From: Sebastien Bourdeauducq Date: Thu, 21 Mar 2013 09:42:31 +0000 (+0100) Subject: software: add videomixer base files X-Git-Tag: 24jan2021_ls180~3016 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a6a3d9305979561b89246cda9fdbf2f2142172dc;p=litex.git software: add videomixer base files --- diff --git a/software/videomixer/Makefile b/software/videomixer/Makefile new file mode 100644 index 00000000..4b6bf278 --- /dev/null +++ b/software/videomixer/Makefile @@ -0,0 +1,44 @@ +M2DIR=../.. +include $(M2DIR)/software/common.mak + +OBJECTS=crt0.o isr.o main.o + +all: videomixer.bin + +# pull in dependency info for *existing* .o files +-include $(OBJECTS:.o=.d) + +%.bin: %.elf + $(OBJCOPY) -O binary $< $@ + chmod -x $@ + +videomixer.elf: linker.ld $(OBJECTS) libs + +%.elf: + $(LD) $(LDFLAGS) -T $< -N -o $@ $(OBJECTS) \ + -L$(M2DIR)/software/libbase \ + -L$(M2DIR)/software/libcompiler-rt \ + -lbase -lcompiler-rt + chmod -x $@ + +main.o: main.c + $(compile-dep) + +%.o: %.c + $(compile-dep) + +%.o: %.S + $(assemble) + +libs: + make -C $(M2DIR)/software/libcompiler-rt + make -C $(M2DIR)/software/libbase + +load: videomixer.bin + make -C $(M2DIR)/tools + $(M2DIR)/tools/flterm --port /dev/ttyUSB0 --kernel videomixer.bin + +clean: + rm -f $(OBJECTS) $(OBJECTS:.o=.d) videomixer.elf videomixer.bin .*~ *~ + +.PHONY: main.o clean libs load diff --git a/software/videomixer/crt0.S b/software/videomixer/crt0.S new file mode 100644 index 00000000..62797209 --- /dev/null +++ b/software/videomixer/crt0.S @@ -0,0 +1,167 @@ +/* + * LatticeMico32 C startup code. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* Exception handlers - Must be 32 bytes long. */ +.section .text, "ax", @progbits +.global _start +_start: +_reset_handler: + xor r0, r0, r0 + wcsr IE, r0 + mvhi r1, hi(_reset_handler) + ori r1, r1, lo(_reset_handler) + wcsr EBA, r1 + bi _crt0 + nop + nop + +_breakpoint_handler: + bi _breakpoint_handler + nop + nop + nop + nop + nop + nop + nop + +_instruction_bus_error_handler: + bi _instruction_bus_error_handler + nop + nop + nop + nop + nop + nop + nop + +_watchpoint_hander: + bi _watchpoint_hander + nop + nop + nop + nop + nop + nop + nop + +_data_bus_error_handler: + bi _data_bus_error_handler + nop + nop + nop + nop + nop + nop + nop + +_divide_by_zero_handler: + bi _divide_by_zero_handler + nop + nop + nop + nop + nop + nop + nop + +_interrupt_handler: + sw (sp+0), ra + calli .save_all + calli isr + bi .restore_all_and_eret + nop + nop + nop + nop + +macaddress: + .byte 0x10 + .byte 0xe2 + .byte 0xd5 + .byte 0x00 + .byte 0x00 + .byte 0x00 + + /* padding to align to a 32-bit boundary */ + .byte 0x00 + .byte 0x00 + +_crt0: + /* Setup stack and global pointer */ + mvhi sp, hi(_fstack) + ori sp, sp, lo(_fstack) + mvhi gp, hi(_gp) + ori gp, gp, lo(_gp) + + /* Clear BSS */ + mvhi r1, hi(_fbss) + ori r1, r1, lo(_fbss) + mvhi r3, hi(_ebss) + ori r3, r3, lo(_ebss) +.clearBSS: + be r1, r3, .callMain + sw (r1+0), r0 + addi r1, r1, 4 + bi .clearBSS + +.callMain: + bi main + +.save_all: + addi sp, sp, -56 + sw (sp+4), r1 + sw (sp+8), r2 + sw (sp+12), r3 + sw (sp+16), r4 + sw (sp+20), r5 + sw (sp+24), r6 + sw (sp+28), r7 + sw (sp+32), r8 + sw (sp+36), r9 + sw (sp+40), r10 + sw (sp+48), ea + sw (sp+52), ba + /* ra needs to be moved from initial stack location */ + lw r1, (sp+56) + sw (sp+44), r1 + ret + +.restore_all_and_eret: + lw r1, (sp+4) + lw r2, (sp+8) + lw r3, (sp+12) + lw r4, (sp+16) + lw r5, (sp+20) + lw r6, (sp+24) + lw r7, (sp+28) + lw r8, (sp+32) + lw r9, (sp+36) + lw r10, (sp+40) + lw ra, (sp+44) + lw ea, (sp+48) + lw ba, (sp+52) + addi sp, sp, 56 + eret diff --git a/software/videomixer/isr.c b/software/videomixer/isr.c new file mode 100644 index 00000000..74dbe342 --- /dev/null +++ b/software/videomixer/isr.c @@ -0,0 +1,15 @@ +#include +#include +#include +#include + +void isr(void); +void isr(void) +{ + unsigned int irqs; + + irqs = irq_pending() & irq_getmask(); + + if(irqs & (1 << UART_INTERRUPT)) + uart_isr(); +} diff --git a/software/videomixer/linker.ld b/software/videomixer/linker.ld new file mode 100644 index 00000000..fd17edbf --- /dev/null +++ b/software/videomixer/linker.ld @@ -0,0 +1,56 @@ +OUTPUT_FORMAT("elf32-lm32") +ENTRY(_start) + +__DYNAMIC = 0; + +MEMORY { + sdram : ORIGIN = 0x40000000, LENGTH = 0x08000000 /* 128M */ +} + +SECTIONS +{ + .text : + { + _ftext = .; + *(.text .stub .text.* .gnu.linkonce.t.*) + _etext = .; + } > sdram + + .rodata : + { + . = ALIGN(4); + _frodata = .; + *(.rodata .rodata.* .gnu.linkonce.r.*) + *(.rodata1) + _erodata = .; + } > sdram + + .data : + { + . = ALIGN(4); + _fdata = .; + *(.data .data.* .gnu.linkonce.d.*) + *(.data1) + _gp = ALIGN(16); + *(.sdata .sdata.* .gnu.linkonce.s.*) + _edata = .; + } > sdram + + .bss : + { + . = ALIGN(4); + _fbss = .; + *(.dynsbss) + *(.sbss .sbss.* .gnu.linkonce.sb.*) + *(.scommon) + *(.dynbss) + *(.bss .bss.* .gnu.linkonce.b.*) + *(COMMON) + . = ALIGN(4); + _ebss = .; + . = ALIGN(8); + _heapstart = .; + } > sdram +} + +PROVIDE(_fstack = ORIGIN(sdram) + LENGTH(sdram) - 4); diff --git a/software/videomixer/main.c b/software/videomixer/main.c new file mode 100644 index 00000000..e00e497f --- /dev/null +++ b/software/videomixer/main.c @@ -0,0 +1,17 @@ +#include + +#include +#include + +int main(void) +{ + irq_setmask(0); + irq_setie(1); + uart_init(); + + puts("Minimal video mixer software built "__DATE__" "__TIME__"\n"); + + while(1); + + return 0; +}