[PATCH] core voyager arch/i386/machine support

arch/i386/mach-voyager/Makefile

+#
+# Makefile for the linux kernel.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definitions are now in the main makefile...
+
+EXTRA_CFLAGS	+= -I../kernel
+export-objs	:=
+
+obj-y			:= setup.o voyager_basic.o voyager_thread.o
+
+obj-$(CONFIG_SMP)	+= voyager_smp.o voyager_cat.o
+
+include $(TOPDIR)/Rules.make

arch/i386/mach-voyager/do_timer.h

+/* defines for inline arch setup functions */
+#include <asm/voyager.h>
+
+static inline void do_timer_interrupt_hook(struct pt_regs *regs)
+{
+	do_timer(regs);
+
+	voyager_timer_interrupt(regs);
+}
+
+static inline int do_timer_overflow(int count)
+{
+	/* can't read the ISR, just assume 1 tick
+	   overflow */
+	if(count > LATCH || count < 0) {
+		printk(KERN_ERR "VOYAGER PROBLEM: count is %d, latch is %d\n", count, LATCH);
+		count = LATCH;
+	}
+	count -= LATCH;
+
+	return count;
+}

arch/i386/mach-voyager/entry_arch.h

+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* Copyright (C) 2002
+ *
+ * Author: James.Bottomley@HansenPartnership.com
+ *
+ * linux/arch/i386/voyager/entry_arch.h
+ *
+ * This file builds the VIC and QIC CPI gates
+ */
+
+/* initialise the voyager interrupt gates 
+ *
+ * This uses the macros in irq.h to set up assembly jump gates.  The
+ * calls are then redirected to the same routine with smp_ prefixed */
+BUILD_INTERRUPT(vic_sys_interrupt, VIC_SYS_INT)
+BUILD_INTERRUPT(vic_cmn_interrupt, VIC_CMN_INT)
+BUILD_INTERRUPT(vic_cpi_interrupt, VIC_CPI_LEVEL0);
+
+/* do all the QIC interrupts */
+BUILD_INTERRUPT(qic_timer_interrupt, QIC_TIMER_CPI);
+BUILD_INTERRUPT(qic_invalidate_interrupt, QIC_INVALIDATE_CPI);
+BUILD_INTERRUPT(qic_reschedule_interrupt, QIC_RESCHEDULE_CPI);
+BUILD_INTERRUPT(qic_enable_irq_interrupt, QIC_ENABLE_IRQ_CPI);
+BUILD_INTERRUPT(qic_call_function_interrupt, QIC_CALL_FUNCTION_CPI);
+

