LXR qemu/pc-bios/s390-ccw/helper.h

   1/*
   2 * Helper Functions
   3 *
   4 * Copyright (c) 2019 IBM Corp.
   5 *
   6 * Author(s): Jason J. Herne <jjherne@us.ibm.com>
   7 *
   8 * This work is licensed under the terms of the GNU GPL, version 2 or (at
   9 * your option) any later version. See the COPYING file in the top-level
  10 * directory.
  11 */
  12
  13#ifndef S390_CCW_HELPER_H
  14#define S390_CCW_HELPER_H
  15
  16#include "s390-ccw.h"
  17#include "s390-time.h"
  18
  19/* Avoids compiler warnings when casting a pointer to a u32 */
  20static inline uint32_t ptr2u32(void *ptr)
  21{
  22    IPL_assert((uint64_t)ptr <= 0xffffffffull, "ptr2u32: ptr too large");
  23    return (uint32_t)(uint64_t)ptr;
  24}
  25
  26/* Avoids compiler warnings when casting a u32 to a pointer */
  27static inline void *u32toptr(uint32_t n)
  28{
  29    return (void *)(uint64_t)n;
  30}
  31
  32static inline void yield(void)
  33{
  34    asm volatile ("diag %%r0,%%r0,0x44"
  35                  : :
  36                  : "memory", "cc");
  37}
  38
  39static inline void sleep(unsigned int seconds)
  40{
  41    ulong target = get_time_seconds() + seconds;
  42
  43    while (get_time_seconds() < target) {
  44        yield();
  45    }
  46}
  47
  48#endif
  49