root/include/asm-alpha/processor.h

/* */

INCLUDED FROM

DEFINITIONS

1. start_bh_atomic
2. end_bh_atomic
3. start_thread

   1 /*
   2  * include/asm-alpha/processor.h
   3  *
   4  * Copyright (C) 1994 Linus Torvalds
   5  */
   6 
   7 #ifndef __ASM_ALPHA_PROCESSOR_H
   8 #define __ASM_ALPHA_PROCESSOR_H
   9 
  10 /*
  11  * We have a 41-bit user address space: 2TB user VM...
  12  */
  13 #define TASK_SIZE (0x20000000000UL)
  14 
  15 /*
  16  * Bus types
  17  */
  18 #define EISA_bus 1
  19 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
  20 #define MCA_bus 0
  21 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  22 
  23 /*
  24  * The alpha has no problems with write protection
  25  */
  26 #define wp_works_ok 1
  27 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  28 
  29 struct thread_struct {
  30         unsigned long ksp;
  31         unsigned long usp;
  32         unsigned long ptbr;
  33         unsigned int pcc;
  34         unsigned int asn;
  35         unsigned long unique;
  36         unsigned long flags;
  37         unsigned long res1, res2;
  38 };
  39 
  40 #define INIT_MMAP { &init_task, 0xfffffc0000300000,  0xfffffc0010000000, \
  41         PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC }
  42 
  43 #define INIT_TSS  { \
  44         0, 0, 0, \
  45         0, 0, 0, \
  46         0, 0, 0, \
  47 }
  48 
  49 /*
  50  * These are the "cli()" and "sti()" for software interrupts
  51  * They work by increasing/decreasing the "intr_count" value, 
  52  * and as such can be nested arbitrarily.
  53  */
  54 extern inline void start_bh_atomic(void)
     /*  */
  55 {
  56         unsigned long dummy;
  57         __asm__ __volatile__(
  58                 "\n1:\t"
  59                 "ldq_l %0,%1\n\t"
  60                 "addq %0,1,%0\n\t"
  61                 "stq_c %0,%1\n\t"
  62                 "beq %0,1b\n"
  63                 : "=r" (dummy), "=m" (intr_count)
  64                 : "0" (0));
  65 }
  66 
  67 extern inline void end_bh_atomic(void)
     /*  */
  68 {
  69         unsigned long dummy;
  70         __asm__ __volatile__(
  71                 "\n1:\t"
  72                 "ldq_l %0,%1\n\t"
  73                 "subq %0,1,%0\n\t"
  74                 "stq_c %0,%1\n\t"
  75                 "beq %0,1b\n"
  76                 : "=r" (dummy), "=m" (intr_count)
  77                 : "0" (0));
  78 }
  79 
  80 /*
  81  * Do necessary setup to start up a newly executed thread.
  82  */
  83 static inline void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
     /*  */
  84 {
  85         regs->pc = pc;
  86         wrusp(sp);
  87 }
  88 
  89 #endif /* __ASM_ALPHA_PROCESSOR_H */

/* */