helper.h (1049B)
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 */ 20 static 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 */ 27 static inline void *u32toptr(uint32_t n) 28 { 29 return (void *)(uint64_t)n; 30 } 31 32 static inline void yield(void) 33 { 34 asm volatile ("diag %%r0,%%r0,0x44" 35 : : 36 : "memory", "cc"); 37 } 38 39 static 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