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Tip revision: 771c577c23bac90597c685971d7297ea00f99d11 authored by Linus Torvalds on 20 May 2018, 22:31:38 UTC
Linux 4.17-rc6
Linux 4.17-rc6
Tip revision: 771c577
reboot.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/reboot.h>
void acpi_reboot(void)
{
struct acpi_generic_address *rr;
struct pci_bus *bus0;
u8 reset_value;
unsigned int devfn;
if (acpi_disabled)
return;
rr = &acpi_gbl_FADT.reset_register;
/* ACPI reset register was only introduced with v2 of the FADT */
if (acpi_gbl_FADT.header.revision < 2)
return;
/* Is the reset register supported? The spec says we should be
* checking the bit width and bit offset, but Windows ignores
* these fields */
if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER))
return;
reset_value = acpi_gbl_FADT.reset_value;
/* The reset register can only exist in I/O, Memory or PCI config space
* on a device on bus 0. */
switch (rr->space_id) {
case ACPI_ADR_SPACE_PCI_CONFIG:
/* The reset register can only live on bus 0. */
bus0 = pci_find_bus(0, 0);
if (!bus0)
return;
/* Form PCI device/function pair. */
devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
(rr->address >> 16) & 0xffff);
printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG.");
/* Write the value that resets us. */
pci_bus_write_config_byte(bus0, devfn,
(rr->address & 0xffff), reset_value);
break;
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
case ACPI_ADR_SPACE_SYSTEM_IO:
printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n");
acpi_reset();
break;
}
}