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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 <linux/config.h> | |
18 | #include <asm/registers.h> | |
19 | #include <asm/processor.h> | |
20 | ||
21 | /* | |
22 | * switch_to() should switch tasks to task nr n, first | |
23 | */ | |
24 | ||
25 | typedef struct { | |
26 | unsigned long seg; | |
27 | } mm_segment_t; | |
28 | ||
29 | extern struct task_struct *sh64_switch_to(struct task_struct *prev, | |
30 | struct thread_struct *prev_thread, | |
31 | struct task_struct *next, | |
32 | struct thread_struct *next_thread); | |
33 | ||
34 | #define switch_to(prev,next,last) \ | |
35 | do {\ | |
36 | if (last_task_used_math != next) {\ | |
37 | struct pt_regs *regs = next->thread.uregs;\ | |
38 | if (regs) regs->sr |= SR_FD;\ | |
39 | }\ | |
40 | last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\ | |
41 | } while(0) | |
42 | ||
43 | #define nop() __asm__ __volatile__ ("nop") | |
44 | ||
45 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
46 | ||
47 | #define tas(ptr) (xchg((ptr), 1)) | |
48 | ||
49 | extern void __xchg_called_with_bad_pointer(void); | |
50 | ||
51 | #define mb() __asm__ __volatile__ ("synco": : :"memory") | |
52 | #define rmb() mb() | |
53 | #define wmb() __asm__ __volatile__ ("synco": : :"memory") | |
54 | #define read_barrier_depends() do { } while (0) | |
55 | ||
56 | #ifdef CONFIG_SMP | |
57 | #define smp_mb() mb() | |
58 | #define smp_rmb() rmb() | |
59 | #define smp_wmb() wmb() | |
60 | #define smp_read_barrier_depends() read_barrier_depends() | |
61 | #else | |
62 | #define smp_mb() barrier() | |
63 | #define smp_rmb() barrier() | |
64 | #define smp_wmb() barrier() | |
65 | #define smp_read_barrier_depends() do { } while (0) | |
66 | #endif /* CONFIG_SMP */ | |
67 | ||
68 | #define set_rmb(var, value) do { xchg(&var, value); } while (0) | |
69 | #define set_mb(var, value) set_rmb(var, value) | |
70 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) | |
71 | ||
72 | /* Interrupt Control */ | |
73 | #ifndef HARD_CLI | |
74 | #define SR_MASK_L 0x000000f0L | |
75 | #define SR_MASK_LL 0x00000000000000f0LL | |
76 | #else | |
77 | #define SR_MASK_L 0x10000000L | |
78 | #define SR_MASK_LL 0x0000000010000000LL | |
79 | #endif | |
80 | ||
81 | static __inline__ void local_irq_enable(void) | |
82 | { | |
83 | /* cli/sti based on SR.BL */ | |
84 | unsigned long long __dummy0, __dummy1=~SR_MASK_LL; | |
85 | ||
86 | __asm__ __volatile__("getcon " __SR ", %0\n\t" | |
87 | "and %0, %1, %0\n\t" | |
88 | "putcon %0, " __SR "\n\t" | |
89 | : "=&r" (__dummy0) | |
90 | : "r" (__dummy1)); | |
91 | } | |
92 | ||
93 | static __inline__ void local_irq_disable(void) | |
94 | { | |
95 | /* cli/sti based on SR.BL */ | |
96 | unsigned long long __dummy0, __dummy1=SR_MASK_LL; | |
97 | __asm__ __volatile__("getcon " __SR ", %0\n\t" | |
98 | "or %0, %1, %0\n\t" | |
99 | "putcon %0, " __SR "\n\t" | |
100 | : "=&r" (__dummy0) | |
101 | : "r" (__dummy1)); | |
102 | } | |
103 | ||
104 | #define local_save_flags(x) \ | |
105 | (__extension__ ({ unsigned long long __dummy=SR_MASK_LL; \ | |
106 | __asm__ __volatile__( \ | |
107 | "getcon " __SR ", %0\n\t" \ | |
108 | "and %0, %1, %0" \ | |
109 | : "=&r" (x) \ | |
110 | : "r" (__dummy));})) | |
111 | ||
112 | #define local_irq_save(x) \ | |
113 | (__extension__ ({ unsigned long long __d2=SR_MASK_LL, __d1; \ | |
114 | __asm__ __volatile__( \ | |
115 | "getcon " __SR ", %1\n\t" \ | |
116 | "or %1, r63, %0\n\t" \ | |
117 | "or %1, %2, %1\n\t" \ | |
118 | "putcon %1, " __SR "\n\t" \ | |
119 | "and %0, %2, %0" \ | |
120 | : "=&r" (x), "=&r" (__d1) \ | |
121 | : "r" (__d2));})); | |
122 | ||
123 | #define local_irq_restore(x) do { \ | |
124 | if ( ((x) & SR_MASK_L) == 0 ) /* dropping to 0 ? */ \ | |
125 | local_irq_enable(); /* yes...re-enable */ \ | |
126 | } while (0) | |
127 | ||
128 | #define irqs_disabled() \ | |
129 | ({ \ | |
130 | unsigned long flags; \ | |
131 | local_save_flags(flags); \ | |
132 | (flags != 0); \ | |
133 | }) | |
134 | ||
ca5ed2f5 | 135 | static inline unsigned long xchg_u32(volatile int * m, unsigned long val) |
1da177e4 LT |
136 | { |
137 | unsigned long flags, retval; | |
138 | ||
139 | local_irq_save(flags); | |
140 | retval = *m; | |
141 | *m = val; | |
142 | local_irq_restore(flags); | |
143 | return retval; | |
144 | } | |
145 | ||
ca5ed2f5 | 146 | static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val) |
1da177e4 LT |
147 | { |
148 | unsigned long flags, retval; | |
149 | ||
150 | local_irq_save(flags); | |
151 | retval = *m; | |
152 | *m = val & 0xff; | |
153 | local_irq_restore(flags); | |
154 | return retval; | |
155 | } | |
156 | ||
157 | static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size) | |
158 | { | |
159 | switch (size) { | |
160 | case 4: | |
161 | return xchg_u32(ptr, x); | |
162 | break; | |
163 | case 1: | |
164 | return xchg_u8(ptr, x); | |
165 | break; | |
166 | } | |
167 | __xchg_called_with_bad_pointer(); | |
168 | return x; | |
169 | } | |
170 | ||
171 | /* XXX | |
172 | * disable hlt during certain critical i/o operations | |
173 | */ | |
174 | #define HAVE_DISABLE_HLT | |
175 | void disable_hlt(void); | |
176 | void enable_hlt(void); | |
177 | ||
178 | ||
179 | #define smp_mb() barrier() | |
180 | #define smp_rmb() barrier() | |
181 | #define smp_wmb() barrier() | |
182 | ||
183 | #ifdef CONFIG_SH_ALPHANUMERIC | |
184 | /* This is only used for debugging. */ | |
185 | extern void print_seg(char *file,int line); | |
186 | #define PLS() print_seg(__FILE__,__LINE__) | |
187 | #else /* CONFIG_SH_ALPHANUMERIC */ | |
188 | #define PLS() | |
189 | #endif /* CONFIG_SH_ALPHANUMERIC */ | |
190 | ||
191 | #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__) | |
192 | ||
193 | #define arch_align_stack(x) (x) | |
194 | ||
195 | #endif /* __ASM_SH64_SYSTEM_H */ |