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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NOOP APIC driver.
4 *
5 * Does almost nothing and should be substituted by a real apic driver via
6 * probe routine.
7 *
8 * Though in case if apic is disabled (for some reason) we try
9 * to not uglify the caller's code and allow to call (some) apic routines
10 * like self-ipi, etc...
11 */
12
13#include <linux/threads.h>
14#include <linux/cpumask.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17#include <linux/ctype.h>
18#include <linux/errno.h>
19#include <asm/fixmap.h>
20#include <asm/mpspec.h>
21#include <asm/apicdef.h>
22#include <asm/apic.h>
23#include <asm/setup.h>
24
25#include <linux/smp.h>
26#include <asm/ipi.h>
27
28#include <linux/interrupt.h>
29#include <asm/acpi.h>
30#include <asm/e820/api.h>
31
32static void noop_init_apic_ldr(void) { }
33static void noop_send_IPI(int cpu, int vector) { }
34static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
35static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
36static void noop_send_IPI_allbutself(int vector) { }
37static void noop_send_IPI_all(int vector) { }
38static void noop_send_IPI_self(int vector) { }
39static void noop_apic_wait_icr_idle(void) { }
40static void noop_apic_icr_write(u32 low, u32 id) { }
41
42static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
43{
44 return -1;
45}
46
47static u32 noop_safe_apic_wait_icr_idle(void)
48{
49 return 0;
50}
51
52static u64 noop_apic_icr_read(void)
53{
54 return 0;
55}
56
57static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
58{
59 return 0;
60}
61
62static unsigned int noop_get_apic_id(unsigned long x)
63{
64 return 0;
65}
66
67static int noop_probe(void)
68{
69 /*
70 * NOOP apic should not ever be
71 * enabled via probe routine
72 */
73 return 0;
74}
75
76static int noop_apic_id_registered(void)
77{
78 /*
79 * if we would be really "pedantic"
80 * we should pass read_apic_id() here
81 * but since NOOP suppose APIC ID = 0
82 * lets save a few cycles
83 */
84 return physid_isset(0, phys_cpu_present_map);
85}
86
87static u32 noop_apic_read(u32 reg)
88{
89 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
90 return 0;
91}
92
93static void noop_apic_write(u32 reg, u32 v)
94{
95 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
96}
97
98#ifdef CONFIG_X86_32
99static int noop_x86_32_early_logical_apicid(int cpu)
100{
101 return BAD_APICID;
102}
103#endif
104
105struct apic apic_noop __ro_after_init = {
106 .name = "noop",
107 .probe = noop_probe,
108 .acpi_madt_oem_check = NULL,
109
110 .apic_id_valid = default_apic_id_valid,
111 .apic_id_registered = noop_apic_id_registered,
112
113 .irq_delivery_mode = dest_Fixed,
114 /* logical delivery broadcast to all CPUs: */
115 .irq_dest_mode = 1,
116
117 .disable_esr = 0,
118 .dest_logical = APIC_DEST_LOGICAL,
119 .check_apicid_used = default_check_apicid_used,
120
121 .init_apic_ldr = noop_init_apic_ldr,
122
123 .ioapic_phys_id_map = default_ioapic_phys_id_map,
124 .setup_apic_routing = NULL,
125
126 .cpu_present_to_apicid = default_cpu_present_to_apicid,
127 .apicid_to_cpu_present = physid_set_mask_of_physid,
128
129 .check_phys_apicid_present = default_check_phys_apicid_present,
130
131 .phys_pkg_id = noop_phys_pkg_id,
132
133 .get_apic_id = noop_get_apic_id,
134 .set_apic_id = NULL,
135
136 .calc_dest_apicid = apic_flat_calc_apicid,
137
138 .send_IPI = noop_send_IPI,
139 .send_IPI_mask = noop_send_IPI_mask,
140 .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
141 .send_IPI_allbutself = noop_send_IPI_allbutself,
142 .send_IPI_all = noop_send_IPI_all,
143 .send_IPI_self = noop_send_IPI_self,
144
145 .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
146
147 .inquire_remote_apic = NULL,
148
149 .read = noop_apic_read,
150 .write = noop_apic_write,
151 .eoi_write = noop_apic_write,
152 .icr_read = noop_apic_icr_read,
153 .icr_write = noop_apic_icr_write,
154 .wait_icr_idle = noop_apic_wait_icr_idle,
155 .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
156
157#ifdef CONFIG_X86_32
158 .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,
159#endif
160};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NOOP APIC driver.
