Changeset b7068da in mainline for kernel/arch/ia32/src/mm/page.c

Timestamp:

2012-02-09T20:35:12Z (12 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

591762c6

Parents:

7cede12c (diff), 3d4750f (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:

Merge mainline changes

File:

• kernel/arch/ia32/src/mm/page.c (modified) (2 diffs)

kernel/arch/ia32/src/mm/page.c

@@ -49 +49 @@
 #include <print.h>
 #include <interrupt.h>
+#include <macros.h>
 
 void page_arch_init(void)
@@ -55 +56 @@
         int flags;
         
-        if (config.cpu_active == 1) {
-                page_mapping_operations = &pt_mapping_operations;
+        if (config.cpu_active > 1) {
+                /* Fast path for non-boot CPUs */
+                write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
+                paging_on();
+                return;
+        }
+
+        page_mapping_operations = &pt_mapping_operations;
         
-                /*
-                 * PA2KA(identity) mapping for all frames until last_frame.
-                 */
-                page_table_lock(AS_KERNEL, true);
-                for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
-                        flags = PAGE_CACHEABLE | PAGE_WRITE;
-                        if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
-                                flags |= PAGE_GLOBAL;
-                        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
-                }
-                page_table_unlock(AS_KERNEL, true);
+        /*
+         * PA2KA(identity) mapping for all low-memory frames.
+         */
+        page_table_lock(AS_KERNEL, true);
+        for (cur = 0; cur < min(config.identity_size, config.physmem_end);
+            cur += FRAME_SIZE) {
+                flags = PAGE_CACHEABLE | PAGE_WRITE;
+                if ((PA2KA(cur) >= config.base) &&
+                    (PA2KA(cur) < config.base + config.kernel_size))
+                        flags |= PAGE_GLOBAL;
+                page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
+        }
+        page_table_unlock(AS_KERNEL, true);
                 
-                exc_register(14, "page_fault", true, (iroutine_t) page_fault);
-                write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
-        } else
-                write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
+        exc_register(14, "page_fault", true, (iroutine_t) page_fault);
+        write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
         
         paging_on();
-}
-
-
-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 (%zu 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++) {
-                uintptr_t addr = PFN2ADDR(i);
-                page_mapping_insert(AS_KERNEL, virtaddr + addr, physaddr + addr, PAGE_NOT_CACHEABLE | PAGE_WRITE);
-        }
-        page_table_unlock(AS_KERNEL, true);
-        
-        last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
-        
-        return virtaddr;
 }