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

/*
 * Copyright (C) 1999,2001-2002 Silicon Graphics, Inc. All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of version 2 of the GNU General Public License 
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 * 
 * Further, this software is distributed without any warranty that it is 
 * free of the rightful claim of any third person regarding infringement 
 * or the like.  Any license provided herein, whether implied or 
 * otherwise, applies only to this software file.  Patent licenses, if 
 * any, provided herein do not apply to combinations of this program with 
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program; if not, write the Free Software 
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/NoticeExplan
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/kdev_t.h>
#include <linux/string.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/interrupt.h>

#include <asm/io.h>
#include <asm/sal.h>
#include <asm/machvec.h>
#include <asm/system.h>
#ifdef CONFIG_IA64_MCA
#include <asm/acpi-ext.h>
#endif
#include <asm/processor.h>
#include <asm/sn/sgi.h>
#include <asm/sn/io.h>
#include <asm/sn/arch.h>
#include <asm/sn/addrs.h>
#include <asm/sn/pda.h>
#include <asm/sn/nodepda.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/sn_private.h>
#include <asm/sn/simulator.h>
#include <asm/sn/leds.h>
#include <asm/sn/bte.h>
#include <asm/sn/clksupport.h>

#ifdef CONFIG_IA64_SGI_SN2
#include <asm/sn/sn2/shub.h>
#endif

extern void bte_init_node (nodepda_t *, cnodeid_t, char **);
extern void bte_init_cpu (void);

long sn_rtc_cycles_per_second;   

/*
 * This is the address of the RRegs in the HSpace of the global
 * master.  It is used by a hack in serial.c (serial_[in|out],
 * printk.c (early_printk), and kdb_io.c to put console output on that
 * node's Bedrock UART.  It is initialized here to 0, so that
 * early_printk won't try to access the UART before
 * master_node_bedrock_address is properly calculated.
 */
u64 master_node_bedrock_address = 0UL;

static void sn_init_pdas(char **);

extern struct irq_desc *_sn_irq_desc[];

#if defined(CONFIG_IA64_SGI_SN1)
extern synergy_da_t	*Synergy_da_indr[];
#endif

static nodepda_t	*nodepdaindr[MAX_COMPACT_NODES];

#ifdef CONFIG_IA64_SGI_SN2
irqpda_t		*irqpdaindr[NR_CPUS];
#endif /* CONFIG_IA64_SGI_SN2 */


/*
 * 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 sn_screen_info = {
	orig_x:			 0,
	orig_y:			 0,
	orig_video_mode:	 3,
	orig_video_cols:	80,
	orig_video_ega_bx:	 3,
	orig_video_lines:	25,
	orig_video_isVGA:	 1,
	orig_video_points:	16
};

/*
 * This is here so we can use the CMOS detection in ide-probe.c to
 * determine what drives are present.  In theory, we don't need this
 * as the auto-detection could be done via ide-probe.c:do_probe() but
 * in practice that would be much slower, which is painful when
 * running in the simulator.  Note that passing zeroes in DRIVE_INFO
 * is sufficient (the IDE driver will autodetect the drive geometry).
 */
char drive_info[4*16];

/**
 * sn_map_nr - return the mem_map entry for a given kernel address
 * @addr: kernel address to query
 *
 * Finds the mem_map entry for the kernel address given.  Used by
 * virt_to_page() (asm-ia64/page.h), among other things.
 */
unsigned long
sn_map_nr (void *addr)
{
	return MAP_NR_DISCONTIG(addr);
}

/**
 * early_sn_setup - early setup routine for SN platforms
 *
 * Sets up an intial console to aid debugging.  Intended primarily
 * for bringup, it's only called if %BRINGUP and %CONFIG_IA64_EARLY_PRINTK
 * are turned on.  See start_kernel() in init/main.c.
 */
#if defined(CONFIG_IA64_EARLY_PRINTK) && defined(CONFIG_IA64_SGI_SN)
void __init
early_sn_setup(void)
{
	if ( IS_RUNNING_ON_SIMULATOR() ) {
#if defined(CONFIG_IA64_SGI_SN1)
		master_node_bedrock_address = (u64)REMOTE_HSPEC_ADDR(get_nasid(), 0);
#else
		master_node_bedrock_address = (u64)REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
#endif
		printk(KERN_DEBUG "early_sn_setup: setting master_node_bedrock_address to 0x%lx\n", master_node_bedrock_address);
	}
}
#endif /* CONFIG_IA64_EARLY_PRINTK && CONFIG_IA64_SGI_SN */

