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iso9660

This commit is contained in:
JlXip 2021-02-21 03:45:24 +01:00
parent 8141ff540b
commit 34460c31a5
22 changed files with 637 additions and 37 deletions
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3
.gitignore vendored
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@ -7,11 +7,14 @@
/**/*.bin.gz
/**/*.elf
/**/*.hdd
/**/*.iso
/bochsout.txt
/bx_enh_dbg.ini
.vscode
/limine-install
!/limine.bin
!/limine-pxe.bin
!/limine-cd.bin
!/stage2.map
/stivale
/test_image

10
Makefile
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@ -29,6 +29,7 @@ install: all
bootloader: | decompressor stage2
gzip -n -9 < stage2/stage2.bin > stage2/stage2.bin.gz
cd bootsect && nasm bootsect.asm -fbin -o ../limine.bin
cd cdboot && nasm bootsect.asm -fbin -o ../limine-cd.bin
cd pxeboot && nasm bootsect.asm -fbin -o ../limine-pxe.bin
cp stage2/stage2.map ./
cp stage2/stage3.bin ./limine.sys
@ -118,3 +119,12 @@ fat32-test: test.hdd bootloader | all
rm -rf test_image loopback_dev
./limine-install ./ test.hdd
qemu-system-x86_64 -net none -smp 4 -enable-kvm -cpu host -hda test.hdd -debugcon stdio
iso9660-test: bootloader
$(MAKE) -C test
cp stage2.map test/
rm -rf test_image/
mkdir -p test_image/boot
cp -rv limine-cd.bin limine.sys stage2/stages.bin test/* test_image/boot/
genisoimage -no-emul-boot -b boot/limine-cd.bin -o test.iso test_image/
qemu-system-x86_64 -net none -smp 4 -enable-kvm -cpu host -cdrom test.iso -debugcon stdio

109
cdboot/bootsect.asm Normal file
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@ -0,0 +1,109 @@
BITS 16
ORG 0x7C00
; Please read bootsect/bootsect.asm before this file
%define ISO9660_BUFFER 0x8000
%define ROOT_DIRECTORY 156
%define ROOT_DIRECTORY_BUFFER (ISO9660_BUFFER + ROOT_DIRECTORY)
%define DIRECTORY_RECORD_LENGTH 0
%define DIRECTORY_RECORD_LBA 2
%define DIRECTORY_RECORD_SIZE 10
%define DIRECTORY_RECORD_FILENAME_LENGTH 32
%define DIRECTORY_RECORD_FILENAME 33
%define BOOT_FROM_CD 2
jmp skip_bpb
nop
times 87 db 0
skip_bpb:
cli
cld
jmp 0x0000:.initialise_cs
.initialise_cs:
xor ax, ax
mov ds, ax
mov es, ax
mov ss, ax
mov sp, 0x7C00
sti
; int 13h?
mov ah, 0x41
mov bx, 0x55AA
int 0x13
jc err
cmp bx, 0xAA55
jne err
mov esp, 0x7C00
; --- Load the stage 2 ---
; Find and load the PVD
call findPVD
jc err
; Load the root directory
mov eax, dword [ROOT_DIRECTORY_BUFFER + DIRECTORY_RECORD_LBA]
mov ecx, dword [ROOT_DIRECTORY_BUFFER + DIRECTORY_RECORD_SIZE]
mov esi, ecx ; Size, for read_file
add ecx, 2047
shr ecx, 11
call read_2k_sectors
jc err
; Find and load '/BOOT'
mov ebx, TXT_BOOT
mov cl, TXT_BOOT_SZ
call read_file
jc err
; Find and load '/BOOT/STAGES.BIN'
mov ebx, TXT_STAGES
mov cl, TXT_STAGES_SZ
call read_file ; esi is set from the last call
jc err
; Enable GDT
lgdt [gdt]
cli
mov eax, cr0
or al, 1
mov cr0, eax
jmp 0x08:pmode
err:
hlt
jmp err
%include 'iso9660.asm'
%include '../bootsect/gdt.inc'
BITS 32
pmode:
mov eax, 0x10
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
; Time to handle control over to the stage 2
push BOOT_FROM_CD
and edx, 0xFF
push edx ; Boot drive
call ISO9660_BUFFER
hlt
TXT_BOOT: db "BOOT"
TXT_BOOT_SZ equ $ - TXT_BOOT
TXT_STAGES: db "STAGES.BIN;1"
TXT_STAGES_SZ equ $ - TXT_STAGES
; Just making sure the entry point (ISO9660_BUFFER) is not reached
times (0x8000 - 0x7C00) - ($ - $$) db 0

