139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* SMP Support
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*
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#ifndef _ASM_IA64_SMP_H
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#define _ASM_IA64_SMP_H
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/kernel.h>
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#include <linux/cpumask.h>
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#include <linux/bitops.h>
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#include <linux/irqreturn.h>
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#include <asm/io.h>
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#include <asm/param.h>
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#include <asm/processor.h>
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#include <asm/ptrace.h>
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static inline unsigned int
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ia64_get_lid (void)
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{
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union {
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struct {
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unsigned long reserved : 16;
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unsigned long eid : 8;
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unsigned long id : 8;
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unsigned long ignored : 32;
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} f;
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unsigned long bits;
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} lid;
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lid.bits = ia64_getreg(_IA64_REG_CR_LID);
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return lid.f.id << 8 | lid.f.eid;
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}
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#define hard_smp_processor_id() ia64_get_lid()
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#ifdef CONFIG_SMP
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#define XTP_OFFSET 0x1e0008
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#define SMP_IRQ_REDIRECTION (1 << 0)
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#define SMP_IPI_REDIRECTION (1 << 1)
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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extern struct smp_boot_data {
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int cpu_count;
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int cpu_phys_id[NR_CPUS];
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} smp_boot_data __initdata;
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extern char no_int_routing;
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extern cpumask_t cpu_core_map[NR_CPUS];
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DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
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extern int smp_num_siblings;
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extern void __iomem *ipi_base_addr;
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extern unsigned char smp_int_redirect;
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extern volatile int ia64_cpu_to_sapicid[];
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#define cpu_physical_id(i) ia64_cpu_to_sapicid[i]
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extern unsigned long ap_wakeup_vector;
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/*
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* Function to map hard smp processor id to logical id. Slow, so don't use this in
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* performance-critical code.
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*/
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static inline int
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cpu_logical_id (int cpuid)
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{
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int i;
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for (i = 0; i < NR_CPUS; ++i)
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if (cpu_physical_id(i) == cpuid)
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break;
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return i;
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}
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/*
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* XTP control functions:
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* min_xtp : route all interrupts to this CPU
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* normal_xtp: nominal XTP value
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* max_xtp : never deliver interrupts to this CPU.
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*/
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static inline void
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min_xtp (void)
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{
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if (smp_int_redirect & SMP_IRQ_REDIRECTION)
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writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
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}
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static inline void
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normal_xtp (void)
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{
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if (smp_int_redirect & SMP_IRQ_REDIRECTION)
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writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
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}
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static inline void
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max_xtp (void)
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{
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if (smp_int_redirect & SMP_IRQ_REDIRECTION)
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writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
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}
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/* Upping and downing of CPUs */
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extern int __cpu_disable (void);
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extern void __cpu_die (unsigned int cpu);
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extern void cpu_die (void) __attribute__ ((noreturn));
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extern void __init smp_build_cpu_map(void);
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extern void __init init_smp_config (void);
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extern void smp_do_timer (struct pt_regs *regs);
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extern irqreturn_t handle_IPI(int irq, void *dev_id);
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extern void smp_send_reschedule (int cpu);
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extern void identify_siblings (struct cpuinfo_ia64 *);
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extern int is_multithreading_enabled(void);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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#else /* CONFIG_SMP */
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#define cpu_logical_id(i) 0
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#define cpu_physical_id(i) ia64_get_lid()
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#endif /* CONFIG_SMP */
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#endif /* _ASM_IA64_SMP_H */
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