hw/arm_boot.c

   1 /*
   2  * ARM kernel loader.
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the GPL.
   8  */
   9
  10 #include "vl.h"
  11
  12 #define KERNEL_ARGS_ADDR 0x100
  13 #define KERNEL_LOAD_ADDR 0x00010000
  14 #define INITRD_LOAD_ADDR 0x00800000
  15
  16 /* The worlds second smallest bootloader.  Set r0-r2, then jump to kernel.  */
  17 static uint32_t bootloader[] = {
  18   0xe3a00000, /* mov     r0, #0 */
  19   0xe3a01000, /* mov     r1, #0x?? */
  20   0xe3811c00, /* orr     r1, r1, #0x??00 */
  21   0xe59f2000, /* ldr     r2, [pc, #0] */
  22   0xe59ff000, /* ldr     pc, [pc, #0] */
  23   0, /* Address of kernel args.  Set by integratorcp_init.  */
  24   0  /* Kernel entry point.  Set by integratorcp_init.  */
  25 };
  26
  27 static void set_kernel_args(uint32_t ram_size, int initrd_size,
  28                             const char *kernel_cmdline)
  29 {
  30     uint32_t *p;
  31
  32     p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR);
  33     /* ATAG_CORE */
  34     stl_raw(p++, 5);
  35     stl_raw(p++, 0x54410001);
  36     stl_raw(p++, 1);
  37     stl_raw(p++, 0x1000);
  38     stl_raw(p++, 0);
  39     /* ATAG_MEM */
  40     stl_raw(p++, 4);
  41     stl_raw(p++, 0x54410002);
  42     stl_raw(p++, ram_size);
  43     stl_raw(p++, 0);
  44     if (initrd_size) {
  45         /* ATAG_INITRD2 */
  46         stl_raw(p++, 4);
  47         stl_raw(p++, 0x54420005);
  48         stl_raw(p++, INITRD_LOAD_ADDR);
  49         stl_raw(p++, initrd_size);
  50     }
  51     if (kernel_cmdline && *kernel_cmdline) {
  52         /* ATAG_CMDLINE */
  53         int cmdline_size;
  54
  55         cmdline_size = strlen(kernel_cmdline);
  56         memcpy (p + 2, kernel_cmdline, cmdline_size + 1);
  57         cmdline_size = (cmdline_size >> 2) + 1;
  58         stl_raw(p++, cmdline_size + 2);
  59         stl_raw(p++, 0x54410009);
  60         p += cmdline_size;
  61     }
  62     /* ATAG_END */
  63     stl_raw(p++, 0);
  64     stl_raw(p++, 0);
  65 }
  66
  67 void arm_load_kernel(CPUState *env, int ram_size, const char *kernel_filename,
  68                      const char *kernel_cmdline, const char *initrd_filename,
  69                      int board_id)
  70 {
  71     int kernel_size;
  72     int initrd_size;
  73     int n;
  74     uint64_t entry;
  75
  76     /* Load the kernel.  */
  77     if (!kernel_filename) {
  78         fprintf(stderr, "Kernel image must be specified\n");
  79         exit(1);
  80     }
  81
  82     kernel_size = load_elf(kernel_filename, 0, &entry);
  83     if (kernel_size >= 0) {
  84         /* An ELF image.  Jump to the entry point.  */
  85         env->regs[15] = entry & 0xfffffffe;
  86         env->thumb = entry & 1;
  87     } else {
  88         /* Raw binary image. Assume it is a Linux zImage.  */
  89         kernel_size = load_image(kernel_filename,
  90                                  phys_ram_base + KERNEL_LOAD_ADDR);
  91         if (kernel_size < 0) {
  92             fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
  93             exit(1);
  94         }
  95         if (initrd_filename) {
  96             initrd_size = load_image(initrd_filename,
  97                                      phys_ram_base + INITRD_LOAD_ADDR);
  98             if (initrd_size < 0) {
  99                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 100                         initrd_filename);
 101                 exit(1);
 102             }
 103         } else {
 104             initrd_size = 0;
 105         }
 106         bootloader[1] |= board_id & 0xff;
 107         bootloader[2] |= (board_id >> 8) & 0xff;
 108         bootloader[5] = KERNEL_ARGS_ADDR;
 109         bootloader[6] = KERNEL_LOAD_ADDR;
 110         for (n = 0; n < sizeof(bootloader) / 4; n++)
 111             stl_raw(phys_ram_base + (n * 4), bootloader[n]);
 112         set_kernel_args(ram_size, initrd_size, kernel_cmdline);
 113     }
 114 }
 115