Linux kernel mirror (for testing)
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1#ifndef __ASM_SH64_SYSTEM_H
2#define __ASM_SH64_SYSTEM_H
3
4/*
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 *
9 * include/asm-sh64/system.h
10 *
11 * Copyright (C) 2000, 2001 Paolo Alberelli
12 * Copyright (C) 2003 Paul Mundt
13 * Copyright (C) 2004 Richard Curnow
14 *
15 */
16
17#include <asm/registers.h>
18#include <asm/processor.h>
19
20/*
21 * switch_to() should switch tasks to task nr n, first
22 */
23
24typedef struct {
25 unsigned long seg;
26} mm_segment_t;
27
28extern struct task_struct *sh64_switch_to(struct task_struct *prev,
29 struct thread_struct *prev_thread,
30 struct task_struct *next,
31 struct thread_struct *next_thread);
32
33#define switch_to(prev,next,last) \
34 do {\
35 if (last_task_used_math != next) {\
36 struct pt_regs *regs = next->thread.uregs;\
37 if (regs) regs->sr |= SR_FD;\
38 }\
39 last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
40 } while(0)
41
42#define nop() __asm__ __volatile__ ("nop")
43
44#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
45
46#define tas(ptr) (xchg((ptr), 1))
47
48extern void __xchg_called_with_bad_pointer(void);
49
50#define mb() __asm__ __volatile__ ("synco": : :"memory")
51#define rmb() mb()
52#define wmb() __asm__ __volatile__ ("synco": : :"memory")
53#define read_barrier_depends() do { } while (0)
54
55#ifdef CONFIG_SMP
56#define smp_mb() mb()
57#define smp_rmb() rmb()
58#define smp_wmb() wmb()
59#define smp_read_barrier_depends() read_barrier_depends()
60#else
61#define smp_mb() barrier()
62#define smp_rmb() barrier()
63#define smp_wmb() barrier()
64#define smp_read_barrier_depends() do { } while (0)
65#endif /* CONFIG_SMP */
66
67#define set_rmb(var, value) do { (void)xchg(&var, value); } while (0)
68#define set_mb(var, value) set_rmb(var, value)
69
70/* Interrupt Control */
71#ifndef HARD_CLI
72#define SR_MASK_L 0x000000f0L
73#define SR_MASK_LL 0x00000000000000f0LL
74#else
75#define SR_MASK_L 0x10000000L
76#define SR_MASK_LL 0x0000000010000000LL
77#endif
78
79static __inline__ void local_irq_enable(void)
80{
81 /* cli/sti based on SR.BL */
82 unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
83
84 __asm__ __volatile__("getcon " __SR ", %0\n\t"
85 "and %0, %1, %0\n\t"
86 "putcon %0, " __SR "\n\t"
87 : "=&r" (__dummy0)
88 : "r" (__dummy1));
89}
90
91static __inline__ void local_irq_disable(void)
92{
93 /* cli/sti based on SR.BL */
94 unsigned long long __dummy0, __dummy1=SR_MASK_LL;
95 __asm__ __volatile__("getcon " __SR ", %0\n\t"
96 "or %0, %1, %0\n\t"
97 "putcon %0, " __SR "\n\t"
98 : "=&r" (__dummy0)
99 : "r" (__dummy1));
100}
101
102#define local_save_flags(x) \
103(__extension__ ({ unsigned long long __dummy=SR_MASK_LL; \
104 __asm__ __volatile__( \
105 "getcon " __SR ", %0\n\t" \
106 "and %0, %1, %0" \
107 : "=&r" (x) \
108 : "r" (__dummy));}))
109
110#define local_irq_save(x) \
111(__extension__ ({ unsigned long long __d2=SR_MASK_LL, __d1; \
112 __asm__ __volatile__( \
113 "getcon " __SR ", %1\n\t" \
114 "or %1, r63, %0\n\t" \
115 "or %1, %2, %1\n\t" \
116 "putcon %1, " __SR "\n\t" \
117 "and %0, %2, %0" \
118 : "=&r" (x), "=&r" (__d1) \
119 : "r" (__d2));}));
120
121#define local_irq_restore(x) do { \
122 if ( ((x) & SR_MASK_L) == 0 ) /* dropping to 0 ? */ \
123 local_irq_enable(); /* yes...re-enable */ \
124} while (0)
125
126#define irqs_disabled() \
127({ \
128 unsigned long flags; \
129 local_save_flags(flags); \
130 (flags != 0); \
131})
132
133static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
134{
135 unsigned long flags, retval;
136
137 local_irq_save(flags);
138 retval = *m;
139 *m = val;
140 local_irq_restore(flags);
141 return retval;
142}
143
144static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
145{
146 unsigned long flags, retval;
147
148 local_irq_save(flags);
149 retval = *m;
150 *m = val & 0xff;
151 local_irq_restore(flags);
152 return retval;
153}
154
155static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
156{
157 switch (size) {
158 case 4:
159 return xchg_u32(ptr, x);
160 break;
161 case 1:
162 return xchg_u8(ptr, x);
163 break;
164 }
165 __xchg_called_with_bad_pointer();
166 return x;
167}
168
169/* XXX
170 * disable hlt during certain critical i/o operations
171 */
172#define HAVE_DISABLE_HLT
173void disable_hlt(void);
174void enable_hlt(void);
175
176
177#define smp_mb() barrier()
178#define smp_rmb() barrier()
179#define smp_wmb() barrier()
180
181#ifdef CONFIG_SH_ALPHANUMERIC
182/* This is only used for debugging. */
183extern void print_seg(char *file,int line);
184#define PLS() print_seg(__FILE__,__LINE__)
185#else /* CONFIG_SH_ALPHANUMERIC */
186#define PLS()
187#endif /* CONFIG_SH_ALPHANUMERIC */
188
189#define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
190
191#define arch_align_stack(x) (x)
192
193#endif /* __ASM_SH64_SYSTEM_H */