ports: Make new ports/ sub-directory and move all ports there.

This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.

ports/esp8266/esp_mphal.h

@@ -0,0 +1,95 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 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 "py/ringbuf.h"
+#include "lib/utils/interrupt_char.h"
+#include "xtirq.h"
+
+void mp_keyboard_interrupt(void);
+
+struct _mp_print_t;
+// Structure for UART-only output via mp_printf()
+extern const struct _mp_print_t mp_debug_print;
+
+extern ringbuf_t input_buf;
+// Call this after putting data to input_buf
+void mp_hal_signal_input(void);
+// Call this when data is available in dupterm object
+void mp_hal_signal_dupterm_input(void);
+
+void mp_hal_init(void);
+void mp_hal_rtc_init(void);
+
+uint32_t mp_hal_ticks_us(void);
+__attribute__((always_inline)) static inline uint32_t mp_hal_ticks_cpu(void) {
+  uint32_t ccount;
+  __asm__ __volatile__("rsr %0,ccount":"=a" (ccount));
+  return ccount;
+}
+
+void mp_hal_delay_us(uint32_t);
+void mp_hal_set_interrupt_char(int c);
+uint32_t mp_hal_get_cpu_freq(void);
+
+#define UART_TASK_ID 0
+#define DUPTERM_TASK_ID 1
+void uart_task_init();
+void dupterm_task_init();
+
+void ets_event_poll(void);
+#define ETS_POLL_WHILE(cond) { while (cond) ets_event_poll(); }
+
+// needed for machine.I2C
+#include "osapi.h"
+#define mp_hal_delay_us_fast(us) os_delay_us(us)
+
+#define mp_hal_quiet_timing_enter() disable_irq()
+#define mp_hal_quiet_timing_exit(irq_state) enable_irq(irq_state)
+
+// C-level pin HAL
+#include "etshal.h"
+#include "gpio.h"
+#include "esp8266/modmachine.h"
+#define MP_HAL_PIN_FMT "%u"
+#define mp_hal_pin_obj_t uint32_t
+#define mp_hal_get_pin_obj(o) mp_obj_get_pin(o)
+#define mp_hal_pin_name(p) (p)
+void mp_hal_pin_input(mp_hal_pin_obj_t pin);
+void mp_hal_pin_output(mp_hal_pin_obj_t pin);
+void mp_hal_pin_open_drain(mp_hal_pin_obj_t pin);
+#define mp_hal_pin_od_low(p) do { \
+        if ((p) == 16) { WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | 1); } \
+        else { gpio_output_set(0, 1 << (p), 1 << (p), 0); } \
+    } while (0)
+#define mp_hal_pin_od_high(p) do { \
+        if ((p) == 16) { WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); } \
+        else { gpio_output_set(1 << (p), 0, 1 << (p), 0); } \
+    } while (0)
+#define mp_hal_pin_read(p) pin_get(p)
+#define mp_hal_pin_write(p, v) pin_set((p), (v))
+
+void *ets_get_esf_buf_ctlblk(void);
+int ets_esf_free_bufs(int idx);