Changeset bf9afa07 in mainline for libc/generic/as.c

Timestamp:

2006-06-02T11:35:05Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

2d22049

Parents:

49d072e

Message:

Allocation function for allocating free areas for mmap, map_physmem etc.

File:

• libc/generic/as.c (modified) (4 diffs)

libc/generic/as.c

@@ -27 +27 @@
  */ 
 
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ddi.h>
+#include <sysinfo.h>
+#include <align.h>
+#include <as.h>
+#include <ipc/fb.h>
+#include <ipc/ipc.h>
+#include <ipc/ns.h>
+#include <ipc/services.h>
+#include <kernel/errno.h>
+
+
 #include <as.h>
 #include <libc.h>
 #include <unistd.h>
-#include <task.h>
+#include <align.h>
 
 /** Create address space area.
@@ -71 +85 @@
 static size_t heapsize = 0;
 static size_t maxheapsize = (size_t)(-1);
+
+static void * last_allocated = 0;
+
 /* Start of heap linker symbol */
 extern char _heap;
@@ -108 +125 @@
 }
 
+/** Set maximum heap size and return pointer just after the heap */
 void *set_maxheapsize(size_t mhs)
 {
@@ -115 +133 @@
 
 }
+
+/** Return pointer to some unmapped area, where fits new as_area
+ *
+ * TODO: make some first_fit/... algorithm, we are now just incrementing
+ *       the pointer to last area
+ */
+void * as_get_mappable_page(size_t sz)
+{
+        void *res;
+
+        /* Set heapsize to some meaningful value */
+        if (maxheapsize == -1)
+                set_maxheapsize(ALIGN_UP(USER_ADDRESS_SPACE_SIZE_ARCH>>1,PAGE_SIZE));
+        if (!last_allocated)
+                last_allocated = ALIGN_UP((void *)&_heap + maxheapsize, PAGE_SIZE);
+        
+        sz = ALIGN_UP(sz, PAGE_SIZE);
+        res = last_allocated;
+        last_allocated += sz;
+
+        return res;
+}