Changeset c520034 in mainline for kernel/arch/arm32/src/mm/page.c

Timestamp:

2011-12-31T18:19:35Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

295f658, 77c2b02, 96cd5b4

Parents:

852052d (diff), 22f0561 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Support for kernel non-identity mappings, phase I.

• identity/non-identity kernel memory split on all architectures
• low/high physical memory split on all architectures
• frame allocator understands low/high memory
• high physical memory currently unused (Phase II)
• more compact frame_t
• zone conf frames, pte_t, kernel stacks allocated from low memory
• lockless TLB-miss handlers everywhere (newly sparc64, ia64)
• preallocate PTL1 page tables for non-identity and prevent their deallocation
• hw_map() unification
• new resource allocator used for allocating kernel virtual addresses

Breakage:

• sparc64/sun4v creates too large kernel identity; not fixed because of lack of testing hw
• ppc32's tlb_refill() seems wrong as it creates too large kernel identity, but appears unused and the architecture works normally

Not implemented yet (phase II):

• allow high memory to be used for common kernel allocations

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>
@@ -42 +43 @@
 #include <typedefs.h>
 #include <interrupt.h>
-#include <arch/mm/frame.h>
+#include <macros.h>
 
 /** Initializes page tables.
@@ -57 +58 @@
         
         uintptr_t cur;
+
         /* Kernel identity mapping */
-        for (cur = PHYSMEM_START_ADDR; cur < last_frame; cur += FRAME_SIZE)
+        for (cur = PHYSMEM_START_ADDR;
+            cur < min(config.identity_size, config.physmem_end);
+            cur += FRAME_SIZE)
                 page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
         
         /* Create mapping for exception table at high offset */
 #ifdef HIGH_EXCEPTION_VECTORS
+        // XXX: fixme to use proper non-identity page
         void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
-        page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
+        page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr),
+            flags);
 #else
 #error "Only high exception vector supported now"
@@ -78 +84 @@
 }
 
-/** 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;
-}
-
 /** @}
  */