diff options
Diffstat (limited to 'include/asm-sh/system.h')
| -rw-r--r-- | include/asm-sh/system.h | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/include/asm-sh/system.h b/include/asm-sh/system.h new file mode 100644 index 000000000000..28a3c2d8bcd7 --- /dev/null +++ b/include/asm-sh/system.h @@ -0,0 +1,264 @@ +#ifndef __ASM_SH_SYSTEM_H +#define __ASM_SH_SYSTEM_H + +/* + * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima + * Copyright (C) 2002 Paul Mundt + */ + +#include <linux/config.h> + +/* + * switch_to() should switch tasks to task nr n, first + */ + +#define switch_to(prev, next, last) do { \ + task_t *__last; \ + register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \ + register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \ + register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \ + register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \ + register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \ + register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \ + __asm__ __volatile__ (".balign 4\n\t" \ + "stc.l gbr, @-r15\n\t" \ + "sts.l pr, @-r15\n\t" \ + "mov.l r8, @-r15\n\t" \ + "mov.l r9, @-r15\n\t" \ + "mov.l r10, @-r15\n\t" \ + "mov.l r11, @-r15\n\t" \ + "mov.l r12, @-r15\n\t" \ + "mov.l r13, @-r15\n\t" \ + "mov.l r14, @-r15\n\t" \ + "mov.l r15, @r1 ! save SP\n\t" \ + "mov.l @r6, r15 ! change to new stack\n\t" \ + "mova 1f, %0\n\t" \ + "mov.l %0, @r2 ! save PC\n\t" \ + "mov.l 2f, %0\n\t" \ + "jmp @%0 ! call __switch_to\n\t" \ + " lds r7, pr ! with return to new PC\n\t" \ + ".balign 4\n" \ + "2:\n\t" \ + ".long __switch_to\n" \ + "1:\n\t" \ + "mov.l @r15+, r14\n\t" \ + "mov.l @r15+, r13\n\t" \ + "mov.l @r15+, r12\n\t" \ + "mov.l @r15+, r11\n\t" \ + "mov.l @r15+, r10\n\t" \ + "mov.l @r15+, r9\n\t" \ + "mov.l @r15+, r8\n\t" \ + "lds.l @r15+, pr\n\t" \ + "ldc.l @r15+, gbr\n\t" \ + : "=z" (__last) \ + : "r" (__ts1), "r" (__ts2), "r" (__ts4), \ + "r" (__ts5), "r" (__ts6), "r" (__ts7) \ + : "r3", "t"); \ + last = __last; \ +} while (0) + +#define nop() __asm__ __volatile__ ("nop") + + +#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) + +static __inline__ unsigned long tas(volatile int *m) +{ /* #define tas(ptr) (xchg((ptr),1)) */ + unsigned long retval; + + __asm__ __volatile__ ("tas.b @%1\n\t" + "movt %0" + : "=r" (retval): "r" (m): "t", "memory"); + return retval; +} + +extern void __xchg_called_with_bad_pointer(void); + +#define mb() __asm__ __volatile__ ("": : :"memory") +#define rmb() mb() +#define wmb() __asm__ __volatile__ ("": : :"memory") +#define read_barrier_depends() do { } while(0) + +#ifdef CONFIG_SMP +#define smp_mb() mb() +#define smp_rmb() rmb() +#define smp_wmb() wmb() +#define smp_read_barrier_depends() read_barrier_depends() +#else +#define smp_mb() barrier() +#define smp_rmb() barrier() +#define smp_wmb() barrier() +#define smp_read_barrier_depends() do { } while(0) +#endif + +#define set_mb(var, value) do { xchg(&var, value); } while (0) +#define set_wmb(var, value) do { var = value; wmb(); } while (0) + +/* Interrupt Control */ +static __inline__ void local_irq_enable(void) +{ + unsigned long __dummy0, __dummy1; + + __asm__ __volatile__("stc sr, %0\n\t" + "and %1, %0\n\t" + "stc r6_bank, %1\n\t" + "or %1, %0\n\t" + "ldc %0, sr" + : "=&r" (__dummy0), "=r" (__dummy1) + : "1" (~0x000000f0) + : "memory"); +} + +static __inline__ void local_irq_disable(void) +{ + unsigned long __dummy; + __asm__ __volatile__("stc sr, %0\n\t" + "or #0xf0, %0\n\t" + "ldc %0, sr" + : "=&z" (__dummy) + : /* no inputs */ + : "memory"); +} + +#define local_save_flags(x) \ + __asm__("stc sr, %0; and #0xf0, %0" : "=&z" (x) :/**/: "memory" ) + +#define irqs_disabled() \ +({ \ + unsigned long flags; \ + local_save_flags(flags); \ + (flags != 0); \ +}) + +static __inline__ unsigned long local_irq_save(void) +{ + unsigned long flags, __dummy; + + __asm__ __volatile__("stc sr, %1\n\t" + "mov %1, %0\n\t" + "or #0xf0, %0\n\t" + "ldc %0, sr\n\t" + "mov %1, %0\n\t" + "and #0xf0, %0" + : "=&z" (flags), "=&r" (__dummy) + :/**/ + : "memory" ); + return flags; +} + +#ifdef DEBUG_CLI_STI +static __inline__ void local_irq_restore(unsigned long x) +{ + if ((x & 0x000000f0) != 0x000000f0) + local_irq_enable(); + else { + unsigned long flags; + local_save_flags(flags); + + if (flags == 0) { + extern void dump_stack(void); + printk(KERN_ERR "BUG!\n"); + dump_stack(); + local_irq_disable(); + } + } +} +#else +#define local_irq_restore(x) do { \ + if ((x & 0x000000f0) != 0x000000f0) \ + local_irq_enable(); \ +} while (0) +#endif + +#define really_restore_flags(x) do { \ + if ((x & 0x000000f0) != 0x000000f0) \ + local_irq_enable(); \ + else \ + local_irq_disable(); \ +} while (0) + +/* + * Jump to P2 area. + * When handling TLB or caches, we need to do it from P2 area. + */ +#define jump_to_P2() \ +do { \ + unsigned long __dummy; \ + __asm__ __volatile__( \ + "mov.l 1f, %0\n\t" \ + "or %1, %0\n\t" \ + "jmp @%0\n\t" \ + " nop\n\t" \ + ".balign 4\n" \ + "1: .long 2f\n" \ + "2:" \ + : "=&r" (__dummy) \ + : "r" (0x20000000)); \ +} while (0) + +/* + * Back to P1 area. + */ +#define back_to_P1() \ +do { \ + unsigned long __dummy; \ + __asm__ __volatile__( \ + "nop;nop;nop;nop;nop;nop;nop\n\t" \ + "mov.l 1f, %0\n\t" \ + "jmp @%0\n\t" \ + " nop\n\t" \ + ".balign 4\n" \ + "1: .long 2f\n" \ + "2:" \ + : "=&r" (__dummy)); \ +} while (0) + +/* For spinlocks etc */ +#define local_irq_save(x) x = local_irq_save() + +static __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val) +{ + unsigned long flags, retval; + + local_irq_save(flags); + retval = *m; + *m = val; + local_irq_restore(flags); + return retval; +} + +static __inline__ unsigned long xchg_u8(volatile unsigned char * m, unsigned long val) +{ + unsigned long flags, retval; + + local_irq_save(flags); + retval = *m; + *m = val & 0xff; + local_irq_restore(flags); + return retval; +} + +static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size) +{ + switch (size) { + case 4: + return xchg_u32(ptr, x); + break; + case 1: + return xchg_u8(ptr, x); + break; + } + __xchg_called_with_bad_pointer(); + return x; +} + +/* XXX + * disable hlt during certain critical i/o operations + */ +#define HAVE_DISABLE_HLT +void disable_hlt(void); +void enable_hlt(void); + +#define arch_align_stack(x) (x) + +#endif |