/* * Helper Functions * * Copyright (c) 2019 IBM Corp. * * Author(s): Jason J. Herne <jjherne@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2 or (at * your option) any later version. See the COPYING file in the top-level * directory. */ #ifndef S390_CCW_HELPER_H #define S390_CCW_HELPER_H #include "s390-ccw.h" #include "s390-time.h" /* Avoids compiler warnings when casting a pointer to a u32 */ static inline uint32_t ptr2u32(void *ptr) { IPL_assert((uint64_t)ptr <= 0xffffffffull, "ptr2u32: ptr too large"); return (uint32_t)(uint64_t)ptr; } /* Avoids compiler warnings when casting a u32 to a pointer */ static inline void *u32toptr(uint32_t n) { return (void *)(uint64_t)n; } static inline void yield(void) { asm volatile ("diag %%r0,%%r0,0x44" : : : "memory", "cc"); } static inline void sleep(unsigned int seconds) { unsigned long target = get_time_seconds() + seconds; while (get_time_seconds() < target) { yield(); } } #endif