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zephyr/arch/riscv/core/pmp/Kconfig

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arch: riscv: add pmp support - Set some helper function to write/clear/print PMP config registers. - Add support for different PMP slot size function to core/board. Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
2020-07-21 21:59:23 +08:00
# Physical Memory Protection (PMP) configuration options
# Copyright (c) 2020 BayLibre, SAS
# SPDX-License-Identifier: Apache-2.0
config PMP_SLOT
int "Number of PMP slot"
default 8
help
Depend of the arch/board. Take care to don't put value higher
than the Hardware allow you.
arch: riscv: add memory protection support The IRQ handler has had a major changes to manage syscall, reschedule and interrupt from user thread and stack guard. Add userspace support: - Use a global variable to know if the current execution is user or machine. The location of this variable is read only for all user thread and read/write for kernel thread. - Memory shared is supported. - Use dynamic allocation to optimize PMP slot usage. If the area size is a power of 2, only one PMP slot is used, else 2 are used. Add stack guard support: - Use MPRV bit to force PMP rules to machine mode execution. - IRQ stack have a locked stack guard to avoid re-write PMP configuration registers for each interruption and then win some cycle. - The IRQ stack is used as "temporary" stack at the beginning of IRQ handler to save current ESF. That avoid to trigger write fault on thread stack during store ESF which that call IRQ handler to infinity. - A stack guard is also setup for privileged stack of a user thread. Thread: - A PMP setup is specific to each thread. PMP setup are saved in each thread structure to improve reschedule performance. Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com> Reviewed-by: Nicolas Royer <nroyer@baylibre.com>
2020-07-21 22:00:39 +08:00
config PMP_POWER_OF_TWO_ALIGNMENT
bool "Enable power of two alignment"
default n
select MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT
select GEN_PRIV_STACKS
help
This option will reduce the PMP slot number usage but increase
the memory consumption.
config PMP_STACK_GUARD
bool "Thread Stack Guard"
default n
help
Enable Thread Stack Guards via PMP
if PMP_STACK_GUARD
config PMP_STACK_GUARD_MIN_SIZE
int "Guard size"
default 16
help
Minimum size (and alignment when applicable) of an stack guard
region, which guards the stack of a thread. The width of the
arch: riscv: Update the description of CONFIG_PMP_STACK_GUARD_MIN_SIZE Update the uints in bytes instead of words in its description. It can avoid confusion. Signed-off-by: Shih-Wei Teng <swteng@andestech.com>
2021-02-23 15:37:22 +08:00
guard is set to 16 bytes, to accommodate the riscv
granularity.
arch: riscv: add memory protection support The IRQ handler has had a major changes to manage syscall, reschedule and interrupt from user thread and stack guard. Add userspace support: - Use a global variable to know if the current execution is user or machine. The location of this variable is read only for all user thread and read/write for kernel thread. - Memory shared is supported. - Use dynamic allocation to optimize PMP slot usage. If the area size is a power of 2, only one PMP slot is used, else 2 are used. Add stack guard support: - Use MPRV bit to force PMP rules to machine mode execution. - IRQ stack have a locked stack guard to avoid re-write PMP configuration registers for each interruption and then win some cycle. - The IRQ stack is used as "temporary" stack at the beginning of IRQ handler to save current ESF. That avoid to trigger write fault on thread stack during store ESF which that call IRQ handler to infinity. - A stack guard is also setup for privileged stack of a user thread. Thread: - A PMP setup is specific to each thread. PMP setup are saved in each thread structure to improve reschedule performance. Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com> Reviewed-by: Nicolas Royer <nroyer@baylibre.com>
2020-07-21 22:00:39 +08:00
endif # PMP_STACK_GUARD