initrd stub

Makefile

@@ -2,7 +2,7 @@ CC=x86_64-elf-gcc
 TARGET=x86_64
 SRCDIR=$(PWD)/src/
 OBJDIR=$(PWD)/bin/
-ISO=$(PWD)/boot/$(TARGET)/iso/
+ISO=$(PWD)/boot/$(TARGET)/iso
 KERNEL=$(ISO)/kernel
 INITRD=$(ISO)/initrd
 rwildcard=$(foreach d,$(wildcard $(1:=/*)),$(call rwildcard,$d,$2) $(filter $(subst *,%,$2),$d))
@@ -29,9 +29,9 @@ $(KERNEL): srcdir $(KERNELSRCDEPS) kernel.ld
 	$(CC) $(LDFLAGS) -o $@ $(call rwildcard,bin,*.o)
 
 $(INITRD): $(call rwildcard,initrd,*)
-	cd initrd;tar -cf $(INITRD) .
+	cd initrd;tar -cf $(INITRD) *
 
-sysdisk.iso: $(ISO)
+sysdisk.iso: $(ISO) $(INITRD)
 	cp liminebg.bmp limine.cfg limine/limine.sys limine/limine-cd.bin limine/limine-cd-efi.bin $(ISO)
 	xorriso -as mkisofs -b limine-cd.bin -no-emul-boot -boot-load-size 4 -boot-info-table --efi-boot limine-cd-efi.bin -efi-boot-part --efi-boot-image --protective-msdos-label $(ISO) -o sysdisk.iso
 	

initrd/etc/test

@@ -0,0 +1 @@
+this is just a test

src/arch/x86_64/main.c

@@ -54,6 +54,8 @@ void kmain(){
 
 	if(vfs_mount(vfs_root(), NULL, "", "tmpfs", 0, NULL))
 		_panic("Failed to mount tmpfs", 0);
+	
+	initrd_parse();
 
 	_panic("End of kmain()", 0);
 

src/fs/initrd.c

@@ -0,0 +1,147 @@
+#include <kernel/initrd.h>
+#include <kernel/vfs.h>
+#include <arch/panic.h>
+#include <limine.h>
+#include <string.h>
+#include <stdio.h>
+
+#define TAR_BLOCKSIZE 512
+
+static volatile struct limine_module_request modreq = {
+	.id = LIMINE_MODULE_REQUEST,
+	.revision = 0
+};
+
+typedef struct{
+	char name[100];
+	char mode[8];
+	char uid[8];
+	char gid[8];
+	char size[12];
+	char modtime[12];
+	char checksum[8];
+	char type[1];
+	char link[100];
+	char indicator[6];
+	char version[2];
+	char uname[32];
+	char gname[32];
+	char devmajor[8];
+	char devminor[8];
+	char prefix[155];
+} tar_block;
+
+typedef struct{
+	char name[256];
+	short mode;
+	short gid;
+	short uid;
+	size_t size;
+	size_t modtime;
+	short  checksum;
+	short  type;
+	char link[101];
+	char indicator[6];
+	char version[2];
+	short devminor;
+	short devmajor;
+} tar_entry;
+
+static volatile size_t convert(char* buff, size_t len){
+	size_t result = 0;
+	while(len--){
+		result *= 8;
+		result += *buff - '0';
+		buff++;
+	}
+	
+	return result;
+}
+
+static volatile void buildentry(tar_entry* entry, void* addr){
+	
+	tar_block* block = (tar_block*)addr;
+
+	if(block->name[99]){
+		if(block->prefix[154]){
+			memcpy(entry->name, block->prefix, 154);
+		}
+		else{
+			strcpy(entry->name, block->prefix);
+		}
+		
+		memcpy(entry->name + strlen(entry->name), block->name, 99);
+
+	}
+	else{
+		
+		strcpy(entry->name, block->name);
+
+	}
+	
+	entry->mode = convert(block->mode, 8);
+	entry->uid = convert(block->uid, 8);
+	entry->gid = convert(block->gid, 8);
+	entry->size = convert(block->size, 11);
+	entry->modtime = convert(block->modtime, 11);
+	entry->checksum = convert(block->checksum, 8);
+	entry->type = convert(block->type, 1);
+	
+	if(block->link[99]){
+		memcpy(entry->link, block->link, 100);
+	}
+	else{
+		strcpy(entry->link, block->link);
+	}
+	
+	memcpy(entry->indicator, block->indicator, 6);
+	memcpy(entry->version, block->version, 2);
+	entry->devmajor = convert(block->devmajor, 8);
+	entry->devminor = convert(block->devminor, 8);
+
+	
+	
+}
+
+void initrd_parse(){
+	
+	if(!modreq.response)
+		_panic("No modules passed to limine!", 0);
+	
+	size_t modcount = modreq.response->module_count;
+	struct limine_file** modules = modreq.response->modules;
+	struct limine_file* initrd = NULL;
+
+	for(size_t i = 0; i < modcount; ++i){	
+		if(!strcmp(modules[i]->path, "/initrd")){
+			initrd = modules[i];
+			break;
+		}
+	}
+
+	if(!initrd) _panic("No initrd found!", 0);
+
+	printf("Found initrd at %p with size %lu\n", initrd->address, initrd->size);
+	
+	void* addr = initrd->address;
+	
+	tar_entry entry;
+
+	memset(entry.name, 0, 256);
+	memset(entry.link, 0, 101);
+
+	for(;;){
+
+		buildentry(&entry, addr);	
+
+
+		if(strncmp("ustar", entry.indicator, 5))
+			break;
+
+		printf("NAME: %s SIZE: %lu\n", entry.name, entry.size);
+		
+		addr += TAR_BLOCKSIZE + TAR_BLOCKSIZE * (entry.size / TAR_BLOCKSIZE) + (entry.size % TAR_BLOCKSIZE > 0 ? TAR_BLOCKSIZE : 0);
+
+	}
+
+}

src/include/kernel/initrd.h

@@ -0,0 +1,6 @@
+#ifndef _INITRD_H_INCLUDE
+#define _INITRD_H_INCLUDE
+
+void initrd_parse();
+
+#endif