arch/arm/lib/spl.c

   1 /*
   2  * (C) Copyright 2010-2012
   3  * Texas Instruments, <www.ti.com>
   4  *
   5  * Aneesh V <aneesh@ti.com>
   6  * Tom Rini <trini@ti.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26 #include <common.h>
  27 #include <config.h>
  28 #include <spl.h>
  29 #include <image.h>
  30 #include <linux/compiler.h>
  31
  32 /* Pointer to as well as the global data structure for SPL */
  33 DECLARE_GLOBAL_DATA_PTR;
  34 gd_t gdata __attribute__ ((section(".data")));
  35
  36 /*
  37  * In the context of SPL, board_init_f must ensure that any clocks/etc for
  38  * DDR are enabled, ensure that the stack pointer is valid, clear the BSS
  39  * and call board_init_f.  We provide this version by default but mark it
  40  * as __weak to allow for platforms to do this in their own way if needed.
  41  */
  42 void __weak board_init_f(ulong dummy)
  43 {
  44         /* Set the stack pointer. */
  45         asm volatile("mov sp, %0\n" : : "r"(CONFIG_SPL_STACK));
  46
  47         /* Clear the BSS. */
  48         memset(__bss_start, 0, __bss_end - __bss_start);
  49
  50         /* Set global data pointer. */
  51         gd = &gdata;
  52
  53         board_init_r(NULL, 0);
  54 }
  55
  56 /*
  57  * This function jumps to an image with argument. Normally an FDT or ATAGS
  58  * image.
  59  * arg: Pointer to paramter image in RAM
  60  */
  61 #ifdef CONFIG_SPL_OS_BOOT
  62 void __noreturn jump_to_image_linux(void *arg)
  63 {
  64         debug("Entering kernel arg pointer: 0x%p\n", arg);
  65         typedef void (*image_entry_arg_t)(int, int, void *)
  66                 __attribute__ ((noreturn));
  67         image_entry_arg_t image_entry =
  68                 (image_entry_arg_t) spl_image.entry_point;
  69         cleanup_before_linux();
  70         image_entry(0, CONFIG_MACH_TYPE, arg);
  71 }
  72 #endif