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 ) 128