Changeset 74df77d in mainline for src/mm/page.c

Timestamp:

2005-06-10T16:18:43Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

87cd61f

Parents:

18e0a6c

Message:

Add map_structure() to automate mapping of memory structures that can span multiple pages and/or cross page boundaries.
Change ACPI map_sdt() to use map_structure().

Small changes in MPS code.
The extra frame allocation for accessing frame 0 is unnecessary as it is possible to access frame 0 from kernel address space.
Zero TSS descriptor in the newly prepared GDT.

File:

• src/mm/page.c (modified) (2 diffs)

src/mm/page.c

@@ -29 +29 @@
 #include <mm/page.h>
 #include <arch/mm/page.h>
+#include <arch/types.h>
+#include <typedefs.h>
 
 void page_init(void)
@@ -35 +37 @@
         map_page_to_frame(0x0, 0x0, PAGE_NOT_PRESENT, 0);
 }
+
+/** Map memory structure
+ *
+ * Identity-map memory structure
+ * considering possible crossings
+ * of page boundaries.
+ *
+ * @param s Address of the structure.
+ * @param size Size of the structure.
+ */
+void map_structure(__address s, size_t size)
+{
+        int i, cnt, length;
+
+        /* TODO: implement portable way of computing page address from address */
+        length = size + (s - (s & 0xfffff000));
+        cnt = length/PAGE_SIZE + (length%PAGE_SIZE>0);
+
+        for (i = 0; i < cnt; i++)
+                map_page_to_frame(s + i*PAGE_SIZE, s + i*PAGE_SIZE, PAGE_NOT_CACHEABLE, 0);
+
+}