194 lines
4.7 KiB
C
194 lines
4.7 KiB
C
#ifndef __ASM_SH64_SYSTEM_H
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#define __ASM_SH64_SYSTEM_H
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* include/asm-sh64/system.h
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 Paul Mundt
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* Copyright (C) 2004 Richard Curnow
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*
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*/
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#include <asm/registers.h>
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#include <asm/processor.h>
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/*
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* switch_to() should switch tasks to task nr n, first
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*/
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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extern struct task_struct *sh64_switch_to(struct task_struct *prev,
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struct thread_struct *prev_thread,
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struct task_struct *next,
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struct thread_struct *next_thread);
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#define switch_to(prev,next,last) \
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do {\
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if (last_task_used_math != next) {\
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struct pt_regs *regs = next->thread.uregs;\
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if (regs) regs->sr |= SR_FD;\
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}\
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last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
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} while(0)
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#define nop() __asm__ __volatile__ ("nop")
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#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
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#define tas(ptr) (xchg((ptr), 1))
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extern void __xchg_called_with_bad_pointer(void);
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#define mb() __asm__ __volatile__ ("synco": : :"memory")
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#define rmb() mb()
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#define wmb() __asm__ __volatile__ ("synco": : :"memory")
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#define read_barrier_depends() do { } while (0)
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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#define smp_wmb() wmb()
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#define smp_read_barrier_depends() read_barrier_depends()
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while (0)
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#endif /* CONFIG_SMP */
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#define set_rmb(var, value) do { xchg(&var, value); } while (0)
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#define set_mb(var, value) set_rmb(var, value)
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#define set_wmb(var, value) do { var = value; wmb(); } while (0)
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/* Interrupt Control */
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#ifndef HARD_CLI
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#define SR_MASK_L 0x000000f0L
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#define SR_MASK_LL 0x00000000000000f0LL
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#else
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#define SR_MASK_L 0x10000000L
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#define SR_MASK_LL 0x0000000010000000LL
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#endif
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static __inline__ void local_irq_enable(void)
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{
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/* cli/sti based on SR.BL */
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unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
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__asm__ __volatile__("getcon " __SR ", %0\n\t"
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"and %0, %1, %0\n\t"
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"putcon %0, " __SR "\n\t"
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: "=&r" (__dummy0)
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: "r" (__dummy1));
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}
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static __inline__ void local_irq_disable(void)
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{
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/* cli/sti based on SR.BL */
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unsigned long long __dummy0, __dummy1=SR_MASK_LL;
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__asm__ __volatile__("getcon " __SR ", %0\n\t"
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"or %0, %1, %0\n\t"
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"putcon %0, " __SR "\n\t"
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: "=&r" (__dummy0)
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: "r" (__dummy1));
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}
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#define local_save_flags(x) \
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(__extension__ ({ unsigned long long __dummy=SR_MASK_LL; \
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__asm__ __volatile__( \
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"getcon " __SR ", %0\n\t" \
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"and %0, %1, %0" \
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: "=&r" (x) \
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: "r" (__dummy));}))
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#define local_irq_save(x) \
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(__extension__ ({ unsigned long long __d2=SR_MASK_LL, __d1; \
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__asm__ __volatile__( \
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"getcon " __SR ", %1\n\t" \
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"or %1, r63, %0\n\t" \
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"or %1, %2, %1\n\t" \
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"putcon %1, " __SR "\n\t" \
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"and %0, %2, %0" \
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: "=&r" (x), "=&r" (__d1) \
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: "r" (__d2));}));
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#define local_irq_restore(x) do { \
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if ( ((x) & SR_MASK_L) == 0 ) /* dropping to 0 ? */ \
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local_irq_enable(); /* yes...re-enable */ \
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} while (0)
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#define irqs_disabled() \
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({ \
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unsigned long flags; \
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local_save_flags(flags); \
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(flags != 0); \
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})
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static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
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{
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unsigned long flags, retval;
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local_irq_save(flags);
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retval = *m;
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*m = val;
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local_irq_restore(flags);
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return retval;
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}
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static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
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{
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unsigned long flags, retval;
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local_irq_save(flags);
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retval = *m;
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*m = val & 0xff;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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{
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switch (size) {
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case 4:
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return xchg_u32(ptr, x);
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break;
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case 1:
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return xchg_u8(ptr, x);
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break;
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}
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__xchg_called_with_bad_pointer();
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return x;
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}
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/* XXX
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* disable hlt during certain critical i/o operations
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*/
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#define HAVE_DISABLE_HLT
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void disable_hlt(void);
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void enable_hlt(void);
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#ifdef CONFIG_SH_ALPHANUMERIC
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/* This is only used for debugging. */
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extern void print_seg(char *file,int line);
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#define PLS() print_seg(__FILE__,__LINE__)
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#else /* CONFIG_SH_ALPHANUMERIC */
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#define PLS()
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#endif /* CONFIG_SH_ALPHANUMERIC */
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#define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
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#define arch_align_stack(x) (x)
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#endif /* __ASM_SH64_SYSTEM_H */
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