1 #ifndef __ASM_SH_SYSTEM_H
2 #define __ASM_SH_SYSTEM_H
3
4 /*
5 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
6 */
7
8 #include <linux/config.h>
9
10 /*
11 * switch_to() should switch tasks to task nr n, first
12 */
13
14 typedef struct {
15 unsigned long seg;
16 } mm_segment_t;
17
18 #ifdef CONFIG_SMP
19 #error no SMP SuperH
20 #else
21 #define prepare_to_switch() do { } while(0)
22 #define switch_to(prev,next,last) do { \
23 register struct task_struct *__last; \
24 register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \
25 register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \
26 register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \
27 register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \
28 register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \
29 register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \
30 __asm__ __volatile__ (".balign 4\n\t" \
31 "stc.l $gbr, @-$r15\n\t" \
32 "sts.l $pr, @-$r15\n\t" \
33 "mov.l $r8, @-$r15\n\t" \
34 "mov.l $r9, @-$r15\n\t" \
35 "mov.l $r10, @-$r15\n\t" \
36 "mov.l $r11, @-$r15\n\t" \
37 "mov.l $r12, @-$r15\n\t" \
38 "mov.l $r13, @-$r15\n\t" \
39 "mov.l $r14, @-$r15\n\t" \
40 "mov.l $r15, @$r1 ! save SP\n\t" \
41 "mov.l @$r6, $r15 ! change to new stack\n\t" \
42 "mov.l %0, @-$r15 ! push R0 onto new stack\n\t" \
43 "mova 1f, %0\n\t" \
44 "mov.l %0, @$r2 ! save PC\n\t" \
45 "mov.l 2f, %0\n\t" \
46 "jmp @%0 ! call __switch_to\n\t" \
47 " lds $r7, $pr ! with return to new PC\n\t" \
48 ".balign 4\n" \
49 "2:\n\t" \
50 ".long " "__switch_to\n" \
51 "1:\n\t" \
52 "mov.l @$r15+, %0 ! pop R0 from new stack\n\t" \
53 "mov.l @$r15+, $r14\n\t" \
54 "mov.l @$r15+, $r13\n\t" \
55 "mov.l @$r15+, $r12\n\t" \
56 "mov.l @$r15+, $r11\n\t" \
57 "mov.l @$r15+, $r10\n\t" \
58 "mov.l @$r15+, $r9\n\t" \
59 "mov.l @$r15+, $r8\n\t" \
60 "lds.l @$r15+, $pr\n\t" \
61 "ldc.l @$r15+, $gbr\n\t" \
62 :"=&z" (__last) \
63 :"" (prev), \
64 "r" (__ts1), "r" (__ts2), \
65 "r" (__ts4), "r" (__ts5), "r" (__ts6), "r" (__ts7) \
66 :"r3", "t"); \
67 last = __last; \
68 } while (0)
69 #endif
70
71 #define nop() __asm__ __volatile__ ("nop")
72
73
74 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
75
76 static __inline__ unsigned long tas(volatile int *m)
77 { /* #define tas(ptr) (xchg((ptr),1)) */
78 unsigned long retval;
79
80 __asm__ __volatile__ ("tas.b @%1\n\t"
81 "movt %0"
82 : "=r" (retval): "r" (m): "t", "memory");
83 return retval;
84 }
85
86 extern void __xchg_called_with_bad_pointer(void);
87
88 #define mb() __asm__ __volatile__ ("": : :"memory")
89 #define rmb() mb()
90 #define wmb() __asm__ __volatile__ ("": : :"memory")
91
92 #ifdef CONFIG_SMP
93 #define smp_mb() mb()
94 #define smp_rmb() rmb()
95 #define smp_wmb() wmb()
96 #else
97 #define smp_mb() barrier()
98 #define smp_rmb() barrier()
99 #define smp_wmb() barrier()
100 #endif
101
102 #define set_mb(var, value) do { xchg(&var, value); } while (0)
103 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
104
105 /* Interrupt Control */
106 static __inline__ void __sti(void)
107 {
108 unsigned long __dummy0, __dummy1;
109
110 __asm__ __volatile__("stc $sr, %0\n\t"
111 "and %1, %0\n\t"
112 "stc $r6_bank, %1\n\t"
113 "or %1, %0\n\t"
114 "ldc %0, $sr"
115 : "=&r" (__dummy0), "=r" (__dummy1)
116 : "1" (~0x000000f0)
117 : "memory");
118 }
119
120 static __inline__ void __cli(void)
