Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1931 insertions, 0 deletions

diff --git a/arch/i386/mach-voyager/voyager_smp.c b/arch/i386/mach-voyager/voyager_smp.c
new file mode 100644
index 000000000000..903d739ca74a
--- /dev/null
+++ b/arch/i386/mach-voyager/voyager_smp.c
@@ -0,0 +1,1931 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* Copyright (C) 1999,2001
+ *
+ * Author: J.E.J.Bottomley@HansenPartnership.com
+ *
+ * linux/arch/i386/kernel/voyager_smp.c
+ *
+ * This file provides all the same external entries as smp.c but uses
+ * the voyager hal to provide the functionality
+ */
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel_stat.h>
+#include <linux/delay.h>
+#include <linux/mc146818rtc.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/completion.h>
+#include <asm/desc.h>
+#include <asm/voyager.h>
+#include <asm/vic.h>
+#include <asm/mtrr.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/arch_hooks.h>
+
+#include <linux/irq.h>
+
+/* TLB state -- visible externally, indexed physically */
+DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate) ____cacheline_aligned = { &init_mm, 0 };
+
+/* CPU IRQ affinity -- set to all ones initially */
+static unsigned long cpu_irq_affinity[NR_CPUS] __cacheline_aligned = { [0 ... NR_CPUS-1]  = ~0UL };
+
+/* per CPU data structure (for /proc/cpuinfo et al), visible externally
+ * indexed physically */
+struct cpuinfo_x86 cpu_data[NR_CPUS] __cacheline_aligned;
+
+/* physical ID of the CPU used to boot the system */
+unsigned char boot_cpu_id;
+
+/* The memory line addresses for the Quad CPIs */
+struct voyager_qic_cpi *voyager_quad_cpi_addr[NR_CPUS] __cacheline_aligned;
+
+/* The masks for the Extended VIC processors, filled in by cat_init */
+__u32 voyager_extended_vic_processors = 0;
+
+/* Masks for the extended Quad processors which cannot be VIC booted */
+__u32 voyager_allowed_boot_processors = 0;
+
+/* The mask for the Quad Processors (both extended and non-extended) */
+__u32 voyager_quad_processors = 0;
+
+/* Total count of live CPUs, used in process.c to display
+ * the CPU information and in irq.c for the per CPU irq
+ * activity count.  Finally exported by i386_ksyms.c */
+static int voyager_extended_cpus = 1;
+
+/* Have we found an SMP box - used by time.c to do the profiling
+   interrupt for timeslicing; do not set to 1 until the per CPU timer
+   interrupt is active */
+int smp_found_config = 0;
+
+/* Used for the invalidate map that's also checked in the spinlock */
+static volatile unsigned long smp_invalidate_needed;
+
+/* Bitmask of currently online CPUs - used by setup.c for
+   /proc/cpuinfo, visible externally but still physical */
+cpumask_t cpu_online_map = CPU_MASK_NONE;
+
+/* Bitmask of CPUs present in the system - exported by i386_syms.c, used
+ * by scheduler but indexed physically */
+cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+
+
+/* The internal functions */
+static void send_CPI(__u32 cpuset, __u8 cpi);
+static void ack_CPI(__u8 cpi);
+static int ack_QIC_CPI(__u8 cpi);
+static void ack_special_QIC_CPI(__u8 cpi);
+static void ack_VIC_CPI(__u8 cpi);
+static void send_CPI_allbutself(__u8 cpi);
+static void enable_vic_irq(unsigned int irq);
+static void disable_vic_irq(unsigned int irq);
+static unsigned int startup_vic_irq(unsigned int irq);
+static void enable_local_vic_irq(unsigned int irq);
+static void disable_local_vic_irq(unsigned int irq);
+static void before_handle_vic_irq(unsigned int irq);
+static void after_handle_vic_irq(unsigned int irq);
+static void set_vic_irq_affinity(unsigned int irq, cpumask_t mask);
+static void ack_vic_irq(unsigned int irq);
+static void vic_enable_cpi(void);
+static void do_boot_cpu(__u8 cpuid);
+static void do_quad_bootstrap(void);
+static inline void wrapper_smp_local_timer_interrupt(struct pt_regs *);
+
+int hard_smp_processor_id(void);
+
+/* Inline functions */
+static inline void
+send_one_QIC_CPI(__u8 cpu, __u8 cpi)
+{
+        voyager_quad_cpi_addr[cpu]->qic_cpi[cpi].cpi =
+                (smp_processor_id() << 16) + cpi;
+}
+
+static inline void
+send_QIC_CPI(__u32 cpuset, __u8 cpi)
+{
+        int cpu;
+
+        for_each_online_cpu(cpu) {
+                if(cpuset & (1<<cpu)) {
+#ifdef VOYAGER_DEBUG
+                        if(!cpu_isset(cpu, cpu_online_map))
+                                VDEBUG(("CPU%d sending cpi %d to CPU%d not in cpu_online_map\n", hard_smp_processor_id(), cpi, cpu));
+#endif
+                        send_one_QIC_CPI(cpu, cpi - QIC_CPI_OFFSET);
+                }
+        }
+}
+
+static inline void
+send_one_CPI(__u8 cpu, __u8 cpi)
+{
+        if(voyager_quad_processors & (1<<cpu))
+                send_one_QIC_CPI(cpu, cpi - QIC_CPI_OFFSET);
+        else
+                send_CPI(1<<cpu, cpi);
+}
+
+static inline void
+send_CPI_allbutself(__u8 cpi)
+{
+        __u8 cpu = smp_processor_id();
+        __u32 mask = cpus_addr(cpu_online_map)[0] & ~(1 << cpu);
+        send_CPI(mask, cpi);
+}
+
+static inline int
+is_cpu_quad(void)
+{
+        __u8 cpumask = inb(VIC_PROC_WHO_AM_I);
+        return ((cpumask & QUAD_IDENTIFIER) == QUAD_IDENTIFIER);
+}
+
+static inline int
+is_cpu_extended(void)
+{
+        __u8 cpu = hard_smp_processor_id();
+
+        return(voyager_extended_vic_processors & (1<<cpu));
+}
+
+static inline int
+is_cpu_vic_boot(void)
+{
+        __u8 cpu = hard_smp_processor_id();
+
+        return(voyager_extended_vic_processors
+               & voyager_allowed_boot_processors & (1<<cpu));
+}
+
+
+static inline void
+ack_CPI(__u8 cpi)
+{
+        switch(cpi) {
+        case VIC_CPU_BOOT_CPI:
+                if(is_cpu_quad() && !is_cpu_vic_boot())
+                        ack_QIC_CPI(cpi);
+                else
+                        ack_VIC_CPI(cpi);
+                break;
+        case VIC_SYS_INT:
+        case VIC_CMN_INT: 
+                /* These are slightly strange.  Even on the Quad card,
+                 * They are vectored as VIC CPIs */
+                if(is_cpu_quad())
+                        ack_special_QIC_CPI(cpi);
+                else
+                        ack_VIC_CPI(cpi);
+                break;
+        default:
+                printk("VOYAGER ERROR: CPI%d is in common CPI code\n", cpi);
+                break;
+        }
+}
+
+/* local variables */
+
+/* The VIC IRQ descriptors -- these look almost identical to the
+ * 8259 IRQs except that masks and things must be kept per processor
+ */
+static struct hw_interrupt_type vic_irq_type = {
+        .typename = "VIC-level",
+        .startup = startup_vic_irq,
+        .shutdown = disable_vic_irq,
+        .enable = enable_vic_irq,
+        .disable = disable_vic_irq,
+        .ack = before_handle_vic_irq,
+        .end = after_handle_vic_irq,
+        .set_affinity = set_vic_irq_affinity,
+};
+
+/* used to count up as CPUs are brought on line (starts at 0) */
+static int cpucount = 0;
+
+/* steal a page from the bottom of memory for the trampoline and
+ * squirrel its address away here.  This will be in kernel virtual
+ * space */
+static __u32 trampoline_base;
+
+/* The per cpu profile stuff - used in smp_local_timer_interrupt */
+static DEFINE_PER_CPU(int, prof_multiplier) = 1;
+static DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
+static DEFINE_PER_CPU(int, prof_counter) =  1;
+
+/* the map used to check if a CPU has booted */
+static __u32 cpu_booted_map;
+
+/* the synchronize flag used to hold all secondary CPUs spinning in
+ * a tight loop until the boot sequence is ready for them */
+static cpumask_t smp_commenced_mask = CPU_MASK_NONE;
+
+/* This is for the new dynamic CPU boot code */
+cpumask_t cpu_callin_map = CPU_MASK_NONE;
+cpumask_t cpu_callout_map = CPU_MASK_NONE;
+
+/* The per processor IRQ masks (these are usually kept in sync) */
+static __u16 vic_irq_mask[NR_CPUS] __cacheline_aligned;
+
+/* the list of IRQs to be enabled by the VIC_ENABLE_IRQ_CPI */
+static __u16 vic_irq_enable_mask[NR_CPUS] __cacheline_aligned = { 0 };
+
+/* Lock for enable/disable of VIC interrupts */
+static  __cacheline_aligned DEFINE_SPINLOCK(vic_irq_lock);
+
+/* The boot processor is correctly set up in PC mode when it 
+ * comes up, but the secondaries need their master/slave 8259
+ * pairs initializing correctly */
+
+/* Interrupt counters (per cpu) and total - used to try to
+ * even up the interrupt handling routines */
+static long vic_intr_total = 0;
+static long vic_intr_count[NR_CPUS] __cacheline_aligned = { 0 };
+static unsigned long vic_tick[NR_CPUS] __cacheline_aligned = { 0 };
+
+/* Since we can only use CPI0, we fake all the other CPIs */
+static unsigned long vic_cpi_mailbox[NR_CPUS] __cacheline_aligned;
