arch/sparc64/kernel/setup.c - maze/linux - Git at Google

 /*  $Id: setup.c,v 1.72 2002/02/09 19:49:30 davem Exp $
  *  linux/arch/sparc64/kernel/setup.c
  *
  *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
  *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  */

 #include <linux/errno.h>
 #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 <asm/smp.h>
 #include <linux/user.h>
 #include <linux/screen_info.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
 #include <linux/syscalls.h>
 #include <linux/kdev_t.h>
 #include <linux/major.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/inet.h>
 #include <linux/console.h>
 #include <linux/root_dev.h>
 #include <linux/interrupt.h>
 #include <linux/cpu.h>
 #include <linux/initrd.h>

 #include <asm/system.h>
 #include <asm/io.h>
 #include <asm/processor.h>
 #include <asm/oplib.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/idprom.h>
 #include <asm/head.h>
 #include <asm/starfire.h>
 #include <asm/mmu_context.h>
 #include <asm/timer.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/mmu.h>
 #include <asm/ns87303.h>

 #ifdef CONFIG_IP_PNP
 #include <net/ipconfig.h>
 #endif

 #include "entry.h"

 /* Used to synchronize accesses to NatSemi SUPER I/O chip configure
  * operations in asm/ns87303.h
  */
 DEFINE_SPINLOCK(ns87303_lock);

 struct screen_info screen_info = {
 	0, 0,			/* orig-x, orig-y */
 	0,			/* unused */
 	0,			/* orig-video-page */
 	0,			/* orig-video-mode */
 	128,			/* orig-video-cols */
 	0, 0, 0,		/* unused, ega_bx, unused */
 	54,			/* orig-video-lines */
 	0,                      /* orig-video-isVGA */
 	16                      /* orig-video-points */
 };

 static void
 prom_console_write(struct console *con, const char *s, unsigned n)
 {
 	prom_write(s, n);
 }

 /* Exported for mm/init.c:paging_init. */
 unsigned long cmdline_memory_size = 0;

 static struct console prom_early_console = {
 	.name =		"earlyprom",
 	.write =	prom_console_write,
 	.flags =	CON_PRINTBUFFER | CON_BOOT,
 	.index =	-1,
 };

 /*
  * Process kernel command line switches that are specific to the
  * SPARC or that require special low-level processing.
  */
 static void __init process_switch(char c)
 {
 	switch (c) {
 	case 'd':
 	case 's':
 		break;
 	case 'h':
 		prom_printf("boot_flags_init: Halt!\n");
 		prom_halt();
 		break;
 	case 'p':
 		/* Just ignore, this behavior is now the default.  */
 		break;
 	case 'P':
 		/* Force UltraSPARC-III P-Cache on. */
 		if (tlb_type != cheetah) {
 			printk("BOOT: Ignoring P-Cache force option.\n");
 			break;
 		}
 		cheetah_pcache_forced_on = 1;
 		add_taint(TAINT_MACHINE_CHECK);
 		cheetah_enable_pcache();
 		break;

 	default:
 		printk("Unknown boot switch (-%c)\n", c);
 		break;
 	}
 }

 static void __init boot_flags_init(char *commands)
 {
 	while (*commands) {
 		/* Move to the start of the next "argument". */
 		while (*commands && *commands == ' ')
 			commands++;

 		/* Process any command switches, otherwise skip it. */
 		if (*commands == '\0')
 			break;
 		if (*commands == '-') {
 			commands++;
 			while (*commands && *commands != ' ')
 				process_switch(*commands++);
 			continue;
 		}
 		if (!strncmp(commands, "mem=", 4)) {
 			/*
 			 * "mem=XXX[kKmM]" overrides the PROM-reported
 			 * memory size.
 			 */
 			cmdline_memory_size = simple_strtoul(commands + 4,
 							     &commands, 0);
 			if (*commands == 'K' || *commands == 'k') {
 				cmdline_memory_size <<= 10;
 				commands++;
 			} else if (*commands=='M' || *commands=='m') {
 				cmdline_memory_size <<= 20;
 				commands++;
 			}
 		}
 		while (*commands && *commands != ' ')
 			commands++;
 	}
 }

 extern unsigned short root_flags;
 extern unsigned short root_dev;
 extern unsigned short ram_flags;
 #define RAMDISK_IMAGE_START_MASK	0x07FF
 #define RAMDISK_PROMPT_FLAG		0x8000
 #define RAMDISK_LOAD_FLAG		0x4000

 extern int root_mountflags;

 char reboot_command[COMMAND_LINE_SIZE];

