Changeset 613bc54 in mainline for arch/ppc32/include/mm/page.h

Timestamp:

2006-04-22T20:11:23Z (19 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c118940

Parents:

c7c0b89b

Message:

ppc32: stub for Page Hash Table support

File:

• arch/ppc32/include/mm/page.h (modified) (2 diffs)

arch/ppc32/include/mm/page.h

@@ -45 +45 @@
 #endif
 
-#define PTL0_ENTRIES_ARCH               0
-#define PTL1_ENTRIES_ARCH               0
-#define PTL2_ENTRIES_ARCH               0
-#define PTL3_ENTRIES_ARCH               0
+/*
+ * Implementation of generic 4-level page table interface,
+ * the hardware Page Hash Table is used as cache.
+ *
+ * Page table layout:
+ * - 32-bit virtual addressess
+ * - Offset is 12 bits => pages are 4K long
+ * - PTL0 has 1024 entries (10 bits)
+ * - PTL1 is not used
+ * - PTL2 is not used
+ * - PLT3 has 1024 entries (10 bits)
+ */
 
-#define PTL0_INDEX_ARCH(vaddr)          0
-#define PTL1_INDEX_ARCH(vaddr)          0
-#define PTL2_INDEX_ARCH(vaddr)          0
-#define PTL3_INDEX_ARCH(vaddr)          0
+#define PTL0_ENTRIES_ARCH       1024
+#define PTL1_ENTRIES_ARCH       0
+#define PTL2_ENTRIES_ARCH       0
+#define PTL3_ENTRIES_ARCH       1024
+
+#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
+#define PTL1_INDEX_ARCH(vaddr)  0
+#define PTL2_INDEX_ARCH(vaddr)  0
+#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
 
 #define SET_PTL0_ADDRESS_ARCH(ptl0)
 
-#define GET_PTL1_ADDRESS_ARCH(ptl0, i)          ((pte_t *) 0)
-#define GET_PTL2_ADDRESS_ARCH(ptl1, i)          ((pte_t *) 0)
-#define GET_PTL3_ADDRESS_ARCH(ptl2, i)          ((pte_t *) 0)
-#define GET_FRAME_ADDRESS_ARCH(ptl3, i)         ((pte_t *) 0)
+#define GET_PTL1_ADDRESS_ARCH(ptl0, i)          (((pte_t *) (ptl0))[(i)].pfn << 12)
+#define GET_PTL2_ADDRESS_ARCH(ptl1, i)          (ptl1)
+#define GET_PTL3_ADDRESS_ARCH(ptl2, i)          (ptl2)
+#define GET_FRAME_ADDRESS_ARCH(ptl3, i)         (((pte_t *) (ptl3))[(i)].pfn << 12)
 
-#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
+#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)       (((pte_t *) (ptl0))[(i)].pfn = (a) >> 12)
 #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
 #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
-#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
+#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)      (((pte_t *) (ptl3))[(i)].pfn = (a) >> 12)
 
-#define GET_PTL1_FLAGS_ARCH(ptl0, i)            0
-#define GET_PTL2_FLAGS_ARCH(ptl1, i)            0
-#define GET_PTL3_FLAGS_ARCH(ptl2, i)            0
-#define GET_FRAME_FLAGS_ARCH(ptl3, i)           0
+#define GET_PTL1_FLAGS_ARCH(ptl0, i)            get_pt_flags((pte_t *) (ptl0), (index_t) (i))
+#define GET_PTL2_FLAGS_ARCH(ptl1, i)            PAGE_PRESENT
+#define GET_PTL3_FLAGS_ARCH(ptl2, i)            PAGE_PRESENT
+#define GET_FRAME_FLAGS_ARCH(ptl3, i)           get_pt_flags((pte_t *) (ptl3), (index_t) (i))
 
-#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)
+#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)         set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))
 #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
 #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
-#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)
+#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)        set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
 
-#define PTE_VALID_ARCH(p)               1
-#define PTE_PRESENT_ARCH(p)             1
-#define PTE_GET_FRAME_ARCH(p)           0
+#define PTE_VALID_ARCH(pte)                     (*((__u32 *) (pte)) != 0)
+#define PTE_PRESENT_ARCH(pte)           ((pte)->p != 0)
+#define PTE_GET_FRAME_ARCH(pte)         ((pte)->pfn << 12)
 
 #ifndef __ASM__
@@ -86 +99 @@
 #include <arch/mm/frame.h>
 #include <arch/types.h>
+
+static inline int get_pt_flags(pte_t *pt, index_t i)
+{
+        pte_t *p = &pt[i];
+        
+        return (
+                (1 << PAGE_CACHEABLE_SHIFT) |
+                ((!p->p) << PAGE_PRESENT_SHIFT) |
+                (1 << PAGE_USER_SHIFT) |
+                (1 << PAGE_READ_SHIFT) |
+                (1 << PAGE_WRITE_SHIFT) |
+                (1 << PAGE_EXEC_SHIFT)
+        );
+}
+
+static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
+{
+        pte_t *p = &pt[i];
+        
+        p->p = !(flags & PAGE_NOT_PRESENT);
+        p->valid = 1;
+}
 
 extern void page_arch_init(void);