Changeset c520034 in mainline for kernel/arch/ppc32/src/mm/frame.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/ppc32/src/mm/frame.c (modified) (4 diffs)

kernel/arch/ppc32/src/mm/frame.c

@@ -40 +40 @@
 #include <print.h>
 
-uintptr_t last_frame = 0;
 memmap_t memmap;
 
@@ -54 +53 @@
 }
 
-void frame_arch_init(void)
+static void frame_common_arch_init(bool low)
 {
         pfn_t minconf = 2;
@@ -61 +60 @@
         for (i = 0; i < memmap.cnt; i++) {
                 /* To be safe, make the available zone possibly smaller */
-                uintptr_t new_start = ALIGN_UP((uintptr_t) memmap.zones[i].start,
+                uintptr_t base = ALIGN_UP((uintptr_t) memmap.zones[i].start,
                     FRAME_SIZE);
-                size_t new_size = ALIGN_DOWN(memmap.zones[i].size -
-                    (new_start - ((uintptr_t) memmap.zones[i].start)), FRAME_SIZE);
+                size_t size = ALIGN_DOWN(memmap.zones[i].size -
+                    (base - ((uintptr_t) memmap.zones[i].start)), FRAME_SIZE);
                 
-                pfn_t pfn = ADDR2PFN(new_start);
-                size_t count = SIZE2FRAMES(new_size);
-                
+                if (!frame_adjust_zone_bounds(low, &base, &size))
+                        return;
+
+                pfn_t pfn = ADDR2PFN(base);
+                size_t count = SIZE2FRAMES(size);
                 pfn_t conf;
-                if ((minconf < pfn) || (minconf >= pfn + count))
-                        conf = pfn;
-                else
-                        conf = minconf;
-                
-                zone_create(pfn, count, conf, 0);
-                
-                if (last_frame < ALIGN_UP(new_start + new_size, FRAME_SIZE))
-                        last_frame = ALIGN_UP(new_start + new_size, FRAME_SIZE);
+
+                if (low) {
+                        if ((minconf < pfn) || (minconf >= pfn + count))
+                                conf = pfn;
+                        else
+                                conf = minconf;
+                        zone_create(pfn, count, conf,
+                            ZONE_AVAILABLE | ZONE_LOWMEM);
+                } else {
+                        conf = zone_external_conf_alloc(count);
+                        zone_create(pfn, count, conf,
+                            ZONE_AVAILABLE | ZONE_HIGHMEM);
+                }
         }
+        
+}
+
+void frame_low_arch_init(void)
+{
+        frame_common_arch_init(true);
         
         /* First is exception vector, second is 'implementation specific',
@@ -92 +103 @@
 }
 
+void frame_high_arch_init(void)
+{
+        frame_common_arch_init(false);
+}
+
 /** @}
  */