1 /*
2 * SMP stuff which is common to all sub-architectures.
3 */
4 #include <linux/module.h>
5 #include <asm/smp.h>
6
7 DEFINE_PER_CPU(unsigned long, this_cpu_off);
8 EXPORT_PER_CPU_SYMBOL(this_cpu_off);
9
10 /* Initialize the CPU's GDT. This is either the boot CPU doing itself
11 (still using the master per-cpu area), or a CPU doing it for a
12 secondary which will soon come up. */
13 __cpuinit void init_gdt(int cpu)
14 {
15 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
16
17 pack_descriptor(&gdt[GDT_ENTRY_PERCPU],
18 __per_cpu_offset[cpu], 0xFFFFF,
19 0x2 | DESCTYPE_S, 0x8);
20
21 gdt[GDT_ENTRY_PERCPU].s = 1;
22
23 per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
24 per_cpu(cpu_number, cpu) = cpu;
25 }
26
27
28 /**
29 * smp_call_function(): Run a function on all other CPUs.
30 * @func: The function to run. This must be fast and non-blocking.
31 * @info: An arbitrary pointer to pass to the function.
32 * @nonatomic: Unused.
33 * @wait: If true, wait (atomically) until function has completed on other CPUs.
34 *
35 * Returns 0 on success, else a negative status code.
36 *
37 * If @wait is true, then returns once @func has returned; otherwise
38 * it returns just before the target cpu calls @func.
39 *
40 * You must not call this function with disabled interrupts or from a
41 * hardware interrupt handler or from a bottom half handler.
42 */
43 int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
44 int wait)
45 {
46 return smp_call_function_mask(cpu_online_map, func, info, wait);
47 }
48 EXPORT_SYMBOL(smp_call_function);
49
50 /**
51 * smp_call_function_single - Run a function on a specific CPU
52 * @cpu: The target CPU. Cannot be the calling CPU.
53 * @func: The function to run. This must be fast and non-blocking.
54 * @info: An arbitrary pointer to pass to the function.
55 * @nonatomic: Unused.
56 * @wait: If true, wait until function has completed on other CPUs.
57 *
58 * Returns 0 on success, else a negative status code.
59 *
60 * If @wait is true, then returns once @func has returned; otherwise
61 * it returns just before the target cpu calls @func.
62 */
63 int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
64 int nonatomic, int wait)
65 {
66 /* prevent preemption and reschedule on another processor */
67 int ret;
68 int me = get_cpu();
69 if (cpu == me) {
70 local_irq_disable();
71 func(info);
72 local_irq_enable();
73 put_cpu();
74 return 0;
75 }
76
77 ret = smp_call_function_mask(cpumask_of_cpu(cpu), func, info, wait);
78
79 put_cpu();
80 return ret;
81 }
82 EXPORT_SYMBOL(smp_call_function_single);
83
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