mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-01-14 09:09:56 +00:00
6734fe57a0
Windows ignores the bit_offset and bit_width, despite the spec requiring that they be validated. Drop the checks so that we match this behaviour. Windows also goes straight for the keyboard controller if the ACPI reboot fails, so we shouldn't sleep if we're still alive. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
|
|
#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;
|
|
|
|
/* 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;
|
|
}
|
|
}
|