22e0c560bb
SBI is runtime service for OS. For an introduction, please refer to https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.md Change-Id: Ib6c1f21d2f085f02208305dc4e3a0f970d400c27 Signed-off-by: Xiang Wang <wxjstz@126.com> Reviewed-on: https://review.coreboot.org/28096 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
119 lines
4.5 KiB
C
119 lines
4.5 KiB
C
/*
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* Copyright (c) 2013, The Regents of the University of California (Regents).
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Regents nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
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* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
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* OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
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* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
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* HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
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* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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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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