add riscv64-mycpu

am/src/mycpu/boot/start.S

@@ -0,0 +1,8 @@
+.section entry, "ax"
+.globl _start
+.type _start, @function
+
+_start:
+  mv s0, zero
+  la sp, _stack_pointer
+  jal _trm_init

am/src/mycpu/include/mycpu.h

@@ -0,0 +1,5 @@
+#include <klib-macros.h>
+
+#define PMEM_SIZE (128 * 1024 * 1024)
+#define PMEM_END  ((uintptr_t)&_pmem_start + PMEM_SIZE)
+extern char _pmem_start;

am/src/mycpu/ioe/input.c

@@ -0,0 +1,6 @@
+#include <am.h>
+
+void __am_input_keybrd(AM_INPUT_KEYBRD_T *kbd) {
+
+
+}

am/src/mycpu/ioe/ioe.c

@@ -0,0 +1,33 @@
+#include <am.h>
+#include <klib-macros.h>
+
+void __am_timer_init();
+
+void __am_timer_rtc(AM_TIMER_RTC_T *);
+void __am_timer_uptime(AM_TIMER_UPTIME_T *);
+void __am_input_keybrd(AM_INPUT_KEYBRD_T *);
+void __am_timer_rtc(AM_TIMER_RTC_T *);
+
+static void __am_timer_config(AM_TIMER_CONFIG_T *cfg) { cfg->present = true; cfg->has_rtc = true; }
+static void __am_input_config(AM_INPUT_CONFIG_T *cfg) { cfg->present = true;  }
+
+typedef void (*handler_t)(void *buf);
+static void *lut[128] = {
+  [AM_TIMER_CONFIG] = __am_timer_config,
+  [AM_TIMER_RTC   ] = __am_timer_rtc,
+  [AM_TIMER_UPTIME] = __am_timer_uptime,
+  [AM_INPUT_CONFIG] = __am_input_config,
+  [AM_INPUT_KEYBRD] = __am_input_keybrd,
+};
+
+static void fail(void *buf) { panic("access nonexist register"); }
+
+bool ioe_init() {
+  for (int i = 0; i < LENGTH(lut); i++)
+    if (!lut[i]) lut[i] = fail;
+  __am_timer_init();
+  return true;
+}
+
+void ioe_read (int reg, void *buf) { ((handler_t)lut[reg])(buf); }
+void ioe_write(int reg, void *buf) { ((handler_t)lut[reg])(buf); }

am/src/mycpu/ioe/timer.c

@@ -0,0 +1,13 @@
+#include <am.h>
+
+void __am_timer_init() {
+
+}
+
+void __am_timer_uptime(AM_TIMER_UPTIME_T *uptime) {
+
+}
+
+void __am_timer_rtc(AM_TIMER_RTC_T *rtc) {
+
+}

am/src/mycpu/scripts/section.ld

@@ -0,0 +1,33 @@
+_pmem_start = 0x80000000;
+
+ENTRY(_start)
+
+SECTIONS {
+  . = _pmem_start + 0x100000;
+  .text : {
+    *(entry)
+    *(.text*)
+  }
+  etext = .;
+  _etext = .;
+  .rodata : {
+    *(.rodata*)
+  }
+  .data : {
+    *(.data)
+  }
+  edata = .;
+  _data = .;
+  .bss : {
+	_bss_start = .;
+    *(.bss*)
+    *(.sbss*)
+    *(.scommon)
+  }
+  _stack_top = ALIGN(0x1000);
+  . = _stack_top + 0x8000;
+  _stack_pointer = .;
+  end = .;
+  _end = .;
+  _heap_start = ALIGN(0x1000);
+}

am/src/mycpu/trm.c

@@ -0,0 +1,24 @@
+#include <am.h>
+#include <mycpu.h>
+
+extern char _heap_start;
+int main(const char *args);
+
+Area heap = RANGE(&_heap_start, PMEM_END);
+#ifndef MAINARGS
+#define MAINARGS ""
+#endif
+static const char mainargs[] = MAINARGS;
+
+void putch(char ch) {
+
+}
+
+void halt(int code) {
+  while (1);
+}
+
+void _trm_init() {
+  int ret = main(mainargs);
+  halt(ret);
+}