Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / common / memsize.c

diff --git a/qemu/roms/u-boot/common/memsize.c b/qemu/roms/u-boot/common/memsize.c
new file mode 100644 (file)
index 0000000..589400d
--- /dev/null
+++ b/qemu/roms/u-boot/common/memsize.c
@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef __PPC__
+/*
+ * At least on G2 PowerPC cores, sequential accesses to non-existent
+ * memory must be synchronized.
+ */
+# include <asm/io.h>   /* for sync() */
+#else
+# define sync()                /* nothing */
+#endif
+
+/*
+ * Check memory range for valid RAM. A simple memory test determines
+ * the actually available RAM size between addresses `base' and
+ * `base + maxsize'.
+ */
+long get_ram_size(long *base, long maxsize)
+{
+       volatile long *addr;
+       long           save[32];
+       long           cnt;
+       long           val;
+       long           size;
+       int            i = 0;
+
+       for (cnt = (maxsize / sizeof (long)) >> 1; cnt > 0; cnt >>= 1) {
+               addr = base + cnt;      /* pointer arith! */
+               sync ();
+               save[i++] = *addr;
+               sync ();
+               *addr = ~cnt;
+       }
+
+       addr = base;
+       sync ();
+       save[i] = *addr;
+       sync ();
+       *addr = 0;
+
+       sync ();
+       if ((val = *addr) != 0) {
+               /* Restore the original data before leaving the function.
+                */
+               sync ();
+               *addr = save[i];
+               for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
+                       addr  = base + cnt;
+                       sync ();
+                       *addr = save[--i];
+               }
+               return (0);
+       }
+
+       for (cnt = 1; cnt < maxsize / sizeof (long); cnt <<= 1) {
+               addr = base + cnt;      /* pointer arith! */
+               val = *addr;
+               *addr = save[--i];
+               if (val != ~cnt) {
+                       size = cnt * sizeof (long);
+                       /* Restore the original data before leaving the function.
+                        */
+                       for (cnt <<= 1; cnt < maxsize / sizeof (long); cnt <<= 1) {
+                               addr  = base + cnt;
+                               *addr = save[--i];
+                       }
+                       return (size);
+               }
+       }
+
+       return (maxsize);
+}
+
+phys_size_t __weak get_effective_memsize(void)
+{
+#ifndef CONFIG_VERY_BIG_RAM
+       return gd->ram_size;
+#else
+       /* limit stack to what we can reasonable map */
+       return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
+               CONFIG_MAX_MEM_MAPPED : gd->ram_size);
+#endif
+}