Changeset de96d3b in mainline for kernel/generic/include/mm/mm.h

Timestamp:

2024-01-03T16:54:15Z (16 months ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master, topic/simplify-dev-export

Children:

00e6288, 25e1490

Parents:

7130754

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2024-01-01 04:12:52)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2024-01-03 16:54:15)

Message:

On x86 CPUs supporting it, use write-combining memory mode for framebuffer

With this, kernel printouts are about three times faster in QEMU.

File:

• kernel/generic/include/mm/mm.h (modified) (2 diffs)

kernel/generic/include/mm/mm.h

@@ -46 +46 @@
 #define PAGE_EXEC_SHIFT                 5
 #define PAGE_GLOBAL_SHIFT               6
+#define PAGE_WRITE_COMBINE_SHIFT  7
 
 #define PAGE_NOT_CACHEABLE              (0 << PAGE_CACHEABLE_SHIFT)
@@ -62 +63 @@
 #define PAGE_GLOBAL                     (1 << PAGE_GLOBAL_SHIFT)
 
+#define PAGE_WRITE_COMBINE  (1 << PAGE_WRITE_COMBINE_SHIFT)
+
 #endif