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/** Current process ID */
10#define DRM_CURRENTPID task_pid_nr(current)
11#define DRM_SUSER(p) capable(CAP_SYS_ADMIN)
12#define DRM_UDELAY(d) udelay(d)
13/** Read a byte from a MMIO region */
14#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
15/** Read a word from a MMIO region */
16#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
17/** Read a dword from a MMIO region */
18#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
19/** Write a byte into a MMIO region */
20#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
21/** Write a word into a MMIO region */
22#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
23/** Write a dword into a MMIO region */
24#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
25/** Read memory barrier */
26#define DRM_READMEMORYBARRIER() rmb()
27/** Write memory barrier */
28#define DRM_WRITEMEMORYBARRIER() wmb()
29/** Read/write memory barrier */
30#define DRM_MEMORYBARRIER() mb()
31
32/** IRQ handler arguments and return type and values */
33#define DRM_IRQ_ARGS int irq, void *arg
34
35/** AGP types */
36#if __OS_HAS_AGP
37#define DRM_AGP_MEM struct agp_memory
38#define DRM_AGP_KERN struct agp_kern_info
39#else
40/* define some dummy types for non AGP supporting kernels */
41struct no_agp_kern {
42 unsigned long aper_base;
43 unsigned long aper_size;
44};
45#define DRM_AGP_MEM int
46#define DRM_AGP_KERN struct no_agp_kern
47#endif
48
49#if !(__OS_HAS_MTRR)
50static __inline__ int mtrr_add(unsigned long base, unsigned long size,
51 unsigned int type, char increment)
52{
53 return -ENODEV;
54}
55
56static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
57{
58 return -ENODEV;
59}
60
61#define MTRR_TYPE_WRCOMB 1
62
63#endif
64
65/** Other copying of data to kernel space */
66#define DRM_COPY_FROM_USER(arg1, arg2, arg3) \
67 copy_from_user(arg1, arg2, arg3)
68/** Other copying of data from kernel space */
69#define DRM_COPY_TO_USER(arg1, arg2, arg3) \
70 copy_to_user(arg1, arg2, arg3)
71/* Macros for copyfrom user, but checking readability only once */
72#define DRM_VERIFYAREA_READ( uaddr, size ) \
73 (access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
74#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3) \
75 __copy_from_user(arg1, arg2, arg3)
76#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3) \
77 __copy_to_user(arg1, arg2, arg3)
78#define DRM_GET_USER_UNCHECKED(val, uaddr) \
79 __get_user(val, uaddr)
80
81#define DRM_HZ HZ
82
83#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
84do { \
85 DECLARE_WAITQUEUE(entry, current); \
86 unsigned long end = jiffies + (timeout); \
87 add_wait_queue(&(queue), &entry); \
88 \
89 for (;;) { \
90 __set_current_state(TASK_INTERRUPTIBLE); \
91 if (condition) \
92 break; \
93 if (time_after_eq(jiffies, end)) { \
94 ret = -EBUSY; \
95 break; \
96 } \
97 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
98 if (signal_pending(current)) { \
99 ret = -EINTR; \
100 break; \
101 } \
102 } \
103 __set_current_state(TASK_RUNNING); \
104 remove_wait_queue(&(queue), &entry); \
105} while (0)
106
107#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
108#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )