Page calculation

[nyax.git] / stage2 / main.asm

diff --git a/stage2/main.asm b/stage2/main.asm
new file mode 100644 (file)
index 0000000..1e3ab94
--- /dev/null
+++ b/stage2/main.asm
@@ -0,0 +1,94 @@
+[org 0x7E00]
+
+%define PAGETABLE 0x1000
+%define VESAINFO  0x0500
+%define VESAMODE VESAINFO+512
+%define OWNMODE  VESAMODE+256
+%define GFXINFO PAGETABLE-10
+%define MEMMAPCNT GFXINFO-2
+%define MEMMAP 0x500
+
+setup:
+       ; print message
+       mov ebx, .msg
+       call print_str
+
+       ; setup VESA
+       ; call vesa
+
+       ; get extended memory map
+       call mmap
+
+       ; build page table
+       call paging
+
+       ; jump into long mode
+       jmp 0x0008:long_mode
+
+.msg:
+       db 10, 13, "nyax stage2", 10, 13, 0
+
+%include "stage2/vesa.asm"
+%include "stage2/mmap.asm"
+%include "stage2/paging.asm"
+%include "stage1/print.asm"
+
+; modify eax, ebx, ecx, edx
+print_hex:
+       mov ebx, 0x10
+       jmp print_num
+print_dec:
+       mov ebx, 10
+print_num:
+       xor ecx, ecx
+.convert:
+       inc ecx
+       xor edx, edx
+       div ebx
+       cmp dl, 10
+       jb .digit
+       add dl, 'A'-10
+       jmp .next
+.digit:
+       add dl, '0'
+.next:
+       push dx
+       cmp eax, 0
+       jne .convert
+.print:
+       cmp ecx, 0
+       je .return
+       dec ecx
+       pop ax
+       mov ah, 0x0E
+       int 0x10
+       jmp .print
+.return:
+       ret
+
+newline:
+       mov al, 10
+       call print_chr
+
+       mov al, 13
+       call print_chr
+
+       ret
+
+print_chr:
+       mov ah, 0x0E
+       int 0x10
+       ret
+
+[bits 64]
+
+long_mode:
+       ; setup segment registers
+       mov ax, 0x0010
+       mov ds, ax
+       mov es, ax
+       mov fs, ax
+       mov gs, ax
+       mov ss, ax
+
+       ; kernel begins here