Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ben Dooks | 0fc1c83 | 2006-03-15 23:17:30 +0000 | [diff] [blame] | 29 | #include "compat.h" |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |