6 files changed, 714 insertions, 0 deletions

diff --git a/arch/x86/mach-visws/Makefile b/arch/x86/mach-visws/Makefile
new file mode 100644
index 00000000000..835fd96ad76
--- /dev/null
+++ b/arch/x86/mach-visws/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the linux kernel.
+#
+
+obj-y				:= setup.o traps.o reboot.o
+
+obj-$(CONFIG_X86_VISWS_APIC)	+= visws_apic.o
+obj-$(CONFIG_X86_LOCAL_APIC)	+= mpparse.o
diff --git a/arch/x86/mach-visws/mpparse.c b/arch/x86/mach-visws/mpparse.c
new file mode 100644
index 00000000000..f3c74fab8b9
--- /dev/null
+++ b/arch/x86/mach-visws/mpparse.c
@@ -0,0 +1,101 @@
+
+#include <linux/init.h>
+#include <linux/smp.h>
+
+#include <asm/smp.h>
+#include <asm/io.h>
+
+#include "cobalt.h"
+#include "mach_apic.h"
+
+/* Have we found an MP table */
+int smp_found_config;
+
+/*
+ * Various Linux-internal data structures created from the
+ * MP-table.
+ */
+int apic_version [MAX_APICS];
+
+int pic_mode;
+unsigned long mp_lapic_addr;
+
+/* Processor that is doing the boot up */
+unsigned int boot_cpu_physical_apicid = -1U;
+
+/* Bitmask of physically existing CPUs */
+physid_mask_t phys_cpu_present_map;
+
+unsigned int __initdata maxcpus = NR_CPUS;
+
+/*
+ * The Visual Workstation is Intel MP compliant in the hardware
+ * sense, but it doesn't have a BIOS(-configuration table).
+ * No problem for Linux.
+ */
+
+static void __init MP_processor_info (struct mpc_config_processor *m)
+{
+ 	int ver, logical_apicid;
+	physid_mask_t apic_cpus;
+ 	
+	if (!(m->mpc_cpuflag & CPU_ENABLED))
+		return;
+
+	logical_apicid = m->mpc_apicid;
+	printk(KERN_INFO "%sCPU #%d %ld:%ld APIC version %d\n",
+		m->mpc_cpuflag & CPU_BOOTPROCESSOR ? "Bootup " : "",
+		m->mpc_apicid,
+		(m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
+		(m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
+		m->mpc_apicver);
+
+	if (m->mpc_cpuflag & CPU_BOOTPROCESSOR)
+		boot_cpu_physical_apicid = m->mpc_apicid;
+
+	ver = m->mpc_apicver;
+	if ((ver >= 0x14 && m->mpc_apicid >= 0xff) || m->mpc_apicid >= 0xf) {
+		printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
+			m->mpc_apicid, MAX_APICS);
+		return;
+	}
+
+	apic_cpus = apicid_to_cpu_present(m->mpc_apicid);
+	physids_or(phys_cpu_present_map, phys_cpu_present_map, apic_cpus);
+	/*
+	 * Validate version
+	 */
+	if (ver == 0x0) {
+		printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! "
+			"fixing up to 0x10. (tell your hw vendor)\n",
+			m->mpc_apicid);
+		ver = 0x10;
+	}
+	apic_version[m->mpc_apicid] = ver;
+}
+
+void __init find_smp_config(void)
+{
+	struct mpc_config_processor *mp = phys_to_virt(CO_CPU_TAB_PHYS);
+	unsigned short ncpus = readw(phys_to_virt(CO_CPU_NUM_PHYS));
+
+	if (ncpus > CO_CPU_MAX) {
+		printk(KERN_WARNING "find_visws_smp: got cpu count of %d at %p\n",
+			ncpus, mp);
+
+		ncpus = CO_CPU_MAX;
+	}
+
+	if (ncpus > maxcpus)
+		ncpus = maxcpus;
+
+	smp_found_config = 1;
+	while (ncpus--)
+		MP_processor_info(mp++);
+
+	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+}
+
+void __init get_smp_config (void)
+{
+}
