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123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* halt.c - command to halt the computer. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2005,2007,2009 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/dl.h>
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#include <grub/misc.h>
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#include <grub/extcmd.h>
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#include <grub/i18n.h>
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#include <grub/machine/int.h>
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static const struct grub_arg_option options[] =
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{
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{"no-apm", 'n', 0, N_("Do not use APM to halt the computer."), 0, 0},
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{0, 0, 0, 0, 0, 0}
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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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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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/*
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* Halt the system, using APM if possible. If NO_APM is true, don't use
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* APM even if it is available.
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*/
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void
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grub_halt (int no_apm)
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{
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struct grub_bios_int_registers regs;
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if (no_apm)
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stop ();
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/* detect APM */
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regs.eax = 0x5300;
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regs.ebx = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x15, ®s);
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if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
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stop ();
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/* disconnect APM first */
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regs.eax = 0x5304;
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regs.ebx = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x15, ®s);
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/* connect APM */
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regs.eax = 0x5301;
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regs.ebx = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x15, ®s);
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if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
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stop ();
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/* set APM protocol level - 1.1 or bust. (this covers APM 1.2 also) */
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regs.eax = 0x530E;
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regs.ebx = 0;
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regs.ecx = 0x0101;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x15, ®s);
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if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
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stop ();
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/* set the power state to off */
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regs.eax = 0x5307;
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regs.ebx = 1;
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regs.ecx = 3;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x15, ®s);
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/* shouldn't reach here */
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stop ();
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}
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static grub_err_t
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grub_cmd_halt (grub_extcmd_t cmd,
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int argc __attribute__ ((unused)),
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char **args __attribute__ ((unused)))
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{
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struct grub_arg_list *state = cmd->state;
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int no_apm = 0;
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if (state[0].set)
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no_apm = 1;
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grub_halt (no_apm);
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return 0;
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}
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static grub_extcmd_t cmd;
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GRUB_MOD_INIT(halt)
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{
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cmd = grub_register_extcmd ("halt", grub_cmd_halt, GRUB_COMMAND_FLAG_BOTH,
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"[-n]",
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N_("Halt the system, if possible using APM."),
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options);
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}
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GRUB_MOD_FINI(halt)
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{
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grub_unregister_extcmd (cmd);
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}
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