]> git.sur5r.net Git - u-boot/blob - arch/x86/cpu/coreboot/sdram.c
x86: Use 'unsigned int' in install_e820_map() functions
[u-boot] / arch / x86 / cpu / coreboot / sdram.c
1 /*
2  * Copyright (c) 2011 The Chromium OS Authors.
3  * (C) Copyright 2010,2011
4  * Graeme Russ, <graeme.russ@gmail.com>
5  *
6  * SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 #include <common.h>
10 #include <asm/e820.h>
11 #include <asm/arch/sysinfo.h>
12
13 DECLARE_GLOBAL_DATA_PTR;
14
15 unsigned int install_e820_map(unsigned int max_entries,
16                               struct e820entry *entries)
17 {
18         unsigned int num_entries;
19         int i;
20
21         num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries);
22         if (num_entries < lib_sysinfo.n_memranges) {
23                 printf("Warning: Limiting e820 map to %d entries.\n",
24                         num_entries);
25         }
26         for (i = 0; i < num_entries; i++) {
27                 struct memrange *memrange = &lib_sysinfo.memrange[i];
28
29                 entries[i].addr = memrange->base;
30                 entries[i].size = memrange->size;
31
32                 /*
33                  * coreboot has some extensions (type 6 & 16) to the E820 types.
34                  * When we detect this, mark it as E820_RESERVED.
35                  */
36                 if (memrange->type == CB_MEM_VENDOR_RSVD ||
37                     memrange->type == CB_MEM_TABLE)
38                         entries[i].type = E820_RESERVED;
39                 else
40                         entries[i].type = memrange->type;
41         }
42
43         return num_entries;
44 }
45
46 /*
47  * This function looks for the highest region of memory lower than 4GB which
48  * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
49  * overrides the default implementation found elsewhere which simply picks the
50  * end of ram, wherever that may be. The location of the stack, the relocation
51  * address, and how far U-Boot is moved by relocation are set in the global
52  * data structure.
53  */
54 ulong board_get_usable_ram_top(ulong total_size)
55 {
56         uintptr_t dest_addr = 0;
57         int i;
58
59         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
60                 struct memrange *memrange = &lib_sysinfo.memrange[i];
61                 /* Force U-Boot to relocate to a page aligned address. */
62                 uint64_t start = roundup(memrange->base, 1 << 12);
63                 uint64_t end = memrange->base + memrange->size;
64
65                 /* Ignore non-memory regions. */
66                 if (memrange->type != CB_MEM_RAM)
67                         continue;
68
69                 /* Filter memory over 4GB. */
70                 if (end > 0xffffffffULL)
71                         end = 0x100000000ULL;
72                 /* Skip this region if it's too small. */
73                 if (end - start < total_size)
74                         continue;
75
76                 /* Use this address if it's the largest so far. */
77                 if (end > dest_addr)
78                         dest_addr = end;
79         }
80
81         /* If no suitable area was found, return an error. */
82         if (!dest_addr)
83                 panic("No available memory found for relocation");
84
85         return (ulong)dest_addr;
86 }
87
88 int dram_init(void)
89 {
90         int i;
91         phys_size_t ram_size = 0;
92
93         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
94                 struct memrange *memrange = &lib_sysinfo.memrange[i];
95                 unsigned long long end = memrange->base + memrange->size;
96
97                 if (memrange->type == CB_MEM_RAM && end > ram_size)
98                         ram_size += memrange->size;
99         }
100
101         gd->ram_size = ram_size;
102         if (ram_size == 0)
103                 return -1;
104
105         return 0;
106 }
107
108 int dram_init_banksize(void)
109 {
110         int i, j;
111
112         if (CONFIG_NR_DRAM_BANKS) {
113                 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
114                         struct memrange *memrange = &lib_sysinfo.memrange[i];
115
116                         if (memrange->type == CB_MEM_RAM) {
117                                 gd->bd->bi_dram[j].start = memrange->base;
118                                 gd->bd->bi_dram[j].size = memrange->size;
119                                 j++;
120                                 if (j >= CONFIG_NR_DRAM_BANKS)
121                                         break;
122                         }
123                 }
124         }
125
126         return 0;
127 }