arch/ia64/include/asm/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 #include <linux/bitops.h>
  18 #include <linux/irqreturn.h>
  19
  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 #define hard_smp_processor_id()         ia64_get_lid()
  43
  44 #ifdef CONFIG_SMP
  45
  46 #define XTP_OFFSET              0x1e0008
  47
  48 #define SMP_IRQ_REDIRECTION     (1 << 0)
  49 #define SMP_IPI_REDIRECTION     (1 << 1)
  50
  51 #define raw_smp_processor_id() (current_thread_info()->cpu)
  52
  53 extern struct smp_boot_data {
  54         int cpu_count;
  55         int cpu_phys_id[NR_CPUS];
  56 } smp_boot_data __initdata;
  57
  58 extern char no_int_routing __devinitdata;
  59
  60 extern cpumask_t cpu_core_map[NR_CPUS];
  61 DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
  62 extern int smp_num_siblings;
  63 extern void __iomem *ipi_base_addr;
  64 extern unsigned char smp_int_redirect;
  65
  66 extern volatile int ia64_cpu_to_sapicid[];
  67 #define cpu_physical_id(i)      ia64_cpu_to_sapicid[i]
  68
  69 extern unsigned long ap_wakeup_vector;
  70
  71 /*
  72  * Function to map hard smp processor id to logical id.  Slow, so don't use this in
  73  * performance-critical code.
  74  */
  75 static inline int
  76 cpu_logical_id (int cpuid)
  77 {
  78         int i;
  79
  80         for (i = 0; i < NR_CPUS; ++i)
  81                 if (cpu_physical_id(i) == cpuid)
  82                         break;
  83         return i;
  84 }
  85
  86 /*
  87  * XTP control functions:
  88  *      min_xtp   : route all interrupts to this CPU
  89  *      normal_xtp: nominal XTP value
  90  *      max_xtp   : never deliver interrupts to this CPU.
  91  */
  92
  93 static inline void
  94 min_xtp (void)
  95 {
  96         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
  97                 writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
  98 }
  99
 100 static inline void
 101 normal_xtp (void)
 102 {
 103         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 104                 writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
 105 }
 106
 107 static inline void
 108 max_xtp (void)
 109 {
 110         if (smp_int_redirect & SMP_IRQ_REDIRECTION)
 111                 writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
 112 }
 113
 114 /* Upping and downing of CPUs */
 115 extern int __cpu_disable (void);
 116 extern void __cpu_die (unsigned int cpu);
 117 extern void cpu_die (void) __attribute__ ((noreturn));
 118 extern void __init smp_build_cpu_map(void);
 119
 120 extern void __init init_smp_config (void);
 121 extern void smp_do_timer (struct pt_regs *regs);
 122
 123 extern irqreturn_t handle_IPI(int irq, void *dev_id);
 124 extern void smp_send_reschedule (int cpu);
 125 extern void identify_siblings (struct cpuinfo_ia64 *);
 126 extern int is_multithreading_enabled(void);
 127
 128 extern void arch_send_call_function_single_ipi(int cpu);
 129 extern void arch_send_call_function_ipi(cpumask_t mask);
 130
 131 #else /* CONFIG_SMP */
 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 */