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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 | */ |
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 | |
29 | #include "compat.h" |
30 | |
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 |
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