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/*
* 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 */
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