opensbi.git/lib/sbi/sbi_ecall_replace.c, branch v0.9

lib: sbi: Allow custom local TLB flush function

2021-01-07T04:23:19Z

Currently, we have fixed TLB flush types supported by the remote TLB library. This approach is not flexible and does not allow custom local TLB flush function. For example, after updating PMP entries on a set of HARTs at runtime, we have to flush TLB on these HARTs as well. To support custom local TLB flush function, we replace the "type" field of "struct sbi_tlb_info" with a local TLB flush function pointer. We also provide definitions of standard TLB flush operations (such as fence_i, sfence.vma, hfence.vvma, hfence.gvma, etc). Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Replace args with trap registers in ecall handler

2021-01-07T04:23:14Z

We had added args pointer in ecall handler to ensure that ecall handler only implements functionality and does not deal with SBI calling convention. This also helped us to keep SBI calling convention related code in one place at sbi_ecall_handler(). The Keystone Enclavce project needs access to the trap regsiters in their ecall handler so that they can context switch enclaves in custom SBI calls. To help the Keystone Enclave project, we replace the args pointer in ecall handler parameter with a const pointer to trap registers. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Implement System Reset (SRST) SBI extension

2020-12-01T11:41:11Z

The SBI SRST extension has been accepted and merged in the latest SBI v0.3-draft specification. (Refer, https://github.com/riscv/riscv-sbi-doc) It allows to S-mode software to request system shutdown, cold reboot, and warm reboot. This patch implements SBI SRST extension as a replacement of the legacy sbi_shutdown() call of SBI v0.1 specification. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi_tlb: Fix remote TLB HFENCE VVMA implementation

2020-05-07T03:25:38Z

The HFENCE VVMA instructions flushes TLB based on the VMID present in HGATP CSR. To handle this, we get the current VMID for SBI HFENCE VVMA call and we use this current VMID to do remote TLB HFENCE VVMA on desired set of HARTs. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: sbi_timer: Remove scratch parameter from most funcitons

2020-03-28T08:02:55Z

This patch removes scratch parameter from most sbi_timer functions. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: sbi_ipi: Remove scratch parameter from most functions

2020-03-28T08:02:47Z

This patch removes scratch parameter from most sbi_ipi functions. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: sbi_tlb: Remove scratch parameter from sbi_tlb_request()

2020-03-28T08:02:44Z

The sbi_ipi_send_many() should get current HART scratch pointer on it's own using eventually hence removing scratch parameter from sbi_tlb_request(). Signed-off-by: Anup Patel

lib: sbi_ecall: Remove mcause, scratch and hartid parameters

2020-03-28T08:02:20Z

We remove mcause, scratch and hartid parameters from various functions for ecall handling because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: Make sbi_current_hartid() as macro in riscv_asm.h

2020-03-13T06:52:02Z

The sbi_current_hartid() being a regular function is quite expensive because for callers it is a function call instead of a direct CSR read. This patch converts sbi_current_hartid() into a macro in riscv_asm.h. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: Introduce SBI_TLB_INFO_INIT() helper macro

2020-03-11T09:59:55Z

We introduce SBI_TLB_INFO_INIT() helper macro to help easy initialization of struct sbi_tlb_info which is passed to the sbi_tlb_request() API. Signed-off-by: Anup Patel Reviewed-by: Bin Meng Reviewed-by: Atish Patra