58
cdboot/findFile.asm Normal file
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@ -0,0 +1,58 @@
BITS 16
; --- Find file in directory ---
; IN:
; eax <- directory extent
; ebx <- ptr to filename
; cl <- filename sz
; esi <- size of directory extent
; OUT:
; eax <- LBA of the extent
; ebx <- size in bytes
; Carry if not found
; SMASHES:
; ch
findFile:
push edx
push edi
push esi
mov edx, eax
.checkEntry:
; Get the size of this entry
mov edi, dword [edx + DIRECTORY_RECORD_LENGTH]
and edi, 0xFF
; Check filename size
mov al, byte [edx + DIRECTORY_RECORD_FILENAME_LENGTH]
cmp al, cl
jnz .gonext
; Sizes match, check filename
lea eax, dword [edx + DIRECTORY_RECORD_FILENAME]
call strcmp
jnc .found
; Go to the next
.gonext:
add edx, edi
sub esi, edi
test esi, esi
jnz .checkEntry
.notfound:
stc
jmp .end
.found:
clc
mov eax, [edx + DIRECTORY_RECORD_LBA]
mov ebx, [edx + DIRECTORY_RECORD_SIZE]
.end:
pop esi
pop edi
pop edx
ret
%include 'strcmp.asm'

51
cdboot/findPVD.asm Normal file
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@ -0,0 +1,51 @@
BITS 16
; --- Find primary volume descriptor ---
; IN:
; dl <- drive number
; OUT:
; [ISO9660_BUFFER] <- PVD
; Carry if not found
findPVD:
pusha
; Just start reading volume descriptors
mov eax, 0x10 ; First volume descriptor's LBA
.checkVD:
mov cx, 1 ; Each volume descriptor is 2KB
call read_2k_sectors
; Check identifier
mov ecx, ISO9660_BUFFER
inc ecx
mov bl, byte [ecx]
inc ecx
mov ecx, dword [ecx]
cmp bl, 'C'
jne .notfound
cmp ecx, 0x31303044
jne .notfound
; Check type = 0xFF (final)
mov ecx, ISO9660_BUFFER
mov bl, byte [ecx]
cmp bl, 0xFF
jz .notfound
; Check type = 0x01 (PVD)
cmp bl, 0x01
jz .found
; Didn't match, go to the next
inc eax
jmp .checkVD
.found:
clc
jmp .end
.notfound:
stc
.end:
popa
ret

35
cdboot/iso9660.asm Normal file
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@ -0,0 +1,35 @@
BITS 16
%include 'read_2k_sectors.asm'
%include 'findPVD.asm'
%include 'findFile.asm'
; --- Read file ---
; IN:
; ebx <- ptr to filename
; cl <- filename sz
; esi <- size of directory extent
; OUT:
; If found: [ISO9660_BUFFER] <- contents of the file
; If not found: CF=1
; esi <- size in bytes
; SMASHES:
; eax, ebx, ecx
read_file:
mov eax, ISO9660_BUFFER
call findFile
jc .end
; LBA of the extent is now @ eax
; ebx is size in bytes
mov esi, ebx ; Return value
; bytes to 2k sectors
mov ecx, ebx
add ecx, 2047
shr ecx, 11
call read_2k_sectors
.end:
ret

30
cdboot/read_2k_sectors.asm Normal file
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@ -0,0 +1,30 @@
BITS 16
; --- Read sectors from disk ---
; IN:
; eax <- start LBA (2k sectors)
; cx <- number of 2k sectors
; dl <- drive number
; ds <- ZERO
; OUT:
; Carry if error
align 8
dapack:
dapack_size: db 0x10
dapack_null: db 0x00
dapack_nblocks: dw 0
dapack_buffer: dd ISO9660_BUFFER
dapack_LBA: dq 0
read_2k_sectors:
pusha
mov dword [dapack_LBA], eax
mov word [dapack_nblocks], cx
mov ah, 0x42
mov si, dapack
int 0x13
popa
ret

