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OvmfPkg: Q35: Use correct ACPI PM control register:bit

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On PIIX4, function 3, the PMREGMISC register at offset 0x80, with
default value 0x00 has its bit 0 (PMIOSE) indicate whether the PM
IO space given in the PMBA register (offset 0x40) is enabled.
PMBA must be configured *before* setting this bit.

On Q35/ICH9+, function 0x1f, the equivalent role is fulfilled by
bit 7 (ACPI_EN) in the ACPI Control Register (ACPI_CNTL) at offset
0x44, also with a default value of 0x00.

Currently, OVMF hangs when Q35 reboots, because while PMBA is reset
by QEMU, the register at offset 0x80 (matching PMREGMISC on PIIX4)
is not reset, since it has a completely different meaning on LPC.
As such, the power management initialization logic in OVMF finds
the "PMIOSE" bit enabled after a reboot and decides to skip setting
PMBA. This causes the ACPI timer tick routine to read a constant
value from the wrong register, which in turn causes the ACPI delay
loop to hang indefinitely.

This patch modifies the Base[Rom]AcpiTimerLib constructors and the
PlatformPei ACPI PM init routines to use ACPI_CNTL:ACPI_EN instead
of PMREGMISC:PMIOSE when running on Q35.

Reported-by: Reza Jelveh <reza.jelveh@tuhh.de>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17076 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Gabriel Somlo
2015-03-26 19:06:07 +00:00
committed by lersek
parent 903d1fa991
commit e2ab3f819f
3 changed files with 45 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.c
View File

@@ -22,8 +22,9 @@
//
// Power Management PCI Configuration Register fields
//
#define PMBA_RTE BIT0
#define PMIOSE BIT0
#define PMBA_RTE BIT0
#define PIIX4_PMIOSE BIT0
#define Q35_ACPI_EN BIT7
//
// Offset in the Power Management Base Address to the ACPI Timer
@@ -47,7 +48,8 @@ AcpiTimerLibConstructor (
{
UINT16 HostBridgeDevId;
UINTN Pmba;
UINTN PmRegMisc;
UINTN AcpiCtlReg;
UINT8 AcpiEnBit;
//
// Query Host Bridge DID to determine platform type
@@ -55,12 +57,14 @@ AcpiTimerLibConstructor (
HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
switch (HostBridgeDevId) {
case INTEL_82441_DEVICE_ID:
Pmba = POWER_MGMT_REGISTER_PIIX4 (0x40);
PmRegMisc = POWER_MGMT_REGISTER_PIIX4 (0x80);
Pmba = POWER_MGMT_REGISTER_PIIX4 (0x40);
AcpiCtlReg = POWER_MGMT_REGISTER_PIIX4 (0x80); // PMREGMISC
AcpiEnBit = PIIX4_PMIOSE;
break;
case INTEL_Q35_MCH_DEVICE_ID:
Pmba = POWER_MGMT_REGISTER_Q35 (0x40);
PmRegMisc = POWER_MGMT_REGISTER_Q35 (0x80);
Pmba = POWER_MGMT_REGISTER_Q35 (0x40);
AcpiCtlReg = POWER_MGMT_REGISTER_Q35 (0x44); // ACPI_CNTL
AcpiEnBit = Q35_ACPI_EN;
break;
default:
DEBUG ((EFI_D_ERROR, "%a: Unknown Host Bridge Device ID: 0x%04x\n",
@@ -72,7 +76,7 @@ AcpiTimerLibConstructor (
//
// Check to see if the Power Management Base Address is already enabled
//
if ((PciRead8 (PmRegMisc) & PMIOSE) == 0) {
if ((PciRead8 (AcpiCtlReg) & AcpiEnBit) == 0) {
//
// If the Power Management Base Address is not programmed,
// then program the Power Management Base Address from a PCD.
@@ -80,9 +84,9 @@ AcpiTimerLibConstructor (
PciAndThenOr32 (Pmba, (UINT32) ~0xFFC0, PcdGet16 (PcdAcpiPmBaseAddress));
//
// Enable PMBA I/O port decodes in PMREGMISC
// Enable PMBA I/O port decodes
//
PciOr8 (PmRegMisc, PMIOSE);
PciOr8 (AcpiCtlReg, AcpiEnBit);
}
return RETURN_SUCCESS;