setup.c

linux-2.4.29操作系统的源码

/*
 * Copyright (C) 1999,2001-2003 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 <linux/acpi.h>
#include <linux/compiler.h>
#include <linux/sched.h>

#include <asm/io.h>
#include <asm/sal.h>
#include <asm/machvec.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/pgalloc.h>
#include <asm/sn/sgi.h>
#include <asm/sn/io.h>
#include <asm/sn/pci/pciio.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>
#include <asm/sn/sn_sal.h>
#include <asm/sn/sn2/shub.h>

#define pxm_to_nasid(pxm) (((pxm)<<1) | (get_nasid() & ~0x1ff))

#define MAX_PHYS_MEMORY		(1UL << 49)	/* 1 TB */

extern void bte_init_node (nodepda_t *, cnodeid_t);
extern void bte_init_cpu (void);
extern void sn_timer_init(void);
extern unsigned long last_time_offset;
extern void init_platform_hubinfo(nodepda_t **nodepdaindr);
extern void (*ia64_mark_idle)(int);
extern void (*ia64_platform_timer_extras)(void);
extern void sn_timer_interrupt_extras(void);
extern void snidle(int);
extern unsigned char acpi_kbd_controller_present;

unsigned long sn_rtc_cycles_per_second;   

partid_t sn_partid = -1;
char sn_system_serial_number_string[128];
u64 sn_partition_serial_number;

short	physical_node_map[MAX_PHYSNODE_ID];

int	numionodes;
/*
 * 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;

static void sn_init_pdas(char **);


static nodepda_t	*nodepdaindr[MAX_COMPACT_NODES];

irqpda_t		*irqpdaindr;


/*
 * 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).
 */
#ifdef CONFIG_IA64_GENERIC
extern char drive_info[4*16];
#else
char drive_info[4*16];
#endif

/**
 * early_sn_setup - early setup routine for SN platforms
 *
 * Sets up an initial console to aid debugging.  Intended primarily
 * for bringup.  See start_kernel() in init/main.c.
 */
#if defined(CONFIG_IA64_EARLY_PRINTK_SGI_SN) || defined(CONFIG_IA64_SGI_SN_SIM)

void __init
early_sn_setup(void)
{
	void ia64_sal_handler_init (void *entry_point, void *gpval);
	efi_system_table_t			*efi_systab;
	efi_config_table_t 			*config_tables;
	struct ia64_sal_systab			*sal_systab;
	struct ia64_sal_desc_entry_point	*ep;
	char					*p;
	int					i;

	/*
	 * Parse enough of the SAL tables to locate the SAL entry point. Since, console
	 * IO on SN2 is done via SAL calls, early_printk won't work without this.
	 *
	 * This code duplicates some of the ACPI table parsing that is in efi.c & sal.c.
	 * Any changes to those file may have to be made hereas well.
	 */
	efi_systab = (efi_system_table_t*)__va(ia64_boot_param->efi_systab);
	config_tables = __va(efi_systab->tables);
	for (i = 0; i < efi_systab->nr_tables; i++) {
		if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
			sal_systab = __va(config_tables[i].table);
			p = (char*)(sal_systab+1);
			for (i = 0; i < sal_systab->entry_count; i++) {
				if (*p == SAL_DESC_ENTRY_POINT) {
					ep = (struct ia64_sal_desc_entry_point *) p;
					ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
					break;
				}
				p += SAL_DESC_SIZE(*p);
			}
		}
	}

	if ( IS_RUNNING_ON_SIMULATOR() ) {
		master_node_bedrock_address = (u64)REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
		printk(KERN_DEBUG "early_sn_setup: setting master_node_bedrock_address to 0x%lx\n", master_node_bedrock_address);
	}
}
#endif /* CONFIG_IA64_EARLY_PRINTK_SGI_SN */

#ifdef CONFIG_IA64_MCA
extern int platform_intr_list[];
#endif

extern nasid_t master_nasid;
static int shub_1_1_found __initdata;


/*
 * sn_check_for_wars
 *
 * Set flag for enabling shub specific wars
 */

static inline int __init
is_shub_1_1(int nasid)
{
	unsigned long id;
	int	rev;

	id = REMOTE_HUB_L(nasid, SH_SHUB_ID);
	rev =  (id & SH_SHUB_ID_REVISION_MASK) >> SH_SHUB_ID_REVISION_SHFT;
	return rev <= 2;
}

static void __init
sn_check_for_wars(void)
{
	int	cnode;

	for (cnode=0; cnode< numnodes; cnode++)
		if (is_shub_1_1(cnodeid_to_nasid(cnode)))
			shub_1_1_found = 1;
}

/*
 * SN2 requires very slightly different alternate data-TLB miss handle than what
 * the mainline linux kernel provides.  At some point this approach could be used
 * to allow the use of the low-memory thrown away on other platforms when VGA is
 * present.
 *
 * On SN2 we want to load small TCs for granule-0 (and aliases of) faulting
 * addresses.  The details of this are more sublte than at which they first
 * appear.
 */
static void __init
sn2_replace_ivt(void)
{
	extern unsigned char alt_dtlb_miss[], ia64_ivt_page_fault[];
	extern unsigned char sn2_alt_dtlb_miss[], sn2_alt_dtlb_miss_end[];
	extern unsigned char sn2_alt_dtlb_miss_patch1[];

	unsigned char *s, *d;
	u64 *p;
	u64 len = (u64)sn2_alt_dtlb_miss_end - (u64)sn2_alt_dtlb_miss;
	u64 broffs = (ia64_ivt_page_fault - alt_dtlb_miss) - (sn2_alt_dtlb_miss_patch1 - sn2_alt_dtlb_miss);
	u64 psr;
	int i;

	/* printk(KERN_DEBUG "Replacing alternate data-TLB miss handler.\n"); */

	/* Check the code isn't too large */
	if (len > 1024) {
		printk(KERN_ERR "SGI: Specific alt_dtlb_misse too large!  Not replacing\n");
		return;
	}

	/* check the offset is sane (should always be) */
	if ((broffs>>4) + (1<<20) >= (1<<21)) {
		printk(KERN_ERR "SGI: IVT patch ivt offset %ld invalid!   Not replacing!\n", broffs);
		return;
	}

	/* 2nd half of bundle to patch (has slot 2) */
	p = (u64*)sn2_alt_dtlb_miss_patch1 + 1;
	/* patch the offset into slot 2 (imm20b + s) */
	*p = (*p & ~(0x8fffff000000000)) | ((broffs & 0x1000000) << 35) | ((broffs & 0x0fffff0) << 32);

	/* don't want any interrupts when doing this */
	psr = ia64_clear_ic();

	/* copy over the existing code, flush i-cache as required */
	d = alt_dtlb_miss;
	s = sn2_alt_dtlb_miss;
	for (i=0; i<len; ++i, ++s) {
		*d++ = *s;
		if ((((u64)s) & 63) == 63) {
			ia64_insn_group_barrier();
			ia64_fc((void*)s);
		}
	}
	ia64_insn_group_barrier();
	ia64_fc((void*)s);

	/* sync & serialize instruction stream */
	ia64_sync_i();
	ia64_srlz_i();

	/* restore interrupt status */
	ia64_set_psr(psr);

	/* flush any TC's we have had previously loaded that could cause problems here */
	local_flush_tlb_all();

	printk(KERN_DEBUG "SGI: Replaced alt_dtlb_miss handler.\n");
}

/**
 * sn_setup - SN platform setup routine