ".skip -(((5f-4f) - (2b-1b)) > 0) * "
139 "((5f-4f) - (2b-1b)),0x90\n"
141 ".section .altinstructions,\"a\"\n"
142 " .long 1b - .\n" /* src offset */
143 " .long 4f - .\n" /* repl offset */
144 " .word %P1\n" /* always replace */
145 " .byte 3b - 1b\n" /* src len */
146 " .byte 5f - 4f\n" /* repl len */
147 " .byte 3b - 2b\n" /* pad len */
149 ".section .altinstr_replacement,\"ax\"\n"
153 ".section .altinstructions,\"a\"\n"
154 " .long 1b - .\n" /* src offset */
155 " .long 0\n" /* no replacement */
156 " .word %P0\n" /* feature bit */
157 " .byte 3b - 1b\n" /* src len */
158 " .byte 0\n" /* repl len */
159 " .byte 0\n" /* pad len */
161 ".section .altinstr_aux,\"ax\"\n"
163 " testb %[bitnum],%[cap_byte]\n"
167 : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
168 [bitnum] "i" (1 << (bit & 7)),
169 [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
177 #define static_cpu_has(bit) \
179 __builtin_constant_p(boot_cpu_has(bit)) ? \
180 boot_cpu_has(bit) : \
181 _static_cpu_has(bit) \
185 * Fall back to dynamic for gcc versions which don't support asm goto. Should be
186 * a minority now anyway.
188 #define static_cpu_has(bit) boot_cpu_has(bit)
191 #define cpu_has_bug(c, bit) cpu_has(c, (bit))
192 #define set_cpu_bug(c, bit) set_cpu_cap(c, (bit))
193 #define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit))
195 #define static_cpu_has_bug(bit) static_cpu_has((bit))
196 #define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit))
198 #define MAX_CPU_FEATURES (NCAPINTS * 32)
199 #define cpu_have_feature boot_cpu_has
201 #define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X"
202 #define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
203 boot_cpu_data.x86_model
205 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
206 #endif /* _ASM_X86_CPUFEATURE_H */