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