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-rw-r--r--bsd-core/drm_atomic.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/bsd-core/drm_atomic.h b/bsd-core/drm_atomic.h
new file mode 100644
index 00000000..26e7d452
--- /dev/null
+++ b/bsd-core/drm_atomic.h
@@ -0,0 +1,141 @@
+/**
+ * \file drm_atomic.h
+ * Atomic operations used in the DRM which may or may not be provided by the OS.
+ *
+ * \author Eric Anholt <anholt@FreeBSD.org>
+ */
+
+/*
+ * Copyright 2004 Eric Anholt
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* Many of these implementations are rather fake, but good enough. */
+
+typedef u_int32_t atomic_t;
+
+#ifdef __FreeBSD__
+#define atomic_set(p, v) (*(p) = (v))
+#define atomic_read(p) (*(p))
+#define atomic_inc(p) atomic_add_int(p, 1)
+#define atomic_dec(p) atomic_subtract_int(p, 1)
+#define atomic_add(n, p) atomic_add_int(p, n)
+#define atomic_sub(n, p) atomic_subtract_int(p, n)
+#else /* __FreeBSD__ */
+/* FIXME */
+#define atomic_set(p, v) (*(p) = (v))
+#define atomic_read(p) (*(p))
+#define atomic_inc(p) (*(p) += 1)
+#define atomic_dec(p) (*(p) -= 1)
+#define atomic_add(n, p) (*(p) += (n))
+#define atomic_sub(n, p) (*(p) -= (n))
+/* FIXME */
+#define atomic_add_int(p, v) *(p) += v
+#define atomic_subtract_int(p, v) *(p) -= v
+#define atomic_set_int(p, bits) *(p) |= (bits)
+#define atomic_clear_int(p, bits) *(p) &= ~(bits)
+#endif /* !__FreeBSD__ */
+
+#if !defined(__FreeBSD_version) || (__FreeBSD_version < 500000)
+#if defined(__i386__)
+/* The extra atomic functions from 5.0 haven't been merged to 4.x */
+static __inline int
+atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
+{
+ int res = exp;
+
+ __asm __volatile (
+ " lock ; "
+ " cmpxchgl %1,%2 ; "
+ " setz %%al ; "
+ " movzbl %%al,%0 ; "
+ "1: "
+ "# atomic_cmpset_int"
+ : "+a" (res) /* 0 (result) */
+ : "r" (src), /* 1 */
+ "m" (*(dst)) /* 2 */
+ : "memory");
+
+ return (res);
+}
+#else /* __i386__ */
+static __inline int
+atomic_cmpset_int(__volatile__ int *dst, int old, int new)
+{
+ int s = splhigh();
+ if (*dst==old) {
+ *dst = new;
+ splx(s);
+ return 1;
+ }
+ splx(s);
+ return 0;
+}
+#endif /* !__i386__ */
+#endif /* !__FreeBSD_version || __FreeBSD_version < 500000 */
+
+static __inline atomic_t
+test_and_set_bit(int b, volatile void *p)
+{
+ int s = splhigh();
+ unsigned int m = 1<<b;
+ unsigned int r = *(volatile int *)p & m;
+ *(volatile int *)p |= m;
+ splx(s);
+ return r;
+}
+
+static __inline void
+clear_bit(int b, volatile void *p)
+{
+ atomic_clear_int(((volatile int *)p) + (b >> 5), 1 << (b & 0x1f));
+}
+
+static __inline void
+set_bit(int b, volatile void *p)
+{
+ atomic_set_int(((volatile int *)p) + (b >> 5), 1 << (b & 0x1f));
+}
+
+static __inline int
+test_bit(int b, volatile void *p)
+{
+ return ((volatile int *)p)[b >> 5] & (1 << (b & 0x1f));
+}
+
+static __inline int
+find_first_zero_bit(volatile void *p, int max)
+{
+ int b;
+ volatile int *ptr = (volatile int *)p;
+
+ for (b = 0; b < max; b += 32) {
+ if (ptr[b >> 5] != ~0) {
+ for (;;) {
+ if ((ptr[b >> 5] & (1 << (b & 0x1f))) == 0)
+ return b;
+ b++;
+ }
+ }
+ }
+ return max;
+}