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 #include <asm/mach-types.h>
  16
  17 #ifndef CONFIG_SPL_DM
  18 /* Pointer to as well as the global data structure for SPL */
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 /*
  22  * WARNING: This is going away very soon. Don't use it and don't submit
  23  * pafches that rely on it. The global_data area is set up in crt0.S.
  24  */
  25 gd_t gdata __attribute__ ((section(".data")));
  26 #endif
  27
  28 /*
  29  * In the context of SPL, board_init_f() prepares the hardware for execution
  30  * from system RAM (DRAM, DDR...). As system RAM may not be available yet,
  31  * board_init_f() must use the current GD to store any data which must be
  32  * passed on to later stages. These data include the relocation destination,
  33  * the future stack, and the future GD location. BSS is cleared after this
  34  * function (and therefore must be accessible).
  35  *
  36  * We provide this version by default but mark it as __weak to allow for
  37  * platforms to do this in their own way if needed. Please see the top
  38  * level U-Boot README "Board Initialization Flow" section for info on what
  39  * to put in this function.
  40  */
  41 void __weak board_init_f(ulong dummy)
  42 {
  43 }
  44
  45 /*
  46  * This function jumps to an image with argument. Normally an FDT or ATAGS
  47  * image.
  48  */
  49 #ifdef CONFIG_SPL_OS_BOOT
  50 void __noreturn jump_to_image_linux(struct spl_image_info *spl_image)
  51 {
  52         unsigned long machid = 0xffffffff;
  53 #ifdef CONFIG_MACH_TYPE
  54         machid = CONFIG_MACH_TYPE;
  55 #endif
  56
  57         debug("Entering kernel arg pointer: 0x%p\n", spl_image->arg);
  58         typedef void (*image_entry_arg_t)(int, int, void *)
  59                 __attribute__ ((noreturn));
  60         image_entry_arg_t image_entry =
  61                 (image_entry_arg_t)(uintptr_t) spl_image->entry_point;
  62         cleanup_before_linux();
  63         image_entry(0, machid, spl_image->arg);
  64 }
  65 #endif