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#ifndef __ALPHA_SYSTEM_H

#define __ALPHA_SYSTEM_H

#include <asm/pal.h>    /* for backwards compatibility... */

/*

 * System defines.. Note that this is included both from .c and .S

 * files, so it does only defines, not any C code.

 */

/*

 * We leave one page for the initial stack page, and one page for

 * the initial process structure. Also, the console eats 3 MB for

 * the initial bootloader (one of which we can reclaim later).

 * With a few other pages for various reasons, we'll use an initial

 * load address of 0xfffffc0000310000UL

 */

#define BOOT_PCB        0x20000000

#define BOOT_ADDR       0x20000000

/* Remove when official MILO sources have ELF support: */

#define BOOT_SIZE       (16*1024)

#define KERNEL_START    0xfffffc0000300000

#define SWAPPER_PGD     0xfffffc0000300000

#define INIT_STACK      0xfffffc0000302000

#define EMPTY_PGT       0xfffffc0000304000

#define EMPTY_PGE       0xfffffc0000308000

#define ZERO_PGE        0xfffffc000030A000

#define START_ADDR      0xfffffc0000310000

/* Remove when official MILO sources have ELF support: */

#define START_SIZE      (2*1024*1024)

#ifndef __ASSEMBLY__

/*

 * This is the logout header that should be common to all platforms

 * (assuming they are running OSF/1 PALcode, I guess).

 */

struct el_common {

        unsigned int    size;           /* size in bytes of logout area */

        int             sbz1    : 31;   /* should be zero */

        char            retry   :  1;   /* retry flag */

        unsigned int    proc_offset;    /* processor-specific offset */

        unsigned int    sys_offset;     /* system-specific offset */

        unsigned long   code;           /* machine check code */

};

extern void wrent(void *, unsigned long);

extern void wrkgp(unsigned long);

extern void wrusp(unsigned long);

extern unsigned long rdusp(void);

extern unsigned long rdmces (void);

extern void wrmces (unsigned long);

extern unsigned long whami(void);

extern void wripir(unsigned long);

#define halt() __asm__ __volatile__ ("call_pal %0" : : "i" (PAL_halt) : "memory")

#define switch_to(prev,next) do { \

        current_set[0] = next; \

        alpha_switch_to((unsigned long) &(next)->tss - 0xfffffc0000000000); \

} while (0)

extern void alpha_switch_to(unsigned long pctxp);

extern void imb(void);

#define mb() \

__asm__ __volatile__("mb": : :"memory")

#define draina() \

__asm__ __volatile__ ("call_pal %0" : : "i" (PAL_draina) : "memory")

#define getipl() \

({ unsigned long __old_ipl; \

__asm__ __volatile__( \

        "call_pal 54\n\t" \

        "bis $0,$0,%0" \

        : "=r" (__old_ipl) \

        : : "$0", "$1", "$16", "$22", "$23", "$24", "$25"); \

__old_ipl; })

#define setipl(__new_ipl) \

__asm__ __volatile__( \

        "bis %0,%0,$16\n\t" \

        "call_pal 53" \

        : : "r" (__new_ipl) \

        : "$0", "$1", "$16", "$22", "$23", "$24", "$25", "memory")

#define swpipl(__new_ipl) \

({ unsigned long __old_ipl; \

__asm__ __volatile__( \

        "bis %1,%1,$16\n\t" \

        "call_pal 53\n\t" \

        "bis $0,$0,%0" \

        : "=r" (__old_ipl) \

        : "r" (__new_ipl) \

        : "$0", "$1", "$16", "$22", "$23", "$24", "$25", "memory"); \

__old_ipl; })

#define cli()                   setipl(7)

#define sti()                   setipl(0)

#define save_flags(flags)       do { flags = getipl(); } while (0)

#define restore_flags(flags)    setipl(flags)

/*

 * TB routines..

 */

extern void tbi(long type, ...);

#define tbisi(x)        tbi(1,(x))

#define tbisd(x)        tbi(2,(x))

#define tbis(x)         tbi(3,(x))

#define tbiap()         tbi(-1)

#define tbia()          tbi(-2)

/*

 * Give prototypes to shut up gcc.

 */

extern __inline__ unsigned long xchg_u32 (volatile int * m, unsigned long val);

extern __inline__ unsigned long xchg_u64 (volatile long * m, unsigned long val);

extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)

{

        unsigned long dummy;

        __asm__ __volatile__(

                "\n1:\t"

                "ldl_l %0,%2\n\t"

                "bis %3,%3,%1\n\t"

                "stl_c %1,%2\n\t"

                "beq %1,1b\n"

                : "=&r" (val), "=&r" (dummy), "=m" (*m)

                : "r" (val), "m" (*m));

        return val;

}

extern __inline__ unsigned long xchg_u64(volatile long * m, unsigned long val)

{

        unsigned long dummy;

        __asm__ __volatile__(

                "\n1:\t"

                "ldq_l %0,%2\n\t"

                "bis %3,%3,%1\n\t"

                "stq_c %1,%2\n\t"

                "beq %1,1b\n"

                : "=&r" (val), "=&r" (dummy), "=m" (*m)

                : "r" (val), "m" (*m));

        return val;

}

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

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

/*

 * This function doesn't exist, so you'll get a linker error

 * if something tries to do an invalid xchg().

 *

 * This only works if the compiler isn't horribly bad at optimizing.

 * gcc-2.5.8 reportedly can't handle this, but as that doesn't work

 * too well on the alpha anyway..

 */

extern void __xchg_called_with_bad_pointer(void);

static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)

{

        switch (size) {

                case 4:

                        return xchg_u32(ptr, x);

                case 8:

                        return xchg_u64(ptr, x);

        }

        __xchg_called_with_bad_pointer();

        return x;

}

#endif /* __ASSEMBLY__ */

#endif