[deliverable/linux.git] / arch / x86 / kernel / cpu / addon_cpuid_features.c


/*
 *	Routines to indentify additional cpu features that are scattered in
 *	cpuid space.
 */

#include <linux/cpu.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, &regs[CR_EAX], &regs[CR_EBX],
			&regs[CR_ECX], &regs[CR_EDX]);

		if (regs[cb->reg] & (1 << cb->bit))
			set_cpu_cap(c, cb->feature);
	}
}
Commit	Line	Data
1d67953f VP	1
	2	/*
	3	* Routines to indentify additional cpu features that are scattered in
	4	* cpuid space.
	5	*/
	6
	7	#include <linux/cpu.h>
	8
	9	#include <asm/processor.h>
	10
	11	struct cpuid_bit {
	12	u16 feature;
	13	u8 reg;
	14	u8 bit;
	15	u32 level;
	16	};
	17
	18	enum cpuid_regs {
	19	CR_EAX = 0,
	20	CR_ECX,
	21	CR_EDX,
	22	CR_EBX
	23	};
	24
	25	void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
	26	{
	27	u32 max_level;
	28	u32 regs[4];
	29	const struct cpuid_bit *cb;
	30
	31	static const struct cpuid_bit cpuid_bits[] = {
	32	{ X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 },
	33	{ 0, 0, 0, 0 }
	34	};
	35
	36	for (cb = cpuid_bits; cb->feature; cb++) {
	37
	38	/* Verify that the level is valid */
	39	max_level = cpuid_eax(cb->level & 0xffff0000);
	40	if (max_level < cb->level \|\|
	41	max_level > (cb->level \| 0xffff))
	42	continue;
	43
	44	cpuid(cb->level, &regs[CR_EAX], &regs[CR_EBX],
	45	&regs[CR_ECX], &regs[CR_EDX]);
	46
	47	if (regs[cb->reg] & (1 << cb->bit))
53756d37	48	set_cpu_cap(c, cb->feature);
1d67953f VP	49	}
1d67953f VP	50	}