root / hw / arm_boot.c @ 43057ab1
History | View | Annotate | Download (3 kB)
1 | 16406950 | pbrook | /*
|
---|---|---|---|
2 | 16406950 | pbrook | * ARM kernel loader.
|
3 | 16406950 | pbrook | *
|
4 | 16406950 | pbrook | * Copyright (c) 2006 CodeSourcery.
|
5 | 16406950 | pbrook | * Written by Paul Brook
|
6 | 16406950 | pbrook | *
|
7 | 16406950 | pbrook | * This code is licenced under the GPL.
|
8 | 16406950 | pbrook | */
|
9 | 16406950 | pbrook | |
10 | 16406950 | pbrook | #include "vl.h" |
11 | 16406950 | pbrook | |
12 | 16406950 | pbrook | #define KERNEL_ARGS_ADDR 0x100 |
13 | 16406950 | pbrook | #define KERNEL_LOAD_ADDR 0x00010000 |
14 | 16406950 | pbrook | #define INITRD_LOAD_ADDR 0x00800000 |
15 | 16406950 | pbrook | |
16 | 16406950 | pbrook | /* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */
|
17 | 16406950 | pbrook | static uint32_t bootloader[] = {
|
18 | 16406950 | pbrook | 0xe3a00000, /* mov r0, #0 */ |
19 | 16406950 | pbrook | 0xe3a01000, /* mov r1, #0x?? */ |
20 | 16406950 | pbrook | 0xe3811c00, /* orr r1, r1, #0x??00 */ |
21 | 16406950 | pbrook | 0xe59f2000, /* ldr r2, [pc, #0] */ |
22 | 16406950 | pbrook | 0xe59ff000, /* ldr pc, [pc, #0] */ |
23 | 16406950 | pbrook | 0, /* Address of kernel args. Set by integratorcp_init. */ |
24 | 16406950 | pbrook | 0 /* Kernel entry point. Set by integratorcp_init. */ |
25 | 16406950 | pbrook | }; |
26 | 16406950 | pbrook | |
27 | 16406950 | pbrook | static void set_kernel_args(uint32_t ram_size, int initrd_size, |
28 | 16406950 | pbrook | const char *kernel_cmdline) |
29 | 16406950 | pbrook | { |
30 | 16406950 | pbrook | uint32_t *p; |
31 | 16406950 | pbrook | |
32 | 16406950 | pbrook | p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR); |
33 | 16406950 | pbrook | /* ATAG_CORE */
|
34 | 16406950 | pbrook | stl_raw(p++, 5);
|
35 | 16406950 | pbrook | stl_raw(p++, 0x54410001);
|
36 | 16406950 | pbrook | stl_raw(p++, 1);
|
37 | 16406950 | pbrook | stl_raw(p++, 0x1000);
|
38 | 16406950 | pbrook | stl_raw(p++, 0);
|
39 | 16406950 | pbrook | /* ATAG_MEM */
|
40 | 16406950 | pbrook | stl_raw(p++, 4);
|
41 | 16406950 | pbrook | stl_raw(p++, 0x54410002);
|
42 | 16406950 | pbrook | stl_raw(p++, ram_size); |
43 | 16406950 | pbrook | stl_raw(p++, 0);
|
44 | 16406950 | pbrook | if (initrd_size) {
|
45 | 16406950 | pbrook | /* ATAG_INITRD2 */
|
46 | 16406950 | pbrook | stl_raw(p++, 4);
|
47 | 16406950 | pbrook | stl_raw(p++, 0x54420005);
|
48 | 16406950 | pbrook | stl_raw(p++, INITRD_LOAD_ADDR); |
49 | 16406950 | pbrook | stl_raw(p++, initrd_size); |
50 | 16406950 | pbrook | } |
51 | 16406950 | pbrook | if (kernel_cmdline && *kernel_cmdline) {
|
52 | 16406950 | pbrook | /* ATAG_CMDLINE */
|
53 | 16406950 | pbrook | int cmdline_size;
|
54 | 16406950 | pbrook | |
55 | 16406950 | pbrook | cmdline_size = strlen(kernel_cmdline); |
56 | 16406950 | pbrook | memcpy (p + 2, kernel_cmdline, cmdline_size + 1); |
57 | 16406950 | pbrook | cmdline_size = (cmdline_size >> 2) + 1; |
58 | 16406950 | pbrook | stl_raw(p++, cmdline_size + 2);
|
59 | 16406950 | pbrook | stl_raw(p++, 0x54410009);
|
60 | 16406950 | pbrook | p += cmdline_size; |
61 | 16406950 | pbrook | } |
62 | 16406950 | pbrook | /* ATAG_END */
|
63 | 16406950 | pbrook | stl_raw(p++, 0);
|
64 | 16406950 | pbrook | stl_raw(p++, 0);
|
65 | 16406950 | pbrook | } |
66 | 16406950 | pbrook | |
67 | 16406950 | pbrook | void arm_load_kernel(int ram_size, const char *kernel_filename, |
68 | 16406950 | pbrook | const char *kernel_cmdline, const char *initrd_filename, |
69 | 16406950 | pbrook | int board_id)
|
70 | 16406950 | pbrook | { |
71 | 16406950 | pbrook | int kernel_size;
|
72 | 16406950 | pbrook | int initrd_size;
|
73 | 16406950 | pbrook | int n;
|
74 | 16406950 | pbrook | |
75 | 16406950 | pbrook | /* Load the kernel. */
|
76 | 16406950 | pbrook | if (!kernel_filename) {
|
77 | 16406950 | pbrook | fprintf(stderr, "Kernel image must be specified\n");
|
78 | 16406950 | pbrook | exit(1);
|
79 | 16406950 | pbrook | } |
80 | 16406950 | pbrook | kernel_size = load_image(kernel_filename, |
81 | 16406950 | pbrook | phys_ram_base + KERNEL_LOAD_ADDR); |
82 | 16406950 | pbrook | if (kernel_size < 0) { |
83 | 16406950 | pbrook | fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
|
84 | 16406950 | pbrook | exit(1);
|
85 | 16406950 | pbrook | } |
86 | 16406950 | pbrook | if (initrd_filename) {
|
87 | 16406950 | pbrook | initrd_size = load_image(initrd_filename, |
88 | 16406950 | pbrook | phys_ram_base + INITRD_LOAD_ADDR); |
89 | 16406950 | pbrook | if (initrd_size < 0) { |
90 | 16406950 | pbrook | fprintf(stderr, "qemu: could not load initrd '%s'\n",
|
91 | 16406950 | pbrook | initrd_filename); |
92 | 16406950 | pbrook | exit(1);
|
93 | 16406950 | pbrook | } |
94 | 16406950 | pbrook | } else {
|
95 | 16406950 | pbrook | initrd_size = 0;
|
96 | 16406950 | pbrook | } |
97 | 16406950 | pbrook | bootloader[1] |= board_id & 0xff; |
98 | 16406950 | pbrook | bootloader[2] |= (board_id >> 8) & 0xff; |
99 | 16406950 | pbrook | bootloader[5] = KERNEL_ARGS_ADDR;
|
100 | 16406950 | pbrook | bootloader[6] = KERNEL_LOAD_ADDR;
|
101 | 16406950 | pbrook | for (n = 0; n < sizeof(bootloader) / 4; n++) |
102 | 16406950 | pbrook | stl_raw(phys_ram_base + (n * 4), bootloader[n]);
|
103 | 16406950 | pbrook | set_kernel_args(ram_size, initrd_size, kernel_cmdline); |
104 | 16406950 | pbrook | } |