arch/sparc/lib/bootm.c

   1 /* 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 #include <image.h>
  31
  32 #define PRINT_KERNEL_HEADER
  33
  34 extern image_header_t header;
  35 extern void srmmu_init_cpu(unsigned int entry);
  36 extern void prepare_bootargs(char *bootargs);
  37
  38 #ifdef CONFIG_USB_UHCI
  39 extern int usb_lowlevel_stop(void);
  40 #endif
  41
  42 /* sparc kernel argument (the ROM vector) */
  43 struct 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
  50 struct __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 */
  83 image_header_t ihdr;
  84
  85 void 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
  94 /* boot the linux kernel */
  95 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t * images)
  96 {
  97         char *bootargs;
  98         ulong initrd_start, initrd_end;
  99         ulong rd_len;
 100         unsigned int data, len, checksum;
 101         unsigned int initrd_addr, kernend;
 102         void (*kernel) (struct linux_romvec *, void *);
 103         struct lmb *lmb = &images->lmb;
 104         int ret;
 105
 106         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
 107                 return 1;
 108
 109         /* Get virtual address of kernel start */
 110         linux_hdr = (void *)images->os.load;
 111
 112         /* */
 113         kernel = (void (*)(struct linux_romvec *, void *))images->ep;
 114
 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
 136         /* Calc length of RAM disk, if zero no ramdisk available */
 137         rd_len = images->rd_end - images->rd_start;
 138
 139         if (rd_len) {
 140                 ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
 141                                         &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 =
 153                     initrd_start - CONFIG_SYS_RAM_BASE;
 154                 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
 175         /* 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          */
 182         kernel(kernel_arg_promvec, (void *)images->ep);
 183
 184         /* It will never come to this... */
 185         while (1) ;
 186
 187       error:
 188         return 1;
 189 }