 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

 void __init per_cpu_patch(void)
 {
 	struct cpuid_patch_entry *p;
 	unsigned long ver;
 	int is_jbus;

 	if (tlb_type == spitfire && !this_is_starfire)
 		return;

 	is_jbus = 0;
 	if (tlb_type != hypervisor) {
 		__asm__ ("rdpr %%ver, %0" : "=r" (ver));
 		is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
 			   (ver >> 32UL) == __SERRANO_ID);
 	}

 	p = &__cpuid_patch;
 	while (p < &__cpuid_patch_end) {
 		unsigned long addr = p->addr;
 		unsigned int *insns;

 		switch (tlb_type) {
 		case spitfire:
 			insns = &p->starfire[0];
 			break;
 		case cheetah:
 		case cheetah_plus:
 			if (is_jbus)
 				insns = &p->cheetah_jbus[0];
 			else
 				insns = &p->cheetah_safari[0];
 			break;
 		case hypervisor:
 			insns = &p->sun4v[0];
 			break;
 		default:
 			prom_printf("Unknown cpu type, halting.\n");
 			prom_halt();
 		};

 		*(unsigned int *) (addr +  0) = insns[0];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		*(unsigned int *) (addr +  4) = insns[1];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  4));

 		*(unsigned int *) (addr +  8) = insns[2];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  8));

 		*(unsigned int *) (addr + 12) = insns[3];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr + 12));

 		p++;
 	}
 }

 void __init sun4v_patch(void)
 {
 	extern void sun4v_hvapi_init(void);
 	struct sun4v_1insn_patch_entry *p1;
 	struct sun4v_2insn_patch_entry *p2;

 	if (tlb_type != hypervisor)
 		return;

 	p1 = &__sun4v_1insn_patch;
 	while (p1 < &__sun4v_1insn_patch_end) {
 		unsigned long addr = p1->addr;

 		*(unsigned int *) (addr +  0) = p1->insn;
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		p1++;
 	}

 	p2 = &__sun4v_2insn_patch;
 	while (p2 < &__sun4v_2insn_patch_end) {
 		unsigned long addr = p2->addr;

 		*(unsigned int *) (addr +  0) = p2->insns[0];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		*(unsigned int *) (addr +  4) = p2->insns[1];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  4));

 		p2++;
 	}

 	sun4v_hvapi_init();
 }

 #ifdef CONFIG_SMP
 void __init boot_cpu_id_too_large(int cpu)
 {
 	prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
 		    cpu, NR_CPUS);
 	prom_halt();
 }
 #endif

 void __init setup_arch(char **cmdline_p)
 {
 	/* Initialize PROM console and command line. */
 	*cmdline_p = prom_getbootargs();
 	strcpy(boot_command_line, *cmdline_p);

 	boot_flags_init(*cmdline_p);
 	register_console(&prom_early_console);

 	if (tlb_type == hypervisor)
 		printk("ARCH: SUN4V\n");
 	else
 		printk("ARCH: SUN4U\n");

 #ifdef CONFIG_DUMMY_CONSOLE
 	conswitchp = &dummy_con;
 #elif defined(CONFIG_PROM_CONSOLE)
 	conswitchp = &prom_con;
 #endif

 	idprom_init();

 	if (!root_flags)
 		root_mountflags &= ~MS_RDONLY;
 	ROOT_DEV = old_decode_dev(root_dev);
 #ifdef CONFIG_BLK_DEV_RAM
 	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 #endif

 	task_thread_info(&init_task)->kregs = &fake_swapper_regs;

 #ifdef CONFIG_IP_PNP
 	if (!ic_set_manually) {
 		int chosen = prom_finddevice ("/chosen");
 		u32 cl, sv, gw;

 		cl = prom_getintdefault (chosen, "client-ip", 0);
 		sv = prom_getintdefault (chosen, "server-ip", 0);
 		gw = prom_getintdefault (chosen, "gateway-ip", 0);
 		if (cl && sv) {
 			ic_myaddr = cl;
 			ic_servaddr = sv;
 			if (gw)
 				ic_gateway = gw;
 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 			ic_proto_enabled = 0;
 #endif
 		}
 	}
 #endif

