92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
#include <asm/cpu_device_id.h>
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#include <asm/processor.h>
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#include <linux/cpu.h>
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#include <linux/module.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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* { X86_VENDOR_INTEL, 6, 0x12 }
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* or to match a specific CPU feature
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* { X86_FEATURE_MATCH(X86_FEATURE_FOOBAR) }
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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 or 0 (except for vendor)
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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; m->vendor | m->family | m->model | m->feature; 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->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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ssize_t arch_print_cpu_modalias(struct device *dev,
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struct device_attribute *attr,
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char *bufptr)
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{
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int size = PAGE_SIZE;
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int i, n;
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char *buf = bufptr;
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n = snprintf(buf, size, "x86cpu:vendor:%04X:family:%04X:"
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"model:%04X:feature:",
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boot_cpu_data.x86_vendor,
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boot_cpu_data.x86,
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boot_cpu_data.x86_model);
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size -= n;
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buf += n;
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size -= 1;
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for (i = 0; i < NCAPINTS*32; i++) {
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if (boot_cpu_has(i)) {
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n = snprintf(buf, size, ",%04X", i);
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if (n >= size) {
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WARN(1, "x86 features overflow page\n");
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break;
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}
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size -= n;
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buf += n;
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}
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}
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*buf++ = '\n';
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return buf - bufptr;
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}
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int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
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if (buf) {
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arch_print_cpu_modalias(NULL, NULL, buf);
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add_uevent_var(env, "MODALIAS=%s", buf);
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kfree(buf);
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}
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return 0;
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}
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