[PATCH v2 3/6] alpha: describe the PTE read and write enable bits

[Matt Turner <mattst88@gmail.com>]

The comments on _PAGE_KRE and _PAGE_URE said only "xxx". Describe the
four enable bits as the Alpha Linux PTE defines them, in Table 22-3 of
the Alpha Architecture Reference Manual: kernel and user read enable in
bits 8 and 9, kernel and user write enable in bits 12 and 13, with bits
<11:10> and <15:14> reserved. There are only two processor modes, user
and kernel (section 22.5.1). Linux uses the read enables as its accessed
bit and the write enables as its dirty bit, so say which of
__ACCESS_BITS and __DIRTY_BITS each one belongs to.

The names differ from what the hardware calls those bits on the 21264.
Its PALcode loads the PTE unchanged into DTB_PTE (21264/EV67 Hardware
Reference Manual, section 6.9), where bits 9 and 13 are the Executive
read and write enables (Figure 5-27), Executive being mode 1 of the four
the processor implements (Table 5-5). That is a detail below the PALcode
interface, and it is also the layout of the OpenVMS PTE in Table 11-2,
which is not the one Linux uses.

No functional change.

Suggested-by: Magnus Lindholm <linmag7@gmail.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
---
 arch/alpha/include/asm/pgtable.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 8a175e0c2b42..d22e28b956fb 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -65,10 +65,10 @@ struct vm_area_struct;
 #define _PAGE_FOW	0x0004	/* used for page protection (fault on write) */
 #define _PAGE_FOE	0x0008	/* used for page protection (fault on exec) */
 #define _PAGE_ASM	0x0010
-#define _PAGE_KRE	0x0100	/* xxx - see below on the "accessed" bit */
-#define _PAGE_URE	0x0200	/* xxx */
-#define _PAGE_KWE	0x1000	/* used to do the dirty bit in software */
-#define _PAGE_UWE	0x2000	/* used to do the dirty bit in software */
+#define _PAGE_KRE	0x0100	/* kernel read enable, in __ACCESS_BITS */
+#define _PAGE_URE	0x0200	/* user read enable, in __ACCESS_BITS */
+#define _PAGE_KWE	0x1000	/* kernel write enable, in __DIRTY_BITS */
+#define _PAGE_UWE	0x2000	/* user write enable, in __DIRTY_BITS */
 
 /* .. and these are ours ... */
 #define _PAGE_DIRTY	0x20000

-- 
2.55.0