arch/i386/mach-voyager/irq_vectors.h

+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* Copyright (C) 2002
+ *
+ * Author: James.Bottomley@HansenPartnership.com
+ *
+ * linux/arch/i386/voyager/irq_vectors.h
+ *
+ * This file provides definitions for the VIC and QIC CPIs
+ */
+
+#ifndef _ASM_IRQ_VECTORS_H
+#define _ASM_IRQ_VECTORS_H
+
+/*
+ * IDT vectors usable for external interrupt sources start
+ * at 0x20:
+ */
+#define FIRST_EXTERNAL_VECTOR	0x20
+
+#define SYSCALL_VECTOR		0x80
+
+/*
+ * Vectors 0x20-0x2f are used for ISA interrupts.
+ */
+
+/* These define the CPIs we use in linux */
+#define VIC_CPI_LEVEL0			0
+#define VIC_CPI_LEVEL1			1
+/* now the fake CPIs */
+#define VIC_TIMER_CPI			2
+#define VIC_INVALIDATE_CPI		3
+#define VIC_RESCHEDULE_CPI		4
+#define VIC_ENABLE_IRQ_CPI		5
+#define VIC_CALL_FUNCTION_CPI		6
+
+/* Now the QIC CPIs:  Since we don't need the two initial levels,
+ * these are 2 less than the VIC CPIs */
+#define QIC_CPI_OFFSET			1
+#define QIC_TIMER_CPI			(VIC_TIMER_CPI - QIC_CPI_OFFSET)
+#define QIC_INVALIDATE_CPI		(VIC_INVALIDATE_CPI - QIC_CPI_OFFSET)
+#define QIC_RESCHEDULE_CPI		(VIC_RESCHEDULE_CPI - QIC_CPI_OFFSET)
+#define QIC_ENABLE_IRQ_CPI		(VIC_ENABLE_IRQ_CPI - QIC_CPI_OFFSET)
+#define QIC_CALL_FUNCTION_CPI		(VIC_CALL_FUNCTION_CPI - QIC_CPI_OFFSET)
+
+#define VIC_START_FAKE_CPI		VIC_TIMER_CPI
+#define VIC_END_FAKE_CPI		VIC_CALL_FUNCTION_CPI
+
+/* this is the SYS_INT CPI. */
+#define VIC_SYS_INT			8
+#define VIC_CMN_INT			15
+
+/* This is the boot CPI for alternate processors.  It gets overwritten
+ * by the above once the system has activated all available processors */
+#define VIC_CPU_BOOT_CPI		VIC_CPI_LEVEL0
+#define VIC_CPU_BOOT_ERRATA_CPI		(VIC_CPI_LEVEL0 + 8)
+
+#define NR_IRQS 224
+
+#ifndef __ASSEMBLY__
+extern asmlinkage void vic_cpi_interrupt(void);
+extern asmlinkage void vic_sys_interrupt(void);
+extern asmlinkage void vic_cmn_interrupt(void);
+extern asmlinkage void qic_timer_interrupt(void);
+extern asmlinkage void qic_invalidate_interrupt(void);
+extern asmlinkage void qic_reschedule_interrupt(void);
+extern asmlinkage void qic_enable_irq_interrupt(void);
+extern asmlinkage void qic_call_function_interrupt(void);
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_IRQ_VECTORS_H */

arch/i386/mach-voyager/setup.c

+/*
+ *	Machine specific setup for generic
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <asm/arch_hooks.h>
+
+void __init pre_intr_init_hook(void)
+{
+	init_ISA_irqs();
+}
+
+/*
+ * IRQ2 is cascade interrupt to second interrupt controller
+ */
+static struct irqaction irq2 = { no_action, 0, 0, "cascade", NULL, NULL};
+
+void __init intr_init_hook(void)
+{
+#ifdef CONFIG_SMP
+	smp_intr_init();
+#endif
+
+	setup_irq(2, &irq2);
+}
+
+void __init pre_setup_arch_hook(void)
+{
+}
+
+void __init trap_init_hook(void)
+{
+}
+
+static struct irqaction irq0  = { timer_interrupt, SA_INTERRUPT, 0, "timer", NULL, NULL};
+
+void __init time_init_hook(void)
+{
+	setup_irq(0, &irq0);
+}