34
cdboot/strcmp.asm Normal file
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@ -0,0 +1,34 @@
BITS 16
; --- Compare strings ---
; IN:
; eax <- ptr to first string
; ebx <- ptr to second string
; cl <- size of BOTH strings (must be the same)
; OUT:
; CF=0 if equal, CF=1 otherwise
strcmp:
pusha
.nextchar:
mov dh, byte [eax]
mov dl, byte [ebx]
cmp dh, dl
jnz .notequal
; Characters match
dec cl
test cl, cl
jz .equal
inc eax
inc ebx
jmp .nextchar
.equal:
clc
jmp .end
.notequal:
stc
.end:
popa
ret

BIN
limine-cd.bin Normal file
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Binary file not shown.

BIN
limine-pxe.bin
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Binary file not shown.

BIN
limine.bin
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Binary file not shown.

BIN
limine.sys
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Binary file not shown.

15
stage2/fs/file.c
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@ -4,6 +4,7 @@
#include <fs/echfs.h>
#include <fs/ext2.h>
#include <fs/fat32.h>
#include <fs/iso9660.h>
#include <lib/blib.h>
#include <mm/pmm.h>
#include <lib/part.h>
@ -23,6 +24,20 @@ bool fs_get_guid(struct guid *guid, struct volume *part) {
int fopen(struct file_handle *ret, struct volume *part, const char *filename) {
ret->is_memfile = false;
if (iso9660_check_signature(part)) {
struct iso9660_file_handle *fd = ext_mem_alloc(sizeof(struct iso9660_file_handle));
int r = iso9660_open(fd, part, filename);
if (r)
return r;
ret->fd = (void *)fd;
ret->read = (void *)iso9660_read;
ret->size = fd->size;
return 0;
}
if (echfs_check_signature(part)) {
struct echfs_file_handle *fd = ext_mem_alloc(sizeof(struct echfs_file_handle));

