arch/arm/kernel/compat.c

   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 #include <linux/config.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/setup.h>
  20 #include <asm/mach-types.h>
  21 #include <asm/page.h>
  22
  23 #include <asm/mach/arch.h>
  24
  25 static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size)
  26 {
  27         tag = tag_next(tag);
  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;
  32
  33         return tag;
  34 }
  35
  36 static void __init build_tag_list(struct param_struct *params, void *taglist)
  37 {
  38         struct tag *tag = taglist;
  39
  40         if (params->u1.s.page_size != PAGE_SIZE) {
  41                 printk(KERN_WARNING "Warning: bad configuration page, "
  42                        "trying to continue\n");
  43                 return;
  44         }
  45
  46         printk(KERN_DEBUG "Converting old-style param struct to taglist\n");
  47
  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");
  55
  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;
  62         }
  63 #endif
  64
  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;
  70
  71         tag = tag_next(tag);
  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;
  78
  79         tag = tag_next(tag);
  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;
  84
  85         tag = tag_next(tag);
  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;
  90
  91         tag = tag_next(tag);
  92         tag->hdr.tag = ATAG_REVISION;
  93         tag->hdr.size = tag_size(tag_revision);
  94         tag->u.revision.rev = params->u1.s.system_rev;
  95
  96 #ifdef CONFIG_ARCH_ACORN
  97         if (machine_is_riscpc()) {
  98                 int i;
  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);
 102         } else
 103 #endif
 104         tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);
 105
 106 #ifdef CONFIG_FOOTBRIDGE
 107         if (params->u1.s.mem_fclk_21285) {
 108                 tag = tag_next(tag);
 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;
 112         }
 113 #endif
 114
 115 #ifdef CONFIG_ARCH_EBSA285
 116         if (machine_is_ebsa285()) {
 117                 tag = tag_next(tag);
 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;
 129         }
 130 #endif
 131
 132 #ifdef CONFIG_ARCH_ACORN
 133         tag = tag_next(tag);
 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;
 140 #endif
 141
 142         tag = tag_next(tag);
 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);
 147
 148         tag = tag_next(tag);
 149         tag->hdr.tag = ATAG_NONE;
 150         tag->hdr.size = 0;
 151
 152         memmove(params, taglist, ((int)tag) - ((int)taglist) +
 153                                  sizeof(struct tag_header));
 154 }
 155
 156 void __init convert_to_tag_list(struct tag *tags)
 157 {
 158         struct param_struct *params = (struct param_struct *)tags;
 159         build_tag_list(params, &params->u2);
 160 }
 161
 162 void __init squash_mem_tags(struct tag *tag)
 163 {
 164         for (; tag->hdr.size; tag = tag_next(tag))
 165                 if (tag->hdr.tag == ATAG_MEM)
 166                         tag->hdr.tag = ATAG_NONE;
 167 }