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Add: TAR init ramdisk via GRUB2 module

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xamidev
2024-09-05 13:06:54 +02:00
parent 4d05e0d620
commit b59af22897
5 changed files with 27 additions and 6 deletions
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1
src/initrd/hello.txt Normal file
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@@ -0,0 +1 @@
hello, ramdisk world!

21
src/kernel/kmain.c
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@@ -19,6 +19,7 @@ void kmain(multiboot2_info *mb_info)
{
multiboot2_tag_framebuffer *fb_info = NULL;
struct multiboot_tag_mmap *mmap_tag = NULL;
struct multiboot_tag_module *initrd_module = NULL;
uint8_t *tags = mb_info->tags;
while (1) {
@@ -32,6 +33,9 @@ void kmain(multiboot2_info *mb_info)
if (tag_type == MULTIBOOT_TAG_TYPE_MMAP) {
mmap_tag = (struct multiboot_tag_mmap*) tags;
}
if (tag_type == MULTIBOOT_TAG_TYPE_MODULE) {
initrd_module = (struct multiboot_tag_module*) tags;
}
tags += ((tag_size + 7) & ~7);
}
@@ -42,7 +46,7 @@ void kmain(multiboot2_info *mb_info)
serial_printf(3, "Framebuffer Pitch: %u", fb_info->framebuffer_pitch);
serial_printf(3, "Framebuffer BPP: %u", fb_info->framebuffer_bpp);
if (fb_info) {
if (fb_info) { // fb setup
framebuffer = (uint32_t *)(uintptr_t) fb_info->framebuffer_addr;
uint32_t width = fb_info->framebuffer_width;
@@ -60,7 +64,7 @@ void kmain(multiboot2_info *mb_info)
printf("[kernel] framebuffer discovered at 0x%x\n", fb_info->framebuffer_addr);
printf("[kernel] fb0: width=%u, height=%u, pitch=%u, bpp=%u\n", fb_info->framebuffer_width, fb_info->framebuffer_height, fb_info->framebuffer_pitch, fb_info->framebuffer_bpp);
if (mmap_tag)
if (mmap_tag) // memmap debug print
{
printf("[kernel] found memory map tag by multiboot2\n");
struct multiboot_mmap_entry *mmap = mmap_tag->entries;
@@ -84,6 +88,16 @@ void kmain(multiboot2_info *mb_info)
}
}
if (initrd_module) {
uint32_t initrd_start = initrd_module->mod_start;
uint32_t initrd_end = initrd_module->mod_end;
uint32_t initrd_size = initrd_end - initrd_start;
printf("[kernel] TAR initrd module found at 0x%x, size=%u bytes\n", initrd_start, initrd_size);
} else {
puts("[kernel] TAR initrd module not found\n");
}
init_serial();
gdt_install();
idt_install();
@@ -94,7 +108,8 @@ void kmain(multiboot2_info *mb_info)
init_alloc();
void* ptr1 = malloc(256);
void* ptr2 = malloc(512);
free(ptr2);
printf("[debug] malloc test ptr1=0x%x, ptr2=0x%x\n", ptr1, ptr2);
free(ptr1); free(ptr2);
timer_install();
keyboard_install();