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/init.h>
  14 #include <linux/threads.h>
  15 #include <linux/kernel.h>
  16 #include <linux/cpumask.h>
  17
  18 #include <asm/bitops.h>
  19 #include <asm/io.h>
  20 #include <asm/param.h>
  21 #include <asm/processor.h>
  22 #include <asm/ptrace.h>
  23
  24 static inline unsigned int
  25 ia64_get_lid (void)
  26 {
  27         union {
  28                 struct {
  29                         unsigned long reserved : 16;
  30                         unsigned long eid : 8;
  31                         unsigned long id : 8;
  32                         unsigned long ignored : 32;
  33                 } f;
  34                 unsigned long bits;
  35         } lid;
  36
  37         lid.bits = ia64_getreg(_IA64_REG_CR_LID);
  38         return lid.f.id << 8 | lid.f.eid;
  39 }
  40
  41 #ifdef CONFIG_SMP
  42
  43 #define XTP_OFFSET              0x1e0008
  44
  45 #define SMP_IRQ_REDIRECTION     (1 << 0)
  46 #define SMP_IPI_REDIRECTION     (1 << 1)
  47
  48 #define raw_smp_processor_id() (current_thread_info()->cpu)
  49
  50 extern struct smp_boot_data {
  51         int cpu_count;
  52         int cpu_phys_id[NR_CPUS];
  53 } smp_boot_data __initdata;
  54
  55 extern char no_int_routing __devinitdata;
  56
  57 extern cpumask_t cpu_online_map;
  58 extern cpumask_t cpu_core_map[NR_CPUS];
  59 extern cpumask_t cpu_sibling_map[NR_CPUS];
  60 extern int smp_num_siblings;
  61 extern int smp_num_cpucores;
  62 extern void __iomem *ipi_base_addr;
  63 extern unsigned char smp_int_redirect;
  64
  65 extern volatile int ia64_cpu_to_sapicid[];
  66 #define cpu_physical_id(i)      ia64_cpu_to_sapicid[i]
  67
  68 extern unsigned long ap_wakeup_vector;
  69
  70 /*
  71  * Function to map hard smp processor id to logical id.  Slow, so don't use this in
  72  * performance-critical code.
  73  */
  74 static inline int
  75 cpu_logical_id (int cpuid)
  76 {
  77         int i;
  78
  79         for (i = 0; i < NR_CPUS; ++i)
  80                 if (cpu_physical_id(i) == cpuid)
  81                         break;
  82         return i;
  83 }
  84
  85 /*
  86  * XTP control functions:
  87  *      min_xtp   : route all interrupts to this CPU
  88  *      normal_xtp: nominal XTP value
  89  *      max_xtp   : never deliver interrupts to this CPU.
  90  */
  91
  92 static inline void
  93 min_xtp (void)
  94 {
  95         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
  96                 writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
  97 }
  98
  99 static inline void
 100 normal_xtp (void)
 101 {
 102         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 103                 writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
 104 }
 105
 106 static inline void
 107 max_xtp (void)
 108 {
 109         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 110                 writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
 111 }
 112
 113 #define hard_smp_processor_id()         ia64_get_lid()
 114
 115 /* Upping and downing of CPUs */
 116 extern int __cpu_disable (void);
 117 extern void __cpu_die (unsigned int cpu);
 118 extern void cpu_die (void) __attribute__ ((noreturn));
 119 extern int __cpu_up (unsigned int cpu);
 120 extern void __init smp_build_cpu_map(void);
 121
 122 extern void __init init_smp_config (void);
 123 extern void smp_do_timer (struct pt_regs *regs);
 124
 125 extern void smp_send_reschedule (int cpu);
 126 extern void lock_ipi_calllock(void);
 127 extern void unlock_ipi_calllock(void);
 128 extern void identify_siblings (struct cpuinfo_ia64 *);
 129 extern int is_multithreading_enabled(void);
 130
 131 #else
 132
 133 #define cpu_logical_id(i)               0
 134 #define cpu_physical_id(i)              ia64_get_lid()
 135
 136 #endif /* CONFIG_SMP */
 137 #endif /* _ASM_IA64_SMP_H */