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vcs_hook.c

/*
 * Simulator hook mechanism
 */

#include "vcs_hook.h"
#include <asm/io.h>
#include <stdarg.h>

#define HOOK_TRIG_ADDR      0xb7000000
#define HOOK_MEM_BASE_ADDR  0xce000000

static volatile unsigned *hook_base;

#define HOOK_DATA(offset) hook_base[offset]
#define VHOOK_DATA(offset) hook_base[offset]
#define HOOK_TRIG(funcid) \
      do { \
            *((unsigned *) HOOK_TRIG_ADDR) = funcid; \
      } while (0)
#define HOOK_DATA_BYTE(offset) ((unsigned char *)hook_base)[offset]

static void hook_init(void)
{
      static int first = 1;
      if (first) {
            first = 0;
            hook_base = ioremap(HOOK_MEM_BASE_ADDR, 8192);
      }
}

static unsigned hook_trig(unsigned id)
{
      unsigned ret;

      /* preempt_disable(); */

      /* Dummy read from mem to make sure data has propagated to memory
       * before trigging */
      ret = *hook_base;

      /* trigger hook */
      HOOK_TRIG(id);

      /* wait for call to finish */
      while (VHOOK_DATA(0) > 0) ;

      /* extract return value */

      ret = VHOOK_DATA(1);

      return ret;
}

int hook_call(unsigned id, unsigned pcnt, ...)
{
      va_list ap;
      int i;
      unsigned ret;

      hook_init();

      HOOK_DATA(0) = id;

      va_start(ap, pcnt);
      for (i = 1; i <= pcnt; i++)
            HOOK_DATA(i) = va_arg(ap, unsigned);
      va_end(ap);

      ret = hook_trig(id);

      return ret;
}

int hook_call_str(unsigned id, unsigned size, const char *str)
{
      int i;
      unsigned ret;

      hook_init();

      HOOK_DATA(0) = id;
      HOOK_DATA(1) = size;

      for (i = 0; i < size; i++)
            HOOK_DATA_BYTE(8 + i) = str[i];
      HOOK_DATA_BYTE(8 + i) = 0;

      ret = hook_trig(id);

      return ret;
}

void print_str(const char *str)
{
      int i;
      /* find null at end of string */
      for (i = 1; str[i]; i++) ;
      hook_call(hook_print_str, i, str);
}

void CPU_WATCHDOG_TIMEOUT(unsigned t)
{
}

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