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authorYang Zhang <yang.z.zhang@intel.com>2015-08-28 09:58:54 +0800
committerYang Zhang <yang.z.zhang@intel.com>2015-09-01 12:44:00 +0800
commite44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch)
tree66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/u-boot/common/memsize.c
parent9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff)
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/u-boot/common/memsize.c')
-rw-r--r--qemu/roms/u-boot/common/memsize.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/common/memsize.c b/qemu/roms/u-boot/common/memsize.c
new file mode 100644
index 000000000..589400d3b
--- /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
+}