PC Welt 2006 November (DVD)/PCWELT_11_2006.ISO/casper/filesystem.squashfs/usr/src/linux-headers-2.6.17-6/include/asm-sh64/system.h

C/C++ Source or Header | 2006-08-11 | 4.7 KB | 195 lines

#ifndef __ASM_SH64_SYSTEM_H
#define __ASM_SH64_SYSTEM_H

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * include/asm-sh64/system.h
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003  Paul Mundt
 * Copyright (C) 2004  Richard Curnow
 *
 */

#include <asm/registers.h>
#include <asm/processor.h>

/*
 *    switch_to() should switch tasks to task nr n, first
 */

typedef struct {
    unsigned long seg;
} mm_segment_t;

extern struct task_struct *sh64_switch_to(struct task_struct *prev,
                      struct thread_struct *prev_thread,
                      struct task_struct *next,
                      struct thread_struct *next_thread);

#define switch_to(prev,next,last) \
    do {\
        if (last_task_used_math != next) {\
            struct pt_regs *regs = next->thread.uregs;\
            if (regs) regs->sr |= SR_FD;\
        }\
        last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
    } while(0)

#define nop() __asm__ __volatile__ ("nop")

#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

#define tas(ptr) (xchg((ptr), 1))

extern void __xchg_called_with_bad_pointer(void);

#define mb()    __asm__ __volatile__ ("synco": : :"memory")
#define rmb()    mb()
#define wmb()    __asm__ __volatile__ ("synco": : :"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 /* CONFIG_SMP */

#define set_rmb(var, value) do { xchg(&var, value); } while (0)
#define set_mb(var, value) set_rmb(var, value)
#define set_wmb(var, value) do { var = value; wmb(); } while (0)

/* Interrupt Control */
#ifndef HARD_CLI
#define SR_MASK_L 0x000000f0L
#define SR_MASK_LL 0x00000000000000f0LL
#else
#define SR_MASK_L 0x10000000L
#define SR_MASK_LL 0x0000000010000000LL
#endif

static __inline__ void local_irq_enable(void)
{
    /* cli/sti based on SR.BL */
    unsigned long long __dummy0, __dummy1=~SR_MASK_LL;

    __asm__ __volatile__("getcon    " __SR ", %0\n\t"
                 "and    %0, %1, %0\n\t"
                 "putcon    %0, " __SR "\n\t"
                 : "=&r" (__dummy0)
                 : "r" (__dummy1));
}

static __inline__ void local_irq_disable(void)
{
    /* cli/sti based on SR.BL */
    unsigned long long __dummy0, __dummy1=SR_MASK_LL;
    __asm__ __volatile__("getcon    " __SR ", %0\n\t"
                 "or    %0, %1, %0\n\t"
                 "putcon    %0, " __SR "\n\t"
                 : "=&r" (__dummy0)
                 : "r" (__dummy1));
}

#define local_save_flags(x)                         \
(__extension__ ({    unsigned long long __dummy=SR_MASK_LL;        \
    __asm__ __volatile__(                        \
        "getcon    " __SR ", %0\n\t"                \
        "and    %0, %1, %0"                    \
        : "=&r" (x)                        \
        : "r" (__dummy));}))

#define local_irq_save(x)                        \
(__extension__ ({    unsigned long long __d2=SR_MASK_LL, __d1;    \
    __asm__ __volatile__(                                   \
        "getcon    " __SR ", %1\n\t"                 \
        "or    %1, r63, %0\n\t"                \
        "or    %1, %2, %1\n\t"                    \
        "putcon    %1, " __SR "\n\t"                    \
        "and    %0, %2, %0"                        \
        : "=&r" (x), "=&r" (__d1)                \
        : "r" (__d2));}));

#define local_irq_restore(x) do {                     \
    if ( ((x) & SR_MASK_L) == 0 )        /* dropping to 0 ? */    \
        local_irq_enable();        /* yes...re-enable */    \
} while (0)

#define irqs_disabled()            \
({                    \
    unsigned long flags;        \
    local_save_flags(flags);    \
    (flags != 0);            \
})

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 smp_mb()        barrier()
#define smp_rmb()       barrier()
#define smp_wmb()       barrier()

#ifdef CONFIG_SH_ALPHANUMERIC
/* This is only used for debugging. */
extern void print_seg(char *file,int line);
#define PLS() print_seg(__FILE__,__LINE__)
#else    /* CONFIG_SH_ALPHANUMERIC */
#define PLS()
#endif    /* CONFIG_SH_ALPHANUMERIC */

#define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)

#define arch_align_stack(x) (x)

#endif /* __ASM_SH64_SYSTEM_H */