82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/cpu/io.h>
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#include <grub/misc.h>
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#include <grub/acpi.h>
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#include <grub/i18n.h>
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#include <grub/pci.h>
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#include <grub/mm.h>
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const char bochs_shutdown[] = "Shutdown";
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/*
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* This call is special... it never returns... in fact it should simply
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* hang at this point!
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*/
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static inline void __attribute__ ((noreturn))
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stop (void)
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{
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asm volatile ("cli");
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while (1)
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{
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asm volatile ("hlt");
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}
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}
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static int
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grub_shutdown_pci_iter (grub_pci_device_t dev, grub_pci_id_t pciid,
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void *data __attribute__ ((unused)))
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{
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/* QEMU. */
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if (pciid == 0x71138086)
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{
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grub_pci_address_t addr;
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addr = grub_pci_make_address (dev, 0x40);
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grub_pci_write (addr, 0x7001);
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addr = grub_pci_make_address (dev, 0x80);
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grub_pci_write (addr, grub_pci_read (addr) | 1);
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grub_outw (0x2000, 0x7004);
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}
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return 0;
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}
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void
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grub_halt (void)
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{
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unsigned int i;
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#if defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_MULTIBOOT)
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grub_acpi_halt ();
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#endif
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/* Disable interrupts. */
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__asm__ __volatile__ ("cli");
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/* Bochs, QEMU, etc. Removed in newer QEMU releases. */
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for (i = 0; i < sizeof (bochs_shutdown) - 1; i++)
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grub_outb (bochs_shutdown[i], 0x8900);
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grub_pci_iterate (grub_shutdown_pci_iter, NULL);
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grub_puts_ (N_("GRUB doesn't know how to halt this machine yet!"));
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/* In order to return we'd have to check what the previous status of IF
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flag was. But user most likely doesn't want to return anyway ... */
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stop ();
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}
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