path: root/arch/alpha/kernel/setup.c

/*
 *  linux/arch/alpha/kernel/setup.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 */

/* 2.3.x bootmem, 1999 Andrea Arcangeli <andrea@suse.de> */

/*
 * Bootup setup stuff.
 */

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/screen_info.h>
#include <linux/delay.h>
#include <linux/mc146818rtc.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/bootmem.h>
#include <linux/pci.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/initrd.h>
#include <linux/eisa.h>
#include <linux/pfn.h>
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#include <linux/reboot.h>
#endif
#include <linux/notifier.h>
#include <asm/setup.h>
#include <asm/io.h>

extern struct atomic_notifier_head panic_notifier_list;
static int alpha_panic_event(struct notifier_block *, unsigned long, void *);
static struct notifier_block alpha_panic_block = {
	alpha_panic_event,
        NULL,
        INT_MAX /* try to do it first */
};

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/hwrpb.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/console.h>

#include "proto.h"
#include "pci_impl.h"


struct hwrpb_struct *hwrpb;
EXPORT_SYMBOL(hwrpb);
unsigned long srm_hae;

int alpha_l1i_cacheshape;
int alpha_l1d_cacheshape;
int alpha_l2_cacheshape;
int alpha_l3_cacheshape;

#ifdef CONFIG_VERBOSE_MCHECK
/* 0=minimum, 1=verbose, 2=all */
/* These can be overridden via the command line, ie "verbose_mcheck=2") */
unsigned long alpha_verbose_mcheck = CONFIG_VERBOSE_MCHECK_ON;
#endif

/* Which processor we booted from.  */
int boot_cpuid;

/*
 * Using SRM callbacks for initial console output. This works from
 * setup_arch() time through the end of time_init(), as those places
 * are under our (Alpha) control.

 * "srmcons" specified in the boot command arguments allows us to
 * see kernel messages during the period of time before the true
 * console device is "registered" during console_init(). 
 * As of this version (2.5.59), console_init() will call
 * disable_early_printk() as the last action before initializing
 * the console drivers. That's the last possible time srmcons can be 
 * unregistered without interfering with console behavior.
 *
 * By default, OFF; set it with a bootcommand arg of "srmcons" or 
 * "console=srm". The meaning of these two args is:
 *     "srmcons"     - early callback prints 
 *     "console=srm" - full callback based console, including early prints
 */
int srmcons_output = 0;

/* Enforce a memory size limit; useful for testing. By default, none. */
unsigned long mem_size_limit = 0;

/* Set AGP GART window size (0 means disabled). */
unsigned long alpha_agpgart_size = DEFAULT_AGP_APER_SIZE;

#ifdef CONFIG_ALPHA_GENERIC
struct alpha_machine_vector alpha_mv;
int alpha_using_srm;
EXPORT_SYMBOL(alpha_using_srm);
#endif

static struct alpha_machine_vector *get_sysvec(unsigned long, unsigned long,
					       unsigned long);
static struct alpha_machine_vector *get_sysvec_byname(const char *);
static void get_sysnames(unsigned long, unsigned long, unsigned long,
			 char **, char **);
static void determine_cpu_caches (unsigned int);

static char command_line[COMMAND_LINE_SIZE];

/*
 * The format of "screen_info" is strange, and due to early
 * i386-setup code. This is just enough to make the console
 * code think we're on a VGA color display.
 */

struct screen_info screen_info = {
	.orig_x = 0,
	.orig_y = 25,
	.orig_video_cols = 80,
	.orig_video_lines = 25,
	.orig_video_isVGA = 1,
	.orig_video_points = 16
};

EXPORT_SYMBOL(screen_info);

/*
 * The direct map I/O window, if any.  This should be the same
 * for all busses, since it's used by virt_to_bus.
 */

unsigned long __direct_map_base;
unsigned long __direct_map_size;
EXPORT_SYMBOL(__direct_map_base);
EXPORT_SYMBOL(__direct_map_size);

/*
 * Declare all of the machine vectors.
 */

/* GCC 2.7.2 (on alpha at least) is lame.  It does not support either 
   __attribute__((weak)) or #pragma weak.  Bypass it and talk directly
   to the assembler.  */

#define WEAK(X) \
	extern struct alpha_machine_vector X; \
	asm(".weak "#X)

