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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/compat.c | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * We keep the old params compatibility cruft in one place (here) | |
11 | * so we don't end up with lots of mess around other places. | |
12 | * | |
13 | * NOTE: | |
14 | * The old struct param_struct is deprecated, but it will be kept in | |
15 | * the kernel for 5 years from now (2001). This will allow boot loaders | |
16 | * to convert to the new struct tag way. | |
17 | */ | |
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/init.h> | |
22 | ||
23 | #include <asm/setup.h> | |
24 | #include <asm/mach-types.h> | |
25 | #include <asm/page.h> | |
26 | ||
27 | #include <asm/mach/arch.h> | |
28 | ||
0fc1c832 BD |
29 | #include "compat.h" |
30 | ||
1da177e4 LT |
31 | /* |
32 | * Usage: | |
33 | * - do not go blindly adding fields, add them at the end | |
34 | * - when adding fields, don't rely on the address until | |
35 | * a patch from me has been released | |
36 | * - unused fields should be zero (for future expansion) | |
37 | * - this structure is relatively short-lived - only | |
38 | * guaranteed to contain useful data in setup_arch() | |
39 | * | |
40 | * This is the old deprecated way to pass parameters to the kernel | |
41 | */ | |
42 | struct param_struct { | |
43 | union { | |
44 | struct { | |
45 | unsigned long page_size; /* 0 */ | |
46 | unsigned long nr_pages; /* 4 */ | |
47 | unsigned long ramdisk_size; /* 8 */ | |
48 | unsigned long flags; /* 12 */ | |
49 | #define FLAG_READONLY 1 | |
50 | #define FLAG_RDLOAD 4 | |
51 | #define FLAG_RDPROMPT 8 | |
52 | unsigned long rootdev; /* 16 */ | |
53 | unsigned long video_num_cols; /* 20 */ | |
54 | unsigned long video_num_rows; /* 24 */ | |
55 | unsigned long video_x; /* 28 */ | |
56 | unsigned long video_y; /* 32 */ | |
57 | unsigned long memc_control_reg; /* 36 */ | |
58 | unsigned char sounddefault; /* 40 */ | |
59 | unsigned char adfsdrives; /* 41 */ | |
60 | unsigned char bytes_per_char_h; /* 42 */ | |
61 | unsigned char bytes_per_char_v; /* 43 */ | |
62 | unsigned long pages_in_bank[4]; /* 44 */ | |
63 | unsigned long pages_in_vram; /* 60 */ | |
64 | unsigned long initrd_start; /* 64 */ | |
65 | unsigned long initrd_size; /* 68 */ | |
66 | unsigned long rd_start; /* 72 */ | |
67 | unsigned long system_rev; /* 76 */ | |
68 | unsigned long system_serial_low; /* 80 */ | |
69 | unsigned long system_serial_high; /* 84 */ | |
70 | unsigned long mem_fclk_21285; /* 88 */ | |
71 | } s; | |
72 | char unused[256]; | |
73 | } u1; | |
74 | union { | |
75 | char paths[8][128]; | |
76 | struct { | |
77 | unsigned long magic; | |
78 | char n[1024 - sizeof(unsigned long)]; | |
79 | } s; | |
80 | } u2; | |
81 | char commandline[COMMAND_LINE_SIZE]; | |
82 | }; | |
83 | ||
84 | static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size) | |
85 | { | |
86 | tag = tag_next(tag); | |
87 | tag->hdr.tag = ATAG_MEM; | |
88 | tag->hdr.size = tag_size(tag_mem32); | |
89 | tag->u.mem.size = size; | |
90 | tag->u.mem.start = start; | |
91 | ||
92 | return tag; | |
93 | } | |
94 | ||
95 | static void __init build_tag_list(struct param_struct *params, void *taglist) | |
96 | { | |
97 | struct tag *tag = taglist; | |
98 | ||
99 | if (params->u1.s.page_size != PAGE_SIZE) { | |
100 | printk(KERN_WARNING "Warning: bad configuration page, " | |
101 | "trying to continue\n"); | |
102 | return; | |
103 | } | |
104 | ||
105 | printk(KERN_DEBUG "Converting old-style param struct to taglist\n"); | |
106 | ||
107 | #ifdef CONFIG_ARCH_NETWINDER | |
108 | if (params->u1.s.nr_pages != 0x02000 && | |
109 | params->u1.s.nr_pages != 0x04000 && | |
110 | params->u1.s.nr_pages != 0x08000 && | |
111 | params->u1.s.nr_pages != 0x10000) { | |
112 | printk(KERN_WARNING "Warning: bad NeTTrom parameters " | |
113 | "detected, using defaults\n"); | |
114 | ||
115 | params->u1.s.nr_pages = 0x1000; /* 16MB */ | |
116 | params->u1.s.ramdisk_size = 0; | |
117 | params->u1.s.flags = FLAG_READONLY; | |
118 | params->u1.s.initrd_start = 0; | |