197
stage2/fs/iso9660.c Normal file
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@ -0,0 +1,197 @@
#include <fs/iso9660.h>
#include <lib/blib.h>
#include <lib/libc.h>
#include <mm/pmm.h>
#define ISO9660_FIRST_VOLUME_DESCRIPTOR 0x10
#define ISO9660_VOLUME_DESCRIPTOR_SIZE ISO9660_SECTOR_SIZE
#define ROCK_RIDGE_MAX_FILENAME 255
// --- Both endian structures ---
struct BE16_t { uint16_t little, big; } __attribute__((packed));
struct BE32_t { uint32_t little, big; } __attribute__((packed));
// --- Directory entries ---
struct iso9660_directory_entry {
uint8_t length;
uint8_t extended_attribute_length;
struct BE32_t extent;
struct BE32_t extent_size;
uint8_t datetime[7];
uint8_t flags;
uint8_t interleaved_unit_size;
uint8_t interleaved_gap_size;
struct BE16_t volume_seq;
uint8_t filename_size;
} __attribute__((packed));
// --- Volume descriptors ---
// VDT = Volume Descriptor Type
enum {
ISO9660_VDT_BOOT_RECORD,
ISO9660_VDT_PRIMARY,
ISO9660_VDT_SUPPLEMENTARY,
ISO9660_VDT_PARTITION_DESCRIPTOR,
ISO9660_VDT_TERMINATOR = 255
};
struct iso9660_volume_descriptor {
uint8_t type;
char identifier[5];
uint8_t version;
uint8_t data[2041];
} __attribute__((packed));
struct iso9660_primary_volume {
uint8_t type;
char standard_identifier[5];
uint8_t version;
uint8_t unused0[1];
char system_identifier[32];
char volume_identifier[32];
uint8_t unused1[8];
struct BE32_t space_size;
uint8_t unused2[32];
struct BE16_t set_size;
struct BE16_t volume_seq;
struct BE16_t LBA_size;
struct BE32_t path_table_size;
uint32_t LBA_path_table_little;
uint32_t LBA_optional_path_table_little;
uint32_t LBA_path_table_big;
uint32_t LBA_optional_path_table_big;
struct iso9660_directory_entry root;
uint8_t no_one_cares[1858];
} __attribute__((packed));
// --- Implementation ---
// Cached root
static void *root = NULL;
static uint32_t root_size = 0;
static void iso9660_find_PVD(struct iso9660_volume_descriptor *desc, struct volume *vol) {
uint32_t lba = ISO9660_FIRST_VOLUME_DESCRIPTOR;
while (true) {
volume_read(vol, desc, lba * ISO9660_SECTOR_SIZE, ISO9660_SECTOR_SIZE);
switch (desc->type) {
case ISO9660_VDT_PRIMARY:
return;
case ISO9660_VDT_TERMINATOR:
panic("ISO9660: no primary volume descriptor");
break;
}
++lba;
}
}
static void iso9660_cache_root(struct volume *vol) {
struct iso9660_primary_volume pv;
iso9660_find_PVD((struct iso9660_volume_descriptor *)&pv, vol);
root_size = pv.root.extent_size.little;
root = ext_mem_alloc(root_size);
volume_read(vol, root, pv.root.extent.little * ISO9660_SECTOR_SIZE, root_size);
}
static int iso9660_strcmp(const char *a, const char *b, size_t size) {
while (size--) {
char ca = *a++;
char cb = *b++;
if (!(ca == cb || (ca - ('a'-'A')) == cb))
return 1;
}
return 0;
}
static struct iso9660_directory_entry *iso9660_find(void *buffer, uint32_t size, const char *filename) {
// The file can be either FILENAME or FILENAME;1
uint32_t len = strlen(filename);
char finalfile[len + 2];
strcpy(finalfile, filename);
finalfile[len + 0] = ';';
finalfile[len + 1] = '1';
while (size) {
struct iso9660_directory_entry *entry = buffer;
char* entry_filename = (char*)entry + sizeof(struct iso9660_directory_entry);
if (!entry->length) {
return NULL;
} else if (entry->filename_size == len && !iso9660_strcmp(filename, entry_filename, len)) {
return buffer;
} else if (entry->filename_size == len+2 && !iso9660_strcmp(finalfile, entry_filename, len+2)) {
return buffer;
} else {
size -= entry->length;
buffer += entry->length;
}
}
return NULL;
}
// --- Public functions ---
int iso9660_check_signature(struct volume *vol) {
char buf[6];
const uint64_t signature = ISO9660_FIRST_VOLUME_DESCRIPTOR * ISO9660_SECTOR_SIZE + 1;
volume_read(vol, buf, signature, 5);
buf[5] = '\0';
return !strcmp(buf, "CD001");
}
int iso9660_open(struct iso9660_file_handle *ret, struct volume *vol, const char *path) {
// Is the root directory cached?
if (!root)
iso9660_cache_root(vol);
ret->context.vol = *vol;
ret->context.root = root;
ret->context.root_size = root_size;
while (*path == '/')
++path;
struct iso9660_directory_entry *current = root;
uint32_t current_size = root_size;
uint32_t next_sector = 0;
uint32_t next_size = 0;
char filename[ROCK_RIDGE_MAX_FILENAME];
while (true) {
char *aux = filename;
while (!(*path == '/' || *path == '\0'))
*aux++ = *path++;
*aux = '\0';
struct iso9660_directory_entry *entry = iso9660_find(current, current_size, filename);
if (!entry)
return 1; // Not found :(
next_sector = entry->extent.little;
next_size = entry->extent_size.little;
if (*path++ == '\0')
break; // Found :)
current_size = next_size;
current = ext_mem_alloc(current_size);
volume_read(vol, current, next_sector * ISO9660_SECTOR_SIZE, current_size);
}
ret->LBA = next_sector;
ret->size = next_size;
return 0;
}
int iso9660_read(struct iso9660_file_handle *file, void *buf, uint64_t loc, uint64_t count) {
volume_read(&file->context.vol, buf, file->LBA * ISO9660_SECTOR_SIZE + loc, count);
return 0;
}

25
stage2/fs/iso9660.h Normal file
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@ -0,0 +1,25 @@
#ifndef __FS__ISO9660_H__
#define __FS__ISO9660_H__
#include <stdint.h>
#include <lib/part.h>
#define ISO9660_SECTOR_SIZE (2 << 10)
struct iso9660_context {
struct volume vol;
void* root;
uint32_t root_size;
};
struct iso9660_file_handle {
struct iso9660_context context;
uint32_t LBA;
uint32_t size;
};
int iso9660_check_signature(struct volume *vol);
int iso9660_open(struct iso9660_file_handle *ret, struct volume *vol, const char *path);
int iso9660_read(struct iso9660_file_handle *file, void *buf, uint64_t loc, uint64_t count);
#endif

