diff options
Diffstat (limited to 'sw/z80/kernel')
| -rw-r--r-- | sw/z80/kernel/crt0.s | 103 | ||||
| -rw-r--r-- | sw/z80/kernel/drivers/ctc.c | 6 | ||||
| -rw-r--r-- | sw/z80/kernel/drivers/pio.c | 40 | ||||
| -rw-r--r-- | sw/z80/kernel/drivers/usart.c | 91 | ||||
| -rw-r--r-- | sw/z80/kernel/include/drivers/ctc.h | 6 | ||||
| -rw-r--r-- | sw/z80/kernel/include/drivers/pio.h | 37 | ||||
| -rw-r--r-- | sw/z80/kernel/include/drivers/usart.h | 155 | ||||
| -rw-r--r-- | sw/z80/kernel/makefile | 53 |
8 files changed, 156 insertions, 335 deletions
diff --git a/sw/z80/kernel/crt0.s b/sw/z80/kernel/crt0.s new file mode 100644 index 0000000..00c7da1 --- /dev/null +++ b/sw/z80/kernel/crt0.s @@ -0,0 +1,103 @@ +;-------------------------------------------------------------------------- +; crt0.s - Generic crt0.s for a Z80 +; +; Copyright (C) 2000, Michael Hope +; +; This library is free software; you can redistribute it and/or modify it +; under the terms of the GNU General Public License as published by the +; Free Software Foundation; either version 2, or (at your option) any +; later version. +; +; This library is distributed in the hope that it will be useful, +; but WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +; GNU General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this library; see the file COPYING. If not, write to the +; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, +; MA 02110-1301, USA. +; +; As a special exception, if you link this library with other files, +; some of which are compiled with SDCC, to produce an executable, +; this library does not by itself cause the resulting executable to +; be covered by the GNU General Public License. This exception does +; not however invalidate any other reasons why the executable file +; might be covered by the GNU General Public License. +;-------------------------------------------------------------------------- + + .module crt0 + .globl _kmain + + .area _HEADER (ABS) + ;; Reset vector + .org 0 + jp init + + .org 0x08 + reti + .org 0x10 + reti + .org 0x18 + reti + .org 0x20 + reti + .org 0x28 + reti + .org 0x30 + reti + .org 0x38 + reti + + .org 0x100 +init: + ;; Set stack pointer directly above top of memory. + ld sp,#0xFFFF + + ;; Initialise global variables + call gsinit + call _kmain + jp _exit + + ;; Ordering of segments for the linker. + .area _HOME + .area _CODE + .area _INITIALIZER + .area _GSINIT + .area _GSFINAL + + .area _DATA + .area _INITIALIZED + .area _BSEG + .area _BSS + .area _HEAP + + .area _CODE + +__clock:: + ld a,#2 + rst 0x08 + ret + +_exit:: + ;; Exit - special code to the emulator + ld a,#0 + rst 0x08 +1$: + halt + jr 1$ + + .area _GSINIT +gsinit:: + ; ld bc, #l__INITIALIZER + ld a, b + or a, c + jr Z, gsinit_next + ; ld de, #s__INITIALIZED + ; ld hl, #s__INITIALIZER + ldir +gsinit_next: + + .area _GSFINAL + ret + diff --git a/sw/z80/kernel/drivers/ctc.c b/sw/z80/kernel/drivers/ctc.c deleted file mode 100644 index 841202a..0000000 --- a/sw/z80/kernel/drivers/ctc.c +++ /dev/null @@ -1,6 +0,0 @@ -#include "drivers/ctc.h" - -void ctc_control() -{ - -} diff --git a/sw/z80/kernel/drivers/pio.c b/sw/z80/kernel/drivers/pio.c deleted file mode 100644 index 4321fb8..0000000 --- a/sw/z80/kernel/drivers/pio.c +++ /dev/null @@ -1,40 +0,0 @@ -#include "drivers/pio.h" - -static uint8_t *pio_port = (uint8_t *) ADDR_DEV_PIO; -static uint8_t *pio_ctrl = (uint8_t *) (ADDR_DEV_PIO + 2); - -inline void _pio_data(int port, uint8_t data) -{ - *(pio_port + port) = data; -} - -inline void _pio_control(int port, uint8_t cmd) -{ - *(pio_ctrl + port) = cmd; -} - -void pio_set_mode(int port, int mode, uint8_t io) -{ - // 0x0F is a control sequence to set mode - _pio_control(port, ((mode << 6) | 0x0F)); - - // this mode requires an additional argument that sets - // a mode for each pin - if (mode == PIO_MODE_BIT_IO) { - _pio_control(port, io); - } -} - -void pio_set_interrupts(int port, int control) -{ - // 0x07 is a control sequence to set interrupts - _pio_control(port, (control | 0x07)); -} - -void pio_set_interrupts_mask(int port, int control, uint8_t mask) -{ - // 0x17 is a control sequence to set interrupts - // and to interpret the next byte as a mask - _pio_control(port, (control | 0x17)); - _pio_control(port, mask); -} diff --git a/sw/z80/kernel/drivers/usart.c b/sw/z80/kernel/drivers/usart.c deleted file mode 100644 index c54fe37..0000000 --- a/sw/z80/kernel/drivers/usart.c +++ /dev/null @@ -1,91 +0,0 @@ -#include "drivers/usart.h" - -static struct _usart_device *_usart = (struct _usart_device *) ADDR_DEV_USART; - -void usart_set_baudrate(uint16_t baudrate) -{ - // enable latch access - _usart->LCR.divisor_latch_access = 1; - _usart->buffer = 0x00FF & baudrate; // LSBs - memcpy(&_usart->IER, &(baudrate >>8), 1); - // _usart->IER = 0x00FF & (baudrate >> 8); // MSBs - _usart->LCR.divisor_latch_access = 0; -} - -void usart_set_parity(int mode) -{ - if (mode == USART_PARITY_EVEN) { - _usart->LCR.even_parity = 1; - } - else if (mode == USART_PARITY_ODD) { - _usart->LCR.even_parity = 0; - } - - _usart->LCR.parity = (mode == USART_PARITY_NONE) ? 0 : 1; -} - -void usart_set_stop_bits(int count) -{ - _usart->LCR.stop_bits = (count == USART_STOP_BITS_1) ? 0 : 1; -} - -void usart_word_length(int length) -{ - _usart->LCR.word_length = length; -} - -void usart_set_autoflow(int mode) -{ - _usart->MCR.autoflow = (mode == USART_AUTOFLOW_OFF) ? 0 : 1; - _usart->MCR.data_terminal_ready = (mode == USART_AUTOFLOW_ALL); -} - -inline void usart_init(uint16_t baudrate, int parity, int stop_bits) -{ - usart_set_baudrate(baudrate); - usart_set_parity(parity); - usart_set_stop_bits(stop_bits); - usart_set_autoflow(USART_AUTOFLOW_OFF); -} - -void usart_transmit(uint8_t data) -{ - _usart->buffer = data; - while (_usart->LSR.transmitter_holder_empty == 0); // wait -} - -uint8_t usart_receive() -{ - return _usart->buffer; -} - -int usart_write(uint8_t *data, size_t size) -{ - uint8_t *dp = data; - - while (size--) { - _usart->buffer = *(dp++); - while (_usart->LSR.transmitter_empty); - } - - // TODO: do something that actually counts for sent bytes - return size; -} - -int usart_read(uint8_t *buffer, size_t count) -{ - uint8_t *bp = buffer; - size_t read_count = 0; - - while (count--) { - *(bp++) = _usart->buffer; - // check for errors - if (_usart->LSR.framing_error || _usart->LSR.parity_error) { - bp--; // delete last byte (?) - } else { - read_count++; - } - } - - return read_count; -} diff --git a/sw/z80/kernel/include/drivers/ctc.h