+
+/* debugging routine to read the isr of the cpu's pic */
+static inline __u16
+vic_read_isr(void)
+{
+        __u16 isr;
+
+        outb(0x0b, 0xa0);
+        isr = inb(0xa0) << 8;
+        outb(0x0b, 0x20);
+        isr |= inb(0x20);
+
+        return isr;
+}
+
+static __init void
+qic_setup(void)
+{
+        if(!is_cpu_quad()) {
+                /* not a quad, no setup */
+                return;
+        }
+        outb(QIC_DEFAULT_MASK0, QIC_MASK_REGISTER0);
+        outb(QIC_CPI_ENABLE, QIC_MASK_REGISTER1);
+        
+        if(is_cpu_extended()) {
+                /* the QIC duplicate of the VIC base register */
+                outb(VIC_DEFAULT_CPI_BASE, QIC_VIC_CPI_BASE_REGISTER);
+                outb(QIC_DEFAULT_CPI_BASE, QIC_CPI_BASE_REGISTER);
+
+                /* FIXME: should set up the QIC timer and memory parity
+                 * error vectors here */
+        }
+}
+
+static __init void
+vic_setup_pic(void)
+{
+        outb(1, VIC_REDIRECT_REGISTER_1);
+        /* clear the claim registers for dynamic routing */
+        outb(0, VIC_CLAIM_REGISTER_0);
+        outb(0, VIC_CLAIM_REGISTER_1);
+
+        outb(0, VIC_PRIORITY_REGISTER);
+        /* Set the Primary and Secondary Microchannel vector
+         * bases to be the same as the ordinary interrupts
+         *
+         * FIXME: This would be more efficient using separate
+         * vectors. */
+        outb(FIRST_EXTERNAL_VECTOR, VIC_PRIMARY_MC_BASE);
+        outb(FIRST_EXTERNAL_VECTOR, VIC_SECONDARY_MC_BASE);
+        /* Now initiallise the master PIC belonging to this CPU by
+         * sending the four ICWs */
+
+        /* ICW1: level triggered, ICW4 needed */
+        outb(0x19, 0x20);
+
+        /* ICW2: vector base */
+        outb(FIRST_EXTERNAL_VECTOR, 0x21);
+
+        /* ICW3: slave at line 2 */
+        outb(0x04, 0x21);
+
+        /* ICW4: 8086 mode */
+        outb(0x01, 0x21);
+
+        /* now the same for the slave PIC */
+
+        /* ICW1: level trigger, ICW4 needed */
+        outb(0x19, 0xA0);
+
+        /* ICW2: slave vector base */
+        outb(FIRST_EXTERNAL_VECTOR + 8, 0xA1);
+        
+        /* ICW3: slave ID */
+        outb(0x02, 0xA1);
+
+        /* ICW4: 8086 mode */
+        outb(0x01, 0xA1);
+}
+
+static void
+do_quad_bootstrap(void)
+{
+        if(is_cpu_quad() && is_cpu_vic_boot()) {
+                int i;
+                unsigned long flags;
+                __u8 cpuid = hard_smp_processor_id();
+
+                local_irq_save(flags);
+
+                for(i = 0; i<4; i++) {
+                        /* FIXME: this would be >>3 &0x7 on the 32 way */
+                        if(((cpuid >> 2) & 0x03) == i)
+                                /* don't lower our own mask! */
+                                continue;
+
+                        /* masquerade as local Quad CPU */
+                        outb(QIC_CPUID_ENABLE | i, QIC_PROCESSOR_ID);
+                        /* enable the startup CPI */
+                        outb(QIC_BOOT_CPI_MASK, QIC_MASK_REGISTER1);
+                        /* restore cpu id */
+                        outb(0, QIC_PROCESSOR_ID);
+                }
+                local_irq_restore(flags);
+        }
+}
+
+
+/* Set up all the basic stuff: read the SMP config and make all the
+ * SMP information reflect only the boot cpu.  All others will be
+ * brought on-line later. */
+void __init 
+find_smp_config(void)
+{
+        int i;
+
+        boot_cpu_id = hard_smp_processor_id();
+
+        printk("VOYAGER SMP: Boot cpu is %d\n", boot_cpu_id);
+
+        /* initialize the CPU structures (moved from smp_boot_cpus) */
+        for(i=0; i<NR_CPUS; i++) {
+                cpu_irq_affinity[i] = ~0;
+        }
+        cpu_online_map = cpumask_of_cpu(boot_cpu_id);
+
+        /* The boot CPU must be extended */
+        voyager_extended_vic_processors = 1<<boot_cpu_id;
+        /* initially, all of the first 8 cpu's can boot */
+        voyager_allowed_boot_processors = 0xff;
+        /* set up everything for just this CPU, we can alter
+         * this as we start the other CPUs later */
+        /* now get the CPU disposition from the extended CMOS */
+        cpus_addr(phys_cpu_present_map)[0] = voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK);
+        cpus_addr(phys_cpu_present_map)[0] |= voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 1) << 8;
+        cpus_addr(phys_cpu_present_map)[0] |= voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 2) << 16;
+        cpus_addr(phys_cpu_present_map)[0] |= voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 3) << 24;
+        printk("VOYAGER SMP: phys_cpu_present_map = 0x%lx\n", cpus_addr(phys_cpu_present_map)[0]);
+        /* Here we set up the VIC to enable SMP */
+        /* enable the CPIs by writing the base vector to their register */
+        outb(VIC_DEFAULT_CPI_BASE, VIC_CPI_BASE_REGISTER);
+        outb(1, VIC_REDIRECT_REGISTER_1);
+        /* set the claim registers for static routing --- Boot CPU gets
+         * all interrupts untill all other CPUs started */
+        outb(0xff, VIC_CLAIM_REGISTER_0);
+        outb(0xff, VIC_CLAIM_REGISTER_1);
+        /* Set the Primary and Secondary Microchannel vector
+         * bases to be the same as the ordinary interrupts
+         *
+         * FIXME: This would be more efficient using separate
+         * vectors. */
+        outb(FIRST_EXTERNAL_VECTOR, VIC_PRIMARY_MC_BASE);
+        outb(FIRST_EXTERNAL_VECTOR, VIC_SECONDARY_MC_BASE);
+
+        /* Finally tell the firmware that we're driving */
+        outb(inb(VOYAGER_SUS_IN_CONTROL_PORT) | VOYAGER_IN_CONTROL_FLAG,
+             VOYAGER_SUS_IN_CONTROL_PORT);
+
+        current_thread_info()->cpu = boot_cpu_id;
+}
+
+/*
+ *      The bootstrap kernel entry code has set these up. Save them
+ *      for a given CPU, id is physical */
+void __init
+smp_store_cpu_info(int id)
+{
+        struct cpuinfo_x86 *c=&cpu_data[id];
+
+        *c = boot_cpu_data;
+
+        identify_cpu(c);
+}
+
+/* set up the trampoline and return the physical address of the code */
+static __u32 __init
+setup_trampoline(void)
+{
+        /* these two are global symbols in trampoline.S */
+        extern __u8 trampoline_end[];
+        extern __u8 trampoline_data[];
+
+        memcpy((__u8 *)trampoline_base, trampoline_data,
+               trampoline_end - trampoline_data);
+        return virt_to_phys((__u8 *)trampoline_base);
+}
+
+/* Routine initially called when a non-boot CPU is brought online */
+static void __init
+start_secondary(void *unused)
+{
+        __u8 cpuid = hard_smp_processor_id();
+        /* external functions not defined in the headers */
+        extern void calibrate_delay(void);
+
+        cpu_init();
+
+        /* OK, we're in the routine */
+        ack_CPI(VIC_CPU_BOOT_CPI);
+
+        /* setup the 8259 master slave pair belonging to this CPU ---
+         * we won't actually receive any until the boot CPU
+         * relinquishes it's static routing mask */
+        vic_setup_pic();
+
+        qic_setup();
+
+        if(is_cpu_quad() && !is_cpu_vic_boot()) {
+                /* clear the boot CPI */
+                __u8 dummy;
+
+                dummy = voyager_quad_cpi_addr[cpuid]->qic_cpi[VIC_CPU_BOOT_CPI].cpi;
+                printk("read dummy %d\n", dummy);
+        }
+
+        /* lower the mask to receive CPIs */
+        vic_enable_cpi();
+
+        VDEBUG(("VOYAGER SMP: CPU%d, stack at about %p\n", cpuid, &cpuid));
+
+        /* enable interrupts */
+        local_irq_enable();
+
+        /* get our bogomips */
+        calibrate_delay();
+
+        /* save our processor parameters */
+        smp_store_cpu_info(cpuid);
+
+        /* if we're a quad, we may need to bootstrap other CPUs */
+        do_quad_bootstrap();
+
+        /* FIXME: this is rather a poor hack to prevent the CPU
+         * activating softirqs while it's supposed to be waiting for
+         * permission to proceed.  Without this, the new per CPU stuff
+         * in the softirqs will fail */
+        local_irq_disable();
+        cpu_set(cpuid, cpu_callin_map);
+
+        /* signal that we're done */
+        cpu_booted_map = 1;
+
+        while (!cpu_isset(cpuid, smp_commenced_mask))
+                rep_nop();
+        local_irq_enable();
+
+        local_flush_tlb();
+
+        cpu_set(cpuid, cpu_online_map);
+        wmb();
+        cpu_idle();
+}
+
+
+/* Routine to kick start the given CPU and wait for it to report ready
+ * (or timeout in startup).  When this routine returns, the requested
+ * CPU is either fully running and configured or known to be dead.
+ *
+ * We call this routine sequentially 1 CPU at a time, so no need for
+ * locking */
+
+static void __init
+do_boot_cpu(__u8 cpu)
+{
+        struct task_struct *idle;
+        int timeout;
+        unsigned long flags;
+        int quad_boot = (1<<cpu) & voyager_quad_processors 
+                & ~( voyager_extended_vic_processors
+                     & voyager_allowed_boot_processors);
+
+        /* For the 486, we can't use the 4Mb page table trick, so
+         * must map a region of memory */
+#ifdef CONFIG_M486
+        int i;
+        unsigned long *page_table_copies = (unsigned long *)
+                __get_free_page(GFP_KERNEL);
+#endif
+        pgd_t orig_swapper_pg_dir0;
+
+        /* This is an area in head.S which was used to set up the
+         * initial kernel stack.  We need to alter this to give the
+         * booting CPU a new stack (taken from its idle process) */
+        extern struct {
+                __u8 *esp;
+                unsigned short ss;
+        } stack_start;
+        /* This is the format of the CPI IDT gate (in real mode) which
+         * we're hijacking to boot the CPU */
+        union   IDTFormat {
+                struct seg {
+                        __u16   Offset;
+                        __u16   Segment;
+                } idt;
+                __u32 val;
+        } hijack_source;
+
+        __u32 *hijack_vector;
+        __u32 start_phys_address = setup_trampoline();
+
+        /* There's a clever trick to this: The linux trampoline is
+         * compiled to begin at absolute location zero, so make the
+         * address zero but have the data segment selector compensate
+         * for the actual address */
+        hijack_source.idt.Offset = start_phys_address & 0x000F;
+        hijack_source.idt.Segment = (start_phys_address >> 4) & 0xFFFF;
+
+        cpucount++;
+        idle = fork_idle(cpu);
+        if(IS_ERR(idle))
+                panic("failed fork for CPU%d", cpu);
+        idle->thread.eip = (unsigned long) start_secondary;
+        /* init_tasks (in sched.c) is indexed logically */
+        stack_start.esp = (void *) idle->thread.esp;
+
+        irq_ctx_init(cpu);
+
+        /* Note: Don't modify initial ss override */
+        VDEBUG(("VOYAGER SMP: Booting CPU%d at 0x%lx[%x:%x], stack %p\n", cpu, 
+                (unsigned long)hijack_source.val, hijack_source.idt.Segment,
+                hijack_source.idt.Offset, stack_start.esp));
+        /* set the original swapper_pg_dir[0] to map 0 to 4Mb transparently
+         * (so that the booting CPU can find start_32 */
+        orig_swapper_pg_dir0 = swapper_pg_dir[0];
+#ifdef CONFIG_M486
+        if(page_table_copies == NULL)
+                panic("No free memory for 486 page tables\n");
+        for(i = 0; i < PAGE_SIZE/sizeof(unsigned long); i++)
+                page_table_copies[i] = (i * PAGE_SIZE) 
+                        | _PAGE_RW | _PAGE_USER | _PAGE_PRESENT;
+
+        ((unsigned long *)swapper_pg_dir)[0] = 
+                ((virt_to_phys(page_table_copies)) & PAGE_MASK)
+                | _PAGE_RW | _PAGE_USER | _PAGE_PRESENT;
+#else
+        ((unsigned long *)swapper_pg_dir)[0] = 
+                (virt_to_phys(pg0) & PAGE_MASK)
+                | _PAGE_RW | _PAGE_USER | _PAGE_PRESENT;
+#endif
+
+        if(quad_boot) {
+                printk("CPU %d: non extended Quad boot\n", cpu);
+                hijack_vector = (__u32 *)phys_to_virt((VIC_CPU_BOOT_CPI + QIC_DEFAULT_CPI_BASE)*4);
+                *hijack_vector = hijack_source.val;
+        } else {
+                printk("CPU%d: extended VIC boot\n", cpu);
+                hijack_vector = (__u32 *)phys_to_virt((VIC_CPU_BOOT_CPI + VIC_DEFAULT_CPI_BASE)*4);
+                *hijack_vector = hijack_source.val;
+                /* VIC errata, may also receive interrupt at this address */
+                hijack_vector = (__u32 *)phys_to_virt((VIC_CPU_BOOT_ERRATA_CPI + VIC_DEFAULT_CPI_BASE)*4);
+                *hijack_vector = hijack_source.val;
+        }
+        /* All non-boot CPUs start with interrupts fully masked.  Need
+         * to lower the mask of the CPI we're about to send.  We do
+         * this in the VIC by masquerading as the processor we're
+         * about to boot and lowering its interrupt mask */
+        local_irq_save(flags);
+        if(quad_boot) {
+                send_one_QIC_CPI(cpu, VIC_CPU_BOOT_CPI);
+        } else {
+                outb(VIC_CPU_MASQUERADE_ENABLE | cpu, VIC_PROCESSOR_ID);
+                /* here we're altering registers belonging to `cpu' */
+                
+                outb(VIC_BOOT_INTERRUPT_MASK, 0x21);
+                /* now go back to our original identity */
+                outb(boot_cpu_id, VIC_PROCESSOR_ID);
+
+                /* and boot the CPU */
+
+                send_CPI((1<<cpu), VIC_CPU_BOOT_CPI);
+        }
+        cpu_booted_map = 0;
+        local_irq_restore(flags);
+
+        /* now wait for it to become ready (or timeout) */
+        for(timeout = 0; timeout < 50000; timeout++) {
+                if(cpu_booted_map)
+                        break;
+                udelay(100);
+        }
+        /* reset the page table */
+        swapper_pg_dir[0] = orig_swapper_pg_dir0;
+        local_flush_tlb();
+#ifdef CONFIG_M486
+        free_page((unsigned long)page_table_copies);
+#endif
+          
+        if (cpu_booted_map) {
+                VDEBUG(("CPU%d: Booted successfully, back in CPU %d\n",
+                        cpu, smp_processor_id()));
+        
+                printk("CPU%d: ", cpu);
+                print_cpu_info(&cpu_data[cpu]);
+                wmb();
+                cpu_set(cpu, cpu_callout_map);
+        }
+        else {
+                printk("CPU%d FAILED TO BOOT: ", cpu);
+                if (*((volatile unsigned char *)phys_to_virt(start_phys_address))==0xA5)
+                        printk("Stuck.\n");
+                else
+                        printk("Not responding.\n");
+                
+                cpucount--;
+        }
+}
+
+void __init
+smp_boot_cpus(void)
+{
+        int i;
+
+        /* CAT BUS initialisation must be done after the memory */
+        /* FIXME: The L4 has a catbus too, it just needs to be
+         * accessed in a totally different way */
+        if(voyager_level == 5) {
+                voyager_cat_init();
+
+                /* now that the cat has probed the Voyager System Bus, sanity
+                 * check the cpu map */
+                if( ((voyager_quad_processors | voyager_extended_vic_processors)
+                     & cpus_addr(phys_cpu_present_map)[0]) != cpus_addr(phys_cpu_present_map)[0]) {
+                        /* should panic */
+                        printk("\n\n***WARNING*** Sanity check of CPU present map FAILED\n");
+                }
+        } else if(voyager_level == 4)
+                voyager_extended_vic_processors = cpus_addr(phys_cpu_present_map)[0];
+
+        /* this sets up the idle task to run on the current cpu */
+        voyager_extended_cpus = 1;
+        /* Remove the global_irq_holder setting, it triggers a BUG() on
+         * schedule at the moment */
+        //global_irq_holder = boot_cpu_id;
+
+        /* FIXME: Need to do something about this but currently only works
+         * on CPUs with a tsc which none of mine have. 