2
stage2/lib/blib.c
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@ -11,6 +11,8 @@ uint8_t boot_drive;
int boot_partition = -1;
bool booted_from_pxe = false;
bool booted_from_cd = false;
bool stage3_already_loaded = false;
bool parse_resolution(int *width, int *height, int *bpp, const char *buf) {
int res[3] = {0};

2
stage2/lib/blib.h
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@ -9,6 +9,8 @@ extern uint8_t boot_drive;
extern int boot_partition;
extern bool booted_from_pxe;
extern bool booted_from_cd;
extern bool stage3_already_loaded;
bool parse_resolution(int *width, int *height, int *bpp, const char *buf);

2
stage2/lib/config.c
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@ -19,6 +19,7 @@ static char *config_addr;
extern symbol stage3_addr;
int init_config_disk(struct volume *part) {
if (!stage3_already_loaded) {
struct file_handle stage3;
if (fopen(&stage3, part, "/limine.sys")
@ -27,6 +28,7 @@ int init_config_disk(struct volume *part) {
}
fread(&stage3, stage3_addr, 0, stage3.size);
}
struct file_handle f;

4
stage2/lib/part.c
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@ -254,7 +254,7 @@ static size_t volume_index_i = 0;
void volume_create_index(void) {
size_t volume_count = 0;
for (uint8_t drive = 0x80; drive < 0x8f; drive++) {
for (uint8_t drive = 0x80; drive; drive++) {
struct rm_regs r = {0};
struct bios_drive_params drive_params;
@ -298,7 +298,7 @@ void volume_create_index(void) {
volume_index = ext_mem_alloc(sizeof(struct volume) * volume_count);
for (uint8_t drive = 0x80; drive < 0x8f; drive++) {
for (uint8_t drive = 0x80; drive; drive++) {
struct rm_regs r = {0};
struct bios_drive_params drive_params;

8
stage2/lib/uri.c
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@ -94,10 +94,10 @@ static bool parse_bios_partition(char *loc, uint8_t *drive, uint8_t *partition)
static bool uri_bios_dispatch(struct file_handle *fd, char *loc, char *path) {
uint8_t drive, partition;
struct volume volume;
if (!parse_bios_partition(loc, &drive, &partition))
return false;
struct volume volume;
if (!volume_get_by_coord(&volume, drive, partition))
return false;
@ -154,7 +154,7 @@ static bool uri_boot_dispatch(struct file_handle *fd, char *s_part, char *path)
if (booted_from_pxe)
return uri_tftp_dispatch(fd, s_part, path);
uint8_t partition;
int partition;
if (s_part[0] != '\0') {
uint64_t val = strtoui(s_part, NULL, 10);
@ -162,13 +162,11 @@ static bool uri_boot_dispatch(struct file_handle *fd, char *s_part, char *path)
panic("Partition number outside range 1-256");
}
partition = val - 1;
} else {
if (boot_partition != -1) {
} else if (booted_from_cd || boot_partition != -1) {
partition = boot_partition;
} else {
panic("Boot partition information is unavailable.");
}
}
struct volume part;
if (!volume_get_by_coord(&part, boot_drive, partition))

