blob: c62cf57d80b25584187c777c09d595d342714b25 [file] [log] [blame]
Daniel Hellstromc2f02da2008-03-28 09:47:00 +01001/* SPARC code for booting linux 2.6
2 *
3 * (C) Copyright 2007
4 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25#include <common.h>
26#include <command.h>
27#include <asm/byteorder.h>
28#include <asm/prom.h>
29#include <asm/cache.h>
Daniel Hellstromaf5eb842008-11-10 12:46:20 +000030#include <image.h>
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010031
32#define PRINT_KERNEL_HEADER
33
34extern image_header_t header;
35extern void srmmu_init_cpu(unsigned int entry);
36extern void prepare_bootargs(char *bootargs);
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010037
38#ifdef CONFIG_USB_UHCI
39extern int usb_lowlevel_stop(void);
40#endif
41
42/* sparc kernel argument (the ROM vector) */
43struct linux_romvec *kernel_arg_promvec;
44
45/* page szie is 4k */
46#define PAGE_SIZE 0x1000
47#define RAMDISK_IMAGE_START_MASK 0x07FF
48#define RAMDISK_PROMPT_FLAG 0x8000
49#define RAMDISK_LOAD_FLAG 0x4000
50struct __attribute__ ((packed)) {
51 char traptable[PAGE_SIZE];
52 char swapper_pg_dir[PAGE_SIZE];
53 char pg0[PAGE_SIZE];
54 char pg1[PAGE_SIZE];
55 char pg2[PAGE_SIZE];
56 char pg3[PAGE_SIZE];
57 char empty_bad_page[PAGE_SIZE];
58 char empty_bad_page_table[PAGE_SIZE];
59 char empty_zero_page[PAGE_SIZE];
60 unsigned char hdr[4]; /* ascii "HdrS" */
61 /* 00.02.06.0b is for Linux kernel 2.6.11 */
62 unsigned char linuxver_mega_major;
63 unsigned char linuxver_major;
64 unsigned char linuxver_minor;
65 unsigned char linuxver_revision;
66 /* header version 0x0203 */
67 unsigned short hdr_ver;
68 union __attribute__ ((packed)) {
69 struct __attribute__ ((packed)) {
70 unsigned short root_flags;
71 unsigned short root_dev;
72 unsigned short ram_flags;
73 unsigned int sparc_ramdisk_image;
74 unsigned int sparc_ramdisk_size;
75 unsigned int reboot_command;
76 unsigned int resv[3];
77 unsigned int end;
78 } ver_0203;
79 } hdr_input;
80} *linux_hdr;
81
82/* temporary initrd image holder */
83image_header_t ihdr;
84
Kumar Gala76da19d2008-10-16 21:52:08 -050085void arch_lmb_reserve(struct lmb *lmb)
86{
87 /* Reserve the space used by PROM and stack. This is done
88 * to avoid that the RAM image is copied over stack or
89 * PROM.
90 */
91 lmb_reserve(lmb, CONFIG_SYS_RELOC_MONITOR_BASE, CONFIG_SYS_RAM_END);
92}
93
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010094/* boot the linux kernel */
Kumar Gala40d7e992008-08-15 08:24:45 -050095int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t * images)
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010096{
97 char *bootargs;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010098 ulong initrd_start, initrd_end;
Kumar Galac4f94192008-08-15 08:24:37 -050099 ulong rd_len;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100100 unsigned int data, len, checksum;
101 unsigned int initrd_addr, kernend;
102 void (*kernel) (struct linux_romvec *, void *);
Kumar Galae906cfa2008-08-15 08:24:40 -0500103 struct lmb *lmb = &images->lmb;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100104 int ret;
105
Kumar Gala49c3a862008-10-21 17:25:45 -0500106 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
107 return 1;
108
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100109 /* Get virtual address of kernel start */
Kumar Gala396f6352008-08-15 08:24:41 -0500110 linux_hdr = (void *)images->os.load;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100111
112 /* */
Kumar Galac160a952008-08-15 08:24:36 -0500113 kernel = (void (*)(struct linux_romvec *, void *))images->ep;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100114
115 /* check for a SPARC kernel */
116 if ((linux_hdr->hdr[0] != 'H') ||
117 (linux_hdr->hdr[1] != 'd') ||
118 (linux_hdr->hdr[2] != 'r') || (linux_hdr->hdr[3] != 'S')) {
119 puts("Error reading header of SPARC Linux kernel, aborting\n");
120 goto error;
121 }
122#ifdef PRINT_KERNEL_HEADER
123 printf("## Found SPARC Linux kernel %d.%d.%d ...\n",
124 linux_hdr->linuxver_major,
125 linux_hdr->linuxver_minor, linux_hdr->linuxver_revision);
126#endif
127
128#ifdef CONFIG_USB_UHCI
129 usb_lowlevel_stop();
130#endif
131
132 /* set basic boot params in kernel header now that it has been
133 * extracted and is writeable.
134 */
135
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100136 /* Calc length of RAM disk, if zero no ramdisk available */
Kumar Galac4f94192008-08-15 08:24:37 -0500137 rd_len = images->rd_end - images->rd_start;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100138
139 if (rd_len) {
Kumar Galac4f94192008-08-15 08:24:37 -0500140 ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100141 &initrd_start, &initrd_end);
142 if (ret) {
143 puts("### Failed to relocate RAM disk\n");
144 goto error;
145 }
146
147 /* Update SPARC kernel header so that Linux knows
148 * what is going on and where to find RAM disk.
149 *
150 * Set INITRD Image address relative to RAM Start
151 */
152 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image =
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200153 initrd_start - CONFIG_SYS_RAM_BASE;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100154 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = rd_len;
155 /* Clear READ ONLY flag if set to non-zero */
156 linux_hdr->hdr_input.ver_0203.root_flags = 1;
157 /* Set root device to: Root_RAM0 */
158 linux_hdr->hdr_input.ver_0203.root_dev = 0x100;
159 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
160 } else {
161 /* NOT using RAMDISK image, overwriting kernel defaults */
162 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = 0;
163 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = 0;
164 /* Leave to kernel defaults
165 linux_hdr->hdr_input.ver_0203.root_flags = 1;
166 linux_hdr->hdr_input.ver_0203.root_dev = 0;
167 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
168 */
169 }
170
171 /* Copy bootargs from bootargs variable to kernel readable area */
172 bootargs = getenv("bootargs");
173 prepare_bootargs(bootargs);
174
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100175 /* turn on mmu & setup context table & page table for process 0 (kernel) */
176 srmmu_init_cpu((unsigned int)kernel);
177
178 /* Enter SPARC Linux kernel
179 * From now on the only code in u-boot that will be
180 * executed is the PROM code.
181 */
Daniel Hellstromaf5eb842008-11-10 12:46:20 +0000182 kernel(kernel_arg_promvec, (void *)images->ep);
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100183
184 /* It will never come to this... */
185 while (1) ;
186
187 error:
Kumar Gala40d7e992008-08-15 08:24:45 -0500188 return 1;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100189}