arch/arm/kernel/arch.c

   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-types.h>
  14 #include <asm/mach/arch.h>
  15
  16 unsigned int vram_size;
  17
  18 #ifdef CONFIG_ARCH_ACORN
  19
  20 unsigned int memc_ctrl_reg;
  21 unsigned int number_mfm_drives;
  22
  23 static int __init parse_tag_acorn(const struct tag *tag)
  24 {
  25         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  26         number_mfm_drives = tag->u.acorn.adfsdrives;
  27
  28         switch (tag->u.acorn.vram_pages) {
  29         case 512:
  30                 vram_size += PAGE_SIZE * 256;
  31         case 256:
  32                 vram_size += PAGE_SIZE * 256;
  33         default:
  34                 break;
  35         }
  36 #if 0
  37         if (vram_size) {
  38                 desc->video_start = 0x02000000;
  39                 desc->video_end   = 0x02000000 + vram_size;
  40         }
  41 #endif
  42         return 0;
  43 }
  44
  45 __tagtable(ATAG_ACORN, parse_tag_acorn);
  46
  47 #endif