| 1 | |
| 2 | #include <asm/cpu_device_id.h>
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| 3 | #include <asm/cpufeature.h>
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| 4 | #include <linux/cpu.h>
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| 5 | #include <linux/export.h>
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| 6 | #include <linux/slab.h>
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| 7 |
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| 8 | |
| 9 | * x86_match_cpu - match current CPU against an array of x86_cpu_ids
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| 10 | * @match: Pointer to array of x86_cpu_ids. Last entry terminated with
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| 11 | * {}.
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| 12 | *
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| 13 | * Return the entry if the current CPU matches the entries in the
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| 14 | * passed x86_cpu_id match table. Otherwise NULL. The match table
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| 15 | * contains vendor (X86_VENDOR_*), family, model and feature bits or
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| 16 | * respective wildcard entries.
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| 17 | *
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| 18 | * A typical table entry would be to match a specific CPU
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| 19 | *
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| 20 | * X86_MATCH_VFM_FEATURE(INTEL_BROADWELL, X86_FEATURE_ANY, NULL);
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| 21 | *
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| 22 | * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY,
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| 23 | * %X86_MODEL_ANY, %X86_FEATURE_ANY (except for vendor)
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| 24 | *
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| 25 | * asm/cpu_device_id.h contains a set of useful macros which are shortcuts
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| 26 | * for various common selections. The above can be shortened to:
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| 27 | *
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| 28 | * X86_MATCH_VFM(INTEL_BROADWELL, NULL);
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| 29 | *
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| 30 | * Arrays used to match for this should also be declared using
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| 31 | * MODULE_DEVICE_TABLE(x86cpu, ...)
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| 32 | *
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| 33 | * This always matches against the boot cpu, assuming models and features are
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| 34 | * consistent over all CPUs.
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| 35 |
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| 36 | const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
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| 37 | {
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| 38 | const struct x86_cpu_id *m;
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| 39 | struct cpuinfo_x86 *c = &boot_cpu_data;
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| 40 |
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| 41 | for (m = match; m->flags & X86_CPU_ID_FLAG_ENTRY_VALID; m++) {
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| 42 | if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor)
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| 43 | continue;
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| 44 | if (m->family != X86_FAMILY_ANY && c->x86 != m->family)
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| 45 | continue;
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| 46 | if (m->model != X86_MODEL_ANY && c->x86_model != m->model)
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| 47 | continue;
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| 48 | if (m->steppings != X86_STEPPING_ANY &&
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| 49 | !(BIT(c->x86_stepping) & m->steppings))
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| 50 | continue;
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| 51 | if (m->platform_mask != X86_PLATFORM_ANY &&
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| 52 | !(BIT(c->intel_platform_id) & m->platform_mask))
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| 53 | continue;
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| 54 | if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature))
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| 55 | continue;
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| 56 | if (m->type != X86_CPU_TYPE_ANY && c->topo.cpu_type != m->type)
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| 57 | continue;
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| 58 | return m;
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| 59 | }
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| 60 | return NULL;
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| 61 | }
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| 62 | EXPORT_SYMBOL(x86_match_cpu);
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| 63 |
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| 64 | bool x86_match_min_microcode_rev(const struct x86_cpu_id *table)
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| 65 | {
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| 66 | const struct x86_cpu_id *res = x86_match_cpu(table);
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| 67 |
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| 68 | if (!res || res->driver_data > boot_cpu_data.microcode)
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| 69 | return false;
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| 70 |
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| 71 | return true;
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| 72 | }
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| 73 | EXPORT_SYMBOL_GPL(x86_match_min_microcode_rev);
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