4 *
5 * Does almost nothing and should be substituted by a real apic driver via
6 * probe routine.
7 *
8 * Though in case if apic is disabled (for some reason) we try
9 * to not uglify the caller's code and allow to call (some) apic routines
10 * like self-ipi, etc...
11 */
12#include <linux/cpumask.h>
13#include <linux/thread_info.h>
14
15#include <asm/apic.h>
16
17static void noop_init_apic_ldr(void) { }
18static void noop_send_IPI(int cpu, int vector) { }
19static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
20static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
21static void noop_send_IPI_allbutself(int vector) { }
22static void noop_send_IPI_all(int vector) { }
23static void noop_send_IPI_self(int vector) { }
24static void noop_apic_wait_icr_idle(void) { }
25static void noop_apic_icr_write(u32 low, u32 id) { }
26
27static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
28{
29 return -1;
30}
31
32static u32 noop_safe_apic_wait_icr_idle(void)
33{
34 return 0;
35}
36
37static u64 noop_apic_icr_read(void)
38{
39 return 0;
40}
41
42static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
43{
44 return 0;
45}
46
47static unsigned int noop_get_apic_id(unsigned long x)
48{
49 return 0;
50}
51
52static int noop_probe(void)
53{
54 /*
55 * NOOP apic should not ever be
56 * enabled via probe routine
57 */
58 return 0;
59}
60
61static int noop_apic_id_registered(void)
62{
63 /*
64 * if we would be really "pedantic"
65 * we should pass read_apic_id() here
66 * but since NOOP suppose APIC ID = 0
67 * lets save a few cycles
68 */
69 return physid_isset(0, phys_cpu_present_map);
70}
71
72static u32 noop_apic_read(u32 reg)
73{
74 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
75 return 0;
76}
77
78static void noop_apic_write(u32 reg, u32 v)
79{
80 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
81}
82
83#ifdef CONFIG_X86_32
84static int noop_x86_32_early_logical_apicid(int cpu)
85{
86 return BAD_APICID;
87}
88#endif
89
90struct apic apic_noop __ro_after_init = {
91 .name = "noop",
92 .probe = noop_probe,
93 .acpi_madt_oem_check = NULL,
94
95 .apic_id_valid = default_apic_id_valid,
96 .apic_id_registered = noop_apic_id_registered,
97
98 .irq_delivery_mode = dest_Fixed,
99 /* logical delivery broadcast to all CPUs: */
100 .irq_dest_mode = 1,
101
102 .disable_esr = 0,
103 .dest_logical = APIC_DEST_LOGICAL,
104 .check_apicid_used = default_check_apicid_used,
105
106 .init_apic_ldr = noop_init_apic_ldr,
107
108 .ioapic_phys_id_map = default_ioapic_phys_id_map,
109 .setup_apic_routing = NULL,
110
111 .cpu_present_to_apicid = default_cpu_present_to_apicid,
112 .apicid_to_cpu_present = physid_set_mask_of_physid,
113
114 .check_phys_apicid_present = default_check_phys_apicid_present,
115
116 .phys_pkg_id = noop_phys_pkg_id,
117
118 .get_apic_id = noop_get_apic_id,
119 .set_apic_id = NULL,
120
121 .calc_dest_apicid = apic_flat_calc_apicid,
122
123 .send_IPI = noop_send_IPI,
124 .send_IPI_mask = noop_send_IPI_mask,
125 .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
126 .send_IPI_allbutself = noop_send_IPI_allbutself,
127 .send_IPI_all = noop_send_IPI_all,
128 .send_IPI_self = noop_send_IPI_self,
129
130 .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
131
132 .inquire_remote_apic = NULL,
133
134 .read = noop_apic_read,
135 .write = noop_apic_write,
136 .eoi_write = noop_apic_write,
137 .icr_read = noop_apic_icr_read,
138 .icr_write = noop_apic_icr_write,
139 .wait_icr_idle = noop_apic_wait_icr_idle,
140 .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
141
142#ifdef CONFIG_X86_32
143 .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,
144#endif
145};