diff mbox series

[v5,01/10] x86: Add memory type constants

Message ID 704c1437341e70e0cd1d652e7681a2947a5c8969.1671497984.git.demi@invisiblethingslab.com (mailing list archive)
State Superseded
Headers show
Series Make PAT handling less brittle | expand

Commit Message

Demi Marie Obenour Dec. 20, 2022, 1:07 a.m. UTC 
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>
---
Changes since v4:
- Add Jan Beulich’s Acked-by

Changes since v3:
- Name the reserved values X86_MT_RSVD_2 and X86_MT_RSVD_3, to
  match the architectural values of 0x02 and 0x03.

Changes since v2:
- Avoid using _AC where not required.
- Define reserved memory types inline
---
 xen/arch/x86/include/asm/x86-defns.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/xen/arch/x86/include/asm/x86-defns.h b/xen/arch/x86/include/asm/x86-defns.h
index 28628807cb9897cf6fa8e266f71f5f220813984d..42b5f382d438d21ac97b6438e8c810c7b964cf6d 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__ */