arch/i386/mach-voyager/setup_arch_post.h

+/* Hook for machine specific memory setup.
+ *
+ * This is included late in kernel/setup.c so that it can make use of all of
+ * the static functions. */
+
+static inline char * __init machine_specific_memory_setup(void)
+{
+	char *who;
+
+	who = "NOT VOYAGER";
+
+	if(voyager_level == 5) {
+		__u32 addr, length;
+		int i;
+
+		who = "Voyager-SUS";
+
+		e820.nr_map = 0;
+		for(i=0; voyager_memory_detect(i, &addr, &length); i++) {
+			add_memory_region(addr, length, E820_RAM);
+		}
+		return who;
+	} else if(voyager_level == 4) {
+		__u32 tom;
+		__u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
+		/* select the DINO config space */
+		outb(VOYAGER_DINO, VOYAGER_CAT_CONFIG_PORT);
+		/* Read DINO top of memory register */
+		tom = ((inb(catbase + 0x4) & 0xf0) << 16)
+			+ ((inb(catbase + 0x5) & 0x7f) << 24);
+
+		if(inb(catbase) != VOYAGER_DINO) {
+			printk(KERN_ERR "Voyager: Failed to get DINO for L4, setting tom to EXT_MEM_K\n");
+			tom = (EXT_MEM_K)<<10;
+		}
+		who = "Voyager-TOM";
+		add_memory_region(0, 0x9f000, E820_RAM);
+		/* map from 1M to top of memory */
+		add_memory_region(1*1024*1024, tom - 1*1024*1024, E820_RAM);
+		/* FIXME: Should check the ASICs to see if I need to
+		 * take out the 8M window.  Just do it at the moment
+		 * */
+		add_memory_region(8*1024*1024, 8*1024*1024, E820_RESERVED);
+		return who;
+	}
+
+	who = "BIOS-e820";
+
+	/*
+	 * Try to copy the BIOS-supplied E820-map.
+	 *
+	 * Otherwise fake a memory map; one section from 0k->640k,
+	 * the next section from 1mb->appropriate_mem_k
+	 */
+	sanitize_e820_map(E820_MAP, &E820_MAP_NR);
+	if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) {
+		unsigned long mem_size;
+
+		/* compare results from other methods and take the greater */
+		if (ALT_MEM_K < EXT_MEM_K) {
+			mem_size = EXT_MEM_K;
+			who = "BIOS-88";
+		} else {
+			mem_size = ALT_MEM_K;
+			who = "BIOS-e801";
+		}
+
+		e820.nr_map = 0;
+		add_memory_region(0, LOWMEMSIZE(), E820_RAM);
+		add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
+  	}
+	return who;
+}

arch/i386/mach-voyager/setup_arch_pre.h

+#include <asm/voyager.h>
+#define VOYAGER_BIOS_INFO ((struct voyager_bios_info *)(PARAM+0x40))
+
+/* Hook to call BIOS initialisation function */
+
+/* for voyager, pass the voyager BIOS/SUS info area to the detection 
+ * routines */
+
+#define ARCH_SETUP	voyager_detect(VOYAGER_BIOS_INFO);
+

