setup.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*    $Id: setup.c,v 1.8 2000/02/02 04:42:38 prumpf Exp $
 *
 *    Initial setup-routines for HP 9000 based hardware.
 *
 *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *    Modifications for PA-RISC (C) 1999 Helge Deller <[e-mail]>
 *    Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
 *    Modifications copyright 2000 Martin K. Petersen <[e-mail]>
 *    Modifications copyright 2000 Philipp Rumpf <[e-mail]>
 *    Modifications copyright 2001 Ryan Bradetich <[e-mail]>
 *
 *    Initial PA-RISC Version: 04-23-1999 by Helge Deller
 *
 *    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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/blk.h>          /* for initrd_start and initrd_end */
#include <linux/init.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#define PCI_DEBUG
#include <linux/pci.h>
#undef PCI_DEBUG
#include <linux/proc_fs.h>

#include <asm/processor.h>
#include <asm/pdc.h>
#include <asm/led.h>
#include <asm/machdep.h>	/* for pa7300lc_init() proto */

#define COMMAND_LINE_SIZE 1024
char	saved_command_line[COMMAND_LINE_SIZE];
char	command_line[COMMAND_LINE_SIZE];

/* Intended for ccio/sba/cpu statistics under /proc/bus/{runway|gsc} */
struct proc_dir_entry * proc_runway_root = NULL;
struct proc_dir_entry * proc_gsc_root = NULL;

#ifdef CONFIG_EISA
int EISA_bus;	/* This has to go somewhere in architecture specific code. */
#endif

void __init setup_cmdline(char **cmdline_p)
{
	extern unsigned int boot_args[];

	/* Collect stuff passed in from the boot loader */

	/* boot_args[0] is free-mem start, boot_args[1] is ptr to command line */
	if (boot_args[0] < 64) {
		/* called from hpux boot loader */
		saved_command_line[0] = '\0';
	} else {
		strcpy(saved_command_line, (char *)__va(boot_args[1]));

#ifdef CONFIG_BLK_DEV_INITRD
		if (boot_args[2] != 0) /* did palo pass us a ramdisk? */
		{
		    initrd_start = (unsigned long)__va(boot_args[2]);
		    initrd_end = (unsigned long)__va(boot_args[3]);
		}
#endif
	}

	strcpy(command_line, saved_command_line);
	*cmdline_p = command_line;
}

#ifdef CONFIG_PA11
void __init dma_ops_init(void)
{
	switch (boot_cpu_data.cpu_type) {
	case pcx:
		/*
		 * We've got way too many dependencies on 1.1 semantics
		 * to support 1.0 boxes at this point.
		 */
		panic(	"PA-RISC Linux currently only supports machines that conform to\n"
			"the PA-RISC 1.1 or 2.0 architecture specification.\n");

	case pcxs:
	case pcxt:
		hppa_dma_ops = &pcx_dma_ops;
		break;
	case pcxl2:
		pa7300lc_init();
	case pcxl: /* falls through */
		hppa_dma_ops = &pcxl_dma_ops;
		break;
	default:
		break;
	}
}
#endif

extern int init_per_cpu(int cpuid);
extern void collect_boot_cpu_data(void);

void __init setup_arch(char **cmdline_p)
{
	init_per_cpu(smp_processor_id());	/* Set Modes & Enable FP */

#ifdef __LP64__
	printk(KERN_INFO "The 64-bit Kernel has started...\n");
#else
	printk(KERN_INFO "The 32-bit Kernel has started...\n");
#endif

	pdc_console_init();

#ifdef CONFIG_PDC_NARROW
	printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
#endif
	setup_pdc();
	setup_cmdline(cmdline_p);
	collect_boot_cpu_data();
	do_memory_inventory();  /* probe for physical memory */
	cache_init();
	paging_init();

#ifdef CONFIG_CHASSIS_LCD_LED
	/* initialize the LCD/LED after boot_cpu_data is available ! */
        led_init();				/* LCD/LED initialization */
#endif

#ifdef CONFIG_PA11
	dma_ops_init();
#endif

#ifdef CONFIG_VT
# if defined(CONFIG_STI_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
        conswitchp = &dummy_con;        /* we use take_over_console() later ! */
# endif
#endif

