1 files changed, 225 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip27/ip27-smp.c b/arch/mips/sgi-ip27/ip27-smp.c
new file mode 100644
index 000000000000..17f768cba94f
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-smp.c
@@ -0,0 +1,225 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
+ * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
+ */
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/nodemask.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/gda.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/klconfig.h>
+#include <asm/sn/launch.h>
+#include <asm/sn/mapped_kernel.h>
+#include <asm/sn/sn_private.h>
+#include <asm/sn/types.h>
+#include <asm/sn/sn0/hubpi.h>
+#include <asm/sn/sn0/hubio.h>
+#include <asm/sn/sn0/ip27.h>
+
+/*
+ * Takes as first input the PROM assigned cpu id, and the kernel
+ * assigned cpu id as the second.
+ */
+static void alloc_cpupda(cpuid_t cpu, int cpunum)
+{
+        cnodeid_t node = get_cpu_cnode(cpu);
+        nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
+
+        cputonasid(cpunum) = nasid;
+        cpu_data[cpunum].p_nodeid = node;
+        cputoslice(cpunum) = get_cpu_slice(cpu);
+}
+
+static nasid_t get_actual_nasid(lboard_t *brd)
+{
+        klhub_t *hub;
+
+        if (!brd)
+                return INVALID_NASID;
+
+        /* find out if we are a completely disabled brd. */
+        hub  = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
+        if (!hub)
+                return INVALID_NASID;
+        if (!(hub->hub_info.flags & KLINFO_ENABLE))     /* disabled node brd */
+                return hub->hub_info.physid;
+        else
+                return brd->brd_nasid;
+}
+
+static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
+{
+        static int tot_cpus_found = 0;
+        lboard_t *brd;
+        klcpu_t *acpu;
+        int cpus_found = 0;
+        cpuid_t cpuid;
+
+        brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
+
+        do {
+                acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
+                while (acpu) {
+                        cpuid = acpu->cpu_info.virtid;
+                        /* cnode is not valid for completely disabled brds */
+                        if (get_actual_nasid(brd) == brd->brd_nasid)
+                                cpuid_to_compact_node[cpuid] = cnode;
+                        if (cpuid > highest)
+                                highest = cpuid;
+                        /* Only let it join in if it's marked enabled */
+                        if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
+                            (tot_cpus_found != NR_CPUS)) {
+                                cpu_set(cpuid, phys_cpu_present_map);
+                                alloc_cpupda(cpuid, tot_cpus_found);
+                                cpus_found++;
+                                tot_cpus_found++;
+                        }
+                        acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
+                                                                KLSTRUCT_CPU);
+                }
+                brd = KLCF_NEXT(brd);
+                if (!brd)
+                        break;
+
+                brd = find_lboard(brd, KLTYPE_IP27);
+        } while (brd);
+
+        return highest;
+}
+
+void cpu_node_probe(void)
+{
+        int i, highest = 0;
+        gda_t *gdap = GDA;
+
+        /*
+         * Initialize the arrays to invalid nodeid (-1)
+         */
+        for (i = 0; i < MAX_COMPACT_NODES; i++)
+                compact_to_nasid_node[i] = INVALID_NASID;
+        for (i = 0; i < MAX_NASIDS; i++)
+                nasid_to_compact_node[i] = INVALID_CNODEID;
+        for (i = 0; i < MAXCPUS; i++)
+                cpuid_to_compact_node[i] = INVALID_CNODEID;
+
+        /*
+         * MCD - this whole "compact node" stuff can probably be dropped,
+         * as we can handle sparse numbering now
+         */
+        nodes_clear(node_online_map);
+        for (i = 0; i < MAX_COMPACT_NODES; i++) {
+                nasid_t nasid = gdap->g_nasidtable[i];
+                if (nasid == INVALID_NASID)
+                        break;
+                compact_to_nasid_node[i] = nasid;
+                nasid_to_compact_node[nasid] = i;
+                node_set_online(num_online_nodes());
+                highest = do_cpumask(i, nasid, highest);
+        }
+
+        printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
+}
+
+static void intr_clear_bits(nasid_t nasid, volatile hubreg_t *pend,
+        int base_level)
+{
+        volatile hubreg_t bits;
+        int i;
+
+        /* Check pending interrupts */
+        if ((bits = HUB_L(pend)) != 0)
+                for (i = 0; i < N_INTPEND_BITS; i++)
+                        if (bits & (1 << i))
+                                LOCAL_HUB_CLR_INTR(base_level + i);
+}
+
+static void intr_clear_all(nasid_t nasid)
+{
+        REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
+        REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
+        REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
+        REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
+        intr_clear_bits(nasid, REMOTE_HUB_ADDR(nasid, PI_INT_PEND0),
+                        INT_PEND0_BASELVL);
+        intr_clear_bits(nasid, REMOTE_HUB_ADDR(nasid, PI_INT_PEND1),
+                        INT_PEND1_BASELVL);
+}
+
+void __init prom_prepare_cpus(unsigned int max_cpus)
+{
+        cnodeid_t       cnode;
+
+        for_each_online_node(cnode)
+                intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
+
+        replicate_kernel_text();
+
+        /*
+         * Assumption to be fixed: we're always booted on logical / physical
+         * processor 0.  While we're always running on logical processor 0
+         * this still means this is physical processor zero; it might for
+         * example be disabled in the firwware.
+         */
+        alloc_cpupda(0, 0);
+}
+
+/*
+ * Launch a slave into smp_bootstrap().  It doesn't take an argument, and we
+ * set sp to the kernel stack of the newly created idle process, gp to the proc
+ * struct so that current_thread_info() will work.
+ */
+void __init prom_boot_secondary(int cpu, struct task_struct *idle)
+{
+        unsigned long gp = (unsigned long) idle->thread_info;
+        unsigned long sp = gp + THREAD_SIZE - 32;
+
+        LAUNCH_SLAVE(cputonasid(cpu),cputoslice(cpu),
+                (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
+                0, (void *) sp, (void *) gp);
+}
+
+void prom_init_secondary(void)
+{
+        per_cpu_init();
+        local_irq_enable();
+}
+
+void __init prom_cpus_done(void)
+{
+}
+
+void prom_smp_finish(void)
+{
+}
+
+void core_send_ipi(int destid, unsigned int action)
+{
+        int irq;
+
+        switch (action) {
+        case SMP_RESCHEDULE_YOURSELF:
+                irq = CPU_RESCHED_A_IRQ;
+                break;
+        case SMP_CALL_FUNCTION:
+                irq = CPU_CALL_A_IRQ;
+                break;
+        default:
+                panic("sendintr");
+        }
+
+        irq += cputoslice(destid);
+
+        /*
+         * Convert the compact hub number to the NASID to get the correct
+         * part of the address space.  Then set the interrupt bit associated
+         * with the CPU we want to send the interrupt to.
+         */
+        REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
+}