arch/i386/mach-voyager/voyager_basic.c

+/* Copyright (C) 1999,2001 
+ *
+ * Author: J.E.J.Bottomley@HansenPartnership.com
+ *
+ * linux/arch/i386/kernel/voyager.c
+ *
+ * This file contains all the voyager specific routines for getting
+ * initialisation of the architecture to function.  For additional
+ * features see:
+ *
+ *	voyager_cat.c - Voyager CAT bus interface
+ *	voyager_smp.c - Voyager SMP hal (emulates linux smp.c)
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+#include <asm/voyager.h>
+#include <asm/vic.h>
+#include <linux/pm.h>
+#include <linux/irq.h>
+#include <asm/tlbflush.h>
+#include <asm/arch_hooks.h>
+
+/*
+ * Power off function, if any
+ */
+void (*pm_power_off)(void);
+
+int reboot_thru_bios;
+
+int voyager_level = 0;
+
+struct voyager_SUS *voyager_SUS = NULL;
+
+void
+voyager_detect(struct voyager_bios_info *bios)
+{
+	if(bios->len != 0xff) {
+		int class = (bios->class_1 << 8) 
+			| (bios->class_2 & 0xff);
+
+		printk("Voyager System detected.\n"
+		       "        Class %x, Revision %d.%d\n",
+		       class, bios->major, bios->minor);
+		if(class == VOYAGER_LEVEL4) 
+			voyager_level = 4;
+		else if(class < VOYAGER_LEVEL5_AND_ABOVE)
+			voyager_level = 3;
+		else
+			voyager_level = 5;
+		printk("        Architecture Level %d\n", voyager_level);
+		if(voyager_level < 4)
+			printk("\n**WARNING**: Voyager HAL only supports Levels 4 and 5 Architectures at the moment\n\n");
+		/* install the power off handler */
+		pm_power_off = voyager_power_off;
+	} else {
+		printk("\n\n**WARNING**: No Voyager Subsystem Found\n");
+	}
+}
+
+void
+voyager_system_interrupt(int cpl, void *dev_id, struct pt_regs *regs)
+{
+	printk("Voyager: detected system interrupt\n");
+}
+
+/* Routine to read information from the extended CMOS area */
+__u8
+voyager_extended_cmos_read(__u16 addr)
+{
+	outb(addr & 0xff, 0x74);
+	outb((addr >> 8) & 0xff, 0x75);
+	return inb(0x76);
+}
+
+/* internal definitions for the SUS Click Map of memory */
+
+#define CLICK_ENTRIES	16
+#define CLICK_SIZE	4096	/* click to byte conversion for Length */
+
+typedef struct ClickMap {
+	struct Entry {
+		__u32	Address;
+		__u32	Length;
+	} Entry[CLICK_ENTRIES];
+} ClickMap_t;
+
+
+/* This routine is pretty much an awful hack to read the bios clickmap by
+ * mapping it into page 0.  There are usually three regions in the map:
+ * 	Base Memory
+ * 	Extended Memory
+ *	zero length marker for end of map
+ *
+ * Returns are 0 for failure and 1 for success on extracting region.
+ */
+int __init
+voyager_memory_detect(int region, __u32 *start, __u32 *length)
+{
+	int i;
+	int retval = 0;
+	__u8 cmos[4];
+	ClickMap_t *map;
+	unsigned long map_addr;
+	unsigned long old;
+
+	if(region >= CLICK_ENTRIES) {
+		printk("Voyager: Illegal ClickMap region %d\n", region);
+		return 0;
+	}
+
+	for(i = 0; i < sizeof(cmos); i++)
+		cmos[i] = voyager_extended_cmos_read(VOYAGER_MEMORY_CLICKMAP + i);
+
+	map_addr = *(unsigned long *)cmos;
+
+	/* steal page 0 for this */
+	old = pg0[0];
+	pg0[0] = ((map_addr & PAGE_MASK) | _PAGE_RW | _PAGE_PRESENT);
+	local_flush_tlb();
+	/* now clear everything out but page 0 */
+	map = (ClickMap_t *)(map_addr & (~PAGE_MASK));
+
+	/* zero length is the end of the clickmap */
+	if(map->Entry[region].Length != 0) {
+		*length = map->Entry[region].Length * CLICK_SIZE;
+		*start = map->Entry[region].Address;
+		retval = 1;
+	}
+
+	/* replace the mapping */
+	pg0[0] = old;
+	local_flush_tlb();
+	return retval;
+}
+
+void
+voyager_dump()
+{
+	/* get here via a sysrq */
+#ifdef CONFIG_SMP
+	voyager_smp_dump();
+#endif
+}
+
+/* voyager specific handling code for timer interrupts.  Used to hand
+ * off the timer tick to the SMP code, since the VIC doesn't have an
+ * internal timer (The QIC does, but that's another story). */
+void
+voyager_timer_interrupt(struct pt_regs *regs)
+{
+	if((jiffies & 0x3ff) == 0) {
