Hi
On Thu, Jun 21, 2018 at 4:23 PM, Igor Mammedov <address@hidden> wrote:
On Thu, 21 Jun 2018 15:21:02 +0200
Marc-André Lureau <address@hidden> wrote:
Hi
On Thu, Jun 21, 2018 at 2:54 PM, Igor Mammedov <address@hidden> wrote:
On Tue, 15 May 2018 14:14:32 +0200
Marc-André Lureau <address@hidden> 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>
---
v4 (Marc-André):
- replace 'DerefOf (FUNC [N])' with a function, to fix Windows ACPI
handling.
- replace 'return Package (..) {} ' with scoped variables, to fix
Windows ACPI handling.
v3:
- add support for PPI to CRB
- split up OperationRegion TPPI into two parts, one containing
the registers (TPP1) and the other one the flags (TPP2); switched
the order of the flags versus registers in the code
- adapted ACPI code to small changes to the array of flags where
previous flag 0 was removed and now shifting right wasn't always
necessary anymore
v2:
- get rid of FAIL variable; function 5 was using it and always
returns 0; the value is related to the ACPI function call not
a possible failure of the TPM function call.
- extend shared memory data structure with per-opcode entries
holding flags and use those flags to determine what to return
to caller
- implement interface version 1.3
---
include/hw/acpi/tpm.h | 21 +++
hw/i386/acpi-build.c | 294 +++++++++++++++++++++++++++++++++++++++++-
2 files changed, 314 insertions(+), 1 deletion(-)
diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
index f79d68a77a..fc53f08827 100644
--- a/include/hw/acpi/tpm.h
+++ b/include/hw/acpi/tpm.h
@@ -196,4 +196,25 @@ REG32(CRB_DATA_BUFFER, 0x80)
#define TPM_PPI_VERSION_NONE 0
#define TPM_PPI_VERSION_1_30 1
+struct tpm_ppi {
+ uint8_t func[256]; /* 0x000: per TPM function implementation flags;
+ set by BIOS */
+/* 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)
+ uint8_t ppin; /* 0x100 : set by BIOS */
+ uint32_t ppip; /* 0x101 : set by ACPI; not used */
+ uint32_t pprp; /* 0x105 : response from TPM; set by BIOS */
+ uint32_t pprq; /* 0x109 : opcode; set by ACPI */
+ uint32_t pprm; /* 0x10d : parameter for opcode; set by ACPI */
+ uint32_t lppr; /* 0x111 : last opcode; set by BIOS */
+ uint32_t fret; /* 0x115 : set by ACPI; not used */
+ uint8_t res1[0x40]; /* 0x119 : reserved for future use */
+ uint8_t next_step; /* 0x159 : next step after reboot; set by BIOS */
+} QEMU_PACKED;
is this structure plant to be used for accessing data from within QEMU
or it is just used for convenience of calculating offsets/sizes for AML?
For convenience (and it can be useful for debugging).
we are gradually getting rid of usage "struct foo" in ACPI code
(i.e. when I have time to convert old struct based approach
to build_append_int() table based format).
and for new code I usually require ACPI parts be struct less
(if there is no previous struct baggage to back it up).
The tpm_ppi struct is not an ACPI table, it's a fixed memory region /
layout to exchange between guest/os and firmware.
Hence my request to drop dummy struct and document layout
properly in related spec doc (that's where FW should look for
documentation and not into struct definition somewhere in
the header). So I'd strongly prefer it be done this way.
There is not much more than the field description for me ;). Stefan,
would you like to develop the structure usage?