File: /usr/src/linux/include/asm-s390x/smp.h

1     /*
2      *  include/asm-s390/smp.h
3      *
4      *  S390 version
5      *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6      *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
7      *               Martin Schwidefsky (schwidefsky@de.ibm.com)
8      */
9     #ifndef __ASM_SMP_H
10     #define __ASM_SMP_H
11     
12     #include <linux/config.h>
13     
14     #if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
15     
16     #include <asm/lowcore.h>
17     
18     /*
19       s390 specific smp.c headers
20      */
21     typedef struct
22     {
23     	int        intresting;
24     	sigp_ccode ccode; 
25     	__u32      status;
26     	__u16      cpu;
27     } sigp_info;
28     
29     #define NO_PROC_ID		0xFF		/* No processor magic marker */
30     
31     /*
32      *	This magic constant controls our willingness to transfer
33      *	a process across CPUs. Such a transfer incurs misses on the L1
34      *	cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
35      *	gut feeling is this will vary by board in value. For a board
36      *	with separate L2 cache it probably depends also on the RSS, and
37      *	for a board with shared L2 cache it ought to decay fast as other
38      *	processes are run.
39      */
40      
41     #define PROC_CHANGE_PENALTY	20		/* Schedule penalty */
42     
43     #define smp_processor_id() (current->processor)
44     
45     extern __inline__ int cpu_logical_map(int cpu)
46     {
47             return cpu;
48     }
49     
50     extern __inline__ int cpu_number_map(int cpu)
51     {
52             return cpu;
53     }
54     
55     extern __inline__ __u16 hard_smp_processor_id(void)
56     {
57             __u16 cpu_address;
58      
59             __asm__ ("stap %0\n" : "=m" (cpu_address));
60             return cpu_address;
61     }
62     
63     #define cpu_logical_map(cpu) (cpu)
64     
65     void smp_local_timer_interrupt(struct pt_regs * regs);
66     
67     sigp_ccode smp_ext_call(int cpu, void (*cb)(void *info), void *info, int wait);
68     void smp_ext_call_others(void (*cb)(void *info), void *info, int wait);
69     sigp_ccode smp_ext_bitcall(int cpu, ec_bit_sig sig);
70     void smp_ext_bitcall_others(ec_bit_sig sig);
71     
72     int smp_signal_others(sigp_order_code order_code,__u32 parameter,
73                           int spin,sigp_info *info);
74     #endif
75     #endif
76