[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v12 5/6] acpi: build TPM Physical Presence inter
|
From: |
Marc-André Lureau |
|
Subject: |
Re: [Qemu-devel] [PATCH v12 5/6] acpi: build TPM Physical Presence interface |
|
Date: |
Thu, 13 Dec 2018 02:00:32 +0400 |
On Wed, Dec 12, 2018 at 8:16 PM Philippe Mathieu-Daudé
<address@hidden> wrote:
>
> On 9/10/18 10:32 AM, Marc-André Lureau wrote:
> > From: Stefan Berger <address@hidden>
> >
> > The TPM Physical Presence interface consists of an ACPI part, a shared
> > memory part, and code in the firmware. Users can send messages to the
> > firmware by writing a code into the shared memory through invoking the
> > ACPI code. When a reboot happens, the firmware looks for the code and
> > acts on it by sending sequences of commands to the TPM.
> >
> > This patch adds the ACPI code. It is similar to the one in EDK2 but doesn't
> > assume that SMIs are necessary to use. It uses a similar datastructure for
> > the shared memory as EDK2 does so that EDK2 and SeaBIOS could both make use
> > of it. I extended the shared memory data structure with an array of 256
> > bytes, one for each code that could be implemented. The array contains
> > flags describing the individual codes. This decouples the ACPI
> > implementation
> > from the firmware implementation.
> >
> > The underlying TCG specification is accessible from the following page.
> >
> > https://trustedcomputinggroup.org/tcg-physical-presence-interface-specification/
> >
> > This patch implements version 1.30.
> >
> > Signed-off-by: Stefan Berger <address@hidden>
> > [ Marc-André - ACPI code improvements and windows fixes ]
> > Signed-off-by: Marc-André Lureau <address@hidden>
> > Acked-by: Michael S. Tsirkin <address@hidden>
> > Reviewed-by: Igor Mammedov <address@hidden>
> > ---
> > include/hw/acpi/tpm.h | 8 +
> > hw/i386/acpi-build.c | 393 +++++++++++++++++++++++++++++++++++++++++-
>
> The spec doesnt' look X86 specific, I'd add this code in "hw/acpi/tpm.c"
ok
>
> > docs/specs/tpm.txt | 83 +++++++++
> > 3 files changed, 481 insertions(+), 3 deletions(-)
> >
> > diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
> > index a6109a97fc..ecccb96933 100644
> > --- a/include/hw/acpi/tpm.h
> > +++ b/include/hw/acpi/tpm.h
> > @@ -197,4 +197,12 @@ REG32(CRB_DATA_BUFFER, 0x80)
> > #define TPM_PPI_VERSION_NONE 0
> > #define TPM_PPI_VERSION_1_30 1
> >
> > +/* whether function is blocked by BIOS settings; bits 0, 1, 2 */
> > +#define TPM_PPI_FUNC_NOT_IMPLEMENTED (0 << 0)
> > +#define TPM_PPI_FUNC_BIOS_ONLY (1 << 0)
> > +#define TPM_PPI_FUNC_BLOCKED (2 << 0)
> > +#define TPM_PPI_FUNC_ALLOWED_USR_REQ (3 << 0)
> > +#define TPM_PPI_FUNC_ALLOWED_USR_NOT_REQ (4 << 0)
> > +#define TPM_PPI_FUNC_MASK (7 << 0)
> > +
> > #endif /* HW_ACPI_TPM_H */
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index c24f68df02..c5e9a6e11d 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -43,6 +43,7 @@
> > #include "hw/acpi/memory_hotplug.h"
> > #include "sysemu/tpm.h"
> > #include "hw/acpi/tpm.h"
> > +#include "hw/tpm/tpm_ppi.h"
> > #include "hw/acpi/vmgenid.h"
> > #include "sysemu/tpm_backend.h"
> > #include "hw/timer/mc146818rtc_regs.h"
> > @@ -1789,6 +1790,386 @@ static Aml *build_q35_osc_method(void)
> > return method;
> > }
> >
> > +static void
> > +build_tpm_ppi(TPMIf *tpm, Aml *dev)
> > +{
> > + Aml *method, *field, *ifctx, *ifctx2, *ifctx3, *func_mask,
> > + *not_implemented, *pak, *tpm2, *tpm3, *pprm, *pprq, *zero, *one;
> > +
> > + if (!object_property_get_bool(OBJECT(tpm), "ppi", &error_abort)) {
> > + return;
> > + }
> > +
> > + zero = aml_int(0);
> > + one = aml_int(1);
> > + func_mask = aml_int(TPM_PPI_FUNC_MASK);
> > + not_implemented = aml_int(TPM_PPI_FUNC_NOT_IMPLEMENTED);
> > +
> > + /*
> > + * TPP2 is for the registers that ACPI code used to pass
> > + * the PPI code and parameter (PPRQ, PPRM) to the firmware.
