Help¶

Enable low-level SOC-specific context management, for SOCs with extra state that must be saved when entering an interrupt/exception, and restored on exit. If unsure, leave this at the default value.

Enabling this option requires that the SoC provide a soc_context.h header which defines the following macros:

SOC_ESF_MEMBERS: structure component declarations to allocate space for. The last such declaration should not end in a semicolon, for portability. The generic RISC-V architecture code will allocate space for these members in a “struct soc_esf” type (typedefed to soc_esf_t), which will be available if arch.h is included.
SOC_ESF_INIT: structure contents initializer for struct soc_esf state. The last initialized member should not end in a comma.

The generic architecture IRQ wrapper will also call __soc_save_context and __soc_restore_context routines at ISR entry and exit, respectively. These should typically be implemented in assembly. If they were C functions, they would have these signatures:

void __soc_save_context(soc_esf_t *state);

void __soc_restore_context(soc_esf_t *state);

The calls obey standard calling conventions; i.e., the state pointer address is in a0, and ra contains the return address.

Direct dependencies¶

SOC_OPENISA_RV32M1_RISCV32 || RISCV

(Includes any dependencies from ifs and menus.)

Default¶

y if SOC_OPENISA_RV32M1_RI5CY

Symbols selected by this symbol¶

RISCV_SOC_OFFSETS

Kconfig definitions¶

At <Zephyr>/soc/riscv/openisa_rv32m1/Kconfig.defconfig:27

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:25 → <BuildDir>/Kconfig/Kconfig.soc.defconfig:1

Menu path: (Top)

config RISCV_SOC_CONTEXT_SAVE
    bool
    default y if SOC_OPENISA_RV32M1_RI5CY
    depends on SOC_OPENISA_RV32M1_RISCV32

At <Zephyr>/arch/riscv/Kconfig:41

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:29 → <Zephyr>/arch/Kconfig:12

Menu path: (Top) → RISCV Options → RISCV Processor Options

config RISCV_SOC_CONTEXT_SAVE
    bool "Enable SOC-based context saving in IRQ handlers"
    select RISCV_SOC_OFFSETS
    depends on RISCV
    help
      Enable low-level SOC-specific context management, for SOCs
      with extra state that must be saved when entering an
      interrupt/exception, and restored on exit. If unsure, leave
      this at the default value.

      Enabling this option requires that the SoC provide a
      soc_context.h header which defines the following macros:

      - SOC_ESF_MEMBERS: structure component declarations to
        allocate space for. The last such declaration should not
        end in a semicolon, for portability. The generic RISC-V
        architecture code will allocate space for these members in
        a "struct soc_esf" type (typedefed to soc_esf_t), which will
        be available if arch.h is included.

      - SOC_ESF_INIT: structure contents initializer for struct soc_esf
        state. The last initialized member should not end in a comma.

      The generic architecture IRQ wrapper will also call
      __soc_save_context and __soc_restore_context routines at
      ISR entry and exit, respectively. These should typically
      be implemented in assembly. If they were C functions, they
      would have these signatures:

      void __soc_save_context(soc_esf_t *state);

      void __soc_restore_context(soc_esf_t *state);

      The calls obey standard calling conventions; i.e., the state
      pointer address is in a0, and ra contains the return address.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)