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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);
#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
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