1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * SMP Support 4 * 5 * Copyright (C) 1999 VA Linux Systems 6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 7 * (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P. 8 * David Mosberger-Tang <davidm@hpl.hp.com> 9 * Bjorn Helgaas <bjorn.helgaas@hp.com> 10 */ 11 #ifndef _ASM_IA64_SMP_H 12 #define _ASM_IA64_SMP_H 13 14 #include <linux/init.h> 15 #include <linux/threads.h> 16 #include <linux/kernel.h> 17 #include <linux/cpumask.h> 18 #include <linux/bitops.h> 19 #include <linux/irqreturn.h> 20 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 raw_smp_processor_id() (current_thread_info()->cpu) 47 48 extern struct smp_boot_data { 49 int cpu_count; 50 int cpu_phys_id[NR_CPUS]; 51 } smp_boot_data __initdata; 52 53 extern char no_int_routing; 54 55 extern cpumask_t cpu_core_map[NR_CPUS]; 56 DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 57 extern int smp_num_siblings; 58 extern void __iomem *ipi_base_addr; 59 60 extern volatile int ia64_cpu_to_sapicid[]; 61 #define cpu_physical_id(i) ia64_cpu_to_sapicid[i] 62 63 extern unsigned long ap_wakeup_vector; 64 65 /* 66 * Function to map hard smp processor id to logical id. Slow, so don't use this in 67 * performance-critical code. 68 */ 69 static inline int 70 cpu_logical_id (int cpuid) 71 { 72 int i; 73 74 for (i = 0; i < NR_CPUS; ++i) 75 if (cpu_physical_id(i) == cpuid) 76 break; 77 return i; 78 } 79 80 /* Upping and downing of CPUs */ 81 extern int __cpu_disable (void); 82 extern void __cpu_die (unsigned int cpu); 83 extern void cpu_die (void) __attribute__ ((noreturn)); 84 extern void __init smp_build_cpu_map(void); 85 86 extern void __init init_smp_config (void); 87 extern void smp_do_timer (struct pt_regs *regs); 88 89 extern irqreturn_t handle_IPI(int irq, void *dev_id); 90 extern void smp_send_reschedule (int cpu); 91 extern void identify_siblings (struct cpuinfo_ia64 *); 92 extern int is_multithreading_enabled(void); 93 94 extern void arch_send_call_function_single_ipi(int cpu); 95 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 96 97 #else /* CONFIG_SMP */ 98 99 #define cpu_logical_id(i) 0 100 #define cpu_physical_id(i) ia64_get_lid() 101 102 #endif /* CONFIG_SMP */ 103 #endif /* _ASM_IA64_SMP_H */ 104