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Add memory protection support to RISC-V port

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Related to #908

Add memory protection support to the RISC-V port.

* **Memory Protection Configurations and Settings**
  - Add memory protection-related configurations and settings in `portable/GCC/RISC-V/portmacro.h` and `portable/IAR/RISC-V/portmacro.h`.
  - Define macros for enabling and disabling memory protection in both files.

* **Critical Section Handling**
  - Update the `portENTER_CRITICAL` and `portEXIT_CRITICAL` macros in `portable/GCC/RISC-V/portmacro.h` and `portable/IAR/RISC-V/portmacro.h` to handle memory protection.

* **Chip-Specific Extensions**
  - Add memory protection-related definitions and macros in `portable/GCC/RISC-V/chip_specific_extensions/RISCV_MTIME_CLINT_no_extensions/freertos_risc_v_chip_specific_extensions.h` and `portable/IAR/RISC-V/chip_specific_extensions/RV32I_CLINT_no_extensions/freertos_risc_v_chip_specific_extensions.h`.
  - Define macros for saving and restoring memory protection context in both files.

* **Port Functions**
  - Add functions for enabling and disabling memory protection in `portable/GCC/RISC-V/port.c` and `portable/IAR/RISC-V/port.c`.

Working on still: portASM.s planning to implement ASAP
This commit is contained in:
Vishwanath Martur 2024-11-01 12:26:29 +05:30
parent 8225a7f554
commit 8e434c1385
6 changed files with 93 additions and 5 deletions
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27
portable/GCC/RISC-V/portmacro.h
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@ -197,6 +197,33 @@ extern size_t xCriticalNesting;
#error "configMTIME_BASE_ADDRESS and configMTIMECMP_BASE_ADDRESS must be defined in FreeRTOSConfig.h. Set them to zero if there is no MTIME (machine time) clock. See www.FreeRTOS.org/Using-FreeRTOS-on-RISC-V.html"
#endif /* if defined( configCLINT_BASE_ADDRESS ) && !defined( configMTIME_BASE_ADDRESS ) && ( configCLINT_BASE_ADDRESS == 0 ) */
/* Memory protection related configurations and settings */
#define portMPU_REGION_READ_WRITE 0x03
#define portMPU_REGION_READ_ONLY 0x06
#define portMPU_REGION_NO_ACCESS 0x00
/* Macros for enabling and disabling memory protection */
#define portENABLE_MEMORY_PROTECTION() __asm volatile ( "csrs mstatus, 0x10000" )
#define portDISABLE_MEMORY_PROTECTION() __asm volatile ( "csrc mstatus, 0x10000" )
/* Update the portENTER_CRITICAL and portEXIT_CRITICAL macros to handle memory protection */
#define portENTER_CRITICAL() \
{ \
portDISABLE_INTERRUPTS(); \
portDISABLE_MEMORY_PROTECTION(); \
xCriticalNesting++; \
}
#define portEXIT_CRITICAL() \
{ \
xCriticalNesting--; \
if( xCriticalNesting == 0 ) \
{ \
portENABLE_MEMORY_PROTECTION(); \
portENABLE_INTERRUPTS(); \
} \
}
/* *INDENT-OFF* */
#ifdef __cplusplus
}