121 {
122 unsigned long __dummy;
123 __asm__ __volatile__("stc $sr, %0\n\t"
124 "or #0xf0, %0\n\t"
125 "ldc %0, $sr"
126 : "=&z" (__dummy)
127 : /* no inputs */
128 : "memory");
129 }
130
131 #define __save_flags(x) \
132 x = (__extension__ ({ unsigned long __sr; \
133 __asm__ __volatile__( \
134 "stc $sr, %0" \
135 : "=&r" (__sr) \
136 : /* no inputs */ \
137 : "memory"); \
138 (__sr & 0x000000f0);}))
139
140 #define __save_and_cli(x) \
141 x = (__extension__ ({ unsigned long __dummy,__sr; \
142 __asm__ __volatile__( \
143 "stc $sr, %1\n\t" \
144 "mov %1, %0\n\t" \
145 "or #0xf0, %0\n\t" \
146 "ldc %0, $sr" \
147 : "=&z" (__dummy), "=&r" (__sr) \
148 : /* no inputs */ \
149 : "memory"); (__sr & 0x000000f0); }))
150
151 #define __restore_flags(x) do { \
152 if (x != 0x000000f0) /* not CLI-ed? */ \
153 __sti(); \
154 } while (0)
155
156 /*
157 * Jump to P2 area.
158 * When handling TLB or caches, we need to do it from P2 area.
159 */
160 #define jump_to_P2() \
161 do { \
162 unsigned long __dummy; \
163 __asm__ __volatile__( \
164 "mov.l 1f, %0\n\t" \
165 "or %1, %0\n\t" \
166 "jmp @%0\n\t" \
167 " nop\n\t" \
168 ".balign 4\n" \
169 "1: .long 2f\n" \
170 "2:" \
171 : "=&r" (__dummy) \
172 : "r" (0x20000000)); \
173 } while (0)
174
175 /*
176 * Back to P1 area.
177 */
178 #define back_to_P1() \
179 do { \
180 unsigned long __dummy; \
181 __asm__ __volatile__( \
182 "nop;nop;nop;nop;nop;nop;nop\n\t" \
183 "mov.l 1f, %0\n\t" \
184 "jmp @%0\n\t" \
185 " nop\n\t" \
186 ".balign 4\n" \
187 "1: .long 2f\n" \
188 "2:" \
189 : "=&r" (__dummy)); \
190 } while (0)
191
192 /* For spinlocks etc */
193 #define local_irq_save(x) __save_and_cli(x)
194 #define local_irq_restore(x) __restore_flags(x)
195 #define local_irq_disable() __cli()
196 #define local_irq_enable() __sti()
197
198 #ifdef CONFIG_SMP
199
200 extern void __global_cli(void);
201 extern void __global_sti(void);
202 extern unsigned long __global_save_flags(void);
203 extern void __global_restore_flags(unsigned long);
204 #define cli() __global_cli()
205 #define sti() __global_sti()
206 #define save_flags(x) ((x)=__global_save_flags())
207 #define restore_flags(x) __global_restore_flags(x)
208
209 #else
210
211 #define cli() __cli()
212 #define sti() __sti()
213 #define save_flags(x) __save_flags(x)
214 #define save_and_cli(x) __save_and_cli(x)
215 #define restore_flags(x) __restore_flags(x)
216
217 #endif
218
219 static __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
220 {
221 unsigned long flags, retval;
222
223 save_and_cli(flags);
224 retval = *m;
225 *m = val;
226 restore_flags(flags);
227 return retval;
228 }
229
230 static __inline__ unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
231 {
232 unsigned long flags, retval;
233
234 save_and_cli(flags);
235 retval = *m;
236 *m = val & 0xff;
237 restore_flags(flags);
238 return retval;
239 }
240
241 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
242 {
243 switch (size) {
244 case 4:
245 return xchg_u32(ptr, x);
246 break;
247 case 1:
248 return xchg_u8(ptr, x);
249 break;
250 }
251 __xchg_called_with_bad_pointer();
252 return x;
253 }
254
255 /* XXX
256 * disable hlt during certain critical i/o operations
257 */
258 #define HAVE_DISABLE_HLT
259 void disable_hlt(void);
260 void enable_hlt(void);
261
262 #endif
263
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