Add HPET support to Xen. It is quicker to access and more

precise than the PIT.
Signed-off-by: Keir Fraser <keir@xensource.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/xen/include/asm-x86/hpet.h b/xen/include/asm-x86/hpet.h
new file mode 100644
index 0000000000..f3c27cb6a6
--- /dev/null
+++ b/xen/include/asm-x86/hpet.h
@@ -0,0 +1,52 @@
+#ifndef __X86_HPET_H__
+#define __X86_HPET_H__
+
+/*
+ * Documentation on HPET can be found at:
+ *      http://www.intel.com/ial/home/sp/pcmmspec.htm
+ *      ftp://download.intel.com/ial/home/sp/mmts098.pdf
+ */
+
+#define HPET_MMAP_SIZE	1024
+
+#define HPET_ID		0x000
+#define HPET_PERIOD	0x004
+#define HPET_CFG	0x010
+#define HPET_STATUS	0x020
+#define HPET_COUNTER	0x0f0
+#define HPET_T0_CFG	0x100
+#define HPET_T0_CMP	0x108
+#define HPET_T0_ROUTE	0x110
+#define HPET_T1_CFG	0x120
+#define HPET_T1_CMP	0x128
+#define HPET_T1_ROUTE	0x130
+#define HPET_T2_CFG	0x140
+#define HPET_T2_CMP	0x148
+#define HPET_T2_ROUTE	0x150
+
+#define HPET_ID_VENDOR	0xffff0000
+#define HPET_ID_LEGSUP	0x00008000
+#define HPET_ID_NUMBER	0x00001f00
+#define HPET_ID_REV	0x000000ff
+#define	HPET_ID_NUMBER_SHIFT	8
+
+#define HPET_ID_VENDOR_SHIFT	16
+#define HPET_ID_VENDOR_8086	0x8086
+
+#define HPET_CFG_ENABLE	0x001
+#define HPET_CFG_LEGACY	0x002
+#define	HPET_LEGACY_8254	2
+#define	HPET_LEGACY_RTC		8
+
+#define HPET_TN_ENABLE		0x004
+#define HPET_TN_PERIODIC	0x008
+#define HPET_TN_PERIODIC_CAP	0x010
+#define HPET_TN_SETVAL		0x040
+#define HPET_TN_32BIT		0x100
+
+#define hpet_read32(x)    \
+    (*(volatile u32 *)(fix_to_virt(FIX_HPET_BASE) + (x)))
+#define hpet_write32(y,x) \
+    (*(volatile u32 *)(fix_to_virt(FIX_HPET_BASE) + (x)) = (y))
+
+#endif /* __X86_HPET_H__ */