X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/75d972ddb29f36496e630be12d85962eec209eed..ff4dc66d05141fdf63ad1c9c4e8f6a4aa5397119:/aseg/aseg.asm?ds=sidebyside

diff --git a/aseg/aseg.asm b/aseg/aseg.asm
index 51a2811..244cafc 100644
--- a/aseg/aseg.asm
+++ b/aseg/aseg.asm
@@ -1,48 +1,33 @@
-	org 0x0
+	org 0xA8000
 [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.
+	jmp 0xA800:(entry2-0xA8000)	; Long jump to a correct cs.
 entry2:
-;	mov al, 0x02
-;	out 0x80, al
-	lgdt [gdtr]			; Set up a new GDT.
+	lgdt [(gdtr-0xA8000)]		; 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.
+	jmp long 0x10:continue		; 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 esp, [dataptr]
 
-;	mov al, 0x05
+;	mov al, [cstat]
+;	add al, 1
 ;	out 0x80, al
-
-	mov al, [(cstat + 0xA8000)]
-	add al, 1
-	out 0x80, al
-	mov [(cstat + 0xA8000)], al
+;	mov [cstat], 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
@@ -73,38 +58,50 @@ continue:
 	shl eax, 1
 	add eax, 0xB8000		; yay
 	mov byte [eax+0], '1'
-	mov byte [eax+1], 0xA0
+	mov byte [eax+1], 0x1F
 	mov byte [eax+2], '5'
-	mov byte [eax+3], 0xA0
+	mov byte [eax+3], 0x1F
 	mov byte [eax+4], '-'
-	mov byte [eax+5], 0xA0
+	mov byte [eax+5], 0x1F
 	mov byte [eax+6], '4'
-	mov byte [eax+7], 0xA0
+	mov byte [eax+7], 0x1F
 	mov byte [eax+8], '1'
-	mov byte [eax+9], 0xA0
+	mov byte [eax+9], 0x1F
 	mov byte [eax+10], '2'
-	mov byte [eax+11], 0xA0
+	mov byte [eax+11], 0x1F
 	
-	mov dx, 0x3D4
+	mov dx, 0x3D4			; restore the old stuff
 	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 dx, 0xCF8			; restore the old PCI config value
 	mov eax, [esp-4]
 	out dx, eax
 
+	mov al, [needclear]
+	cmp al, 0
+	jz noclear
+	mov al, 0			; clear BSS
+	mov edi, [dataptr+4]
+	mov ecx, [dataptr+8]
+	rep stosb
+	mov [needclear], al
+	
+noclear:
+	mov eax, [dataptr+12]		; jump into C
+	call eax
+
 	mov al, 0x40			; ack the periodic IRQ
 	mov dx, 0x834
 	out dx, al
 	
-	mov dx, 0x830
+	mov dx, 0x830			; now ack the SMI itself
 	in al, dx
-	or al, 0x02			; now ack the SMI itself
+	or al, 0x02
 	and al, 0xBF
 	out dx, al
 	or al, 0x40
@@ -112,10 +109,13 @@ continue:
 
 	rsm				; and leave SMM
 
+needclear:
+	db 0x01
+
 	align 0x4
 gdtr:
 	db 0x27, 0x00
-	dd (gdt + 0xA8000)
+	dd gdt
 	align 0x4
 gdt:
 	db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
@@ -123,8 +123,12 @@ gdt:
 	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-($-$$) DB 0
-status:
-	dd 0xAA55AA55
 cstat:
 	db 0x00
+
+TIMES   512-($-$$) DB 0
+dataptr:
+	; 4 bytes of stack top
+	; 4 bytes of BSS start
+	; 4 bytes of BSS length
+	; 4 bytes of C entry point
\ No newline at end of file