mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 18:13:04 +00:00
d800169041
Carve it out into a special header, where it belongs. No functional changes. Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20221124164150.3040-1-bp@alien8.de
172 lines
3.2 KiB
C
172 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* CPUID-related helpers/definitions
|
|
*/
|
|
|
|
#ifndef _ASM_X86_CPUID_H
|
|
#define _ASM_X86_CPUID_H
|
|
|
|
#include <asm/string.h>
|
|
|
|
struct cpuid_regs {
|
|
u32 eax, ebx, ecx, edx;
|
|
};
|
|
|
|
enum cpuid_regs_idx {
|
|
CPUID_EAX = 0,
|
|
CPUID_EBX,
|
|
CPUID_ECX,
|
|
CPUID_EDX,
|
|
};
|
|
|
|
#ifdef CONFIG_X86_32
|
|
extern int have_cpuid_p(void);
|
|
#else
|
|
static inline int have_cpuid_p(void)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
|
|
unsigned int *ecx, unsigned int *edx)
|
|
{
|
|
/* ecx is often an input as well as an output. */
|
|
asm volatile("cpuid"
|
|
: "=a" (*eax),
|
|
"=b" (*ebx),
|
|
"=c" (*ecx),
|
|
"=d" (*edx)
|
|
: "0" (*eax), "2" (*ecx)
|
|
: "memory");
|
|
}
|
|
|
|
#define native_cpuid_reg(reg) \
|
|
static inline unsigned int native_cpuid_##reg(unsigned int op) \
|
|
{ \
|
|
unsigned int eax = op, ebx, ecx = 0, edx; \
|
|
\
|
|
native_cpuid(&eax, &ebx, &ecx, &edx); \
|
|
\
|
|
return reg; \
|
|
}
|
|
|
|
/*
|
|
* Native CPUID functions returning a single datum.
|
|
*/
|
|
native_cpuid_reg(eax)
|
|
native_cpuid_reg(ebx)
|
|
native_cpuid_reg(ecx)
|
|
native_cpuid_reg(edx)
|
|
|
|
#ifdef CONFIG_PARAVIRT_XXL
|
|
#include <asm/paravirt.h>
|
|
#else
|
|
#define __cpuid native_cpuid
|
|
#endif
|
|
|
|
/*
|
|
* Generic CPUID function
|
|
* clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
|
|
* resulting in stale register contents being returned.
|
|
*/
|
|
static inline void cpuid(unsigned int op,
|
|
unsigned int *eax, unsigned int *ebx,
|
|
unsigned int *ecx, unsigned int *edx)
|
|
{
|
|
*eax = op;
|
|
*ecx = 0;
|
|
__cpuid(eax, ebx, ecx, edx);
|
|
}
|
|
|
|
/* Some CPUID calls want 'count' to be placed in ecx */
|
|
static inline void cpuid_count(unsigned int op, int count,
|
|
unsigned int *eax, unsigned int *ebx,
|
|
unsigned int *ecx, unsigned int *edx)
|
|
{
|
|
*eax = op;
|
|
*ecx = count;
|
|
__cpuid(eax, ebx, ecx, edx);
|
|
}
|
|
|
|
/*
|
|
* CPUID functions returning a single datum
|
|
*/
|
|
static inline unsigned int cpuid_eax(unsigned int op)
|
|
{
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
cpuid(op, &eax, &ebx, &ecx, &edx);
|
|
|
|
return eax;
|
|
}
|
|
|
|
static inline unsigned int cpuid_ebx(unsigned int op)
|
|
{
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
cpuid(op, &eax, &ebx, &ecx, &edx);
|
|
|
|
return ebx;
|
|
}
|
|
|
|
static inline unsigned int cpuid_ecx(unsigned int op)
|
|
{
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
cpuid(op, &eax, &ebx, &ecx, &edx);
|
|
|
|
return ecx;
|
|
}
|
|
|
|
static inline unsigned int cpuid_edx(unsigned int op)
|
|
{
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
cpuid(op, &eax, &ebx, &ecx, &edx);
|
|
|
|
return edx;
|
|
}
|
|
|
|
static __always_inline bool cpuid_function_is_indexed(u32 function)
|
|
{
|
|
switch (function) {
|
|
case 4:
|
|
case 7:
|
|
case 0xb:
|
|
case 0xd:
|
|
case 0xf:
|
|
case 0x10:
|
|
case 0x12:
|
|
case 0x14:
|
|
case 0x17:
|
|
case 0x18:
|
|
case 0x1d:
|
|
case 0x1e:
|
|
case 0x1f:
|
|
case 0x8000001d:
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
#define for_each_possible_hypervisor_cpuid_base(function) \
|
|
for (function = 0x40000000; function < 0x40010000; function += 0x100)
|
|
|
|
static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
|
|
{
|
|
uint32_t base, eax, signature[3];
|
|
|
|
for_each_possible_hypervisor_cpuid_base(base) {
|
|
cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
|
|
|
|
if (!memcmp(sig, signature, 12) &&
|
|
(leaves == 0 || ((eax - base) >= leaves)))
|
|
return base;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* _ASM_X86_CPUID_H */
|