smp.h revision 7f30491ccd28627742e37899453ae20e3da8e18f 
1/*
2 * SMP Support
3 *
4 * Copyright (C) 1999 VA Linux Systems
5 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
6 * (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
7 *	David Mosberger-Tang <davidm@hpl.hp.com>
8 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
9 */
10#ifndef _ASM_IA64_SMP_H
11#define _ASM_IA64_SMP_H
12
13#include <linux/init.h>
14#include <linux/threads.h>
15#include <linux/kernel.h>
16#include <linux/cpumask.h>
17#include <linux/bitops.h>
18#include <linux/irqreturn.h>
19
20#include <asm/io.h>
21#include <asm/param.h>
22#include <asm/processor.h>
23#include <asm/ptrace.h>
24
25static inline unsigned int
26ia64_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 XTP_OFFSET		0x1e0008
47
48#define SMP_IRQ_REDIRECTION	(1 << 0)
49#define SMP_IPI_REDIRECTION	(1 << 1)
50
51#define raw_smp_processor_id() (current_thread_info()->cpu)
52
53extern struct smp_boot_data {
54	int cpu_count;
55	int cpu_phys_id[NR_CPUS];
56} smp_boot_data __initdata;
57
58extern char no_int_routing __devinitdata;
59
60extern cpumask_t cpu_online_map;
61extern cpumask_t cpu_core_map[NR_CPUS];
62DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
63extern int smp_num_siblings;
64extern void __iomem *ipi_base_addr;
65extern unsigned char smp_int_redirect;
66
67extern volatile int ia64_cpu_to_sapicid[];
68#define cpu_physical_id(i)	ia64_cpu_to_sapicid[i]
69
70extern unsigned long ap_wakeup_vector;
71
72/*
73 * Function to map hard smp processor id to logical id.  Slow, so don't use this in
74 * performance-critical code.
75 */
76static inline int
77cpu_logical_id (int cpuid)
78{
79	int i;
80
81	for (i = 0; i < NR_CPUS; ++i)
82		if (cpu_physical_id(i) == cpuid)
83			break;
84	return i;
85}
86
87/*
88 * XTP control functions:
89 *	min_xtp   : route all interrupts to this CPU
90 *	normal_xtp: nominal XTP value
91 *	max_xtp   : never deliver interrupts to this CPU.
92 */
93
94static inline void
95min_xtp (void)
96{
97	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
98		writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
99}
100
101static inline void
102normal_xtp (void)
103{
104	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
105		writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
106}
107
108static inline void
109max_xtp (void)
110{
111	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
112		writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
113}
114
115/* Upping and downing of CPUs */
116extern int __cpu_disable (void);
117extern void __cpu_die (unsigned int cpu);
118extern void cpu_die (void) __attribute__ ((noreturn));
119extern void __init smp_build_cpu_map(void);
120
121extern void __init init_smp_config (void);
122extern void smp_do_timer (struct pt_regs *regs);
123
124extern irqreturn_t handle_IPI(int irq, void *dev_id);
125extern void smp_send_reschedule (int cpu);
126extern void identify_siblings (struct cpuinfo_ia64 *);
127extern int is_multithreading_enabled(void);
128
129extern void arch_send_call_function_single_ipi(int cpu);
130extern void arch_send_call_function_ipi(cpumask_t mask);
131
132#else /* CONFIG_SMP */
133
134#define cpu_logical_id(i)		0
135#define cpu_physical_id(i)		ia64_get_lid()
136
137#endif /* CONFIG_SMP */
138#endif /* _ASM_IA64_SMP_H */
139