> > + */
> > + aml_append(dev,
> > + aml_operation_region("TPP2", AML_SYSTEM_MEMORY,
> > + aml_int(TPM_PPI_ADDR_BASE + 0x100),
> > + 0x5A));
> > + field = aml_field("TPP2", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
> > + aml_append(field, aml_named_field("PPIN", 8));
> > + aml_append(field, aml_named_field("PPIP", 32));
> > + aml_append(field, aml_named_field("PPRP", 32));
> > + aml_append(field, aml_named_field("PPRQ", 32));
> > + aml_append(field, aml_named_field("PPRM", 32));
> > + aml_append(field, aml_named_field("LPPR", 32));
> > + aml_append(dev, field);
> > + pprq = aml_name("PPRQ");
> > + pprm = aml_name("PPRM");
> > +
> > + /*
> > + * DerefOf in Windows is broken with SYSTEM_MEMORY. Use a dynamic
> > + * operation region inside of a method for getting FUNC[op].
> > + */
> > + method = aml_method("TPFN", 1, AML_SERIALIZED);
> > + {
> > + Aml *op = aml_arg(0);
> > + ifctx = aml_if(aml_lgreater_equal(op, aml_int(0x100)));
> > + {
> > + aml_append(ifctx, aml_return(zero));
> > + }
> > + aml_append(method, ifctx);
> > +
> > + aml_append(method,
> > + aml_operation_region("TPP1", AML_SYSTEM_MEMORY,
> > + aml_add(aml_int(TPM_PPI_ADDR_BASE), op, NULL), 0x1));
> > + field = aml_field("TPP1", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
> > + aml_append(field, aml_named_field("TPPF", 8));
> > + aml_append(method, field);
> > + aml_append(method, aml_return(aml_name("TPPF")));
> > + }
> > + aml_append(dev, method);
> > +
> > + /*
> > + * Use global TPM2 & TPM3 variables to workaround Windows ACPI bug
> > + * when returning packages.
> > + */
> > + pak = aml_package(2);
> > + aml_append(pak, zero);
> > + aml_append(pak, zero);
> > + aml_append(dev, aml_name_decl("TPM2", pak));
> > + tpm2 = aml_name("TPM2");
> > +
> > + pak = aml_package(3);
> > + aml_append(pak, zero);
> > + aml_append(pak, zero);
> > + aml_append(pak, zero);
> > + aml_append(dev, aml_name_decl("TPM3", pak));
> > + tpm3 = aml_name("TPM3");
> > +
> > + method = aml_method("_DSM", 4, AML_SERIALIZED);
> > + {
> > + uint8_t zerobyte[1] = { 0 };
> > + Aml *function, *arguments, *rev, *op, *op_arg, *op_flags, *uuid;
> > +
> > + uuid = aml_arg(0);
> > + rev = aml_arg(1);
> > + function = aml_arg(2);
> > + arguments = aml_arg(3);
> > + op = aml_local(0);
> > + op_flags = aml_local(1);
> > +
> > + ifctx = aml_if(
> > + aml_equal(uuid,
> > + aml_touuid("3DDDFAA6-361B-4EB4-A424-8D10089D1653")));
> > + {
> > + /* standard DSM query function */
> > + ifctx2 = aml_if(aml_equal(function, zero));
> > + {
> > + uint8_t byte_list[2] = { 0xff, 0x01 };
> > + aml_append(ifctx2, aml_return(aml_buffer(2, byte_list)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.0: 2.1.1 Get Physical Presence Interface Version
