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
46extern void __xchg_called_with_bad_pointer(void);
47
48#define mb()	__asm__ __volatile__ ("synco": : :"memory")
49#define rmb()	mb()
50#define wmb()	__asm__ __volatile__ ("synco": : :"memory")
51#define read_barrier_depends()	do { } while (0)
52
53#ifdef CONFIG_SMP
54#define smp_mb()	mb()
55#define smp_rmb()	rmb()
56#define smp_wmb()	wmb()
57#define smp_read_barrier_depends()	read_barrier_depends()
58#else
59#define smp_mb()	barrier()
60#define smp_rmb()	barrier()
61#define smp_wmb()	barrier()
62#define smp_read_barrier_depends()	do { } while (0)
63#endif /* CONFIG_SMP */
64
65#define set_rmb(var, value) do { (void)xchg(&var, value); } while (0)
66#define set_mb(var, value) set_rmb(var, value)
67
68/* Interrupt Control */
69#ifndef HARD_CLI
70#define SR_MASK_L 0x000000f0L
71#define SR_MASK_LL 0x00000000000000f0LL
72#else
73#define SR_MASK_L 0x10000000L
74#define SR_MASK_LL 0x0000000010000000LL
75#endif
76
77static __inline__ void local_irq_enable(void)
78{
79	/* cli/sti based on SR.BL */
80	unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
81
82	__asm__ __volatile__("getcon	" __SR ", %0\n\t"
83			     "and	%0, %1, %0\n\t"
84			     "putcon	%0, " __SR "\n\t"
85			     : "=&r" (__dummy0)
86			     : "r" (__dummy1));
87}
88
89static __inline__ void local_irq_disable(void)
90{
91	/* cli/sti based on SR.BL */
92	unsigned long long __dummy0, __dummy1=SR_MASK_LL;
93	__asm__ __volatile__("getcon	" __SR ", %0\n\t"
94			     "or	%0, %1, %0\n\t"
95			     "putcon	%0, " __SR "\n\t"
96			     : "=&r" (__dummy0)
97			     : "r" (__dummy1));
98}
99
100#define local_save_flags(x) 						\
101(__extension__ ({	unsigned long long __dummy=SR_MASK_LL;		\
102	__asm__ __volatile__(						\
103		"getcon	" __SR ", %0\n\t"				\
104		"and	%0, %1, %0"					\
105		: "=&r" (x)						\
106		: "r" (__dummy));}))
107
108#define local_irq_save(x)						\
109(__extension__ ({	unsigned long long __d2=SR_MASK_LL, __d1;	\
110	__asm__ __volatile__(          	         			\
111		"getcon	" __SR ", %1\n\t" 				\
112		"or	%1, r63, %0\n\t"				\
113		"or	%1, %2, %1\n\t"					\
114		"putcon	%1, " __SR "\n\t"    				\
115		"and	%0, %2, %0"    					\
116		: "=&r" (x), "=&r" (__d1)				\
117		: "r" (__d2));}));
118
119#define local_irq_restore(x) do { 					\
120	if ( ((x) & SR_MASK_L) == 0 )		/* dropping to 0 ? */	\
121		local_irq_enable();		/* yes...re-enable */	\
122} while (0)
123
124#define irqs_disabled()			\
125({					\
126	unsigned long flags;		\
127	local_save_flags(flags);	\
128	(flags != 0);			\
129})
130
131static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
132{
133	unsigned long flags, retval;
134
135	local_irq_save(flags);
136	retval = *m;
137	*m = val;
138	local_irq_restore(flags);
139	return retval;
140}
141
142static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
143{
144	unsigned long flags, retval;
145
146	local_irq_save(flags);
147	retval = *m;
148	*m = val & 0xff;
149	local_irq_restore(flags);
150	return retval;
151}
152
153static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
154{
155	switch (size) {
156	case 4:
157		return xchg_u32(ptr, x);
158		break;
159	case 1:
160		return xchg_u8(ptr, x);
161		break;
162	}
163	__xchg_called_with_bad_pointer();
164	return x;
165}
166
167#define HAVE_DISABLE_HLT
168void disable_hlt(void);
169void enable_hlt(void);
170
171
172#define smp_mb()        barrier()
173#define smp_rmb()       barrier()
174#define smp_wmb()       barrier()
175
176#ifdef CONFIG_SH_ALPHANUMERIC
177/* This is only used for debugging. */
178extern void print_seg(char *file,int line);
179#define PLS() print_seg(__FILE__,__LINE__)
180#else	/* CONFIG_SH_ALPHANUMERIC */
181#define PLS()
182#endif	/* CONFIG_SH_ALPHANUMERIC */
183
184#define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
185
186#define arch_align_stack(x) (x)
187
188#endif /* __ASM_SH64_SYSTEM_H */
189