| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |