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x86: Update cpuid_eax et al to work on amd64

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The existing functions work but the register clobbers are wrong, so
strange bugs results.

The original functions were taken from a very old version of Linux.
Update them from Linux 6.13

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2025-03-15 14:25:44 +00:00 committed by Tom Rini
parent 5450836115
commit 21feb3404e
1 changed files with 28 additions and 53 deletions
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81
arch/x86/include/asm/cpu.h
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@ -109,61 +109,36 @@ static inline struct cpuid_result cpuid_ext(int op, unsigned ecx)
return result;
}
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 cpuid_##reg(unsigned int op) \
{ \
unsigned int eax = op, ebx, ecx = 0, edx; \
\
native_cpuid(&eax, &ebx, &ecx, &edx); \
\
return reg; \
}
/*
* CPUID functions returning a single datum
* Native CPUID functions returning a single datum.
*/
static inline unsigned int cpuid_eax(unsigned int op)
{
unsigned int eax;
__asm__("mov %%ebx, %%edi;"
"cpuid;"
"mov %%edi, %%ebx;"
: "=a" (eax)
: "0" (op)
: "ecx", "edx", "edi");
return eax;
}
static inline unsigned int cpuid_ebx(unsigned int op)
{
unsigned int eax, ebx;
__asm__("mov %%ebx, %%edi;"
"cpuid;"
"mov %%ebx, %%esi;"
"mov %%edi, %%ebx;"
: "=a" (eax), "=S" (ebx)
: "0" (op)
: "ecx", "edx", "edi");
return ebx;
}
static inline unsigned int cpuid_ecx(unsigned int op)
{
unsigned int eax, ecx;
__asm__("mov %%ebx, %%edi;"
"cpuid;"
"mov %%edi, %%ebx;"
: "=a" (eax), "=c" (ecx)
: "0" (op)
: "edx", "edi");
return ecx;
}
static inline unsigned int cpuid_edx(unsigned int op)
{
unsigned int eax, edx;
__asm__("mov %%ebx, %%edi;"
"cpuid;"
"mov %%edi, %%ebx;"
: "=a" (eax), "=d" (edx)
: "0" (op)
: "ecx", "edi");
return edx;
}
native_cpuid_reg(eax)
native_cpuid_reg(ebx)
native_cpuid_reg(ecx)
native_cpuid_reg(edx)
#if CONFIG_IS_ENABLED(X86_64)
static inline int flag_is_changeable_p(u32 flag)