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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/cpufeature.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_X86_CPUFEATURE_H
  3 #define _ASM_X86_CPUFEATURE_H
  4 
  5 #include <asm/processor.h>
  6 
  7 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
  8 
  9 #include <asm/asm.h>
 10 #include <linux/bitops.h>
 11 
 12 enum cpuid_leafs
 13 {
 14         CPUID_1_EDX             = 0,
 15         CPUID_8000_0001_EDX,
 16         CPUID_8086_0001_EDX,
 17         CPUID_LNX_1,
 18         CPUID_1_ECX,
 19         CPUID_C000_0001_EDX,
 20         CPUID_8000_0001_ECX,
 21         CPUID_LNX_2,
 22         CPUID_LNX_3,
 23         CPUID_7_0_EBX,
 24         CPUID_D_1_EAX,
 25         CPUID_F_0_EDX,
 26         CPUID_F_1_EDX,
 27         CPUID_8000_0008_EBX,
 28         CPUID_6_EAX,
 29         CPUID_8000_000A_EDX,
 30         CPUID_7_ECX,
 31         CPUID_8000_0007_EBX,
 32         CPUID_7_EDX,
 33 };
 34 
 35 #ifdef CONFIG_X86_FEATURE_NAMES
 36 extern const char * const x86_cap_flags[NCAPINTS*32];
 37 extern const char * const x86_power_flags[32];
 38 #define X86_CAP_FMT "%s"
 39 #define x86_cap_flag(flag) x86_cap_flags[flag]
 40 #else
 41 #define X86_CAP_FMT "%d:%d"
 42 #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
 43 #endif
 44 
 45 /*
 46  * In order to save room, we index into this array by doing
 47  * X86_BUG_<name> - NCAPINTS*32.
 48  */
 49 extern const char * const x86_bug_flags[NBUGINTS*32];
 50 
 51 #define test_cpu_cap(c, bit)                                            \
 52          test_bit(bit, (unsigned long *)((c)->x86_capability))
 53 
 54 /*
 55  * There are 32 bits/features in each mask word.  The high bits
 56  * (selected with (bit>>5) give us the word number and the low 5
 57  * bits give us the bit/feature number inside the word.
 58  * (1UL<<((bit)&31) gives us a mask for the feature_bit so we can
 59  * see if it is set in the mask word.
 60  */
 61 #define CHECK_BIT_IN_MASK_WORD(maskname, word, bit)     \
 62         (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word ))
 63 
 64 #define REQUIRED_MASK_BIT_SET(feature_bit)              \
 65          ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  0, feature_bit) ||    \
 66            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  1, feature_bit) ||    \
 67            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  2, feature_bit) ||    \
 68            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  3, feature_bit) ||    \
 69            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  4, feature_bit) ||    \
 70            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  5, feature_bit) ||    \
 71            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  6, feature_bit) ||    \
 72            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  7, feature_bit) ||    \
 73            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  8, feature_bit) ||    \
 74            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK,  9, feature_bit) ||    \
 75            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) ||    \
 76            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) ||    \
 77            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) ||    \
 78            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) ||    \
 79            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) ||    \
 80            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) ||    \
 81            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) ||    \
 82            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) ||    \
 83            CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) ||    \
 84            REQUIRED_MASK_CHECK                                    ||    \
 85            BUILD_BUG_ON_ZERO(NCAPINTS != 19))
 86 
 87 #define DISABLED_MASK_BIT_SET(feature_bit)                              \
 88          ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  0, feature_bit) ||    \
 89            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  1, feature_bit) ||    \
 90            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  2, feature_bit) ||    \
 91            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  3, feature_bit) ||    \
 92            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  4, feature_bit) ||    \
 93            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  5, feature_bit) ||    \
 94            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  6, feature_bit) ||    \
 95            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  7, feature_bit) ||    \
 96            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  8, feature_bit) ||    \
 97            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK,  9, feature_bit) ||    \
 98            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) ||    \
 99            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) ||    \
100            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) ||    \
101            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) ||    \
102            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) ||    \
103            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) ||    \
104            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) ||    \
105            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) ||    \
106            CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) ||    \
107            DISABLED_MASK_CHECK                                    ||    \
108            BUILD_BUG_ON_ZERO(NCAPINTS != 19))
109 
110 #define cpu_has(c, bit)                                                 \
111         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
112          test_cpu_cap(c, bit))
113 
114 #define this_cpu_has(bit)                                               \
115         (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 :  \
116          x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
117 
118 /*
119  * This macro is for detection of features which need kernel
120  * infrastructure to be used.  It may *not* directly test the CPU
121  * itself.  Use the cpu_has() family if you want true runtime
122  * testing of CPU features, like in hypervisor code where you are
123  * supporting a possible guest feature where host support for it
124  * is not relevant.