 	/* Get boot processor trap_block[] setup.  */
 	init_cur_cpu_trap(current_thread_info());

 	paging_init();
 }

 /* BUFFER is PAGE_SIZE bytes long. */

 extern void smp_info(struct seq_file *);
 extern void smp_bogo(struct seq_file *);
 extern void mmu_info(struct seq_file *);

 unsigned int dcache_parity_tl1_occurred;
 unsigned int icache_parity_tl1_occurred;

 int ncpus_probed;

 static int show_cpuinfo(struct seq_file *m, void *__unused)
 {
 	seq_printf(m,
 		   "cpu\t\t: %s\n"
 		   "fpu\t\t: %s\n"
 		   "prom\t\t: %s\n"
 		   "type\t\t: %s\n"
 		   "ncpus probed\t: %d\n"
 		   "ncpus active\t: %d\n"
 		   "D$ parity tl1\t: %u\n"
 		   "I$ parity tl1\t: %u\n"
 #ifndef CONFIG_SMP
 		   "Cpu0ClkTck\t: %016lx\n"
 #endif
 		   ,
 		   sparc_cpu_type,
 		   sparc_fpu_type,
 		   prom_version,
 		   ((tlb_type == hypervisor) ?
 		    "sun4v" :
 		    "sun4u"),
 		   ncpus_probed,
 		   num_online_cpus(),
 		   dcache_parity_tl1_occurred,
 		   icache_parity_tl1_occurred
 #ifndef CONFIG_SMP
 		   , cpu_data(0).clock_tick
 #endif
 		);
 #ifdef CONFIG_SMP
 	smp_bogo(m);
 #endif
 	mmu_info(m);
 #ifdef CONFIG_SMP
 	smp_info(m);
 #endif
 	return 0;
 }

 static void *c_start(struct seq_file *m, loff_t *pos)
 {
 	/* The pointer we are returning is arbitrary,
 	 * it just has to be non-NULL and not IS_ERR
 	 * in the success case.
 	 */
 	return *pos == 0 ? &c_start : 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)
 {
 }

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

 extern int stop_a_enabled;

 void sun_do_break(void)
 {
 	if (!stop_a_enabled)
 		return;

 	prom_printf("\n");
 	flush_user_windows();

 	prom_cmdline();
 }

 int stop_a_enabled = 1;
	/* $Id: setup.c,v 1.72 2002/02/09 19:49:30 davem Exp $
	* linux/arch/sparc64/kernel/setup.c
	*
	* Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
	* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	*/

	#include <linux/errno.h>
	#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 <asm/smp.h>
	#include <linux/user.h>
	#include <linux/screen_info.h>
	#include <linux/delay.h>
	#include <linux/fs.h>
	#include <linux/seq_file.h>
	#include <linux/syscalls.h>
	#include <linux/kdev_t.h>
	#include <linux/major.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/inet.h>
	#include <linux/console.h>
	#include <linux/root_dev.h>
	#include <linux/interrupt.h>
	#include <linux/cpu.h>
	#include <linux/initrd.h>

	#include <asm/system.h>
	#include <asm/io.h>
	#include <asm/processor.h>
	#include <asm/oplib.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/idprom.h>
	#include <asm/head.h>
	#include <asm/starfire.h>
	#include <asm/mmu_context.h>
	#include <asm/timer.h>
	#include <asm/sections.h>
	#include <asm/setup.h>
	#include <asm/mmu.h>
	#include <asm/ns87303.h>

	#ifdef CONFIG_IP_PNP
	#include <net/ipconfig.h>
	#endif

	#include "entry.h"

	/* Used to synchronize accesses to NatSemi SUPER I/O chip configure
	* operations in asm/ns87303.h
	*/
	DEFINE_SPINLOCK(ns87303_lock);

	struct screen_info screen_info = {
	0, 0, /* orig-x, orig-y */
	0, /* unused */
	0, /* orig-video-page */
	0, /* orig-video-mode */
	128, /* orig-video-cols */
	0, 0, 0, /* unused, ega_bx, unused */
	54, /* orig-video-lines */
	0, /* orig-video-isVGA */
	16 /* orig-video-points */
	};

	static void
	prom_console_write(struct console con, const char s, unsigned n)
	{
	prom_write(s, n);
	}

