unix: Move modmachine into unix directory

This leaves behind the common functionality in extmod/machine_mem.c
which can be used by all ports.

extmod/machine_mem.c

@@ -0,0 +1,77 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * 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.
+ */
+
+#include "extmod/machine_mem.h"
+
+#if MICROPY_PY_MACHINE
+
+STATIC void machine_mem_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    (void)kind;
+    machine_mem_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_printf(print, "<%u-bit memory>", 8 * self->elem_size);
+}
+
+STATIC mp_obj_t machine_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
+    // TODO support slice index to read/write multiple values at once
+    machine_mem_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    if (value == MP_OBJ_NULL) {
+        // delete
+        return MP_OBJ_NULL; // op not supported
+    } else if (value == MP_OBJ_SENTINEL) {
+        // load
+        uintptr_t addr = machine_mem_get_read_addr(index, self->elem_size);
+        uint32_t val;
+        switch (self->elem_size) {
+            case 1: val = (*(uint8_t*)addr); break;
+            case 2: val = (*(uint16_t*)addr); break;
+            default: val = (*(uint32_t*)addr); break;
+        }
+        return mp_obj_new_int(val);
+    } else {
+        // store
+        uintptr_t addr = machine_mem_get_write_addr(index, self->elem_size);
+        uint32_t val = mp_obj_get_int(value);
+        switch (self->elem_size) {
+            case 1: (*(uint8_t*)addr) = val; break;
+            case 2: (*(uint16_t*)addr) = val; break;
+            default: (*(uint32_t*)addr) = val; break;
+        }
+        return mp_const_none;
+    }
+}
+
+const mp_obj_type_t machine_mem_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_mem,
+    .print = machine_mem_print,
+    .subscr = machine_mem_subscr,
+};
+
+const machine_mem_obj_t machine_mem8_obj = {{&machine_mem_type}, 1};
+const machine_mem_obj_t machine_mem16_obj = {{&machine_mem_type}, 2};
+const machine_mem_obj_t machine_mem32_obj = {{&machine_mem_type}, 4};
+
+#endif // MICROPY_PY_MACHINE