x86: Display basic CPU information on boot

Display the type of CPU (x86 or x86_64) when starting up.

Signed-off-by: Simon Glass <sjg@chromium.org>
master
Simon Glass 10 years ago
parent dc68584b42
commit 92cc94a1fe
  1. 64
      arch/x86/cpu/cpu.c
  2. 7
      arch/x86/include/asm/cpu.h
  3. 1
      include/configs/coreboot.h

@ -275,3 +275,67 @@ void cpu_disable_paging_pae(void)
: :
: "eax"); : "eax");
} }
static bool has_cpuid(void)
{
unsigned long flag;
asm volatile("pushf\n" \
"pop %%eax\n"
"mov %%eax, %%ecx\n" /* ecx = flags */
"xor %1, %%eax\n"
"push %%eax\n"
"popf\n" /* flags ^= $2 */
"pushf\n"
"pop %%eax\n" /* eax = flags */
"push %%ecx\n"
"popf\n" /* flags = ecx */
"xor %%ecx, %%eax\n"
"mov %%eax, %0"
: "=r" (flag)
: "i" (1 << 21)
: "eax", "ecx", "memory");
return flag != 0;
}
static bool can_detect_long_mode(void)
{
unsigned long flag;
asm volatile("mov $0x80000000, %%eax\n"
"cpuid\n"
"mov %%eax, %0"
: "=r" (flag)
:
: "eax", "ebx", "ecx", "edx", "memory");
return flag > 0x80000000UL;
}
static bool has_long_mode(void)
{
unsigned long flag;
asm volatile("mov $0x80000001, %%eax\n"
"cpuid\n"
"mov %%edx, %0"
: "=r" (flag)
:
: "eax", "ebx", "ecx", "edx", "memory");
return flag & (1 << 29) ? true : false;
}
int cpu_has_64bit(void)
{
return has_cpuid() && can_detect_long_mode() &&
has_long_mode();
}
int print_cpuinfo(void)
{
printf("CPU: %s\n", cpu_has_64bit() ? "x86_64" : "x86");
return 0;
}

@ -19,4 +19,11 @@ void cpu_enable_paging_pae(ulong cr3);
*/ */
void cpu_disable_paging_pae(void); void cpu_disable_paging_pae(void);
/**
* cpu_has_64bit() - Check if the CPU has 64-bit support
*
* @return 1 if this CPU supports long mode (64-bit), 0 if not
*/
int cpu_has_64bit(void);
#endif #endif

@ -26,6 +26,7 @@
#define CONFIG_PHYSMEM #define CONFIG_PHYSMEM
#define CONFIG_SYS_EARLY_PCI_INIT #define CONFIG_SYS_EARLY_PCI_INIT
#define CONFIG_DISPLAY_BOARDINFO_LATE #define CONFIG_DISPLAY_BOARDINFO_LATE
#define CONFIG_DISPLAY_CPUINFO
#define CONFIG_DM #define CONFIG_DM
#define CONFIG_CMD_DM #define CONFIG_CMD_DM

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