93c9130a67
CSRs are XLEN bits wide (i.e. the same width as general purpose registers), so size_t seems a little more correct than int. This change doesn't affect functionality because MSTATUS_MPRV already fits in 31 bits. Change-Id: I003c1b88b4493681dc9b6178ac785be330203ef5 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/25625 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
98 lines
3.6 KiB
C
98 lines
3.6 KiB
C
/*
|
|
* 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
|