xref: /openbmc/u-boot/arch/arm/lib/spl.c (revision f6877372)
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
66