diff options
| -rw-r--r-- | core/minute-ia/init.S | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/core/minute-ia/init.S b/core/minute-ia/init.S index 054de9c4e3..5ba0cbf581 100644 --- a/core/minute-ia/init.S +++ b/core/minute-ia/init.S @@ -286,12 +286,38 @@ interrupt_descriptor interrupt_descriptor interrupt_descriptor # 255 +__gdt: + # Entry 0: Null descriptor + .word 0x0000 + .word 0x0000 + .byte 0x00 + .byte 0x00 + .byte 0x00 + .byte 0x00 + # Entry 1: Code descriptor + .word 0xffff # Limit: xffff + .word 0x0000 # Base: xxxx0000 + .byte 0x00 # Base: xx00xxxx + .byte 0x9b # Code E/R, Present, DPL0, Acesssed=1 + .byte 0xcf # Limit fxxxx, Page Gra, 32 bit + .byte 0x00 # Base: 00xxxxxx + # Entry 0: Data descriptor + .word 0xffff # Limit: xffff + .word 0x0000 # Base: xxxx0000 + .byte 0x00 # Base: xx00xxxx + .byte 0x93 # Data R/W, Present, DPL0, Acesssed=1 + .byte 0xcf # Limit fxxxx, Page Gra, 32 bit + .byte 0x00 # Base: 00xxxxxx + #.section .data __idt_ptr: .word 2047 # Table size in bytes, count from 0 # (8N - 1). N = 256 - the number of vectors .long __idt # Base address of IDT +__gdt_ptr: + .word 24 + .long __gdt .section .init .code32 @@ -316,6 +342,9 @@ reset: # System stack is within .bss, already cleared movl $stack_end, %esp + # Load GDT + lgdt __gdt_ptr + # Load IDT lidt __idt_ptr |