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   1 /*
   2  *  linux/arch/arm/kernel/arch.c
   3  *
   4  *  Architecture specific fixups.
   5  */
   6 #include <linux/config.h>
   7 #include <linux/init.h>
   8 #include <linux/types.h>
   9
  10 #include <asm/elf.h>
  11 #include <asm/page.h>
  12 #include <asm/setup.h>
  13 #include <asm/mach/arch.h>
  14
  15 unsigned int vram_size;
  16
  17 #ifdef CONFIG_ARCH_ACORN
  18
  19 unsigned int memc_ctrl_reg;
  20 unsigned int number_mfm_drives;
  21
  22 static int __init parse_tag_acorn(const struct tag *tag)
  23 {
  24         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  25         number_mfm_drives = tag->u.acorn.adfsdrives;
  26
  27         switch (tag->u.acorn.vram_pages) {
  28         case 512:
  29                 vram_size += PAGE_SIZE * 256;
  30         case 256:
  31                 vram_size += PAGE_SIZE * 256;
  32         default:
  33                 break;
  34         }
  35 #if 0
  36         if (vram_size) {
  37                 desc->video_start = 0x02000000;
  38                 desc->video_end   = 0x02000000 + vram_size;
  39         }
  40 #endif
  41         return 0;
  42 }
  43
  44 __tagtable(ATAG_ACORN, parse_tag_acorn);
  45
  46 #endif