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  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10 #include <common.h>
  11 #include <config.h>
  12 #include <spl.h>
  13 #include <image.h>
  14 #include <linux/compiler.h>
  15
  16 /* Pointer to as well as the global data structure for SPL */
  17 DECLARE_GLOBAL_DATA_PTR;
  18 gd_t gdata __attribute__ ((section(".data")));
  19
  20 /*
  21  * In the context of SPL, board_init_f must ensure that any clocks/etc for
  22  * DDR are enabled, ensure that the stack pointer is valid, clear the BSS
  23  * and call board_init_f.  We provide this version by default but mark it
  24  * as __weak to allow for platforms to do this in their own way if needed.
  25  */
  26 void __weak board_init_f(ulong dummy)
  27 {
  28         /* Set the stack pointer. */
  29         asm volatile("mov sp, %0\n" : : "r"(CONFIG_SPL_STACK));
  30
  31         /* Clear the BSS. */
  32         memset(__bss_start, 0, __bss_end - __bss_start);
  33
  34         /* Set global data pointer. */
  35         gd = &gdata;
  36
  37         board_init_r(NULL, 0);
  38 }
  39
  40 /*
  41  * This function jumps to an image with argument. Normally an FDT or ATAGS
  42  * image.
  43  * arg: Pointer to paramter image in RAM
  44  */
  45 #ifdef CONFIG_SPL_OS_BOOT
  46 void __noreturn jump_to_image_linux(void *arg)
  47 {
  48         debug("Entering kernel arg pointer: 0x%p\n", arg);
  49         typedef void (*image_entry_arg_t)(int, int, void *)
  50                 __attribute__ ((noreturn));
  51         image_entry_arg_t image_entry =
  52                 (image_entry_arg_t) spl_image.entry_point;
  53         cleanup_before_linux();
  54         image_entry(0, CONFIG_MACH_TYPE, arg);
  55 }
  56 #endif