1#include <linux/cpumask.h>
2#include <linux/interrupt.h>
3
4#include <linux/mm.h>
5#include <linux/delay.h>
6#include <linux/spinlock.h>
7#include <linux/kernel_stat.h>
8#include <linux/mc146818rtc.h>
9#include <linux/cache.h>
10#include <linux/cpu.h>
11#include <linux/module.h>
12
13#include <asm/smp.h>
14#include <asm/mtrr.h>
15#include <asm/tlbflush.h>
16#include <asm/mmu_context.h>
17#include <asm/apic.h>
18#include <asm/proto.h>
19#include <asm/ipi.h>
20
21void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
22{
23	unsigned long query_cpu;
24	unsigned long flags;
25
26	/*
27	 * Hack. The clustered APIC addressing mode doesn't allow us to send
28	 * to an arbitrary mask, so I do a unicast to each CPU instead.
29	 * - mbligh
30	 */
31	local_irq_save(flags);
32	for_each_cpu(query_cpu, mask) {
33		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
34				query_cpu), vector, APIC_DEST_PHYSICAL);
35	}
36	local_irq_restore(flags);
37}
38
39void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
40						 int vector)
41{
42	unsigned int this_cpu = smp_processor_id();
43	unsigned int query_cpu;
44	unsigned long flags;
45
46	/* See Hack comment above */
47
48	local_irq_save(flags);
49	for_each_cpu(query_cpu, mask) {
50		if (query_cpu == this_cpu)
51			continue;
52		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
53				 query_cpu), vector, APIC_DEST_PHYSICAL);
54	}
55	local_irq_restore(flags);
56}
57
58#ifdef CONFIG_X86_32
59
60void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
61						 int vector)
62{
63	unsigned long flags;
64	unsigned int query_cpu;
65
66	/*
67	 * Hack. The clustered APIC addressing mode doesn't allow us to send
68	 * to an arbitrary mask, so I do a unicasts to each CPU instead. This
69	 * should be modified to do 1 message per cluster ID - mbligh
70	 */
71
72	local_irq_save(flags);
73	for_each_cpu(query_cpu, mask)
74		__default_send_IPI_dest_field(
75			early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
76			vector, apic->dest_logical);
77	local_irq_restore(flags);
78}
79
80void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
81						 int vector)
82{
83	unsigned long flags;
84	unsigned int query_cpu;
85	unsigned int this_cpu = smp_processor_id();
86
87	/* See Hack comment above */
88
89	local_irq_save(flags);
90	for_each_cpu(query_cpu, mask) {
91		if (query_cpu == this_cpu)
92			continue;
93		__default_send_IPI_dest_field(
94			early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
95			vector, apic->dest_logical);
96		}
97	local_irq_restore(flags);
98}
99
100/*
101 * This is only used on smaller machines.
102 */
103void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
104{
105	unsigned long mask = cpumask_bits(cpumask)[0];
106	unsigned long flags;
107
108	if (!mask)
109		return;
110
111	local_irq_save(flags);
112	WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
113	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
114	local_irq_restore(flags);
115}
116
117void default_send_IPI_allbutself(int vector)
118{
119	/*
120	 * if there are no other CPUs in the system then we get an APIC send
121	 * error if we try to broadcast, thus avoid sending IPIs in this case.
122	 */
123	if (!(num_online_cpus() > 1))
124		return;
125
126	__default_local_send_IPI_allbutself(vector);
127}
128
129void default_send_IPI_all(int vector)
130{
131	__default_local_send_IPI_all(vector);
132}
133
134void default_send_IPI_self(int vector)
135{
136	__default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
137}
138
139/* must come after the send_IPI functions above for inlining */
140static int convert_apicid_to_cpu(int apic_id)
141{
142	int i;
143
144	for_each_possible_cpu(i) {
145		if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
146			return i;
147	}
148	return -1;
149}
150
151int safe_smp_processor_id(void)
152{
153	int apicid, cpuid;
154
155	if (!cpu_has_apic)
156		return 0;
157
158	apicid = hard_smp_processor_id();
159	if (apicid == BAD_APICID)
160		return 0;
161
162	cpuid = convert_apicid_to_cpu(apicid);
163
164	return cpuid >= 0 ? cpuid : 0;
165}
166#endif
167