diff options
Diffstat (limited to 'arch/x86/cpu')
| -rw-r--r-- | arch/x86/cpu/i386/cpu.c | 32 |
1 files changed, 5 insertions, 27 deletions
diff --git a/arch/x86/cpu/i386/cpu.c b/arch/x86/cpu/i386/cpu.c index c7f6c5a013..91cd5d7c9e 100644 --- a/arch/x86/cpu/i386/cpu.c +++ b/arch/x86/cpu/i386/cpu.c @@ -572,6 +572,7 @@ int cpu_has_64bit(void) has_long_mode(); } +/* Base address for page tables used for 64-bit mode */ #define PAGETABLE_BASE 0x80000 #define PAGETABLE_SIZE (6 * 4096) @@ -614,43 +615,20 @@ int cpu_jump_to_64bit(ulong setup_base, ulong target) } /* - * Jump from SPL to U-Boot + * cpu_jump_to_64bit_uboot() - Jump from SPL to U-Boot * - * This function is work-in-progress with many issues to resolve. - * - * It works by setting up several regions: - * ptr - a place to put the code that jumps into 64-bit mode - * gdt - a place to put the global descriptor table - * pgtable - a place to put the page tables - * - * The cpu_call64() code is copied from ROM and then manually patched so that - * it has the correct GDT address in RAM. U-Boot is copied from ROM into - * its pre-relocation address. Then we jump to the cpu_call64() code in RAM, - * which changes to 64-bit mode and starts U-Boot. + * It works by setting up page tables and calling the code to enter 64-bit long + * mode */ int cpu_jump_to_64bit_uboot(ulong target) { - typedef void (*func_t)(ulong pgtable, ulong setup_base, ulong target); uint32_t *pgtable; - func_t func; - char *ptr; pgtable = (uint32_t *)PAGETABLE_BASE; - build_pagetable(pgtable); - extern long call64_stub_size; - ptr = malloc(call64_stub_size); - if (!ptr) { - printf("Failed to allocate the cpu_call64 stub\n"); - return -ENOMEM; - } - memcpy(ptr, cpu_call64, call64_stub_size); - - func = (func_t)ptr; - /* Jump to U-Boot */ - func((ulong)pgtable, 0, (ulong)target); + cpu_call64(PAGETABLE_BASE, 0, (ulong)target); return -EFAULT; } |