125  */
126 #define cpu_feature_enabled(bit)        \
127         (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
128 
129 #define boot_cpu_has(bit)       cpu_has(&boot_cpu_data, bit)
130 
131 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability))
132 
133 extern void setup_clear_cpu_cap(unsigned int bit);
134 extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit);
135 
136 #define setup_force_cpu_cap(bit) do { \
137         set_cpu_cap(&boot_cpu_data, bit);       \
138         set_bit(bit, (unsigned long *)cpu_caps_set);    \
139 } while (0)
140 
141 #define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit)
142 
143 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS)
144 /*
145  * Static testing of CPU features.  Used the same as boot_cpu_has().
146  * These will statically patch the target code for additional
147  * performance.
148  */
149 static __always_inline __pure bool _static_cpu_has(u16 bit)
150 {
151                 asm_volatile_goto("1: jmp 6f\n"
152                          "2:\n"
153                          ".skip -(((5f-4f) - (2b-1b)) > 0) * "
154                                  "((5f-4f) - (2b-1b)),0x90\n"
155                          "3:\n"
156                          ".section .altinstructions,\"a\"\n"
157                          " .long 1b - .\n"              /* src offset */
158                          " .long 4f - .\n"              /* repl offset */
159                          " .word %P1\n"                 /* always replace */
160                          " .byte 3b - 1b\n"             /* src len */
161                          " .byte 5f - 4f\n"             /* repl len */
162                          " .byte 3b - 2b\n"             /* pad len */
163                          ".previous\n"
164                          ".section .altinstr_replacement,\"ax\"\n"
165                          "4: jmp %l[t_no]\n"
166                          "5:\n"
167                          ".previous\n"
168                          ".section .altinstructions,\"a\"\n"
169                          " .long 1b - .\n"              /* src offset */
170                          " .long 0\n"                   /* no replacement */
171                          " .word %P0\n"                 /* feature bit */
172                          " .byte 3b - 1b\n"             /* src len */
173                          " .byte 0\n"                   /* repl len */
174                          " .byte 0\n"                   /* pad len */
175                          ".previous\n"
176                          ".section .altinstr_aux,\"ax\"\n"
177                          "6:\n"
178                          " testb %[bitnum],%[cap_byte]\n"
179                          " jnz %l[t_yes]\n"
180                          " jmp %l[t_no]\n"
181                          ".previous\n"
182                          : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
183                              [bitnum] "i" (1 << (bit & 7)),
184                              [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
185                          : : t_yes, t_no);
186         t_yes:
187                 return true;
188         t_no:
189                 return false;
190 }
191 
192 #define static_cpu_has(bit)                                     \
193 (                                                               \
194         __builtin_constant_p(boot_cpu_has(bit)) ?               \
195                 boot_cpu_has(bit) :                             \
196                 _static_cpu_has(bit)                            \
197 )
198 #else
199 /*
200  * Fall back to dynamic for gcc versions which don't support asm goto. Should be
201  * a minority now anyway.
202  */
203 #define static_cpu_has(bit)             boot_cpu_has(bit)
204 #endif
205 
206 #define cpu_has_bug(c, bit)             cpu_has(c, (bit))
207 #define set_cpu_bug(c, bit)             set_cpu_cap(c, (bit))
208 #define clear_cpu_bug(c, bit)           clear_cpu_cap(c, (bit))
209 
210 #define static_cpu_has_bug(bit)         static_cpu_has((bit))
211 #define boot_cpu_has_bug(bit)           cpu_has_bug(&boot_cpu_data, (bit))
212 #define boot_cpu_set_bug(bit)           set_cpu_cap(&boot_cpu_data, (bit))
213 
214 #define MAX_CPU_FEATURES                (NCAPINTS * 32)
215 #define cpu_have_feature                boot_cpu_has
216 
217 #define CPU_FEATURE_TYPEFMT             "x86,ven%04Xfam%04Xmod%04X"
218 #define CPU_FEATURE_TYPEVAL             boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
219                                         boot_cpu_data.x86_model
220 
221 #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
222 #endif /* _ASM_X86_CPUFEATURE_H */
223 

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