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Diffstat (limited to 'linux/drmP.h')
-rw-r--r--linux/drmP.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/linux/drmP.h b/linux/drmP.h
index 4f85d07c..128d6dd1 100644
--- a/linux/drmP.h
+++ b/linux/drmP.h
@@ -49,6 +49,7 @@
#include <asm/io.h>
#include <asm/mman.h>
#include <asm/uaccess.h>
+#include <asm/pgtable.h>
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif
@@ -148,6 +149,7 @@ typedef struct wait_queue *wait_queue_head_t;
#ifndef __HAVE_ARCH_CMPXCHG
/* Include this here so that driver can be
used with older kernels. */
+#if defined(__i386__)
static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
unsigned long new, int size)
{
@@ -174,6 +176,33 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
}
return old;
}
+#elif defined(__powerpc__)
+extern void __cmpxchg_called_with_bad_pointer(void);
+static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
+ unsigned long new, int size)
+{
+ unsigned long prev;
+
+ switch (size) {
+ case 4:
+ __asm__ __volatile__(
+ "sync;"
+ "0: lwarx %0,0,%1 ;"
+ " cmpl 0,%0,%3;"
+ " bne 1f;"
+ " stwcx. %2,0,%1;"
+ " bne- 0b;"
+ "1: "
+ "sync;"
+ : "=&r"(prev)
+ : "r"(ptr), "r"(new), "r"(old)
+ : "cr0", "memory");
+ return prev;
+ }
+ __cmpxchg_called_with_bad_pointer();
+ return old;
+}
+#endif
#define cmpxchg(ptr,o,n) \
((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o), \