| 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 | unsigned long target = get_time_seconds() + seconds; |
| 42 | |
| 43 | while (get_time_seconds() < target) { |
| 44 | yield(); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | static inline size_t strnlen(const char *s, size_t maxlen) |
| 49 | { |
| 50 | size_t len = 0; |
| 51 | |
| 52 | while (len < maxlen && s[len]) { |
| 53 | len++; |
| 54 | } |
| 55 | return len; |
| 56 | } |
| 57 | |
| 58 | #endif |