add serial device struct

other changes:
  - change from main() to kmain() in crt0.s and kernel.c
  - new file devices.h to define all address locations for devices
  - new data type
      - register_t as volatile uint8_t for registers in devices
      - size_t from libc

1 files changed, 13 insertions, 0 deletions

diff --git a/sw/z80/kernel/include/devices.h b/sw/z80/kernel/include/devices.h
new file mode 100644
index 0000000..ea29065
--- /dev/null
+++ b/sw/z80/kernel/include/devices.h
@@ -0,0 +1,13 @@
+#ifndef __DEVICES_H__
+#define __DEVICES_H__
+
+#define ADDR_DEV_ROM_L      0x0000
+#define ADDR_DEV_ROM_H      0x2000
+
+#define ADDR_DEV_USART   0x4000
+#define ADDR_DEV_CTC     
+#define ADDR_DEV_PIO
+
+#define ADDR_DEV_RAM        0x8000
+
+#endif