diff options
Diffstat (limited to 'bsps/i386/pc386/start/startAP.S')
| -rw-r--r-- | bsps/i386/pc386/start/startAP.S | 39 |
1 files changed, 6 insertions, 33 deletions
diff --git a/bsps/i386/pc386/start/startAP.S b/bsps/i386/pc386/start/startAP.S index 0f81c03144..024c1f70fb 100644 --- a/bsps/i386/pc386/start/startAP.S +++ b/bsps/i386/pc386/start/startAP.S @@ -73,9 +73,12 @@ app_processor_start: */ .align 4 app_cpu_start: - .long 0 + .long 0 app_cpu_stack: - .long 0 + .long 0 +app_gdt_descr: + .word 0 /* GDT size */ + .long 0 /* GDT location */ setup_processor: movw %cs, %ax # Initialize the rest of @@ -87,7 +90,7 @@ setup_processor: | Bare PC machines boot in real mode! We have to turn protected mode on. +---------------------------------------------------------------------*/ - lgdt gdtptr - app_processor_start # load Global Descriptor Table + lgdt app_gdt_descr - app_processor_start # load Global Descriptor Table movl %cr0, %eax orl $CR0_PE, %eax @@ -113,33 +116,3 @@ start_32bit: movl $0, app_cpu_stack /* Switch to the higher level initialization routines */ ret - -/*----------------------------------------------------------------------------+ -| DATA section -+----------------------------------------------------------------------------*/ - -/************************** -* GLOBAL DESCRIPTOR TABLE * -**************************/ - - .p2align 4 -gdtptr: - /* we use the NULL descriptor to store the GDT pointer - a trick quite - nifty due to: Robert Collins (rcollins@x86.org) */ - .word gdtlen - 1 - .long gdtptr - .word 0x0000 - - /* code segment */ - .word 0xffff, 0 - .byte 0, 0x9f, 0xcf, 0 - - /* data segment */ - .word 0xffff, 0 - .byte 0, 0x93, 0xcf, 0 - - /* gs segment */ - .word 0xffff, 0 - .byte 0, 0x92, 0xcf, 0 - - .set gdtlen, . - gdtptr # length of GDT |