--- /dev/null
+/*
+ * arch/ubicom32/kernel/smp.c
+ * SMP implementation for Ubicom32 processors.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org>
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port. If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ * arch/m68knommu
+ * arch/blackfin
+ * arch/parisc
+ */
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/kernel_stat.h>
+#include <linux/mm.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/cpu.h>
+#include <linux/profile.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/irq.h>
+
+#include <asm/system.h>
+#include <asm/atomic.h>
+#include <asm/current.h>
+#include <asm/tlbflush.h>
+#include <asm/timex.h>
+#include <asm/cpu.h>
+#include <asm/irq.h>
+#include <asm/processor.h>
+#include <asm/thread.h>
+#include <asm/sections.h>
+#include <asm/ip5000.h>
+
+/*
+ * Mask the debug printout for IPI because they are too verbose
+ * for regular debugging.
+ */
+
+// #define DEBUG_SMP 1
+#if !defined(DEBUG_SMP)
+#define smp_debug(lvl, ...)
+#else
+static unsigned int smp_debug_lvl = 50;
+#define smp_debug(lvl, printargs...) \
+ if (lvl >= smp_debug_lvl) { \
+ printk(printargs); \
+ }
+#endif
+
+#if !defined(DEBUG_SMP)
+#define DEBUG_ASSERT(cond)
+#else
+#define DEBUG_ASSERT(cond) \
+ if (!(cond)) { \
+ THREAD_STALL; \
+ }
+#endif
+
+/*
+ * List of IPI Commands (more than one can be set at a time).
+ */
+enum ipi_message_type {
+ IPI_NOP,
+ IPI_RESCHEDULE,
+ IPI_CALL_FUNC,
+ IPI_CALL_FUNC_SINGLE,
+ IPI_CPU_STOP,
+ IPI_CPU_TIMER,
+};
+
+/*
+ * We maintain a hardware thread oriented view of online threads
+ * and those involved or needing IPI.
+ */
+static volatile unsigned long smp_online_threads = 0;
+static volatile unsigned long smp_needs_ipi = 0;
+static volatile unsigned long smp_inside_ipi = 0;
+static unsigned long smp_irq_affinity[NR_IRQS];
+
+/*
+ * What do we need to track on a per cpu/thread basis?
+ */
+DEFINE_PER_CPU(struct cpuinfo_ubicom32, cpu_data);
+
+/*
+ * Each thread cpuinfo IPI information is guarded by a lock
+ * that is kept local to this file.
+ */
+DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED;
+
+/*
+ * The IPI(s) are based on a software IRQ through the LDSR.
+ */
+unsigned int smp_ipi_irq;
+
+/*
+ * Define a spinlock so that only one cpu is able to modify the
+ * smp_needs_ipi and to set/clear the IRQ at a time.
+ */
+DEFINE_SPINLOCK(smp_ipi_lock);
+
+/*
+ * smp_halt_processor()
+ * Halt this hardware thread.
+ */
+static void smp_halt_processor(void)
+{
+ int cpuid = thread_get_self();
+ cpu_clear(smp_processor_id(), cpu_online_map);
+ local_irq_disable();
+ printk(KERN_EMERG "cpu[%d] has halted. It is not OK to turn off power \
+ until all cpu's are off.\n", cpuid);
+ for (;;) {
+ thread_suspend();
+ }
+}
+
+/*
+ * ipi_interrupt()
+ * Handle an Interprocessor Interrupt.
+ */
+static irqreturn_t ipi_interrupt(int irq, void *dev_id)
+{
+ int cpuid = smp_processor_id();
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, cpuid);
+ unsigned long ops;
+
+ /*
+ * Count this now; we may make a call that never returns.
+ */
+ p->ipi_count++;
+
+ /*
+ * We are about to process all ops. If another cpu has stated
+ * that we need an IPI, we will have already processed it. By
+ * clearing our smp_needs_ipi, and processing all ops,
+ * we reduce the number of IPI interrupts. However, this introduces
+ * the possibility that smp_needs_ipi will be clear and the soft irq
+ * will have gone off; so we need to make the get_affinity() path
+ * tolerant of spurious interrupts.