+        smp_tune_scheduling();
+         */
+        smp_store_cpu_info(boot_cpu_id);
+        printk("CPU%d: ", boot_cpu_id);
+        print_cpu_info(&cpu_data[boot_cpu_id]);
+
+        if(is_cpu_quad()) {
+                /* booting on a Quad CPU */
+                printk("VOYAGER SMP: Boot CPU is Quad\n");
+                qic_setup();
+                do_quad_bootstrap();
+        }
+
+        /* enable our own CPIs */
+        vic_enable_cpi();
+
+        cpu_set(boot_cpu_id, cpu_online_map);
+        cpu_set(boot_cpu_id, cpu_callout_map);
+        
+        /* loop over all the extended VIC CPUs and boot them.  The 
+         * Quad CPUs must be bootstrapped by their extended VIC cpu */
+        for(i = 0; i < NR_CPUS; i++) {
+                if(i == boot_cpu_id || !cpu_isset(i, phys_cpu_present_map))
+                        continue;
+                do_boot_cpu(i);
+                /* This udelay seems to be needed for the Quad boots
+                 * don't remove unless you know what you're doing */
+                udelay(1000);
+        }
+        /* we could compute the total bogomips here, but why bother?,
+         * Code added from smpboot.c */
+        {
+                unsigned long bogosum = 0;
+                for (i = 0; i < NR_CPUS; i++)
+                        if (cpu_isset(i, cpu_online_map))
+                                bogosum += cpu_data[i].loops_per_jiffy;
+                printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
+                        cpucount+1,
+                        bogosum/(500000/HZ),
+                        (bogosum/(5000/HZ))%100);
+        }
+        voyager_extended_cpus = hweight32(voyager_extended_vic_processors);
+        printk("VOYAGER: Extended (interrupt handling CPUs): %d, non-extended: %d\n", voyager_extended_cpus, num_booting_cpus() - voyager_extended_cpus);
+        /* that's it, switch to symmetric mode */
+        outb(0, VIC_PRIORITY_REGISTER);
+        outb(0, VIC_CLAIM_REGISTER_0);
+        outb(0, VIC_CLAIM_REGISTER_1);
+        
+        VDEBUG(("VOYAGER SMP: Booted with %d CPUs\n", num_booting_cpus()));
+}
+
+/* Reload the secondary CPUs task structure (this function does not
+ * return ) */
+void __init 
+initialize_secondary(void)
+{
+#if 0
+        // AC kernels only
+        set_current(hard_get_current());
+#endif
+
+        /*
+         * We don't actually need to load the full TSS,
+         * basically just the stack pointer and the eip.
+         */
+
+        asm volatile(
+                "movl %0,%%esp\n\t"
+                "jmp *%1"
+                :
+                :"r" (current->thread.esp),"r" (current->thread.eip));
+}
+
+/* handle a Voyager SYS_INT -- If we don't, the base board will
+ * panic the system.
+ *
+ * System interrupts occur because some problem was detected on the
+ * various busses.  To find out what you have to probe all the
+ * hardware via the CAT bus.  FIXME: At the moment we do nothing. */
+fastcall void
+smp_vic_sys_interrupt(struct pt_regs *regs)
+{
+        ack_CPI(VIC_SYS_INT);
+        printk("Voyager SYSTEM INTERRUPT\n");
+}
+
+/* Handle a voyager CMN_INT; These interrupts occur either because of
+ * a system status change or because a single bit memory error
+ * occurred.  FIXME: At the moment, ignore all this. */
+fastcall void
+smp_vic_cmn_interrupt(struct pt_regs *regs)
+{
+        static __u8 in_cmn_int = 0;
+        static DEFINE_SPINLOCK(cmn_int_lock);
+
+        /* common ints are broadcast, so make sure we only do this once */
+        _raw_spin_lock(&cmn_int_lock);
+        if(in_cmn_int)
+                goto unlock_end;
+
+        in_cmn_int++;
+        _raw_spin_unlock(&cmn_int_lock);
+
+        VDEBUG(("Voyager COMMON INTERRUPT\n"));
+
+        if(voyager_level == 5)
+                voyager_cat_do_common_interrupt();
+
+        _raw_spin_lock(&cmn_int_lock);
+        in_cmn_int = 0;
+ unlock_end:
+        _raw_spin_unlock(&cmn_int_lock);
+        ack_CPI(VIC_CMN_INT);
+}
+
+/*
+ * Reschedule call back. Nothing to do, all the work is done
+ * automatically when we return from the interrupt.  */
+static void
+smp_reschedule_interrupt(void)
+{
+        /* do nothing */
+}
+
+static struct mm_struct * flush_mm;
+static unsigned long flush_va;
+static DEFINE_SPINLOCK(tlbstate_lock);
+#define FLUSH_ALL       0xffffffff
+
+/*
+ * We cannot call mmdrop() because we are in interrupt context, 
+ * instead update mm->cpu_vm_mask.
+ *
+ * We need to reload %cr3 since the page tables may be going
+ * away from under us..
+ */
+static inline void
+leave_mm (unsigned long cpu)
+{
+        if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK)
+                BUG();
+        cpu_clear(cpu, per_cpu(cpu_tlbstate, cpu).active_mm->cpu_vm_mask);
+        load_cr3(swapper_pg_dir);
+}
+
+
+/*
+ * Invalidate call-back
+ */
+static void 
+smp_invalidate_interrupt(void)
+{
+        __u8 cpu = smp_processor_id();
+
+        if (!test_bit(cpu, &smp_invalidate_needed))
+                return;
+        /* This will flood messages.  Don't uncomment unless you see
+         * Problems with cross cpu invalidation
+        VDEBUG(("VOYAGER SMP: CPU%d received INVALIDATE_CPI\n",
+                smp_processor_id()));
+        */
+
+        if (flush_mm == per_cpu(cpu_tlbstate, cpu).active_mm) {
+                if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) {
+                        if (flush_va == FLUSH_ALL)
+                                local_flush_tlb();
+                        else
+                                __flush_tlb_one(flush_va);
+                } else
+                        leave_mm(cpu);
+        }
+        smp_mb__before_clear_bit();
+        clear_bit(cpu, &smp_invalidate_needed);
+        smp_mb__after_clear_bit();
+}
+
+/* All the new flush operations for 2.4 */
+
+
+/* This routine is called with a physical cpu mask */
+static void
+flush_tlb_others (unsigned long cpumask, struct mm_struct *mm,
+                                                unsigned long va)
+{
+        int stuck = 50000;
+
+        if (!cpumask)
+                BUG();
+        if ((cpumask & cpus_addr(cpu_online_map)[0]) != cpumask)
+                BUG();
+        if (cpumask & (1 << smp_processor_id()))
+                BUG();
+        if (!mm)
+                BUG();
+
+        spin_lock(&tlbstate_lock);
+        
+        flush_mm = mm;
+        flush_va = va;
+        atomic_set_mask(cpumask, &smp_invalidate_needed);
+        /*
+         * We have to send the CPI only to
+         * CPUs affected.
