text: /*
   * Common prep/pmac/chrp boot and setup code.
   */
  
  #include <linux/module.h>
  #include <linux/string.h>
  #include <linux/sched.h>
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/reboot.h>
  #include <linux/delay.h>
  #include <linux/initrd.h>
  #if defined(CONFIG_IDE) || defined(CONFIG_IDE_MODULE)
  #include <linux/ide.h>
  #endif
  #include <linux/tty.h>
  #include <linux/bootmem.h>
  #include <linux/seq_file.h>
  #include <linux/root_dev.h>
  #include <linux/cpu.h>
  #include <linux/console.h>
  
  #include <asm/io.h>
  #include <asm/prom.h>
  #include <asm/processor.h>
  #include <asm/pgtable.h>
  #include <asm/setup.h>
  #include <asm/smp.h>
  #include <asm/elf.h>
  #include <asm/cputable.h>
  #include <asm/bootx.h>
  #include <asm/btext.h>
  #include <asm/machdep.h>
  #include <asm/uaccess.h>
  #include <asm/system.h>
  #include <asm/pmac_feature.h>
  #include <asm/sections.h>
  #include <asm/nvram.h>
  #include <asm/xmon.h>
  #include <asm/time.h>
  #include <asm/serial.h>
  #include <asm/udbg.h>
  
  #include "setup.h"
  
  #define DBG(fmt...)
  
  #if defined CONFIG_KGDB
  #include <asm/kgdb.h>
  #endif
  
  extern void bootx_init(unsigned long r4, unsigned long phys);
  
  #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  struct ide_machdep_calls ppc_ide_md;
  EXPORT_SYMBOL(ppc_ide_md);
  #endif
  
  int boot_cpuid;
  EXPORT_SYMBOL_GPL(boot_cpuid);
  int boot_cpuid_phys;
  
  unsigned long ISA_DMA_THRESHOLD;
  unsigned int DMA_MODE_READ;
  unsigned int DMA_MODE_WRITE;
  
  int have_of = 1;
  
  #ifdef CONFIG_VGA_CONSOLE
  unsigned long vgacon_remap_base;
  EXPORT_SYMBOL(vgacon_remap_base);
  #endif
  
  /*
   * These are used in binfmt_elf.c to put aux entries on the stack
   * for each elf executable being started.
   */
  int dcache_bsize;
  int icache_bsize;
  int ucache_bsize;
  
  /*
   * We're called here very early in the boot.  We determine the machine
   * type and call the appropriate low-level setup functions.
   *  -- Cort <cort@fsmlabs.com>
   *
   * Note that the kernel may be running at an address which is different
   * from the address that it was linked at, so we must use RELOC/PTRRELOC
   * to access static data (including strings).  -- paulus
   */
  unsigned long __init early_init(unsigned long dt_ptr)
  {
  	unsigned long offset = reloc_offset();
  	struct cpu_spec *spec;
  
  	/* First zero the BSS -- use memset_io, some platforms don't have
  	 * caches on yet */
  	memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  			__bss_stop - __bss_start);
  
  	/*
  	 * Identify the CPU type and fix up code sections
  	 * that depend on which cpu we have.
  	 */
  	spec = identify_cpu(offset, mfspr(SPRN_PVR));
  
  	do_feature_fixups(spec->cpu_features,
  			  PTRRELOC(&__start___ftr_fixup),
  			  PTRRELOC(&__stop___ftr_fixup));
  
  	return KERNELBASE + offset;
  }
  
  
  /*
   * Find out what kind of machine we're on and save any data we need
   * from the early boot process (devtree is copied on pmac by prom_init()).
   * This is called very early on the boot process, after a minimal
   * MMU environment has been set up but before MMU_init is called.
   */
  void __init machine_init(unsigned long dt_ptr, unsigned long phys)
  {
  	/* Enable early debugging if any specified (see udbg.h) */
  	udbg_early_init();
  
  	/* Do some early initialization based on the flat device tree */
  	early_init_devtree(__va(dt_ptr));
  
  	probe_machine();
  
  #ifdef CONFIG_6xx
  	if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
  	    cpu_has_feature(CPU_FTR_CAN_NAP))
  		ppc_md.power_save = ppc6xx_idle;
  #endif
  
  	if (ppc_md.progress)
  		ppc_md.progress("id mach(): done", 0x200);
  }
  
  #ifdef CONFIG_BOOKE_WDT
  /* Checks wdt=x and wdt_period=xx command-line option */
  int __init early_parse_wdt(char *p)
  {
  	if (p && strncmp(p, "0", 1) != 0)
  	       booke_wdt_enabled = 1;
  
  	return 0;
  }
  early_param("wdt", early_parse_wdt);
  
  int __init early_parse_wdt_period (char *p)
  {
  	if (p)
  		booke_wdt_period = simple_strtoul(p, NULL, 0);
  
  	return 0;
  }
  early_param("wdt_period", early_parse_wdt_period);
  #endif	/* CONFIG_BOOKE_WDT */
  
