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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;
90 ulong ep, load;
91 ulong initrd_start, initrd_end;
92 ulong rd_data_start, rd_data_end, rd_len;
93 unsigned int data, len, checksum;
94 unsigned int initrd_addr, kernend;
95 void (*kernel) (struct linux_romvec *, void *);
96 struct lmb *lmb = images->lmb;
97 int ret;
98
99 if (images->legacy_hdr_valid) {
100 ep = image_get_ep(images->legacy_hdr_os);
101 load = image_get_load(images->legacy_hdr_os);
102#if defined(CONFIG_FIT)
103 } else if (images->fit_uname_os) {
104 int ret = fit_image_get_entry(images->fit_hdr_os,
105 images->fit_noffset_os, &ep);
106 if (ret) {
107 puts("Can't get entry point property!\n");
108 goto error;
109 }
110
111 ret = fit_image_get_load(images->fit_hdr_os,
112 images->fit_noffset_os, &load);
113 if (ret) {
114 puts("Can't get load address property!\n");
115 goto error;
116 }
117#endif
118 } else {
119 puts("Could not find kernel entry point!\n");
120 goto error;
121 }
122
123 /* Get virtual address of kernel start */
124 linux_hdr = (void *)load;
125
126 /* */
127 kernel = (void (*)(struct linux_romvec *, void *))ep;
128
129 /* check for a SPARC kernel */
130 if ((linux_hdr->hdr[0] != 'H') ||
131 (linux_hdr->hdr[1] != 'd') ||
132 (linux_hdr->hdr[2] != 'r') || (linux_hdr->hdr[3] != 'S')) {
133 puts("Error reading header of SPARC Linux kernel, aborting\n");
134 goto error;
135 }
136#ifdef PRINT_KERNEL_HEADER
137 printf("## Found SPARC Linux kernel %d.%d.%d ...\n",
138 linux_hdr->linuxver_major,
139 linux_hdr->linuxver_minor, linux_hdr->linuxver_revision);
140#endif
141
142#ifdef CONFIG_USB_UHCI
143 usb_lowlevel_stop();
144#endif
145
146 /* set basic boot params in kernel header now that it has been
147 * extracted and is writeable.
148 */
149
150 /*
151 * Are we going to use an initrd image?
152 */
153 ret = boot_get_ramdisk(argc, argv, images, IH_ARCH_SPARC,
154 &rd_data_start, &rd_data_end);
155 if (ret) {
156 /* RAM disk found but was corrupt */
157 puts("RAM Disk corrupt\n");
158 goto error;
159 }
160
161 /* Calc length of RAM disk, if zero no ramdisk available */
162 rd_len = rd_data_end - rd_data_start;
163
164 if (rd_len) {
165
166 /* Reserve the space used by PROM and stack. This is done
167 * to avoid that the RAM image is copied over stack or
168 * PROM.
169 */
170 lmb_reserve(lmb, CFG_RELOC_MONITOR_BASE, CFG_RAM_END);
171
172 ret = boot_ramdisk_high(lmb, rd_data_start, rd_len,
173 &initrd_start, &initrd_end);
174 if (ret) {
175 puts("### Failed to relocate RAM disk\n");
176 goto error;
177 }
178
179 /* Update SPARC kernel header so that Linux knows
180 * what is going on and where to find RAM disk.
181 *
182 * Set INITRD Image address relative to RAM Start
183 */
184 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image =
185 initrd_start - CFG_RAM_BASE;
186 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = rd_len;
187 /* Clear READ ONLY flag if set to non-zero */
188 linux_hdr->hdr_input.ver_0203.root_flags = 1;
189 /* Set root device to: Root_RAM0 */
190 linux_hdr->hdr_input.ver_0203.root_dev = 0x100;
191 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
192 } else {
193 /* NOT using RAMDISK image, overwriting kernel defaults */
194 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = 0;
195 linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = 0;
196 /* Leave to kernel defaults
197 linux_hdr->hdr_input.ver_0203.root_flags = 1;
198 linux_hdr->hdr_input.ver_0203.root_dev = 0;
199 linux_hdr->hdr_input.ver_0203.ram_flags = 0;
200 */
201 }
202
203 /* Copy bootargs from bootargs variable to kernel readable area */
204 bootargs = getenv("bootargs");
205 prepare_bootargs(bootargs);
206
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100207 /* turn on mmu & setup context table & page table for process 0 (kernel) */
208 srmmu_init_cpu((unsigned int)kernel);
209
210 /* Enter SPARC Linux kernel
211 * From now on the only code in u-boot that will be
212 * executed is the PROM code.
213 */
214 kernel(kernel_arg_promvec, (void *)ep);
215
216 /* It will never come to this... */
217 while (1) ;
218
219 error:
Kumar Gala3216ca92008-08-11 09:20:53 -0500220 do_reset(cmdtp, flag, argc, argv);
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100221 return;
222}