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/*
* 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 ();
}
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