	/* Exported for mm/init.c:paging_init. */
	unsigned long cmdline_memory_size = 0;

	static struct console prom_early_console = {
	.name = "earlyprom",
	.write = prom_console_write,
	.flags = CON_PRINTBUFFER \| CON_BOOT,
	.index = -1,
	};

	/*
	* Process kernel command line switches that are specific to the
	* SPARC or that require special low-level processing.
	*/
	static void __init process_switch(char c)
	{
	switch (c) {
	case 'd':
	case 's':
	break;
	case 'h':
	prom_printf("boot_flags_init: Halt!\n");
	prom_halt();
	break;
	case 'p':
	/* Just ignore, this behavior is now the default. */
	break;
	case 'P':
	/* Force UltraSPARC-III P-Cache on. */
	if (tlb_type != cheetah) {
	printk("BOOT: Ignoring P-Cache force option.\n");
	break;
	}
	cheetah_pcache_forced_on = 1;
	add_taint(TAINT_MACHINE_CHECK);
	cheetah_enable_pcache();
	break;

	default:
	printk("Unknown boot switch (-%c)\n", c);
	break;
	}
	}

	static void __init boot_flags_init(char *commands)
	{
	while (*commands) {
	/* Move to the start of the next "argument". */
	while (commands && commands == ' ')
	commands++;

	/* Process any command switches, otherwise skip it. */
	if (*commands == '\0')
	break;
	if (*commands == '-') {
	commands++;
	while (commands && commands != ' ')
	process_switch(*commands++);
	continue;
	}
	if (!strncmp(commands, "mem=", 4)) {
	/*
	* "mem=XXX[kKmM]" overrides the PROM-reported
	* memory size.
	*/
	cmdline_memory_size = simple_strtoul(commands + 4,
	&commands, 0);
	if (commands == 'K' \|\| commands == 'k') {
	cmdline_memory_size <<= 10;
	commands++;
	} else if (commands=='M' \|\| commands=='m') {
	cmdline_memory_size <<= 20;
	commands++;
	}
	}
	while (commands && commands != ' ')
	commands++;
	}
	}

	extern unsigned short root_flags;
	extern unsigned short root_dev;
	extern unsigned short ram_flags;
	#define RAMDISK_IMAGE_START_MASK 0x07FF
	#define RAMDISK_PROMPT_FLAG 0x8000
	#define RAMDISK_LOAD_FLAG 0x4000

	extern int root_mountflags;

	char reboot_command[COMMAND_LINE_SIZE];

	static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

	void __init per_cpu_patch(void)
	{
	struct cpuid_patch_entry *p;
	unsigned long ver;
	int is_jbus;

	if (tlb_type == spitfire && !this_is_starfire)
	return;

	is_jbus = 0;
	if (tlb_type != hypervisor) {
	__asm__ ("rdpr %%ver, %0" : "=r" (ver));
	is_jbus = ((ver >> 32UL) == __JALAPENO_ID \|\|
	(ver >> 32UL) == __SERRANO_ID);
	}

	p = &__cpuid_patch;
	while (p < &__cpuid_patch_end) {
	unsigned long addr = p->addr;
	unsigned int *insns;

	switch (tlb_type) {
	case spitfire:
	insns = &p->starfire[0];
	break;
	case cheetah:
	case cheetah_plus:
	if (is_jbus)
	insns = &p->cheetah_jbus[0];
	else
	insns = &p->cheetah_safari[0];
	break;
	case hypervisor:
	insns = &p->sun4v[0];
	break;
	default:
	prom_printf("Unknown cpu type, halting.\n");
	prom_halt();
	};

	(unsigned int ) (addr + 0) = insns[0];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	(unsigned int ) (addr + 4) = insns[1];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 4));

	(unsigned int ) (addr + 8) = insns[2];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 8));

	(unsigned int ) (addr + 12) = insns[3];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 12));

	p++;
	}
	}

	void __init sun4v_patch(void)
	{
	extern void sun4v_hvapi_init(void);
	struct sun4v_1insn_patch_entry *p1;
	struct sun4v_2insn_patch_entry *p2;

	if (tlb_type != hypervisor)
	return;

	p1 = &__sun4v_1insn_patch;
	while (p1 < &__sun4v_1insn_patch_end) {
	unsigned long addr = p1->addr;

