1/*
 2 * ARM specific SMP header, this contains our implementation
 3 * details.
 4 */
 5#ifndef __ASMARM_SMP_PLAT_H
 6#define __ASMARM_SMP_PLAT_H
 7
 
 
 
 8#include <asm/cputype.h>
 9
10/*
11 * Return true if we are running on a SMP platform
12 */
13static inline bool is_smp(void)
14{
15#ifndef CONFIG_SMP
16	return false;
17#elif defined(CONFIG_SMP_ON_UP)
18	extern unsigned int smp_on_up;
19	return !!smp_on_up;
20#else
21	return true;
22#endif
23}
24
25/* all SMP configurations have the extended CPUID registers */
 
 
 
26static inline int tlb_ops_need_broadcast(void)
27{
28	if (!is_smp())
29		return 0;
30
31	return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2;
32}
 
33
34#if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7
35#define cache_ops_need_broadcast()	0
36#else
37static inline int cache_ops_need_broadcast(void)
38{
39	if (!is_smp())
40		return 0;
41
42	return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 1;
43}
44#endif
45
46/*
47 * Logical CPU mapping.
48 */
49extern int __cpu_logical_map[];
50#define cpu_logical_map(cpu)	__cpu_logical_map[cpu]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
51
52#endif

 1/*
 2 * ARM specific SMP header, this contains our implementation
 3 * details.
 4 */
 5#ifndef __ASMARM_SMP_PLAT_H
 6#define __ASMARM_SMP_PLAT_H
 7
 8#include <linux/cpumask.h>
 9#include <linux/err.h>
10
11#include <asm/cputype.h>
12
13/*
14 * Return true if we are running on a SMP platform
15 */
16static inline bool is_smp(void)
17{
18#ifndef CONFIG_SMP
19	return false;
20#elif defined(CONFIG_SMP_ON_UP)
21	extern unsigned int smp_on_up;
22	return !!smp_on_up;
23#else
24	return true;
25#endif
26}
27
28/* all SMP configurations have the extended CPUID registers */
29#ifndef CONFIG_MMU
30#define tlb_ops_need_broadcast()	0
31#else
32static inline int tlb_ops_need_broadcast(void)
33{
34	if (!is_smp())
35		return 0;
36
37	return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2;
38}
39#endif
40
41#if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7
42#define cache_ops_need_broadcast()	0
43#else
44static inline int cache_ops_need_broadcast(void)
45{
46	if (!is_smp())
47		return 0;
48
49	return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 1;
50}
51#endif
52
53/*
54 * Logical CPU mapping.
55 */
56extern u32 __cpu_logical_map[];
57#define cpu_logical_map(cpu)	__cpu_logical_map[cpu]
58/*
59 * Retrieve logical cpu index corresponding to a given MPIDR[23:0]
60 *  - mpidr: MPIDR[23:0] to be used for the look-up
61 *
62 * Returns the cpu logical index or -EINVAL on look-up error
63 */
64static inline int get_logical_index(u32 mpidr)
65{
66	int cpu;
67	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
68		if (cpu_logical_map(cpu) == mpidr)
69			return cpu;
70	return -EINVAL;
71}
72
73/*
74 * NOTE ! Assembly code relies on the following
75 * structure memory layout in order to carry out load
76 * multiple from its base address. For more
77 * information check arch/arm/kernel/sleep.S
78 */
79struct mpidr_hash {
80	u32	mask; /* used by sleep.S */
81	u32	shift_aff[3]; /* used by sleep.S */
82	u32	bits;
83};
84
85extern struct mpidr_hash mpidr_hash;
86
87static inline u32 mpidr_hash_size(void)
88{
89	return 1 << mpidr_hash.bits;
90}
91
92extern int platform_can_cpu_hotplug(void);
93
94#endif