+ */
+ spin_lock(&smp_ipi_lock);
+ smp_needs_ipi &= ~(1 << p->tid);
+ spin_unlock(&smp_ipi_lock);
+
+ for (;;) {
+ /*
+ * Read the set of IPI commands we should handle.
+ */
+ spinlock_t *lock = &per_cpu(ipi_lock, cpuid);
+ spin_lock(lock);
+ ops = p->ipi_pending;
+ p->ipi_pending = 0;
+ spin_unlock(lock);
+
+ /*
+ * If we have no IPI commands to execute, break out.
+ */
+ if (!ops) {
+ break;
+ }
+
+ /*
+ * Execute the set of commands in the ops word, one command
+ * at a time in no particular order. Strip of each command
+ * as we execute it.
+ */
+ while (ops) {
+ unsigned long which = ffz(~ops);
+ ops &= ~(1 << which);
+
+ BUG_ON(!irqs_disabled());
+ switch (which) {
+ case IPI_NOP:
+ smp_debug(100, KERN_INFO "cpu[%d]: "
+ "IPI_NOP\n", cpuid);
+ break;
+
+ case IPI_RESCHEDULE:
+ /*
+ * Reschedule callback. Everything to be
+ * done is done by the interrupt return path.
+ */
+ smp_debug(200, KERN_INFO "cpu[%d]: "
+ "IPI_RESCHEDULE\n", cpuid);
+ break;
+
+ case IPI_CALL_FUNC:
+ smp_debug(100, KERN_INFO "cpu[%d]: "
+ "IPI_CALL_FUNC\n", cpuid);
+ generic_smp_call_function_interrupt();
+ break;
+
+ case IPI_CALL_FUNC_SINGLE:
+ smp_debug(100, KERN_INFO "cpu[%d]: "
+ "IPI_CALL_FUNC_SINGLE\n", cpuid);
+ generic_smp_call_function_single_interrupt();
+ break;
+
+ case IPI_CPU_STOP:
+ smp_debug(100, KERN_INFO "cpu[%d]: "
+ "IPI_CPU_STOP\n", cpuid);
+ smp_halt_processor();
+ break;
+
+#if !defined(CONFIG_LOCAL_TIMERS)
+ case IPI_CPU_TIMER:
+ smp_debug(100, KERN_INFO "cpu[%d]: "
+ "IPI_CPU_TIMER\n", cpuid);
+#if defined(CONFIG_GENERIC_CLOCKEVENTS)
+ local_timer_interrupt();
+#else
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
+#endif
+#endif
+ break;
+
+ default:
+ printk(KERN_CRIT "cpu[%d]: "
+ "Unknown IPI: %lu\n", cpuid, which);
+
+ return IRQ_NONE;
+ }
+
+ /*
+ * Let in any pending interrupts
+ */
+ BUG_ON(!irqs_disabled());
+ local_irq_enable();
+ local_irq_disable();
+ }
+ }
+ return IRQ_HANDLED;
+}
+
+/*
+ * ipi_send()
+ * Send an Interprocessor Interrupt.
+ */
+static void ipi_send(int cpu, enum ipi_message_type op)
+{
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, cpu);
+ spinlock_t *lock = &per_cpu(ipi_lock, cpu);
+ unsigned long flags;
+
+ /*
+ * We protect the setting of the ipi_pending field and ensure
+ * that the ipi delivery mechanism and interrupt are atomically
+ * handled.
+ */
+ spin_lock_irqsave(lock, flags);
+ p->ipi_pending |= 1 << op;
+ spin_unlock_irqrestore(lock, flags);
+
+ spin_lock_irqsave(&smp_ipi_lock, flags);
+ smp_needs_ipi |= (1 << p->tid);
+ ubicom32_set_interrupt(smp_ipi_irq);
+ spin_unlock_irqrestore(&smp_ipi_lock, flags);
+ smp_debug(100, KERN_INFO "cpu[%d]: send: %d\n", cpu, op);
+}
+
+/*
+ * ipi_send_mask
+ * Send an IPI to each cpu in mask.
