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drm: add DRM_READ/WRITE64 wrappers around readq/writeq.

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The readq/writeq stuff is from Dave Miller, and he
warns users to be careful about using these. Plans are only
r600 to use it so far.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2009-02-26 10:12:10 +10:00
parent 8ced9c7516
commit 87f0da5535
1 changed files with 19 additions and 0 deletions
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19
include/drm/drm_os_linux.h
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@ -6,6 +6,19 @@
#include <linux/interrupt.h> /* For task queue support */
#include <linux/delay.h>
#ifndef readq
static u64 readq(void __iomem *reg)
{
return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
}
static void writeq(u64 val, void __iomem *reg)
{
writel(val & 0xffffffff, reg);
writel(val >> 32, reg + 0x4UL);
}
#endif
/** Current process ID */
#define DRM_CURRENTPID task_pid_nr(current)
#define DRM_SUSER(p) capable(CAP_SYS_ADMIN)
@ -23,6 +36,12 @@
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
/** Read memory barrier */
/** Read a qword from a MMIO region - be careful using these unless you really understand them */
#define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
/** Write a qword into a MMIO region */
#define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
#define DRM_READMEMORYBARRIER() rmb()
/** Write memory barrier */
#define DRM_WRITEMEMORYBARRIER() wmb()