opensbi.git/lib, branch v0.5

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: 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

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

include: Extend get_insn() to read instruction from VS/VU mode

2019-09-30T10:05:43Z

Current implementation of get_insn() is not suitable for reading instruction from VS/VU mode because we have to set SSTATUS_MXR bit in VSSTATUS CSR for reading instruction from VS/VU mode. This patch extends get_insn() to read instruction from VS/VU mode. Signed-off-by: Anup Patel Signed-off-by: Alistair Francis

lib: Redirect WFI trapped from VS/VU mode to HS-mode

2019-09-30T10:02:00Z

The WFI will trap as illegal instruction trap when executed in VS/VU mode so we just forward/redirect it to HS-mode so that hypervisor can deal with it appropriately. Signed-off-by: Anup Patel

lib: Extend sbi_trap_redirect() for hypervisor extension

2019-09-30T09:59:37Z

When hypervisor extension is available, we can get traps from VS/VU modes. We should be able to force redirect some of these traps to HS-mode. In other words, we should be able forward traps from VS/VU mode to HS-mode using sbi_trap_redirect() hence this patch. Signed-off-by: Atish Patra Signed-off-by: Anup Patel Signed-off-by: Alistair Francis

lib: Extend sbi_hart_switch_mode() to support hypervisor extension

2019-09-30T09:48:06Z

This patch extends sbi_hart_switch_mode() to support entering VS/VU modes when hypervisor extension is available. Signed-off-by: Anup Patel