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Linux/arch/x86/include/asm/cpufeature.h

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  1 #ifndef _ASM_X86_CPUFEATURE_H
  2 #define _ASM_X86_CPUFEATURE_H
  3 
  4 #include <asm/processor.h>
  5 
  6 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
  7 
  8 #include <asm/asm.h>
  9 #include <linux/bitops.h>
 10 
 11 enum cpuid_leafs
 12 {
 13         CPUID_1_EDX             = 0,
 14         CPUID_8000_0001_EDX,
 15         CPUID_8086_0001_EDX,
 16         CPUID_LNX_1,
 17         CPUID_1_ECX,
 18         CPUID_C000_0001_EDX,
 19         CPUID_8000_0001_ECX,
 20         CPUID_LNX_2,
 21         CPUID_LNX_3,
 22         CPUID_7_0_EBX,
 23         CPUID_D_1_EAX,
 24         CPUID_F_0_EDX,
 25         CPUID_F_1_EDX,
 26         CPUID_8000_0008_EBX,
 27         CPUID_6_EAX,
 28         CPUID_8000_000A_EDX,
 29         CPUID_7_ECX,
 30         CPUID_8000_0007_EBX,
 31 };
 32 
 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]
 38 #else
 39 #define X86_CAP_FMT "%d:%d"
 40 #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
 41 #endif
 42 
 43 /*
 44  * In order to save room, we index into this array by doing
 45  * X86_BUG_<name> - NCAPINTS*32.
 46  */
 47 extern const char * const x86_bug_flags[NBUGINTS*32];
 48 
 49 #define test_cpu_cap(c, bit)                                            \
 50          test_bit(bit, (unsigned long *)((c)->x86_capability))
 51 
 52 /*
 53  * There are 32 bits/features in each mask word.  The high bits
 54  * (selected with (bit>>5) give us the word number and the low 5
 55  * bits give us the bit/feature number inside the word.
 56  * (1UL<<((bit)&31) gives us a mask for the feature_bit so we can
 57  * see if it is set in the mask word.
 58  */
 59 #define CHECK_BIT_IN_MASK_WORD(maskname, word, bit)     \
 60         (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word ))
 61 
 62 #define REQUIRED_MASK_BIT_SET(feature_bit)              \
 63          ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  0, feature_bit) ||    \
 64            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  1, feature_bit) ||    \
 65            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  2, feature_bit) ||    \
 66            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  3, feature_bit) ||    \
 67            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  4, feature_bit) ||    \
 68            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  5, feature_bit) ||    \
 69            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  6, feature_bit) ||    \
 70            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  7, feature_bit) ||    \
 71            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  8, feature_bit) ||    \
 72            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  9, feature_bit) ||    \
 73            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) ||    \
 74            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) ||    \
 75            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) ||    \
 76            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) ||    \
 77            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) ||    \
 78            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) ||    \
 79            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) ||    \
 80            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) ||    \
 81            REQUIRED_MASK_CHECK                                    ||    \
 82            BUILD_BUG_ON_ZERO(NCAPINTS != 18))
 83 
 84 #define DISABLED_MASK_BIT_SET(feature_bit)                              \
 85          ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  0, feature_bit) ||    \
 86            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  1, feature_bit) ||    \
 87            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  2, feature_bit) ||    \
 88            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  3, feature_bit) ||    \
 89            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  4, feature_bit) ||    \
 90            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  5, feature_bit) ||    \
 91            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  6, feature_bit) ||    \
 92            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  7, feature_bit) ||    \
 93            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  8, feature_bit) ||    \
 94            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  9, feature_bit) ||    \
 95            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) ||    \
 96            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) ||    \
 97            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) ||    \
 98            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) ||    \
 99            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) ||    \
100            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) ||    \
101            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) ||    \
102            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) ||    \
103            DISABLED_MASK_CHECK                                    ||    \
104            BUILD_BUG_ON_ZERO(NCAPINTS != 18))
105 
106 #define cpu_has(c, bit)                                                 \
107         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
108          test_cpu_cap(c, bit))
109 
110 #define this_cpu_has(bit)                                               \
111         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
112          x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
113 
114 /*
115  * This macro is for detection of features which need kernel
116  * infrastructure to be used.  It may *not* directly test the CPU
117  * itself.  Use the cpu_has() family if you want true runtime
118  * testing of CPU features, like in hypervisor code where you are
119  * supporting a possible guest feature where host support for it
120  * is not relevant.
