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-rw-r--r--sw/z80/crt0.s4
-rw-r--r--sw/z80/kernel/include/devices.h13
-rw-r--r--sw/z80/kernel/include/serial.h85
-rw-r--r--sw/z80/kernel/include/types.h2
-rw-r--r--sw/z80/kernel/kernel.c7
-rw-r--r--sw/z80/libc/mem.c7
6 files changed, 104 insertions, 14 deletions
diff --git a/sw/z80/crt0.s b/sw/z80/crt0.s
index 7701ca6..00c7da1 100644
--- a/sw/z80/crt0.s
+++ b/sw/z80/crt0.s
@@ -27,7 +27,7 @@
;--------------------------------------------------------------------------
.module crt0
- .globl _main
+ .globl _kmain
.area _HEADER (ABS)
;; Reset vector
@@ -56,7 +56,7 @@ init:
;; Initialise global variables
call gsinit
- call _main
+ call _kmain
jp _exit
;; Ordering of segments for the linker.
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
diff --git a/sw/z80/kernel/include/serial.h b/sw/z80/kernel/include/serial.h
new file mode 100644
index 0000000..03e2448
--- /dev/null
+++ b/sw/z80/kernel/include/serial.h
@@ -0,0 +1,85 @@
+#ifndef __SERIAL_H__
+#define __SERIAL_H__
+
+#include "types.h"
+#include "devices.h"
+
+/* this structure is only for internal usage */
+struct _usart_device
+{
+ register_t buffer; // also used as LSB for divisor latch
+
+ struct IER
+ {
+ volatile int received_data_interrupt :1;
+ volatile int transmitter_empty_interrupt :1;
+ volatile int receiver_line_status_interrupt :1;
+ volatile int modem_status_interrupt :1;
+ volatile int reserved :4;
+ } IER;
+
+ struct IIR
+ {
+ volatile int interrupt_pending :1;
+ volatile int interrupt_id :3;
+ volatile int reserved :2;
+ volatile int fifos :2;
+ } IIR;
+
+ struct FCR
+ {
+ volatile int fifo_enable :1;
+ volatile int receiver_fifo_rst :1;
+ }
+
+ struct LCR
+ {
+ volatile int word_length :2;
+ volatile int stop_bits :1;
+ volatile int parity :1;
+ volatile int even_parity :1;
+ volatile int stick_parity :1;
+ volatile int break_control :1;
+ volatile int divisor_latch_access :1;
+ } LCR;
+
+ struct MCR
+ {
+ volatile int data_terminal_ready :1;
+ volatile int request_to_send :1;
+ volatile int out1;
+ volatile int out2;
+ volatile int loop;
+ volatile int autoflow :1;
+ volatile int reserved :2;
+ } MCR;
+
+ struct LSR
+ {
+ volatile int data_ready :1;
+ volatile int overrun_error :1;
+ volatile int parity_error :1;
+ volatile int framing_error :1;
+ volatile int break_interrupt :1;
+ volatile int transmitter_register :1;
+ volatile int transmitter_emtpy :1;
+ volatile int fifo_recv_error :1;
+ } LSR;
+
+ struct MSR
+ {
+ volatile int delta_cts :1;
+ volatile int delta_data_set_ready :1;
+ volatile int trailing_edge_ring_indicator :1;
+ volatile int delta_data_carrier_detect :1;
+ volatile int clear_to_send :1;
+ volatile int data_set_ready :1;
+ volatile int ring_indicator :1;
+ volatile int data_carrier_detect :1;
+ } MSR;
+
+ register_t scratch;
+} *_usart = (_usart_device *) ADDR_DEV_USART;
+
+
+#endif // __SERIAL__H__
diff --git a/sw/z80/kernel/include/types.h b/sw/z80/kernel/include/types.h
index c24b311..552b7e9 100644
--- a/sw/z80/kernel/include/types.h
+++ b/sw/z80/kernel/include/types.h
@@ -1,6 +1,8 @@
#ifndef __TYPES_H__
#define __TYPES_H__
+#define register_t volatile unsigned char
+
#define int8_t char
#define uint8_t unsigned char
#define int16_t int
diff --git a/sw/z80/kernel/kernel.c b/sw/z80/kernel/kernel.c
index fe87c3d..3db6579 100644
--- a/sw/z80/kernel/kernel.c
+++ b/sw/z80/kernel/kernel.c
@@ -1,10 +1,7 @@
#include "types.h"
-void main(void)
+void kmain(void)
{
- int i, j = 20;
- for (i = 0; i < 10; i++) {
- j--;
- }
+
}
diff --git a/sw/z80/libc/mem.c b/sw/z80/libc/mem.c
deleted file mode 100644
index 667a752..0000000
--- a/sw/z80/libc/mem.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include "types.h"
-#include "mem.h"
-
-void *malloc(size_t size)
-{
- :
-}