> > + *
> > + * Arg 2 (Integer): Function Index = 1
> > + * Arg 3 (Package): Arguments = Empty Package
> > + * Returns: Type: String
> > + */
> > + ifctx2 = aml_if(aml_equal(function, one));
> > + {
> > + aml_append(ifctx2, aml_return(aml_string("1.3")));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.0: 2.1.3 Submit TPM Operation Request to Pre-OS
> > Environment
> > + *
> > + * Arg 2 (Integer): Function Index = 2
> > + * Arg 3 (Package): Arguments = Package: Type: Integer
> > + * Operation Value of the Request
> > + * Returns: Type: Integer
> > + * 0: Success
> > + * 1: Operation Value of the Request Not Supported
> > + * 2: General Failure
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(2)));
> > + {
> > + /* get opcode */
> > + aml_append(ifctx2,
> > + aml_store(aml_derefof(aml_index(arguments,
> > + zero)), op));
> > +
> > + /* get opcode flags */
> > + aml_append(ifctx2,
> > + aml_store(aml_call1("TPFN", op), op_flags));
> > +
> > + /* if func[opcode] & TPM_PPI_FUNC_NOT_IMPLEMENTED */
> > + ifctx3 = aml_if(
> > + aml_equal(
> > + aml_and(op_flags, func_mask, NULL),
> > + not_implemented));
> > + {
> > + /* 1: Operation Value of the Request Not Supported */
> > + aml_append(ifctx3, aml_return(one));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + aml_append(ifctx2, aml_store(op, pprq));
> > + aml_append(ifctx2, aml_store(zero, pprm));
> > + /* 0: success */
> > + aml_append(ifctx2, aml_return(zero));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.0: 2.1.4 Get Pending TPM Operation Requested By the OS
> > + *
> > + * Arg 2 (Integer): Function Index = 3
> > + * Arg 3 (Package): Arguments = Empty Package
> > + * Returns: Type: Package of Integers
> > + * Integer 1: Function Return code
> > + * 0: Success
> > + * 1: General Failure
> > + * Integer 2: Pending operation requested by the OS
> > + * 0: None
> > + * >0: Operation Value of the Pending
> > Request
> > + * Integer 3: Optional argument to pending operation
> > + * requested by the OS
> > + * 0: None
> > + * >0: Argument Value of the Pending Request
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(3)));
> > + {
> > + /*
> > + * Revision ID of 1, no integer parameter beyond
> > + * parameter two are expected
> > + */
> > + ifctx3 = aml_if(aml_equal(rev, one));
> > + {
> > + /* TPM2[1] = PPRQ */
> > + aml_append(ifctx3,
> > + aml_store(pprq, aml_index(tpm2, one)));
> > + aml_append(ifctx3, aml_return(tpm2));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + /*
> > + * A return value of {0, 23, 1} indicates that
> > + * operation 23 with argument 1 is pending.
