patch-0005-x86-Add-memory-type-constants.patch

From e614713b2fa8d12f437c59a1ad99f6e25f792d55 Mon Sep 17 00:00:00 2001
Message-Id: <e614713b2fa8d12f437c59a1ad99f6e25f792d55.1671771766.git.demi@invisiblethingslab.com>
In-Reply-To: <cover.1671771766.git.demi@invisiblethingslab.com>
References: <cover.1671771766.git.demi@invisiblethingslab.com>
From: Demi Marie Obenour <demi@invisiblethingslab.com>
Date: Tue, 20 Dec 2022 16:49:16 +0100
Subject: [PATCH 05/10] x86: Add memory type constants
Cc: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

These are not currently used, so there is no functional change.  Future
patches will use these constants.

Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Demi Marie Obenour <demi@invisiblethingslab.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
 xen/include/asm-x86/x86-defns.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/xen/include/asm-x86/x86-defns.h b/xen/include/asm-x86/x86-defns.h
index 28628807cb9897cf6fa8e266f71f5f220813984d..42b5f382d438d21ac97b6438e8c810c7b964cf6d 100644
--- a/xen/include/asm-x86/x86-defns.h
+++ b/xen/include/asm-x86/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__ */
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab