SSTC extension allows nuttx to implement S-mode timer directly,
which is useful for starting at S-mode.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
This patch adds more debug related CSR definitions
to arch/risc-v/include/csr.h.
These definitions are from the RISC-V Debug Specification
Version 1.0 rc1 (https://github.com/riscv/riscv-debug-spec).
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
add defintions for vector extension and additional user-mode
extension fields for MSTATUS and SSTATUS registers.
Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
- Add config "ARCH_USE_S_MODE" which controls whether the kernel
runs in M-mode or S-mode
- Add more MSTATUS and most of the SSTATUS register definitions
- Add more MIP flags for interrupt delegation
- Add handling of interrupts from S-mode
- Add handling of FPU from S-mode
- Add new context handling functions that are not dependent on the trap
handlers / ecall
NOTE: S-mode requires a companion SW (SBI) which is not yet implemented,
thus S-mode is not usable as is, yet.
- Add test for mode support, which is architecture dependent
- Add tests for address alignment and region size
- Add option to query for access rights
- The function goes through every PMP entry and tests if an address
range from [base, base+size] has been configured for desired
access rights.
- If several PMP entries match the range and access rights, the
information is combined
- End result is either no access, a partial match was found, or a full
match was found. Details about the partial match are not provided.
The intent for testing access rights and not just blindly applying them
is a case where they are already set in e.g. a bootloader. In this
case, nothing should be done, unless the configuration does not match,
in which case the software must not continue further.
Ken Pettit has submitted the ICLA and we can migrate the licenses
to Apache.
Sebastien Lorquet has submitted the ICLA and we can migrate the licenses
to Apache.
Gregory Nutt has submitted the SGA and we can migrate the licenses
to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Modify the default configuration in KConfig.
Sync latest commit from mainline.
Remove unused demo configuration
fixup bl602 nsh defconfig cause CICD failed
Rebase from mainline code
