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-rw-r--r--include/asm-ppc/pgtable.h52
1 files changed, 49 insertions, 3 deletions
diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
index 4d4b20c9de78..c41c7958ea1f 100644
--- a/include/asm-ppc/pgtable.h
+++ b/include/asm-ppc/pgtable.h
@@ -202,18 +202,64 @@ extern unsigned long ioremap_bot, ioremap_base;
*
* Note that these bits preclude future use of a page size
* less than 4KB.
+ *
+ *
+ * PPC 440 core has following TLB attribute fields;
+ *
+ * TLB1:
+ * 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+ * RPN................................. - - - - - - ERPN.......
+ *
+ * TLB2:
+ * 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+ * - - - - - - U0 U1 U2 U3 W I M G E - UX UW UR SX SW SR
+ *
+ * There are some constrains and options, to decide mapping software bits
+ * into TLB entry.
+ *
+ * - PRESENT *must* be in the bottom three bits because swap cache
+ * entries use the top 29 bits for TLB2.
+ *
+ * - FILE *must* be in the bottom three bits because swap cache
+ * entries use the top 29 bits for TLB2.
+ *
+ * - CACHE COHERENT bit (M) has no effect on PPC440 core, because it
+ * doesn't support SMP. So we can use this as software bit, like
+ * DIRTY.
+ *
+ * PPC Book-E Linux implementation uses PPC HW PTE bit field definition,
+ * even it doesn't have HW PTE. 0-11th LSB of PTE stand for memory
+ * protection-related function. (See PTE structure in include/asm-ppc/mmu.h)
+ * Definition of _PAGE_XXX in "include/asm-ppc/pagetable.h" stands for
+ * above bits. Note that those bits values are CPU dependent, not
+ * architecture.
+ *
+ * Kernel PTE entry holds arch-dependent swp_entry structure under certain
+ * situation. In other words, in such situation, some portion of PTE bits
+ * are used as swp_entry. In PPC implementation, 3-24th LSB are shared with
+ * swp_entry, however 0-2nd three LSB still hold protection values.
+ * That means three protection bits are reserved for both PTE and SWAP
+ * entry at the most three LSBs.
+ *
+ * There are three protection bits available for SWAP entry;
+ * _PAGE_PRESENT
+ * _PAGE_FILE
+ * _PAGE_HASHPTE (if HW has)
+ *
+ * So those three bits have to be inside of 0-2nd LSB of PTE.
+ *
*/
+
#define _PAGE_PRESENT 0x00000001 /* S: PTE valid */
#define _PAGE_RW 0x00000002 /* S: Write permission */
-#define _PAGE_DIRTY 0x00000004 /* S: Page dirty */
+#define _PAGE_FILE 0x00000004 /* S: nonlinear file mapping */
#define _PAGE_ACCESSED 0x00000008 /* S: Page referenced */
#define _PAGE_HWWRITE 0x00000010 /* H: Dirty & RW */
#define _PAGE_HWEXEC 0x00000020 /* H: Execute permission */
#define _PAGE_USER 0x00000040 /* S: User page */
#define _PAGE_ENDIAN 0x00000080 /* H: E bit */
#define _PAGE_GUARDED 0x00000100 /* H: G bit */
-#define _PAGE_COHERENT 0x00000200 /* H: M bit */
-#define _PAGE_FILE 0x00000400 /* S: nonlinear file mapping */
+#define _PAGE_DIRTY 0x00000200 /* S: Page dirty */
#define _PAGE_NO_CACHE 0x00000400 /* H: I bit */
#define _PAGE_WRITETHRU 0x00000800 /* H: W bit */