Add the ability to reset the machine using the RESET_REG in ACPI's FADT table.
Signed-off-by: Aaron Durbin <adurbin@google.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -21,7 +21,7 @@ obj-$(CONFIG_X86) += blacklist.o
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#
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#
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# ACPI Core Subsystem (Interpreter)
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# ACPI Core Subsystem (Interpreter)
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#
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#
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obj-y += osl.o utils.o \
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obj-y += osl.o utils.o reboot.o\
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dispatcher/ events/ executer/ hardware/ \
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dispatcher/ events/ executer/ hardware/ \
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namespace/ parser/ resources/ tables/ \
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namespace/ parser/ resources/ tables/ \
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utilities/
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utilities/
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@ -0,0 +1,50 @@
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <acpi/reboot.h>
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void acpi_reboot(void)
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{
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struct acpi_generic_address *rr;
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struct pci_bus *bus0;
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u8 reset_value;
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unsigned int devfn;
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if (acpi_disabled)
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return;
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rr = &acpi_gbl_FADT.reset_register;
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/* Is the reset register supported? */
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if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
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rr->bit_width != 8 || rr->bit_offset != 0)
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return;
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reset_value = acpi_gbl_FADT.reset_value;
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/* The reset register can only exist in I/O, Memory or PCI config space
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* on a device on bus 0. */
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switch (rr->space_id) {
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case ACPI_ADR_SPACE_PCI_CONFIG:
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/* The reset register can only live on bus 0. */
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bus0 = pci_find_bus(0, 0);
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if (!bus0)
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return;
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/* Form PCI device/function pair. */
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devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
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(rr->address >> 16) & 0xffff);
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printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG.");
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/* Write the value that resets us. */
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pci_bus_write_config_byte(bus0, devfn,
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(rr->address & 0xffff), reset_value);
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break;
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case ACPI_ADR_SPACE_SYSTEM_MEMORY:
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case ACPI_ADR_SPACE_SYSTEM_IO:
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printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n");
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acpi_hw_low_level_write(8, reset_value, rr);
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break;
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}
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/* Wait ten seconds */
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acpi_os_stall(10000000);
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}
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@ -1,9 +1,11 @@
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#ifndef __ACPI_REBOOT_H
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#define __ACPI_REBOOT_H
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#ifdef CONFIG_ACPI
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extern void acpi_reboot(void);
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#else
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static inline void acpi_reboot(void) { }
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#endif
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/*
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* Dummy placeholder to make the EFI patches apply to the x86 tree.
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* Andrew/Len, please just kill this file if you encounter it.
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*/
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#ifndef acpi_reboot
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# define acpi_reboot() do { } while (0)
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#endif
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#endif
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