Rehaul the memory map

[nameless-os.git] / boot / x86 / mbr.s

diff --git a/boot/x86/mbr.s b/boot/x86/mbr.s
index 613b24894d993a26fac2891e3ecad4768028cb7d..b5d01c94f6ea86ccffd0752714db580280b6abce 100644 (file)
--- a/boot/x86/mbr.s
+++ b/boot/x86/mbr.s
@@ -11,7 +11,7 @@ _start:
        mov ds, ax
        mov es, ax
        mov ss, ax
-       mov sp, 0x7c00 ; just under the soon-to-be-loaded VBR, should be more than sufficient space
+       mov sp, 0xfe00 ; just under the soon-to-be-loaded VBR, should be more than sufficient space
 
        ; perform self-relocation
        cld
@@ -54,16 +54,16 @@ real_start:
        .load_vbr:
                ; load active partition's VBR
                pop si
-               mov ax, 0x7c0
+               mov ax, 0xfe0
                add si, 8
                mov edx, [si]
                xor bx, bx
                call read_sector
                ; check is the VBR bootable (ends with 0x55 0xaa), if not halt
-               cmp word [0x7dfe], 0xaa55
+               cmp word [0xfffe], 0xaa55
                jne .not_bootable
                mov dl, [BOOT_DRIVE]
-               call 0x7c00
+               call 0xfe00
                .not_bootable:
                        mov si, no_os
                        call print