arch/x86/boot.c

   1 /* tag: openbios boot command for x86
   2  *
   3  * Copyright (C) 2003-2004 Stefan Reinauer
   4  *
   5  * See the file "COPYING" for further information about
   6  * the copyright and warranty status of this work.
   7  */
   8
   9 #undef BOOTSTRAP
  10 #include "config.h"
  11 #include "libopenbios/bindings.h"
  12 #include "arch/common/nvram.h"
  13 #include "libc/diskio.h"
  14 #include "libopenbios/sys_info.h"
  15 #include "boot.h"
  16
  17 void go(void)
  18 {
  19         ucell address, type, size;
  20         int image_retval = 0;
  21
  22         /* Get the entry point and the type (see forth/debugging/client.fs) */
  23         feval("saved-program-state >sps.entry @");
  24         address = POP();
  25         feval("saved-program-state >sps.file-type @");
  26         type = POP();
  27         feval("saved-program-state >sps.file-size @");
  28         size = POP();
  29
  30         printk("\nJumping to entry point " FMT_ucellx " for type " FMT_ucellx "...\n", address, type);
  31
  32         switch (type) {
  33                 case 0x0:
  34                         /* Start ELF boot image */
  35                         image_retval = start_elf(address, (uint32_t)&elf_boot_notes);
  36                         break;
  37
  38                 case 0x1:
  39                         /* Start ELF image */
  40                         image_retval = start_elf(address, (uint32_t)NULL);
  41                         break;
  42
  43                 case 0x5:
  44                         /* Start a.out image */
  45                         image_retval = start_elf(address, (uint32_t)NULL);
  46                         break;
  47
  48                 case 0x10:
  49                         /* Start Fcode image */
  50                         printk("Evaluating FCode...\n");
  51                         PUSH(address);
  52                         PUSH(1);
  53                         fword("byte-load");
  54                         image_retval = 0;
  55                         break;
  56
  57                 case 0x11:
  58                         /* Start Forth image */
  59                         PUSH(address);
  60                         PUSH(size);
  61                         fword("eval2");
  62                         image_retval = 0;
  63                         break;
  64         }
  65
  66         printk("Image returned with return value %#x\n", image_retval);
  67 }
  68
  69
  70 void boot(void)
  71 {
  72         /* No platform-specific boot code */
  73         return;
  74 }