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x86: Add GDT descriptors for option ROMs

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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>
This commit is contained in:
Simon Glass 2014-11-14 20:56:29 -07:00
parent 176bf4ce0c
commit e34aef1de3
2 changed files with 17 additions and 21 deletions
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9
arch/x86/cpu/cpu.c
View file

@ -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);

29
arch/x86/include/asm/processor.h
View file

@ -8,25 +8,18 @@
#ifndef __ASM_PROCESSOR_H_
#define __ASM_PROCESSOR_H_ 1
#define X86_GDT_ENTRY_SIZE 8
#define X86_GDT_ENTRY_SIZE 8
#ifndef __ASSEMBLY__
enum {
X86_GDT_ENTRY_NULL = 0,
X86_GDT_ENTRY_UNUSED,
X86_GDT_ENTRY_32BIT_CS,
X86_GDT_ENTRY_32BIT_DS,
X86_GDT_ENTRY_32BIT_FS,
X86_GDT_ENTRY_16BIT_CS,
X86_GDT_ENTRY_16BIT_DS,
X86_GDT_NUM_ENTRIES
};
#else
/* NOTE: If the above enum is modified, this define must be checked */
#define X86_GDT_ENTRY_32BIT_DS 3
#define X86_GDT_NUM_ENTRIES 7
#endif
#define X86_GDT_ENTRY_NULL 0
#define X86_GDT_ENTRY_UNUSED 1
#define X86_GDT_ENTRY_32BIT_CS 2
#define X86_GDT_ENTRY_32BIT_DS 3
#define X86_GDT_ENTRY_32BIT_FS 4
#define X86_GDT_ENTRY_16BIT_CS 5
#define X86_GDT_ENTRY_16BIT_DS 6
#define X86_GDT_ENTRY_16BIT_FLAT_CS 7
#define X86_GDT_ENTRY_16BIT_FLAT_DS 8
#define X86_GDT_NUM_ENTRIES 9
#define X86_GDT_SIZE (X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE)