1 #ifndef __ASM_CRIS_SYSTEM_H
2 #define __ASM_CRIS_SYSTEM_H
4 #include <linux/config.h>
6 #include <asm/segment.h>
8 /* the switch_to macro calls resume, an asm function in entry.S which does the actual
12 extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
13 #define prepare_to_switch() do { } while(0)
14 #define switch_to(prev,next,last) last = resume(prev,next, \
15 (int)&((struct task_struct *)0)->thread)
17 /* read the CPU version register */
19 extern inline unsigned long rdvr(void) {
21 __asm__ volatile ("move $vr,%0" : "=rm" (vr));
25 /* read/write the user-mode stackpointer */
27 extern inline unsigned long rdusp(void) {
29 __asm__ __volatile__("move $usp,%0" : "=rm" (usp));
34 __asm__ __volatile__("move %0,$usp" : /* no outputs */ : "rm" (usp))
36 /* read the current stackpointer */
38 extern inline unsigned long rdsp(void) {
40 __asm__ __volatile__("move.d $sp,%0" : "=rm" (sp));
44 extern inline unsigned long _get_base(char * addr)
49 #define nop() __asm__ __volatile__ ("nop");
51 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
52 #define tas(ptr) (xchg((ptr),1))
54 struct __xchg_dummy { unsigned long a[100]; };
55 #define __xg(x) ((struct __xchg_dummy *)(x))
58 /* use these and an oscilloscope to see the fraction of time we're running with IRQ's disabled */
59 /* it assumes the LED's are on port 0x90000000 of course. */
60 #define sti() __asm__ __volatile__ ( "ei\n\tpush $r0\n\tmoveq 0,$r0\n\tmove.d $r0,[0x90000000]\n\tpop $r0" );
61 #define cli() __asm__ __volatile__ ( "di\n\tpush $r0\n\tmove.d 0x40000,$r0\n\tmove.d $r0,[0x90000000]\n\tpop $r0");
62 #define save_flags(x) __asm__ __volatile__ ("move $ccr,%0" : "=rm" (x) : : "memory");
63 #define restore_flags(x) __asm__ __volatile__ ("move %0,$ccr\n\tbtstq 5,%0\n\tbpl 1f\n\tnop\n\tpush $r0\n\tmoveq 0,$r0\n\tmove.d $r0,[0x90000000]\n\tpop $r0\n1:\n" : : "r" (x) : "memory");
65 #define __cli() __asm__ __volatile__ ( "di" : : :"memory");
66 #define __sti() __asm__ __volatile__ ( "ei" : : :"memory");
67 #define __save_flags(x) __asm__ __volatile__ ("move $ccr,%0" : "=rm" (x) : : "memory");
68 #define __restore_flags(x) __asm__ __volatile__ ("move %0,$ccr" : : "rm" (x) : "memory");
70 /* For spinlocks etc */
71 #define local_irq_save(x) __asm__ __volatile__ ("move $ccr,%0\n\tdi" : "=rm" (x) : : "memory");
72 #define local_irq_set(x) __asm__ __volatile__ ("move $ccr,%0\n\tei" : "=rm" (x) : : "memory");
73 #define local_irq_restore(x) restore_flags(x)
75 #define local_irq_disable() cli()
76 #define local_irq_enable() sti()
82 #define save_flags(x) __save_flags(x)
83 #define restore_flags(x) __restore_flags(x)
84 #define save_and_cli(x) do { save_flags(x); cli(); } while(0)
85 #define save_and_sti(x) do { save_flags(x); sti(); } while(0)
87 extern inline unsigned long __xchg(unsigned long x, void * ptr, int size)
89 /* since Etrax doesn't have any atomic xchg instructions, we need to disable
90 irq's (if enabled) and do it with move.d's */
93 save_flags(flags); /* save flags, including irq enable bit */
94 cli(); /* shut off irq's */
97 __asm__ __volatile__ (
102 : "m" (*__xg(ptr)), "r" (x)
106 __asm__ __volatile__ (
111 : "m" (*__xg(ptr)), "r" (x)
115 __asm__ __volatile__ (
120 : "m" (*__xg(ptr)), "r" (x)
124 restore_flags(flags); /* restore irq enable bit */
127 unsigned long flags,temp;
128 save_flags(flags); /* save flags, including irq enable bit */
129 cli(); /* shut off irq's */
132 *((unsigned char *)&temp) = x;
133 x = *(unsigned char *)ptr;
134 *(unsigned char *)ptr = *((unsigned char *)&temp);
137 *((unsigned short *)&temp) = x;
138 x = *(unsigned short *)ptr;
139 *(unsigned short *)ptr = *((unsigned short *)&temp);
143 x = *(unsigned long *)ptr;
144 *(unsigned long *)ptr = temp;
147 restore_flags(flags); /* restore irq enable bit */
152 #define mb() __asm__ __volatile__ ("" : : : "memory")
157 #define smp_mb() mb()
158 #define smp_rmb() rmb()
159 #define smp_wmb() wmb()
161 #define smp_mb() barrier()
162 #define smp_rmb() barrier()
163 #define smp_wmb() barrier()
169 * disable hlt during certain critical i/o operations
171 #define HAVE_DISABLE_HLT
172 void disable_hlt(void);
173 void enable_hlt(void);