arch/mips/include/asm/smtc.h

   1 #ifndef _ASM_SMTC_MT_H
   2 #define _ASM_SMTC_MT_H
   3
   4 /*
   5  * Definitions for SMTC multitasking on MIPS MT cores
   6  */
   7
   8 #include <asm/mips_mt.h>
   9 #include <asm/smtc_ipi.h>
  10
  11 /*
  12  * System-wide SMTC status information
  13  */
  14
  15 extern unsigned int smtc_status;
  16
  17 #define SMTC_TLB_SHARED 0x00000001
  18 #define SMTC_MTC_ACTIVE 0x00000002
  19
  20 /*
  21  * TLB/ASID Management information
  22  */
  23
  24 #define MAX_SMTC_TLBS 2
  25 #define MAX_SMTC_ASIDS 256
  26 #if NR_CPUS <= 8
  27 typedef char asiduse;
  28 #else
  29 #if NR_CPUS <= 16
  30 typedef short asiduse;
  31 #else
  32 typedef long asiduse;
  33 #endif
  34 #endif
  35
  36 /*
  37  * VPE Management information
  38  */
  39
  40 #define MAX_SMTC_VPES   MAX_SMTC_TLBS   /* FIXME: May not always be true. */
  41
  42 extern asiduse smtc_live_asid[MAX_SMTC_TLBS][MAX_SMTC_ASIDS];
  43
  44 struct mm_struct;
  45 struct task_struct;
  46
  47 void smtc_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu);
  48 void self_ipi(struct smtc_ipi *);
  49 void smtc_flush_tlb_asid(unsigned long asid);
  50 extern int smtc_build_cpu_map(int startslot);
  51 extern void smtc_prepare_cpus(int cpus);
  52 extern void smtc_smp_finish(void);
  53 extern void smtc_boot_secondary(int cpu, struct task_struct *t);
  54 extern void smtc_cpus_done(void);
  55 extern void smtc_init_secondary(void);
  56
  57
  58 /*
  59  * Sharing the TLB between multiple VPEs means that the
  60  * "random" index selection function is not allowed to
  61  * select the current value of the Index register. To
  62  * avoid additional TLB pressure, the Index registers
  63  * are "parked" with an non-Valid value.
  64  */
  65
  66 #define PARKED_INDEX    ((unsigned int)0x80000000)
  67
  68 /*
  69  * Define low-level interrupt mask for IPIs, if necessary.
  70  * By default, use SW interrupt 1, which requires no external
  71  * hardware support, but which works only for single-core
  72  * MIPS MT systems.
  73  */
  74 #ifndef MIPS_CPU_IPI_IRQ
  75 #define MIPS_CPU_IPI_IRQ 1
  76 #endif
  77
  78 #endif /*  _ASM_SMTC_MT_H */