}

/*
 * Display cpu info for all cpu's.
 * for parisc this is in processor.c
 */
extern int show_cpuinfo (struct seq_file *m, void *v);

static void *
c_start (struct seq_file *m, loff_t *pos)
{
    	/* Looks like the caller will call repeatedly until we return
	 * 0, signaling EOF perhaps.  This could be used to sequence
	 * through CPUs for example.  Since we print all cpu info in our
	 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above)
	 * we only allow for one "position".  */
	return ((long)*pos < 1) ? (void *)1 : NULL;
}

static void *
c_next (struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void
c_stop (struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	start:	c_start,
	next:	c_next,
	stop:	c_stop,
	show:	show_cpuinfo
};

static void parisc_proc_mkdir(void)
{
	/*
	** Can't call proc_mkdir() until after proc_root_init() has been
	** called by start_kernel(). In other words, this code can't
	** live in arch/.../setup.c because start_parisc() calls
	** start_kernel().
	*/
	switch (boot_cpu_data.cpu_type) {
	case pcxl:
	case pcxl2:
		if (NULL == proc_gsc_root)
		{
			proc_gsc_root = proc_mkdir("bus/gsc", 0);
		}
		break;
        case pcxt_:
        case pcxu:
        case pcxu_:
        case pcxw:
        case pcxw_:
        case pcxw2:
                if (NULL == proc_runway_root)
                {
                        proc_runway_root = proc_mkdir("bus/runway", 0);
                }
                break;
	}
}

static struct resource central_bus = {
	name:	"Central Bus",
	start:	(unsigned long)0xfffffffffff80000,
	end:    (unsigned long)0xfffffffffffaffff,
	flags:	IORESOURCE_MEM,
};

static struct resource local_broadcast = {
	name:	"Local Broadcast",
	start:	(unsigned long)0xfffffffffffb0000,
	end:	(unsigned long)0xfffffffffffdffff,
	flags:	IORESOURCE_MEM,
};

static struct resource global_broadcast = {
	name:	"Global Broadcast",
	start:	(unsigned long)0xfffffffffffe0000,
	end:	(unsigned long)0xffffffffffffffff,
	flags:	IORESOURCE_MEM,
};

int __init parisc_init_resources(void)
{
	int result;

	result = request_resource(&iomem_resource, &central_bus);
	if (result < 0) {
		printk(KERN_ERR 
		       "%s: failed to claim %s address space!\n", 
		       __FILE__, central_bus.name);
		return result;
	}

	result = request_resource(&iomem_resource, &local_broadcast);
	if (result < 0) {
		printk(KERN_ERR 
		       "%s: failed to claim %saddress space!\n", 
		       __FILE__, local_broadcast.name);
		return result;
	}

	result = request_resource(&iomem_resource, &global_broadcast);
	if (result < 0) {
		printk(KERN_ERR 
		       "%s: failed to claim %s address space!\n", 
		       __FILE__, global_broadcast.name);
		return result;
	}

	return 0;
}

extern void gsc_init(void);
extern void processor_init(void);
extern void ccio_init(void);
extern void dino_init(void);
extern void iosapic_init(void);
extern void lba_init(void);
extern void sba_init(void);
extern void eisa_init(void);

void __init parisc_init(void)
{
	parisc_proc_mkdir();
	parisc_init_resources();
	do_device_inventory();                  /* probe for hardware */

	processor_init();
	printk(KERN_INFO "CPU(s): %d x %s at %d.%06d MHz\n",
			boot_cpu_data.cpu_count,
			boot_cpu_data.cpu_name,
			boot_cpu_data.cpu_hz / 1000000,
			boot_cpu_data.cpu_hz % 1000000	);

	/* These are in a non-obvious order, will fix when we have an iotree */
#if defined(CONFIG_IOSAPIC)
	iosapic_init();
#endif
#if defined(CONFIG_IOMMU_SBA)
	sba_init();
#endif
#if defined(CONFIG_PCI_LBA)
	lba_init();
#endif

	/* CCIO before any potential subdevices */
#if defined(CONFIG_IOMMU_CCIO)
	ccio_init();
#endif

	/*
	 * Need to register Asp & Wax before the EISA adapters for the IRQ
	 * regions.  EISA must come before PCI to be sure it gets IRQ region
	 * 0.
	 */
#if defined(CONFIG_GSC_LASI) || defined(CONFIG_GSC_WAX)
	gsc_init();
#endif
#ifdef CONFIG_EISA
	eisa_init();
#endif
#if defined(CONFIG_GSC_DINO)
	dino_init();
#endif

#ifdef CONFIG_CHASSIS_LCD_LED
	register_led_regions();	/* register LED port info in procfs */
#endif
}