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feat(tools): mkfs bootsector load loader

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d0p1 🏳️‍⚧️ 2024-08-29 16:14:09 +02:00
parent bdde64d171
commit e71ac0e1b1
3 changed files with 65 additions and 29 deletions
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4
tools/inspect/main.c
View file

@ -83,6 +83,10 @@ inspect(void)
printf(" gid: %hx\n", ip->inode.gid);
printf(" flags: %hx\n", ip->inode.flags);
printf(" size: %u\n", ip->inode.size);
for (idx = 0; idx < 10; idx++)
{
printf(" zone[%d]: 0x%X\n", idx, ip->inode.zones[idx]);
}
time = ip->inode.actime;
printf(" actime: %s", ctime(&time));
time = ip->inode.modtime;

83
tools/mkfs/boot.asm
View file

@ -1,11 +1,19 @@
[BITS 16]
[ORG 0x7c00]
; check reading reading media with lba
; read 2 first block (superblock & inode)
; validate that it's a StupidFS by checking magic
; check if inode 2 is present (loader reside in inode 2)
; get loader size
; iterate direct zone and load data to LOADER_BASE
; iterate double indirect and load data (in order to keep things simple we won't support loader > 69632 bytes)
LOADER_BASE equ 0x1000
DISK_BUFFER equ 0x8000
STPDFS_MAGIC equ 0x44505453
BLOCK_SIZE equ 512
INODE_SIZE equ 34
INODE_SIZE equ 0x46
INODE_ALLOCATED equ (1<<15)
CR equ 0xD
LF equ 0xA
@ -89,49 +97,61 @@ start:
cmp eax, STPDFS_MAGIC
jne .err_magic
; inode 0 bad
; inode 0 bad inode
; inode 1 root dir
; inode 2 is loader, let's keep things easy
mov ax, word [DISK_BUFFER + 512 + 0x46 * 2 + inode.flags]
mov ax, word [DISK_BUFFER + 512 + INODE_SIZE * 2 + inode.flags]
and ax, INODE_ALLOCATED
jz .err_no_loader
mov dword eax, [DISK_BUFFER + 512 + 0x46 * 2 + inode.size] ; size
mov dword eax, [DISK_BUFFER + 512 + INODE_SIZE * 2 + inode.size] ; size
mov dword [uFsize], eax
xchg bx, bx
; copy data to LOADER_BASE
mov ax, LOADER_BASE
mov es, ax
xor ecx, ecx
; direct read
xor edx, edx
mov eax, DISK_BUFFER + 0x46 * 2 + inode.zones ; first zone
.read_loop:
cmp dword ecx, [uFsize]
.direct_loop:
mov ax, es
movzx ecx, ax
sub ecx, LOADER_BASE
cmp ecx, [uFsize]
jg .all_read
.zone_loop:
cmp edx, 7
jb .zone_direct
.zone_triple:
.zone_double:
.zone_indirect:
.zone_direct:
mov eax, edx
shr eax, 2
add eax, DISK_BUFFER + 0x46 + 2 + inode.zones
shl eax, 2
add eax, DISK_BUFFER + 512 + INODE_SIZE * 2 + inode.zones
push edx
; copy block
mov eax, [eax]
mov cx, 1
xor bx, bx
call disk_read_sectors
pop edx
mov ax, es
add ax, BLOCK_SIZE
mov es, ax
inc edx
.end_zone:
add ecx, BLOCK_SIZE
jmp .read_loop
cmp edx, 8
jbe .direct_loop
.indirect_read:
; TODO
.all_read:
; jump to loader
mov dl, [bpb.drive_num]
jmp 0x0:LOADER_BASE
.err_no_loader:
mov si, szErrorNoLoader
call bios_print
@ -140,6 +160,10 @@ start:
mov si, szErrorNoLoader
call bios_print
jmp .end
.err_read:
mov si, szErrorRead
call bios_print
jmp .end
.err_lba:
mov si, szErrorLBA
call bios_print
@ -160,6 +184,7 @@ bios_print:
szErrorNoLoader: db "Loader not found", CR, LF, 0
szErrorBadMagic: db "Err: magic", CR, LF, 0
szErrorLBA: db "Err: LBA", CR, LF, 0
szErrorRead: db "Err: read", CR, LF, 0
uFsize: dd 0
disk_read_sectors:
@ -171,7 +196,7 @@ disk_read_sectors:
mov dl, [bpb.drive_num]
mov ah, 0x42
int 0x13
jc start.err_lba
jc start.err_read
ret
disk_packet:

7
tools/tools/copy.c
View file

@ -1,3 +1,5 @@
#include "libfs/inode.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
@ -67,6 +69,10 @@ do_copy(void)
}
ip = fs_inode_alloc(&super);
if (ip->valid == 0)
{
fs_inode_read(ip);
}
ip->inode.mode = st.st_mode;
ip->inode.uid = st.st_uid;
ip->inode.gid = st.st_gid;
@ -74,6 +80,7 @@ do_copy(void)
ip->inode.actime = st.st_atime;
ip->inode.flags = STPDFS_INO_FLAG_ALOC;
fs_inode_update(ip);
fp = fopen(src, "rb");