+ */
+static inline void ipi_send_mask(unsigned int op, const struct cpumask mask)
+{
+ int cpu;
+ for_each_cpu_mask(cpu, mask) {
+ ipi_send(cpu, op);
+ }
+}
+
+/*
+ * ipi_send_allbutself()
+ * Send an IPI to all threads but ourselves.
+ */
+static inline void ipi_send_allbutself(unsigned int op)
+{
+ int self = smp_processor_id();
+ struct cpumask result;
+ cpumask_copy(&result, &cpu_online_map);
+ cpu_clear(self, result);
+ ipi_send_mask(op, result);
+}
+
+/*
+ * smp_enable_vector()
+ */
+static void smp_enable_vector(unsigned int irq)
+{
+ ubicom32_clear_interrupt(smp_ipi_irq);
+ ldsr_enable_vector(irq);
+}
+
+/*
+ * smp_disable_vector()
+ * Disable the interrupt by clearing the appropriate bit in the
+ * LDSR Mask Register.
+ */
+static void smp_disable_vector(unsigned int irq)
+{
+ ldsr_disable_vector(irq);
+}
+
+/*
+ * smp_mask_vector()
+ */
+static void smp_mask_vector(unsigned int irq)
+{
+ ldsr_mask_vector(irq);
+}
+
+/*
+ * smp_unmask_vector()
+ */
+static void smp_unmask_vector(unsigned int irq)
+{
+ ldsr_unmask_vector(irq);
+}
+
+/*
+ * smp_end_vector()
+ * Called once an interrupt is completed (reset the LDSR mask).
+ */
+static void smp_end_vector(unsigned int irq)
+{
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, smp_processor_id());
+ spin_lock(&smp_ipi_lock);
+ smp_inside_ipi &= ~(1 << p->tid);
+ if (smp_inside_ipi) {
+ spin_unlock(&smp_ipi_lock);
+ return;
+ }
+ spin_unlock(&smp_ipi_lock);
+ ldsr_unmask_vector(irq);
+ smp_debug(100, KERN_INFO "cpu[%d]: unamesk vector\n", smp_processor_id());
+}
+
+/*
+ * Special hanlder functions for SMP.
+ */
+static struct irq_chip ubicom32_smp_chip = {
+ .name = "UbicoIPI",
+ .startup = NULL,
+ .shutdown = NULL,
+ .enable = smp_enable_vector,
+ .disable = smp_disable_vector,
+ .ack = NULL,
+ .mask = smp_mask_vector,
+ .unmask = smp_unmask_vector,
+ .end = smp_end_vector,
+};
+
+/*
+ * smp_reset_ipi()
+ * None of these cpu(s) got their IPI, turn it back on.
+ *
+ * Note: This is called by the LDSR which is not a full
+ * Linux cpu. Thus you must use the raw form of locks
+ * because lock debugging will not work on the partial
+ * cpu nature of the LDSR.
+ */
+void smp_reset_ipi(unsigned long mask)
+{
+ __raw_spin_lock(&smp_ipi_lock.raw_lock);
+ smp_needs_ipi |= mask;
+ smp_inside_ipi &= ~mask;
+ ubicom32_set_interrupt(smp_ipi_irq);
+ __raw_spin_unlock(&smp_ipi_lock.raw_lock);
+ smp_debug(100, KERN_INFO "smp: reset IPIs for: 0x%x\n", mask);
+}
+
+/*
+ * smp_get_affinity()
+ * Choose the thread affinity for this interrupt.
+ *
+ * Note: This is called by the LDSR which is not a full
+ * Linux cpu. Thus you must use the raw form of locks
+ * because lock debugging will not work on the partial
+ * cpu nature of the LDSR.
