patch-2.4.20 linux-2.4.20/arch/mips/sibyte/swarm/smp.c
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- Lines: 183
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
linux-2.4.19/arch/mips/sibyte/swarm/smp.c
- Orig date:
Fri Aug 2 17:39:43 2002
diff -urN linux-2.4.19/arch/mips/sibyte/swarm/smp.c linux-2.4.20/arch/mips/sibyte/swarm/smp.c
@@ -1,182 +0,0 @@
-/*
- * Copyright (C) 2001 Broadcom Corporation
- *
- * This program 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.
- *
- * This program 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 this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-
-#include <asm/sibyte/sb1250.h>
-#include <asm/sibyte/sb1250_regs.h>
-#include <asm/sibyte/sb1250_int.h>
-#include <asm/mipsregs.h>
-#include <asm/mmu_context.h>
-
-#include "cfe_xiocb.h"
-#include "cfe_api.h"
-
-extern void asmlinkage smp_bootstrap(void);
-
-/* Boot all other cpus in the system, initialize them, and
- bring them into the boot fn */
-int prom_boot_secondary(int cpu, unsigned long sp, unsigned long gp)
-{
- int retval;
-
- retval = cfe_start_cpu(cpu, &smp_bootstrap, sp, gp, 0);
- if (retval != 0) {
- printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
- return 0;
- } else {
- return 1;
- }
-}
-
-
-void prom_init_secondary(void)
-{
- /* Set up kseg0 to be cachable coherent */
- clear_cp0_config(CONF_CM_CMASK);
- set_cp0_config(0x5);
-
- /* Enable interrupts for lines 0-4 */
- clear_cp0_status(0xe000);
- set_cp0_status(0x1f01);
-}
-
-
-/*
- * Set up state, return the total number of cpus in the system, including
- * the master
- */
-int prom_setup_smp(void)
-{
- int i;
- int num_cpus = 1;
-
- /* Use CFE to find out how many CPUs are available */
- for (i=1; i<NR_CPUS; i++) {
- if (cfe_stop_cpu(i) == 0) {
- num_cpus++;
- }
- }
- printk("Detected %i available CPU(s)\n", num_cpus);
- return num_cpus;
-}
-
-void prom_smp_finish(void)
-{
- extern void sb1250_smp_finish(void);
- sb1250_smp_finish();
-}
-
-/*
- * XXX This is really halfway portable code and halfway system specific code.
- * XXX Seems like some of this is CPU-specific, too - rather than board/system.
- */
-extern atomic_t cpus_booted;
-
-void __init smp_boot_cpus(void)
-{
- int i;
- int cur_cpu = 0;
-
- smp_num_cpus = prom_setup_smp();
- init_new_context(current, &init_mm);
- current->processor = 0;
- cpu_data[0].udelay_val = loops_per_jiffy;
- cpu_data[0].asid_cache = ASID_FIRST_VERSION;
- CPUMASK_CLRALL(cpu_online_map);
- CPUMASK_SETB(cpu_online_map, 0);
- atomic_set(&cpus_booted, 1); /* Master CPU is already booted... */
- __cpu_number_map[0] = 0;
- __cpu_logical_map[0] = 0;
- init_idle();
-
- /*
- * This loop attempts to compensate for "holes" in the CPU
- * numbering. It's overkill, but general.
- */
- for (i = 1; i < smp_num_cpus; ) {
- struct task_struct *p;
- struct pt_regs regs;
- int retval;
- printk("Starting CPU %d... ", i);
-
- /* Spawn a new process normally. Grab a pointer to
- its task struct so we can mess with it */
- do_fork(CLONE_VM|CLONE_PID, 0, ®s, 0);
- p = init_task.prev_task;
-
- /* Schedule the first task manually */
- p->processor = i;
- p->cpus_runnable = 1 << i; /* we schedule the first task manually */
-
- /* Attach to the address space of init_task. */
- atomic_inc(&init_mm.mm_count);
- p->active_mm = &init_mm;
- init_tasks[i] = p;
-
- del_from_runqueue(p);
- unhash_process(p);
-
- do {
- /* Iterate until we find a CPU that comes up */
- cur_cpu++;
- retval = prom_boot_secondary(cur_cpu,
- (unsigned long)p + KERNEL_STACK_SIZE - 32,
- (unsigned long)p);
- __cpu_number_map[i] = i;
- __cpu_logical_map[i] = i;
- } while (!retval && (cur_cpu < NR_CPUS));
- if (retval) {
- i++;
- } else {
- panic("CPU discovery disaster");
- }
-
-#if 0
- /* This is copied from the ip-27 code in the mips64 tree */
-
- struct task_struct *p;
-
- /*
- * The following code is purely to make sure
- * Linux can schedule processes on this slave.
- */
- kernel_thread(0, NULL, CLONE_PID);
- p = init_task.prev_task;
- sprintf(p->comm, "%s%d", "Idle", i);
- init_tasks[i] = p;
- p->processor = i;
- p->cpus_runnable = 1 << i; /* we schedule the first task manually */
- del_from_runqueue(p);
- unhash_process(p);
- /* Attach to the address space of init_task. */
- atomic_inc(&init_mm.mm_count);
- p->active_mm = &init_mm;
- prom_boot_secondary(i,
- (unsigned long)p + KERNEL_STACK_SIZE - 32,
- (unsigned long)p);
-#endif
- }
-
- /* Wait for everyone to come up */
- while (atomic_read(&cpus_booted) != smp_num_cpus);
-
- smp_threads_ready = 1;
-}
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