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path: root/lib/sbi/sbi_trap.c
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2021-04-01firware: optimize the exception exit codeXiang W1-2/+3
There are two copies of the same abnormal exit code, this patch deletes one Signed-off-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2021-01-07lib: sbi: Introduce sbi_trap_exit() APIAnup Patel1-0/+20
We introduce sbi_trap_exit() API which can help non-firmware (i.e. generic or platform) code to force exit trap/interrupt handling and resume execution at context pointed by parameter "const struct sbi_trap_regs *regs". This new sbi_trap_exit() API will help Keystone Enclave project to resume execution of enclave from custom SBI call handler. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-09lib: sbi_trap: Allow M-mode to M-mode ECALLsAnup Patel1-0/+1
We should allow M-mode to M-mode ECALLs because: 1. No other mode can handle M-mode ECALLs 2. In future, we can allow M-mode baremetal application (not linked to OpenSBI) running independently and cooperatively without corrupting OpenSBI M-mode state (CSRs and memory). Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-09include: Rename ECALL defines to match latest RISC-V specAnup Patel1-1/+1
We rename CAUSE_HYPERVISOR_ECALL to CAUSE_SUPERVISOR_ECALL and CAUSE_SUPERVISOR_ECALL to CAUSE_VIRTUAL_SUPERVISOR_ECALL so that it matches latest RISC-V privilege spec. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-09lib: sbi: Don't handle VS-mode ecall in sbi_trap_handler()Anup Patel1-1/+0
The VS-mode ecall is supposed to be handled by HS-mode so sbi_trap_handler() should fallback to default case for VS-mode ecall trap. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-08-17lib: sbi_trap: Fix hstatus.SPVP update in sbi_trap_redirect()Georg Kotheimer1-1/+1
When redirecting from VS/VU-mode to HS-mode, hstatus.SPVP was set to the value of mstatus.SPP, as according to the specification both flags should be set to the same value. However, the assignment of SPVP takes place before SPP itself is updated, which results in SPVP having an outdated value. Signed-off-by: Georg Kotheimer <georg.kotheimer@tu-dresden.de> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-06-08lib: Add RISC-V hypervisor v0.6.1 supportAnup Patel1-5/+3
To support RISC-V hypervisor v0.6.1, we: 1. Don't need to explicitly forward WFI traps from VS/VU-mode 2. Have to delegate virtual instruction trap to HS-mode 3. Have to update trap redirection for changes in HSTATUS CSR Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: sbi_timer: Remove scratch parameter from most funcitonsAnup Patel1-2/+1
This patch removes scratch parameter from most sbi_timer functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: sbi_ipi: Remove scratch parameter from most functionsAnup Patel1-1/+1
This patch removes scratch parameter from most sbi_ipi functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_trap: Simplify sbi_trap_handler() APIAnup Patel1-11/+9
This patch simplify sbi_trap_handler() API as follows: 1. Remove current hartid local variable because sbi_trap_handler() itself does not need it. 2. Remove scratch parameter because none of the functions directly called by sbi_trap_handler() require it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_ecall: Remove mcause, scratch and hartid parametersAnup Patel1-1/+1
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 <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_misaligned_ldst: Remove mcause, scratch and hartid parametersAnup Patel1-6/+2
We remove mcause, scratch and hartid parameters from various functions for misaligned load/store handling because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_illegal_insn: Remove mcause, scratch and hartid parametersAnup Patel1-2/+1
We remove mcause, scratch and hartid parameters from various functions for illegal instruction handling because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_trap: Remove scratch parameter from sbi_trap_redirect()Anup Patel1-4/+2
The scratch parameter of sbi_trap_redirect() is not used hence we remove it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: Optimize unpriv load/store implementationAnup Patel1-24/+1
This patch optimize unpriv load/store implementation by having dedicated unpriv trap handler (just like KVM RISC-V). As a result of this optimization: 1. We have reduced roughly 13+ instruction in all unpriv load/store functions. The reduced instruction also include two function calls. 2. Per-HART trap info pointer in scratch space is now redundant hence removed. 3. The sbi_trap_handler() is now much cleaner because we don't have to handle unpriv load/store traps. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-13include: Make sbi_current_hartid() as macro in riscv_asm.hAnup Patel1-1/+1
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 <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-10lib: sbi: Fix coding style issuesBin Meng1-1/+1
This fixes various coding style issues found in the SBI codes. No functional changes. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2019-12-16lib: Extend trap redirection for hypervisor v0.5 specAnup Patel1-19/+37
The hypervisor v0.5 spec introduces two new CSRs for both M-mode and HS-mode which need to be considered when redirecting traps hence this patch. Signed-off-by: Anup Patel <anup.patel@wdc.com>
2019-11-21lib: Better naming of unpriv APIs for wider useAnup Patel1-19/+23
The unpriv APIs can be useful to external firmware and out-of-tree platform support code. This patch adds "sbi_" prefix to unpriv load/store APIs and rename struct riscv_unpriv to struct sbi_trap_info everywhere. We also place struct sbi_trap_info in sbi/sbi_trap.h so that we can use it for sbi_trap_redirect() as well. Overall, this patch will make naming of unpriv APIs consistent with other OpenSBI APIs. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2019-11-21include: Remove ilen member of struct unpriv_trapAnup Patel1-1/+1
We simplify struct unpriv_trap by removing ilen member. This can be achieved by ensuring that at all unpriv load/store instructions are 4 bytes long using GCC assembler option. Additionally, this also reduces few instructions from unpriv load/store functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2019-09-30lib: Extend sbi_trap_redirect() for hypervisor extensionAnup Patel1-23/+102
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 <atish.patra@wdc.com> Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2019-06-19lib: Move sbi core library to lib/sbiAtish Patra1-0/+207
Signed-off-by: Atish Patra <atish.patra@wdc.com> Acked-by: Anup Patel <anup.patel@wdc.com>
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