2eb844e0b4
To let unix port implement "machine" functionality on Python level, and keep consistent naming in other ports (baremetal ports will use magic module "symlinking" to still load it on "import machine"). Fixes #1701.
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*
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* This file is part of the Micro Python 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, 2014 Damien P. George
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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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#include <stdio.h>
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#include <stdint.h>
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#include "py/nlr.h"
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#include "py/obj.h"
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#include "extmod/machine_mem.h"
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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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#if MICROPY_PY_MACHINE
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uintptr_t machine_mem_get_read_addr(mp_obj_t addr_o, uint align) {
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uintptr_t addr = mp_obj_int_get_truncated(addr_o);
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if ((addr & (align - 1)) != 0) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "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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fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (fd == -1) {
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errno)));
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}
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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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uintptr_t machine_mem_get_write_addr(mp_obj_t addr_o, uint align) {
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return machine_mem_get_read_addr(addr_o, align);
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}
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STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_umachine) },
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{ MP_ROM_QSTR(MP_QSTR_mem8), MP_ROM_PTR(&machine_mem8_obj) },
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{ MP_ROM_QSTR(MP_QSTR_mem16), MP_ROM_PTR(&machine_mem16_obj) },
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{ MP_ROM_QSTR(MP_QSTR_mem32), MP_ROM_PTR(&machine_mem32_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);
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const mp_obj_module_t mp_module_machine = {
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.base = { &mp_type_module },
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.name = MP_QSTR_umachine,
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.globals = (mp_obj_dict_t*)&machine_module_globals,
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};
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#endif // MICROPY_PY_MACHINE
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