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/** File pointer type */
10#define DRMFILE struct file *
11/** Ioctl arguments */
12#define DRM_IOCTL_ARGS struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data
13#define DRM_ERR(d) -(d)
14/** Current process ID */
15#define DRM_CURRENTPID current->pid
16#define DRM_SUSER(p) capable(CAP_SYS_ADMIN)
17#define DRM_UDELAY(d) udelay(d)
18/** Read a byte from a MMIO region */
19#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
20/** Read a word from a MMIO region */
21#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
22/** Read a dword from a MMIO region */
23#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
24/** Write a byte into a MMIO region */
25#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
26/** Write a word into a MMIO region */
27#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
28/** Write a dword into a MMIO region */
29#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
30/** Read memory barrier */
31#define DRM_READMEMORYBARRIER() rmb()
32/** Write memory barrier */
33#define DRM_WRITEMEMORYBARRIER() wmb()
34/** Read/write memory barrier */
35#define DRM_MEMORYBARRIER() mb()
36/** DRM device local declaration */
37#define DRM_DEVICE drm_file_t *priv = filp->private_data; \
38 drm_device_t *dev = priv->head->dev
39
40/** IRQ handler arguments and return type and values */
41#define DRM_IRQ_ARGS int irq, void *arg, struct pt_regs *regs
42
43/** AGP types */
44#if __OS_HAS_AGP
45#define DRM_AGP_MEM struct agp_memory
46#define DRM_AGP_KERN struct agp_kern_info
47#else
48/* define some dummy types for non AGP supporting kernels */
49struct no_agp_kern {
50 unsigned long aper_base;
51 unsigned long aper_size;
52};
53#define DRM_AGP_MEM int
54#define DRM_AGP_KERN struct no_agp_kern
55#endif
56
57#if !(__OS_HAS_MTRR)
58static __inline__ int mtrr_add(unsigned long base, unsigned long size,
59 unsigned int type, char increment)
60{
61 return -ENODEV;
62}
63
64static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
65{
66 return -ENODEV;
67}
68
69#define MTRR_TYPE_WRCOMB 1
70
71#endif
72
73/** Task queue handler arguments */
74#define DRM_TASKQUEUE_ARGS void *arg
75
76/** For data going into the kernel through the ioctl argument */
77#define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3) \
78 if ( copy_from_user(&arg1, arg2, arg3) ) \
79 return -EFAULT
80/** For data going from the kernel through the ioctl argument */
81#define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3) \
82 if ( copy_to_user(arg1, &arg2, arg3) ) \
83 return -EFAULT
84/** Other copying of data to kernel space */
85#define DRM_COPY_FROM_USER(arg1, arg2, arg3) \
86 copy_from_user(arg1, arg2, arg3)
87/** Other copying of data from kernel space */
88#define DRM_COPY_TO_USER(arg1, arg2, arg3) \
89 copy_to_user(arg1, arg2, arg3)
90/* Macros for copyfrom user, but checking readability only once */
91#define DRM_VERIFYAREA_READ( uaddr, size ) \
92 (access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
93#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3) \
94 __copy_from_user(arg1, arg2, arg3)
95#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3) \
96 __copy_to_user(arg1, arg2, arg3)
97#define DRM_GET_USER_UNCHECKED(val, uaddr) \
98 __get_user(val, uaddr)
99
100#define DRM_GET_PRIV_WITH_RETURN(_priv, _filp) _priv = _filp->private_data
101
102/**
103 * Get the pointer to the SAREA.
104 *
105 * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
106 */
107#define DRM_GETSAREA() \
108do { \
109 drm_map_list_t *entry; \
110 list_for_each_entry( entry, &dev->maplist->head, head ) { \
111 if ( entry->map && \
112 entry->map->type == _DRM_SHM && \
113 (entry->map->flags & _DRM_CONTAINS_LOCK) ) { \
114 dev_priv->sarea = entry->map; \
115 break; \
116 } \
117 } \
118} while (0)
119
120#define DRM_HZ HZ
121
122#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
123do { \
124 DECLARE_WAITQUEUE(entry, current); \
125 unsigned long end = jiffies + (timeout); \
126 add_wait_queue(&(queue), &entry); \
127 \
128 for (;;) { \
129 __set_current_state(TASK_INTERRUPTIBLE); \
130 if (condition) \
131 break; \
132 if (time_after_eq(jiffies, end)) { \
133 ret = -EBUSY; \
134 break; \
135 } \
136 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
137 if (signal_pending(current)) { \
138 ret = -EINTR; \
139 break; \
140 } \
141 } \
142 __set_current_state(TASK_RUNNING); \
143 remove_wait_queue(&(queue), &entry); \
144} while (0)
145
146#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
147#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )