1
2
3
4
5
6
7
8
9
10
11#ifndef __ASM_SYSTEM_H
12#define __ASM_SYSTEM_H
13
14#include <linux/config.h>
15#ifdef __KERNEL__
16#include <asm/lowcore.h>
17#endif
18#include <linux/kernel.h>
19
20#define prepare_to_switch() do { } while(0)
21#define switch_to(prev,next,last) do { \
22 if (prev == next) \
23 break; \
24 save_fp_regs1(&prev->thread.fp_regs); \
25 restore_fp_regs1(&next->thread.fp_regs); \
26 last = resume(&prev->thread,&next->thread); \
27} while (0)
28
29struct task_struct;
30
31#define nop() __asm__ __volatile__ ("nop")
32
33#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
34
35extern void __misaligned_u16(void);
36extern void __misaligned_u32(void);
37
38static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
39{
40 switch (size) {
41 case 1:
42 asm volatile (
43 " lhi 1,3\n"
44 " nr 1,%0\n"
45 " xr %0,1\n"
46 " bras 2,0f\n"
47 " icm 1,8,3(%1)\n"
48 " stcm 0,8,3(%1)\n"
49 " icm 1,4,3(%1)\n"
50 " stcm 0,4,3(%1)\n"
51 " icm 1,2,3(%1)\n"
52 " stcm 0,2,3(%1)\n"
53 " icm 1,1,3(%1)\n"
54 " stcm 0,1,3(%1)\n"
55 "0: sll 1,3\n"
56 " la 2,0(1,2)\n"
57 " l 0,0(%0)\n"
58 "1: lr 1,0\n"
59 " ex 0,0(2)\n"
60 " cs 0,1,0(%0)\n"
61 " jl 1b\n"
62 " ex 0,4(2)"
63 : "+a&" (ptr) : "a" (&x)
64 : "memory", "cc", "0", "1", "2");
65 break;
66 case 2:
67 if(((__u32)ptr)&1)
68 __misaligned_u16();
69 asm volatile (
70 " lhi 1,2\n"
71 " nr 1,%0\n"
72 " xr %0,1\n"
73 " bras 2,0f\n"
74 " icm 1,12,2(%1)\n"
75 " stcm 0,12,2(%1)\n"
76 " icm 1,3,2(%1)\n"
77 " stcm 0,3,2(%1)\n"
78 "0: sll 1,2\n"
79 " la 2,0(1,2)\n"
80 " l 0,0(%0)\n"
81 "1: lr 1,0\n"
82 " ex 0,0(2)\n"
83 " cs 0,1,0(%0)\n"
84 " jl 1b\n"
85 " ex 0,4(2)"
86 : "+a&" (ptr) : "a" (&x)
87 : "memory", "cc", "0", "1", "2");
88 break;
89 case 4:
90 if(((__u32)ptr)&3)
91 __misaligned_u32();
92 asm volatile (
93 " l 0,0(%1)\n"
94 "0: cs 0,%0,0(%1)\n"
95 " jl 0b\n"
96 " lr %0,0\n"
97 : "+d&" (x) : "a" (ptr)
98 : "memory", "cc", "0" );
99 break;
100 default:
101 abort();
102 }
103 return x;
104}
105
106
107
108
109
110
111
112
113
114
115
116#define eieio() __asm__ __volatile__ ("BCR 15,0")
117# define SYNC_OTHER_CORES(x) eieio()
118#define mb() eieio()
119#define rmb() eieio()
120#define wmb() eieio()
121#define smp_mb() mb()
122#define smp_rmb() rmb()
123#define smp_wmb() wmb()
124#define smp_mb__before_clear_bit() smp_mb()
125#define smp_mb__after_clear_bit() smp_mb()
126
127
128#define set_mb(var, value) do { var = value; mb(); } while (0)
129#define set_wmb(var, value) do { var = value; wmb(); } while (0)
130
131
132#define __sti() ({ \
133 __u8 dummy; \
134 __asm__ __volatile__ ( \
135 "stosm %0,0x03" : "=m" (dummy) : : "memory"); \
136 })
137
138#define __cli() ({ \
139 __u32 flags; \
140 __asm__ __volatile__ ( \
141 "stnsm %0,0xFC" : "=m" (flags) : : "memory"); \
142 flags; \
143 })
144
145#define __save_flags(x) \
146 __asm__ __volatile__("stosm %0,0" : "=m" (x) : : "memory")
147
148#define __restore_flags(x) \
