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Boot.asm

 
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dan.lewis



Joined: 21 Feb 2007
Posts: 69
Location: Canada

PostPosted: Tue Apr 17, 2007 5:49 pm    Post subject: Boot.asm Reply with quote

Hi guys,

In the spirit of tidy, sexy code, I'd like to contribute the following:
Code:

module BootStrap;

align(4) static struct MultibootHeader {
   uint magic = 0x1BAD_B002;
   uint flags = 0x0000_0003;
   uint checksum = -(magic + flags);
}

void _start() {
   version(D_InlineAsm_X86) asm {
      naked;
      cli;   // disable interrupts
      mov   [$$+0x4000], ESP; // initialize the stack pointer
      push   EBX; // push multiboot information onto the stack
      push   EAX; // push the magic value onto the stack
      call   loadMBI; // load the kernel with the multiboot information
      call   _stop; // program terminator
   }
}

void _stop() {
   version(D_InlineAsm_X86) asm {
      naked;
      hlt; // stop the cpu until an interrupt
      call _stop; // do it again
   }
}

_________________
nop
nop ; problem solved
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