Commit | Line | Data |
---|---|---|
9844ab11 CG |
1 | /* |
2 | * NOOP APIC driver. | |
3 | * | |
4 | * Does almost nothing and should be substituted by a real apic driver via | |
5 | * probe routine. | |
6 | * | |
7 | * Though in case if apic is disabled (for some reason) we try | |
8 | * to not uglify the caller's code and allow to call (some) apic routines | |
f88f2b4f | 9 | * like self-ipi, etc... |
9844ab11 CG |
10 | */ |
11 | ||
12 | #include <linux/threads.h> | |
13 | #include <linux/cpumask.h> | |
9844ab11 CG |
14 | #include <linux/string.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/ctype.h> | |
9844ab11 CG |
17 | #include <linux/errno.h> |
18 | #include <asm/fixmap.h> | |
19 | #include <asm/mpspec.h> | |
20 | #include <asm/apicdef.h> | |
21 | #include <asm/apic.h> | |
22 | #include <asm/setup.h> | |
23 | ||
24 | #include <linux/smp.h> | |
25 | #include <asm/ipi.h> | |
26 | ||
27 | #include <linux/interrupt.h> | |
28 | #include <asm/acpi.h> | |
29 | #include <asm/e820.h> | |
30 | ||
f88f2b4f | 31 | static void noop_init_apic_ldr(void) { } |
4727da2e | 32 | static void noop_send_IPI(int cpu, int vector) { } |
f88f2b4f CG |
33 | static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { } |
34 | static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { } | |
35 | static void noop_send_IPI_allbutself(int vector) { } | |
36 | static void noop_send_IPI_all(int vector) { } | |
37 | static void noop_send_IPI_self(int vector) { } | |
38 | static void noop_apic_wait_icr_idle(void) { } | |
39 | static void noop_apic_icr_write(u32 low, u32 id) { } | |
40 | ||
41 | static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip) | |
9844ab11 | 42 | { |
f88f2b4f | 43 | return -1; |
9844ab11 CG |
44 | } |
45 | ||
f88f2b4f CG |
46 | static u32 noop_safe_apic_wait_icr_idle(void) |
47 | { | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static u64 noop_apic_icr_read(void) | |
52 | { | |
53 | return 0; | |
54 | } | |
55 | ||
f88f2b4f CG |
56 | static int noop_phys_pkg_id(int cpuid_apic, int index_msb) |
57 | { | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static unsigned int noop_get_apic_id(unsigned long x) | |
62 | { | |
63 | return 0; | |
64 | } | |
9844ab11 CG |
65 | |
66 | static int noop_probe(void) | |
67 | { | |
f88f2b4f CG |
68 | /* |
69 | * NOOP apic should not ever be | |
70 | * enabled via probe routine | |
71 | */ | |
9844ab11 CG |
72 | return 0; |
73 | } | |
74 | ||
75 | static int noop_apic_id_registered(void) | |
76 | { | |
f88f2b4f CG |
77 | /* |
78 | * if we would be really "pedantic" | |
79 | * we should pass read_apic_id() here | |
80 | * but since NOOP suppose APIC ID = 0 | |
81 | * lets save a few cycles | |
82 | */ | |
83 | return physid_isset(0, phys_cpu_present_map); | |
9844ab11 CG |
84 | } |
85 | ||
86 | static const struct cpumask *noop_target_cpus(void) | |
87 | { | |
9844ab11 CG |
88 | /* only BSP here */ |
89 | return cpumask_of(0); | |
90 | } | |
91 | ||
1ac322d0 SS |
92 | static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask, |
93 | const struct cpumask *mask) | |
9844ab11 | 94 | { |
9844ab11 CG |
95 | if (cpu != 0) |
96 | pr_warning("APIC: Vector allocated for non-BSP cpu\n"); | |
9d8e1066 | 97 | cpumask_copy(retmask, cpumask_of(cpu)); |
9844ab11 CG |
98 | } |
99 | ||
9844ab11 CG |
100 | static u32 noop_apic_read(u32 reg) |
101 | { | |
93984fbd | 102 | WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic); |
9844ab11 CG |
103 | return 0; |
104 | } | |
105 | ||
f88f2b4f CG |
106 | static void noop_apic_write(u32 reg, u32 v) |
107 | { | |
93984fbd | 108 | WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic); |
f88f2b4f CG |
109 | } |
110 | ||
9844ab11 CG |
111 | struct apic apic_noop = { |
112 | .name = "noop", | |
113 | .probe = noop_probe, | |
114 | .acpi_madt_oem_check = NULL, | |
115 | ||
fa63030e | 116 | .apic_id_valid = default_apic_id_valid, |
9844ab11 CG |
117 | .apic_id_registered = noop_apic_id_registered, |
118 | ||
119 | .irq_delivery_mode = dest_LowestPrio, | |
120 | /* logical delivery broadcast to all CPUs: */ | |
121 | .irq_dest_mode = 1, | |
122 | ||
123 | .target_cpus = noop_target_cpus, | |
124 | .disable_esr = 0, | |
125 | .dest_logical = APIC_DEST_LOGICAL, | |
4c59f3e6 | 126 | .check_apicid_used = default_check_apicid_used, |
9844ab11 CG |
127 | |
128 | .vector_allocation_domain = noop_vector_allocation_domain, | |
129 | .init_apic_ldr = noop_init_apic_ldr, | |
130 | ||
7abc0753 | 131 | .ioapic_phys_id_map = default_ioapic_phys_id_map, |
9844ab11 | 132 | .setup_apic_routing = NULL, |
9844ab11 | 133 | |
9844ab11 | 134 | .cpu_present_to_apicid = default_cpu_present_to_apicid, |
7abc0753 | 135 | .apicid_to_cpu_present = physid_set_mask_of_physid, |
9844ab11 | 136 | |
9844ab11 | 137 | .check_phys_apicid_present = default_check_phys_apicid_present, |
9844ab11 | 138 | |
f88f2b4f | 139 | .phys_pkg_id = noop_phys_pkg_id, |
9844ab11 | 140 | |
9844ab11 CG |
141 | .get_apic_id = noop_get_apic_id, |
142 | .set_apic_id = NULL, | |
9844ab11 | 143 | |
6398268d | 144 | .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and, |
9844ab11 | 145 | |
4727da2e | 146 | .send_IPI = noop_send_IPI, |
9844ab11 CG |
147 | .send_IPI_mask = noop_send_IPI_mask, |
148 | .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself, | |
149 | .send_IPI_allbutself = noop_send_IPI_allbutself, | |
150 | .send_IPI_all = noop_send_IPI_all, | |
151 | .send_IPI_self = noop_send_IPI_self, | |
152 | ||
153 | .wakeup_secondary_cpu = noop_wakeup_secondary_cpu, | |
154 | ||
9844ab11 CG |
155 | .inquire_remote_apic = NULL, |
156 | ||
157 | .read = noop_apic_read, | |
158 | .write = noop_apic_write, | |
2a43195d | 159 | .eoi_write = noop_apic_write, |
9844ab11 CG |
160 | .icr_read = noop_apic_icr_read, |
161 | .icr_write = noop_apic_icr_write, | |
162 | .wait_icr_idle = noop_apic_wait_icr_idle, | |
163 | .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle, | |
acb8bc09 TH |
164 | |
165 | #ifdef CONFIG_X86_32 | |
166 | .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid, | |
167 | #endif | |
9844ab11 | 168 | }; |