Branch data     Line data    Source code

       1                 :            : // SPDX-License-Identifier: GPL-2.0
       2                 :            : #include <asm/cpu_device_id.h>
       3                 :            : #include <asm/cpufeature.h>
       4                 :            : #include <linux/cpu.h>
       5                 :            : #include <linux/export.h>
       6                 :            : #include <linux/slab.h>
       7                 :            : 
       8                 :            : /**
       9                 :            :  * x86_match_cpu - match current CPU again an array of x86_cpu_ids
      10                 :            :  * @match: Pointer to array of x86_cpu_ids. Last entry terminated with
      11                 :            :  *         {}.
      12                 :            :  *
      13                 :            :  * Return the entry if the current CPU matches the entries in the
      14                 :            :  * passed x86_cpu_id match table. Otherwise NULL.  The match table
      15                 :            :  * contains vendor (X86_VENDOR_*), family, model and feature bits or
      16                 :            :  * respective wildcard entries.
      17                 :            :  *
      18                 :            :  * A typical table entry would be to match a specific CPU
      19                 :            :  * { X86_VENDOR_INTEL, 6, 0x12 }
      20                 :            :  * or to match a specific CPU feature
      21                 :            :  * { X86_FEATURE_MATCH(X86_FEATURE_FOOBAR) }
      22                 :            :  *
      23                 :            :  * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY,
      24                 :            :  * %X86_MODEL_ANY, %X86_FEATURE_ANY or 0 (except for vendor)
      25                 :            :  *
      26                 :            :  * Arrays used to match for this should also be declared using
      27                 :            :  * MODULE_DEVICE_TABLE(x86cpu, ...)
      28                 :            :  *
      29                 :            :  * This always matches against the boot cpu, assuming models and features are
      30                 :            :  * consistent over all CPUs.
      31                 :            :  */
      32                 :        280 : const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
      33                 :            : {
      34                 :        280 :         const struct x86_cpu_id *m;
      35                 :        280 :         struct cpuinfo_x86 *c = &boot_cpu_data;
      36                 :            : 
      37         [ +  + ]:       7000 :         for (m = match; m->vendor | m->family | m->model | m->feature; m++) {
      38   [ +  +  +  + ]:       6916 :                 if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor)
      39                 :       5684 :                         continue;
      40   [ +  +  +  - ]:       1232 :                 if (m->family != X86_FAMILY_ANY && c->x86 != m->family)
      41                 :       1036 :                         continue;
      42   [ -  +  -  - ]:        196 :                 if (m->model != X86_MODEL_ANY && c->x86_model != m->model)
      43                 :          0 :                         continue;
      44   [ -  +  -  -  :        196 :                 if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature))
          -  -  -  -  -  
          -  -  -  -  -  
          -  -  -  -  -  
                      - ]
      45                 :          0 :                         continue;
      46                 :            :                 return m;
      47                 :            :         }
      48                 :            :         return NULL;
      49                 :            : }
      50                 :            : EXPORT_SYMBOL(x86_match_cpu);
      51                 :            : 
      52                 :            : static const struct x86_cpu_desc *
      53                 :          0 : x86_match_cpu_with_stepping(const struct x86_cpu_desc *match)
      54                 :            : {
      55                 :          0 :         struct cpuinfo_x86 *c = &boot_cpu_data;
      56                 :          0 :         const struct x86_cpu_desc *m;
      57                 :            : 
      58         [ #  # ]:          0 :         for (m = match; m->x86_family | m->x86_model; m++) {
      59         [ #  # ]:          0 :                 if (c->x86_vendor != m->x86_vendor)
      60                 :          0 :                         continue;
      61         [ #  # ]:          0 :                 if (c->x86 != m->x86_family)
      62                 :          0 :                         continue;
      63         [ #  # ]:          0 :                 if (c->x86_model != m->x86_model)
      64                 :          0 :                         continue;
      65         [ #  # ]:          0 :                 if (c->x86_stepping != m->x86_stepping)
      66                 :          0 :                         continue;
      67                 :            :                 return m;
      68                 :            :         }
      69                 :            :         return NULL;
      70                 :            : }
      71                 :            : 
      72                 :          0 : bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table)
      73                 :            : {
      74                 :          0 :         const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table);
      75                 :            : 
      76   [ #  #  #  # ]:          0 :         if (!res || res->x86_microcode_rev > boot_cpu_data.microcode)
      77                 :          0 :                 return false;
      78                 :            : 
      79                 :            :         return true;
      80                 :            : }
      81                 :            : EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev);