141 lines
4.8 KiB
C
141 lines
4.8 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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#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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#endif
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#if MICROPY_PY_MACHINE
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#define PAGE_SIZE 4096
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#define PAGE_MASK (PAGE_SIZE - 1)
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STATIC mp_uint_t get_addr(mp_obj_t addr_o, uint align) {
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mp_uint_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 mp_uint_t last_base = (mp_uint_t)-1;
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static mp_uint_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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mp_uint_t cur_base = addr & ~PAGE_MASK;
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if (cur_base != last_base) {
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map_page = (mp_uint_t)mmap(NULL, 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 & 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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typedef struct _machine_mem_obj_t {
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mp_obj_base_t base;
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unsigned elem_size; // in bytes
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} machine_mem_obj_t;
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STATIC void machine_mem_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)kind;
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machine_mem_obj_t *self = self_in;
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mp_printf(print, "<%u-bit memory>", 8 * self->elem_size);
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}
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STATIC mp_obj_t machine_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
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// TODO support slice index to read/write multiple values at once
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machine_mem_obj_t *self = self_in;
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if (value == MP_OBJ_NULL) {
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// delete
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return MP_OBJ_NULL; // op not supported
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} else if (value == MP_OBJ_SENTINEL) {
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// load
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mp_uint_t addr = get_addr(index, self->elem_size);
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uint32_t val;
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switch (self->elem_size) {
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case 1: val = (*(uint8_t*)addr); break;
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case 2: val = (*(uint16_t*)addr); break;
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default: val = (*(uint32_t*)addr); break;
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}
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return mp_obj_new_int(val);
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} else {
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// store
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mp_uint_t addr = get_addr(index, self->elem_size);
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uint32_t val = mp_obj_get_int(value);
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switch (self->elem_size) {
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case 1: (*(uint8_t*)addr) = val; break;
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case 2: (*(uint16_t*)addr) = val; break;
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default: (*(uint32_t*)addr) = val; break;
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}
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return mp_const_none;
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}
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}
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STATIC const mp_obj_type_t machine_mem_type = {
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{ &mp_type_type },
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.name = MP_QSTR_mem,
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.print = machine_mem_print,
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.subscr = machine_mem_subscr,
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};
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STATIC const machine_mem_obj_t machine_mem8_obj = {{&machine_mem_type}, 1};
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STATIC const machine_mem_obj_t machine_mem16_obj = {{&machine_mem_type}, 2};
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STATIC const machine_mem_obj_t machine_mem32_obj = {{&machine_mem_type}, 4};
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STATIC const mp_map_elem_t machine_module_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_machine) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem8), (mp_obj_t)&machine_mem8_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem16), (mp_obj_t)&machine_mem16_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem32), (mp_obj_t)&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_machine,
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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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