95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
#include <string.h>
|
|
#include "vga.h"
|
|
#include <grub/text_fb_info.h>
|
|
#include <elf.h>
|
|
|
|
typedef struct {
|
|
char filename[100];
|
|
char mode[8];
|
|
char uid[8];
|
|
char gid[8];
|
|
char size[12];
|
|
char mtime[12];
|
|
char chksum[8];
|
|
char typeflag[1];
|
|
} tar_header;
|
|
|
|
uint32_t getsize(const char *in) {
|
|
uint32_t size=0;
|
|
uint32_t j;
|
|
uint32_t count=1;
|
|
for (j=11;j>0;j--,count*=8) {
|
|
size+=((in[j-1]-'0')*count);
|
|
}
|
|
return size;
|
|
}
|
|
|
|
int main(char* initrd, uint32_t initrd_sz) {
|
|
text_fb_info info;
|
|
info.address=map_phys(0xB8000,10);
|
|
info.width=80;
|
|
info.height=25;
|
|
vga_init(info);
|
|
vga_write_string("INIT VGA\n");
|
|
int pos=0;
|
|
uint32_t datapos;
|
|
tar_header tar_hdr;
|
|
for (int i=0;;i++) {
|
|
char* tar_hdr_ptr=(char*)&tar_hdr;
|
|
for (size_t i=0;i<sizeof(tar_hdr);i++) {
|
|
tar_hdr_ptr[i]=initrd[pos+i];
|
|
}
|
|
if (tar_hdr.filename[0]=='\0') break;
|
|
uint32_t size=getsize(tar_hdr.size);
|
|
pos+=512;
|
|
if (strcmp(tar_hdr.filename,"vfs")==0) {
|
|
vga_write_string("VFS found, loading\n");
|
|
datapos=pos;
|
|
break;
|
|
} else {
|
|
vga_write_string("VFS not found\n");
|
|
// for(;;);
|
|
}
|
|
pos+=size;
|
|
if (pos%512!=0) {
|
|
pos+=512-(pos%512);
|
|
}
|
|
}
|
|
elf_header header;
|
|
pos=datapos;
|
|
char* hdr_ptr=(char*)&header;
|
|
for (size_t i=0;i<sizeof(elf_header);i++) {
|
|
hdr_ptr[i]=initrd[pos];
|
|
pos++;
|
|
}
|
|
if (header.magic!=ELF_MAGIC) {
|
|
vga_write_string("[INFO] Invalid magic number for vfs\n");
|
|
} else {
|
|
void* cr3=new_address_space();
|
|
for (int i=0;i<header.pheader_ent_nm;i++) {
|
|
elf_pheader pheader;
|
|
pos=(header.prog_hdr)+(header.pheader_ent_sz*i)+datapos;
|
|
char* phdr_ptr=(char*)&pheader;
|
|
for (size_t i=0;i<sizeof(elf_pheader);i++) {
|
|
phdr_ptr[i]=initrd[pos];
|
|
pos++;
|
|
}
|
|
char* ptr=alloc_memory(((pheader.memsz)/4096)+1);
|
|
memset(ptr,0,pheader.memsz);
|
|
if (pheader.filesz>0) {
|
|
pos=pheader.offset+datapos;
|
|
for (size_t i=0;i<pheader.filesz;i++) {
|
|
ptr[i]=initrd[pos];
|
|
pos++;
|
|
}
|
|
}
|
|
copy_data(cr3,ptr,pheader.memsz,(void*)pheader.vaddr);
|
|
}
|
|
vga_write_string("Loaded VFS into memory, creating task\n");
|
|
createTaskCr3((void*)header.entry,cr3);
|
|
vga_write_string("Creted VFS task, yielding to task\n");
|
|
yield();
|
|
}
|
|
for(;;);
|
|
}
|