1 /*
2 *
3 * Copyright (C) 2008 Advanced Micro Devices, Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <libpayload-config.h>
30 #include <libpayload.h>
31 #include <multiboot_tables.h>
32
33 unsigned long loader_eax; /* The value of EAX passed from the loader */
34 unsigned long loader_ebx; /* The value of EBX passed from the loader */
35
mb_add_memrange(struct sysinfo_t * info,unsigned long long base,unsigned long long size,unsigned int type)36 static int mb_add_memrange(struct sysinfo_t *info, unsigned long long base,
37 unsigned long long size, unsigned int type)
38 {
39 if (info->n_memranges >= SYSINFO_MAX_MEM_RANGES)
40 return -1;
41
42 #if CONFIG(LP_MEMMAP_RAM_ONLY)
43 /* 1 == normal RAM. Ignore everything else for now */
44 if (type != 1)
45 return 0;
46 #endif
47
48 info->memrange[info->n_memranges].base = base;
49 info->memrange[info->n_memranges].size = size;
50 info->memrange[info->n_memranges].type = type;
51 info->n_memranges++;
52
53 return 0;
54 }
55
mb_parse_mmap(struct multiboot_header * table,struct sysinfo_t * info)56 static void mb_parse_mmap(struct multiboot_header *table,
57 struct sysinfo_t *info)
58 {
59 u8 *start = (u8 *) phys_to_virt(table->mmap_addr);
60 u8 *ptr = start;
61
62 info->n_memranges = 0;
63
64 while(ptr < (start + table->mmap_length)) {
65 struct multiboot_mmap *mmap = (struct multiboot_mmap *) ptr;
66
67 if (mb_add_memrange(info, mmap->addr, mmap->length, mmap->type))
68 return;
69
70 ptr += (mmap->size + sizeof(mmap->size));
71 }
72 }
73
mb_parse_meminfo(struct multiboot_header * table,struct sysinfo_t * info)74 static void mb_parse_meminfo(struct multiboot_header *table,
75 struct sysinfo_t *info)
76 {
77 unsigned long long mem_low = table->mem_lower;
78 unsigned long long mem_high = table->mem_higher;
79
80 info->n_memranges = 0;
81
82 if (mem_low)
83 mb_add_memrange(info, 0 * MiB, mem_low * KiB, 1);
84
85 if (mem_high)
86 mb_add_memrange(info, 1 * MiB, mem_high * KiB, 1);
87 }
88
mb_parse_cmdline(struct multiboot_header * table)89 static void mb_parse_cmdline(struct multiboot_header *table)
90 {
91 extern int main_argc;
92 extern char *main_argv[];
93 char *c = phys_to_virt(table->cmdline);
94
95 while(*c != '\0' && main_argc < MAX_ARGC_COUNT) {
96 main_argv[main_argc++] = c;
97
98 for( ; *c != '\0' && !isspace(*c); c++);
99
100 if (*c) {
101 *c = 0;
102 c++;
103 }
104 }
105 }
106
get_multiboot_info(struct sysinfo_t * info)107 int get_multiboot_info(struct sysinfo_t *info)
108 {
109 struct multiboot_header *table;
110
111 if (loader_eax != MULTIBOOT_MAGIC)
112 return -1;
113
114 table = (struct multiboot_header *) phys_to_virt(loader_ebx);
115
116 info->mbtable = phys_to_virt(loader_ebx);
117
118 if (table->flags & MULTIBOOT_FLAGS_MMAP)
119 mb_parse_mmap(table, info);
120 else if (table->flags & MULTIBOOT_FLAGS_MEMINFO)
121 mb_parse_meminfo(table, info);
122
123 if (table->flags & MULTIBOOT_FLAGS_CMDLINE)
124 mb_parse_cmdline(table);
125
126 return 0;
127 }
128