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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#if !(__OS_HAS_MTRR)
69static __inline__ int mtrr_add(unsigned long base, unsigned long size,
70 unsigned int type, char increment)
71{
72 return -ENODEV;
73}
74
75static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
76{
77 return -ENODEV;
78}
79
80#define MTRR_TYPE_WRCOMB 1
81
82#endif
83
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_HZ HZ
101
102#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
103do { \
104 DECLARE_WAITQUEUE(entry, current); \
105 unsigned long end = jiffies + (timeout); \
106 add_wait_queue(&(queue), &entry); \
107 \
108 for (;;) { \
109 __set_current_state(TASK_INTERRUPTIBLE); \
110 if (condition) \
111 break; \
112 if (time_after_eq(jiffies, end)) { \
113 ret = -EBUSY; \
114 break; \
115 } \
116 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
117 if (signal_pending(current)) { \
118 ret = -EINTR; \
119 break; \
120 } \
121 } \
122 __set_current_state(TASK_RUNNING); \
123 remove_wait_queue(&(queue), &entry); \
124} while (0)
125
126#define DRM_WAKEUP( queue ) wake_up( queue )
127#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
1/* SPDX-License-Identifier: GPL-2.0 */
2/**
3 * \file drm_os_linux.h
4 * OS abstraction macros.
5 */
6
7#include <linux/interrupt.h> /* For task queue support */
8#include <linux/sched/signal.h>
9#include <linux/delay.h>
10#include <linux/io-64-nonatomic-lo-hi.h>
11
12/** Current process ID */
13#define DRM_CURRENTPID task_pid_nr(current)
14#define DRM_UDELAY(d) udelay(d)
15/** Read a byte from a MMIO region */
16#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
17/** Read a word from a MMIO region */
18#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
19/** Read a dword from a MMIO region */
20#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
21/** Write a byte into a MMIO region */
22#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
23/** Write a word into a MMIO region */
24#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
25/** Write a dword into a MMIO region */
26#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
27
28/** Read a qword from a MMIO region - be careful using these unless you really understand them */
29#define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
30/** Write a qword into a MMIO region */
31#define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
32
33#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
34do { \
35 DECLARE_WAITQUEUE(entry, current); \
36 unsigned long end = jiffies + (timeout); \
37 add_wait_queue(&(queue), &entry); \
38 \
39 for (;;) { \
40 __set_current_state(TASK_INTERRUPTIBLE); \
41 if (condition) \
42 break; \
43 if (time_after_eq(jiffies, end)) { \
44 ret = -EBUSY; \
45 break; \
46 } \
47 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
48 if (signal_pending(current)) { \
49 ret = -EINTR; \
50 break; \
51 } \
52 } \
53 __set_current_state(TASK_RUNNING); \
54 remove_wait_queue(&(queue), &entry); \
55} while (0)