diff --git a/arch/x86/mach-visws/reboot.c b/arch/x86/mach-visws/reboot.c
new file mode 100644
index 00000000000..99332abfad4
--- /dev/null
+++ b/arch/x86/mach-visws/reboot.c
@@ -0,0 +1,55 @@
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include "piix4.h"
+
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+void machine_shutdown(void)
+{
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+}
+
+void machine_emergency_restart(void)
+{
+	/*
+	 * Visual Workstations restart after this
+	 * register is poked on the PIIX4
+	 */
+	outb(PIIX4_RESET_VAL, PIIX4_RESET_PORT);
+}
+
+void machine_restart(char * __unused)
+{
+	machine_shutdown();
+	machine_emergency_restart();
+}
+
+void machine_power_off(void)
+{
+	unsigned short pm_status;
+	extern unsigned int pci_bus0;
+
+	while ((pm_status = inw(PMSTS_PORT)) & 0x100)
+		outw(pm_status, PMSTS_PORT);
+
+	outw(PM_SUSPEND_ENABLE, PMCNTRL_PORT);
+
+	mdelay(10);
+
+#define PCI_CONF1_ADDRESS(bus, devfn, reg) \
+	(0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
+
+	outl(PCI_CONF1_ADDRESS(pci_bus0, SPECIAL_DEV, SPECIAL_REG), 0xCF8);
+	outl(PIIX_SPECIAL_STOP, 0xCFC);
+}
+
+void machine_halt(void)
+{
+}
+
diff --git a/arch/x86/mach-visws/setup.c b/arch/x86/mach-visws/setup.c
new file mode 100644
index 00000000000..1f81f10e03a
--- /dev/null
+++ b/arch/x86/mach-visws/setup.c
@@ -0,0 +1,183 @@
+/*
+ *  Unmaintained SGI Visual Workstation support.
+ *  Split out from setup.c by davej@suse.de
+ */
+
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+
+#include <asm/fixmap.h>
+#include <asm/arch_hooks.h>
+#include <asm/io.h>
+#include <asm/e820.h>
+#include <asm/setup.h>
+#include "cobalt.h"
+#include "piix4.h"
+
+int no_broadcast;
+
+char visws_board_type = -1;
+char visws_board_rev = -1;
+
+void __init visws_get_board_type_and_rev(void)
+{
+	int raw;
+
+	visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
+							 >> PIIX_GPI_BD_SHIFT;
+	/*
+	 * Get Board rev.
+	 * First, we have to initialize the 307 part to allow us access
+	 * to the GPIO registers.  Let's map them at 0x0fc0 which is right
+	 * after the PIIX4 PM section.
+	 */
+	outb_p(SIO_DEV_SEL, SIO_INDEX);
+	outb_p(SIO_GP_DEV, SIO_DATA);	/* Talk to GPIO regs. */
+
+	outb_p(SIO_DEV_MSB, SIO_INDEX);
+	outb_p(SIO_GP_MSB, SIO_DATA);	/* MSB of GPIO base address */
+
+	outb_p(SIO_DEV_LSB, SIO_INDEX);
+	outb_p(SIO_GP_LSB, SIO_DATA);	/* LSB of GPIO base address */
+
+	outb_p(SIO_DEV_ENB, SIO_INDEX);
+	outb_p(1, SIO_DATA);		/* Enable GPIO registers. */
+
+	/*
+	 * Now, we have to map the power management section to write
+	 * a bit which enables access to the GPIO registers.
+	 * What lunatic came up with this shit?
+	 */
+	outb_p(SIO_DEV_SEL, SIO_INDEX);
+	outb_p(SIO_PM_DEV, SIO_DATA);	/* Talk to GPIO regs. */
+
+	outb_p(SIO_DEV_MSB, SIO_INDEX);
+	outb_p(SIO_PM_MSB, SIO_DATA);	/* MSB of PM base address */
+
+	outb_p(SIO_DEV_LSB, SIO_INDEX);
+	outb_p(SIO_PM_LSB, SIO_DATA);	/* LSB of PM base address */
+
+	outb_p(SIO_DEV_ENB, SIO_INDEX);
+	outb_p(1, SIO_DATA);		/* Enable PM registers. */
+
+	/*
+	 * Now, write the PM register which enables the GPIO registers.