149 __asm__ __volatile__("ssm %0" : : "m" (x) : "memory")
150
151#define __load_psw(psw) \
152 __asm__ __volatile__("lpsw %0" : : "m" (psw) : "cc" );
153
154#define __ctl_load(array, low, high) ({ \
155 __asm__ __volatile__ ( \
156 " la 1,%0\n" \
157 " bras 2,0f\n" \
158 " lctl 0,0,0(1)\n" \
159 "0: ex %1,0(2)" \
160 : : "m" (array), "a" (((low)<<4)+(high)) : "1", "2" ); \
161 })
162
163#define __ctl_store(array, low, high) ({ \
164 __asm__ __volatile__ ( \
165 " la 1,%0\n" \
166 " bras 2,0f\n" \
167 " stctl 0,0,0(1)\n" \
168 "0: ex %1,0(2)" \
169 : "=m" (array) : "a" (((low)<<4)+(high)): "1", "2" ); \
170 })
171
172#define __ctl_set_bit(cr, bit) ({ \
173 __u8 dummy[16]; \
174 __asm__ __volatile__ ( \
175 " la 1,%0\n" \
176 " ahi 1,7\n" \
177 " srl 1,3\n" \
178 " sll 1,3\n" \
179 " bras 2,0f\n" \
180 " stctl 0,0,0(1)\n" \
181 " lctl 0,0,0(1)\n" \
182 "0: ex %1,0(2)\n" \
183 " l 0,0(1)\n" \
184 " or 0,%2\n" \
185 " st 0,0(1)\n" \
186 "1: ex %1,4(2)" \
187 : "=m" (dummy) : "a" (cr*17), "a" (1<<(bit)) \
188 : "cc", "0", "1", "2"); \
189 })
190
191#define __ctl_clear_bit(cr, bit) ({ \
192 __u8 dummy[16]; \
193 __asm__ __volatile__ ( \
194 " la 1,%0\n" \
195 " ahi 1,7\n" \
196 " srl 1,3\n" \
197 " sll 1,3\n" \
198 " bras 2,0f\n" \
199 " stctl 0,0,0(1)\n" \
200 " lctl 0,0,0(1)\n" \
201 "0: ex %1,0(2)\n" \
202 " l 0,0(1)\n" \
203 " nr 0,%2\n" \
204 " st 0,0(1)\n" \
205 "1: ex %1,4(2)" \
206 : "=m" (dummy) : "a" (cr*17), "a" (~(1<<(bit))) \
207 : "cc", "0", "1", "2"); \
208 })
209
210
211#define local_irq_save(x) ((x) = __cli())
212#define local_irq_restore(x) __restore_flags(x)
213#define local_irq_disable() __cli()
214#define local_irq_enable() __sti()
215
216#ifdef CONFIG_SMP
217
218extern void __global_cli(void);
219extern void __global_sti(void);
220
221extern unsigned long __global_save_flags(void);
222extern void __global_restore_flags(unsigned long);
223#define cli() __global_cli()
224#define sti() __global_sti()
225#define save_flags(x) ((x)=__global_save_flags())
226#define restore_flags(x) __global_restore_flags(x)
227
228extern void smp_ctl_set_bit(int cr, int bit);
229extern void smp_ctl_clear_bit(int cr, int bit);
230#define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
231#define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
232
233#else
234
235#define cli() __cli()
236#define sti() __sti()
237#define save_flags(x) __save_flags(x)
238#define restore_flags(x) __restore_flags(x)
239
240#define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
241#define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
242
243
244#endif
245
246#ifdef __KERNEL__
247extern struct task_struct *resume(void *,void *);
248
249extern int save_fp_regs1(s390_fp_regs *fpregs);
250extern void save_fp_regs(s390_fp_regs *fpregs);
251extern int restore_fp_regs1(s390_fp_regs *fpregs);
252extern void restore_fp_regs(s390_fp_regs *fpregs);
253#endif
254
255#endif
256
257
258
259
