Changes in kernel/arch/amd64/include/mm/page.h [a1f60f3:214ec25c] in mainline

File:

• kernel/arch/amd64/include/mm/page.h (modified) (5 diffs)

kernel/arch/amd64/include/mm/page.h

@@ -35 +35 @@
 /** Paging on AMD64
  *
- * The space is divided in positive numbers (uspace) and
- * negative numbers (kernel). The 'negative' space starting
- * with 0xffff800000000000 and ending with 0xffffffffffffffff
- * is identically mapped physical memory.
- *
+ * The space is divided in positive numbers - userspace and
+ * negative numbers - kernel space. The 'negative' space starting
+ * with 0xffff800000000000 and ending with 0xffffffff80000000
+ * (-2GB) is identically mapped physical memory. The area
+ * (0xffffffff80000000 ... 0xffffffffffffffff is again identically
+ * mapped first 2GB.
+ *
+ * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
  */
 
@@ -47 +50 @@
 #include <arch/mm/frame.h>
 
-#define PAGE_WIDTH  FRAME_WIDTH
-#define PAGE_SIZE   FRAME_SIZE
+#define PAGE_WIDTH      FRAME_WIDTH
+#define PAGE_SIZE       FRAME_SIZE
 
 #ifdef KERNEL
 
 #ifndef __ASM__
-
-#define KA2PA(x)  (((uintptr_t) (x)) - 0xffff800000000000)
-#define PA2KA(x)  (((uintptr_t) (x)) + 0xffff800000000000)
-
-#else /* __ASM__ */
-
-#define KA2PA(x)  ((x) - 0xffff800000000000)
-#define PA2KA(x)  ((x) + 0xffff800000000000)
-
-#endif /* __ASM__ */
+#       include <mm/mm.h>
+#       include <typedefs.h>
+#       include <arch/interrupt.h>
+
+static inline uintptr_t ka2pa(uintptr_t x)
+{
+        if (x > 0xffffffff80000000)
+                return x - 0xffffffff80000000;
+        else 
+                return x - 0xffff800000000000;
+}
+
+#       define KA2PA(x)         ka2pa((uintptr_t) x)
+#       define PA2KA_CODE(x)    (((uintptr_t) (x)) + 0xffffffff80000000)
+#       define PA2KA(x)         (((uintptr_t) (x)) + 0xffff800000000000)
+#else
+#       define KA2PA(x)         ((x) - 0xffffffff80000000)
+#       define PA2KA(x)         ((x) + 0xffffffff80000000)
+#endif
 
 /* Number of entries in each level. */
-#define PTL0_ENTRIES_ARCH  512
-#define PTL1_ENTRIES_ARCH  512
-#define PTL2_ENTRIES_ARCH  512
-#define PTL3_ENTRIES_ARCH  512
+#define PTL0_ENTRIES_ARCH       512
+#define PTL1_ENTRIES_ARCH       512
+#define PTL2_ENTRIES_ARCH       512
+#define PTL3_ENTRIES_ARCH       512
 
 /* Page table sizes for each level. */
-#define PTL0_SIZE_ARCH  ONE_FRAME
-#define PTL1_SIZE_ARCH  ONE_FRAME
-#define PTL2_SIZE_ARCH  ONE_FRAME
-#define PTL3_SIZE_ARCH  ONE_FRAME
+#define PTL0_SIZE_ARCH          ONE_FRAME
+#define PTL1_SIZE_ARCH          ONE_FRAME
+#define PTL2_SIZE_ARCH          ONE_FRAME
+#define PTL3_SIZE_ARCH          ONE_FRAME
 
 /* Macros calculating indices into page tables in each level. */
-#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 39) & 0x1ff)
-#define PTL1_INDEX_ARCH(vaddr)  (((vaddr) >> 30) & 0x1ff)
-#define PTL2_INDEX_ARCH(vaddr)  (((vaddr) >> 21) & 0x1ff)
-#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x1ff)
+#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 39) & 0x1ff)
+#define PTL1_INDEX_ARCH(vaddr)  (((vaddr) >> 30) & 0x1ff)
+#define PTL2_INDEX_ARCH(vaddr)  (((vaddr) >> 21) & 0x1ff)
+#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x1ff)
 
 /* Get PTE address accessors for each level. */
@@ -144 +156 @@
 #ifndef __ASM__
 
-#include <mm/mm.h>
-#include <arch/interrupt.h>
-#include <typedefs.h>
-
 /* Page fault error codes. */
 
@@ -153 +161 @@
  * page.
  */
-#define PFERR_CODE_P  (1 << 0)
+#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)
+#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)
+#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)
+#define PFERR_CODE_RSVD         (1 << 3)
 
 /** When bit on this position os 1, the page fault was caused during instruction
  * fecth.
  */
-#define PFERR_CODE_ID  (1 << 4)
+#define PFERR_CODE_ID           (1 << 4)
 
 /** Page Table Entry. */
 typedef struct {
-        unsigned int present : 1;
-        unsigned int writeable : 1;
-        unsigned int uaccessible : 1;
-        unsigned int page_write_through : 1;
-        unsigned int page_cache_disable : 1;
-        unsigned int accessed : 1;
-        unsigned int dirty : 1;
-        unsigned int unused: 1;
-        unsigned int global : 1;
-        unsigned int soft_valid : 1;  /**< Valid content even if present bit is cleared. */
-        unsigned int avl : 2;
-        unsigned int addr_12_31 : 30;
-        unsigned int addr_32_51 : 21;
-        unsigned int no_execute : 1;
+        unsigned present : 1;
+        unsigned writeable : 1;
+        unsigned uaccessible : 1;
+        unsigned page_write_through : 1;
+        unsigned page_cache_disable : 1;
+        unsigned accessed : 1;
+        unsigned dirty : 1;
+        unsigned unused: 1;
+        unsigned global : 1;
+        unsigned soft_valid : 1;                /**< Valid content even if present bit is cleared. */
+        unsigned avl : 2;
+        unsigned addr_12_31 : 30;
+        unsigned addr_32_51 : 21;
+        unsigned no_execute : 1;
 } __attribute__ ((packed)) pte_t;
 
@@ -203 +211 @@
 {
         pte_t *p = &pt[i];
-        
+
         p->addr_12_31 = (a >> 12) & 0xfffff;
         p->addr_32_51 = a >> 32;