121  */
122 #define cpu_feature_enabled(bit)        \
123         (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
124 
125 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
126 
127 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability))
128 #define clear_cpu_cap(c, bit)   clear_bit(bit, (unsigned long *)((c)->x86_capability))
129 #define setup_clear_cpu_cap(bit) do { \
130         clear_cpu_cap(&boot_cpu_data, bit);     \
131         set_bit(bit, (unsigned long *)cpu_caps_cleared); \
132 } while (0)
133 #define setup_force_cpu_cap(bit) do { \
134         set_cpu_cap(&boot_cpu_data, bit);       \
135         set_bit(bit, (unsigned long *)cpu_caps_set);    \
136 } while (0)
137 
138 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
139 /*
140  * Static testing of CPU features.  Used the same as boot_cpu_has().
141  * These will statically patch the target code for additional
142  * performance.
143  */
144 static __always_inline __pure bool _static_cpu_has(u16 bit)
145 {
146                 asm_volatile_goto("1: jmp 6f\n"
147                          "2:\n"
148                          ".skip -(((5f-4f) - (2b-1b)) > 0) * "
149                                  "((5f-4f) - (2b-1b)),0x90\n"
150                          "3:\n"
151                          ".section .altinstructions,\"a\"\n"
152                          " .long 1b - .\n"              /* src offset */
153                          " .long 4f - .\n"              /* repl offset */
154                          " .word %P1\n"                 /* always replace */
155                          " .byte 3b - 1b\n"             /* src len */
156                          " .byte 5f - 4f\n"             /* repl len */
157                          " .byte 3b - 2b\n"             /* pad len */
158                          ".previous\n"
159                          ".section .altinstr_replacement,\"ax\"\n"
160                          "4: jmp %l[t_no]\n"
161                          "5:\n"
162                          ".previous\n"
163                          ".section .altinstructions,\"a\"\n"
164                          " .long 1b - .\n"              /* src offset */
165                          " .long 0\n"                   /* no replacement */
166                          " .word %P0\n"                 /* feature bit */
167                          " .byte 3b - 1b\n"             /* src len */
168                          " .byte 0\n"                   /* repl len */
169                          " .byte 0\n"                   /* pad len */
170                          ".previous\n"
171                          ".section .altinstr_aux,\"ax\"\n"
172                          "6:\n"
173                          " testb %[bitnum],%[cap_byte]\n"
174                          " jnz %l[t_yes]\n"
175                          " jmp %l[t_no]\n"
176                          ".previous\n"
177                          : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
178                              [bitnum] "i" (1 << (bit & 7)),
179                              [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
180                          : : t_yes, t_no);
181         t_yes:
182                 return true;
183         t_no:
184                 return false;
185 }
186 
187 #define static_cpu_has(bit)                                     \
188 (                                                               \
189         __builtin_constant_p(boot_cpu_has(bit)) ?               \
190                 boot_cpu_has(bit) :                             \
191                 _static_cpu_has(bit)                            \
192 )
193 #else
194 /*
195  * Fall back to dynamic for gcc versions which don't support asm goto. Should be
196  * a minority now anyway.
197  */
198 #define static_cpu_has(bit)             boot_cpu_has(bit)
199 #endif
200 
201 #define cpu_has_bug(c, bit)             cpu_has(c, (bit))
202 #define set_cpu_bug(c, bit)             set_cpu_cap(c, (bit))
203 #define clear_cpu_bug(c, bit)           clear_cpu_cap(c, (bit))
204 
205 #define static_cpu_has_bug(bit)         static_cpu_has((bit))
206 #define boot_cpu_has_bug(bit)           cpu_has_bug(&boot_cpu_data, (bit))
207 #define boot_cpu_set_bug(bit)           set_cpu_cap(&boot_cpu_data, (bit))
208 
209 #define MAX_CPU_FEATURES                (NCAPINTS * 32)
210 #define cpu_have_feature                boot_cpu_has
211 
212 #define CPU_FEATURE_TYPEFMT             "x86,ven%04Xfam%04Xmod%04X"
213 #define CPU_FEATURE_TYPEVAL             boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
214                                         boot_cpu_data.x86_model
215 
216 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
217 #endif /* _ASM_X86_CPUFEATURE_H */
218 

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