arch/cris/arch-v32/mach-a3/vcs_hook.c

   1 /*
   2  * Simulator hook mechanism
   3  */
   4
   5 #include "vcs_hook.h"
   6 #include <asm/io.h>
   7 #include <stdarg.h>
   8
   9 #define HOOK_TRIG_ADDR      0xb7000000
  10 #define HOOK_MEM_BASE_ADDR  0xce000000
  11
  12 static volatile unsigned *hook_base;
  13
  14 #define HOOK_DATA(offset) hook_base[offset]
  15 #define VHOOK_DATA(offset) hook_base[offset]
  16 #define HOOK_TRIG(funcid) \
  17         do { \
  18                 *((unsigned *) HOOK_TRIG_ADDR) = funcid; \
  19         } while (0)
  20 #define HOOK_DATA_BYTE(offset) ((unsigned char *)hook_base)[offset]
  21
  22 static void hook_init(void)
  23 {
  24         static int first = 1;
  25         if (first) {
  26                 first = 0;
  27                 hook_base = ioremap(HOOK_MEM_BASE_ADDR, 8192);
  28         }
  29 }
  30
  31 static unsigned hook_trig(unsigned id)
  32 {
  33         unsigned ret;
  34
  35         /* preempt_disable(); */
  36
  37         /* Dummy read from mem to make sure data has propagated to memory
  38          * before trigging */
  39         ret = *hook_base;
  40
  41         /* trigger hook */
  42         HOOK_TRIG(id);
  43
  44         /* wait for call to finish */
  45         while (VHOOK_DATA(0) > 0) ;
  46
  47         /* extract return value */
  48
  49         ret = VHOOK_DATA(1);
  50
  51         return ret;
  52 }
  53
  54 int hook_call(unsigned id, unsigned pcnt, ...)
  55 {
  56         va_list ap;
  57         int i;
  58         unsigned ret;
  59
  60         hook_init();
  61
  62         HOOK_DATA(0) = id;
  63
  64         va_start(ap, pcnt);
  65         for (i = 1; i <= pcnt; i++)
  66                 HOOK_DATA(i) = va_arg(ap, unsigned);
  67         va_end(ap);
  68
  69         ret = hook_trig(id);
  70
  71         return ret;
  72 }
  73
  74 int hook_call_str(unsigned id, unsigned size, const char *str)
  75 {
  76         int i;
  77         unsigned ret;
  78
  79         hook_init();
  80
  81         HOOK_DATA(0) = id;
  82         HOOK_DATA(1) = size;
  83
  84         for (i = 0; i < size; i++)
  85                 HOOK_DATA_BYTE(8 + i) = str[i];
  86         HOOK_DATA_BYTE(8 + i) = 0;
  87
  88         ret = hook_trig(id);
  89
  90         return ret;
  91 }
  92
  93 void print_str(const char *str)
  94 {
  95         int i;
  96         /* find null at end of string */
  97         for (i = 1; str[i]; i++) ;
  98         hook_call(hook_print_str, i, str);
  99 }
 100
 101 void CPU_WATCHDOG_TIMEOUT(unsigned t)
 102 {
 103 }