Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/**
2 * \file drm_os_linux.h
3 * OS abstraction macros.
4 */
5
6#include <linux/interrupt.h> /* For task queue support */
7#include <linux/delay.h>
8
9#ifndef readq
10static inline u64 readq(void __iomem *reg)
11{
12 return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
13}
14
15static inline void writeq(u64 val, void __iomem *reg)
16{
17 writel(val & 0xffffffff, reg);
18 writel(val >> 32, reg + 0x4UL);
19}
20#endif
21
22/** Current process ID */
23#define DRM_CURRENTPID task_pid_nr(current)
24#define DRM_SUSER(p) capable(CAP_SYS_ADMIN)
25#define DRM_UDELAY(d) udelay(d)
26/** Read a byte from a MMIO region */
27#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
28/** Read a word from a MMIO region */
29#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
30/** Read a dword from a MMIO region */
31#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
32/** Write a byte into a MMIO region */
33#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
34/** Write a word into a MMIO region */
35#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
36/** Write a dword into a MMIO region */
37#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
38/** Read memory barrier */
39
40/** Read a qword from a MMIO region - be careful using these unless you really understand them */
41#define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
42/** Write a qword into a MMIO region */
43#define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
44
45#define DRM_READMEMORYBARRIER() rmb()
46/** Write memory barrier */
47#define DRM_WRITEMEMORYBARRIER() wmb()
48/** Read/write memory barrier */
49#define DRM_MEMORYBARRIER() mb()
50
51/** IRQ handler arguments and return type and values */
52#define DRM_IRQ_ARGS int irq, void *arg
53
54/** AGP types */
55#if __OS_HAS_AGP
56#define DRM_AGP_MEM struct agp_memory
57#define DRM_AGP_KERN struct agp_kern_info
58#else
59/* define some dummy types for non AGP supporting kernels */
60struct no_agp_kern {
61 unsigned long aper_base;
62 unsigned long aper_size;
63};
64#define DRM_AGP_MEM int
65#define DRM_AGP_KERN struct no_agp_kern
66#endif
67
68/** Other copying of data to kernel space */
69#define DRM_COPY_FROM_USER(arg1, arg2, arg3) \
70 copy_from_user(arg1, arg2, arg3)
71/** Other copying of data from kernel space */
72#define DRM_COPY_TO_USER(arg1, arg2, arg3) \
73 copy_to_user(arg1, arg2, arg3)
74
75#define DRM_HZ HZ
76
77#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
78do { \
79 DECLARE_WAITQUEUE(entry, current); \
80 unsigned long end = jiffies + (timeout); \
81 add_wait_queue(&(queue), &entry); \
82 \
83 for (;;) { \
84 __set_current_state(TASK_INTERRUPTIBLE); \
85 if (condition) \
86 break; \
87 if (time_after_eq(jiffies, end)) { \
88 ret = -EBUSY; \
89 break; \
90 } \
91 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
92 if (signal_pending(current)) { \
93 ret = -EINTR; \
94 break; \
95 } \
96 } \
97 __set_current_state(TASK_RUNNING); \
98 remove_wait_queue(&(queue), &entry); \
99} while (0)
100
101#define DRM_WAKEUP( queue ) wake_up( queue )
102#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )