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 #ifndef CONFIG_DM
  17 /* Pointer to as well as the global data structure for SPL */
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 /*
  21  * WARNING: This is going away very soon. Don't use it and don't submit
  22  * pafches that rely on it. The global_data area is set up in crt0.S.
  23  */
  24 gd_t gdata __attribute__ ((section(".data")));
  25 #endif
  26
  27 /*
  28  * In the context of SPL, board_init_f must ensure that any clocks/etc for
  29  * DDR are enabled, ensure that the stack pointer is valid, clear the BSS
  30  * and call board_init_f.  We provide this version by default but mark it
  31  * as __weak to allow for platforms to do this in their own way if needed.
  32  */
  33 void __weak board_init_f(ulong dummy)
  34 {
  35         /* Clear the BSS. */
  36         memset(__bss_start, 0, __bss_end - __bss_start);
  37
  38 #ifndef CONFIG_DM
  39         /* TODO: Remove settings of the global data pointer here */
  40         gd = &gdata;
  41 #endif
  42
  43         board_init_r(NULL, 0);
  44 }
  45
  46 /*
  47  * This function jumps to an image with argument. Normally an FDT or ATAGS
  48  * image.
  49  * arg: Pointer to paramter image in RAM
  50  */
  51 #ifdef CONFIG_SPL_OS_BOOT
  52 void __noreturn jump_to_image_linux(void *arg)
  53 {
  54         unsigned long machid = 0xffffffff;
  55 #ifdef CONFIG_MACH_TYPE
  56         machid = CONFIG_MACH_TYPE;
  57 #endif
  58
  59         debug("Entering kernel arg pointer: 0x%p\n", arg);
  60         typedef void (*image_entry_arg_t)(int, int, void *)
  61                 __attribute__ ((noreturn));
  62         image_entry_arg_t image_entry =
  63                 (image_entry_arg_t) spl_image.entry_point;
  64         cleanup_before_linux();
  65         image_entry(0, machid, arg);
  66 }
  67 #endif