1 files changed, 107 insertions, 0 deletions
diff --git a/grub-core/kern/i386/qemu/mmap.c b/grub-core/kern/i386/qemu/mmap.c
new file mode 100644
index 0000000..f449637
--- /dev/null
+++ b/grub-core/kern/i386/qemu/mmap.c
@@ -0,0 +1,107 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/i386/memory.h>
+#include <grub/machine/memory.h>
+#include <grub/machine/boot.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/cmos.h>
+#include <grub/offsets.h>
+
+#define QEMU_CMOS_MEMSIZE_HIGH		0x35
+#define QEMU_CMOS_MEMSIZE_LOW		0x34
+
+#define QEMU_CMOS_MEMSIZE2_HIGH		0x31
+#define QEMU_CMOS_MEMSIZE2_LOW		0x30
+
+#define min(a,b)	((a) > (b) ? (b) : (a))
+
+extern char _start[];
+extern char _end[];
+
+static grub_uint64_t mem_size, above_4g;
+
+void
+grub_machine_mmap_init (void)
+{
+  grub_uint8_t high, low, b, c, d;
+  grub_cmos_read (QEMU_CMOS_MEMSIZE_HIGH, &high);
+  grub_cmos_read (QEMU_CMOS_MEMSIZE_LOW, &low);
+  mem_size = ((grub_uint64_t) high) << 24
+    | ((grub_uint64_t) low) << 16;
+  if (mem_size > 0)
+    {
+      /* Don't ask... */
+      mem_size += (16 * 1024 * 1024);
+    }
+  else
+    {
+      grub_cmos_read (QEMU_CMOS_MEMSIZE2_HIGH, &high);
+      grub_cmos_read (QEMU_CMOS_MEMSIZE2_LOW, &low);
+      mem_size
+	= ((((grub_uint64_t) high) << 18) | (((grub_uint64_t) low) << 10))
+	+ 1024 * 1024;
+    }
+
+  grub_cmos_read (0x5b, &b);
+  grub_cmos_read (0x5c, &c);
+  grub_cmos_read (0x5d, &d);
+  above_4g = (((grub_uint64_t) b) << 16)
+    | (((grub_uint64_t) c) << 24)
+    | (((grub_uint64_t) d) << 32);
+}
+
+grub_err_t
+grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
+{
+  if (hook (0x0,
+	    (grub_addr_t) _start,
+	    GRUB_MEMORY_AVAILABLE, hook_data))
+    return 1;
+
+  if (hook ((grub_addr_t) _end,
+           0xa0000 - (grub_addr_t) _end,
+           GRUB_MEMORY_AVAILABLE, hook_data))
+    return 1;
+
+  if (hook (GRUB_MEMORY_MACHINE_UPPER,
+	    0x100000 - GRUB_MEMORY_MACHINE_UPPER,
+	    GRUB_MEMORY_RESERVED, hook_data))
+    return 1;
+
+  /* Everything else is free.  */
+  if (hook (0x100000,
+	    min (mem_size, (grub_uint32_t) -GRUB_BOOT_MACHINE_SIZE) - 0x100000,
+	    GRUB_MEMORY_AVAILABLE, hook_data))
+    return 1;
+
+  /* Protect boot.img, which contains the gdt.  It is mapped at the top of memory
+     (it is also mapped below 0x100000, but we already reserved that area).  */
+  if (hook ((grub_uint32_t) -GRUB_BOOT_MACHINE_SIZE,
+	    GRUB_BOOT_MACHINE_SIZE,
+	    GRUB_MEMORY_RESERVED, hook_data))
+    return 1;
+
+  if (above_4g != 0 && hook (0x100000000ULL, above_4g,
+			     GRUB_MEMORY_AVAILABLE, hook_data))
+    return 1;
+
+  return 0;
+}