1 files changed, 82 insertions, 0 deletions
diff --git a/grub-core/lib/i386/halt.c b/grub-core/lib/i386/halt.c
new file mode 100644
index 0000000..2364fe4
--- /dev/null
+++ b/grub-core/lib/i386/halt.c
@@ -0,0 +1,82 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008  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/cpu/io.h>
+#include <grub/misc.h>
+#include <grub/acpi.h>
+#include <grub/i18n.h>
+#include <grub/pci.h>
+#include <grub/mm.h>
+
+const char bochs_shutdown[] = "Shutdown";
+
+/*
+ *  This call is special...  it never returns...  in fact it should simply
+ *  hang at this point!
+ */
+static inline void  __attribute__ ((noreturn))
+stop (void)
+{
+  asm volatile ("cli");
+  while (1)
+    {
+      asm volatile ("hlt");
+    }
+}
+
+static int
+grub_shutdown_pci_iter (grub_pci_device_t dev, grub_pci_id_t pciid,
+			void *data __attribute__ ((unused)))
+{
+  /* QEMU.  */
+  if (pciid == 0x71138086)
+    {
+      grub_pci_address_t addr;
+      addr = grub_pci_make_address (dev, 0x40);
+      grub_pci_write (addr, 0x7001);
+      addr = grub_pci_make_address (dev, 0x80);
+      grub_pci_write (addr, grub_pci_read (addr) | 1);
+      grub_outw (0x2000, 0x7004);
+    }
+  return 0;
+}
+
+void
+grub_halt (void)
+{
+  unsigned int i;
+
+#if defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_MULTIBOOT)
+  grub_acpi_halt ();
+#endif
+
+  /* Disable interrupts.  */
+  asm volatile ("cli");
+
+  /* Bochs, QEMU, etc. Removed in newer QEMU releases.  */
+  for (i = 0; i < sizeof (bochs_shutdown) - 1; i++)
+    grub_outb (bochs_shutdown[i], 0x8900);
+
+  grub_pci_iterate (grub_shutdown_pci_iter, NULL);
+
+  grub_puts_ (N_("GRUB doesn't know how to halt this machine yet!"));
+
+  /* In order to return we'd have to check what the previous status of IF
+     flag was.  But user most likely doesn't want to return anyway ...  */
+  stop ();
+}