+	 */
+	outb_p(SIO_PM_FER2, SIO_PM_INDEX);
+	outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
+
+	/*
+	 * Now, initialize the GPIO registers.
+	 * We want them all to be inputs which is the
+	 * power on default, so let's leave them alone.
+	 * So, let's just read the board rev!
+	 */
+	raw = inb_p(SIO_GP_DATA1);
+	raw &= 0x7f;	/* 7 bits of valid board revision ID. */
+
+	if (visws_board_type == VISWS_320) {
+		if (raw < 0x6) {
+			visws_board_rev = 4;
+		} else if (raw < 0xc) {
+			visws_board_rev = 5;
+		} else {
+			visws_board_rev = 6;
+		}
+	} else if (visws_board_type == VISWS_540) {
+			visws_board_rev = 2;
+		} else {
+			visws_board_rev = raw;
+		}
+
+	printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
+	       (visws_board_type == VISWS_320 ? "320" :
+	       (visws_board_type == VISWS_540 ? "540" :
+		"unknown")), visws_board_rev);
+}
+
+void __init pre_intr_init_hook(void)
+{
+	init_VISWS_APIC_irqs();
+}
+
+void __init intr_init_hook(void)
+{
+#ifdef CONFIG_X86_LOCAL_APIC
+	apic_intr_init();
+#endif
+}
+
+void __init pre_setup_arch_hook()
+{
+	visws_get_board_type_and_rev();
+}
+
+static struct irqaction irq0 = {
+	.handler =	timer_interrupt,
+	.flags =	IRQF_DISABLED | IRQF_IRQPOLL,
+	.name =		"timer",
+};
+
+void __init time_init_hook(void)
+{
+	printk(KERN_INFO "Starting Cobalt Timer system clock\n");
+
+	/* Set the countdown value */
+	co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
+
+	/* Start the timer */
+	co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
+
+	/* Enable (unmask) the timer interrupt */
+	co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
+
+	/* Wire cpu IDT entry to s/w handler (and Cobalt APIC to IDT) */
+	setup_irq(0, &irq0);
+}
+
+/* Hook for machine specific memory setup. */
+
+#define MB (1024 * 1024)
+
+unsigned long sgivwfb_mem_phys;
+unsigned long sgivwfb_mem_size;
+EXPORT_SYMBOL(sgivwfb_mem_phys);
+EXPORT_SYMBOL(sgivwfb_mem_size);
+
+long long mem_size __initdata = 0;
+
+char * __init machine_specific_memory_setup(void)
+{
+	long long gfx_mem_size = 8 * MB;
+
+	mem_size = ALT_MEM_K;
+
+	if (!mem_size) {
+		printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
+		mem_size = 128 * MB;
+	}
+
+	/*
+	 * this hardcodes the graphics memory to 8 MB
+	 * it really should be sized dynamically (or at least
+	 * set as a boot param)
+	 */
+	if (!sgivwfb_mem_size) {
+		printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
+		sgivwfb_mem_size = 8 * MB;
+	}
+
+	/*
+	 * Trim to nearest MB
+	 */
+	sgivwfb_mem_size &= ~((1 << 20) - 1);
+	sgivwfb_mem_phys = mem_size - gfx_mem_size;
+
+	add_memory_region(0, LOWMEMSIZE(), E820_RAM);
+	add_memory_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
+	add_memory_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
+
+	return "PROM";
+}
diff --git a/arch/x86/mach-visws/traps.c b/arch/x86/mach-visws/traps.c
new file mode 100644
index 00000000000..843b67acf43
--- /dev/null
+++ b/arch/x86/mach-visws/traps.c
@@ -0,0 +1,68 @@
+/* VISWS traps */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+
+#include <asm/io.h>
+#include <asm/arch_hooks.h>
+#include <asm/apic.h>
+#include "cobalt.h"
