diff options
| author | Bryan O'Donoghue | 2018-01-26 16:27:14 +0000 |
|---|---|---|
| committer | Stefano Babic | 2018-02-04 12:14:11 +0100 |
| commit | 22191ac353445ad8fafc5a78aefcd94e78963041 (patch) | |
| tree | 4dc34071f833890834a26bd4ba2b056be9c51932 /drivers/crypto/fsl/jr.h | |
| parent | a1ffd9e2e634b5d573210d8ae0081d325f919c6d (diff) | |
drivers/crypto/fsl: assign job-rings to non-TrustZone
After enabling TrustZone various parts of the CAAM silicon become
inaccessible to non TrustZone contexts. The job-ring registers are designed
to allow non TrustZone contexts like Linux to still submit jobs to CAAM
even after TrustZone has been enabled.
The default job-ring permissions after the BootROM look like this for
job-ring zero.
ms=0x00008001 ls=0x00008001
The MS field is JRaMIDR_MS (job ring MID most significant).
Referring to "Security Reference Manual for i.MX 7Dual and 7Solo
Applications Processors, Rev. 0, 03/2017" section 8.10.4 we see that
JROWN_NS controls whether or not a job-ring is accessible from non
TrustZone.
Bit 15 (TrustZone) is the logical inverse of bit 3 hence the above value of
0x8001 shows that JROWN_NS=0 and TrustZone=1.
Clearly then as soon as TrustZone becomes active the job-ring registers are
no longer accessible from Linux, which is not what we want.
This patch explicitly sets all job-ring registers to JROWN_NS=1 (non
TrustZone) by default and to the Non-Secure MID 001. Both settings are
required to successfully assign a job-ring to non-secure mode. If a piece
of TrustZone firmware requires ownership of job-ring registers it can unset
the JROWN_NS bit itself.
This patch in conjunction with a modification of the Linux kernel to skip
HWRNG initialisation makes CAAM usable to Linux with TrustZone enabled.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Alex Porosanu <alexandru.porosanu@nxp.com>
Cc: Ruchika Gupta <ruchika.gupta@nxp.com>
Cc: Aneesh Bansal <aneesh.bansal@nxp.com>
Link: https://github.com/OP-TEE/optee_os/issues/1408
Link: https://tinyurl.com/yam5gv9a
Tested-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Diffstat (limited to 'drivers/crypto/fsl/jr.h')
| -rw-r--r-- | drivers/crypto/fsl/jr.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/crypto/fsl/jr.h b/drivers/crypto/fsl/jr.h index d897e572d6e..8aab4c988da 100644 --- a/drivers/crypto/fsl/jr.h +++ b/drivers/crypto/fsl/jr.h @@ -34,6 +34,8 @@ #define JRNSLIODN_MASK 0x0fff0000 #define JRSLIODN_SHIFT 0 #define JRSLIODN_MASK 0x00000fff +#define JROWN_NS 0x00000008 +#define JRMID_NS 0x00000001 #define JQ_DEQ_ERR -1 #define JQ_DEQ_TO_ERR -2 |