+ */
+unsigned long smp_get_affinity(unsigned int irq, int *all)
+{
+ unsigned long mask = 0;
+
+ /*
+ * Most IRQ(s) are delivered in a round robin fashion.
+ */
+ if (irq != smp_ipi_irq) {
+ unsigned long result = smp_irq_affinity[irq] & smp_online_threads;
+ DEBUG_ASSERT(result);
+ *all = 0;
+ return result;
+ }
+
+ /*
+ * This is an IPI request. Return all cpu(s) scheduled for an IPI.
+ * We also track those cpu(s) that are going to be "receiving" IPI this
+ * round. When all CPU(s) have called smp_end_vector(),
+ * we will unmask the IPI interrupt.
+ */
+ __raw_spin_lock(&smp_ipi_lock.raw_lock);
+ ubicom32_clear_interrupt(smp_ipi_irq);
+ if (smp_needs_ipi) {
+ mask = smp_needs_ipi;
+ smp_inside_ipi |= smp_needs_ipi;
+ smp_needs_ipi = 0;
+ }
+ __raw_spin_unlock(&smp_ipi_lock.raw_lock);
+ *all = 1;
+ return mask;
+}
+
+/*
+ * smp_set_affinity()
+ * Set the affinity for this irq but store the value in tid(s).
+ */
+void smp_set_affinity(unsigned int irq, const struct cpumask *dest)
+{
+ int cpuid;
+ unsigned long *paffinity = &smp_irq_affinity[irq];
+
+ /*
+ * If none specified, all cpus are allowed.
+ */
+ if (cpus_empty(*dest)) {
+ *paffinity = 0xffffffff;
+ return;
+ }
+
+ /*
+ * Make sure to clear the old value before setting up the
+ * list.
+ */
+ *paffinity = 0;
+ for_each_cpu_mask(cpuid, *dest) {
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, cpuid);
+ *paffinity |= (1 << p->tid);
+ }
+}
+
+/*
+ * smp_send_stop()
+ * Send a stop request to all CPU but this one.
+ */
+void smp_send_stop(void)
+{
+ ipi_send_allbutself(IPI_CPU_STOP);
+}
+
+/*
+ * smp_send_timer_all()
+ * Send all cpu(s) but this one, a request to update times.
+ */
+void smp_send_timer_all(void)
+{
+ ipi_send_allbutself(IPI_CPU_TIMER);
+}
+
+/*
+ * smp_timer_broadcast()
+ * Use an IPI to broadcast a timer message
+ */
+void smp_timer_broadcast(const struct cpumask *mask)
+{
+ ipi_send_mask(IPI_CPU_TIMER, *mask);
+}
+
+/*
+ * smp_send_reschedule()
+ * Send a reschedule request to the specified cpu.
+ */
+void smp_send_reschedule(int cpu)
+{
+ ipi_send(cpu, IPI_RESCHEDULE);
+}
+
+/*
+ * arch_send_call_function_ipi()
+ * Cause each cpu in the mask to call the generic function handler.
+ */
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
+{
+ int cpu;
+ for_each_cpu_mask(cpu, *mask) {
+ ipi_send(cpu, IPI_CALL_FUNC);
+ }
+}
+
+/*
+ * arch_send_call_function_single_ipi()
+ * Cause the specified cpu to call the generic function handler.
+ */
+void arch_send_call_function_single_ipi(int cpu)
+{
+ ipi_send(cpu, IPI_CALL_FUNC_SINGLE);
+}
+
+/*
+ * setup_profiling_timer()
+ * Dummy function created to keep Oprofile happy in the SMP case.
+ */
+int setup_profiling_timer(unsigned int multiplier)
+{
+ return 0;
+}
+
+/*
+ * smp_mainline_start()
+ * Start a slave thread executing a mainline Linux context.
+ */
+static void __init smp_mainline_start(void *arg)
+{
+ int cpuid = smp_processor_id();
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, cpuid);
+
+ BUG_ON(p->tid != thread_get_self());
+
+ /*
+ * Well, support 2.4 linux scheme as well.
