smp.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_SMP_H
 3#define __ASM_SMP_H
 4
 5#include <linux/threads.h>
 6#include <linux/cpumask.h>
 7#include <linux/bitops.h>
 8#include <asm/pal.h>
 9
10/* HACK: Cabrio WHAMI return value is bogus if more than 8 bits used.. :-( */
11
12static __inline__ unsigned char
13__hard_smp_processor_id(void)
14{
15	register unsigned char __r0 __asm__("$0");
16	__asm__ __volatile__(
17		"call_pal %1 #whami"
18		: "=r"(__r0)
19		:"i" (PAL_whami)
20		: "$1", "$22", "$23", "$24", "$25");
21	return __r0;
22}
23
24#ifdef CONFIG_SMP
25
26#include <asm/irq.h>
27
28struct cpuinfo_alpha {
29	unsigned long loops_per_jiffy;
30	unsigned long last_asn;
31	int need_new_asn;
32	int asn_lock;
33	unsigned long ipi_count;
34	unsigned long prof_multiplier;
35	unsigned long prof_counter;
36	unsigned char mcheck_expected;
37	unsigned char mcheck_taken;
38	unsigned char mcheck_extra;
39} __attribute__((aligned(64)));
40
41extern struct cpuinfo_alpha cpu_data[NR_CPUS];
42
43#define hard_smp_processor_id()	__hard_smp_processor_id()
44#define raw_smp_processor_id()	(current_thread_info()->cpu)
45
46extern int smp_num_cpus;
47
48extern void arch_send_call_function_single_ipi(int cpu);
49extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
50
51#else /* CONFIG_SMP */
52
53#define hard_smp_processor_id()		0
54#define smp_call_function_on_cpu(func,info,wait,cpu)    ({ 0; })
55
56#endif /* CONFIG_SMP */
57
58#define NO_PROC_ID	(-1)
59
60#endif