diff options
| -rw-r--r-- | src/arch/riscv/include/vm.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/arch/riscv/include/vm.h b/src/arch/riscv/include/vm.h index a65aba9db8..dadfecd8b4 100644 --- a/src/arch/riscv/include/vm.h +++ b/src/arch/riscv/include/vm.h @@ -91,6 +91,17 @@ void flush_tlb(void); ); \ } +/* + * mprv_{read,write}_* - Modified privilege memory access functions. + * + * These inline functions perform a read or write memory operation with the + * mstatus.MPRV bit set. This causes the memory protections and translation of + * the previous mode (e.g. U-mode, if we're handling a trap from U-mode) to be + * applied. + * + * The user of these functions must make sure to avoid trap loops through + * unaligned memory accesses. + */ DEFINE_MPRV_READ(mprv_read_u8, uint8_t, lbu) DEFINE_MPRV_READ(mprv_read_u16, uint16_t, lhu) DEFINE_MPRV_READ(mprv_read_u32, uint32_t, lwu) |