+ */
+ if (cpu_test_and_set(cpuid, cpu_online_map)) {
+ printk(KERN_CRIT "cpu[%d]: already initialized!\n", cpuid);
+ smp_halt_processor();
+ return;
+ }
+
+ /*
+ * Initialise the idle task for this CPU
+ */
+ atomic_inc(&init_mm.mm_count);
+ current->active_mm = &init_mm;
+ if (current->mm) {
+ printk(KERN_CRIT "cpu[%d]: idle task already has memory "
+ "management\n", cpuid);
+ smp_halt_processor();
+ return;
+ }
+
+ /*
+ * TODO: X86 does this prior to calling notify, try to understand why?
+ */
+ preempt_disable();
+
+#if defined(CONFIG_GENERIC_CLOCKEVENTS)
+ /*
+ * Setup a local timer event so that this cpu will get timer interrupts
+ */
+ if (local_timer_setup(cpuid) == -1) {
+ printk(KERN_CRIT "cpu[%d]: timer alloc failed\n", cpuid);
+ smp_halt_processor();
+ return;
+ }
+#endif
+
+ /*
+ * Notify those interested that we are up and alive. This must
+ * be done before interrupts are enabled. It must also be completed
+ * before the bootstrap cpu returns from __cpu_up() (see comment
+ * above cpu_set() of the cpu_online_map).
+ */
+ notify_cpu_starting(cpuid);
+
+ /*
+ * Indicate that this thread is now online and present. Setting
+ * cpu_online_map has the side effect of allowing the bootstrap
+ * cpu to continue along; so anything that MUST be done prior to the
+ * bootstrap cpu returning from __cpu_up() needs to go above here.
+ */
+ cpu_set(cpuid, cpu_online_map);
+ cpu_set(cpuid, cpu_present_map);
+
+ /*
+ * Maintain a thread mapping in addition to the cpu mapping.
+ */
+ smp_online_threads |= (1 << p->tid);
+
+ /*
+ * Enable interrupts for this thread.
+ */
+ local_irq_enable();
+
+ /*
+ * Enter the idle loop and wait for a timer to schedule some work.
+ */
+ printk(KERN_INFO "cpu[%d]: entering cpu_idle()\n", cpuid);
+ cpu_idle();
+
+ /* Not Reached */
+}
+
+/*
+ * smp_cpus_done()
+ * Called once the kernel_init() has brought up all cpu(s).
+ */
+void smp_cpus_done(unsigned int cpu_max)
+{
+ /* Do Nothing */
+}
+
+/*
+ * __cpu_up()
+ * Called to startup a sepcific cpu.
+ */
+int __cpuinit __cpu_up(unsigned int cpu)
+{
+ struct task_struct *idle;
+ unsigned int *stack;
+ long timeout;
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, cpu);
+
+ /*
+ * Create an idle task for this CPU.
+ */
+ idle = fork_idle(cpu);
+ if (IS_ERR(idle)) {
+ panic("cpu[%d]: fork failed\n", cpu);
+ return -ENOSYS;
+ }
+ task_thread_info(idle)->cpu = cpu;
+
+ /*
+ * Setup the sw_ksp[] to point to this new task.
+ */
+ sw_ksp[p->tid] = (unsigned int)idle->stack;
+ stack = (unsigned int *)(sw_ksp[p->tid] + PAGE_SIZE - 8);
+
+ /*
+ * Cause the specified thread to execute our smp_mainline_start
+ * function as a TYPE_NORMAL thread.
+ */
+ printk(KERN_INFO "cpu[%d]: launching mainline Linux thread\n", cpu);
+ if (thread_start(p->tid, smp_mainline_start, (void *)NULL, stack,
+ THREAD_TYPE_NORMAL) == -1) {
+ printk(KERN_WARNING "cpu[%d]: failed thread_start\n", cpu);
+ return -ENOSYS;
+ }
+
+ /*
+ * Wait for the thread to start up. The thread will set
+ * the online bit when it is running. Our caller execpts the
+ * cpu to be online if we return 0.