#ifdef NOT_YET_CONFIG_IA64_MCA
extern void ia64_mca_cpe_int_handler (int cpe_irq, void *arg, struct pt_regs *ptregs);
static struct irqaction mca_cpe_irqaction = { 
	handler:    ia64_mca_cpe_int_handler,
	flags:      SA_INTERRUPT,
	name:       "cpe_hndlr"
};
#endif
#ifdef CONFIG_IA64_MCA
extern int platform_irq_list[];
#endif

extern nasid_t master_nasid;

/**
 * sn_setup - SN platform setup routine
 * @cmdline_p: kernel command line
 *
 * Handles platform setup for SN machines.  This includes determining
 * the RTC frequency (via a SAL call), initializing secondary CPUs, and
 * setting up per-node data areas.  The console is also initialized here.
 */
void __init
sn_setup(char **cmdline_p)
{
	long status, ticks_per_sec, drift;
	int i;

	master_nasid = get_nasid();
	(void)get_console_nasid();

	status = ia64_sal_freq_base(SAL_FREQ_BASE_REALTIME_CLOCK, &ticks_per_sec, &drift);
	if (status != 0 || ticks_per_sec < 100000)
		printk(KERN_WARNING "unable to determine platform RTC clock frequency\n");
	else
		sn_rtc_cycles_per_second = ticks_per_sec;
		
	for (i=0;i<NR_CPUS;i++)
		_sn_irq_desc[i] = _irq_desc;

#ifdef CONFIG_IA64_MCA
	platform_irq_list[ACPI20_ENTRY_PIS_CPEI] = IA64_PCE_VECTOR;
#endif


	if ( IS_RUNNING_ON_SIMULATOR() )
	{
#ifdef CONFIG_IA64_SGI_SN2
		master_node_bedrock_address = (u64)REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
#else
		master_node_bedrock_address = (u64)REMOTE_HSPEC_ADDR(get_nasid(), 0);
#endif
		printk(KERN_DEBUG "sn_setup: setting master_node_bedrock_address to 0x%lx\n",
		       master_node_bedrock_address);
	}

	/*
	 * we set the default root device to /dev/hda
	 * to make simulation easy
	 */
	ROOT_DEV = to_kdev_t(0x0301);

	/*
	 * Create the PDAs and NODEPDAs for all the cpus.
	 */
	sn_init_pdas(cmdline_p);


	/* 
	 * For the bootcpu, we do this here. All other cpus will make the
	 * call as part of cpu_init in slave cpu initialization.
	 */
	sn_cpu_init();


#ifdef CONFIG_SMP
	init_smp_config();
#endif
	screen_info = sn_screen_info;

	/*
	 * Turn off "floating-point assist fault" warnings by default.
	 */
	current->thread.flags |= IA64_THREAD_FPEMU_NOPRINT;
}

/**
 * sn_init_pdas - setup node data areas
 *
 * One time setup for Node Data Area.  Called by sn_setup().
 */
void
sn_init_pdas(char **cmdline_p)
{
	cnodeid_t	cnode;

	/*
	 * Make sure that the PDA fits entirely in the same page as the 
	 * cpu_data area.
	 */
	if ((PDAADDR&~PAGE_MASK)+sizeof(pda_t) > PAGE_SIZE)
		panic("overflow of cpu_data page");

        /*
         * Allocate & initalize the nodepda for each node.
         */
        for (cnode=0; cnode < numnodes; cnode++) {
		nodepdaindr[cnode] = alloc_bootmem_node(NODE_DATA(cnode), sizeof(nodepda_t));
		memset(nodepdaindr[cnode], 0, sizeof(nodepda_t));

#if defined(CONFIG_IA64_SGI_SN1)
		Synergy_da_indr[cnode * 2] = (synergy_da_t *) alloc_bootmem_node(NODE_DATA(cnode), sizeof(synergy_da_t));
		Synergy_da_indr[cnode * 2 + 1] = (synergy_da_t *) alloc_bootmem_node(NODE_DATA(cnode), sizeof(synergy_da_t));
		memset(Synergy_da_indr[cnode * 2], 0, sizeof(synergy_da_t));
		memset(Synergy_da_indr[cnode * 2 + 1], 0, sizeof(synergy_da_t));
#endif
        }

	/*
	 * Now copy the array of nodepda pointers to each nodepda.
	 */
        for (cnode=0; cnode < numnodes; cnode++)
		memcpy(nodepdaindr[cnode]->pernode_pdaindr, nodepdaindr, sizeof(nodepdaindr));


