1/*
2 * SMP Support
3 *
4 * Copyright (C) 1999 VA Linux Systems
5 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
6 * Copyright (C) 2001 Hewlett-Packard Co
7 *	David Mosberger-Tang <davidm@hpl.hp.com>
8 */
9#ifndef _ASM_IA64_SMP_H
10#define _ASM_IA64_SMP_H
11
12#include <linux/config.h>
13
14#ifdef CONFIG_SMP
15
16#include <linux/init.h>
17#include <linux/threads.h>
18#include <linux/kernel.h>
19
20#include <asm/io.h>
21#include <asm/param.h>
22#include <asm/processor.h>
23#include <asm/ptrace.h>
24
25#define XTP_OFFSET		0x1e0008
26
27#define SMP_IRQ_REDIRECTION	(1 << 0)
28#define SMP_IPI_REDIRECTION	(1 << 1)
29
30#define smp_processor_id()	(current->processor)
31
32extern struct smp_boot_data {
33	int cpu_count;
34	int cpu_phys_id[NR_CPUS];
35} smp_boot_data __initdata;
36
37extern char no_int_routing __initdata;
38
39extern volatile unsigned long cpu_online_map;
40extern unsigned long ipi_base_addr;
41extern unsigned char smp_int_redirect;
42extern int smp_num_cpus;
43
44extern volatile int ia64_cpu_to_sapicid[];
45#define cpu_physical_id(i)	ia64_cpu_to_sapicid[i]
46#define cpu_number_map(i)	(i)
47#define cpu_logical_map(i)	(i)
48
49extern unsigned long ap_wakeup_vector;
50
51/*
52 * Function to map hard smp processor id to logical id.  Slow, so
53 * don't use this in performance-critical code.
54 */
55static inline int
56cpu_logical_id (int cpuid)
57{
58	int i;
59
60	for (i = 0; i < smp_num_cpus; ++i)
61		if (cpu_physical_id(i) == (__u32) cpuid)
62			break;
63	return i;
64}
65
66/*
67 * XTP control functions:
68 *	min_xtp   : route all interrupts to this CPU
69 *	normal_xtp: nominal XTP value
70 *	max_xtp   : never deliver interrupts to this CPU.
71 */
72
73static inline void
74min_xtp (void)
75{
76	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
77		writeb(0x00, ipi_base_addr | XTP_OFFSET); /* XTP to min */
78}
79
80static inline void
81normal_xtp (void)
82{
83	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
84		writeb(0x08, ipi_base_addr | XTP_OFFSET); /* XTP normal */
85}
86
87static inline void
88max_xtp (void)
89{
90	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
91		writeb(0x0f, ipi_base_addr | XTP_OFFSET); /* Set XTP to max */
92}
93
94static inline unsigned int
95hard_smp_processor_id (void)
96{
97	union {
98		struct {
99			unsigned long reserved : 16;
100			unsigned long eid : 8;
101			unsigned long id : 8;
102			unsigned long ignored : 32;
103		} f;
104		unsigned long bits;
105	} lid;
106
107	lid.bits = ia64_get_lid();
108	return lid.f.id << 8 | lid.f.eid;
109}
110
111#define NO_PROC_ID		0xffffffff	/* no processor magic marker */
112
113/*
114 * Extra overhead to move a task from one cpu to another (due to TLB and cache misses).
115 * Expressed in "negative nice value" units (larger number means higher priority/penalty).
116 */
117#define PROC_CHANGE_PENALTY	20
118
119extern void __init init_smp_config (void);
120extern void smp_do_timer (struct pt_regs *regs);
121
122extern int smp_call_function_single (int cpuid, void (*func) (void *info), void *info,
123				     int retry, int wait);
124
125
126#endif /* CONFIG_SMP */
127#endif /* _ASM_IA64_SMP_H */
128