- /*
- * SMP Support
- *
- * Copyright (C) 1999 VA Linux Systems
- * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
- * Copyright (C) 2001 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- */
- #ifndef _ASM_IA64_SMP_H
- #define _ASM_IA64_SMP_H
- #include <linux/config.h>
- #ifdef CONFIG_SMP
- #include <linux/init.h>
- #include <linux/threads.h>
- #include <linux/kernel.h>
- #include <asm/io.h>
- #include <asm/param.h>
- #include <asm/processor.h>
- #include <asm/ptrace.h>
- #define XTP_OFFSET 0x1e0008
- #define SMP_IRQ_REDIRECTION (1 << 0)
- #define SMP_IPI_REDIRECTION (1 << 1)
- #define smp_processor_id() (current->processor)
- extern struct smp_boot_data {
- int cpu_count;
- int cpu_phys_id[NR_CPUS];
- } smp_boot_data __initdata;
- extern char no_int_routing __initdata;
- extern volatile unsigned long cpu_online_map;
- extern unsigned long ipi_base_addr;
- extern unsigned char smp_int_redirect;
- extern int smp_num_cpus;
- extern volatile int ia64_cpu_to_sapicid[];
- #define cpu_physical_id(i) ia64_cpu_to_sapicid[i]
- #define cpu_number_map(i) (i)
- #define cpu_logical_map(i) (i)
- extern unsigned long ap_wakeup_vector;
- /*
- * Function to map hard smp processor id to logical id. Slow, so
- * don't use this in performance-critical code.
- */
- static inline int
- cpu_logical_id (int cpuid)
- {
- int i;
- for (i = 0; i < smp_num_cpus; ++i)
- if (cpu_physical_id(i) == (__u32) cpuid)
- break;
- return i;
- }
- /*
- * XTP control functions:
- * min_xtp : route all interrupts to this CPU
- * normal_xtp: nominal XTP value
- * max_xtp : never deliver interrupts to this CPU.
- */
- static inline void
- min_xtp (void)
- {
- if (smp_int_redirect & SMP_IRQ_REDIRECTION)
- writeb(0x00, ipi_base_addr | XTP_OFFSET); /* XTP to min */
- }
- static inline void
- normal_xtp (void)
- {
- if (smp_int_redirect & SMP_IRQ_REDIRECTION)
- writeb(0x08, ipi_base_addr | XTP_OFFSET); /* XTP normal */
- }
- static inline void
- max_xtp (void)
- {
- if (smp_int_redirect & SMP_IRQ_REDIRECTION)
- writeb(0x0f, ipi_base_addr | XTP_OFFSET); /* Set XTP to max */
- }
- static inline unsigned int
- hard_smp_processor_id (void)
- {
- union {
- struct {
- unsigned long reserved : 16;
- unsigned long eid : 8;
- unsigned long id : 8;
- unsigned long ignored : 32;
- } f;
- unsigned long bits;
- } lid;
- lid.bits = ia64_get_lid();
- return lid.f.id << 8 | lid.f.eid;
- }
- #define NO_PROC_ID 0xffffffff /* no processor magic marker */
- /*
- * Extra overhead to move a task from one cpu to another (due to TLB and cache misses).
- * Expressed in "negative nice value" units (larger number means higher priority/penalty).
- */
- #define PROC_CHANGE_PENALTY 20
- extern void __init init_smp_config (void);
- extern void smp_do_timer (struct pt_regs *regs);
- extern int smp_call_function_single (int cpuid, void (*func) (void *info), void *info,
- int retry, int wait);
- #endif /* CONFIG_SMP */
- #endif /* _ASM_IA64_SMP_H */