mips/malta: load the initrd at the end of the low memory

Currently the malta board is loading the initrd just after the kernel.
This doesn't work for kaslr enabled kernels, as the initrd ends-up being
overwritten.

Move the initrd at the end of the low memory, that should leave a
sufficient gap for kaslr.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Tested-by: NYongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: NYongbok Kim <yongbok.kim@imgtec.com>

hw/mips/mips_malta.c

@@ -841,8 +841,9 @@ static int64_t load_kernel (void)
     if (loaderparams.initrd_filename) {
         initrd_size = get_image_size (loaderparams.initrd_filename);
         if (initrd_size > 0) {
-            initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
-            if (initrd_offset + initrd_size > ram_size) {
+            initrd_offset = (loaderparams.ram_low_size - initrd_size
+                             - ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
+            if (kernel_high >= initrd_offset) {
                 fprintf(stderr,
                         "qemu: memory too small for initial ram disk '%s'\n",
                         loaderparams.initrd_filename);