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 ia64_get_lid(void)26ia64_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_SHARED_ALIGNED(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 cpu_logical_id(int cpuid)76cpu_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 min_xtp(void)94min_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 normal_xtp(void)101normal_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 max_xtp(void)108max_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_mask(const struct cpumask *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 */ 138