  /* Checks "l2cr=xxxx" command-line option */
  int __init ppc_setup_l2cr(char *str)
  {
  	if (cpu_has_feature(CPU_FTR_L2CR)) {
  		unsigned long val = simple_strtoul(str, NULL, 0);
  		printk(KERN_INFO "l2cr set to %lx\n", val);
  		_set_L2CR(0);		/* force invalidate by disable cache */
  		_set_L2CR(val);		/* and enable it */
  	}
  	return 1;
  }
  __setup("l2cr=", ppc_setup_l2cr);
  
  #ifdef CONFIG_GENERIC_NVRAM
  
  /* Generic nvram hooks used by drivers/char/gen_nvram.c */
  unsigned char nvram_read_byte(int addr)
  {
  	if (ppc_md.nvram_read_val)
  		return ppc_md.nvram_read_val(addr);
  	return 0xff;
  }
  EXPORT_SYMBOL(nvram_read_byte);
  
  void nvram_write_byte(unsigned char val, int addr)
  {
  	if (ppc_md.nvram_write_val)
  		ppc_md.nvram_write_val(addr, val);
  }
  EXPORT_SYMBOL(nvram_write_byte);
  
  void nvram_sync(void)
  {
  	if (ppc_md.nvram_sync)
  		ppc_md.nvram_sync();
  }
  EXPORT_SYMBOL(nvram_sync);
  
  #endif /* CONFIG_NVRAM */
  
  static DEFINE_PER_CPU(struct cpu, cpu_devices);
  
  int __init ppc_init(void)
  {
  	int cpu;
  
  	/* clear the progress line */
  	if (ppc_md.progress)
  		ppc_md.progress("             ", 0xffff);
  
  	/* register CPU devices */
  	for_each_possible_cpu(cpu) {
  		struct cpu *c = &per_cpu(cpu_devices, cpu);
  		c->hotpluggable = 1;
  		register_cpu(c, cpu);
  	}
  
  	/* call platform init */
  	if (ppc_md.init != NULL) {
  		ppc_md.init();
  	}
  	return 0;
  }
  
  arch_initcall(ppc_init);
  
  /* Warning, IO base is not yet inited */
  void __init setup_arch(char **cmdline_p)
  {
  	*cmdline_p = cmd_line;
  
  	/* so udelay does something sensible, assume <= 1000 bogomips */
  	loops_per_jiffy = 500000000 / HZ;
  
  	unflatten_device_tree();
  	check_for_initrd();
  
  	if (ppc_md.init_early)
  		ppc_md.init_early();
  
  	find_legacy_serial_ports();
  
  	smp_setup_cpu_maps();
  
  	/* Register early console */
  	register_early_udbg_console();
  
  	xmon_setup();
  
  #if defined(CONFIG_KGDB)
  	if (ppc_md.kgdb_map_scc)
  		ppc_md.kgdb_map_scc();
  	set_debug_traps();
  	if (strstr(cmd_line, "gdb")) {
  		if (ppc_md.progress)
  			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
  		printk("kgdb breakpoint activated\n");
  		breakpoint();
  	}
  #endif
  
  	/*
  	 * Set cache line size based on type of cpu as a default.
  	 * Systems with OF can look in the properties on the cpu node(s)
  	 * for a possibly more accurate value.
  	 */
  	dcache_bsize = cur_cpu_spec->dcache_bsize;
  	icache_bsize = cur_cpu_spec->icache_bsize;
  	ucache_bsize = 0;
  	if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
  		ucache_bsize = icache_bsize = dcache_bsize;
  
  	/* reboot on panic */
  	panic_timeout = 180;
  
  	if (ppc_md.panic)
  		setup_panic();
  
  	init_mm.start_code = PAGE_OFFSET;
  	init_mm.end_code = (unsigned long) _etext;
  	init_mm.end_data = (unsigned long) _edata;
  	init_mm.brk = klimit;
  
  	/* set up the bootmem stuff with available memory */
  	do_init_bootmem();
  	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
  
  #ifdef CONFIG_DUMMY_CONSOLE
  	conswitchp = &dummy_con;
  #endif
  
  	if (ppc_md.setup_arch)
  		ppc_md.setup_arch();
  	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
  
  	paging_init();
  }
  