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Boyan Karatotev
a873d26f2b
Currently, the configuration with BL1 and BL2 at SEL1 will transition via el3_exit which will restore per-world context. However, that context is never written to and so zeroes end up in registers, which is not necessarily correct. This patch gets BL1 to call cm_manage_extensions_per_world() whenever BL2 runs in a lower EL. This allows the per-world registers to have the reset values we intend. An accompanying call to cm_manage_extensions_el3() is also added for completeness. Doing this shows a small deficiency in cptr_el3 - bits TFP and TCPAC change a lot. This patch makes them consistent by always setting TCPAC and TFP to 0 which unconditionally enable access to CPTR_EL2 and FPCR by default as they are always accessible. Other places that manipulate the TFP bit are removed. A nice side effect of all of this is that we're now in a position to enable and use any architectural extension in BL2. Change-Id: I070d62bbf8e9d9b472caf7e2c931c303523be308 Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>