WEAK(alcor_mv);
WEAK(alphabook1_mv);
WEAK(avanti_mv);
WEAK(cabriolet_mv);
WEAK(clipper_mv);
WEAK(dp264_mv);
WEAK(eb164_mv);
WEAK(eb64p_mv);
WEAK(eb66_mv);
WEAK(eb66p_mv);
WEAK(eiger_mv);
WEAK(jensen_mv);
WEAK(lx164_mv);
WEAK(lynx_mv);
WEAK(marvel_ev7_mv);
WEAK(miata_mv);
WEAK(mikasa_mv);
WEAK(mikasa_primo_mv);
WEAK(monet_mv);
WEAK(nautilus_mv);
WEAK(noname_mv);
WEAK(noritake_mv);
WEAK(noritake_primo_mv);
WEAK(p2k_mv);
WEAK(pc164_mv);
WEAK(privateer_mv);
WEAK(rawhide_mv);
WEAK(ruffian_mv);
WEAK(rx164_mv);
WEAK(sable_mv);
WEAK(sable_gamma_mv);
WEAK(shark_mv);
WEAK(sx164_mv);
WEAK(takara_mv);
WEAK(titan_mv);
WEAK(webbrick_mv);
WEAK(wildfire_mv);
WEAK(xl_mv);
WEAK(xlt_mv);

#undef WEAK

/*
 * I/O resources inherited from PeeCees.  Except for perhaps the
 * turbochannel alphas, everyone has these on some sort of SuperIO chip.
 *
 * ??? If this becomes less standard, move the struct out into the
 * machine vector.
 */

static void __init
reserve_std_resources(void)
{
	static struct resource standard_io_resources[] = {
		{ .name = "rtc", .start = -1, .end = -1 },
        	{ .name = "dma1", .start = 0x00, .end = 0x1f },
        	{ .name = "pic1", .start = 0x20, .end = 0x3f },
        	{ .name = "timer", .start = 0x40, .end = 0x5f },
        	{ .name = "keyboard", .start = 0x60, .end = 0x6f },
        	{ .name = "dma page reg", .start = 0x80, .end = 0x8f },
        	{ .name = "pic2", .start = 0xa0, .end = 0xbf },
        	{ .name = "dma2", .start = 0xc0, .end = 0xdf },
	};

	struct resource *io = &ioport_resource;
	size_t i;

	if (hose_head) {
		struct pci_controller *hose;
		for (hose = hose_head; hose; hose = hose->next)
			if (hose->index == 0) {
				io = hose->io_space;
				break;
			}
	}

	/* Fix up for the Jensen's queer RTC placement.  */
	standard_io_resources[0].start = RTC_PORT(0);
	standard_io_resources[0].end = RTC_PORT(0) + 0x10;

	for (i = 0; i < ARRAY_SIZE(standard_io_resources); ++i)
		request_resource(io, standard_io_resources+i);
}

#define PFN_MAX		PFN_DOWN(0x80000000)
#define for_each_mem_cluster(memdesc, cluster, i)		\
	for ((cluster) = (memdesc)->cluster, (i) = 0;		\
	     (i) < (memdesc)->numclusters; (i)++, (cluster)++)

static unsigned long __init
get_mem_size_limit(char *s)
{
        unsigned long end = 0;
        char *from = s;

        end = simple_strtoul(from, &from, 0);
        if ( *from == 'K' || *from == 'k' ) {
                end = end << 10;
                from++;
        } else if ( *from == 'M' || *from == 'm' ) {
                end = end << 20;
                from++;
        } else if ( *from == 'G' || *from == 'g' ) {
                end = end << 30;
                from++;
        }
        return end >> PAGE_SHIFT; /* Return the PFN of the limit. */
}

#ifdef CONFIG_BLK_DEV_INITRD
void * __init
move_initrd(unsigned long mem_limit)
{
	void *start;
	unsigned long size;

	size = initrd_end - initrd_start;
	start = __alloc_bootmem(PAGE_ALIGN(size), PAGE_SIZE, 0);
	if (!start || __pa(start) + size > mem_limit) {
		initrd_start = initrd_end = 0;
		return NULL;
	}
	memmove(start, (void *)initrd_start, size);
	initrd_start = (unsigned long)start;
	initrd_end = initrd_start + size;
	printk("initrd moved to %p\n", s