	(unsigned int ) (addr + 0) = p1->insn;
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	p1++;
	}

	p2 = &__sun4v_2insn_patch;
	while (p2 < &__sun4v_2insn_patch_end) {
	unsigned long addr = p2->addr;

	(unsigned int ) (addr + 0) = p2->insns[0];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	(unsigned int ) (addr + 4) = p2->insns[1];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 4));

	p2++;
	}

	sun4v_hvapi_init();
	}

	#ifdef CONFIG_SMP
	void __init boot_cpu_id_too_large(int cpu)
	{
	prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
	cpu, NR_CPUS);
	prom_halt();
	}
	#endif

	void __init setup_arch(char **cmdline_p)
	{
	/* Initialize PROM console and command line. */
	*cmdline_p = prom_getbootargs();
	strcpy(boot_command_line, *cmdline_p);

	boot_flags_init(*cmdline_p);
	register_console(&prom_early_console);

	if (tlb_type == hypervisor)
	printk("ARCH: SUN4V\n");
	else
	printk("ARCH: SUN4U\n");

	#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
	#elif defined(CONFIG_PROM_CONSOLE)
	conswitchp = &prom_con;
	#endif

	idprom_init();

	if (!root_flags)
	root_mountflags &= ~MS_RDONLY;
	ROOT_DEV = old_decode_dev(root_dev);
	#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
	#endif

	task_thread_info(&init_task)->kregs = &fake_swapper_regs;

	#ifdef CONFIG_IP_PNP
	if (!ic_set_manually) {
	int chosen = prom_finddevice ("/chosen");
	u32 cl, sv, gw;

	cl = prom_getintdefault (chosen, "client-ip", 0);
	sv = prom_getintdefault (chosen, "server-ip", 0);
	gw = prom_getintdefault (chosen, "gateway-ip", 0);
	if (cl && sv) {
	ic_myaddr = cl;
	ic_servaddr = sv;
	if (gw)
	ic_gateway = gw;
	#if defined(CONFIG_IP_PNP_BOOTP) \|\| defined(CONFIG_IP_PNP_RARP)
	ic_proto_enabled = 0;
	#endif
	}
	}
	#endif

	/* Get boot processor trap_block[] setup. */
	init_cur_cpu_trap(current_thread_info());

	paging_init();
	}

	/* BUFFER is PAGE_SIZE bytes long. */

	extern void smp_info(struct seq_file *);
	extern void smp_bogo(struct seq_file *);
	extern void mmu_info(struct seq_file *);

	unsigned int dcache_parity_tl1_occurred;
	unsigned int icache_parity_tl1_occurred;

	int ncpus_probed;

	static int show_cpuinfo(struct seq_file m, void __unused)
	{
	seq_printf(m,
	"cpu\t\t: %s\n"
	"fpu\t\t: %s\n"
	"prom\t\t: %s\n"
	"type\t\t: %s\n"
	"ncpus probed\t: %d\n"
	"ncpus active\t: %d\n"
	"D$ parity tl1\t: %u\n"
	"I$ parity tl1\t: %u\n"
	#ifndef CONFIG_SMP
	"Cpu0ClkTck\t: %016lx\n"
	#endif
	,
	sparc_cpu_type,
	sparc_fpu_type,
	prom_version,
	((tlb_type == hypervisor) ?
	"sun4v" :
	"sun4u"),
	ncpus_probed,
	num_online_cpus(),
	dcache_parity_tl1_occurred,
	icache_parity_tl1_occurred
	#ifndef CONFIG_SMP
	, cpu_data(0).clock_tick
	#endif
	);
	#ifdef CONFIG_SMP
	smp_bogo(m);
	#endif
	mmu_info(m);
	#ifdef CONFIG_SMP
	smp_info(m);
	#endif
	return 0;
	}

	static void c_start(struct seq_file m, loff_t *pos)
	{
	/* The pointer we are returning is arbitrary,
	* it just has to be non-NULL and not IS_ERR
	* in the success case.
	*/
	return *pos == 0 ? &c_start : 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)
	{
	}

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

	extern int stop_a_enabled;

	void sun_do_break(void)
	{
	if (!stop_a_enabled)
	return;

	prom_printf("\n");
	flush_user_windows();

	prom_cmdline();
	}

	int stop_a_enabled = 1;