Changeset 17af882 in mainline for kernel/arch/amd64/include/arch/mm/page.h

Timestamp:

2014-06-16T11:32:05Z (9 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update

Children:

2cb32f9

Parents:

334bf28

Message:

Switch the amd64 kernel (back) from 'large' to 'kernel' memory model.

• This makes the amd64 kernel 6% smaller and more comfortable to debug.
• Unlike in the original 'kernel' memory model implementation, KA2PA(PA2KA(x)) == x; for x from kernel identity.
• Memory outside of the kernel identity region continues to be available by the standard means.

File:

• kernel/arch/amd64/include/arch/mm/page.h (modified) (1 diff)

kernel/arch/amd64/include/arch/mm/page.h

@@ -44 +44 @@
 #ifndef __ASM__
 
-#define KA2PA(x)  (((uintptr_t) (x)) - UINT64_C(0xffff800000000000))
-#define PA2KA(x)  (((uintptr_t) (x)) + UINT64_C(0xffff800000000000))
+#define KA2PA(x)  (((uintptr_t) (x)) - UINT64_C(0xffffffff80000000))
+#define PA2KA(x)  (((uintptr_t) (x)) + UINT64_C(0xffffffff80000000))
 
 #else /* __ASM__ */
 
-#define KA2PA(x)  ((x) - 0xffff800000000000)
-#define PA2KA(x)  ((x) + 0xffff800000000000)
+#define KA2PA(x)  ((x) - 0xffffffff80000000)
+#define PA2KA(x)  ((x) + 0xffffffff80000000)
 
 #endif /* __ASM__ */