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(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
  75     /* Load the kernel.  */
  76     if (!kernel_filename) {
  77         fprintf(stderr, "Kernel image must be specified\n");
  78         exit(1);
  79     }
  80     kernel_size = load_image(kernel_filename,
  81                              phys_ram_base + KERNEL_LOAD_ADDR);
  82     if (kernel_size < 0) {
  83         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
  84         exit(1);
  85     }
  86     if (initrd_filename) {
  87         initrd_size = load_image(initrd_filename,
  88                                  phys_ram_base + INITRD_LOAD_ADDR);
  89         if (initrd_size < 0) {
  90             fprintf(stderr, "qemu: could not load initrd '%s'\n",
  91                     initrd_filename);
  92             exit(1);
  93         }
  94     } else {
  95         initrd_size = 0;
  96     }
  97     bootloader[1] |= board_id & 0xff;
  98     bootloader[2] |= (board_id >> 8) & 0xff;
  99     bootloader[5] = KERNEL_ARGS_ADDR;
 100     bootloader[6] = KERNEL_LOAD_ADDR;
 101     for (n = 0; n < sizeof(bootloader) / 4; n++)
 102         stl_raw(phys_ram_base + (n * 4), bootloader[n]);
 103     set_kernel_args(ram_size, initrd_size, kernel_cmdline);
 104 }
 105