+
+		/* There seems to be something flaky in either
+		 * hardware or software that is resetting the timer 0
+		 * count to something much higher than it should be
+		 * This seems to occur in the boot sequence, just
+		 * before root is mounted.  Therefore, every 10
+		 * seconds or so, we sanity check the timer zero count
+		 * and kick it back to where it should be.
+		 *
+		 * FIXME: This is the most awful hack yet seen.  I
+		 * should work out exactly what is interfering with
+		 * the timer count settings early in the boot sequence
+		 * and swiftly introduce it to something sharp and
+		 * pointy.  */
+		__u16 val;
+		extern spinlock_t i8253_lock;
+
+		spin_lock(&i8253_lock);
+		
+		outb_p(0x00, 0x43);
+		val = inb_p(0x40);
+		val |= inb(0x40) << 8;
+		spin_unlock(&i8253_lock);
+
+		if(val > LATCH) {
+			printk("\nVOYAGER: countdown timer value too high (%d), resetting\n\n", val);
+			spin_lock(&i8253_lock);
+			outb(0x34,0x43);
+			outb_p(LATCH & 0xff , 0x40);	/* LSB */
+			outb(LATCH >> 8 , 0x40);	/* MSB */
+			spin_unlock(&i8253_lock);
+		}
+	}
+#ifdef CONFIG_SMP
+	smp_vic_timer_interrupt(regs);
+#endif
+}
+
+void
+voyager_power_off(void)
+{
+	printk("VOYAGER Power Off\n");
+
+	if(voyager_level == 5) {
+		voyager_cat_power_off();
+	} else if(voyager_level == 4) {
+		/* This doesn't apparently work on most L4 machines,
+		 * but the specs say to do this to get automatic power
+		 * off.  Unfortunately, if it doesn't power off the
+		 * machine, it ends up doing a cold restart, which
+		 * isn't really intended, so comment out the code */
+#if 0
+		int port;
+
+	  
+		/* enable the voyager Configuration Space */
+		outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8, 
+		     VOYAGER_MC_SETUP);
+		/* the port for the power off flag is an offset from the
+		   floating base */
+		port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
+		/* set the power off flag */
+		outb(inb(port) | 0x1, port);
+#endif
+	}
+	/* and wait for it to happen */
+	for(;;) {
+		__asm("cli");
+		__asm("hlt");
+	}
+}
+
+/* copied from process.c */
+static inline void
+kb_wait(void)
+{
+	int i;
+
+	for (i=0; i<0x10000; i++)
+		if ((inb_p(0x64) & 0x02) == 0)
+			break;
+}
+
+void
+machine_restart(char *cmd)
+{
+	printk("Voyager Warm Restart\n");
+	kb_wait();
+
+	if(voyager_level == 5) {
+		/* write magic values to the RTC to inform system that
+		 * shutdown is beginning */
+		outb(0x8f, 0x70);
+		outb(0x5 , 0x71);
+		
+		udelay(50);
+		outb(0xfe,0x64);         /* pull reset low */
+	} else if(voyager_level == 4) {
+		__u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
+		__u8 basebd = inb(VOYAGER_MC_SETUP);
+		
+		outb(basebd | 0x08, VOYAGER_MC_SETUP);
+		outb(0x02, catbase + 0x21);
+	}
+	for(;;) {
+		asm("cli");
+		asm("hlt");
+	}
+}
+
+void
+mca_nmi_hook(void)
+{
+	__u8 dumpval __attribute__((unused)) = inb(0xf823);
+	__u8 swnmi __attribute__((unused)) = inb(0xf813);
+	extern void show_stack(unsigned long *);
+
+	/* FIXME: assume dump switch pressed */
+	/* check to see if the dump switch was pressed */
+	VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
+	/* clear swnmi */
+	outb(0xff, 0xf813);
+	/* tell SUS to ignore dump */
+	if(voyager_level == 5 && voyager_SUS != NULL) {
+		if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
+			voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
+			voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
+			udelay(1000);
+			voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
+			voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
+		}
+	}
+	printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id());
+	show_stack(NULL);
+	show_state();
+}
+
+
+
+void
+machine_halt(void)
+{
+	/* treat a halt like a power off */
+	machine_power_off();
+}
+
+void machine_power_off(void)
+{
+	if (pm_power_off)
+		pm_power_off();
+}