+         */
+        send_CPI(cpumask, VIC_INVALIDATE_CPI);
+
+        while (smp_invalidate_needed) {
+                mb();
+                if(--stuck == 0) {
+                        printk("***WARNING*** Stuck doing invalidate CPI (CPU%d)\n", smp_processor_id());
+                        break;
+                }
+        }
+
+        /* Uncomment only to debug invalidation problems
+        VDEBUG(("VOYAGER SMP: Completed invalidate CPI (CPU%d)\n", cpu));
+        */
+
+        flush_mm = NULL;
+        flush_va = 0;
+        spin_unlock(&tlbstate_lock);
+}
+
+void
+flush_tlb_current_task(void)
+{
+        struct mm_struct *mm = current->mm;
+        unsigned long cpu_mask;
+
+        preempt_disable();
+
+        cpu_mask = cpus_addr(mm->cpu_vm_mask)[0] & ~(1 << smp_processor_id());
+        local_flush_tlb();
+        if (cpu_mask)
+                flush_tlb_others(cpu_mask, mm, FLUSH_ALL);
+
+        preempt_enable();
+}
+
+
+void
+flush_tlb_mm (struct mm_struct * mm)
+{
+        unsigned long cpu_mask;
+
+        preempt_disable();
+
+        cpu_mask = cpus_addr(mm->cpu_vm_mask)[0] & ~(1 << smp_processor_id());
+
+        if (current->active_mm == mm) {
+                if (current->mm)
+                        local_flush_tlb();
+                else
+                        leave_mm(smp_processor_id());
+        }
+        if (cpu_mask)
+                flush_tlb_others(cpu_mask, mm, FLUSH_ALL);
+
+        preempt_enable();
+}
+
+void flush_tlb_page(struct vm_area_struct * vma, unsigned long va)
+{
+        struct mm_struct *mm = vma->vm_mm;
+        unsigned long cpu_mask;
+
+        preempt_disable();
+
+        cpu_mask = cpus_addr(mm->cpu_vm_mask)[0] & ~(1 << smp_processor_id());
+        if (current->active_mm == mm) {
+                if(current->mm)
+                        __flush_tlb_one(va);
+                 else
+                        leave_mm(smp_processor_id());
+        }
+
+        if (cpu_mask)
+                flush_tlb_others(cpu_mask, mm, va);
+
+        preempt_enable();
+}
+
+/* enable the requested IRQs */
+static void
+smp_enable_irq_interrupt(void)
+{
+        __u8 irq;
+        __u8 cpu = get_cpu();
+
+        VDEBUG(("VOYAGER SMP: CPU%d enabling irq mask 0x%x\n", cpu,
+               vic_irq_enable_mask[cpu]));
+
+        spin_lock(&vic_irq_lock);
+        for(irq = 0; irq < 16; irq++) {
+                if(vic_irq_enable_mask[cpu] & (1<<irq))
+                        enable_local_vic_irq(irq);
+        }
+        vic_irq_enable_mask[cpu] = 0;
+        spin_unlock(&vic_irq_lock);
+
+        put_cpu_no_resched();
+}
+        
+/*
+ *      CPU halt call-back
+ */
+static void
+smp_stop_cpu_function(void *dummy)
+{
+        VDEBUG(("VOYAGER SMP: CPU%d is STOPPING\n", smp_processor_id()));
+        cpu_clear(smp_processor_id(), cpu_online_map);
+        local_irq_disable();
+        for(;;)
+               __asm__("hlt");
+}
+
+static DEFINE_SPINLOCK(call_lock);
+
+struct call_data_struct {
+        void (*func) (void *info);
+        void *info;
+        volatile unsigned long started;
+        volatile unsigned long finished;
+        int wait;
+};
+
+static struct call_data_struct * call_data;
+
+/* execute a thread on a new CPU.  The function to be called must be
+ * previously set up.  This is used to schedule a function for
+ * execution on all CPU's - set up the function then broadcast a
+ * function_interrupt CPI to come here on each CPU */
+static void
+smp_call_function_interrupt(void)
+{
+        void (*func) (void *info) = call_data->func;
+        void *info = call_data->info;
+        /* must take copy of wait because call_data may be replaced
+         * unless the function is waiting for us to finish */
+        int wait = call_data->wait;
+        __u8 cpu = smp_processor_id();
+
+        /*
+         * Notify initiating CPU that I've grabbed the data and am
+         * about to execute the function
+         */
+        mb();
+        if(!test_and_clear_bit(cpu, &call_data->started)) {
+                /* If the bit wasn't set, this could be a replay */
+                printk(KERN_WARNING "VOYAGER SMP: CPU %d received call funtion with no call pending\n", cpu);
+                return;
+        }
+        /*
+         * At this point the info structure may be out of scope unless wait==1
+         */
+        irq_enter();
+        (*func)(info);
+        irq_exit();
+        if (wait) {
+                mb();
+                clear_bit(cpu, &call_data->finished);
+        }
+}
+
+/* Call this function on all CPUs using the function_interrupt above 
+    <func> The function to run. This must be fast and non-blocking.
+    <info> An arbitrary pointer to pass to the function.
+    <retry> If true, keep retrying until ready.
+    <wait> If true, wait until function has completed on other CPUs.
+    [RETURNS] 0 on success, else a negative status code. Does not return until
+    remote CPUs are nearly ready to execute <<func>> or are or have executed.
+*/
+int
+smp_call_function (void (*func) (void *info), void *info, int retry,
+                   int wait)
+{
+        struct call_data_struct data;
+        __u32 mask = cpus_addr(cpu_online_map)[0];
+
+        mask &= ~(1<<smp_processor_id());
+
+        if (!mask)
+                return 0;
+
+        /* Can deadlock when called with interrupts disabled */
+        WARN_ON(irqs_disabled());
+
+        data.func = func;
+        data.info = info;
+        data.started = mask;
+        data.wait = wait;
+        if (wait)
+                data.finished = mask;
+
+        spin_lock(&call_lock);
+        call_data = &data;
+        wmb();
+        /* Send a message to all other CPUs and wait for them to respond */
+        send_CPI_allbutself(VIC_CALL_FUNCTION_CPI);
+
+        /* Wait for response */
+        while (data.started)
+                barrier();
+
+        if (wait)
+                while (data.finished)
+                        barrier();
+
+        spin_unlock(&call_lock);
+
+        return 0;
+}
+
+/* Sorry about the name.  In an APIC based system, the APICs
+ * themselves are programmed to send a timer interrupt.  This is used
+ * by linux to reschedule the processor.  Voyager doesn't have this,
+ * so we use the system clock to interrupt one processor, which in
+ * turn, broadcasts a timer CPI to all the others --- we receive that
+ * CPI here.  We don't use this actually for counting so losing
+ * ticks doesn't matter 
+ *
+ * FIXME: For those CPU's which actually have a local APIC, we could
+ * try to use it to trigger this interrupt instead of having to
+ * broadcast the timer tick.  Unfortunately, all my pentium DYADs have
+ * no local APIC, so I can't do this
+ *
+ * This function is currently a placeholder and is unused in the code */
+fastcall void 
+smp_apic_timer_interrupt(struct pt_regs *regs)
+{
+        wrapper_smp_local_timer_interrupt(regs);
+}
+
+/* All of the QUAD interrupt GATES */
+fastcall void
+smp_qic_timer_interrupt(struct pt_regs *regs)
+{
+        ack_QIC_CPI(QIC_TIMER_CPI);
+        wrapper_smp_local_timer_interrupt(regs);
+}
+
+fastcall void
+smp_qic_invalidate_interrupt(struct pt_regs *regs)
+{
+        ack_QIC_CPI(QIC_INVALIDATE_CPI);
+        smp_invalidate_interrupt();
+}
+
+fastcall void
+smp_qic_reschedule_interrupt(struct pt_regs *regs)
+{
+        ack_QIC_CPI(QIC_RESCHEDULE_CPI);
+        smp_reschedule_interrupt();
+}
+
+fastcall void
+smp_qic_enable_irq_interrupt(struct pt_regs *regs)
+{
+        ack_QIC_CPI(QIC_ENABLE_IRQ_CPI);
+        smp_enable_irq_interrupt();
+}
+
+fastcall void
+smp_qic_call_function_interrupt(struct pt_regs *regs)
+{
+        ack_QIC_CPI(QIC_CALL_FUNCTION_CPI);
+        smp_call_function_interrupt();
+}
+
+fastcall void
+smp_vic_cpi_interrupt(struct pt_regs *regs)
+{
+        __u8 cpu = smp_processor_id();
+
+        if(is_cpu_quad())
+                ack_QIC_CPI(VIC_CPI_LEVEL0);
+        else
+                ack_VIC_CPI(VIC_CPI_LEVEL0);
+
+        if(test_and_clear_bit(VIC_TIMER_CPI, &vic_cpi_mailbox[cpu]))
+                wrapper_smp_local_timer_interrupt(regs);
+        if(test_and_clear_bit(VIC_INVALIDATE_CPI, &vic_cpi_mailbox[cpu]))
+                smp_invalidate_interrupt();
+        if(test_and_clear_bit(VIC_RESCHEDULE_CPI, &vic_cpi_mailbox[cpu]))
+                smp_reschedule_interrupt();
+        if(test_and_clear_bit(VIC_ENABLE_IRQ_CPI, &vic_cpi_mailbox[cpu]))
+                smp_enable_irq_interrupt();
+        if(test_and_clear_bit(VIC_CALL_FUNCTION_CPI, &vic_cpi_mailbox[cpu]))
+                smp_call_function_interrupt();
+}
+
+static void
+do_flush_tlb_all(void* info)
+{
+        unsigned long cpu = smp_processor_id();
+
+        __flush_tlb_all();
+        if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_LAZY)
+                leave_mm(cpu);
+}
+
+
+/* flush the TLB of every active CPU in the system */
+void
+flush_tlb_all(void)
+{
+        on_each_cpu(do_flush_tlb_all, 0, 1, 1);
+}
+
+/* used to set up the trampoline for other CPUs when the memory manager
+ * is sorted out */
+void __init
+smp_alloc_memory(void)
+{
+        trampoline_base = (__u32)alloc_bootmem_low_pages(PAGE_SIZE);
+        if(__pa(trampoline_base) >= 0x93000)
+                BUG();
+}
+
+/* send a reschedule CPI to one CPU by physical CPU number*/
+void
+smp_send_reschedule(int cpu)
+{
+        send_one_CPI(cpu, VIC_RESCHEDULE_CPI);
+}
+
+
+int
+hard_smp_processor_id(void)
+{
+        __u8 i;
+        __u8 cpumask = inb(VIC_PROC_WHO_AM_I);
+        if((cpumask & QUAD_IDENTIFIER) == QUAD_IDENTIFIER)
+                return cpumask & 0x1F;
+
+        for(i = 0; i < 8; i++) {
+                if(cpumask & (1<<i))
+                        return i;
+        }
+        printk("** WARNING ** Illegal cpuid returned by VIC: %d", cpumask);
+        return 0;
+}
+
+/* broadcast a halt to all other CPUs */
+void
+smp_send_stop(void)
+{
+        smp_call_function(smp_stop_cpu_function, NULL, 1, 1);
+}
+
+/* this function is triggered in time.c when a clock tick fires
+ * we need to re-broadcast the tick to all CPUs */
+void
+smp_vic_timer_interrupt(struct pt_regs *regs)
+{
+        send_CPI_allbutself(VIC_TIMER_CPI);
+        smp_local_timer_interrupt(regs);
+}
+
+static inline void
+wrapper_smp_local_timer_interrupt(struct pt_regs *regs)
+{
+        irq_enter();
+        smp_local_timer_interrupt(regs);
+        irq_exit();
+}
+
+/* local (per CPU) timer interrupt.  It does both profiling and
+ * process statistics/rescheduling.
