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/*
* Copyright (c) 2013, The Regents of the University of California (Regents).
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Regents nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
* OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
* HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#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(name, type, insn) \
static inline type name(type *p); \
static inline type name(type *p) \
{ \
size_t mprv = MSTATUS_MPRV; \
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_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_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)
#undef DEFINE_MPRV_READ
#undef DEFINE_MPRV_WRITE
#endif