108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
#include <string.h>
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#include "vga.h"
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#include <grub/text_fb_info.h>
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#include <elf.h>
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typedef struct {
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char filename[100];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char typeflag[1];
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} tar_header;
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uint32_t getsize(const char *in) {
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uint32_t size=0;
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uint32_t j;
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uint32_t count=1;
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for (j=11;j>0;j--,count*=8) {
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size+=((in[j-1]-'0')*count);
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}
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return size;
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}
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int main(char* initrd, uint32_t initrd_sz) {
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text_fb_info info;
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info.address=map_phys(0xB8000,10);
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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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vga_write_string("INIT VGA\n");
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int pos=0;
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uint32_t datapos;
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tar_header tar_hdr;
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for (int i=0;;i++) {
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char* tar_hdr_ptr=(char*)&tar_hdr;
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for (size_t i=0;i<sizeof(tar_hdr);i++) {
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tar_hdr_ptr[i]=initrd[pos+i];
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}
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if (tar_hdr.filename[0]=='\0') break;
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uint32_t size=getsize(tar_hdr.size);
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pos+=512;
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if (strcmp(tar_hdr.filename,"vfs")==0) {
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vga_write_string("VFS found, loading\n");
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datapos=pos;
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break;
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} else {
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vga_write_string("VFS not found\n");
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// for(;;);
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}
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pos+=size;
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if (pos%512!=0) {
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pos+=512-(pos%512);
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}
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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 vfs\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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vga_write_string("Loaded VFS into memory, creating task\n");
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createTaskCr3((void*)header.entry,cr3);
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vga_write_string("Created VFS task, sending test message\n");
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send_msg(2,"hello",6);
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vga_write_string("Sent test message, yielding to task\n");
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yield();
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vga_write_string("Yielded and got control, getting message\n");
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int sender;
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int size;
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char* msg=get_msg(&sender,&size);
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vga_write_string("Message of size ");
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char str[256];
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int_to_ascii(size,str);
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vga_write_string(str);
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vga_write_string(": ");
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vga_write_string(msg);
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vga_write_string("\n");
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}
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for(;;);
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}
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