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/config.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/cpumask.h>
  25 #include <linux/interrupt.h>
  26 #include <asm/atomic.h>
  27 #include <asm/cpu.h>
  28 #include <asm/processor.h>
  29 #include <asm/system.h>
  30 #include <asm/hardirq.h>
  31 #include <asm/mmu_context.h>
  32 #include <asm/smp.h>
  33 #ifdef CONFIG_MIPS_MT_SMTC
  34 #include <asm/smtc_ipi.h>
  35 #endif /* CONFIG_MIPS_MT_SMTC */
  36
  37 /* VPE/SMP Prototype implements platform interfaces directly */
  38 #if !defined(CONFIG_MIPS_MT_SMP)
  39
  40 /*
  41  * Cause the specified action to be performed on a targeted "CPU"
  42  */
  43
  44 void core_send_ipi(int cpu, unsigned int action)
  45 {
  46 #ifdef CONFIG_MIPS_MT_SMTC
  47         void smtc_send_ipi(int, int, unsigned int);
  48
  49         smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
  50 #endif /* CONFIG_MIPS_MT_SMTC */
  51 /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
  52
  53 }
  54
  55 /*
  56  * Detect available CPUs/VPEs/TCs and populate phys_cpu_present_map
  57  */
  58
  59 void __init prom_build_cpu_map(void)
  60 {
  61 #ifdef CONFIG_MIPS_MT_SMTC
  62         extern int mipsmt_build_cpu_map(int startslot);
  63         int nextslot;
  64
  65         cpus_clear(phys_cpu_present_map);
  66
  67         /* Register the boot CPU */
  68
  69         smp_prepare_boot_cpu();
  70
  71         /*
  72          * As of November, 2004, MIPSsim only simulates one core
  73          * at a time.  However, that core may be a MIPS MT core
  74          * with multiple virtual processors and thread contexts.
  75          */
  76
  77         if (read_c0_config3() & (1<<2)) {
  78                 nextslot = mipsmt_build_cpu_map(1);
  79         }
  80 #endif /* CONFIG_MIPS_MT_SMTC */
  81 }
  82
  83 /*
  84  * Platform "CPU" startup hook
  85  */
  86
  87 void prom_boot_secondary(int cpu, struct task_struct *idle)
  88 {
  89 #ifdef CONFIG_MIPS_MT_SMTC
  90         extern void smtc_boot_secondary(int cpu, struct task_struct *t);
  91
  92         smtc_boot_secondary(cpu, idle);
  93 #endif /* CONFIG_MIPS_MT_SMTC */
  94 }
  95
  96 /*
  97  * Post-config but pre-boot cleanup entry point
  98  */
  99
 100 void prom_init_secondary(void)
 101 {
 102 #ifdef CONFIG_MIPS_MT_SMTC
 103         void smtc_init_secondary(void);
 104
 105         smtc_init_secondary();
 106 #endif /* CONFIG_MIPS_MT_SMTC */
 107 }
 108
 109 /*
 110  * Platform SMP pre-initialization
 111  */
 112
 113 void prom_prepare_cpus(unsigned int max_cpus)
 114 {
 115 #ifdef CONFIG_MIPS_MT_SMTC
 116         void mipsmt_prepare_cpus(int c);
 117         /*
 118          * As noted above, we can assume a single CPU for now
 119          * but it may be multithreaded.
 120          */
 121
 122         if (read_c0_config3() & (1<<2)) {
 123                 mipsmt_prepare_cpus(max_cpus);
 124         }
 125 #endif /* CONFIG_MIPS_MT_SMTC */
 126 }
 127
 128 /*
 129  * SMP initialization finalization entry point
 130  */
 131
 132 void prom_smp_finish(void)
 133 {
 134 #ifdef CONFIG_MIPS_MT_SMTC
 135         void smtc_smp_finish(void);
 136
 137         smtc_smp_finish();
 138 #endif /* CONFIG_MIPS_MT_SMTC */
 139 }
 140
 141 /*
 142  * Hook for after all CPUs are online
 143  */
 144
 145 void prom_cpus_done(void)
 146 {
 147 #ifdef CONFIG_MIPS_MT_SMTC
 148
 149 #endif /* CONFIG_MIPS_MT_SMTC */
 150 }
 151 #endif /* CONFIG_MIPS32R2_MT_SMP */