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Commit bc43dbb6 authored by Jacob Lorentzon's avatar Jacob Lorentzon
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Move the store function away from the bootsector.

parent 1a2af2cb
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1 merge request!3Support booting from MBR disks
......@@ -86,45 +86,6 @@ load:
jc error
ret
; store some sectors to disk from a buffer in memory
; buffer has to be below 1MiB
; IN
; ax: start sector
; bx: offset of buffer
; cx: number of sectors (512 Bytes each)
; dx: segment of buffer
; CLOBBER
; ax, bx, cx, dx, si
; TODO rewrite to (eventually) move larger parts at once
; if that is done increase buffer_size_sectors in startup-common to that (max 0x80000 - startup_end)
store:
cmp cx, 127
jbe .good_size
pusha
mov cx, 127
call store
popa
add ax, 127
add dx, 127 * 512 / 16
sub cx, 127
jmp store
.good_size:
mov [DAPACK.addr], eax
mov [DAPACK.buf], bx
mov [DAPACK.count], cx
mov [DAPACK.seg], dx
call print_dapack
mov dl, [disk]
mov si, DAPACK
mov ah, 0x43
int 0x13
jc error
ret
print_dapack:
mov al, 13
call print_char
......
......@@ -16,3 +16,42 @@ save_config:
xor dx, dx
call store
ret
; store some sectors to disk from a buffer in memory
; buffer has to be below 1MiB
; IN
; ax: start sector
; bx: offset of buffer
; cx: number of sectors (512 Bytes each)
; dx: segment of buffer
; CLOBBER
; ax, bx, cx, dx, si
; TODO rewrite to (eventually) move larger parts at once
; if that is done increase buffer_size_sectors in startup-common to that (max 0x80000 - startup_end)
store:
cmp cx, 127
jbe .good_size
pusha
mov cx, 127
call store
popa
add ax, 127
add dx, 127 * 512 / 16
sub cx, 127
jmp store
.good_size:
mov [DAPACK.addr], eax
mov [DAPACK.buf], bx
mov [DAPACK.count], cx
mov [DAPACK.seg], dx
call print_dapack
mov dl, [disk]
mov si, DAPACK
mov ah, 0x43
int 0x13
jc error
ret
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