b/sw/z80/kernel/include/drivers/ctc.h deleted file mode 100644 index 80e8b4b..0000000 --- a/sw/z80/kernel/include/drivers/ctc.h +++ /dev/null @@ -1,6 +0,0 @@ -#ifndef __CTC_H__ -#define __CTC_H__ - -void ctc_control(); - -#endif /* __CTC_H__ */ diff --git a/sw/z80/kernel/include/drivers/pio.h b/sw/z80/kernel/include/drivers/pio.h deleted file mode 100644 index 0df2ed0..0000000 --- a/sw/z80/kernel/include/drivers/pio.h +++ /dev/null @@ -1,37 +0,0 @@ -#ifndef __PIO_H__ -#define __PIO_H__ - -#include "devices.h" -#include "types.h" - -#define PIO_A 0 -#define PIO_B 1 - -#define PIO_MODE_BYTE_IN 0 -#define PIO_MODE_BYTE_OUT 1 -#define PIO_MODE_BYTE_BI 2 -#define PIO_MODE_BIT_IO 3 - -#define PIO_INT_ACTIVE_HIGH (1<<5) -#define PIO_INT_AND_MODE (1<<6) -#define PIO_INT_ENABLE (1<<7) - - -inline void _pio_data(int port, uint8_t data); -inline void _pio_control(int port, uint8_t cmd); - -void pio_set_mode(int port, int mode, uint8_t io); - -void pio_set_interrupts(int port, int control); -void pio_set_interrupts_mask(int port, int control, uint8_t mask); - -// uint8_t pio_read_data(int port); -uint8_t pio_read(int port); -void pio_write(int port, uint8_t data); - -inline int pio_read_pin(int port, uint8_t pin); -inline void pio_write_pin(int port, uint8_t pin); - -// TODO: implement mode (in/out/both) and interrupt vector - -#endif // __PIO_H__ diff --git a/sw/z80/kernel/include/drivers/usart.h b/sw/z80/kernel/include/drivers/usart.h deleted file mode 100644 index b85ee3e..0000000 --- a/sw/z80/kernel/include/drivers/usart.h +++ /dev/null @@ -1,155 +0,0 @@ -#ifndef __USART_H__ -#define __USART_H__ - -#include "types.h" -#include "devices.h" - -#include "string.h" - -// baudrate clock divisors -// values from TL16C550C datasheet (table 9 for 1.8432 MHz crystal) -#define USART_BAUDRATE_50 2304 -#define USART_BAUDRATE_75 1536 -#define USART_BAUDRATE_110 1047 -#define USART_BAUDRATE_134_5 857 -#define USART_BAUDRATE_150 768 -#define USART_BAUDRATE_300 384 -#define USART_BAUDRATE_600 192 -#define USART_BAUDRATE_1200 96 -#define USART_BAUDRATE_1800 64 -#define USART_BAUDRATE_2000 58 -#define USART_BAUDRATE_2400 48 -#define USART_BAUDRATE_3600 32 -#define USART_BAUDRATE_4800 24 -#define USART_BAUDRATE_7200 16 -#define USART_BAUDRATE_9600 12 -#define USART_BAUDRATE_19200 6 -#define USART_BAUDRATE_38400 3 -#define USART_BAUDRATE_56000 3 - -// parity -#define USART_PARITY_NONE 0 -#define USART_PARITY_EVEN 1 -#define USART_PARITY_ODD 2 - -// stop bits -#define USART_STOP_BITS_1 10 -#define USART_STOP_BITS_15 15 -#define USART_STOP_BITS_2 20 - -// word lenght -#define USART_WORD_LENGTH_5 0 -#define USART_WORD_LENGTH_6 1 -#define USART_WORD_LENGTH_7 2 -#define USART_WORD_LENGTH_8 3 - -// autoflow -#define USART_AUTOFLOW_ALL 3 -#define USART_AUTOFLOW_CTS 2 -#define USART_AUTOFLOW_OFF 0 - -/* stuctures for usart registers */ -struct IER -{ - volatile uint received_data_interrupt :1; - volatile uint transmitter_empty_interrupt :1; - volatile uint receiver_line_status_interrupt :1; - volatile uint modem_status_interrupt :1; - volatile uint reserved :4; -}; - -struct IIR -{ - volatile uint interrupt_pending :1; - volatile uint interrupt_id :3; - volatile uint reserved :2; - volatile uint fifos :2; -}; - -struct FCR -{ - volatile uint