56 lines
2 KiB
C
56 lines
2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/**
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* \file drm_os_linux.h
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* OS abstraction macros.
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*/
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#include <linux/interrupt.h> /* For task queue support */
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#include <linux/sched/signal.h>
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#include <linux/delay.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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/** Current process ID */
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#define DRM_CURRENTPID task_pid_nr(current)
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#define DRM_UDELAY(d) udelay(d)
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/** Read a byte from a MMIO region */
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#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
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/** Read a word from a MMIO region */
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#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
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/** Read a dword from a MMIO region */
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#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
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/** Write a byte into a MMIO region */
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#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
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/** Write a word into a MMIO region */
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#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
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/** Write a dword into a MMIO region */
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#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
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/** Read a qword from a MMIO region - be careful using these unless you really understand them */
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#define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
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/** Write a qword into a MMIO region */
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#define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
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#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
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do { \
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DECLARE_WAITQUEUE(entry, current); \
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unsigned long end = jiffies + (timeout); \
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add_wait_queue(&(queue), &entry); \
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\
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for (;;) { \
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__set_current_state(TASK_INTERRUPTIBLE); \
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if (condition) \
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break; \
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if (time_after_eq(jiffies, end)) { \
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ret = -EBUSY; \
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break; \
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} \
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schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
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if (signal_pending(current)) { \
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ret = -EINTR; \
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break; \
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} \
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} \
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__set_current_state(TASK_RUNNING); \
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remove_wait_queue(&(queue), &entry); \
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} while (0)
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