[xen master] x86: add memory type constants

[patchbot@xxxxxxx]

commit 4714ae256f8cf75af2631eadc6d275e04f4d5d17
Author:     Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Tue Dec 20 16:49:16 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Dec 20 16:49:16 2022 +0100

    x86: add memory type constants
    
    These are not currently used, so there is no functional change.  Future
    patches will use these constants.
    
    Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/include/asm/x86-defns.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/xen/arch/x86/include/asm/x86-defns.h 
b/xen/arch/x86/include/asm/x86-defns.h
index 28628807cb..42b5f382d4 100644
--- a/xen/arch/x86/include/asm/x86-defns.h
+++ b/xen/arch/x86/include/asm/x86-defns.h
@@ -153,4 +153,15 @@
      (1u << X86_EXC_AC) | (1u << X86_EXC_CP) |                      \
      (1u << X86_EXC_VC) | (1u << X86_EXC_SX))
 
+/* Memory types */
+#define X86_MT_UC     0x00 /* uncachable */
+#define X86_MT_WC     0x01 /* write-combined */
+#define X86_MT_RSVD_2 0x02 /* reserved */
+#define X86_MT_RSVD_3 0x03 /* reserved */
+#define X86_MT_WT     0x04 /* write-through */
+#define X86_MT_WP     0x05 /* write-protect */
+#define X86_MT_WB     0x06 /* write-back */
+#define X86_MT_UCM    0x07 /* UC- */
+#define X86_NUM_MT    0x08
+
 #endif /* __XEN_X86_DEFNS_H__ */
--
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