> > + */
> > + ifctx3 = aml_if(aml_equal(rev, aml_int(2)));
> > + {
> > + /* TPM3[1] = PPRQ */
> > + aml_append(ifctx3,
> > + aml_store(pprq, aml_index(tpm3, one)));
> > + /* TPM3[2] = PPRM */
> > + aml_append(ifctx3,
> > + aml_store(pprm, aml_index(tpm3,
> > aml_int(2))));
> > + aml_append(ifctx3, aml_return(tpm3));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.0: 2.1.5 Get Platform-Specific Action to Transition to
> > + * Pre-OS Environment
> > + *
> > + * Arg 2 (Integer): Function Index = 4
> > + * Arg 3 (Package): Arguments = Empty Package
> > + * Returns: Type: Integer
> > + * 0: None
> > + * 1: Shutdown
> > + * 2: Reboot
> > + * 3: OS Vendor-specific
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(4)));
> > + {
> > + /* reboot */
> > + aml_append(ifctx2, aml_return(aml_int(2)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.0: 2.1.6 Return TPM Operation Response to OS
> > Environment
> > + *
> > + * Arg 2 (Integer): Function Index = 5
> > + * Arg 3 (Package): Arguments = Empty Package
> > + * Returns: Type: Package of Integer
> > + * Integer 1: Function Return code
> > + * 0: Success
> > + * 1: General Failure
> > + * Integer 2: Most recent operation request
> > + * 0: None
> > + * >0: Operation Value of the most recent
> > request
> > + * Integer 3: Response to the most recent operation
> > request
> > + * 0: Success
> > + * 0x00000001..0x00000FFF: Corresponding
> > TPM
> > + * error code
> > + * 0xFFFFFFF0: User Abort or timeout of
> > dialog
> > + * 0xFFFFFFF1: firmware Failure
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(5)));
> > + {
> > + /* TPM3[1] = LPPR */
> > + aml_append(ifctx2,
> > + aml_store(aml_name("LPPR"),
> > + aml_index(tpm3, one)));
> > + /* TPM3[2] = PPRP */
> > + aml_append(ifctx2,
> > + aml_store(aml_name("PPRP"),
> > + aml_index(tpm3, aml_int(2))));
> > + aml_append(ifctx2, aml_return(tpm3));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.0: 2.1.7 Submit preferred user language
> > + *
> > + * Arg 2 (Integer): Function Index = 6
> > + * Arg 3 (Package): Arguments = String Package
> > + * Preferred language code
> > + * Returns: Type: Integer
> > + * Function Return Code
> > + * 3: Not implemented
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(6)));
> > + {
> > + /* 3 = not implemented */
> > + aml_append(ifctx2, aml_return(aml_int(3)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.1: 2.1.7 Submit TPM Operation Request to
> > + * Pre-OS Environment 2
> > + *
> > + * Arg 2 (Integer): Function Index = 7
> > + * Arg 3 (Package): Arguments = Package: Type: Integer
> > + * Integer 1: Operation Value of the Request
> > + * Integer 2: Argument for Operation
> > (optional)
> > + * Returns: Type: Integer
> > + * 0: Success
> > + * 1: Not Implemented
> > + * 2: General Failure
> > + * 3: Operation blocked by current firmware settings
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(7)));
> > + {
> > + /* get opcode */
> > + aml_append(ifctx2,
> > aml_store(aml_derefof(aml_index(arguments,
> > + zero)),
> > + op));
> > +
> > + /* get opcode flags */
> > + aml_append(ifctx2, aml_store(aml_call1("TPFN", op),
> > + op_flags));
> > + /* if func[opcode] & TPM_PPI_FUNC_NOT_IMPLEMENTED */
> > + ifctx3 = aml_if(
> > + aml_equal(
> > + aml_and(op_flags, func_mask, NULL),
> > + not_implemented));
> > + {
> > + /* 1: not implemented */
> > + aml_append(ifctx3, aml_return(one));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + /* if func[opcode] & TPM_PPI_FUNC_BLOCKED */
> > + ifctx3 = aml_if(
> > + aml_equal(
> > + aml_and(op_flags, func_mask, NULL),
> > + aml_int(TPM_PPI_FUNC_BLOCKED)));
> > + {
> > + /* 3: blocked by firmware */
> > + aml_append(ifctx3, aml_return(aml_int(3)));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + /* revision to integer */
> > + ifctx3 = aml_if(aml_equal(rev, one));
> > + {
> > + /* revision 1 */
> > + /* PPRQ = op */
> > + aml_append(ifctx3, aml_store(op, pprq));
> > + /* no argument, PPRM = 0 */
