/* SPDX-License-Identifier: BSD-4-Clause-UC */ #ifndef _VM_H #define _VM_H #include <string.h> #include <stdint.h> #include <arch/encoding.h> #define EXTRACT_FIELD(val, which) (((val) & (which)) / ((which) & ~((which)-1))) #define INSERT_FIELD(val, which, fieldval) (((val) & ~(which)) | ((fieldval) * ((which) & ~((which)-1)))) void mstatus_init(void); // need to setup mstatus so we know we have virtual memory #define DEFINE_MPRV_READ_FLAGS(name, type, insn, flags) \ static inline type name(type *p); \ static inline type name(type *p) \ { \ size_t mprv = flags; \ type value; \ asm ( \ "csrs mstatus, %1\n" \ STRINGIFY(insn) " %0, 0(%2)\n" \ "csrc mstatus, %1\n" \ : "=&r"(value) : "r"(mprv), "r"(p) : "memory" \ ); \ return value; \ } #define DEFINE_MPRV_READ(name, type, insn) \ DEFINE_MPRV_READ_FLAGS(name, type, insn, MSTATUS_MPRV) #define DEFINE_MPRV_READ_MXR(name, type, insn) \ DEFINE_MPRV_READ_FLAGS(name, type, insn, MSTATUS_MPRV | MSTATUS_MXR) #define DEFINE_MPRV_WRITE(name, type, insn) \ static inline void name(type *p, type value); \ static inline void name(type *p, type value) \ { \ size_t mprv = MSTATUS_MPRV; \ asm ( \ "csrs mstatus, %0\n" \ STRINGIFY(insn) " %1, 0(%2)\n" \ "csrc mstatus, %0\n" \ :: "r"(mprv), "r"(value), "r"(p) : "memory" \ ); \ } /* * 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) DEFINE_MPRV_READ(mprv_read_u64, uint64_t, ld) DEFINE_MPRV_READ(mprv_read_long, long, ld) DEFINE_MPRV_READ(mprv_read_ulong, unsigned long, ld) DEFINE_MPRV_READ_MXR(mprv_read_mxr_u8, uint8_t, lbu) DEFINE_MPRV_READ_MXR(mprv_read_mxr_u16, uint16_t, lhu) DEFINE_MPRV_READ_MXR(mprv_read_mxr_u32, uint32_t, lwu) DEFINE_MPRV_READ_MXR(mprv_read_mxr_u64, uint64_t, ld) DEFINE_MPRV_READ_MXR(mprv_read_mxr_long, long, ld) DEFINE_MPRV_READ_MXR(mprv_read_mxr_ulong, unsigned long, ld) DEFINE_MPRV_WRITE(mprv_write_u8, uint8_t, sb) DEFINE_MPRV_WRITE(mprv_write_u16, uint16_t, sh) DEFINE_MPRV_WRITE(mprv_write_u32, uint32_t, sw) DEFINE_MPRV_WRITE(mprv_write_u64, uint64_t, sd) DEFINE_MPRV_WRITE(mprv_write_long, long, sd) DEFINE_MPRV_WRITE(mprv_write_ulong, unsigned long, sd) #if __riscv_xlen == 32 DEFINE_MPRV_READ(mprv_read_uintptr_t, uintptr_t, lw) DEFINE_MPRV_READ(mprv_write_uintptr_t, uintptr_t, sw) #elif __riscv_xlen == 64 DEFINE_MPRV_READ(mprv_read_uintptr_t, uintptr_t, ld) DEFINE_MPRV_READ(mprv_write_uintptr_t, uintptr_t, sd) #endif #undef DEFINE_MPRV_READ_FLAGS #undef DEFINE_MPRV_READ #undef DEFINE_MPRV_READ_MXR #undef DEFINE_MPRV_WRITE #endif