Separate kernel code from test code

Eventually I want the kernel to be loaded from the SD card as well, but
it still needs to separate from user programs.

At some point there should be a folder just for the BIOS, which should
read from the boot block of the SD card and start executing, and thats
it.

sw/kernel/devices/io.inc65

@@ -0,0 +1,18 @@
+SEVEN_SEG   = $7ff0
+
+UART        = $7ff4
+UART_TXB    = UART
+UART_RXB    = UART
+UART_STATUS = UART + 1
+
+LED         = $7ff6
+SW          = LED
+
+MM_CTRL		= $7ff7
+MM_DATA		= $7fe0
+
+SD_ARG      = $7ff8
+SD_CMD      = $7ffc
+SD_DATA     = $7ffd
+
+IRQ_STATUS  = $7fff