lib_blackfin/boot.c

   1 /*
   2  * U-boot - boot.c - misc boot helper functions
   3  *
   4  * Copyright (c) 2005-2008 Analog Devices Inc.
   5  *
   6  * (C) Copyright 2000-2004
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <image.h>
  15 #include <asm/blackfin.h>
  16
  17 #ifdef SHARED_RESOURCES
  18 extern void swap_to(int device_id);
  19 #endif
  20
  21 static char *make_command_line(void)
  22 {
  23         char *dest = (char *)CONFIG_LINUX_CMDLINE_ADDR;
  24         char *bootargs = getenv("bootargs");
  25
  26         if (bootargs == NULL)
  27                 return NULL;
  28
  29         strncpy(dest, bootargs, CONFIG_LINUX_CMDLINE_SIZE);
  30         dest[CONFIG_LINUX_CMDLINE_SIZE - 1] = 0;
  31         return dest;
  32 }
  33
  34 extern ulong bfin_poweron_retx;
  35
  36 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  37 {
  38         int     (*appl) (char *cmdline);
  39         char    *cmdline;
  40
  41         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  42                 return 1;
  43
  44 #ifdef SHARED_RESOURCES
  45         swap_to(FLASH);
  46 #endif
  47
  48         appl = (int (*)(char *))images->ep;
  49
  50         printf("Starting Kernel at = %p\n", appl);
  51         cmdline = make_command_line();
  52         icache_disable();
  53         dcache_disable();
  54         asm __volatile__(
  55                 "RETX = %[retx];"
  56                 "CALL (%0);"
  57                 :
  58                 : "p"(appl), "q0"(cmdline), [retx] "d"(bfin_poweron_retx)
  59         );
  60         /* does not return */
  61
  62         return 1;
  63 }