diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 1997-06-01 03:16:17 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 1997-06-01 03:16:17 +0000 |
| commit | d8d9b8f76f22b7a16a83e261e64f89ee611f49df (patch) | |
| tree | 3067bc130b80d52808e6390c9fc7fc087ec1e33c /arch/i386/kernel/trampoline.S | |
| parent | 19c9bba94152148523ba0f7ef7cffe3d45656b11 (diff) | |
Initial revision
Diffstat (limited to 'arch/i386/kernel/trampoline.S')
| -rw-r--r-- | arch/i386/kernel/trampoline.S | 43 |
1 files changed, 2 insertions, 41 deletions
diff --git a/arch/i386/kernel/trampoline.S b/arch/i386/kernel/trampoline.S index 63bc51c5e..d0a726f6b 100644 --- a/arch/i386/kernel/trampoline.S +++ b/arch/i386/kernel/trampoline.S @@ -21,13 +21,9 @@ * and IP is zero. Thus, data addresses need to be absolute * (no relocation) and are taken with regard to r_base. * - * On the transition to protected mode, this page appears at - * address 8192, so protected mode addresses are with regard - * to p_base. - * * If you work on this file, check the object module with objdump * --full-contents --reloc to make sure there are no relocation - * entries. + * entries except for the gdt one.. */ #include <linux/linkage.h> @@ -39,15 +35,10 @@ ENTRY(trampoline_data) r_base = . -p_base = . - 8192 mov %cs, %ax # Code and data in the same place mov %ax, %ds - mov %ax, %cx # Pass stack info to the 32bit boot - shl $4, %cx # Segment -> Offset - add $4096, %cx # End of page is wanted - mov $1, %bx # Flag an SMP trampoline cli # We should be safe anyway @@ -71,37 +62,7 @@ idt_48: gdt_48: .word 0x0800 # gdt limit = 2048, 256 GDT entries - .word gdt - p_base, 0x0 # gdt base = gdt (first SMP CPU) - # we load the others with first table - # saves rewriting gdt_48 for each -gdt: - .word 0, 0, 0, 0 # dummy - - .word 0, 0, 0, 0 # unused - -# walken modif - - .word 0xFFFF # 4 Gb - (0x100000*0x1000 = 4Gb) - .word 0x0000 # base address = 0 - .word 0x9A00 # code read / exec - .word 0x00CF # granularity = 4096, 386 (+5th nibble of limit) - - .word 0xFFFF # 4 Gb - (0x100000*0x1000 = 4Gb) - .word 0x0000 # base address = 0 - .word 0x9200 # data read / write - .word 0x00CF # granularity = 4096, 386 (+5th nibble of limit) - -# walken modif - -# .word 0x07FF # 8 Mb - limit = 2047 (2048 * 4096 = 8 Mb) -# .word 0x0000 # base address = 0 -# .word 0x9A00 # code read / exec -# .word 0x00C0 # granularity = 4096, 386 - -# .word 0x07FF # 8 Mb - limit = 2047 (2048 * 4096 = 8 Mb) -# .word 0x0000 # base address = 0 -# .word 0x9200 # data read / write -# .word 0x00C0 # granularity = 4096, 386 + .long gdt-0xc0000000 # gdt base = gdt (first SMP CPU) .globl SYMBOL_NAME(trampoline_end) SYMBOL_NAME_LABEL(trampoline_end) |