+ *
+ * We do profiling in every local tick, statistics/rescheduling
+ * happen only every 'profiling multiplier' ticks. The default
+ * multiplier is 1 and it can be changed by writing the new multiplier
+ * value into /proc/profile.
+ */
+void
+smp_local_timer_interrupt(struct pt_regs * regs)
+{
+        int cpu = smp_processor_id();
+        long weight;
+
+        profile_tick(CPU_PROFILING, regs);
+        if (--per_cpu(prof_counter, cpu) <= 0) {
+                /*
+                 * The multiplier may have changed since the last time we got
+                 * to this point as a result of the user writing to
+                 * /proc/profile. In this case we need to adjust the APIC
+                 * timer accordingly.
+                 *
+                 * Interrupts are already masked off at this point.
+                 */
+                per_cpu(prof_counter,cpu) = per_cpu(prof_multiplier, cpu);
+                if (per_cpu(prof_counter, cpu) !=
+                                        per_cpu(prof_old_multiplier, cpu)) {
+                        /* FIXME: need to update the vic timer tick here */
+                        per_cpu(prof_old_multiplier, cpu) =
+                                                per_cpu(prof_counter, cpu);
+                }
+
+                update_process_times(user_mode(regs));
+        }
+
+        if( ((1<<cpu) & voyager_extended_vic_processors) == 0)
+                /* only extended VIC processors participate in
+                 * interrupt distribution */
+                return;
+
+        /*
+         * We take the 'long' return path, and there every subsystem
+         * grabs the apropriate locks (kernel lock/ irq lock).
+         *
+         * we might want to decouple profiling from the 'long path',
+         * and do the profiling totally in assembly.
+         *
+         * Currently this isn't too much of an issue (performance wise),
+         * we can take more than 100K local irqs per second on a 100 MHz P5.
+         */
+
+        if((++vic_tick[cpu] & 0x7) != 0)
+                return;
+        /* get here every 16 ticks (about every 1/6 of a second) */
+
+        /* Change our priority to give someone else a chance at getting
+         * the IRQ. The algorithm goes like this:
+         *
+         * In the VIC, the dynamically routed interrupt is always
+         * handled by the lowest priority eligible (i.e. receiving
+         * interrupts) CPU.  If >1 eligible CPUs are equal lowest, the
+         * lowest processor number gets it.
+         *
+         * The priority of a CPU is controlled by a special per-CPU
+         * VIC priority register which is 3 bits wide 0 being lowest
+         * and 7 highest priority..
+         *
+         * Therefore we subtract the average number of interrupts from
+         * the number we've fielded.  If this number is negative, we
+         * lower the activity count and if it is positive, we raise
+         * it.
+         *
+         * I'm afraid this still leads to odd looking interrupt counts:
+         * the totals are all roughly equal, but the individual ones
+         * look rather skewed.
+         *
+         * FIXME: This algorithm is total crap when mixed with SMP
+         * affinity code since we now try to even up the interrupt
+         * counts when an affinity binding is keeping them on a
+         * particular CPU*/
+        weight = (vic_intr_count[cpu]*voyager_extended_cpus
+                  - vic_intr_total) >> 4;
+        weight += 4;
+        if(weight > 7)
+                weight = 7;
+        if(weight < 0)
+                weight = 0;
+        
+        outb((__u8)weight, VIC_PRIORITY_REGISTER);
+
+#ifdef VOYAGER_DEBUG
+        if((vic_tick[cpu] & 0xFFF) == 0) {
+                /* print this message roughly every 25 secs */
+                printk("VOYAGER SMP: vic_tick[%d] = %lu, weight = %ld\n",
+                       cpu, vic_tick[cpu], weight);
+        }
+#endif
+}
+
+/* setup the profiling timer */
+int 
+setup_profiling_timer(unsigned int multiplier)
+{
+        int i;
+
+        if ( (!multiplier))
+                return -EINVAL;
+
+        /* 
+         * Set the new multiplier for each CPU. CPUs don't start using the
+         * new values until the next timer interrupt in which they do process
+         * accounting.
+         */
+        for (i = 0; i < NR_CPUS; ++i)
+                per_cpu(prof_multiplier, i) = multiplier;
+
+        return 0;
+}
+
+
+/*  The CPIs are handled in the per cpu 8259s, so they must be
+ *  enabled to be received: FIX: enabling the CPIs in the early
+ *  boot sequence interferes with bug checking; enable them later
+ *  on in smp_init */
+#define VIC_SET_GATE(cpi, vector) \
+        set_intr_gate((cpi) + VIC_DEFAULT_CPI_BASE, (vector))
+#define QIC_SET_GATE(cpi, vector) \
+        set_intr_gate((cpi) + QIC_DEFAULT_CPI_BASE, (vector))
+
+void __init
+smp_intr_init(void)
+{
+        int i;
+
+        /* initialize the per cpu irq mask to all disabled */
+        for(i = 0; i < NR_CPUS; i++)
+                vic_irq_mask[i] = 0xFFFF;
+
+        VIC_SET_GATE(VIC_CPI_LEVEL0, vic_cpi_interrupt);
+
+        VIC_SET_GATE(VIC_SYS_INT, vic_sys_interrupt);
+        VIC_SET_GATE(VIC_CMN_INT, vic_cmn_interrupt);
+
+        QIC_SET_GATE(QIC_TIMER_CPI, qic_timer_interrupt);
+        QIC_SET_GATE(QIC_INVALIDATE_CPI, qic_invalidate_interrupt);
+        QIC_SET_GATE(QIC_RESCHEDULE_CPI, qic_reschedule_interrupt);
+        QIC_SET_GATE(QIC_ENABLE_IRQ_CPI, qic_enable_irq_interrupt);
+        QIC_SET_GATE(QIC_CALL_FUNCTION_CPI, qic_call_function_interrupt);
+        
+
+        /* now put the VIC descriptor into the first 48 IRQs 
+         *
+         * This is for later: first 16 correspond to PC IRQs; next 16
+         * are Primary MC IRQs and final 16 are Secondary MC IRQs */
+        for(i = 0; i < 48; i++)
+                irq_desc[i].handler = &vic_irq_type;
+}
+
+/* send a CPI at level cpi to a set of cpus in cpuset (set 1 bit per
+ * processor to receive CPI */
+static void
+send_CPI(__u32 cpuset, __u8 cpi)
+{
+        int cpu;
+        __u32 quad_cpuset = (cpuset & voyager_quad_processors);
+
+        if(cpi < VIC_START_FAKE_CPI) {
+                /* fake CPI are only used for booting, so send to the 
+                 * extended quads as well---Quads must be VIC booted */
+                outb((__u8)(cpuset), VIC_CPI_Registers[cpi]);
+                return;
+        }
+        if(quad_cpuset)
+                send_QIC_CPI(quad_cpuset, cpi);
+        cpuset &= ~quad_cpuset;
+        cpuset &= 0xff;         /* only first 8 CPUs vaild for VIC CPI */
+        if(cpuset == 0)
+                return;
+        for_each_online_cpu(cpu) {
+                if(cpuset & (1<<cpu))
+                        set_bit(cpi, &vic_cpi_mailbox[cpu]);
+        }
+        if(cpuset)
+                outb((__u8)cpuset, VIC_CPI_Registers[VIC_CPI_LEVEL0]);
+}
+
+/* Acknowledge receipt of CPI in the QIC, clear in QIC hardware and
+ * set the cache line to shared by reading it.
