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 main_cpu_reset(void *opaque)
  28 {
  29     CPUState *env = opaque;
  30
  31     cpu_reset(env);
  32     if (env->kernel_filename)
  33         arm_load_kernel(env, env->ram_size, env->kernel_filename,
  34                         env->kernel_cmdline, env->initrd_filename,
  35                         env->board_id);
  36 }
  37
  38 static void set_kernel_args(uint32_t ram_size, int initrd_size,
  39                             const char *kernel_cmdline)
  40 {
  41     uint32_t *p;
  42
  43     p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR);
  44     /* ATAG_CORE */
  45     stl_raw(p++, 5);
  46     stl_raw(p++, 0x54410001);
  47     stl_raw(p++, 1);
  48     stl_raw(p++, 0x1000);
  49     stl_raw(p++, 0);
  50     /* ATAG_MEM */
  51     stl_raw(p++, 4);
  52     stl_raw(p++, 0x54410002);
  53     stl_raw(p++, ram_size);
  54     stl_raw(p++, 0);
  55     if (initrd_size) {
  56         /* ATAG_INITRD2 */
  57         stl_raw(p++, 4);
  58         stl_raw(p++, 0x54420005);
  59         stl_raw(p++, INITRD_LOAD_ADDR);
  60         stl_raw(p++, initrd_size);
  61     }
  62     if (kernel_cmdline && *kernel_cmdline) {
  63         /* ATAG_CMDLINE */
  64         int cmdline_size;
  65
  66         cmdline_size = strlen(kernel_cmdline);
  67         memcpy (p + 2, kernel_cmdline, cmdline_size + 1);
  68         cmdline_size = (cmdline_size >> 2) + 1;
  69         stl_raw(p++, cmdline_size + 2);
  70         stl_raw(p++, 0x54410009);
  71         p += cmdline_size;
  72     }
  73     /* ATAG_END */
  74     stl_raw(p++, 0);
  75     stl_raw(p++, 0);
  76 }
  77
  78 void arm_load_kernel(CPUState *env, int ram_size, const char *kernel_filename,
  79                      const char *kernel_cmdline, const char *initrd_filename,
  80                      int board_id)
  81 {
  82     int kernel_size;
  83     int initrd_size;
  84     int n;
  85     int is_linux = 0;
  86     uint64_t elf_entry;
  87     target_ulong entry;
  88
  89     /* Load the kernel.  */
  90     if (!kernel_filename) {
  91         fprintf(stderr, "Kernel image must be specified\n");
  92         exit(1);
  93     }
  94
  95     if (!env->kernel_filename) {
  96         env->ram_size = ram_size;
  97         env->kernel_filename = kernel_filename;
  98         env->kernel_cmdline = kernel_cmdline;
  99         env->initrd_filename = initrd_filename;
 100         env->board_id = board_id;
 101         qemu_register_reset(main_cpu_reset, env);
 102     }
 103     /* Assume that raw images are linux kernels, and ELF images are not.  */
 104     kernel_size = load_elf(kernel_filename, 0, &elf_entry);
 105     entry = elf_entry;
 106     if (kernel_size < 0) {
 107         kernel_size = load_uboot(kernel_filename, &entry, &is_linux);
 108     }
 109     if (kernel_size < 0) {
 110         kernel_size = load_image(kernel_filename,
 111                                  phys_ram_base + KERNEL_LOAD_ADDR);
 112         entry = KERNEL_LOAD_ADDR;
 113         is_linux = 1;
 114     }
 115     if (kernel_size < 0) {
 116         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 117         exit(1);
 118     }
 119     if (!is_linux) {
 120         /* Jump to the entry point.  */
 121         env->regs[15] = entry & 0xfffffffe;
 122         env->thumb = entry & 1;
 123     } else {
 124         if (initrd_filename) {
 125             initrd_size = load_image(initrd_filename,
 126                                      phys_ram_base + INITRD_LOAD_ADDR);
 127             if (initrd_size < 0) {
 128                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 129                         initrd_filename);
 130                 exit(1);
 131             }
 132         } else {
 133             initrd_size = 0;
 134         }
 135         bootloader[1] |= board_id & 0xff;
 136         bootloader[2] |= (board_id >> 8) & 0xff;
 137         bootloader[5] = KERNEL_ARGS_ADDR;
 138         bootloader[6] = entry;
 139         for (n = 0; n < sizeof(bootloader) / 4; n++)
 140             stl_raw(phys_ram_base + (n * 4), bootloader[n]);
 141         set_kernel_args(ram_size, initrd_size, kernel_cmdline);
 142     }
 143 }
 144