113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
#include <grub/text_fb_info.h>
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#include <stdlib.h>
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#include <tasking.h>
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#include <string.h>
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#include <memory.h>
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#include <grub/multiboot2.h>
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#include <stdint.h>
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#include "../cpu/cpu_init.h"
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#include "../drivers/vga.h"
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#include "elf.h"
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static long initrd_sz;
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static char* initrd;
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typedef int (*func_ptr)();
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static struct multiboot_boot_header_tag* tags;
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static void read_initrd(struct multiboot_boot_header_tag* tags) {
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struct multiboot_tag* tag=(struct multiboot_tag*)(tags+1);
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while (tag->type!=0) {
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switch (tag->type) {
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case MULTIBOOT_TAG_TYPE_MODULE: {
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struct multiboot_tag_module* mod=(struct multiboot_tag_module*) tag;
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initrd=malloc(sizeof(char)*(mod->mod_end-mod->mod_start));
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initrd_sz=mod->mod_end-mod->mod_start;
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memcpy(initrd,(void*)(mod->mod_start+0xC0000000),mod->mod_end-mod->mod_start);
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}
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}
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tag=(struct multiboot_tag*)((char*)tag+((tag->size+7)&0xFFFFFFF8));
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}
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}
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void kmain(struct multiboot_boot_header_tag* hdr) {
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tags=hdr;
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cpu_init(tags);
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text_fb_info info;
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info.address=(char*)0xC00B8000;
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info.width=80;
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info.height=25;
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vga_init(info);
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read_initrd(tags);
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int pos=0;
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uint32_t datapos;
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for (uint32_t i=0;i<1;i++) {
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uint32_t name_size;
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char* name_sz_ptr=(char*)&name_size;
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name_sz_ptr[0]=initrd[pos];
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name_sz_ptr[1]=initrd[pos+1];
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name_sz_ptr[2]=initrd[pos+2];
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name_sz_ptr[3]=initrd[pos+3];
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pos+=4;
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if (name_size==0) {
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break;
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}
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if (strcmp("init",&initrd[pos])==0) {
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pos+=5;
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uint32_t contents_size;
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char* cont_sz_ptr=(char*)&contents_size;
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cont_sz_ptr[0]=initrd[pos];
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cont_sz_ptr[1]=initrd[pos+1];
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cont_sz_ptr[2]=initrd[pos+2];
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cont_sz_ptr[3]=initrd[pos+3];
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pos+=4;
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datapos=pos;
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pos+=contents_size;
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break;
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}
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uint32_t contents_size;
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char* cont_sz_ptr=(char*)&contents_size;
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cont_sz_ptr[0]=initrd[pos];
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cont_sz_ptr[1]=initrd[pos+1];
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cont_sz_ptr[2]=initrd[pos+2];
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cont_sz_ptr[3]=initrd[pos+3];
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pos+=4;
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pos+=contents_size;
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}
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elf_header header;
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pos=datapos;
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char* hdr_ptr=(char*)&header;
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for (size_t i=0;i<sizeof(elf_header);i++) {
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hdr_ptr[i]=initrd[pos];
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pos++;
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}
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if (header.magic!=ELF_MAGIC) {
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vga_write_string("[INFO] Invalid magic number for prog.elf\n");
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} else {
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void* cr3=new_address_space();
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for (int i=0;i<header.pheader_ent_nm;i++) {
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elf_pheader pheader;
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pos=(header.prog_hdr)+(header.pheader_ent_sz*i)+datapos;
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char* phdr_ptr=(char*)&pheader;
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for (size_t i=0;i<sizeof(elf_pheader);i++) {
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phdr_ptr[i]=initrd[pos];
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pos++;
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}
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char* ptr=alloc_memory(((pheader.memsz)/4096)+1);
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memset(ptr,0,pheader.memsz);
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if (pheader.filesz>0) {
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pos=pheader.offset+datapos;
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for (size_t i=0;i<pheader.filesz;i++) {
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ptr[i]=initrd[pos];
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pos++;
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}
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}
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copy_data(cr3,ptr,pheader.memsz,(void*)pheader.vaddr);
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}
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createTaskCr3((void*)header.entry,cr3);
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for(;;) {
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yield();
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}
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}
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}
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