119 | params->u1.s.initrd_size = 0; | |
120 | params->u1.s.rd_start = 0; | |
121 | } | |
122 | #endif | |
123 | ||
124 | tag->hdr.tag = ATAG_CORE; | |
125 | tag->hdr.size = tag_size(tag_core); | |
126 | tag->u.core.flags = params->u1.s.flags & FLAG_READONLY; | |
127 | tag->u.core.pagesize = params->u1.s.page_size; | |
128 | tag->u.core.rootdev = params->u1.s.rootdev; | |
129 | ||
130 | tag = tag_next(tag); | |
131 | tag->hdr.tag = ATAG_RAMDISK; | |
132 | tag->hdr.size = tag_size(tag_ramdisk); | |
133 | tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) | | |
134 | (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0); | |
135 | tag->u.ramdisk.size = params->u1.s.ramdisk_size; | |
136 | tag->u.ramdisk.start = params->u1.s.rd_start; | |
137 | ||
138 | tag = tag_next(tag); | |
139 | tag->hdr.tag = ATAG_INITRD; | |
140 | tag->hdr.size = tag_size(tag_initrd); | |
141 | tag->u.initrd.start = params->u1.s.initrd_start; | |
142 | tag->u.initrd.size = params->u1.s.initrd_size; | |
143 | ||
144 | tag = tag_next(tag); | |
145 | tag->hdr.tag = ATAG_SERIAL; | |
146 | tag->hdr.size = tag_size(tag_serialnr); | |
147 | tag->u.serialnr.low = params->u1.s.system_serial_low; | |
148 | tag->u.serialnr.high = params->u1.s.system_serial_high; | |
149 | ||
150 | tag = tag_next(tag); | |
151 | tag->hdr.tag = ATAG_REVISION; | |
152 | tag->hdr.size = tag_size(tag_revision); | |
153 | tag->u.revision.rev = params->u1.s.system_rev; | |
154 | ||
155 | #ifdef CONFIG_ARCH_ACORN | |
156 | if (machine_is_riscpc()) { | |
157 | int i; | |
158 | for (i = 0; i < 4; i++) | |
159 | tag = memtag(tag, PHYS_OFFSET + (i << 26), | |
160 | params->u1.s.pages_in_bank[i] * PAGE_SIZE); | |
161 | } else | |
162 | #endif | |
163 | tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE); | |
164 | ||
165 | #ifdef CONFIG_FOOTBRIDGE | |
166 | if (params->u1.s.mem_fclk_21285) { | |
167 | tag = tag_next(tag); | |
168 | tag->hdr.tag = ATAG_MEMCLK; | |
169 | tag->hdr.size = tag_size(tag_memclk); | |
170 | tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285; | |
171 | } | |
172 | #endif | |
173 | ||
174 | #ifdef CONFIG_ARCH_EBSA285 | |
175 | if (machine_is_ebsa285()) { | |
176 | tag = tag_next(tag); | |
177 | tag->hdr.tag = ATAG_VIDEOTEXT; | |
178 | tag->hdr.size = tag_size(tag_videotext); | |
179 | tag->u.videotext.x = params->u1.s.video_x; | |
180 | tag->u.videotext.y = params->u1.s.video_y; | |
181 | tag->u.videotext.video_page = 0; | |
182 | tag->u.videotext.video_mode = 0; | |
183 | tag->u.videotext.video_cols = params->u1.s.video_num_cols; | |
184 | tag->u.videotext.video_ega_bx = 0; | |
185 | tag->u.videotext.video_lines = params->u1.s.video_num_rows; | |
186 | tag->u.videotext.video_isvga = 1; | |
187 | tag->u.videotext.video_points = 8; | |
188 | } | |
189 | #endif | |
190 | ||
191 | #ifdef CONFIG_ARCH_ACORN | |
192 | tag = tag_next(tag); | |
193 | tag->hdr.tag = ATAG_ACORN; | |
194 | tag->hdr.size = tag_size(tag_acorn); | |
195 | tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg; | |
196 | tag->u.acorn.vram_pages = params->u1.s.pages_in_vram; | |
197 | tag->u.acorn.sounddefault = params->u1.s.sounddefault; | |
198 | tag->u.acorn.adfsdrives = params->u1.s.adfsdrives; | |
199 | #endif | |
200 | ||
201 | tag = tag_next(tag); | |
202 | tag->hdr.tag = ATAG_CMDLINE; | |
203 | tag->hdr.size = (strlen(params->commandline) + 3 + | |
204 | sizeof(struct tag_header)) >> 2; | |
205 | strcpy(tag->u.cmdline.cmdline, params->commandline); | |
206 | ||
207 | tag = tag_next(tag); | |
208 | tag->hdr.tag = ATAG_NONE; | |
209 | tag->hdr.size = 0; | |
210 | ||
211 | memmove(params, taglist, ((int)tag) - ((int)taglist) + | |
212 | sizeof(struct tag_header)); | |
213 | } | |
214 | ||
215 | void __init convert_to_tag_list(struct tag *tags) | |
216 | { | |
217 | struct param_struct *params = (struct param_struct *)tags; | |
218 | build_tag_list(params, ¶ms->u2); | |
219 | } | |
220 | ||
221 | void __init squash_mem_tags(struct tag *tag) | |
222 | { | |
223 | for (; tag->hdr.size; tag = tag_next(tag)) | |
224 | if (tag->hdr.tag == ATAG_MEM) | |
225 | tag->hdr.tag = ATAG_NONE; | |
226 | } |