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