diff options
| author | iximeow <me@iximeow.net> | 2015-09-28 03:33:19 -0700 |
|---|---|---|
| committer | iximeow <me@iximeow.net> | 2015-09-28 03:36:28 -0700 |
| commit | 74057dac1d460574f0b7edb89e9e4125a69c885a (patch) | |
| tree | 8bd43ea888b33272d21719c7f97c51db1bc58c57 /bootloader.asm | |
| parent | 4f63bab19769e2aedb9721322501cecf9934156c (diff) | |
add awful support for non-0x7e00 start, prefix real start address to kernel
Diffstat (limited to 'bootloader.asm')
| -rw-r--r-- | bootloader.asm | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/bootloader.asm b/bootloader.asm index c9ed98b..7d218eb 100644 --- a/bootloader.asm +++ b/bootloader.asm @@ -13,7 +13,7 @@ start: call verify_read mov si, READ_NERR call write_str - jmp 0x7e00 + jmp word [0x7dfc] jmp hang read_err: @@ -23,17 +23,18 @@ hang: jmp hang verify_read: + mov bx, word [0x7dfc] mov al, 0x66 - cmp al, [0x7e00] + cmp al, byte [bx] jne read_err mov al, 0x55 - cmp al, [0x7e01] + cmp al, byte [bx+1] jne read_err mov al, 0x66 - cmp al, [0x7e02] + cmp al, byte [bx+2] jne read_err mov al, 0x89 - cmp al, [0x7e03] + cmp al, byte [bx+3] jne read_err ret @@ -106,7 +107,7 @@ LBA_DISK_READ_PACKET: db 0x10 db 0 dw 32 ; number of blocks to read, reset to # actually read when done - dw 0x7e00 ; read destination address + dw 0x7dfc ; read destination address dw 0x0000 dd 1 ; lba to read from dd 0 ; for extended lba adresses (not really used here) |