include/asm-ia64/smp.h

   1 /*
   2  * SMP Support
   3  *
   4  * Copyright (C) 1999 VA Linux Systems
   5  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   6  * (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   9  */
  10 #ifndef _ASM_IA64_SMP_H
  11 #define _ASM_IA64_SMP_H
  12
  13 #include <linux/config.h>
  14 #include <linux/init.h>
  15 #include <linux/threads.h>
  16 #include <linux/kernel.h>
  17 #include <linux/cpumask.h>
  18
  19 #include <asm/bitops.h>
  20 #include <asm/io.h>
  21 #include <asm/param.h>
  22 #include <asm/processor.h>
  23 #include <asm/ptrace.h>
  24
  25 static inline unsigned int
  26 ia64_get_lid (void)
  27 {
  28         union {
  29                 struct {
  30                         unsigned long reserved : 16;
  31                         unsigned long eid : 8;
  32                         unsigned long id : 8;
  33                         unsigned long ignored : 32;
  34                 } f;
  35                 unsigned long bits;
  36         } lid;
  37
  38         lid.bits = ia64_getreg(_IA64_REG_CR_LID);
  39         return lid.f.id << 8 | lid.f.eid;
  40 }
  41
  42 #ifdef CONFIG_SMP
  43
  44 #define XTP_OFFSET              0x1e0008
  45
  46 #define SMP_IRQ_REDIRECTION     (1 << 0)
  47 #define SMP_IPI_REDIRECTION     (1 << 1)
  48
  49 #define smp_processor_id()      (current_thread_info()->cpu)
  50
  51 extern struct smp_boot_data {
  52         int cpu_count;
  53         int cpu_phys_id[NR_CPUS];
  54 } smp_boot_data __initdata;
  55
  56 extern char no_int_routing __devinitdata;
  57
  58 extern cpumask_t cpu_online_map;
  59 extern void __iomem *ipi_base_addr;
  60 extern unsigned char smp_int_redirect;
  61
  62 extern volatile int ia64_cpu_to_sapicid[];
  63 #define cpu_physical_id(i)      ia64_cpu_to_sapicid[i]
  64
  65 extern unsigned long ap_wakeup_vector;
  66
  67 /*
  68  * Function to map hard smp processor id to logical id.  Slow, so don't use this in
  69  * performance-critical code.
  70  */
  71 static inline int
  72 cpu_logical_id (int cpuid)
  73 {
  74         int i;
  75
  76         for (i = 0; i < NR_CPUS; ++i)
  77                 if (cpu_physical_id(i) == cpuid)
  78                         break;
  79         return i;
  80 }
  81
  82 /*
  83  * XTP control functions:
  84  *      min_xtp   : route all interrupts to this CPU
  85  *      normal_xtp: nominal XTP value
  86  *      max_xtp   : never deliver interrupts to this CPU.
  87  */
  88
  89 static inline void
  90 min_xtp (void)
  91 {
  92         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
  93                 writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
  94 }
  95
  96 static inline void
  97 normal_xtp (void)
  98 {
  99         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 100                 writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
 101 }
 102
 103 static inline void
 104 max_xtp (void)
 105 {
 106         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 107                 writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
 108 }
 109
 110 #define hard_smp_processor_id()         ia64_get_lid()
 111
 112 /* Upping and downing of CPUs */
 113 extern int __cpu_disable (void);
 114 extern void __cpu_die (unsigned int cpu);
 115 extern void cpu_die (void) __attribute__ ((noreturn));
 116 extern int __cpu_up (unsigned int cpu);
 117 extern void __init smp_build_cpu_map(void);
 118
 119 extern void __init init_smp_config (void);
 120 extern void smp_do_timer (struct pt_regs *regs);
 121
 122 extern int smp_call_function_single (int cpuid, void (*func) (void *info), void *info,
 123                                      int retry, int wait);
 124 extern void smp_send_reschedule (int cpu);
 125 extern void lock_ipi_calllock(void);
 126 extern void unlock_ipi_calllock(void);
 127
 128 #else
 129
 130 #define cpu_logical_id(i)               0
 131 #define cpu_physical_id(i)              ia64_get_lid()
 132
 133 #endif /* CONFIG_SMP */
 134 #endif /* _ASM_IA64_SMP_H */