2 * linux/arch/arm/kernel/compat.c
4 * Copyright (C) 2001 Russell King
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.
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.
13 #include <linux/config.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/init.h>
19 #include <asm/setup.h>
20 #include <asm/mach-types.h>
23 #include <asm/mach/arch.h>
25 static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size)
28 tag->hdr.tag = ATAG_MEM;
29 tag->hdr.size = tag_size(tag_mem32);
30 tag->u.mem.size = size;
31 tag->u.mem.start = start;
36 static void __init build_tag_list(struct param_struct *params, void *taglist)
38 struct tag *tag = taglist;
40 if (params->u1.s.page_size != PAGE_SIZE) {
41 printk(KERN_WARNING "Warning: bad configuration page, "
42 "trying to continue\n");
46 printk(KERN_DEBUG "Converting old-style param struct to taglist\n");
48 #ifdef CONFIG_ARCH_NETWINDER
49 if (params->u1.s.nr_pages != 0x02000 &&
50 params->u1.s.nr_pages != 0x04000 &&
51 params->u1.s.nr_pages != 0x08000 &&
52 params->u1.s.nr_pages != 0x10000) {
53 printk(KERN_WARNING "Warning: bad NeTTrom parameters "
54 "detected, using defaults\n");
56 params->u1.s.nr_pages = 0x1000; /* 16MB */
57 params->u1.s.ramdisk_size = 0;
58 params->u1.s.flags = FLAG_READONLY;
59 params->u1.s.initrd_start = 0;
60 params->u1.s.initrd_size = 0;
61 params->u1.s.rd_start = 0;
65 tag->hdr.tag = ATAG_CORE;
66 tag->hdr.size = tag_size(tag_core);
67 tag->u.core.flags = params->u1.s.flags & FLAG_READONLY;
68 tag->u.core.pagesize = params->u1.s.page_size;
69 tag->u.core.rootdev = params->u1.s.rootdev;
72 tag->hdr.tag = ATAG_RAMDISK;
73 tag->hdr.size = tag_size(tag_ramdisk);
74 tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
75 (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
76 tag->u.ramdisk.size = params->u1.s.ramdisk_size;
77 tag->u.ramdisk.start = params->u1.s.rd_start;
80 tag->hdr.tag = ATAG_INITRD;
81 tag->hdr.size = tag_size(tag_initrd);
82 tag->u.initrd.start = params->u1.s.initrd_start;
83 tag->u.initrd.size = params->u1.s.initrd_size;
86 tag->hdr.tag = ATAG_SERIAL;
87 tag->hdr.size = tag_size(tag_serialnr);
88 tag->u.serialnr.low = params->u1.s.system_serial_low;
89 tag->u.serialnr.high = params->u1.s.system_serial_high;
92 tag->hdr.tag = ATAG_REVISION;
93 tag->hdr.size = tag_size(tag_revision);
94 tag->u.revision.rev = params->u1.s.system_rev;
96 #ifdef CONFIG_ARCH_ACORN
97 if (machine_is_riscpc()) {
99 for (i = 0; i < 4; i++)
100 tag = memtag(tag, PHYS_OFFSET + (i << 26),
101 params->u1.s.pages_in_bank[i] * PAGE_SIZE);
104 tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);
106 #ifdef CONFIG_FOOTBRIDGE
107 if (params->u1.s.mem_fclk_21285) {
109 tag->hdr.tag = ATAG_MEMCLK;
110 tag->hdr.size = tag_size(tag_memclk);
111 tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285;
115 #ifdef CONFIG_ARCH_EBSA285
116 if (machine_is_ebsa285()) {
118 tag->hdr.tag = ATAG_VIDEOTEXT;
119 tag->hdr.size = tag_size(tag_videotext);
120 tag->u.videotext.x = params->u1.s.video_x;
121 tag->u.videotext.y = params->u1.s.video_y;
122 tag->u.videotext.video_page = 0;
123 tag->u.videotext.video_mode = 0;
124 tag->u.videotext.video_cols = params->u1.s.video_num_cols;
125 tag->u.videotext.video_ega_bx = 0;
126 tag->u.videotext.video_lines = params->u1.s.video_num_rows;
127 tag->u.videotext.video_isvga = 1;
128 tag->u.videotext.video_points = 8;
132 #ifdef CONFIG_ARCH_ACORN
134 tag->hdr.tag = ATAG_ACORN;
135 tag->hdr.size = tag_size(tag_acorn);
136 tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg;
137 tag->u.acorn.vram_pages = params->u1.s.pages_in_vram;
138 tag->u.acorn.sounddefault = params->u1.s.sounddefault;
139 tag->u.acorn.adfsdrives = params->u1.s.adfsdrives;
143 tag->hdr.tag = ATAG_CMDLINE;
144 tag->hdr.size = (strlen(params->commandline) + 3 +
145 sizeof(struct tag_header)) >> 2;
146 strcpy(tag->u.cmdline.cmdline, params->commandline);
149 tag->hdr.tag = ATAG_NONE;
152 memmove(params, taglist, ((int)tag) - ((int)taglist) +
153 sizeof(struct tag_header));
156 void __init convert_to_tag_list(struct tag *tags)
158 struct param_struct *params = (struct param_struct *)tags;
159 build_tag_list(params, ¶ms->u2);
162 void __init squash_mem_tags(struct tag *tag)
164 for (; tag->hdr.size; tag = tag_next(tag))
165 if (tag->hdr.tag == ATAG_MEM)
166 tag->hdr.tag = ATAG_NONE;