arch/mips/sibyte/sb1250/prom.c

   1 /*
   2  * Copyright (C) 2000, 2001 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #include <linux/config.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mm.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/smp.h>
  26 #include <linux/initrd.h>
  27
  28 #include <asm/bootinfo.h>
  29 #include <asm/reboot.h>
  30
  31 #define MAX_RAM_SIZE ((CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024) - 1)
  32
  33 static __init void prom_meminit(void)
  34 {
  35 #ifdef CONFIG_BLK_DEV_INITRD
  36         unsigned long initrd_pstart;
  37         unsigned long initrd_pend;
  38
  39         initrd_pstart = __pa(initrd_start);
  40         initrd_pend = __pa(initrd_end);
  41         if (initrd_start &&
  42             ((initrd_pstart > MAX_RAM_SIZE)
  43              || (initrd_pend > MAX_RAM_SIZE))) {
  44                 panic("initrd out of addressable memory");
  45         }
  46
  47         add_memory_region(0, initrd_pstart,
  48                           BOOT_MEM_RAM);
  49         add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
  50                           BOOT_MEM_RESERVED);
  51         add_memory_region(initrd_pend,
  52                           (CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024) - initrd_pend,
  53                           BOOT_MEM_RAM);
  54 #else
  55         add_memory_region(0, CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024,
  56                           BOOT_MEM_RAM);
  57 #endif
  58 }
  59
  60 void prom_cpu0_exit(void *unused)
  61 {
  62         while (1) ;
  63 }
  64
  65 static void prom_linux_exit(void)
  66 {
  67 #ifdef CONFIG_SMP
  68         if (smp_processor_id()) {
  69                 smp_call_function(prom_cpu0_exit,NULL,1,1);
  70         }
  71 #endif
  72         while(1);
  73 }
  74
  75 /*
  76  * prom_init is called just after the cpu type is determined, from setup_arch()
  77  */
  78 void __init prom_init(void)
  79 {
  80         _machine_restart   = (void (*)(char *))prom_linux_exit;
  81         _machine_halt      = prom_linux_exit;
  82         _machine_power_off = prom_linux_exit;
  83
  84         strcpy(arcs_cmdline, "root=/dev/ram0 ");
  85
  86         mips_machgroup = MACH_GROUP_SIBYTE;
  87         prom_meminit();
  88 }
  89
  90 unsigned long __init prom_free_prom_memory(void)
  91 {
  92         /* Not sure what I'm supposed to do here.  Nothing, I think */
  93         return 0;
  94 }
  95
  96 void prom_putchar(char c)
  97 {
  98 }