41
stage2/main.c
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@ -20,10 +20,18 @@
#include <pxe/pxe.h>
#include <pxe/tftp.h>
void entry(uint8_t _boot_drive, int pxe_boot) {
enum {
BOOT_FROM_HDD,
BOOT_FROM_PXE,
BOOT_FROM_CD
};
void entry(uint8_t _boot_drive, int boot_from) {
boot_drive = _boot_drive;
booted_from_pxe = pxe_boot;
booted_from_pxe = (boot_from == BOOT_FROM_PXE);
booted_from_cd = (boot_from == BOOT_FROM_CD);
stage3_already_loaded = booted_from_cd; // CD loads both stages
mtrr_save();
@ -37,20 +45,15 @@ void entry(uint8_t _boot_drive, int pxe_boot) {
init_e820();
init_memmap();
struct volume part;
volume_create_index();
if (pxe_boot) {
pxe_init();
if (init_config_pxe()) {
panic("Failed to load config file");
}
print("Config loaded via PXE\n");
} else {
switch (boot_from) {
case BOOT_FROM_HDD:
print("Boot drive: %x\n", boot_drive);
// Look for config file.
print("Searching for config file...\n");
for (int i = 0; ; i++) {
struct volume part;
int ret = volume_get_by_coord(&part, boot_drive, i);
switch (ret) {
case INVALID_TABLE:
@ -66,6 +69,22 @@ void entry(uint8_t _boot_drive, int pxe_boot) {
break;
}
}
break;
case BOOT_FROM_PXE:
pxe_init();
if (init_config_pxe()) {
panic("Failed to load config file");
}
print("Config loaded via PXE\n");
break;
case BOOT_FROM_CD:
boot_partition = -1; // raw device
volume_get_by_coord(&part, boot_drive, boot_partition);
if (init_config_disk(&part))
panic("Failed to load config file");
break;
}
trace_init();
@ -81,7 +100,7 @@ void entry(uint8_t _boot_drive, int pxe_boot) {
if (!strcmp(proto, "stivale")) {
stivale_load(config, cmdline);
} else if (!strcmp(proto, "stivale2")) {
stivale2_load(config, cmdline, pxe_boot);
stivale2_load(config, cmdline, boot_from);
} else if (!strcmp(proto, "linux")) {
linux_load(config, cmdline);
} else if (!strcmp(proto, "chainload")) {

30
test/limine.cfg
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@ -5,48 +5,48 @@ GRAPHICS=yes
MENU_RESOLUTION=1024x768
MENU_FONT=boot:///boot/font.bin
E9_OUTPUT=yes
STAGE2_MAP=bios://:1/boot/stage2.map
STAGE2_MAP=boot:///boot/stage2.map
THEME_COLOURS=60000000;aa0000;00aaff;aa5500;0000aa;aa00aa;9076de;aaaaaa
THEME_MARGIN=64
BACKGROUND_PATH=bios://:1/boot/bg.bmp
BACKGROUND_PATH=boot:///boot/bg.bmp
:+Legacy
::Stivale Test
PROTOCOL=stivale
KERNEL_PATH=boot://1/boot/test.elf
KERNEL_PATH=boot:///boot/test.elf
KERNEL_CMDLINE=Hi! This is an example!
MODULE_PATH=bios://:1/boot/test.elf
MODULE_PATH=boot:///boot/test.elf
MODULE_STRING=yooooo
MODULE_PATH=bios://:1/boot/bg.bmp
MODULE_PATH=boot:///boot/bg.bmp
MODULE_STRING=yooooo
::Stivale Test (KASLR)
PROTOCOL=stivale
KASLR=yes
KERNEL_PATH=boot://1/boot/test.elf
KERNEL_PATH=boot:///boot/test.elf
KERNEL_CMDLINE=Hi! This is an example!
MODULE_PATH=bios://:1/boot/test.elf
MODULE_PATH=boot:///boot/test.elf
MODULE_STRING=yooooo
MODULE_PATH=bios://:1/boot/bg.bmp
MODULE_PATH=boot:///boot/bg.bmp
MODULE_STRING=yooooo
:Stivale2 Test
PROTOCOL=stivale2
RESOLUTION=640x480x16
KERNEL_PATH=bios://:1/boot/test.elf
KERNEL_PATH=boot:///boot/test.elf
KERNEL_CMDLINE=Woah! Another example!
MODULE_PATH=bios://:1/boot/bg.bmp
MODULE_PATH=boot:///boot/bg.bmp
MODULE_STRING=yooooo
:Stivale2 Test (KASLR)
@ -54,6 +54,16 @@ MODULE_STRING=yooooo
PROTOCOL=stivale2
RESOLUTION=640x480x16
KASLR=yes
KERNEL_PATH=boot:///boot/test.elf
KERNEL_CMDLINE=Woah! Another example!
MODULE_PATH=boot:///boot/bg.bmp
MODULE_STRING=yooooo
:Test bios://
PROTOCOL=stivale2
RESOLUTION=640x480x16
KERNEL_PATH=bios://:1/boot/test.elf
KERNEL_CMDLINE=Woah! Another example!