fifo_enable :1; - volatile uint receiver_fifo_rst :1; - volatile uint trasmitter_fifo_rst :1; - volatile uint dma_mode_select :1; - volatile uint reserved :1; - volatile uint receiver_trigger :2; -}; - -struct LCR -{ - volatile uint word_length :2; - volatile uint stop_bits :1; - volatile uint parity :1; - volatile uint even_parity :1; - volatile uint stick_parity :1; - volatile uint break_control :1; - volatile uint divisor_latch_access :1; -}; - -struct MCR -{ - volatile uint data_terminal_ready :1; - volatile uint request_to_send :1; - volatile uint out1; - volatile uint out2; - volatile uint loop; - volatile uint autoflow :1; - volatile uint reserved :2; -}; - -struct LSR -{ - volatile uint data_ready :1; - volatile uint overrun_error :1; - volatile uint parity_error :1; - volatile uint framing_error :1; - volatile uint break_interrupt :1; - volatile uint transmitter_holder_empty :1; - volatile uint transmitter_empty :1; - volatile uint fifo_recv_error :1; -}; - -struct MSR -{ - volatile uint delta_cts :1; - volatile uint delta_data_set_ready :1; - volatile uint trailing_edge_ring_indicator :1; - volatile uint delta_data_carrier_detect :1; - volatile uint clear_to_send :1; - volatile uint data_set_ready :1; - volatile uint ring_indicator :1; - volatile uint data_carrier_detect :1; -}; - -/* this structure is only for internal usage */ -struct _usart_device -{ - register_t buffer; // also used as LSB for divisor latch - struct IER IER; - struct IIR IIR; - struct FCR FCR; - struct LCR LCR; - struct MCR MCR; - struct LSR LSR; - struct MSR MSR; - register_t scratch; -}; - - -// setup functions (wrappers) -void usart_set_baudrate(uint16_t baudrate); -void usart_set_parity(int mode); -void usart_set_stop_bits(int count); -void usart_set_word_length(int length); -void usart_set_autoflow(int mode); - -inline void usart_init(uint16_t baudrate, int parity, int stop_bits); - -void usart_transmit(uint8_t data); -uint8_t usart_receive(); - -int usart_write(uint8_t *data, size_t size); -int usart_read(uint8_t *buffer, size_t count); - -#endif // __USART__H__ diff --git a/sw/z80/kernel/makefile b/sw/z80/kernel/makefile new file mode 100644 index 0000000..be8eed4 --- /dev/null +++ b/sw/z80/kernel/makefile @@ -0,0 +1,53 @@ +#### +# source code settings +# +OSNAME := helvetiOS + +CSOURCES := $(wildcard *.c) \ + $(wildcard drivers/*.c) + +OBJECTS := $(patsubst %.c,build/%.rel,$(CSOURCES)) +HEXFILE := build/$(OSNAME).hex +BINARY := build/$(OSNAME).bin + +### +# compiler settings + +CC := sdcc + +CFLAGS := -mz80 \ + -I include \ + -I include/drivers \ + -I libc/include \ + --opt-code-size \ + -DDEBUG + +LDFLAGS := -mz80 --no-std-crt0 build/crt0.rel \ + --std-c89 -pedantic \ + --code-loc 0x0800 --data-loc 0x8000 + +.PHONY: dirs dis clean +all: $(BINARY) + +# build binary +$(BINARY): $(OBJECTS) dirs + $(CC) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE) + makebin -s 16384 $(HEXFILE) $(BINARY) + +$(OBJECTS): build/%.rel : %.c $(CSOURCES) dirs build/crt0.rel + @printf "\n" + $(CC) $(CFLAGS) -c $< -o $@ + +build/crt0.rel: crt0.s + sdasz80 -o $< + @mv crt0.rel build + +dirs: + mkdir -p build build/kernel build/libc build/kernel/drivers + +dis: $(BINARY) + dz80 -b -n $< + +clean: + - rm -rd build/* + - rm crt0.rel |