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af6bbd4d SG |
1 | /* |
2 | * Code shared between SPL and U-Boot proper | |
3 | * | |
4 | * Copyright (c) 2015 Google, Inc | |
5 | * Written by Simon Glass <sjg@chromium.org> | |
6 | * | |
7 | * SPDX-License-Identifier: GPL-2.0+ | |
8 | */ | |
9 | ||
10 | #include <common.h> | |
11 | ||
12 | DECLARE_GLOBAL_DATA_PTR; | |
13 | ||
adc421e4 AA |
14 | /* Unfortunately x86 or ARM can't compile this code as gd cannot be assigned */ |
15 | #if !defined(CONFIG_X86) && !defined(CONFIG_ARM) | |
af6bbd4d SG |
16 | __weak void arch_setup_gd(struct global_data *gd_ptr) |
17 | { | |
18 | gd = gd_ptr; | |
19 | } | |
adc421e4 | 20 | #endif /* !CONFIG_X86 && !CONFIG_ARM */ |
af6bbd4d | 21 | |
ecc30663 AA |
22 | /* |
23 | * Allocate reserved space for use as 'globals' from 'top' address and | |
24 | * return 'bottom' address of allocated space | |
25 | * | |
26 | * Notes: | |
27 | * | |
28 | * Actual reservation cannot be done from within this function as | |
29 | * it requires altering the C stack pointer, so this will be done by | |
30 | * the caller upon return from this function. | |
31 | * | |
32 | * IMPORTANT: | |
33 | * | |
34 | * Alignment constraints may differ for each 'chunk' allocated. For now: | |
35 | * | |
36 | * - GD is aligned down on a 16-byte boundary | |
37 | * | |
38 | * - the early malloc arena is not aligned, therefore it follows the stack | |
39 | * alignment constraint of the architecture for which we are bulding. | |
40 | * | |
41 | * - GD is allocated last, so that the return value of this functions is | |
42 | * both the bottom of the reserved area and the address of GD, should | |
43 | * the calling context need it. | |
44 | */ | |
45 | ||
46 | ulong board_init_f_alloc_reserve(ulong top) | |
47 | { | |
48 | /* Reserve early malloc arena */ | |
f1896c45 AY |
49 | #if CONFIG_VAL(SYS_MALLOC_F_LEN) |
50 | top -= CONFIG_VAL(SYS_MALLOC_F_LEN); | |
ecc30663 AA |
51 | #endif |
52 | /* LAST : reserve GD (rounded up to a multiple of 16 bytes) */ | |
53 | top = rounddown(top-sizeof(struct global_data), 16); | |
54 | ||
55 | return top; | |
56 | } | |
57 | ||
58 | /* | |
59 | * Initialize reserved space (which has been safely allocated on the C | |
60 | * stack from the C runtime environment handling code). | |
61 | * | |
62 | * Notes: | |
63 | * | |
64 | * Actual reservation was done by the caller; the locations from base | |
65 | * to base+size-1 (where 'size' is the value returned by the allocation | |
66 | * function above) can be accessed freely without risk of corrupting the | |
67 | * C runtime environment. | |
68 | * | |
69 | * IMPORTANT: | |
70 | * | |
71 | * Upon return from the allocation function above, on some architectures | |
72 | * the caller will set gd to the lowest reserved location. Therefore, in | |
73 | * this initialization function, the global data MUST be placed at base. | |
74 | * | |
75 | * ALSO IMPORTANT: | |
76 | * | |
77 | * On some architectures, gd will already be good when entering this | |
78 | * function. On others, it will only be good once arch_setup_gd() returns. | |
79 | * Therefore, global data accesses must be done: | |
80 | * | |
81 | * - through gd_ptr if before the call to arch_setup_gd(); | |
82 | * | |
83 | * - through gd once arch_setup_gd() has been called. | |
84 | * | |
85 | * Do not use 'gd->' until arch_setup_gd() has been called! | |
86 | * | |
87 | * IMPORTANT TOO: | |
88 | * | |
89 | * Initialization for each "chunk" (GD, early malloc arena...) ends with | |
90 | * an incrementation line of the form 'base += <some size>'. The last of | |
91 | * these incrementations seems useless, as base will not be used any | |
92 | * more after this incrementation; but if/when a new "chunk" is appended, | |
93 | * this increment will be essential as it will give base right value for | |
94 | * this new chunk (which will have to end with its own incrementation | |
95 | * statement). Besides, the compiler's optimizer will silently detect | |
96 | * and remove the last base incrementation, therefore leaving that last | |
97 | * (seemingly useless) incrementation causes no code increase. | |
98 | */ | |
99 | ||
100 | void board_init_f_init_reserve(ulong base) | |
af6bbd4d SG |
101 | { |
102 | struct global_data *gd_ptr; | |
103 | ||
ecc30663 AA |
104 | /* |
105 | * clear GD entirely and set it up. | |
106 | * Use gd_ptr, as gd may not be properly set yet. | |
107 | */ | |
af6bbd4d | 108 | |
ecc30663 AA |
109 | gd_ptr = (struct global_data *)base; |
110 | /* zero the area */ | |
af6bbd4d | 111 | memset(gd_ptr, '\0', sizeof(*gd)); |
ecc30663 | 112 | /* set GD unless architecture did it already */ |
af7a5551 | 113 | #if !defined(CONFIG_ARM) |
af6bbd4d | 114 | arch_setup_gd(gd_ptr); |
ecc30663 AA |
115 | #endif |
116 | /* next alloc will be higher by one GD plus 16-byte alignment */ | |
117 | base += roundup(sizeof(struct global_data), 16); | |
118 | ||
119 | /* | |
120 | * record early malloc arena start. | |
121 | * Use gd as it is now properly set for all architectures. | |
122 | */ | |
af6bbd4d | 123 | |
f1896c45 | 124 | #if CONFIG_VAL(SYS_MALLOC_F_LEN) |
ecc30663 AA |
125 | /* go down one 'early malloc arena' */ |
126 | gd->malloc_base = base; | |
127 | /* next alloc will be higher by one 'early malloc arena' size */ | |
f1896c45 | 128 | base += CONFIG_VAL(SYS_MALLOC_F_LEN); |
af6bbd4d | 129 | #endif |
af6bbd4d | 130 | } |
496c5483 HS |
131 | |
132 | /* | |
133 | * Board-specific Platform code can reimplement show_boot_progress () if needed | |
134 | */ | |
135 | __weak void show_boot_progress(int val) {} |