libpayload: Support functions for Geode

The Geode video driver will require a number of support functions,
including udelay(), PCI bus walking and MSRs.  This adds those functions
in preparation for the actual code.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3231 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 58 insertions, 0 deletions

diff --git a/payloads/libpayload/include/arch/msr.h b/payloads/libpayload/include/arch/msr.h
new file mode 100644
index 0000000000..5985ab81d8
--- /dev/null
+++ b/payloads/libpayload/include/arch/msr.h
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _ARCH_MSR_H_
+#define _ARCH_MSR_H_
+
+static inline unsigned long long _rdmsr(unsigned int msr)
+{
+	unsigned long long val;
+	asm volatile("rdmsr" : "=A" (val) : "c" (msr));
+	return val;
+}
+
+static inline void _wrmsr(unsigned int msr, unsigned long long val)
+{
+	asm volatile("wrmsr" : : "c" (msr), "A"(val));
+}
+
+#define rdmsr(_m, _l, _h) \
+	do { \
+		unsigned long long _v = _rdmsr((_m)); \
+		(_l) = (unsigned int) _v; \
+		(_h) = (unsigned int) ((_v >> 32) & 0xFFFFFFFF); \
+	} while(0)
+
+static inline void wrmsr(unsigned int msr, unsigned int lo, unsigned int hi)
+{
+	unsigned long long val = (((unsigned long long) hi) << 32) | lo;
+	_wrmsr(msr, val);
+}
+
+#endif