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// Template file with defines of peripheral registers
// QtMips simulator https://github.com/cvut/QtMips/
// developed by Karel Koci and Pavel Pisa.
//
// template.S - example file
//
// (C) 2019 by Pavel Pisa
// e-mail: pisa@cmp.felk.cvut.cz
// homepage: http://cmp.felk.cvut.cz/~pisa
// work: http://www.pikron.com/
// license: public domain
.globl _start
.globl __start
.set noreorder
.ent _start
// Serial port/terminal registers
// There is mirror of this region at address 0xffff0000
// to match QtSpim and Mars emulators
.equ SERIAL_PORT_BASE, 0xffffc000 // base address of serial port region
.equ SERP_RX_ST_REG, 0xffffc000 // Receiver status register
.equ SERP_RX_ST_REG_o, 0x0000 // Offset of RX_ST_REG
.equ SERP_RX_ST_REG_READY_m, 0x1 // Data byte is ready to be read
.equ SERP_RX_ST_REG_IE_m, 0x2 // Enable Rx ready interrupt
.equ SERP_RX_DATA_REG, 0xffffc004 // Received data byte in 8 LSB bits
.equ SERP_RX_DATA_REG_o, 0x0004 // Offset of RX_DATA_REG
.equ SERP_TX_ST_REG, 0xffffc008 // Transmitter status register
.equ SERP_TX_ST_REG_o, 0x0008 // Offset of TX_ST_REG
.equ SERP_TX_ST_REG_READY_m, 0x1 // Transmitter can accept next byte
.equ SERP_TX_ST_REG_IE_m, 0x2 // Enable Tx ready interrupt
.equ SERP_TX_DATA_REG, 0xffffc00c // Write word to send 8 LSB bits to terminal
.equ SERP_TX_DATA_REG_o, 0x000c // Offset of TX_DATA_REG
// Memory mapped peripheral for dial knobs input,
// LED and RGB LEDs output designed to match
// MZ_APO education Zynq based board developed
// by Petr Porazil and Pavel Pisa at PiKRON.com company
.equ SPILED_REG_BASE 0xffffc100 // base of SPILED port region
.equ SPILED_REG_LED_LINE, 0xffffc104 // 32 bit word mapped as output
.equ SPILED_REG_LED_LINE_o, 0x0004 // Offset of the LED_LINE
.equ SPILED_REG_LED_RGB1, 0xffffc110 // RGB LED 1 color components
.equ SPILED_REG_LED_RGB1_o, 0x0010 // Offset of LED_RGB1
.equ SPILED_REG_LED_RGB2, 0xffffc114 // RGB LED 2 color components
.equ SPILED_REG_LED_RGB2_o, 0x0014 // Offset of LED_RGB2
.equ SPILED_REG_KNOBS_8BIT, 0xffffc124 // Three 8 bit knob values
.equ SPILED_REG_KNOBS_8BIT_o, 0x0024 // Offset of KNOBS_8BIT
// The simple 16-bit per pixel (RGB565) frame-buffer
// display size is 480 x 320 pixel
// Pixel format RGB565 expect
// bits 11 .. 15 red component
// bits 5 .. 10 green component
// bits 0 .. 4 blue component
.equ LCD_FB_START, 0xffe00000
.equ LCD_FB_END, 0xffe4afff
// Mapping of interrupts
// Irq number Cause/Status Bit Source
// 2 / HW0 10 Serial port ready to accept character to Tx
// 3 / HW1 11 There is received character ready to be read
// 7 / HW5 15 Counter reached value in Compare register
// Linux kernel compatible system calls subset
.equ __NR_exit, 4001 // void exit(int status)
.equ __NR_read, 4003 // ssize_t read(int fd, void *buf, size_t count)
.equ __NR_write, 4004 // ssize_t write(int fd, const void *buf, size_t count)
.equ __NR_close, 4006 // int close(int fd)
.equ __NR_open, 4005 // int open(const char *pathname, int flags, mode_t mode)
.equ __NR_brk, 4045 // void * brk(void *addr)
.equ __NR_truncate, 4092 // int ftruncate(int fd, off_t length)
.equ __NR_readv, 4145 // ssize_t readv(int fd, const struct iovec *iov, int iovcnt)
.equ __NR_writev, 4146 // ssize_t writev(int fd, const struct iovec *iov, int iovcnt)
.equ __NR_set_thread_area, 4283 // int set_thread_area(unsigned long addr)
// Original MIPS start address after reset
.org 0x80020000
.text
__start:
_start:
addi $v0, $zero, __NR_write
addi $a0, $zero, 1
la $a1, text_1
addi $a2, $zero, text_1_e - text_1
syscall
addi $v0, $zero, __NR_exit
addi $a0, $zero, 0
final: break
beq $zero, $zero, final
nop
.end _start
.data
data_1: .word 1, 2, 3, 4
text_1: .ascii "Hello word.\n" // store ASCII text, no termination
text_1_e:
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