/* * Copyright (C) 2000, 2001 Broadcom Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */#include <linux/config.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/blk.h>#include <linux/bootmem.h>#include <linux/smp.h>#include <asm/bootinfo.h>#include <asm/reboot.h>extern char arcs_cmdline[];#ifdef CONFIG_EMBEDDED_RAMDISK/* These are symbols defined by the ramdisk linker script */extern unsigned char __rd_start;extern unsigned char __rd_end;#endif#define MAX_RAM_SIZE ((CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024) - 1)static __init void prom_meminit(void){#ifdef CONFIG_BLK_DEV_INITRD	unsigned long initrd_pstart;	unsigned long initrd_pend;#ifdef CONFIG_EMBEDDED_RAMDISK	/* If we're using an embedded ramdisk, then __rd_start and __rd_end	   are defined by the linker to be on either side of the ramdisk	   area.  Otherwise, initrd_start should be defined by kernel command	   line arguments */	if (initrd_start == 0) {		initrd_start = (unsigned long)&__rd_start;		initrd_end = (unsigned long)&__rd_end;	}#endif	initrd_pstart = __pa(initrd_start);	initrd_pend = __pa(initrd_end);	if (initrd_start &&	    ((initrd_pstart > MAX_RAM_SIZE)	     || (initrd_pend > MAX_RAM_SIZE))) {		panic("initrd out of addressable memory");	}	add_memory_region(0, initrd_pstart,			  BOOT_MEM_RAM);	add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,			  BOOT_MEM_RESERVED);	add_memory_region(initrd_pend,			  (CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024) - initrd_pend,			  BOOT_MEM_RAM);#else	add_memory_region(0, CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024,			  BOOT_MEM_RAM);#endif}void prom_cpu0_exit(void *unused){        while (1) ;}static void prom_linux_exit(void){#ifdef CONFIG_SMP	if (smp_processor_id()) {		smp_call_function(prom_cpu0_exit,NULL,1,1);	}#endif	while(1);}/* * prom_init is called just after the cpu type is determined, from init_arch() */__init int prom_init(int argc, char **argv, char **envp, int *prom_vec){	_machine_restart   = (void (*)(char *))prom_linux_exit;	_machine_halt      = prom_linux_exit;	_machine_power_off = prom_linux_exit;	strcpy(arcs_cmdline, "root=/dev/ram0 ");	mips_machgroup = MACH_GROUP_SIBYTE;	prom_meminit();	return 0;}void prom_free_prom_memory(void){	/* Not sure what I'm supposed to do here.  Nothing, I think */}int page_is_ram(unsigned long pagenr){	phys_t addr = pagenr << PAGE_SHIFT;	return (addr < (CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024));}