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Parse ramdisk tar file

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This commit is contained in:
Kamil Kowalczyk
2025-12-11 02:05:38 +01:00
parent 172859831d
commit 412db850a0
11 changed files with 152 additions and 2 deletions
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3
Makefile
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@ -4,11 +4,12 @@ include build/make.help
srctree := $(PWD)
include platform/make.$(platform)
include distrib/make.distrib
kernel:
$(make) -C $(srctree)/kernel srctree=$(srctree) all
clean: platform_clean
clean: platform_clean distrib_clean
$(make) -C $(srctree)/kernel srctree=$(srctree) clean
.hidden:

1
distrib/etc/file.txt Normal file
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@ -0,0 +1 @@
Hello file

8
distrib/make.distrib Normal file
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@ -0,0 +1,8 @@
distrib_prepare:
tar -cvf $(srctree)/out/ramdisk.tar -C $(srctree)/distrib .
distrib_clean:
rm -f $(srctree)/out/ramdisk.tar
.PHONY: distrib_prepare distrib_clean

1
kernel/make.src
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@ -7,3 +7,4 @@ include libk/make.src
include sync/make.src
include mm/make.src
include irq/make.src
include ramdisk/make.src

12
kernel/platform/i386_pc/boot/bootmain.c
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@ -43,6 +43,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <mm/bba.h>
#include <mm/liballoc.h>
#include <mm/mregmap.h>
#include <ramdisk/tar.h>
#include <config.h>
extern byte_t __kernel_end;
@ -94,9 +95,17 @@ static void mregmap_init1(void) {
}
}
static void pmm_init1(void) {
static void ramdisk_init(void) {
struct multiboot *mb = multiboot_get();
/* TODO: for now we assert that the first module is the ramdisk */
struct multiboot_mod_list *module = (struct multiboot_mod_list *)((uptr_t)mb->mods_addr + VIRT_BASE);
uptr_t module_start = (uptr_t)module->mod_start + VIRT_BASE;
usize_t total = tar_parse(module_start);
dbgf("ramdisk: total=%zu\n", total);
}
static void pmm_init1(void) {
struct mreg *avail_ram = mregmap_first_avail();
usize_t usable_ram_bytes = avail_ram->size;
@ -135,6 +144,7 @@ void bootmain(void *mbootptr) {
pmm_init1();
bba_init();
mm_init();
ramdisk_init();
pit_init();
__asm__ volatile("sti");

1
kernel/ramdisk/.gitignore vendored Normal file
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@ -0,0 +1 @@
*.o

5
kernel/ramdisk/make.src Normal file
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@ -0,0 +1,5 @@
dir_tar1 := $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
c_files += $(dir_tar1)/tar.c
o_files += $(dir_tar1)/tar.o

68
kernel/ramdisk/tar.c Normal file
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@ -0,0 +1,68 @@
/*
Copyright 2025 Kamil Kowalczyk
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <libk/types.h>
#include <ramdisk/tar.h>
static struct tar_header *ramdisk_tar_headers[TAR_MAX];
usize_t tar_get_size(const byte_t *input) {
usize_t size = 0;
usize_t j;
usize_t count = 1;
for (j = 11; j > 0; j--, count *= 8)
size += ((input[j - 1] - '0') * count);
return size;
}
usize_t tar_parse(uptr_t addr) {
usize_t i;
for (i = 0; ; i++) {
struct tar_header *header = (struct tar_header *)addr;
if (header->filename[i] == '\0')
break;
usize_t size = tar_get_size(header->size);
ramdisk_tar_headers[i] = header;
addr += ((size / 512) + 1) * 512;
if (size % 512)
addr += 512;
}
return i;
}

53
kernel/ramdisk/tar.h Normal file
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@ -0,0 +1,53 @@
/*
Copyright 2025 Kamil Kowalczyk
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RAMDISK_TAR_H
#define _RAMDISK_TAR_H
#include <libk/types.h>
#define TAR_MAX 64
struct tar_header {
byte_t filename[100];
byte_t mode[8];
byte_t uid[8];
byte_t gid[8];
byte_t size[12];
byte_t mtime[12];
byte_t checksum[8];
byte_t typeflag[1];
};
usize_t tar_get_size(const byte_t *input);
usize_t tar_parse(uptr_t addr);
#endif // _RAMDISK_TAR_H

1
platform/i386_pc/grub.cfg
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@ -3,5 +3,6 @@ set default=0
menuentry "mop3" {
multiboot /boot/kernel.elf
module /boot/ramdisk.tar
boot
}

1
platform/make.i386_pc
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@ -1,6 +1,7 @@
$(srctree)/out/i386_pc/mop3.iso: $(srctree)/out/kernel.elf
mkdir -p $(srctree)/out/i386_pc/tmp/iso/boot/grub
cp $(srctree)/out/kernel.elf $(srctree)/out/i386_pc/tmp/iso/boot
cp $(srctree)/out/ramdisk.tar $(srctree)/out/i386_pc/tmp/iso/boot
cp $(srctree)/platform/i386_pc/grub.cfg $(srctree)/out/i386_pc/tmp/iso/boot/grub
grub-mkrescue -o $(srctree)/out/i386_pc/mop3.iso $(srctree)/out/i386_pc/tmp/iso