opensbi.git, branch v0.5

include: Bump-up version to 0.5

2019-10-09T06:03:53Z

This patch updates OpenSBI version to 0.5 as part of release preparation. Signed-off-by: Anup Patel

lib: Provide a platform hook to implement vendor specific SBI extensions.

2019-10-03T03:28:51Z

SBI v0.2 specification allows vendor extensions and it should be implemented in a independent of the core sbi library. Introduce a single platform callback that will let platforms handle all vendor extensions in platform specific code if they want. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: Implement SBI v0.2

2019-10-03T03:26:55Z

SBI v0.2 introduces a base specification which is mandatory to implement for any SBI implementations that is not legacy. Add support for the base extension. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: Remove redundant variable assignment

2019-10-03T03:25:25Z

An ecall handler should only return error if valid SBI function fails. Otherwise, it should succeed with appropriate error in a0. Get rid of unnecessary setting of the temporary return variable to zero for the cases where errors are not expected. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: Rename existing SBI implementation as 0.1.

2019-10-03T03:23:52Z

Current SBI implementation is now considered as version 0.1 and will be removed/replaced with newer extension/functions in future. Rename the existing implementations accordingly to be in sync with the specification. Signed-off-by: Atish Patra Reviewed-by: Anup Patel Reviewed-by: Zong Li

lib: Align error codes as per SBI specification.

2019-10-03T03:22:54Z

Follow the SBI specification for error codes. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

Test: Move test payload related code out of interface header

2019-10-03T03:21:39Z

Test payload uses an SBI call and uses the macros defined in interface header which is not the correct place to have these definitions. The interface header file should be used to keep SBI specification related macros. Keep all the test payload related code in test itself. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: Fix coldboot race condition observed on emulators/simulators

2019-10-02T11:33:58Z

If we are running on RISC-V emulator/simulator with large number of HARTs where each HART is a regular thread under UNIX host then it is possible that some of the secondary HARTs don't get chance to run and sbi_hart_wake_coldboot_harts() is called before secondary HARTs call sbi_hart_wait_for_coldboot(). In this situation, some of the secondary HARTs will never come-out of coldboot wait loop. To tackle this, we introduce a global flag coldboot_done which will be protected by coldboot lock and it will be set by primary HART from sbi_hart_wake_coldboot_harts() before waking-up secondary HARTs. We also re-arrange acquire/release of coldboot lock to reduce further chances of race-condition. Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Zong Li Reviewed-by: Nylon Chen

Makefile: Minor fix in OPENSBI_VERSION_GIT

2019-10-02T11:33:54Z

Currently, if someone has forked OpenSBI repo quite sometime back and this fork is not having updated tags from upstream riscv/opensbi repo then "git describe" command can fail. To tackle this, we redirect error output of "git describe" to /dev/null. Signed-off-by: Anup Patel Reviewed-by: Bin Meng

lib: Emulate HTIMEDELTA CSR for platforms not having TIME CSR

2019-09-30T10:06:14Z

For platforms not having TIME CSR, we trap-n-emulate TIME CSR read/write in OpenSBI. Same rationale applies to HTIMEDELTA CSR as well so we trap-n-emulate HTIMEDELTA CSR for platforms not having TIME CSR. Signed-off-by: Anup Patel