diff options
Diffstat (limited to 'arch/i386/cpu/cpu.c')
| -rw-r--r-- | arch/i386/cpu/cpu.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/arch/i386/cpu/cpu.c b/arch/i386/cpu/cpu.c index ae40384..2339cd4 100644 --- a/arch/i386/cpu/cpu.c +++ b/arch/i386/cpu/cpu.c @@ -35,6 +35,8 @@ #include <common.h> #include <command.h> +#include <asm/processor.h> +#include <asm/processor-flags.h> #include <asm/interrupt.h> /* Constructor for a conventional segment GDT (or LDT) entry */ @@ -46,13 +48,6 @@ (((base) & 0x00ffffffULL) << 16) | \ (((limit) & 0x0000ffffULL))) -/* Simple and small GDT entries for booting only */ - -#define GDT_ENTRY_32BIT_CS 2 -#define GDT_ENTRY_32BIT_DS (GDT_ENTRY_32BIT_CS + 1) -#define GDT_ENTRY_16BIT_CS (GDT_ENTRY_32BIT_DS + 1) -#define GDT_ENTRY_16BIT_DS (GDT_ENTRY_16BIT_CS + 1) - /* * Set up the GDT */ @@ -92,26 +87,40 @@ static void reload_gdt(void) } -int cpu_init_f(void) +int x86_cpu_init_f(void) { + const u32 em_rst = ~X86_CR0_EM; + const u32 mp_ne_set = X86_CR0_MP | X86_CR0_NE; + /* initialize FPU, reset EM, set MP and NE */ asm ("fninit\n" \ - "movl %cr0, %eax\n" \ - "andl $~0x4, %eax\n" \ - "orl $0x22, %eax\n" \ - "movl %eax, %cr0\n" ); + "movl %%cr0, %%eax\n" \ + "andl %0, %%eax\n" \ + "orl %1, %%eax\n" \ + "movl %%eax, %%cr0\n" \ + : : "i" (em_rst), "i" (mp_ne_set) : "eax"); return 0; } +int cpu_init_f(void) __attribute__((weak, alias("x86_cpu_init_f"))); -int cpu_init_r(void) +int x86_cpu_init_r(void) { + const u32 nw_cd_rst = ~(X86_CR0_NW | X86_CR0_CD); + + /* turn on the cache and disable write through */ + asm("movl %%cr0, %%eax\n" + "andl %0, %%eax\n" + "movl %%eax, %%cr0\n" + "wbinvd\n" : : "i" (nw_cd_rst) : "eax"); + reload_gdt(); /* Initialize core interrupt and exception functionality of CPU */ cpu_init_interrupts (); return 0; } +int cpu_init_r(void) __attribute__((weak, alias("x86_cpu_init_r"))); int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { |