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/**
* \file drm_os_linux.h
* OS abstraction macros.
*/
#include <linux/interrupt.h> /* For task queue support */
#include <linux/delay.h>
/** Current process ID */
#define DRM_CURRENTPID current->pid
#define DRM_SUSER(p) capable(CAP_SYS_ADMIN)
#define DRM_UDELAY(d) udelay(d)
#if LINUX_VERSION_CODE <= 0x020608 /* KERNEL_VERSION(2,6,8) */
#ifndef __iomem
#define __iomem
#endif
/** Read a byte from a MMIO region */
#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
/** Read a word from a MMIO region */
#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
/** Read a dword from a MMIO region */
#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
/** Write a byte into a MMIO region */
#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a word into a MMIO region */
#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
#else
/** Read a byte from a MMIO region */
#define DRM_READ8(map, offset) readb((map)->handle + (offset))
/** Read a word from a MMIO region */
#define DRM_READ16(map, offset) readw((map)->handle + (offset))
/** Read a dword from a MMIO region */
#define DRM_READ32(map, offset) readl((map)->handle + (offset))
/** Write a byte into a MMIO region */
#define DRM_WRITE8(map, offset, val) writeb(val, (map)->handle + (offset))
/** Write a word into a MMIO region */
#define DRM_WRITE16(map, offset, val) writew(val, (map)->handle + (offset))
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val) writel(val, (map)->handle + (offset))
#endif
/** Read memory barrier */
#define DRM_READMEMORYBARRIER() rmb()
/** Write memory barrier */
#define DRM_WRITEMEMORYBARRIER() wmb()
/** Read/write memory barrier */
#define DRM_MEMORYBARRIER() mb()
/** IRQ handler arguments and return type and values */
#define DRM_IRQ_ARGS int irq, void *arg
/** backwards compatibility with old irq return values */
#ifndef IRQ_HANDLED
typedef void irqreturn_t;
#define IRQ_HANDLED /* nothing */
#define IRQ_NONE /* nothing */
#endif
/** AGP types */
#if __OS_HAS_AGP
#define DRM_AGP_MEM struct agp_memory
#define DRM_AGP_KERN struct agp_kern_info
#else
/* define some dummy types for non AGP supporting kernels */
struct no_agp_kern {
unsigned long aper_base;
unsigned long aper_size;
};
#define DRM_AGP_MEM int
#define DRM_AGP_KERN struct no_agp_kern
#endif
#if !(__OS_HAS_MTRR)
static __inline__ int mtrr_add(unsigned long base, unsigned long size,
unsigned int type, char increment)
{
return -ENODEV;
}
static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
{
return -ENODEV;
}
#define MTRR_TYPE_WRCOMB 1
#endif
/** Other copying of data to kernel space */
#define DRM_COPY_FROM_USER(arg1, arg2, arg3) \
copy_from_user(arg1, arg2, arg3)
/** Other copying of data from kernel space */
#define DRM_COPY_TO_USER(arg1, arg2, arg3) \
copy_to_user(arg1, arg2, arg3)
/* Macros for copyfrom user, but checking readability only once */
#define DRM_VERIFYAREA_READ( uaddr, size ) \
(access_ok( VERIFY_READ, uaddr, size) ? 0 : -EFAULT)
#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3) \
__copy_from_user(arg1, arg2, arg3)
#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3) \
__copy_to_user(arg1, arg2, arg3)
#define DRM_GET_USER_UNCHECKED(val, uaddr) \
__get_user(val, uaddr)
#define DRM_HZ HZ
#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
do { \
DECLARE_WAITQUEUE(entry, current); \
unsigned long end = jiffies + (timeout); \
add_wait_queue(&(queue), &entry); \
\
for (;;) { \
__set_current_state(TASK_INTERRUPTIBLE); \
if (condition) \
break; \
if (time_after_eq(jiffies, end)) { \
ret = -EBUSY; \
break; \
} \
schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
if (signal_pending(current)) { \
ret = -EINTR; \
break; \
} \
} \
__set_current_state(TASK_RUNNING); \
remove_wait_queue(&(queue), &entry); \
} while (0)
#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
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