> > + aml_append(ifctx3, aml_store(zero, pprm));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + ifctx3 = aml_if(aml_equal(rev, aml_int(2)));
> > + {
> > + /* revision 2 */
> > + /* PPRQ = op */
> > + op_arg = aml_derefof(aml_index(arguments, one));
> > + aml_append(ifctx3, aml_store(op, pprq));
> > + /* PPRM = arg3[1] */
> > + aml_append(ifctx3, aml_store(op_arg, pprm));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > + /* 0: success */
> > + aml_append(ifctx2, aml_return(zero));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /*
> > + * PPI 1.1: 2.1.8 Get User Confirmation Status for Operation
> > + *
> > + * Arg 2 (Integer): Function Index = 8
> > + * Arg 3 (Package): Arguments = Package: Type: Integer
> > + * Operation Value that may need user
> > confirmation
> > + * Returns: Type: Integer
> > + * 0: Not implemented
> > + * 1: Firmware only
> > + * 2: Blocked for OS by firmware configuration
> > + * 3: Allowed and physically present user required
> > + * 4: Allowed and physically present user not required
> > + */
> > + ifctx2 = aml_if(aml_equal(function, aml_int(8)));
> > + {
> > + /* get opcode */
> > + aml_append(ifctx2,
> > + aml_store(aml_derefof(aml_index(arguments,
> > + zero)),
> > + op));
> > +
> > + /* get opcode flags */
> > + aml_append(ifctx2, aml_store(aml_call1("TPFN", op),
> > + op_flags));
> > + /* return confirmation status code */
> > + aml_append(ifctx2,
> > + aml_return(
> > + aml_and(op_flags, func_mask, NULL)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + aml_append(ifctx, aml_return(aml_buffer(1, zerobyte)));
> > + }
> > + aml_append(method, ifctx);
> > + }
> > + aml_append(dev, method);
> > +}
> > +
> > static void
> > build_dsdt(GArray *table_data, BIOSLinker *linker,
> > AcpiPmInfo *pm, AcpiMiscInfo *misc,
> > @@ -1802,6 +2183,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > uint32_t nr_mem = machine->ram_slots;
> > int root_bus_limit = 0xFF;
> > PCIBus *bus = NULL;
> > + TPMIf *tpm = tpm_find();
> > int i;
> >
> > dsdt = init_aml_allocator();
> > @@ -2139,7 +2521,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > /* Scan all PCI buses. Generate tables to support hotplug. */
> > build_append_pci_bus_devices(scope, bus, pm->pcihp_bridge_en);
> >
> > - if (TPM_IS_TIS(tpm_find())) {
> > + if (TPM_IS_TIS(tpm)) {
> > dev = aml_device("ISA.TPM");
> > aml_append(dev, aml_name_decl("_HID",
> > aml_eisaid("PNP0C31")));
> > aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
> > @@ -2153,6 +2535,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > */
> > /* aml_append(crs, aml_irq_no_flags(TPM_TIS_IRQ)); */
> > aml_append(dev, aml_name_decl("_CRS", crs));
> > +
> > + build_tpm_ppi(tpm, dev);
> > +
> > aml_append(scope, dev);
> > }
> >
> > @@ -2160,7 +2545,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > }
> > }
> >
> > - if (TPM_IS_CRB(tpm_find())) {
> > + if (TPM_IS_CRB(tpm)) {
> > dev = aml_device("TPM");
> > aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
> > crs = aml_resource_template();
> > @@ -2172,6 +2557,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > aml_append(method, aml_return(aml_int(0x0f)));
> > aml_append(dev, method);
> >
> > + build_tpm_ppi(tpm, dev);
> > +
> > aml_append(sb_scope, dev);
> > }
> >
> > @@ -2924,7 +3311,7 @@ void acpi_setup(void)
> > tpm_config = (FWCfgTPMConfig) {
> > .tpmppi_address = cpu_to_le32(TPM_PPI_ADDR_BASE),
> > .tpm_version = tpm_get_version(tpm_find()),
> > - .tpmppi_version = TPM_PPI_VERSION_NONE
> > + .tpmppi_version = TPM_PPI_VERSION_1_30
> > };
> > fw_cfg_add_file(pcms->fw_cfg, "etc/tpm/config",
> > &tpm_config, sizeof tpm_config);
> > diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt
> > index a5bdd5f26e..332c2ae597 100644
> > --- a/docs/specs/tpm.txt
> > +++ b/docs/specs/tpm.txt
> > @@ -62,6 +62,89 @@ URL:
> >
> > https://trustedcomputinggroup.org/tcg-acpi-specification/
> >
> > +== ACPI PPI Interface ==
> > +
> > +QEMU supports the Physical Presence Interface (PPI) for TPM 1.2 and TPM 2.