	/*
	 * Set up IO related platform-dependent nodepda fields.
	 * The following routine actually sets up the hubinfo struct
	 * in nodepda.
	 */
	for (cnode = 0; cnode < numnodes; cnode++) {
		init_platform_nodepda(nodepdaindr[cnode], cnode);
		bte_init_node (nodepdaindr[cnode], cnode, cmdline_p);
	}
}

/**
 * sn_cpu_init - initialize per-cpu data areas
 * @cpuid: cpuid of the caller
 *
 * Called during cpu initialization on each cpu as it starts.
 * Currently, initializes the per-cpu data area for SNIA.
 * Also sets up a few fields in the nodepda.  Also known as
 * platform_cpu_init() by the ia64 machvec code.
 */
void __init
sn_cpu_init(void)
{
	int	cpuid;
	int	cpuphyid;
	int	nasid;
	int	slice;
	int	cnode;

	/*
	 * The boot cpu makes this call again after platform initialization is
	 * complete.
	 */
	if (nodepdaindr[0] == NULL)
		return;

	cpuid = smp_processor_id();
	cpuphyid = ((ia64_get_lid() >> 16) & 0xffff);
	nasid = cpu_physical_id_to_nasid(cpuphyid);
	cnode = nasid_to_cnodeid(nasid);
	slice = cpu_physical_id_to_slice(cpuphyid);

	pda.p_nodepda = nodepdaindr[cnode];
	pda.led_address = (long*) (LED0 + (slice<<LED_CPU_SHIFT));
	pda.led_state = 0;
	pda.hb_count = HZ/2;
	pda.hb_state = 0;
	pda.idle_flag = 0;
	
	if (local_node_data->active_cpu_count == 1)
		nodepda->node_first_cpu = cpuid;

#ifdef CONFIG_IA64_SGI_SN1
	{
		int	synergy;
		synergy = cpu_physical_id_to_synergy(cpuphyid);
		pda.p_subnodepda = &nodepdaindr[cnode]->snpda[synergy];
	}
#endif

#ifdef CONFIG_IA64_SGI_SN2

	/*
	 * We must use different memory allocators for first cpu (bootmem 
	 * allocator) than for the other cpus (regular allocator).
	 */
	if (cpuid == 0)
		irqpdaindr[cpuid] = alloc_bootmem_node(NODE_DATA(cpuid_to_cnodeid(cpuid)),sizeof(irqpda_t));
	else
		irqpdaindr[cpuid] = page_address(alloc_pages_node(local_cnodeid(), GFP_KERNEL, get_order(sizeof(irqpda_t))));
	memset(irqpdaindr[cpuid], 0, sizeof(irqpda_t));
	pda.p_irqpda = irqpdaindr[cpuid];
	pda.pio_write_status_addr = (volatile unsigned long *)LOCAL_MMR_ADDR((slice < 2 ? SH_PIO_WRITE_STATUS_0 : SH_PIO_WRITE_STATUS_1 ) );
#endif

#ifdef CONFIG_IA64_SGI_SN1
	pda.bedrock_rev_id = (volatile unsigned long *) LOCAL_HUB(LB_REV_ID);
	if (cpuid_to_synergy(cpuid))
		/* CPU B */
		pda.pio_write_status_addr = (volatile unsigned long *) GBL_PERF_B_ADDR;
	else
		/* CPU A */
		pda.pio_write_status_addr = (volatile unsigned long *) GBL_PERF_A_ADDR;
#endif


	bte_init_cpu();
}


/**
 * cnodeid_to_cpuid - convert a cnode to a cpuid of a cpu on the node.
 * @cnode: node to get a cpuid from
 *	
 * Returns -1 if no cpus exist on the node.
 * NOTE:BRINGUP ZZZ This is NOT a good way to find cpus on the node.
 * Need a better way!!
 */
int
cnodeid_to_cpuid(int cnode) {
	int cpu;

	for (cpu = 0; cpu < smp_num_cpus; cpu++)
		if (cpuid_to_cnodeid(cpu) == cnode)
			break;

	if (cpu == smp_num_cpus) 
		cpu = -1;

	return cpu;
}

#if 0 /* ##jh */
/**
 * get_cycles - return a non-decreasing timestamp
 *
 * On SN, we use an RTC read for this function
 */
cycles_t
get_cycles (void)
{
	return GET_RTC_COUNTER();
}
#endif