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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2023 Damien P. George
* Copyright (c) 2015 Paul Sokolovsky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
// This file is never compiled standalone, it's included directly from
// extmod/modmachine.c via MICROPY_PY_MACHINE_INCLUDEFILE.
#if MICROPY_PLAT_DEV_MEM
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#define MICROPY_PAGE_SIZE 4096
#define MICROPY_PAGE_MASK (MICROPY_PAGE_SIZE - 1)
#endif
uintptr_t mod_machine_mem_get_addr(mp_obj_t addr_o, uint align) {
uintptr_t addr = mp_obj_get_int_truncated(addr_o);
if ((addr & (align - 1)) != 0) {
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("address %08x is not aligned to %d bytes"), addr, align);
}
#if MICROPY_PLAT_DEV_MEM
{
// Not thread-safe
static int fd;
static uintptr_t last_base = (uintptr_t)-1;
static uintptr_t map_page;
if (!fd) {
int _fd = open("/dev/mem", O_RDWR | O_SYNC);
if (_fd == -1) {
mp_raise_OSError(errno);
}
fd = _fd;
}
uintptr_t cur_base = addr & ~MICROPY_PAGE_MASK;
if (cur_base != last_base) {
map_page = (uintptr_t)mmap(NULL, MICROPY_PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, cur_base);
last_base = cur_base;
}
addr = map_page + (addr & MICROPY_PAGE_MASK);
}
#endif
return addr;
}
static void mp_machine_idle(void) {
#ifdef MICROPY_UNIX_MACHINE_IDLE
MICROPY_UNIX_MACHINE_IDLE
#else
// Do nothing.
#endif
}
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