> > This
> > +interface requires ACPI and firmware support. The specification can be
> > found at
> > +the following URL:
> > +
> > +https://trustedcomputinggroup.org/resource/tcg-physical-presence-interface-specification/
> > +
> > +PPI enables a system administrator (root) to request a modification to the
> > +TPM upon reboot. The PPI specification defines the operation requests and
> > the
> > +actions the firmware has to take. The system administrator passes the
> > operation
> > +request number to the firmware through an ACPI interface which writes this
> > +number to a memory location that the firmware knows. Upon reboot, the
> > firmware
> > +finds the number and sends commands to the the TPM. The firmware writes
> > the TPM
> > +result code and the operation request number to a memory location that
> > ACPI can
> > +read from and pass the result on to the administrator.
> > +
> > +The PPI specification defines a set of mandatory and optional operations
> > for
> > +the firmware to implement. The ACPI interface also allows an administrator
> > to
> > +list the supported operations. In QEMU the ACPI code is generated by QEMU,
> > yet
> > +the firmware needs to implement support on a per-operations basis, and
> > +different firmwares may support a different subset. Therefore, QEMU
> > introduces
> > +the virtual memory device for PPI where the firmware can indicate which
> > +operations it supports and ACPI can enable the ones that are supported and
> > +disable all others. This interface lies in main memory and has the
> > following
> > +layout:
> > +
> > + +----------+--------+--------+-------------------------------------------+
> > + | Field | Length | Offset | Description |
> > + +----------+--------+--------+-------------------------------------------+
> > + | func | 0x100 | 0x000 | Firmware sets values for each supported |
> > + | | | | operation. See defined values below. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | ppin | 0x1 | 0x100 | SMI interrupt to use. Set by firmware. |
> > + | | | | Not supported. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | ppip | 0x4 | 0x101 | ACPI function index to pass to SMM code. |
> > + | | | | Set by ACPI. Not supported. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | pprp | 0x4 | 0x105 | Result of last executed operation. Set by |
> > + | | | | firmware. See function index 5 for values.|
> > + +----------+--------+--------+-------------------------------------------+
> > + | pprq | 0x4 | 0x109 | Operation request number to execute. See |
> > + | | | | 'Physical Presence Interface Operation |
> > + | | | | Summary' tables in specs. Set by ACPI. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | pprm | 0x4 | 0x10d | Operation request optional parameter. |
> > + | | | | Values depend on operation. Set by ACPI. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | lppr | 0x4 | 0x111 | Last executed operation request number. |
> > + | | | | Copied from pprq field by firmware. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | fret | 0x4 | 0x115 | Result code from SMM function. |
> > + | | | | Not supported. |
> > + +----------+--------+--------+-------------------------------------------+
> > + | res1 | 0x40 | 0x119 | Reserved for future use |
> > + +----------+--------+--------+-------------------------------------------+
> > + | next_step| 0x1 | 0x159 | Operation to execute after reboot by |
> > + | | | | firmware. Used by firmware. |
> > + +----------+--------+--------+-------------------------------------------+
> > +
> > + The following values are supported for the 'func' field. They correspond
> > + to the values used by ACPI function index 8.
> > +
> > + +----------+-------------------------------------------------------------+
> > + | value | Description |
> > + +----------+-------------------------------------------------------------+
> > + | 0 | Operation is not implemented. |
> > + +----------+-------------------------------------------------------------+
> > + | 1 | Operation is only accessible through firmware. |
> > + +----------+-------------------------------------------------------------+
> > + | 2 | Operation is blocked for OS by firmware configuration. |
> > + +----------+-------------------------------------------------------------+
> > + | 3 | Operation is allowed and physically present user required. |
> > + +----------+-------------------------------------------------------------+
> > + | 4 | Operation is allowed and physically present user is not |
> > + | | required. |
> > + +----------+-------------------------------------------------------------+
> > +
> > +The location of the table is given by the fw_cfg tpmppi_address field.
> > +The PPI memory region size is 0x400 (TPM_PPI_ADDR_SIZE) to leave
> > +enough room for future updates.
> > +
> >
> > QEMU files related to TPM ACPI tables:
> > - hw/i386/acpi-build.c
> >
>
--
Marc-André Lureau