release/src-rt-6.x/linux/linux-2.6/arch/mips/mips-boards/sim/sim_smp.c

   1 /*
   2  * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
   3  *
   4  *  This program is free software; you can distribute it and/or modify it
   5  *  under the terms of the GNU General Public License (Version 2) as
   6  *  published by the Free Software Foundation.
   7  *
   8  *  This program is distributed in the hope it will be useful, but WITHOUT
   9  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  *  for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License along
  14  *  with this program; if not, write to the Free Software Foundation, Inc.,
  15  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  *
  17  */
  18 /*
  19  * Simulator Platform-specific hooks for SMP operation
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/cpumask.h>
  24 #include <linux/interrupt.h>
  25 #include <asm/atomic.h>
  26 #include <asm/cpu.h>
  27 #include <asm/processor.h>
  28 #include <asm/system.h>
  29 #include <asm/hardirq.h>
  30 #include <asm/mmu_context.h>
  31 #include <asm/smp.h>
  32 #ifdef CONFIG_MIPS_MT_SMTC
  33 #include <asm/smtc_ipi.h>
  34 #endif /* CONFIG_MIPS_MT_SMTC */
  35
  36 /* VPE/SMP Prototype implements platform interfaces directly */
  37 #if !defined(CONFIG_MIPS_MT_SMP)
  38
  39 /*
  40  * Cause the specified action to be performed on a targeted "CPU"
  41  */
  42
  43 void core_send_ipi(int cpu, unsigned int action)
  44 {
  45 #ifdef CONFIG_MIPS_MT_SMTC
  46         smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
  47 #endif /* CONFIG_MIPS_MT_SMTC */
  48 /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
  49
  50 }
  51
  52 /*
  53  * Platform "CPU" startup hook
  54  */
  55
  56 void prom_boot_secondary(int cpu, struct task_struct *idle)
  57 {
  58 #ifdef CONFIG_MIPS_MT_SMTC
  59         smtc_boot_secondary(cpu, idle);
  60 #endif /* CONFIG_MIPS_MT_SMTC */
  61 }
  62
  63 /*
  64  * Post-config but pre-boot cleanup entry point
  65  */
  66
  67 void prom_init_secondary(void)
  68 {
  69 #ifdef CONFIG_MIPS_MT_SMTC
  70         void smtc_init_secondary(void);
  71
  72         smtc_init_secondary();
  73 #endif /* CONFIG_MIPS_MT_SMTC */
  74 }
  75
  76 /*
  77  * Platform SMP pre-initialization
  78  */
  79
  80 void prom_prepare_cpus(unsigned int max_cpus)
  81 {
  82 #ifdef CONFIG_MIPS_MT_SMTC
  83         /*
  84          * As noted above, we can assume a single CPU for now
  85          * but it may be multithreaded.
  86          */
  87
  88         if (read_c0_config3() & (1<<2)) {
  89                 mipsmt_prepare_cpus(max_cpus);
  90         }
  91 #endif /* CONFIG_MIPS_MT_SMTC */
  92 }
  93
  94 /*
  95  * SMP initialization finalization entry point
  96  */
  97
  98 void prom_smp_finish(void)
  99 {
 100 #ifdef CONFIG_MIPS_MT_SMTC
 101         smtc_smp_finish();
 102 #endif /* CONFIG_MIPS_MT_SMTC */
 103 }
 104
 105 /*
 106  * Hook for after all CPUs are online
 107  */
 108
 109 void prom_cpus_done(void)
 110 {
 111 #ifdef CONFIG_MIPS_MT_SMTC
 112
 113 #endif /* CONFIG_MIPS_MT_SMTC */
 114 }
 115 #endif /* CONFIG_MIPS32R2_MT_SMP */