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authorJiri Slaby <jirislaby@gmail.com>2008-03-22 18:50:22 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:41:29 +0200
commit43cdf5d6e0a75c1069adc8d126b97b792ff53142 (patch)
treef2fed9cf7fc463946e6c268a79c1e1d9754be393 /include/asm-x86
parent7fda20f146d5d217684ffbc37c6b6c5f82c2dffd (diff)
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x86: pgtable, document pde bits
Some of pde bits weren't documented, add the short description to them. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/pgtable.h14
1 files changed, 7 insertions, 7 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 2ce765070464..f1d9f4a03f6f 100644
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -4,13 +4,13 @@
#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
#define FIRST_USER_ADDRESS 0
-#define _PAGE_BIT_PRESENT 0
-#define _PAGE_BIT_RW 1
-#define _PAGE_BIT_USER 2
-#define _PAGE_BIT_PWT 3
-#define _PAGE_BIT_PCD 4
-#define _PAGE_BIT_ACCESSED 5
-#define _PAGE_BIT_DIRTY 6
+#define _PAGE_BIT_PRESENT 0 /* is present */
+#define _PAGE_BIT_RW 1 /* writeable */
+#define _PAGE_BIT_USER 2 /* userspace addressable */
+#define _PAGE_BIT_PWT 3 /* page write through */
+#define _PAGE_BIT_PCD 4 /* page cache disabled */
+#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
+#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
#define _PAGE_BIT_FILE 6
#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
#define _PAGE_BIT_PAT 7 /* on 4KB pages */