+ */
+ for (timeout = 0; timeout < 10000; timeout++) {
+ if (cpu_online(cpu)) {
+ break;
+ }
+
+ udelay(100);
+ barrier();
+ continue;
+ }
+
+ if (!cpu_online(cpu)) {
+ printk(KERN_CRIT "cpu[%d]: failed to live after %ld us\n",
+ cpu, timeout * 100);
+ return -ENOSYS;
+ }
+
+ printk(KERN_INFO "cpu[%d]: came alive after %ld us\n",
+ cpu, timeout * 100);
+ return 0;
+}
+
+/*
+ * Data used by setup_irq for the IPI.
+ */
+static struct irqaction ipi_irq = {
+ .name = "ipi",
+ .flags = IRQF_DISABLED | IRQF_PERCPU,
+ .handler = ipi_interrupt,
+};
+
+/*
+ * smp_prepare_cpus()
+ * Mark threads that are available to Linux as possible cpus(s).
+ */
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+ int i;
+
+ /*
+ * We will need a software IRQ to send IPI(s). We will use
+ * a single software IRQ for all IPI(s).
+ */
+ if (irq_soft_alloc(&smp_ipi_irq) < 0) {
+ panic("no software IRQ is available\n");
+ return;
+ }
+
+ /*
+ * For the IPI interrupt, we want to use our own chip definition.
+ * This allows us to define what happens in SMP IPI without affecting
+ * the performance of the other interrupts.
+ *
+ * Next, Register the IPI interrupt function against the soft IRQ.
+ */
+ set_irq_chip(smp_ipi_irq, &ubicom32_smp_chip);
+ setup_irq(smp_ipi_irq, &ipi_irq);
+
+ /*
+ * We use the device tree node to determine how many
+ * free cpus we will have (up to NR_CPUS) and we indicate
+ * that those cpus are present.
+ *
+ * We need to do this very early in the SMP case
+ * because the Linux init code uses the cpu_present_map.
+ */
+ for_each_possible_cpu(i) {
+ thread_t tid;
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, i);
+
+ /*
+ * Skip the bootstrap cpu
+ */
+ if (i == 0) {
+ continue;
+ }
+
+ /*
+ * If we have a free thread left in the mask,
+ * indicate that the cpu is present.
+ */
+ tid = thread_alloc();
+ if (tid == (thread_t)-1) {
+ break;
+ }
+
+ /*
+ * Save the hardware thread id for this cpu.
+ */
+ p->tid = tid;
+ cpu_set(i, cpu_present_map);
+ printk(KERN_INFO "cpu[%d]: added to cpu_present_map - tid: %d\n", i, tid);
+ }
+}
+
+/*
+ * smp_prepare_boot_cpu()
+ * Copy the per_cpu data into the appropriate spot for the bootstrap cpu.
+ *
+ * The code in boot_cpu_init() has already set the boot cpu's
+ * state in the possible, present, and online maps.
+ */
+void __devinit smp_prepare_boot_cpu(void)
+{
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, 0);
+
+ smp_online_threads |= (1 << p->tid);
+ printk(KERN_INFO "cpu[%d]: bootstrap CPU online - tid: %ld\n",
+ current_thread_info()->cpu, p->tid);
+}
+
+/*
+ * smp_setup_processor_id()
+ * Set the current_thread_info() structure cpu value.
+ *
+ * We set the value to the true hardware thread value that we are running on.
+ * NOTE: this function overrides the weak alias function in main.c
+ */
+void __init smp_setup_processor_id(void)
+{
+ struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, 0);
+ int i;
+ for_each_cpu_mask(i, CPU_MASK_ALL)
+ set_cpu_possible(i, true);
+
+ current_thread_info()->cpu = 0;
+ p->tid = thread_get_self();
+}
projects / openwrt / svn-archive / archive.git / blobdiff