arch/i386/mach-voyager/voyager_thread.c

+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* Copyright (C) 2001
+ *
+ * Author: J.E.J.Bottomley@HansenPartnership.com
+ *
+ * linux/arch/i386/kernel/voyager_thread.c
+ *
+ * This module provides the machine status monitor thread for the
+ * voyager architecture.  This allows us to monitor the machine
+ * environment (temp, voltage, fan function) and the front panel and
+ * internal UPS.  If a fault is detected, this thread takes corrective
+ * action (usually just informing init)
+ * */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel_stat.h>
+#include <linux/delay.h>
+#include <linux/mc146818rtc.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/kmod.h>
+#include <linux/completion.h>
+#include <linux/sched.h>
+#include <asm/desc.h>
+#include <asm/voyager.h>
+#include <asm/vic.h>
+#include <asm/pgalloc.h>
+#include <asm/mtrr.h>
+#include <asm/msr.h>
+
+#include <linux/irq.h>
+
+#define THREAD_NAME "kvoyagerd"
+
+/* external variables */
+int kvoyagerd_running = 0;
+DECLARE_MUTEX_LOCKED(kvoyagerd_sem);
+
+static int thread(void *);
+
+static __u8 set_timeout = 0;
+
+/* Start the machine monitor thread.  Return 1 if OK, 0 if fail */
+static int __init
+voyager_thread_start(void)
+{
+	if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) {
+		/* This is serious, but not fatal */
+		printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n");
+		return 1;
+	}
+	return 0;
+}
+
+static int
+execute_helper(void *string)
+{
+	int ret;
+
+	char *envp[] = {
+		"HOME=/",
+		"TERM=linux",
+		"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+		NULL,
+	};
+	char *argv[] = {
+		"/bin/bash",
+		"-c",
+		(char *)string,
+		NULL,
+	};
+
+	if((ret = exec_usermodehelper(argv[0], argv, envp)) < 0) {
+		printk(KERN_ERR "Voyager failed to execute \"%s\"\n",
+		       (char *)string);
+	}
+	return ret;
+}
+
+static void
+execute(char *string)
+{
+	if(kernel_thread(execute_helper, (void *)string, CLONE_VFORK | SIGCHLD) < 0) {
+		printk(KERN_ERR "Voyager failed to fork before exec of \"%s\"\n",
+		       string);
+	}
+}
+
+static void
+check_from_kernel(void)
+{
+	if(voyager_status.switch_off) {
+		
+		/* FIXME: This should be configureable via proc */
+		execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
+	} else if(voyager_status.power_fail) {
+		VDEBUG(("Voyager daemon detected AC power failure\n"));
+		
+		/* FIXME: This should be configureable via proc */
+		execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
+		set_timeout = 1;
+	}
+}
+
+static void
+check_continuing_condition(void)
+{
+	if(voyager_status.power_fail) {
+		__u8 data;
+		voyager_cat_psi(VOYAGER_PSI_SUBREAD, 
+				VOYAGER_PSI_AC_FAIL_REG, &data);
+		if((data & 0x1f) == 0) {
+			/* all power restored */
+			printk(KERN_NOTICE "VOYAGER AC power restored, cancelling shutdown\n");
+			/* FIXME: should be user configureable */
+			execute("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
+			set_timeout = 0;
+		}
+	}
+}
+
+static void
+wakeup(unsigned long unused)
+{
+	up(&kvoyagerd_sem);
+}
+
+static int
+thread(void *unused)
+{
+	struct timer_list wakeup_timer;
+
+	kvoyagerd_running = 1;
+
+	reparent_to_init();
+	daemonize();
+
+	set_timeout = 0;
+
+	init_timer(&wakeup_timer);
+
+	strcpy(current->comm, THREAD_NAME);
+	sigfillset(&current->blocked);
+	current->tty = NULL;	/* get rid of controlling tty */
+
+	printk(KERN_NOTICE "Voyager starting monitor thread\n");
+
+	for(;;) {
+		down_interruptible(&kvoyagerd_sem);
+		VDEBUG(("Voyager Daemon awoken\n"));
+		if(voyager_status.request_from_kernel == 0) {
+			/* probably awoken from timeout */
+			check_continuing_condition();
+		} else {
+			check_from_kernel();
+			voyager_status.request_from_kernel = 0;
+		}
+		if(set_timeout) {
+			del_timer(&wakeup_timer);
+			wakeup_timer.expires = HZ + jiffies;
+			wakeup_timer.function = wakeup;
+			add_timer(&wakeup_timer);
+		}
+	}
+}
+
+static void __exit
+voyager_thread_stop(void)
+{
+	/* FIXME: do nothing at the moment */
+}
+
+module_init(voyager_thread_start);
+//module_exit(voyager_thread_stop);