Changes in kernel/arch/arm32/src/mm/page.c [a538808:7e752b2] in mainline

File:

• kernel/arch/arm32/src/mm/page.c (modified) (4 diffs)

kernel/arch/arm32/src/mm/page.c

@@ -37 +37 @@
 #include <genarch/mm/page_pt.h>
 #include <mm/page.h>
-#include <arch/mm/frame.h>
 #include <align.h>
 #include <config.h>
@@ -43 +42 @@
 #include <typedefs.h>
 #include <interrupt.h>
-#include <macros.h>
+#include <arch/mm/frame.h>
 
 /** Initializes page tables.
@@ -58 +57 @@
         
         uintptr_t cur;
-
         /* Kernel identity mapping */
-        for (cur = PHYSMEM_START_ADDR;
-            cur < min(config.identity_size, config.physmem_end);
-            cur += FRAME_SIZE)
+        for (cur = PHYSMEM_START_ADDR; cur < last_frame; cur += FRAME_SIZE)
                 page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
         
+        /* Create mapping for exception table at high offset */
 #ifdef HIGH_EXCEPTION_VECTORS
-        /* Create mapping for exception table at high offset */
-        uintptr_t ev_frame = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_NONE);
-        page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, ev_frame, flags);
+        void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
+        page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
 #else
 #error "Only high exception vector supported now"
 #endif
+        cur = ALIGN_DOWN(0x50008010, FRAME_SIZE);
+        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
 
         page_table_unlock(AS_KERNEL, true);
@@ -80 +78 @@
 }
 
+/** Maps device into the kernel space.
+ *
+ * Maps physical address of device into kernel virtual address space (so it can
+ * be accessed only by kernel through virtual address).
+ *
+ * @param physaddr Physical address where device is connected.
+ * @param size Length of area where device is present.
+ *
+ * @return Virtual address where device will be accessible.
+ */
+uintptr_t hw_map(uintptr_t physaddr, size_t size)
+{
+        if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
+            KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
+                panic("Unable to map physical memory %p (%d bytes).",
+                    (void *) physaddr, size);
+        }
+        
+        uintptr_t virtaddr = PA2KA(last_frame);
+        pfn_t i;
+
+        page_table_lock(AS_KERNEL, true);
+        for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
+                page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),
+                    physaddr + PFN2ADDR(i),
+                    PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
+        }
+        page_table_unlock(AS_KERNEL, true);
+        
+        last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
+        return virtaddr;
+}
+
 /** @}
  */