+#include "lithium.h"
+
+
+#define A01234 (LI_INTA_0 | LI_INTA_1 | LI_INTA_2 | LI_INTA_3 | LI_INTA_4)
+#define BCD (LI_INTB | LI_INTC | LI_INTD)
+#define ALLDEVS (A01234 | BCD)
+
+static __init void lithium_init(void)
+{
+	set_fixmap(FIX_LI_PCIA, LI_PCI_A_PHYS);
+	set_fixmap(FIX_LI_PCIB, LI_PCI_B_PHYS);
+
+	if ((li_pcia_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
+	    (li_pcia_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
+		printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'A');
+		panic("This machine is not SGI Visual Workstation 320/540");
+	}
+
+	if ((li_pcib_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
+	    (li_pcib_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
+		printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'B');
+		panic("This machine is not SGI Visual Workstation 320/540");
+	}
+
+	li_pcia_write16(LI_PCI_INTEN, ALLDEVS);
+	li_pcib_write16(LI_PCI_INTEN, ALLDEVS);
+}
+
+static __init void cobalt_init(void)
+{
+	/*
+	 * On normal SMP PC this is used only with SMP, but we have to
+	 * use it and set it up here to start the Cobalt clock
+	 */
+	set_fixmap(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
+	setup_local_APIC();
+	printk(KERN_INFO "Local APIC Version %#lx, ID %#lx\n",
+		apic_read(APIC_LVR), apic_read(APIC_ID));
+
+	set_fixmap(FIX_CO_CPU, CO_CPU_PHYS);
+	set_fixmap(FIX_CO_APIC, CO_APIC_PHYS);
+	printk(KERN_INFO "Cobalt Revision %#lx, APIC ID %#lx\n",
+		co_cpu_read(CO_CPU_REV), co_apic_read(CO_APIC_ID));
+
+	/* Enable Cobalt APIC being careful to NOT change the ID! */
+	co_apic_write(CO_APIC_ID, co_apic_read(CO_APIC_ID) | CO_APIC_ENABLE);
+
+	printk(KERN_INFO "Cobalt APIC enabled: ID reg %#lx\n",
+		co_apic_read(CO_APIC_ID));
+}
+
+void __init trap_init_hook(void)
+{
+	lithium_init();
+	cobalt_init();
+}
diff --git a/arch/x86/mach-visws/visws_apic.c b/arch/x86/mach-visws/visws_apic.c
new file mode 100644
index 00000000000..710faf71a65
--- /dev/null
+++ b/arch/x86/mach-visws/visws_apic.c
@@ -0,0 +1,299 @@
+/*
+ *	linux/arch/i386/mach-visws/visws_apic.c
+ *
+ *	Copyright (C) 1999 Bent Hagemark, Ingo Molnar
+ *
+ *  SGI Visual Workstation interrupt controller
+ *
+ *  The Cobalt system ASIC in the Visual Workstation contains a "Cobalt" APIC
+ *  which serves as the main interrupt controller in the system.  Non-legacy
+ *  hardware in the system uses this controller directly.  Legacy devices
+ *  are connected to the PIIX4 which in turn has its 8259(s) connected to
+ *  a of the Cobalt APIC entry.
+ *
+ *  09/02/2000 - Updated for 2.4 by jbarnes@sgi.com
+ *
+ *  25/11/2002 - Updated for 2.5 by Andrey Panin <pazke@orbita1.ru>
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/apic.h>
+#include <asm/i8259.h>
+
+#include "cobalt.h"
+#include "irq_vectors.h"
+
+
+static DEFINE_SPINLOCK(cobalt_lock);
+
+/*
+ * Set the given Cobalt APIC Redirection Table entry to point
+ * to the given IDT vector/index.
+ */
+static inline void co_apic_set(int entry, int irq)
+{
+	co_apic_write(CO_APIC_LO(entry), CO_APIC_LEVEL | (irq + FIRST_EXTERNAL_VECTOR));
+	co_apic_write(CO_APIC_HI(entry), 0);
+}
+
+/*
+ * Cobalt (IO)-APIC functions to handle PCI devices.
