include/asm-alpha/system.h

/* */
This source file includes following definitions.
xchg_u32
xchg_u64
__xchg
   1 #ifndef __ALPHA_SYSTEM_H
   2 #define __ALPHA_SYSTEM_H
   3 
   4 #include <asm/pal.h>    /* for backwards compatibility... */
   5 
   6 /*
   7  * System defines.. Note that this is included both from .c and .S
   8  * files, so it does only defines, not any C code.
   9  */
  10 
  11 /*
  12  * We leave one page for the initial stack page, and one page for
  13  * the initial process structure. Also, the console eats 3 MB for
  14  * the initial bootloader (one of which we can reclaim later).
  15  * With a few other pages for various reasons, we'll use an initial
  16  * load address of 0xfffffc0000310000UL
  17  */
  18 #define BOOT_PCB        0x20000000
  19 #define BOOT_ADDR       0x20000000
  20 #define BOOT_SIZE       (16*1024)
  21 
  22 #define KERNEL_START    0xfffffc0000300000
  23 #define SWAPPER_PGD     0xfffffc0000300000
  24 #define INIT_STACK      0xfffffc0000302000
  25 #define EMPTY_PGT       0xfffffc0000304000
  26 #define EMPTY_PGE       0xfffffc0000308000
  27 #define ZERO_PGE        0xfffffc000030A000
  28 
  29 #define START_ADDR      0xfffffc0000310000
  30 #define START_SIZE      (2*1024*1024)
  31 
  32 #ifndef __ASSEMBLY__
  33 
  34 /*
  35  * This is the logout header that should be common to all platforms
  36  * (assuming they are running OSF/1 PALcode, I guess).
  37  */
  38 struct el_common {
  39         unsigned int    size;           /* size in bytes of logout area */
  40         int             sbz1    : 31;   /* should be zero */
  41         char            retry   :  1;   /* retry flag */
  42         unsigned int    proc_offset;    /* processor-specific offset */
  43         unsigned int    sys_offset;     /* system-specific offset */
  44 };
  45 
  46 extern void wrent(void *, unsigned long);
  47 extern void wrkgp(unsigned long);
  48 extern void wrusp(unsigned long);
  49 extern unsigned long rdusp(void);
  50 extern unsigned long rdmces (void);
  51 extern void wrmces (unsigned long);
  52 
  53 #define halt() __asm__ __volatile__ ("call_pal %0" : : "i" (PAL_halt) : "memory")
  54 
  55 #define switch_to(prev,next) do { \
  56         current_set[0] = next; \
  57         alpha_switch_to((unsigned long) &(next)->tss - 0xfffffc0000000000); \
  58 } while (0)
  59 
  60 extern void alpha_switch_to(unsigned long pctxp);
  61 
  62 extern void imb(void);
  63 
  64 #define mb() \
  65 __asm__ __volatile__("mb": : :"memory")
  66 
  67 #define draina() \
  68 __asm__ __volatile__ ("call_pal %0" : : "i" (PAL_draina) : "memory")
  69 
  70 #define getipl() \
  71 ({ unsigned long __old_ipl; \
  72 __asm__ __volatile__( \
  73         "call_pal 54\n\t" \
  74         "bis $0,$0,%0" \
  75         : "=r" (__old_ipl) \
  76         : : "$0", "$1", "$16", "$22", "$23", "$24", "$25"); \
  77 __old_ipl; })
  78 
  79 #define setipl(__new_ipl) \
  80 __asm__ __volatile__( \
  81         "bis %0,%0,$16\n\t" \
  82         "call_pal 53" \
  83         : : "r" (__new_ipl) \
  84         : "$0", "$1", "$16", "$22", "$23", "$24", "$25", "memory")
  85 
  86 #define swpipl(__new_ipl) \
  87 ({ unsigned long __old_ipl; \
  88 __asm__ __volatile__( \
  89         "bis %1,%1,$16\n\t" \
  90         "call_pal 53\n\t" \
  91         "bis $0,$0,%0" \
  92         : "=r" (__old_ipl) \
  93         : "r" (__new_ipl) \
  94         : "$0", "$1", "$16", "$22", "$23", "$24", "$25", "memory"); \
  95 __old_ipl; })
  96 
  97 #define cli()                   setipl(7)
  98 #define sti()                   setipl(0)
  99 #define save_flags(flags)       do { flags = getipl(); } while (0)
 100 #define restore_flags(flags)    setipl(flags)
 101 
 102 /*
 103  * TB routines..
 104  */
 105 extern void tbi(long type, ...);
 106 
 107 #define tbisi(x)        tbi(1,(x))
 108 #define tbisd(x)        tbi(2,(x))
 109 #define tbis(x)         tbi(3,(x))
 110 #define tbiap()         tbi(-1)
 111 #define tbia()          tbi(-2)
 112 
 113 /*
 114  * Give prototypes to shut up gcc.
 115  */
 116 extern __inline__ unsigned long xchg_u32 (volatile int * m, unsigned long val);
 117 extern __inline__ unsigned long xchg_u64 (volatile long * m, unsigned long val);
 118 
 119 extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
     /*  */
 120 {
 121         unsigned long dummy, dummy2;
 122 
 123         __asm__ __volatile__(
 124                 "\n1:\t"
 125                 "ldl_l %0,0(%1)\n\t"
 126                 "bis %2,%2,%3\n\t"
 127                 "stl_c %3,0(%1)\n\t"
 128                 "beq %3,1b\n"
 129                 : "=r" (val), "=r" (m), "=r" (dummy), "=r" (dummy2)
 130                 : "1" (m), "2" (val)
 131                 : "memory");
 132         return val;
 133 }
 134 
 135 extern __inline__ unsigned long xchg_u64(volatile long * m, unsigned long val)
     /*  */
 136 {
 137         unsigned long dummy, dummy2;
 138 
 139         __asm__ __volatile__(
 140                 "\n1:\t"
 141                 "ldq_l %0,0(%1)\n\t"
 142                 "bis %2,%2,%3\n\t"
 143                 "stq_c %3,0(%1)\n\t"
 144                 "beq %3,1b\n"
 145                 : "=r" (val), "=r" (m), "=r" (dummy), "=r" (dummy2)
 146                 : "1" (m), "2" (val)
 147                 : "memory");
 148         return val;
 149 }
 150 
 151 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
 152 #define tas(ptr) (xchg((ptr),1))
 153 
 154 /*
 155  * This function doesn't exist, so you'll get a linker error
 156  * if something tries to do an invalid xchg().
 157  *
 158  * This only works if the compiler isn't horribly bad at optimizing.
 159  * gcc-2.5.8 reportedly can't handle this, but as that doesn't work
 160  * too well on the alpha anyway..
 161  */
 162 extern void __xchg_called_with_bad_pointer(void);
 163 
 164 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
     /*  */
 165 {
 166         switch (size) {
 167                 case 4:
 168                         return xchg_u32(ptr, x);
 169                 case 8:
 170                         return xchg_u64(ptr, x);
 171         }
 172         __xchg_called_with_bad_pointer();
 173         return x;
 174 }
 175 
 176 #endif /* __ASSEMBLY__ */
 177 
 178 #endif
/* */
root/include/asm-alpha/system.h

INCLUDED FROM

DEFINITIONS
