ARM: mmp: fix potential NULL dereference
[linux/fpc-iii.git] / arch / x86 / kernel / apic / probe_32.c
blobeb35ef9ee63f779bde870822a01dcc98bd503b01
1 /*
2 * Default generic APIC driver. This handles up to 8 CPUs.
4 * Copyright 2003 Andi Kleen, SuSE Labs.
5 * Subject to the GNU Public License, v.2
7 * Generic x86 APIC driver probe layer.
8 */
9 #include <linux/threads.h>
10 #include <linux/cpumask.h>
11 #include <linux/module.h>
12 #include <linux/string.h>
13 #include <linux/kernel.h>
14 #include <linux/ctype.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <asm/fixmap.h>
18 #include <asm/mpspec.h>
19 #include <asm/apicdef.h>
20 #include <asm/apic.h>
21 #include <asm/setup.h>
23 #include <linux/smp.h>
24 #include <asm/ipi.h>
26 #include <linux/interrupt.h>
27 #include <asm/acpi.h>
28 #include <asm/e820.h>
30 #ifdef CONFIG_HOTPLUG_CPU
31 #define DEFAULT_SEND_IPI (1)
32 #else
33 #define DEFAULT_SEND_IPI (0)
34 #endif
36 int no_broadcast = DEFAULT_SEND_IPI;
38 static __init int no_ipi_broadcast(char *str)
40 get_option(&str, &no_broadcast);
41 pr_info("Using %s mode\n",
42 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
43 return 1;
45 __setup("no_ipi_broadcast=", no_ipi_broadcast);
47 static int __init print_ipi_mode(void)
49 pr_info("Using IPI %s mode\n",
50 no_broadcast ? "No-Shortcut" : "Shortcut");
51 return 0;
53 late_initcall(print_ipi_mode);
55 static int default_x86_32_early_logical_apicid(int cpu)
57 return 1 << cpu;
60 static void setup_apic_flat_routing(void)
62 #ifdef CONFIG_X86_IO_APIC
63 printk(KERN_INFO
64 "Enabling APIC mode: Flat. Using %d I/O APICs\n",
65 nr_ioapics);
66 #endif
69 /* should be called last. */
70 static int probe_default(void)
72 return 1;
75 static struct apic apic_default = {
77 .name = "default",
78 .probe = probe_default,
79 .acpi_madt_oem_check = NULL,
80 .apic_id_valid = default_apic_id_valid,
81 .apic_id_registered = default_apic_id_registered,
83 .irq_delivery_mode = dest_LowestPrio,
84 /* logical delivery broadcast to all CPUs: */
85 .irq_dest_mode = 1,
87 .target_cpus = default_target_cpus,
88 .disable_esr = 0,
89 .dest_logical = APIC_DEST_LOGICAL,
90 .check_apicid_used = default_check_apicid_used,
91 .check_apicid_present = default_check_apicid_present,
93 .vector_allocation_domain = flat_vector_allocation_domain,
94 .init_apic_ldr = default_init_apic_ldr,
96 .ioapic_phys_id_map = default_ioapic_phys_id_map,
97 .setup_apic_routing = setup_apic_flat_routing,
98 .multi_timer_check = NULL,
99 .cpu_present_to_apicid = default_cpu_present_to_apicid,
100 .apicid_to_cpu_present = physid_set_mask_of_physid,
101 .setup_portio_remap = NULL,
102 .check_phys_apicid_present = default_check_phys_apicid_present,
103 .enable_apic_mode = NULL,
104 .phys_pkg_id = default_phys_pkg_id,
105 .mps_oem_check = NULL,
107 .get_apic_id = default_get_apic_id,
108 .set_apic_id = NULL,
109 .apic_id_mask = 0x0F << 24,
111 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
113 .send_IPI_mask = default_send_IPI_mask_logical,
114 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_logical,
115 .send_IPI_allbutself = default_send_IPI_allbutself,
116 .send_IPI_all = default_send_IPI_all,
117 .send_IPI_self = default_send_IPI_self,
119 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
120 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
122 .wait_for_init_deassert = default_wait_for_init_deassert,
124 .smp_callin_clear_local_apic = NULL,
125 .inquire_remote_apic = default_inquire_remote_apic,
127 .read = native_apic_mem_read,
128 .write = native_apic_mem_write,
129 .eoi_write = native_apic_mem_write,
130 .icr_read = native_apic_icr_read,
131 .icr_write = native_apic_icr_write,
132 .wait_icr_idle = native_apic_wait_icr_idle,
133 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
135 .x86_32_early_logical_apicid = default_x86_32_early_logical_apicid,
138 apic_driver(apic_default);
140 struct apic *apic = &apic_default;
141 EXPORT_SYMBOL_GPL(apic);
143 static int cmdline_apic __initdata;
144 static int __init parse_apic(char *arg)
146 struct apic **drv;
148 if (!arg)
149 return -EINVAL;
151 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
152 if (!strcmp((*drv)->name, arg)) {
153 apic = *drv;
154 cmdline_apic = 1;
155 return 0;
159 /* Parsed again by __setup for debug/verbose */
160 return 0;
162 early_param("apic", parse_apic);
164 void __init default_setup_apic_routing(void)
166 int version = apic_version[boot_cpu_physical_apicid];
168 if (num_possible_cpus() > 8) {
169 switch (boot_cpu_data.x86_vendor) {
170 case X86_VENDOR_INTEL:
171 if (!APIC_XAPIC(version)) {
172 def_to_bigsmp = 0;
173 break;
175 /* If P4 and above fall through */
176 case X86_VENDOR_AMD:
177 def_to_bigsmp = 1;
181 #ifdef CONFIG_X86_BIGSMP
183 * This is used to switch to bigsmp mode when
184 * - There is no apic= option specified by the user
185 * - generic_apic_probe() has chosen apic_default as the sub_arch
186 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
189 if (!cmdline_apic && apic == &apic_default)
190 generic_bigsmp_probe();
191 #endif
193 if (apic->setup_apic_routing)
194 apic->setup_apic_routing();
196 if (x86_platform.apic_post_init)
197 x86_platform.apic_post_init();
200 void __init generic_apic_probe(void)
202 if (!cmdline_apic) {
203 struct apic **drv;
205 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
206 if ((*drv)->probe()) {
207 apic = *drv;
208 break;
211 /* Not visible without early console */
212 if (drv == __apicdrivers_end)
213 panic("Didn't find an APIC driver");
215 printk(KERN_INFO "Using APIC driver %s\n", apic->name);
218 /* These functions can switch the APIC even after the initial ->probe() */
220 int __init
221 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
223 struct apic **drv;
225 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
226 if (!((*drv)->mps_oem_check))
227 continue;
228 if (!(*drv)->mps_oem_check(mpc, oem, productid))
229 continue;
231 if (!cmdline_apic) {
232 apic = *drv;
233 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
234 apic->name);
236 return 1;
238 return 0;
241 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
243 struct apic **drv;
245 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
246 if (!(*drv)->acpi_madt_oem_check)
247 continue;
248 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
249 continue;
251 if (!cmdline_apic) {
252 apic = *drv;
253 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
254 apic->name);
256 return 1;
258 return 0;