+ */
+static inline int co_apic_ide0_hack(void)
+{
+	extern char visws_board_type;
+	extern char visws_board_rev;
+
+	if (visws_board_type == VISWS_320 && visws_board_rev == 5)
+		return 5;
+	return CO_APIC_IDE0;
+}
+
+static int is_co_apic(unsigned int irq)
+{
+	if (IS_CO_APIC(irq))
+		return CO_APIC(irq);
+
+	switch (irq) {
+		case 0: return CO_APIC_CPU;
+		case CO_IRQ_IDE0: return co_apic_ide0_hack();
+		case CO_IRQ_IDE1: return CO_APIC_IDE1;
+		default: return -1;
+	}
+}
+
+
+/*
+ * This is the SGI Cobalt (IO-)APIC:
+ */
+
+static void enable_cobalt_irq(unsigned int irq)
+{
+	co_apic_set(is_co_apic(irq), irq);
+}
+
+static void disable_cobalt_irq(unsigned int irq)
+{
+	int entry = is_co_apic(irq);
+
+	co_apic_write(CO_APIC_LO(entry), CO_APIC_MASK);
+	co_apic_read(CO_APIC_LO(entry));
+}
+
+/*
+ * "irq" really just serves to identify the device.  Here is where we
+ * map this to the Cobalt APIC entry where it's physically wired.
+ * This is called via request_irq -> setup_irq -> irq_desc->startup()
+ */
+static unsigned int startup_cobalt_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cobalt_lock, flags);
+	if ((irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
+		irq_desc[irq].status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING);
+	enable_cobalt_irq(irq);
+	spin_unlock_irqrestore(&cobalt_lock, flags);
+	return 0;
+}
+
+static void ack_cobalt_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cobalt_lock, flags);
+	disable_cobalt_irq(irq);
+	apic_write(APIC_EOI, APIC_EIO_ACK);
+	spin_unlock_irqrestore(&cobalt_lock, flags);
+}
+
+static void end_cobalt_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cobalt_lock, flags);
+	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		enable_cobalt_irq(irq);
+	spin_unlock_irqrestore(&cobalt_lock, flags);
+}
+
+static struct irq_chip cobalt_irq_type = {
+	.typename =	"Cobalt-APIC",
+	.startup =	startup_cobalt_irq,
+	.shutdown =	disable_cobalt_irq,
+	.enable =	enable_cobalt_irq,
+	.disable =	disable_cobalt_irq,
+	.ack =		ack_cobalt_irq,
+	.end =		end_cobalt_irq,
+};
+
+
+/*
+ * This is the PIIX4-based 8259 that is wired up indirectly to Cobalt
+ * -- not the manner expected by the code in i8259.c.
+ *
+ * there is a 'master' physical interrupt source that gets sent to
+ * the CPU. But in the chipset there are various 'virtual' interrupts
+ * waiting to be handled. We represent this to Linux through a 'master'
+ * interrupt controller type, and through a special virtual interrupt-
+ * controller. Device drivers only see the virtual interrupt sources.
+ */
+static unsigned int startup_piix4_master_irq(unsigned int irq)
+{
+	init_8259A(0);
+
+	return startup_cobalt_irq(irq);
+}
+
+static void end_piix4_master_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cobalt_lock, flags);
+	enable_cobalt_irq(irq);
+	spin_unlock_irqrestore(&cobalt_lock, flags);
+}
+
+static struct irq_chip piix4_master_irq_type = {
+	.typename =	"PIIX4-master",
+	.startup =	startup_piix4_master_irq,
+	.ack =		ack_cobalt_irq,
+	.end =		end_piix4_master_irq,
+};
+
+
+static struct irq_chip piix4_virtual_irq_type = {
+	.typename =	"PIIX4-virtual",
+	.shutdown =	disable_8259A_irq,
+	.enable =	enable_8259A_irq,
+	.disable =	disable_8259A_irq,
+};
+
+
+/*
+ * PIIX4-8259 master/virtual functions to handle interrupt requests
+ * from legacy devices: floppy, parallel, serial, rtc.
