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/******************************************************************************
* arch/x86/shutdown.c
*
* x86-specific shutdown handling.
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/sched.h>
#include <xen/smp.h>
#include <xen/delay.h>
#include <xen/dmi.h>
#include <xen/irq.h>
#include <xen/nmi.h>
#include <xen/console.h>
#include <xen/shutdown.h>
#include <xen/acpi.h>
#include <xen/efi.h>
#include <asm/msr.h>
#include <asm/regs.h>
#include <asm/mc146818rtc.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mpspec.h>
#include <asm/tboot.h>
#include <asm/apic.h>
enum reboot_type {
BOOT_TRIPLE = 't',
BOOT_KBD = 'k',
BOOT_ACPI = 'a',
BOOT_BIOS = 'b',
};
static long no_idt[2];
static int reboot_mode;
/*
* reboot=b[ios] | t[riple] | k[bd] | n[o] [, [w]arm | [c]old]
* warm Don't set the cold reboot flag
* cold Set the cold reboot flag
* bios Reboot by jumping through the BIOS (only for X86_32)
* triple Force a triple fault (init)
* kbd Use the keyboard controller. cold reset (default)
* acpi Use the RESET_REG in the FADT
*/
static enum reboot_type reboot_type = BOOT_ACPI;
static void __init set_reboot_type(char *str)
{
for ( ; ; )
{
switch ( *str )
{
case 'n': /* no reboot */
opt_noreboot = 1;
break;
case 'w': /* "warm" reboot (no memory testing etc) */
reboot_mode = 0x1234;
break;
case 'c': /* "cold" reboot (with memory testing etc) */
reboot_mode = 0x0;
break;
case 'b':
case 'a':
case 'k':
case 't':
reboot_type = *str;
break;
}
if ( (str = strchr(str, ',')) == NULL )
break;
str++;
}
}
custom_param("reboot", set_reboot_type);
static inline void kb_wait(void)
{
int i;
for ( i = 0; i < 0x10000; i++ )
if ( (inb_p(0x64) & 0x02) == 0 )
break;
}
static void __attribute__((noreturn)) __machine_halt(void *unused)
{
local_irq_disable();
for ( ; ; )
halt();
}
void machine_halt(void)
{
watchdog_disable();
console_start_sync();
local_irq_enable();
smp_call_function(__machine_halt, NULL, 0);
__machine_halt(NULL);
}
static void __machine_restart(void *pdelay)
{
machine_restart(*(unsigned int *)pdelay);
}
void machine_restart(unsigned int delay_millisecs)
{
unsigned int i, attempt;
enum reboot_type orig_reboot_type = reboot_type;
watchdog_disable();
console_start_sync();
spin_debug_disable();
acpi_dmar_reinstate();
local_irq_enable();
/* Ensure we are the boot CPU. */
if ( get_apic_id() != boot_cpu_physical_apicid )
{
/* Send IPI to the boot CPU (logical cpu 0). */
on_selected_cpus(cpumask_of(0), __machine_restart,
&delay_millisecs, 0);
for ( ; ; )
halt();
}
/*
* We may be called from an interrupt context, and various functions we
* may need to call (alloc_domheap_pages, map_domain_page, ...) assert that
* they are not called from interrupt context. This hack keeps them happy.
*/
local_irq_count(0) = 0;
smp_send_stop();
mdelay(delay_millisecs);
if ( tboot_in_measured_env() )
tboot_shutdown(TB_SHUTDOWN_REBOOT);
efi_reset_system(reboot_mode != 0);
/* Rebooting needs to touch the page at absolute address 0. */
*((unsigned short *)__va(0x472)) = reboot_mode;
for ( attempt = 0; ; attempt++ )
{
switch ( reboot_type )
{
case BOOT_KBD:
/* Pulse the keyboard reset line. */
for ( i = 0; i < 100; i++ )
{
kb_wait();
udelay(50);
outb(0xfe,0x64); /* pulse reset low */
udelay(50);
}
/*
* If this platform supports ACPI reset, we follow a Windows-style
* reboot attempt sequence:
* ACPI -> KBD -> ACPI -> KBD
* After this we revert to our usual sequence:
* KBD -> TRIPLE -> KBD -> TRIPLE -> KBD -> ...
*/
reboot_type = (((attempt == 1) && (orig_reboot_type == BOOT_ACPI))
? BOOT_ACPI : BOOT_TRIPLE);
break;
case BOOT_TRIPLE:
asm volatile ( "lidt %0 ; int3" : "=m" (no_idt) );
reboot_type = BOOT_KBD;
break;
case BOOT_BIOS:
/* unsupported on x86_64 */
reboot_type = BOOT_KBD;
break;
case BOOT_ACPI:
acpi_reboot();
reboot_type = BOOT_KBD;
break;
}
}
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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