+ *
+ * DON'T make this inline otherwise the cache line read will be
+ * optimised away
+ * */
+static int
+ack_QIC_CPI(__u8 cpi) {
+        __u8 cpu = hard_smp_processor_id();
+
+        cpi &= 7;
+
+        outb(1<<cpi, QIC_INTERRUPT_CLEAR1);
+        return voyager_quad_cpi_addr[cpu]->qic_cpi[cpi].cpi;
+}
+
+static void
+ack_special_QIC_CPI(__u8 cpi)
+{
+        switch(cpi) {
+        case VIC_CMN_INT:
+                outb(QIC_CMN_INT, QIC_INTERRUPT_CLEAR0);
+                break;
+        case VIC_SYS_INT:
+                outb(QIC_SYS_INT, QIC_INTERRUPT_CLEAR0);
+                break;
+        }
+        /* also clear at the VIC, just in case (nop for non-extended proc) */
+        ack_VIC_CPI(cpi);
+}
+
+/* Acknowledge receipt of CPI in the VIC (essentially an EOI) */
+static void
+ack_VIC_CPI(__u8 cpi)
+{
+#ifdef VOYAGER_DEBUG
+        unsigned long flags;
+        __u16 isr;
+        __u8 cpu = smp_processor_id();
+
+        local_irq_save(flags);
+        isr = vic_read_isr();
+        if((isr & (1<<(cpi &7))) == 0) {
+                printk("VOYAGER SMP: CPU%d lost CPI%d\n", cpu, cpi);
+        }
+#endif
+        /* send specific EOI; the two system interrupts have
+         * bit 4 set for a separate vector but behave as the
+         * corresponding 3 bit intr */
+        outb_p(0x60|(cpi & 7),0x20);
+
+#ifdef VOYAGER_DEBUG
+        if((vic_read_isr() & (1<<(cpi &7))) != 0) {
+                printk("VOYAGER SMP: CPU%d still asserting CPI%d\n", cpu, cpi);
+        }
+        local_irq_restore(flags);
+#endif
+}
+
+/* cribbed with thanks from irq.c */
+#define __byte(x,y)     (((unsigned char *)&(y))[x])
+#define cached_21(cpu)  (__byte(0,vic_irq_mask[cpu]))
+#define cached_A1(cpu)  (__byte(1,vic_irq_mask[cpu]))
+
+static unsigned int
+startup_vic_irq(unsigned int irq)
+{
+        enable_vic_irq(irq);
+
+        return 0;
+}
+
+/* The enable and disable routines.  This is where we run into
+ * conflicting architectural philosophy.  Fundamentally, the voyager
+ * architecture does not expect to have to disable interrupts globally
+ * (the IRQ controllers belong to each CPU).  The processor masquerade
+ * which is used to start the system shouldn't be used in a running OS
+ * since it will cause great confusion if two separate CPUs drive to
+ * the same IRQ controller (I know, I've tried it).
+ *
+ * The solution is a variant on the NCR lazy SPL design:
+ *
+ * 1) To disable an interrupt, do nothing (other than set the
+ *    IRQ_DISABLED flag).  This dares the interrupt actually to arrive.
+ *
+ * 2) If the interrupt dares to come in, raise the local mask against
+ *    it (this will result in all the CPU masks being raised
+ *    eventually).
+ *
+ * 3) To enable the interrupt, lower the mask on the local CPU and
+ *    broadcast an Interrupt enable CPI which causes all other CPUs to
+ *    adjust their masks accordingly.  */
+
+static void
+enable_vic_irq(unsigned int irq)
+{
+        /* linux doesn't to processor-irq affinity, so enable on
+         * all CPUs we know about */
+        int cpu = smp_processor_id(), real_cpu;
+        __u16 mask = (1<<irq);
+        __u32 processorList = 0;
+        unsigned long flags;
+
+        VDEBUG(("VOYAGER: enable_vic_irq(%d) CPU%d affinity 0x%lx\n",
+                irq, cpu, cpu_irq_affinity[cpu]));
+        spin_lock_irqsave(&vic_irq_lock, flags);
+        for_each_online_cpu(real_cpu) {
+                if(!(voyager_extended_vic_processors & (1<<real_cpu)))
+                        continue;
+                if(!(cpu_irq_affinity[real_cpu] & mask)) {
+                        /* irq has no affinity for this CPU, ignore */
+                        continue;
+                }
+                if(real_cpu == cpu) {
+                        enable_local_vic_irq(irq);
+                }
+                else if(vic_irq_mask[real_cpu] & mask) {
+                        vic_irq_enable_mask[real_cpu] |= mask;
+                        processorList |= (1<<real_cpu);
+                }
+        }
+        spin_unlock_irqrestore(&vic_irq_lock, flags);
+        if(processorList)
+                send_CPI(processorList, VIC_ENABLE_IRQ_CPI);
+}
+
+static void
+disable_vic_irq(unsigned int irq)
+{
+        /* lazy disable, do nothing */
+}
+
+static void
+enable_local_vic_irq(unsigned int irq)
+{
+        __u8 cpu = smp_processor_id();
+        __u16 mask = ~(1 << irq);
+        __u16 old_mask = vic_irq_mask[cpu];
+
+        vic_irq_mask[cpu] &= mask;
+        if(vic_irq_mask[cpu] == old_mask)
+                return;
+
+        VDEBUG(("VOYAGER DEBUG: Enabling irq %d in hardware on CPU %d\n",
+                irq, cpu));
+
+        if (irq & 8) {
+                outb_p(cached_A1(cpu),0xA1);
+                (void)inb_p(0xA1);
+        }
+        else {
+                outb_p(cached_21(cpu),0x21);
+                (void)inb_p(0x21);
+        }
+}
+
+static void
+disable_local_vic_irq(unsigned int irq)
+{
+        __u8 cpu = smp_processor_id();
+        __u16 mask = (1 << irq);
+        __u16 old_mask = vic_irq_mask[cpu];
+
+        if(irq == 7)
+                return;
+
+        vic_irq_mask[cpu] |= mask;
+        if(old_mask == vic_irq_mask[cpu])
+                return;
+
+        VDEBUG(("VOYAGER DEBUG: Disabling irq %d in hardware on CPU %d\n",
+                irq, cpu));
+
+        if (irq & 8) {
+                outb_p(cached_A1(cpu),0xA1);
+                (void)inb_p(0xA1);
+        }
+        else {
+                outb_p(cached_21(cpu),0x21);
+                (void)inb_p(0x21);
+        }
+}
+
+/* The VIC is level triggered, so the ack can only be issued after the
+ * interrupt completes.  However, we do Voyager lazy interrupt
+ * handling here: It is an extremely expensive operation to mask an
+ * interrupt in the vic, so we merely set a flag (IRQ_DISABLED).  If
+ * this interrupt actually comes in, then we mask and ack here to push
+ * the interrupt off to another CPU */
+static void
+before_handle_vic_irq(unsigned int irq)
+{
+        irq_desc_t *desc = irq_desc + irq;
+        __u8 cpu = smp_processor_id();
+
+        _raw_spin_lock(&vic_irq_lock);
+        vic_intr_total++;
+        vic_intr_count[cpu]++;
+
+        if(!(cpu_irq_affinity[cpu] & (1<<irq))) {
+                /* The irq is not in our affinity mask, push it off
+                 * onto another CPU */
+                VDEBUG(("VOYAGER DEBUG: affinity triggered disable of irq %d on cpu %d\n",
+                        irq, cpu));
+                disable_local_vic_irq(irq);
+                /* set IRQ_INPROGRESS to prevent the handler in irq.c from
+                 * actually calling the interrupt routine */
+                desc->status |= IRQ_REPLAY | IRQ_INPROGRESS;
+        } else if(desc->status & IRQ_DISABLED) {
+                /* Damn, the interrupt actually arrived, do the lazy
+                 * disable thing. The interrupt routine in irq.c will
+                 * not handle a IRQ_DISABLED interrupt, so nothing more
+                 * need be done here */
+                VDEBUG(("VOYAGER DEBUG: lazy disable of irq %d on CPU %d\n",
+                        irq, cpu));
+                disable_local_vic_irq(irq);
+                desc->status |= IRQ_REPLAY;
+        } else {
+                desc->status &= ~IRQ_REPLAY;
+        }
+
+        _raw_spin_unlock(&vic_irq_lock);
+}
+
+/* Finish the VIC interrupt: basically mask */
+static void
+after_handle_vic_irq(unsigned int irq)
+{
+        irq_desc_t *desc = irq_desc + irq;
+
+        _raw_spin_lock(&vic_irq_lock);
+        {
+                unsigned int status = desc->status & ~IRQ_INPROGRESS;
+#ifdef VOYAGER_DEBUG
+                __u16 isr;
+#endif
+
+                desc->status = status;
+                if ((status & IRQ_DISABLED))
+                        disable_local_vic_irq(irq);
+#ifdef VOYAGER_DEBUG
+                /* DEBUG: before we ack, check what's in progress */
+                isr = vic_read_isr();
+                if((isr & (1<<irq) && !(status & IRQ_REPLAY)) == 0) {
+                        int i;
+                        __u8 cpu = smp_processor_id();
+                        __u8 real_cpu;
+                        int mask; /* Um... initialize me??? --RR */
+
+                        printk("VOYAGER SMP: CPU%d lost interrupt %d\n",
+                               cpu, irq);
+                        for_each_cpu(real_cpu, mask) {
+
+                                outb(VIC_CPU_MASQUERADE_ENABLE | real_cpu,
+                                     VIC_PROCESSOR_ID);
+                                isr = vic_read_isr();
+                                if(isr & (1<<irq)) {
+                                        printk("VOYAGER SMP: CPU%d ack irq %d\n",
+                                               real_cpu, irq);
+                                        ack_vic_irq(irq);
+                                }
+                                outb(cpu, VIC_PROCESSOR_ID);
+                        }
+                }
+#endif /* VOYAGER_DEBUG */
+                /* as soon as we ack, the interrupt is eligible for
+                 * receipt by another CPU so everything must be in
+                 * order here  */
+                ack_vic_irq(irq);
+                if(status & IRQ_REPLAY) {
+                        /* replay is set if we disable the interrupt
+                         * in the before_handle_vic_irq() routine, so
+                         * clear the in progress bit here to allow the
+                         * next CPU to handle this correctly */
+                        desc->status &= ~(IRQ_REPLAY | IRQ_INPROGRESS);
+                }
+#ifdef VOYAGER_DEBUG
+                isr = vic_read_isr();
+                if((isr & (1<<irq)) != 0)
+                        printk("VOYAGER SMP: after_handle_vic_irq() after ack irq=%d, isr=0x%x\n",
+                               irq, isr);
+#endif /* VOYAGER_DEBUG */
+        }
+        _raw_spin_unlock(&vic_irq_lock);
+
+        /* All code after this point is out of the main path - the IRQ
+         * may be intercepted by another CPU if reasserted */
+}
+
+
+/* Linux processor - interrupt affinity manipulations.