+ *
+ * None of these get Cobalt APIC entries, neither do they have IDT
+ * entries. These interrupts are purely virtual and distributed from
+ * the 'master' interrupt source: CO_IRQ_8259.
+ *
+ * When the 8259 interrupts its handler figures out which of these
+ * devices is interrupting and dispatches to its handler.
+ *
+ * CAREFUL: devices see the 'virtual' interrupt only. Thus disable/
+ * enable_irq gets the right irq. This 'master' irq is never directly
+ * manipulated by any driver.
+ */
+static irqreturn_t piix4_master_intr(int irq, void *dev_id)
+{
+	int realirq;
+	irq_desc_t *desc;
+	unsigned long flags;
+
+	spin_lock_irqsave(&i8259A_lock, flags);
+
+	/* Find out what's interrupting in the PIIX4 master 8259 */
+	outb(0x0c, 0x20);		/* OCW3 Poll command */
+	realirq = inb(0x20);
+
+	/*
+	 * Bit 7 == 0 means invalid/spurious
+	 */
+	if (unlikely(!(realirq & 0x80)))
+		goto out_unlock;
+
+	realirq &= 7;
+
+	if (unlikely(realirq == 2)) {
+		outb(0x0c, 0xa0);
+		realirq = inb(0xa0);
+
+		if (unlikely(!(realirq & 0x80)))
+			goto out_unlock;
+
+		realirq = (realirq & 7) + 8;
+	}
+
+	/* mask and ack interrupt */
+	cached_irq_mask |= 1 << realirq;
+	if (unlikely(realirq > 7)) {
+		inb(0xa1);
+		outb(cached_slave_mask, 0xa1);
+		outb(0x60 + (realirq & 7), 0xa0);
+		outb(0x60 + 2, 0x20);
+	} else {
+		inb(0x21);
+		outb(cached_master_mask, 0x21);
+		outb(0x60 + realirq, 0x20);
+	}
+
+	spin_unlock_irqrestore(&i8259A_lock, flags);
+
+	desc = irq_desc + realirq;
+
+	/*
+	 * handle this 'virtual interrupt' as a Cobalt one now.
+	 */
+	kstat_cpu(smp_processor_id()).irqs[realirq]++;
+
+	if (likely(desc->action != NULL))
+		handle_IRQ_event(realirq, desc->action);
+
+	if (!(desc->status & IRQ_DISABLED))
+		enable_8259A_irq(realirq);
+
+	return IRQ_HANDLED;
+
+out_unlock:
+	spin_unlock_irqrestore(&i8259A_lock, flags);
+	return IRQ_NONE;
+}
+
+static struct irqaction master_action = {
+	.handler =	piix4_master_intr,
+	.name =		"PIIX4-8259",
+};
+
+static struct irqaction cascade_action = {
+	.handler = 	no_action,
+	.name =		"cascade",
+};
+
+
+void init_VISWS_APIC_irqs(void)
+{
+	int i;
+
+	for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 1;
+
+		if (i == 0) {
+			irq_desc[i].chip = &cobalt_irq_type;
+		}
+		else if (i == CO_IRQ_IDE0) {
+			irq_desc[i].chip = &cobalt_irq_type;
+		}
+		else if (i == CO_IRQ_IDE1) {
+			irq_desc[i].chip = &cobalt_irq_type;
+		}
+		else if (i == CO_IRQ_8259) {
+			irq_desc[i].chip = &piix4_master_irq_type;
+		}
+		else if (i < CO_IRQ_APIC0) {
+			irq_desc[i].chip = &piix4_virtual_irq_type;
+		}
+		else if (IS_CO_APIC(i)) {
+			irq_desc[i].chip = &cobalt_irq_type;
+		}
+	}
+
+	setup_irq(CO_IRQ_8259, &master_action);
+	setup_irq(2, &cascade_action);
+}