172 lines
3.2 KiB
C
172 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* CPUID-related helpers/definitions
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*/
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#ifndef _ASM_X86_CPUID_H
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#define _ASM_X86_CPUID_H
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#include <asm/string.h>
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struct cpuid_regs {
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u32 eax, ebx, ecx, edx;
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};
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enum cpuid_regs_idx {
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CPUID_EAX = 0,
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CPUID_EBX,
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CPUID_ECX,
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CPUID_EDX,
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};
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#ifdef CONFIG_X86_32
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extern int have_cpuid_p(void);
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#else
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static inline int have_cpuid_p(void)
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{
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return 1;
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}
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#endif
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static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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/* ecx is often an input as well as an output. */
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asm volatile("cpuid"
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: "=a" (*eax),
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"=b" (*ebx),
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"=c" (*ecx),
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"=d" (*edx)
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: "0" (*eax), "2" (*ecx)
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: "memory");
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}
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#define native_cpuid_reg(reg) \
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static inline unsigned int native_cpuid_##reg(unsigned int op) \
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{ \
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unsigned int eax = op, ebx, ecx = 0, edx; \
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\
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native_cpuid(&eax, &ebx, &ecx, &edx); \
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\
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return reg; \
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}
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/*
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* Native CPUID functions returning a single datum.
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*/
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native_cpuid_reg(eax)
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native_cpuid_reg(ebx)
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native_cpuid_reg(ecx)
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native_cpuid_reg(edx)
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#ifdef CONFIG_PARAVIRT_XXL
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#include <asm/paravirt.h>
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#else
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#define __cpuid native_cpuid
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#endif
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/*
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* Generic CPUID function
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* clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
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* resulting in stale register contents being returned.
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*/
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static inline void cpuid(unsigned int op,
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unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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*eax = op;
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*ecx = 0;
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__cpuid(eax, ebx, ecx, edx);
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}
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/* Some CPUID calls want 'count' to be placed in ecx */
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static inline void cpuid_count(unsigned int op, int count,
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unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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*eax = op;
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*ecx = count;
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__cpuid(eax, ebx, ecx, edx);
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}
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/*
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* CPUID functions returning a single datum
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*/
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static inline unsigned int cpuid_eax(unsigned int op)
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{
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unsigned int eax, ebx, ecx, edx;
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cpuid(op, &eax, &ebx, &ecx, &edx);
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return eax;
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}
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static inline unsigned int cpuid_ebx(unsigned int op)
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{
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unsigned int eax, ebx, ecx, edx;
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cpuid(op, &eax, &ebx, &ecx, &edx);
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return ebx;
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}
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static inline unsigned int cpuid_ecx(unsigned int op)
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{
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unsigned int eax, ebx, ecx, edx;
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cpuid(op, &eax, &ebx, &ecx, &edx);
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return ecx;
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}
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static inline unsigned int cpuid_edx(unsigned int op)
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{
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unsigned int eax, ebx, ecx, edx;
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cpuid(op, &eax, &ebx, &ecx, &edx);
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return edx;
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}
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static __always_inline bool cpuid_function_is_indexed(u32 function)
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{
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switch (function) {
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case 4:
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case 7:
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case 0xb:
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case 0xd:
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case 0xf:
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case 0x10:
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case 0x12:
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case 0x14:
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case 0x17:
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case 0x18:
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case 0x1d:
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case 0x1e:
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case 0x1f:
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case 0x8000001d:
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return true;
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}
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return false;
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}
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#define for_each_possible_hypervisor_cpuid_base(function) \
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for (function = 0x40000000; function < 0x40010000; function += 0x100)
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static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
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{
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uint32_t base, eax, signature[3];
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for_each_possible_hypervisor_cpuid_base(base) {
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cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
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if (!memcmp(sig, signature, 12) &&
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(leaves == 0 || ((eax - base) >= leaves)))
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return base;
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}
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return 0;
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}
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#endif /* _ASM_X86_CPUID_H */
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