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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>
30
31#define PRINT_KERNEL_HEADER
32
33extern image_header_t header;
34extern void srmmu_init_cpu(unsigned int entry);
35extern void prepare_bootargs(char *bootargs);
36extern int do_reset(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]);
37
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
85/* boot the linux kernel */
86void do_bootm_linux(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
87 bootm_headers_t * images)
88{
89 char *bootargs;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010090 ulong initrd_start, initrd_end;
Kumar Galac4f94192008-08-15 08:24:37 -050091 ulong rd_len;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010092 unsigned int data, len, checksum;
93 unsigned int initrd_addr, kernend;
94 void (*kernel) (struct linux_romvec *, void *);
Kumar Galae906cfa2008-08-15 08:24:40 -050095 struct lmb *lmb = &images->lmb;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010096 int ret;
97
Daniel Hellstromc2f02da2008-03-28 09:47:00 +010098 /* Get virtual address of kernel start */
Kumar Gala396f6352008-08-15 08:24:41 -050099 linux_hdr = (void *)images->os.load;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100100
101 /* */
Kumar Galac160a952008-08-15 08:24:36 -0500102 kernel = (void (*)(struct linux_romvec *, void *))images->ep;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100103
104 /* check for a SPARC kernel */
105 if ((linux_hdr->hdr[0] != 'H') ||
106 (linux_hdr->hdr[1] != 'd') ||
107 (linux_hdr->hdr[2] != 'r') || (linux_hdr->hdr[3] != 'S')) {
108 puts("Error reading header of SPARC Linux kernel, aborting\n");
109 goto error;
110 }
111#ifdef PRINT_KERNEL_HEADER
112 printf("## Found SPARC Linux kernel %d.%d.%d ...\n",
113 linux_hdr->linuxver_major,
114 linux_hdr->linuxver_minor, linux_hdr->linuxver_revision);
115#endif
116
117#ifdef CONFIG_USB_UHCI
118 usb_lowlevel_stop();
119#endif
120
121 /* set basic boot params in kernel header now that it has been
122 * extracted and is writeable.
123 */
124
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100125 /* Calc length of RAM disk, if zero no ramdisk available */
Kumar Galac4f94192008-08-15 08:24:37 -0500126 rd_len = images->rd_end - images->rd_start;
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100127
128 if (rd_len) {
129
130 /* Reserve the space used by PROM and stack. This is done
131 * to avoid that the RAM image is copied over stack or
132 * PROM.
133 */
134 lmb_reserve(lmb, CFG_RELOC_MONITOR_BASE, CFG_RAM_END);
135
Kumar Galac4f94192008-08-15 08:24:37 -0500136 ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100137 &initrd_start, &initrd_end);
138 if (ret) {
139 puts("### Failed to relocate RAM disk\n");
140 goto error;
141 }
142
143 /* Update SPARC kernel header so that Linux knows
144 * what is going on and where to find RAM disk.
145 *
146 * Set INITRD Image address relative to RAM Start
147 */
148 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image =
149 initrd_start - CFG_RAM_BASE;
150 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = rd_len;
151 /* Clear READ ONLY flag if set to non-zero */
152 linux_hdr->hdr_input.ver_0203.root_flags = 1;
153 /* Set root device to: Root_RAM0 */
154 linux_hdr->hdr_input.ver_0203.root_dev = 0x100;
155 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
156 } else {
157 /* NOT using RAMDISK image, overwriting kernel defaults */
158 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = 0;
159 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = 0;
160 /* Leave to kernel defaults
161 linux_hdr->hdr_input.ver_0203.root_flags = 1;
162 linux_hdr->hdr_input.ver_0203.root_dev = 0;
163 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
164 */
165 }
166
167 /* Copy bootargs from bootargs variable to kernel readable area */
168 bootargs = getenv("bootargs");
169 prepare_bootargs(bootargs);
170
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100171 /* turn on mmu & setup context table & page table for process 0 (kernel) */
172 srmmu_init_cpu((unsigned int)kernel);
173
174 /* Enter SPARC Linux kernel
175 * From now on the only code in u-boot that will be
176 * executed is the PROM code.
177 */
178 kernel(kernel_arg_promvec, (void *)ep);
179
180 /* It will never come to this... */
181 while (1) ;
182
183 error:
Kumar Gala3216ca92008-08-11 09:20:53 -0500184 do_reset(cmdtp, flag, argc, argv);
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100185 return;
186}