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
memtag(struct tag * tag,unsigned long start,unsigned long size)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
build_tag_list(struct param_struct * params,void * taglist)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
convert_to_tag_list(struct tag * tags)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