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authorSimon Glass <sjg@chromium.org>2014-11-14 20:56:29 -0700
committerSimon Glass <sjg@chromium.org>2014-11-25 06:34:14 -0700
commite34aef1de36893250a788a272b6242e46da31b86 (patch)
treefd0dd027502cc1cf79376e59a8463b3e2ecce229 /arch/x86/cpu
parent176bf4ce0cb8ddf380f116860951641c4a700271 (diff)
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x86: Add GDT descriptors for option ROMs
Option ROMs require a few additional descriptors. Add these, and remove the enum since we now have to access several descriptors from assembler. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/cpu')
-rw-r--r--arch/x86/cpu/cpu.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index cf421fa..30e5069 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -124,7 +124,7 @@ static void load_gdt(const u64 *boot_gdt, u16 num_entries)
{
struct gdt_ptr gdt;
- gdt.len = (num_entries * 8) - 1;
+ gdt.len = (num_entries * X86_GDT_ENTRY_SIZE) - 1;
gdt.ptr = (u32)boot_gdt;
asm volatile("lgdtl %0\n" : : "m" (gdt));
@@ -144,10 +144,13 @@ void setup_gdt(gd_t *id, u64 *gdt_addr)
(ulong)&id->arch.gd_addr, 0xfffff);
/* 16-bit CS: code, read/execute, 64 kB, base 0 */
- gdt_addr[X86_GDT_ENTRY_16BIT_CS] = GDT_ENTRY(0x109b, 0, 0x0ffff);
+ gdt_addr[X86_GDT_ENTRY_16BIT_CS] = GDT_ENTRY(0x009b, 0, 0x0ffff);
/* 16-bit DS: data, read/write, 64 kB, base 0 */
- gdt_addr[X86_GDT_ENTRY_16BIT_DS] = GDT_ENTRY(0x1093, 0, 0x0ffff);
+ gdt_addr[X86_GDT_ENTRY_16BIT_DS] = GDT_ENTRY(0x0093, 0, 0x0ffff);
+
+ gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_CS] = GDT_ENTRY(0x809b, 0, 0xfffff);
+ gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_DS] = GDT_ENTRY(0x8093, 0, 0xfffff);
load_gdt(gdt_addr, X86_GDT_NUM_ENTRIES);
load_ds(X86_GDT_ENTRY_32BIT_DS);