Changeset de96d3b in mainline for kernel/genarch/src/fb/fb.c

Timestamp:

2024-01-03T16:54:15Z (9 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/genarch/src/fb/fb.c (modified) (1 diff)

kernel/genarch/src/fb/fb.c

@@ -633 +633 @@
 
         instance->addr = (uint8_t *) km_map((uintptr_t) props->addr, fbsize,
-            KM_NATURAL_ALIGNMENT, PAGE_WRITE | PAGE_NOT_CACHEABLE);
+            KM_NATURAL_ALIGNMENT, PAGE_WRITE | PAGE_WRITE_COMBINE);
         if (!instance->addr) {
                 LOG("Unable to map framebuffer.");