WebSVN – HelenOS – Diff – /trunk/kernel/arch/ia32/include/mm/page.h

 /*
  * Copyright (c) 2001-2004 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
+ *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup ia32mm
  * @{
  */
 /** @file
  */
 #ifndef KERN_ia32_PAGE_H_
 #define KERN_ia32_PAGE_H_
 #include <arch/mm/frame.h>
 #define PAGE_WIDTH  FRAME_WIDTH
 #define PAGE_SIZE   FRAME_SIZE
 #define PAGE_COLOR_BITS 0           /* dummy */
 #ifdef KERNEL
 #ifndef __ASM__
 #   define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
 #   define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
 #else
 #   define KA2PA(x) ((x) - 0x80000000)
 #   define PA2KA(x) ((x) + 0x80000000)
 #endif
 /*
  * Implementation of generic 4-level page table interface.
  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  */
+/* Number of entries in each level. */
 #define PTL0_ENTRIES_ARCH   1024
 #define PTL1_ENTRIES_ARCH   0
 #define PTL2_ENTRIES_ARCH   0
 #define PTL3_ENTRIES_ARCH   1024
+/* Page table sizes for each level. */
-#define PTL0_SIZE_ARCH       ONE_FRAME
+#define PTL0_SIZE_ARCH      ONE_FRAME
-#define PTL1_SIZE_ARCH       0
+#define PTL1_SIZE_ARCH      0
-#define PTL2_SIZE_ARCH       0
+#define PTL2_SIZE_ARCH      0
-#define PTL3_SIZE_ARCH       ONE_FRAME
+#define PTL3_SIZE_ARCH      ONE_FRAME
+/* Macros calculating indices for each level. */
 #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)
+/* Get PTE address accessors for each level. */
+#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
-#define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address) << 12))
+    ((pte_t *) ((((pte_t *) (ptl0))[(i)].frame_address) << 12))
-#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
+#define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
+    (ptl1)
-#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
+#define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
+    (ptl2)
+#define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
-#define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((uintptr_t)((((pte_t *)(ptl3))[(i)].frame_address) << 12))
+    ((uintptr_t) ((((pte_t *) (ptl3))[(i)].frame_address) << 12))
+/* Set PTE address accessors for each level. */
+#define SET_PTL0_ADDRESS_ARCH(ptl0) \
+    (write_cr3((uintptr_t) (ptl0)))
-#define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((uintptr_t) (ptl0)))
+#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
-#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12)
+    (((pte_t *) (ptl0))[(i)].frame_address = (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)].frame_address = (a)>>12)
+    (((pte_t *) (ptl3))[(i)].frame_address = (a) >> 12)
+/* Get PTE flags accessors for each level. */
+#define GET_PTL1_FLAGS_ARCH(ptl0, i) \
-#define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
+    get_pt_flags((pte_t *) (ptl0), (index_t) (i))
-#define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
+#define GET_PTL2_FLAGS_ARCH(ptl1, i) \
+    PAGE_PRESENT
-#define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
+#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
+    PAGE_PRESENT
+#define GET_FRAME_FLAGS_ARCH(ptl3, i) \
-#define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
+    get_pt_flags((pte_t *) (ptl3), (index_t) (i))
+/* Set PTE flags accessors for each level. */
+#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))
+    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))
+    set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
+/* Macros for querying the last level entries. */
+#define PTE_VALID_ARCH(p) \
-#define PTE_VALID_ARCH(p)           (*((uint32_t *) (p)) != 0)
+    (*((uint32_t *) (p)) != 0)
-#define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
+#define PTE_PRESENT_ARCH(p) \
+    ((p)->present != 0)
+#define PTE_GET_FRAME_ARCH(p) \
-#define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address << FRAME_WIDTH)
+    ((p)->frame_address << FRAME_WIDTH)
-#define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
+#define PTE_WRITABLE_ARCH(p) \
+    ((p)->writeable != 0)
 #define PTE_EXECUTABLE_ARCH(p)          1
 #ifndef __ASM__
 #include <mm/mm.h>
 #include <arch/interrupt.h>
 /* Page fault error codes. */
-/** When bit on this position is 0, the page fault was caused by a not-present page. */
+/** When bit on this position is 0, the page fault was caused by a not-present
+ * page.
+ */
 #define PFERR_CODE_P        (1 << 0)
 /** When bit on this position is 1, the page fault was caused by a write. */
 #define PFERR_CODE_RW       (1 << 1)
 /** When bit on this position is 1, the page fault was caused in user mode. */
 #define PFERR_CODE_US       (1 << 2)
 /** When bit on this position is 1, a reserved bit was set in page directory. */
 #define PFERR_CODE_RSVD     (1 << 3)
 static inline int get_pt_flags(pte_t *pt, index_t i)
+{
     pte_t *p = &pt[i];
-    return (
-        (!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
+    return ((!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
         (!p->present) << PAGE_PRESENT_SHIFT |
         p->uaccessible << PAGE_USER_SHIFT |
-<<PAGE_READ_SHIFT |
+<< PAGE_READ_SHIFT |
         p->writeable << PAGE_WRITE_SHIFT |
-<<PAGE_EXEC_SHIFT |
+<< PAGE_EXEC_SHIFT |
-        p->global << PAGE_GLOBAL_SHIFT
+        p->global << PAGE_GLOBAL_SHIFT);
-    );
+}
 static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
+{
     pte_t *p = &pt[i];
     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
     p->present = !(flags & PAGE_NOT_PRESENT);
     p->uaccessible = (flags & PAGE_USER) != 0;
     p->writeable = (flags & PAGE_WRITE) != 0;
     p->global = (flags & PAGE_GLOBAL) != 0;
     /*
-     * Ensure that there is at least one bit set even if the present bit is cleared.
+     * Ensure that there is at least one bit set even if the present bit is
+     * cleared.
      */
     p->soft_valid = true;
+}
 extern void page_arch_init(void);
 extern void page_fault(int n, istate_t *istate);
 #endif /* __ASM__ */
 #endif /* KERNEL */
 #endif
 /** @}
  */

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/include/mm/page.h – Rev 2465 → 2467