cb7b12ee3c
The reset requested via the keyboard controller (port 0x64) is actually a
soft reset, but qemu has supported it since forever (plus qemu has not
distinguished between hard reset and soft reset, although this is changing
now). Therefore leave the current IoWrite() in place for compatibility.
On qemu versions with commit 1ec4ba74 ("PIIX3: reset the VM when the Reset
Control Register's RCPU bit gets set"), use the PIIX3 RCR as first choice.
In the future qemu will act differently on soft vs. hard reset requests,
and we should honor that in ResetCold().
Writing to ioport 0xCF9 on qemu builds prior to commit 1ec4ba74 should
have no effect. Access to the PCI host config register went through
several implementations in qemu. Commit 9f6f0423 ("pci_host: rewrite
using rwhandler") seems safe, both before and after.
Commit d0ed8076 ("pci_host: convert conf index and data ports to memory
API") inadvertently dropped the alignment/size check, causing a boot
regression on NetBSD. It was fixed about six months later in commit
cdde6ffc, which is current. Translating that to qemu releases, the bug
was visible from v1.0 to v1.1.0.
On physical hardware cycling between reset methods is sometimes necessary
<http://mjg59.dreamwidth.org/3561.html>. On qemu the port access should
trap immediately.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14157 6f19259b-4bc3-4df7-8a09-765794883524
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/** @file
|
|
Reset System Library functions for OVMF
|
|
|
|
Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
|
|
This program and the accompanying materials
|
|
are licensed and made available under the terms and conditions of the BSD License
|
|
which accompanies this distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
|
|
#include <Base.h>
|
|
|
|
#include <Library/BaseLib.h>
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/IoLib.h>
|
|
|
|
VOID
|
|
AcpiPmControl (
|
|
UINTN SuspendType
|
|
)
|
|
{
|
|
ASSERT (SuspendType < 6);
|
|
|
|
IoAndThenOr16 (0x404, (UINT16) ~0x3c00, (UINT16) (SuspendType << 10));
|
|
IoOr16 (0x404, BIT13);
|
|
CpuDeadLoop ();
|
|
}
|
|
|
|
/**
|
|
Calling this function causes a system-wide reset. This sets
|
|
all circuitry within the system to its initial state. This type of reset
|
|
is asynchronous to system operation and operates without regard to
|
|
cycle boundaries.
|
|
|
|
System reset should not return, if it returns, it means the system does
|
|
not support cold reset.
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
ResetCold (
|
|
VOID
|
|
)
|
|
{
|
|
IoWrite8 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
|
|
IoWrite8 (0x64, 0xfe); // 2nd choice: keyboard controller
|
|
}
|
|
|
|
/**
|
|
Calling this function causes a system-wide initialization. The processors
|
|
are set to their initial state, and pending cycles are not corrupted.
|
|
|
|
System reset should not return, if it returns, it means the system does
|
|
not support warm reset.
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
ResetWarm (
|
|
VOID
|
|
)
|
|
{
|
|
IoWrite8 (0x64, 0xfe);
|
|
}
|
|
|
|
/**
|
|
Calling this function causes the system to enter a power state equivalent
|
|
to the ACPI G2/S5 or G3 states.
|
|
|
|
System shutdown should not return, if it returns, it means the system does
|
|
not support shut down reset.
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
ResetShutdown (
|
|
VOID
|
|
)
|
|
{
|
|
AcpiPmControl (0);
|
|
ASSERT (FALSE);
|
|
}
|
|
|
|
|
|
/**
|
|
Calling this function causes the system to enter a power state for capsule
|
|
update.
|
|
|
|
Reset update should not return, if it returns, it means the system does
|
|
not support capsule update.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
EnterS3WithImmediateWake (
|
|
VOID
|
|
)
|
|
{
|
|
AcpiPmControl (1);
|
|
ASSERT (FALSE);
|
|
}
|