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91 lines
2.7 KiB
91 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <asm/cpu_device_id.h> |
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#include <asm/cpufeature.h> |
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#include <linux/cpu.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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/** |
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* x86_match_cpu - match current CPU again an array of x86_cpu_ids |
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* @match: Pointer to array of x86_cpu_ids. Last entry terminated with |
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* {}. |
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* |
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* Return the entry if the current CPU matches the entries in the |
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* passed x86_cpu_id match table. Otherwise NULL. The match table |
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* contains vendor (X86_VENDOR_*), family, model and feature bits or |
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* respective wildcard entries. |
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* |
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* A typical table entry would be to match a specific CPU |
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* |
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* X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_BROADWELL, |
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* X86_FEATURE_ANY, NULL); |
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* |
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* Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY, |
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* %X86_MODEL_ANY, %X86_FEATURE_ANY (except for vendor) |
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* |
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* asm/cpu_device_id.h contains a set of useful macros which are shortcuts |
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* for various common selections. The above can be shortened to: |
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* |
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* X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, NULL); |
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* |
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* Arrays used to match for this should also be declared using |
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* MODULE_DEVICE_TABLE(x86cpu, ...) |
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* |
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* This always matches against the boot cpu, assuming models and features are |
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* consistent over all CPUs. |
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*/ |
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const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match) |
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{ |
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const struct x86_cpu_id *m; |
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struct cpuinfo_x86 *c = &boot_cpu_data; |
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for (m = match; |
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m->vendor | m->family | m->model | m->steppings | m->feature; |
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m++) { |
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if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor) |
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continue; |
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if (m->family != X86_FAMILY_ANY && c->x86 != m->family) |
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continue; |
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if (m->model != X86_MODEL_ANY && c->x86_model != m->model) |
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continue; |
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if (m->steppings != X86_STEPPING_ANY && |
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!(BIT(c->x86_stepping) & m->steppings)) |
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continue; |
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if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature)) |
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continue; |
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return m; |
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} |
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return NULL; |
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} |
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EXPORT_SYMBOL(x86_match_cpu); |
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static const struct x86_cpu_desc * |
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x86_match_cpu_with_stepping(const struct x86_cpu_desc *match) |
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{ |
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struct cpuinfo_x86 *c = &boot_cpu_data; |
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const struct x86_cpu_desc *m; |
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for (m = match; m->x86_family | m->x86_model; m++) { |
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if (c->x86_vendor != m->x86_vendor) |
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continue; |
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if (c->x86 != m->x86_family) |
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continue; |
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if (c->x86_model != m->x86_model) |
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continue; |
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if (c->x86_stepping != m->x86_stepping) |
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continue; |
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return m; |
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} |
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return NULL; |
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} |
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bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table) |
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{ |
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const struct x86_cpu_desc *res = x86_match_cpu_with_stepping(table); |
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if (!res || res->x86_microcode_rev > boot_cpu_data.microcode) |
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return false; |
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return true; |
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} |
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EXPORT_SYMBOL_GPL(x86_cpu_has_min_microcode_rev);
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