add aseg and loader

[netwatch.git] / aseg / aseg.asm

diff --git a/aseg/aseg.asm b/aseg/aseg.asm
new file mode 100644 (file)
index 0000000..51a2811
--- /dev/null
+++ b/aseg/aseg.asm
@@ -0,0 +1,130 @@
+       org 0x0
+[bits 16]
+entry:
+;      mov al, 0x01            ; Say where we are.
+;      out 0x80, al
+       mov ax, 0xA800
+       mov ds, ax              ; Take us out of flat unreal mode, and
+       mov es, ax              ; put us in true real mode.
+       mov fs, ax
+       mov gs, ax
+       mov ss, ax
+       jmp 0xA800:entry2               ; Long jump to a correct cs.
+entry2:
+;      mov al, 0x02
+;      out 0x80, al
+       lgdt [gdtr]                     ; Set up a new GDT.
+       mov eax, 0x1
+       mov cr0, eax                    ; ... and enter pmode!
+       mov al, 0x03                    ; Say we got here.
+       out 0x80, al
+       jmp long 0x10:(continue+0xA8000)        ; Now longjmp into the new code.
+[bits 32]
+continue:
+;      mov al, 0x04                    ; Now we're in protected mode.
+;      out 0x80, al
+       
+       mov ax, 0x08                    ; Set up segment selectors.
+       mov ds, ax
+       mov es, ax
+       mov fs, ax
+       mov gs, ax
+       mov ss, ax
+       mov esp, 0x1fffffff
+
+;      mov al, 0x05
+;      out 0x80, al
+
+       mov al, [(cstat + 0xA8000)]
+       add al, 1
+       out 0x80, al
+       mov [(cstat + 0xA8000)], al
+       
+       mov eax, 0x11223344
+       mov dword [(status + 0xA8000)], eax
+
+       mov dx, 0xCF8                   ; save off the old config value
+       in dword eax, dx
+       mov [esp-4], eax
+       
+       mov eax, 0x80000070             ; load in smramc
+       out dx, eax
+       mov dx, 0xCFC
+       in byte al, dx
+       mov [esp-5], al
+       and al, 0xF3                    ; Allow graphics access
+       or al, 0x08
+       out dx, al
+       
+       xor eax, eax
+       mov dx, 0x3D4
+       in byte al, dx
+       mov [esp-6], al                 ; save off the old VGA command
+       mov al, 0xC
+       out dx, al
+       inc dx
+       in al, dx
+       mov ah, al
+       dec dx
+       mov al, 0xD
+       out dx, al
+       inc dx
+       in al, dx
+       shl eax, 1
+       add eax, 0xB8000                ; yay
+       mov byte [eax+0], '1'
+       mov byte [eax+1], 0xA0
+       mov byte [eax+2], '5'
+       mov byte [eax+3], 0xA0
+       mov byte [eax+4], '-'
+       mov byte [eax+5], 0xA0
+       mov byte [eax+6], '4'
+       mov byte [eax+7], 0xA0
+       mov byte [eax+8], '1'
+       mov byte [eax+9], 0xA0
+       mov byte [eax+10], '2'
+       mov byte [eax+11], 0xA0
+       
+       mov dx, 0x3D4
+       mov al, [esp-6]
+       out dx, al
+       
+
+       mov dx, 0xCFC                   ; restore smramc
+       mov al, [esp-5]
+       out dx, al
+
+       mov dx, 0xCF8                   ; restore the old config value
+       mov eax, [esp-4]
+       out dx, eax
+
+       mov al, 0x40                    ; ack the periodic IRQ
+       mov dx, 0x834
+       out dx, al
+       
+       mov dx, 0x830
+       in al, dx
+       or al, 0x02                     ; now ack the SMI itself
+       and al, 0xBF
+       out dx, al
+       or al, 0x40
+       out dx, al
+
+       rsm                             ; and leave SMM
+
+       align 0x4
+gdtr:
+       db 0x27, 0x00
+       dd (gdt + 0xA8000)
+       align 0x4
+gdt:
+       db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+       db 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x93, 0xCF, 0x00       ; data segment
+       db 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9B, 0xCF, 0x00       ; code segment
+       db 0xFF, 0xFF, 0x00, 0x80, 0x0A, 0x9B, 0xCF, 0x00       ; code segment for trampoline
+
+TIMES   512-($-$$) DB 0
+status:
+       dd 0xAA55AA55
+cstat:
+       db 0x00