Changes in kernel/arch/amd64/src/mm/page.c [7e752b2:40c8c17] in mainline

File:

• kernel/arch/amd64/src/mm/page.c (modified) (2 diffs)

kernel/arch/amd64/src/mm/page.c

@@ -46 +46 @@
 #include <panic.h>
 #include <align.h>
+#include <macros.h>
 
 void page_arch_init(void)
 {
-        if (config.cpu_active == 1) {
-                uintptr_t cur;
-                unsigned int identity_flags =
-                    PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL | PAGE_WRITE;
+        if (config.cpu_active > 1) {
+                write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
+                return;
+        }
+
+        uintptr_t cur;
+        unsigned int identity_flags =
+            PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL | PAGE_WRITE;
                 
-                page_mapping_operations = &pt_mapping_operations;
+        page_mapping_operations = &pt_mapping_operations;
                 
-                page_table_lock(AS_KERNEL, true);
+        page_table_lock(AS_KERNEL, true);
                 
-                /*
-                 * PA2KA(identity) mapping for all frames.
-                 */
-                for (cur = 0; cur < last_frame; cur += FRAME_SIZE)
-                        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
+        /*
+         * PA2KA(identity) mapping for all low-memory frames.
+         */
+        for (cur = 0; cur < min(config.identity_size, config.physmem_end);
+            cur += FRAME_SIZE)
+                page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
                 
-                page_table_unlock(AS_KERNEL, true);
+        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);
 }
 
@@ -94 +98 @@
 }
 
-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++)
-                page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE | PAGE_WRITE);
-        
-        page_table_unlock(AS_KERNEL, true);
-        
-        last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
-        
-        return virtaddr;
-}
-
 /** @}
  */