core: riscv: add build config for MPXY/RPMI support

Enable compilation of MPXY/RPMI support by introducing the build
option `CFG_RISCV_SBI_MPXY_RPMI`.

This commit:
- Adds sbi_mpxy_rpmi.c to the bui

core: riscv: add build config for MPXY/RPMI support

Enable compilation of MPXY/RPMI support by introducing the build
option `CFG_RISCV_SBI_MPXY_RPMI`.

This commit:
- Adds sbi_mpxy_rpmi.c to the build when the option is enabled
- Forces `CFG_RISCV_SBI_MPXY` when MPXY/RPMI is selected
- Enables CFG_RISCV_SBI_MPXY_RPMI in plat-virt by default

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>

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core: riscv: introduce CFG_RISCV_SBI_MPXY flag for MPXY SBI support

Add a new build-time configuration flag CFG_RISCV_SBI_MPXY to enable
compilation of MPXY SBI extension support in OP-TEE. When ena

core: riscv: introduce CFG_RISCV_SBI_MPXY flag for MPXY SBI support

Add a new build-time configuration flag CFG_RISCV_SBI_MPXY to enable
compilation of MPXY SBI extension support in OP-TEE. When enabled, this
automatically forces CFG_RISCV_SBI to ensure the SBI infrastructure is
included.

Also update the build system to conditionally compile sbi_mpxy.c based
on this flag.

Enable CFG_RISCV_SBI_MPXY by default for the virt platform.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>

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core: riscv: Add seed CSR detection helper

Any attempted access to unimplemented or restricted CSRs will
raise an illegal instruction, so we can set up a temporary
trap handler to validate if the us

core: riscv: Add seed CSR detection helper

Any attempted access to unimplemented or restricted CSRs will
raise an illegal instruction, so we can set up a temporary
trap handler to validate if the use of CSRs is allowed in
the privileged mode where OP-TEE OS is running. Add a helper
for this specific purpose.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: Add semihosting.S for semihosting instructions

RISC-V architecture has defined the semihosting binary interface, which
consists of a special trap instruction sequence, in:
https://githu

core: riscv: Add semihosting.S for semihosting instructions

RISC-V architecture has defined the semihosting binary interface, which
consists of a special trap instruction sequence, in:
https://github.com/riscv-non-isa/riscv-semihosting

Add semihosting.S into RISC-V kernel folder to implement the trap
instruction sequence.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: add thread_optee_abi.c

This commit just copies thread_optee_smc.c from ARM and renames
smc/SMC to abi/ABI.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alv

core: riscv: add thread_optee_abi.c

This commit just copies thread_optee_smc.c from ARM and renames
smc/SMC to abi/ABI.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Tested-by: Alvin Chang <alvinga@andestech.com>

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core: riscv: move TEE ABI handlers from thread_rv.S to thread_optee_abi_rv.S

This commits moves the following functions from thread_rv.S to a separate
file thread_optee_abi_rv.S:

- thread_return_fr

core: riscv: move TEE ABI handlers from thread_rv.S to thread_optee_abi_rv.S

This commits moves the following functions from thread_rv.S to a separate
file thread_optee_abi_rv.S:

- thread_return_from_nsec_call()
- thread_std_smc_entry() -> renamed to thread_std_abi_entry()
- thread_rpc()

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Tested-by: Alvin Chang <alvinga@andestech.com>

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core: riscv: Add cflags for excluding source files from ftrace

Some C source files may lead to incorrect behaviors in ftrace. Exclude
them when the system is compiled with ftrace support.

Signed-of

core: riscv: Add cflags for excluding source files from ftrace

Some C source files may lead to incorrect behaviors in ftrace. Exclude
them when the system is compiled with ftrace support.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Marouene Boubakri <marouene.boubakri@nxp.com>

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core: riscv: Implement function to print kernel stack

Implement the function to print the kernel stack. The code is referenced
from ARM architecture.

Signed-off-by: Alvin Chang <alvinga@andestech.c

core: riscv: Implement function to print kernel stack

Implement the function to print the kernel stack. The code is referenced
from ARM architecture.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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core: riscv: provide cache_helpers_rv.S

Simple implementation of instruction cache and data cache operations
that relies on RISC-V's fence and fence.i instructions.

Signed-off-by: Marouene Boubakri

core: riscv: provide cache_helpers_rv.S

Simple implementation of instruction cache and data cache operations
that relies on RISC-V's fence and fence.i instructions.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: provide arch_scall_rv.S

Provide an implementation of scall_do_call(), syscall_sys_return()
and syscall_panic().

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: J

core: riscv: provide arch_scall_rv.S

Provide an implementation of scall_do_call(), syscall_sys_return()
and syscall_panic().

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: arch_scall.c: implement scall_save_panic_stack()

Provide an implementation of scall_save_panic_stack() needed by
scall_sys_return_helper().

Signed-off-by: Marouene Boubakri <marouene.b

core: riscv: arch_scall.c: implement scall_save_panic_stack()

Provide an implementation of scall_save_panic_stack() needed by
scall_sys_return_helper().

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: implement thread management routines in thread_arch.c

This commit implements an initial thread management for RISC-V. It covers
the following routines:

- Exceptions un/masking
- Trap h

core: riscv: implement thread management routines in thread_arch.c

This commit implements an initial thread management for RISC-V. It covers
the following routines:

- Exceptions un/masking
- Trap handling, including syscalls handling.
- Thread allocation, execution, suspension, freeing with slight changes
to set RISC-V registers such as CSRs.
- RPC.

Pending routines:
- Floatting point support F/D/Q/L extensions and software FP.
- Abort mode.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: provide abort.c

Initial implementation of abort handler for RISC-V.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

core: riscv: add thread manager assembly code in thread_rv.S

This commit implements:
- An entry point of trap handler in non-vectored mode.
- thread_unwind_user_mode() and thread_exit_user_mode()
to

core: riscv: add thread manager assembly code in thread_rv.S

This commit implements:
- An entry point of trap handler in non-vectored mode.
- thread_unwind_user_mode() and thread_exit_user_mode()
to return from U-Mode.
- __thread_enter_user_mode() to jump to U-Mode from S-Mode or M-Mode.
- thread_std_smc_entry(), thread_resume() and thread_rpc().

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: asm-defines.c: create and populate with thread-related defines

Create core/arch/riscv/kernel/asm-defines.c and add defines for thread_ctx,
thread_core_local, thread_ctx_regs, thread_use

core: riscv: asm-defines.c: create and populate with thread-related defines

Create core/arch/riscv/kernel/asm-defines.c and add defines for thread_ctx,
thread_core_local, thread_ctx_regs, thread_user_mode_rec, thread_trap_regs
and thread_scall_regs.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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riscv: kernel: entry.S: provide entry script

Provide core's single entry point for RV32/RV64 in S/M Modes.
For now it performs: booting primary and secondary harts. Setting stack
pointer, thread poi

riscv: kernel: entry.S: provide entry script

Provide core's single entry point for RV32/RV64 in S/M Modes.
For now it performs: booting primary and secondary harts. Setting stack
pointer, thread pointer (to thread_core_local), supervisor address
translation and protection register, clearing BSS...etc and calls to
appropriate functions to initialize the MMU and continue to boot flow
from boot.c.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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riscv: kernel: implement boot flow in boot.c

Provide an implementation of init_tee_runtime(), plat_primary_init_early()
boot_init_primary_early(), boot_init_primary_late(), boot_init_secondary()
and

riscv: kernel: implement boot flow in boot.c

Provide an implementation of init_tee_runtime(), plat_primary_init_early()
boot_init_primary_early(), boot_init_primary_late(), boot_init_secondary()
and helper functions. For now init_sec_mon() is kept to be replaced later
by a routine to initialize SBI implementation (to for example, probe for
available SBI extensions).

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: riscv: add time source based on time registers

Implement a TEE time source based on CSR_TIME and CSR_HTIME for S-Mode
and CLINT MTIME register for M-Mode.
CFG_RISCV_TIME_SOURCE_RDTIME flag to

core: riscv: add time source based on time registers

Implement a TEE time source based on CSR_TIME and CSR_HTIME for S-Mode
and CLINT MTIME register for M-Mode.
CFG_RISCV_TIME_SOURCE_RDTIME flag to enable or not building the time
source. CFG_RISCV_MTIME_RATE defines the timer rate, default to 10MHz.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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riscv: kernel: add console driver for S-Mode using SBI

Implements a generic console driver using legacy SBI extension.
This introduces a flag CFG_RISCV_SBI_CONSOLE to decide building
the driver or n

riscv: kernel: add console driver for S-Mode using SBI

Implements a generic console driver using legacy SBI extension.
This introduces a flag CFG_RISCV_SBI_CONSOLE to decide building
the driver or not. This allows using another UART driver instead.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
[jf: set author to be same as Signed-off-by:]
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

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riscv: kernel: sbi: add RISC-V SBI interface

Allow OP-TEE core running in S-Mode (supervisor) to interface with
Supervisor Execution Environment (SEE) through environmental calls (ecall).
Adds CFG_R

riscv: kernel: sbi: add RISC-V SBI interface

Allow OP-TEE core running in S-Mode (supervisor) to interface with
Supervisor Execution Environment (SEE) through environmental calls (ecall).
Adds CFG_RISCV_SBI flag to enable or disable it.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
[jf: set author to be same as Signed-off-by:]
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

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riscv: kernel: add stub for tee_time_get_sys_time()

A stub implementation which returns TEE_ERROR_NOT_IMPLEMENTED for now.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jen

riscv: kernel: add stub for tee_time_get_sys_time()

A stub implementation which returns TEE_ERROR_NOT_IMPLEMENTED for now.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

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riscv: kernel: idle.c: implement cpu_idle()

Required by panic() to abort current execution. It ensures memory
operations were complete and stalls the hart.

Signed-off-by: Marouene Boubakri <marouen

riscv: kernel: idle.c: implement cpu_idle()

Required by panic() to abort current execution. It ensures memory
operations were complete and stalls the hart.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: riscv: spinlock.c: implement spin-locking primitives

Implement __cpu_spin_lock(), __cpu_spin_unlock() and __cpu_spin_trylock()
Use atomic-instruction amoswap in "A" extension for locks and ens

core: riscv: spinlock.c: implement spin-locking primitives

Implement __cpu_spin_lock(), __cpu_spin_unlock() and __cpu_spin_trylock()
Use atomic-instruction amoswap in "A" extension for locks and ensure memory
ordering using fence instruction.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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riscv: create makefiles and directories tree for riscv

This commits creates the very first makefiles, directories and
subdirectories for RISC-V port. It also creates a new platform flavor
named plat

riscv: create makefiles and directories tree for riscv

This commits creates the very first makefiles, directories and
subdirectories for RISC-V port. It also creates a new platform flavor
named plat-spike. Spike is a reference functional RISC-V ISA simulator
which provides full system emulation and it is developed alongside the
RISC-V toolchain.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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