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 #include <linux/config.h>
12 #ifdef CONFIG_SMP
13 #ifndef __ASSEMBLY__
14
15 #include <asm/lowcore.h>
16 #include <linux/tasks.h> // FOR NR_CPUS definition only.
17 #include <linux/kernel.h> // FOR FASTCALL definition
18
19 #define smp_processor_id() (current->processor)
20 #define NO_PROC_ID 0xFF /* No processor magic marker */
21
22 /*
23 * This magic constant controls our willingness to transfer
24 * a process across CPUs. Such a transfer incurs misses on the L1
25 * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
26 * gut feeling is this will vary by board in value. For a board
27 * with separate L2 cache it probably depends also on the RSS, and
28 * for a board with shared L2 cache it ought to decay fast as other
29 * processes are run.
30 */
31
32 #define PROC_CHANGE_PENALTY 20 /* Schedule penalty */
33
34 extern unsigned long ipi_count;
35 extern void count_cpus(void);
36
37 extern __inline__ int cpu_logical_map(int cpu)
38 {
39 return cpu;
40 }
41
42 extern __inline__ int cpu_number_map(int cpu)
43 {
44 return cpu;
45 }
46
47 extern __inline__ __u16 hard_smp_processor_id(void)
48 {
49 __u16 cpu_address;
50
51 __asm__ ("stap %0\n" : "=m" (cpu_address));
52 return cpu_address;
53 }
54
55 #define cpu_logical_map(cpu) (cpu)
56
57 void smp_local_timer_interrupt(struct pt_regs * regs);
58
59 /*
60 s390 specific smp.c headers
61 */
62 typedef struct
63 {
64 int intresting;
65 sigp_ccode ccode;
66 __u32 status;
67 __u16 cpu;
68 } sigp_info;
69
70 sigp_ccode smp_ext_call_sync(int cpu, ec_cmd_sig cmd,void *parms);
71 sigp_ccode smp_ext_call_async(int cpu, ec_bit_sig sig);
72 void smp_ext_call_sync_others(ec_cmd_sig cmd, void *parms);
73 void smp_ext_call_async_others(ec_bit_sig sig);
74
75 int smp_signal_others(sigp_order_code order_code,__u32 parameter,
76 int spin,sigp_info *info);
77 #endif
78 #endif
79 #endif
80
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