d1e50f9e9f
This also drops individual copyright notices, all mentioned authors in that part of the tree are listed in AUTHORS. Change-Id: I770c1afd9b68a40ec0e69818f24b5ef3ad4f1d35 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39283 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/* SPDX-License-Identifier: BSD-4-Clause-UC */
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/* This file is part of the coreboot project. */
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#ifndef _VM_H
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#define _VM_H
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#include <string.h>
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#include <stdint.h>
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#include <arch/encoding.h>
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#define EXTRACT_FIELD(val, which) (((val) & (which)) / ((which) & ~((which)-1)))
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#define INSERT_FIELD(val, which, fieldval) (((val) & ~(which)) | ((fieldval) * ((which) & ~((which)-1))))
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void mstatus_init(void); // need to setup mstatus so we know we have virtual memory
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#define DEFINE_MPRV_READ_FLAGS(name, type, insn, flags) \
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static inline type name(type *p); \
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static inline type name(type *p) \
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{ \
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size_t mprv = flags; \
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type value; \
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asm ( \
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"csrs mstatus, %1\n" \
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STRINGIFY(insn) " %0, 0(%2)\n" \
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"csrc mstatus, %1\n" \
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: "=&r"(value) : "r"(mprv), "r"(p) : "memory" \
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); \
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return value; \
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}
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#define DEFINE_MPRV_READ(name, type, insn) \
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DEFINE_MPRV_READ_FLAGS(name, type, insn, MSTATUS_MPRV)
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#define DEFINE_MPRV_READ_MXR(name, type, insn) \
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DEFINE_MPRV_READ_FLAGS(name, type, insn, MSTATUS_MPRV | MSTATUS_MXR)
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#define DEFINE_MPRV_WRITE(name, type, insn) \
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static inline void name(type *p, type value); \
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static inline void name(type *p, type value) \
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{ \
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size_t mprv = MSTATUS_MPRV; \
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asm ( \
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"csrs mstatus, %0\n" \
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STRINGIFY(insn) " %1, 0(%2)\n" \
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"csrc mstatus, %0\n" \
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:: "r"(mprv), "r"(value), "r"(p) : "memory" \
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); \
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}
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/*
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* mprv_{read,write}_* - Modified privilege memory access functions.
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*
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* These inline functions perform a read or write memory operation with the
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* mstatus.MPRV bit set. This causes the memory protections and translation of
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* the previous mode (e.g. U-mode, if we're handling a trap from U-mode) to be
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* applied.
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*
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* The user of these functions must make sure to avoid trap loops through
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* unaligned memory accesses.
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*/
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DEFINE_MPRV_READ(mprv_read_u8, uint8_t, lbu)
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DEFINE_MPRV_READ(mprv_read_u16, uint16_t, lhu)
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DEFINE_MPRV_READ(mprv_read_u32, uint32_t, lwu)
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DEFINE_MPRV_READ(mprv_read_u64, uint64_t, ld)
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DEFINE_MPRV_READ(mprv_read_long, long, ld)
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DEFINE_MPRV_READ(mprv_read_ulong, unsigned long, ld)
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DEFINE_MPRV_READ_MXR(mprv_read_mxr_u8, uint8_t, lbu)
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DEFINE_MPRV_READ_MXR(mprv_read_mxr_u16, uint16_t, lhu)
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DEFINE_MPRV_READ_MXR(mprv_read_mxr_u32, uint32_t, lwu)
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DEFINE_MPRV_READ_MXR(mprv_read_mxr_u64, uint64_t, ld)
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DEFINE_MPRV_READ_MXR(mprv_read_mxr_long, long, ld)
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DEFINE_MPRV_READ_MXR(mprv_read_mxr_ulong, unsigned long, ld)
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DEFINE_MPRV_WRITE(mprv_write_u8, uint8_t, sb)
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DEFINE_MPRV_WRITE(mprv_write_u16, uint16_t, sh)
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DEFINE_MPRV_WRITE(mprv_write_u32, uint32_t, sw)
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DEFINE_MPRV_WRITE(mprv_write_u64, uint64_t, sd)
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DEFINE_MPRV_WRITE(mprv_write_long, long, sd)
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DEFINE_MPRV_WRITE(mprv_write_ulong, unsigned long, sd)
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#if __riscv_xlen == 32
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DEFINE_MPRV_READ(mprv_read_uintptr_t, uintptr_t, lw)
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DEFINE_MPRV_READ(mprv_write_uintptr_t, uintptr_t, sw)
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#elif __riscv_xlen == 64
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DEFINE_MPRV_READ(mprv_read_uintptr_t, uintptr_t, ld)
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DEFINE_MPRV_READ(mprv_write_uintptr_t, uintptr_t, sd)
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#endif
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#undef DEFINE_MPRV_READ_FLAGS
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#undef DEFINE_MPRV_READ
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#undef DEFINE_MPRV_READ_MXR
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#undef DEFINE_MPRV_WRITE
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#endif
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