Changeset dabe6333 in mainline for arch/amd64/src/interrupt.c

Timestamp:

2006-03-16T15:56:40Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

1ee9ced

Parents:

37e7d2b9

Message:

Added null console for buffering output when no real output available.
Added identity mapper for AMD64 that allows whole physical memory to be
accessed before paging is initialized.

File:

• arch/amd64/src/interrupt.c (modified) (1 diff)

arch/amd64/src/interrupt.c

@@ -103 +103 @@
 }
 
+
+/* Definitions for identic page mapper */
+pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
+pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
+pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
+extern pte_t ptl_0; /* From boot.S */
+
+#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
+#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
+#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
+
+#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
+#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
+#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
+
+#define SETUP_PTL1(ptl0, page, tgt)  {  \
+        SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
+        SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
+    }
+#define SETUP_PTL2(ptl1, page, tgt)  {  \
+        SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
+        SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
+    }
+#define SETUP_PTL3(ptl2, page, tgt)  {  \
+        SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
+        SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
+    }
+#define SETUP_FRAME(ptl3, page, tgt)  { \
+        SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
+        SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
+    }
+
+/** Identic page mapper
+ *
+ * We need to map whole physical memory identically before the page subsystem
+ * is initializaed. This thing clears page table and fills in the specific
+ * items.
+ */
+void ident_page_fault(int n, istate_t *istate)
+{
+        __address page;
+        static __address oldpage = 0;
+        pte_t *aptl_1, *aptl_2, *aptl_3;
+
+        page = read_cr2();
+        if (oldpage) {
+                /* Unmap old address */
+                aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
+                aptl_2 = PTL2_ADDR(aptl_1, oldpage);
+                aptl_3 = PTL3_ADDR(aptl_2, oldpage);
+
+                SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
+                if (aptl_3 == helper_ptl3)
+                        SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
+                if (aptl_2 == helper_ptl2)
+                        SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
+                if (aptl_1 == helper_ptl1)
+                        SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
+        }
+        if (PTL1_PRESENT(&ptl_0, page))
+                aptl_1 = PTL1_ADDR(&ptl_0, page);
+        else {
+                SETUP_PTL1(&ptl_0, page, helper_ptl1);
+                aptl_1 = helper_ptl1;
+        }
+            
+        if (PTL2_PRESENT(aptl_1, page)) 
+                aptl_2 = PTL2_ADDR(aptl_1, page);
+        else {
+                SETUP_PTL2(aptl_1, page, helper_ptl2);
+                aptl_2 = helper_ptl2;
+        }
+
+        if (PTL3_PRESENT(aptl_2, page))
+                aptl_3 = PTL3_ADDR(aptl_2, page);
+        else {
+                SETUP_PTL3(aptl_2, page, helper_ptl3);
+                aptl_3 = helper_ptl3;
+        }
+        
+        SETUP_FRAME(aptl_3, page, page);
+
+        oldpage = page;
+}
+
 void page_fault(int n, istate_t *istate)
 {