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Undo test

This commit is contained in:
Adrien Bourmault 2018-12-22 12:19:17 +01:00
parent e3d7b77544
commit eac19a8ac7
5 changed files with 21 additions and 16 deletions
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BIN
bin/disk.img
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BIN
bin/mbr.bin
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obj/boot/mbr.bin
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2
src/boot/loader.s
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@ -415,5 +415,5 @@ ErrorNo64:
Die:
cli
hlt ; die nooooow
retf ; For conveniance '-'
retf
KERNEL:

33
src/boot/mbr.s
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@ -21,7 +21,7 @@
%define BUFFER_OFF 0x0000
;; SECOND STAGE LOADER "SEGMENT"
%define LOAD_SEG 0x0000 ; (LOAD_SEG << 4) + LOAD_OFF = 0x030000
%define LOAD_SEG 0x0000 ; (LOAD_SEG << 4) + LOAD_OFF = 0x001000
%define LOAD_OFF 0x1000
[BITS 16] ; Ensure 16-bit code (because fuck UEFI)
@ -60,6 +60,18 @@ _start:
jmp BOOT_SEG:$+5 ; Fix the cs:ip registers with a vaudou magical trip
bootstrap:
jmp bootstrapper
;; LOVELY DATA
FileNotFound db "FStage ERR : NO LOADER", 0 ; File was not found
DiskError db "FStage ERR : DISK", 0 ; Error while reading from the disk
UserData dw 0 ; Start of the data sectors
Bootdrv db 0 ; Boot Bootdrv number
filename db "LOADER BIN" ; Filename
;; GO !
bootstrapper:
mov ax, BOOT_SEG ; Set segments to the location of the bootloader
mov ds, ax
mov es, ax
@ -98,8 +110,8 @@ loadRoot:
mov al, byte [fats] ; Location of root dir = (fats * fatSectors) + reservedSectors
mul word [fatSectors] ; multiply by the sectors used
add ax, word [reservedSectors] ; increase ax by the reserved sectors
mov word [userData], ax ; Start of user data = startOfRoot + numberOfRoot
add word [userData], cx ; Add the size and location of the root directory
mov word [UserData], ax ; Start of user data = startOfRoot + numberOfRoot
add word [UserData], cx ; Add the size and location of the root directory
mov di, BUFFER_SEG ; Set the extra segment to the disk buffer
mov es, di
@ -123,7 +135,7 @@ searchRoot:
loop searchRoot ; Continue to search for the file
;; ERROR...
mov si, fileNotFound ; Could not find the file
mov si, FileNotFound ; Could not find the file
call print
;; REBOOT
@ -196,11 +208,11 @@ readClusters:
.clusterLoop:
xor bh, bh
xor dx, dx
push ax ; Get the cluster start = (cluster - 2) * sectorsPerCluster + userData
push ax ; Get the cluster start = (cluster - 2) * sectorsPerCluster + UserData
sub ax, 2 ; Subtract 2
mov bl, byte [sectorsPerCluster] ; Sectors per cluster is a byte value
mul bx ; multiply (cluster - 2) * sectorsPerCluster
add ax, word [userData] ; add the userData
add ax, word [UserData] ; add the UserData
xor ch, ch
mov cl, byte [sectorsPerCluster] ; Sectors to read
call readSectors ; Read the sectors
@ -287,7 +299,7 @@ readSectors:
int 0x13 ; Call int 13h (BIOS disk I/O)
dec di ; Decrease read attempt counter
jnz .attemptRead ; Try to read the sector again
mov si, diskError ; Error reading the disk :/
mov si, DiskError ; Error reading the disk :/
call print
jmp reboot
.readOk:
@ -328,13 +340,6 @@ print:
.done:
ret
;; LOVELY DATA
fileNotFound db "FStage ERR : NO LOADER", 0 ; File was not found
diskError db "FStage ERR : DISK", 0 ; Error while reading from the disk
userData dw 0 ; Start of the data sectors
Bootdrv db 0 ; Boot Bootdrv number
filename db "LOADER BIN" ; Filename
;; END
times 510 - ($ - $$) db 0 ; Pad remainder of boot sector with zeros
dw 0xaa55 ; Boot signature