+ *
+ * For each processor, we maintain a 32 bit irq affinity mask.
+ * Initially it is set to all 1's so every processor accepts every
+ * interrupt.  In this call, we change the processor's affinity mask:
+ *
+ * Change from enable to disable:
+ *
+ * If the interrupt ever comes in to the processor, we will disable it
+ * and ack it to push it off to another CPU, so just accept the mask here.
+ *
+ * Change from disable to enable:
+ *
+ * change the mask and then do an interrupt enable CPI to re-enable on
+ * the selected processors */
+
+void
+set_vic_irq_affinity(unsigned int irq, cpumask_t mask)
+{
+        /* Only extended processors handle interrupts */
+        unsigned long real_mask;
+        unsigned long irq_mask = 1 << irq;
+        int cpu;
+
+        real_mask = cpus_addr(mask)[0] & voyager_extended_vic_processors;
+        
+        if(cpus_addr(mask)[0] == 0)
+                /* can't have no cpu's to accept the interrupt -- extremely
+                 * bad things will happen */
+                return;
+
+        if(irq == 0)
+                /* can't change the affinity of the timer IRQ.  This
+                 * is due to the constraint in the voyager
+                 * architecture that the CPI also comes in on and IRQ
+                 * line and we have chosen IRQ0 for this.  If you
+                 * raise the mask on this interrupt, the processor
+                 * will no-longer be able to accept VIC CPIs */
+                return;
+
+        if(irq >= 32) 
+                /* You can only have 32 interrupts in a voyager system
+                 * (and 32 only if you have a secondary microchannel
+                 * bus) */
+                return;
+
+        for_each_online_cpu(cpu) {
+                unsigned long cpu_mask = 1 << cpu;
+                
+                if(cpu_mask & real_mask) {
+                        /* enable the interrupt for this cpu */
+                        cpu_irq_affinity[cpu] |= irq_mask;
+                } else {
+                        /* disable the interrupt for this cpu */
+                        cpu_irq_affinity[cpu] &= ~irq_mask;
+                }
+        }
+        /* this is magic, we now have the correct affinity maps, so
+         * enable the interrupt.  This will send an enable CPI to
+         * those cpu's who need to enable it in their local masks,
+         * causing them to correct for the new affinity . If the
+         * interrupt is currently globally disabled, it will simply be
+         * disabled again as it comes in (voyager lazy disable).  If
+         * the affinity map is tightened to disable the interrupt on a
+         * cpu, it will be pushed off when it comes in */
+        enable_vic_irq(irq);
+}
+
+static void
+ack_vic_irq(unsigned int irq)
+{
+        if (irq & 8) {
+                outb(0x62,0x20);        /* Specific EOI to cascade */
+                outb(0x60|(irq & 7),0xA0);
+        } else {
+                outb(0x60 | (irq & 7),0x20);
+        }
+}
+
+/* enable the CPIs.  In the VIC, the CPIs are delivered by the 8259
+ * but are not vectored by it.  This means that the 8259 mask must be
+ * lowered to receive them */
+static __init void
+vic_enable_cpi(void)
+{
+        __u8 cpu = smp_processor_id();
+        
+        /* just take a copy of the current mask (nop for boot cpu) */
+        vic_irq_mask[cpu] = vic_irq_mask[boot_cpu_id];
+
+        enable_local_vic_irq(VIC_CPI_LEVEL0);
+        enable_local_vic_irq(VIC_CPI_LEVEL1);
+        /* for sys int and cmn int */
+        enable_local_vic_irq(7);
+
+        if(is_cpu_quad()) {
+                outb(QIC_DEFAULT_MASK0, QIC_MASK_REGISTER0);
+                outb(QIC_CPI_ENABLE, QIC_MASK_REGISTER1);
+                VDEBUG(("VOYAGER SMP: QIC ENABLE CPI: CPU%d: MASK 0x%x\n",
+                        cpu, QIC_CPI_ENABLE));
+        }
+
+        VDEBUG(("VOYAGER SMP: ENABLE CPI: CPU%d: MASK 0x%x\n",
+                cpu, vic_irq_mask[cpu]));
+}
+
+void
+voyager_smp_dump()
+{
+        int old_cpu = smp_processor_id(), cpu;
+
+        /* dump the interrupt masks of each processor */
+        for_each_online_cpu(cpu) {
+                __u16 imr, isr, irr;
+                unsigned long flags;
+
+                local_irq_save(flags);
+                outb(VIC_CPU_MASQUERADE_ENABLE | cpu, VIC_PROCESSOR_ID);
+                imr = (inb(0xa1) << 8) | inb(0x21);
+                outb(0x0a, 0xa0);
+                irr = inb(0xa0) << 8;
+                outb(0x0a, 0x20);
+                irr |= inb(0x20);
+                outb(0x0b, 0xa0);
+                isr = inb(0xa0) << 8;
+                outb(0x0b, 0x20);
+                isr |= inb(0x20);
+                outb(old_cpu, VIC_PROCESSOR_ID);
+                local_irq_restore(flags);
+                printk("\tCPU%d: mask=0x%x, IMR=0x%x, IRR=0x%x, ISR=0x%x\n",
+                       cpu, vic_irq_mask[cpu], imr, irr, isr);
+#if 0
+                /* These lines are put in to try to unstick an un ack'd irq */
+                if(isr != 0) {
+                        int irq;
+                        for(irq=0; irq<16; irq++) {
+                                if(isr & (1<<irq)) {
+                                        printk("\tCPU%d: ack irq %d\n",
+                                               cpu, irq);
+                                        local_irq_save(flags);
+                                        outb(VIC_CPU_MASQUERADE_ENABLE | cpu,
+                                             VIC_PROCESSOR_ID);
+                                        ack_vic_irq(irq);
+                                        outb(old_cpu, VIC_PROCESSOR_ID);
+                                        local_irq_restore(flags);
+                                }
+                        }
+                }
+#endif
+        }
+}
+
+void
+smp_voyager_power_off(void *dummy)
+{
+        if(smp_processor_id() == boot_cpu_id) 
+                voyager_power_off();
+        else
+                smp_stop_cpu_function(NULL);
+}
+
+void __init
+smp_prepare_cpus(unsigned int max_cpus)
+{
+        /* FIXME: ignore max_cpus for now */
+        smp_boot_cpus();
+}
+
+void __devinit smp_prepare_boot_cpu(void)
+{
+        cpu_set(smp_processor_id(), cpu_online_map);
+        cpu_set(smp_processor_id(), cpu_callout_map);
+}
+
+int __devinit
+__cpu_up(unsigned int cpu)
+{
+        /* This only works at boot for x86.  See "rewrite" above. */
+        if (cpu_isset(cpu, smp_commenced_mask))
+                return -ENOSYS;
+
+        /* In case one didn't come up */
+        if (!cpu_isset(cpu, cpu_callin_map))
+                return -EIO;
+        /* Unleash the CPU! */
+        cpu_set(cpu, smp_commenced_mask);
+        while (!cpu_isset(cpu, cpu_online_map))
+                mb();
+        return 0;
+}
+
+void __init 
+smp_cpus_done(unsigned int max_cpus)
+{
+        zap_low_mappings();
+}