[linux-2.6-block.git] / arch / x86 / kernel / cpu / scattered.c

/*
 *	Routines to identify additional cpu features that are scattered in
 *	cpuid space.
 */
#include <linux/cpu.h>

#include <asm/pat.h>
#include <asm/apic.h>
#include <asm/processor.h>

#include "cpu.h"

struct cpuid_bit {
	u16 feature;
	u8 reg;
	u8 bit;
	u32 level;
	u32 sub_leaf;
};

/* Please keep the leaf sorted by cpuid_bit.level for faster search. */
static const struct cpuid_bit cpuid_bits[] = {
	{ X86_FEATURE_APERFMPERF,       CPUID_ECX,  0, 0x00000006, 0 },
	{ X86_FEATURE_EPB,		CPUID_ECX,  3, 0x00000006, 0 },
	{ X86_FEATURE_CAT_L3,		CPUID_EBX,  1, 0x00000010, 0 },
	{ X86_FEATURE_CAT_L2,		CPUID_EBX,  2, 0x00000010, 0 },
	{ X86_FEATURE_CDP_L3,		CPUID_ECX,  2, 0x00000010, 1 },
	{ X86_FEATURE_CDP_L2,		CPUID_ECX,  2, 0x00000010, 2 },
	{ X86_FEATURE_MBA,		CPUID_EBX,  3, 0x00000010, 0 },
	{ X86_FEATURE_HW_PSTATE,	CPUID_EDX,  7, 0x80000007, 0 },
	{ X86_FEATURE_CPB,		CPUID_EDX,  9, 0x80000007, 0 },
	{ X86_FEATURE_PROC_FEEDBACK,    CPUID_EDX, 11, 0x80000007, 0 },
	{ X86_FEATURE_SME,		CPUID_EAX,  0, 0x8000001f, 0 },
	{ X86_FEATURE_SEV,		CPUID_EAX,  1, 0x8000001f, 0 },
	{ 0, 0, 0, 0, 0 }
};

void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
{
	u32 max_level;
	u32 regs[4];
	const struct cpuid_bit *cb;

	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_count(cb->level, cb->sub_leaf, &regs[CPUID_EAX],
			    &regs[CPUID_EBX], &regs[CPUID_ECX],
			    &regs[CPUID_EDX]);

		if (regs[cb->reg] & (1 << cb->bit))
			set_cpu_cap(c, cb->feature);
	}
}

u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf,
			     enum cpuid_regs_idx reg)
{
	const struct cpuid_bit *cb;
	u32 cpuid_val = 0;

	for (cb = cpuid_bits; cb->feature; cb++) {

		if (level > cb->level)
			continue;

		if (level < cb->level)
			break;

		if (reg == cb->reg && sub_leaf == cb->sub_leaf) {
			if (cpu_has(&boot_cpu_data, cb->feature))
				cpuid_val |= BIT(cb->bit);
		}
	}

	return cpuid_val;
}
EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf);
Commit	Line	Data
2decb194	1	/*
3f79410c	2	* Routines to identify additional cpu features that are scattered in
2decb194 PA	3	* cpuid space.
	4	*/
	5	#include <linux/cpu.h>
	6
	7	#include <asm/pat.h>
ad3bc25a	8	#include <asm/apic.h>
2decb194 PA	9	#include <asm/processor.h>
2decb194 PA	10
ad3bc25a	11	#include "cpu.h"
2decb194 PA	12
	13	struct cpuid_bit {
	14	u16 feature;
	15	u8 reg;
	16	u8 bit;
	17	u32 level;
	18	u32 sub_leaf;
	19	};
	20
47bdf337 HC	21	/* Please keep the leaf sorted by cpuid_bit.level for faster search. */
	22	static const struct cpuid_bit cpuid_bits[] = {
	23	{ X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 },
7ce7f35b	24	{ X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 },
7ce7f35b TG	25	{ X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 },
	26	{ X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 },
	27	{ X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 },
a511e793	28	{ X86_FEATURE_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 },
ab66a33b	29	{ X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 },
7ce7f35b TG	30	{ X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
7ce7f35b TG	31	{ X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
47bdf337	32	{ X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
872cbefd	33	{ X86_FEATURE_SME, CPUID_EAX, 0, 0x8000001f, 0 },
18c71ce9	34	{ X86_FEATURE_SEV, CPUID_EAX, 1, 0x8000001f, 0 },
47bdf337	35	{ 0, 0, 0, 0, 0 }
2decb194 PA	36	};
2decb194 PA	37
148f9bb8	38	void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
2decb194 PA	39	{
	40	u32 max_level;
	41	u32 regs[4];
	42	const struct cpuid_bit *cb;
	43
2decb194 PA	44	for (cb = cpuid_bits; cb->feature; cb++) {
	45
	46	/* Verify that the level is valid */
	47	max_level = cpuid_eax(cb->level & 0xffff0000);
	48	if (max_level < cb->level \|\|
	49	max_level > (cb->level \| 0xffff))
	50	continue;
	51
47f10a36 HC	52	cpuid_count(cb->level, cb->sub_leaf, &regs[CPUID_EAX],
	53	&regs[CPUID_EBX], &regs[CPUID_ECX],
	54	&regs[CPUID_EDX]);
2decb194 PA	55
	56	if (regs[cb->reg] & (1 << cb->bit))
	57	set_cpu_cap(c, cb->feature);
	58	}
	59	}
47bdf337 HC	60
	61	u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf,
	62	enum cpuid_regs_idx reg)
	63	{
	64	const struct cpuid_bit *cb;
	65	u32 cpuid_val = 0;
	66
	67	for (cb = cpuid_bits; cb->feature; cb++) {
	68
	69	if (level > cb->level)
	70	continue;
	71
	72	if (level < cb->level)
	73	break;
	74
	75	if (reg == cb->reg && sub_leaf == cb->sub_leaf) {
	76	if (cpu_has(&boot_cpu_data, cb->feature))
	77	cpuid_val \|= BIT(cb->bit);
	78	}
	79	}
	80
	81	return cpuid_val;
	82	}
	83	EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf);