/*
* linux/arch/arm/mm/mmap.c
*/
-#include <linux/config.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
*/
cache_type = read_cpuid(CPUID_CACHETYPE);
if (cache_type != read_cpuid(CPUID_ID)) {
- aliasing = (cache_type | cache_type >> 12) & (1 << 9);
+ aliasing = (cache_type | cache_type >> 12) & (1 << 11);
if (aliasing)
do_align = filp || flags & MAP_SHARED;
}
(!vma || addr + len <= vma->vm_start))
return addr;
}
- start_addr = addr = mm->free_area_cache;
+ if (len > mm->cached_hole_size) {
+ start_addr = addr = mm->free_area_cache;
+ } else {
+ start_addr = addr = TASK_UNMAPPED_BASE;
+ mm->cached_hole_size = 0;
+ }
full_search:
if (do_align)
*/
if (start_addr != TASK_UNMAPPED_BASE) {
start_addr = addr = TASK_UNMAPPED_BASE;
+ mm->cached_hole_size = 0;
goto full_search;
}
return -ENOMEM;
mm->free_area_cache = addr + len;
return addr;
}
+ if (addr + mm->cached_hole_size < vma->vm_start)
+ mm->cached_hole_size = vma->vm_start - addr;
addr = vma->vm_end;
if (do_align)
addr = COLOUR_ALIGN(addr, pgoff);
}
}
+
+/*
+ * You really shouldn't be using read() or write() on /dev/mem. This
+ * might go away in the future.
+ */
+int valid_phys_addr_range(unsigned long addr, size_t size)
+{
+ if (addr + size > __pa(high_memory))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * We don't use supersection mappings for mmap() on /dev/mem, which
+ * means that we can't map the memory area above the 4G barrier into
+ * userspace.
+ */
+int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
+{
+ return !(pfn + (size >> PAGE_SHIFT) > 0x00100000);
+}