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- /*
- * Routines to indentify additional cpu features that are scattered in
- * cpuid space.
- */
- #include <linux/cpu.h>
- #include <asm/pat.h>
- #include <asm/processor.h>
- struct cpuid_bit {
- u16 feature;
- u8 reg;
- u8 bit;
- u32 level;
- };
- enum cpuid_regs {
- CR_EAX = 0,
- CR_ECX,
- CR_EDX,
- CR_EBX
- };
- void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
- {
- u32 max_level;
- u32 regs[4];
- const struct cpuid_bit *cb;
- static const struct cpuid_bit cpuid_bits[] = {
- { X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 },
- { 0, 0, 0, 0 }
- };
- for (cb = cpuid_bits; cb->feature; cb++) {
- /* Verify that the level is valid */
- max_level = cpuid_eax(cb->level & 0xffff0000);
- if (max_level < cb->level ||
- max_level > (cb->level | 0xffff))
- continue;
- cpuid(cb->level, ®s[CR_EAX], ®s[CR_EBX],
- ®s[CR_ECX], ®s[CR_EDX]);
- if (regs[cb->reg] & (1 << cb->bit))
- set_cpu_cap(c, cb->feature);
- }
- }
- #ifdef CONFIG_X86_PAT
- void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
- {
- switch (c->x86_vendor) {
- case X86_VENDOR_AMD:
- if (c->x86 >= 0xf && c->x86 <= 0x11)
- return;
- break;
- case X86_VENDOR_INTEL:
- if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
- return;
- break;
- }
- pat_disable(cpu_has_pat ?
- "PAT disabled. Not yet verified on this CPU type." :
- "PAT not supported by CPU.");
- }
- #endif
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