Linux-2.6.12-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!
diff --git a/arch/mips/sgi-ip27/ip27-smp.c b/arch/mips/sgi-ip27/ip27-smp.c
new file mode 100644
index 0000000..17f768c
--- /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);
+}