BIOS: hello world
This commit is contained in:
Sebastien Bourdeauducq
parent
33da32417a
commit
45529d5941
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@ -0,0 +1,30 @@
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M2DIR=../..
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include $(M2DIR)/software/include.mak
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OBJECTS=crt0.o isr.o main.o
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all: bios.bin
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# pull in dependency info for *existing* .o files
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-include $(OBJECTS:.o=.d)
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%.bin: %.elf
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$(MAKE) -C $(M2DIR)/tools
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$(OBJCOPY) -O binary $< $@
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chmod -x $@
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$(M2DIR)/tools/mkmmimg $@ write
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bios.elf: linker.ld $(OBJECTS) libs
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bios-rescue.elf: linker-rescue.ld $(OBJECTS) libs
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%.elf:
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$(LD) $(LDFLAGS) -T $< -N -o $@ $(OBJECTS) -L$(M2DIR)/software/libbase -lbase
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chmod -x $@
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libs:
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make -C $(M2DIR)/software/libbase
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.PHONY: clean libs
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clean:
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rm -f $(OBJECTS) $(OBJECTS:.o=.d) bios.elf bios.bin bios-rescue.elf bios-rescue.bin .*~ *~
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@ -0,0 +1,167 @@
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/*
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* LatticeMico32 C startup code.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Exception handlers - Must be 32 bytes long. */
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.section .text, "ax", @progbits
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.global _start
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_start:
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_reset_handler:
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xor r0, r0, r0
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wcsr IE, r0
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mvhi r1, hi(_reset_handler)
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ori r1, r1, lo(_reset_handler)
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wcsr EBA, r1
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bi _crt0
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nop
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nop
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_breakpoint_handler:
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bi _breakpoint_handler
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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_instruction_bus_error_handler:
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bi _instruction_bus_error_handler
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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_watchpoint_hander:
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bi _watchpoint_hander
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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_data_bus_error_handler:
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bi _data_bus_error_handler
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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_divide_by_zero_handler:
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bi _divide_by_zero_handler
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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_interrupt_handler:
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sw (sp+0), ra
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calli .save_all
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calli isr
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bi .restore_all_and_eret
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nop
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nop
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nop
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nop
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macaddress:
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.byte 0x10
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.byte 0xe2
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.byte 0xd5
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.byte 0x00
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.byte 0x00
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.byte 0x00
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/* padding to align to a 32-bit boundary */
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.byte 0x00
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.byte 0x00
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_crt0:
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/* Setup stack and global pointer */
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mvhi sp, hi(_fstack)
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ori sp, sp, lo(_fstack)
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mvhi gp, hi(_gp)
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ori gp, gp, lo(_gp)
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/* Clear BSS */
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mvhi r1, hi(_fbss)
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ori r1, r1, lo(_fbss)
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mvhi r3, hi(_ebss)
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ori r3, r3, lo(_ebss)
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.clearBSS:
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be r1, r3, .callMain
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sw (r1+0), r0
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addi r1, r1, 4
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bi .clearBSS
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.callMain:
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bi main
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.save_all:
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addi sp, sp, -56
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sw (sp+4), r1
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sw (sp+8), r2
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sw (sp+12), r3
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sw (sp+16), r4
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sw (sp+20), r5
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sw (sp+24), r6
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sw (sp+28), r7
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sw (sp+32), r8
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sw (sp+36), r9
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sw (sp+40), r10
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sw (sp+48), ea
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sw (sp+52), ba
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/* ra needs to be moved from initial stack location */
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lw r1, (sp+56)
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sw (sp+44), r1
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ret
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.restore_all_and_eret:
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lw r1, (sp+4)
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lw r2, (sp+8)
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lw r3, (sp+12)
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lw r4, (sp+16)
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lw r5, (sp+20)
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lw r6, (sp+24)
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lw r7, (sp+28)
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lw r8, (sp+32)
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lw r9, (sp+36)
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lw r10, (sp+40)
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lw ra, (sp+44)
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lw ea, (sp+48)
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lw ba, (sp+52)
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addi sp, sp, 56
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eret
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@ -0,0 +1,25 @@
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/*
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* Milkymist SoC (Software)
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* Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <hw/interrupts.h>
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#include <irq.h>
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void isr(void)
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{
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unsigned int irqs;
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irqs = irq_pending() & irq_getmask();
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}
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@ -0,0 +1,57 @@
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OUTPUT_FORMAT("elf32-lm32")
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ENTRY(_start)
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__DYNAMIC = 0;
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MEMORY {
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flash : ORIGIN = 0x00860000, LENGTH = 0x20000 /* 128K */
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sram : ORIGIN = 0x10000000, LENGTH = 0x01000 /* 4K */
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}
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SECTIONS
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{
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.text :
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{
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_ftext = .;
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*(.text .stub .text.* .gnu.linkonce.t.*)
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_etext = .;
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} > flash
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.rodata :
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{
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. = ALIGN(4);
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_frodata = .;
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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*(.rodata1)
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_erodata = .;
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} > flash
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/* We shouldn't have a .data section, but the GNU crapchain whines if we don't */
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.data :
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{
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. = ALIGN(4);
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_fdata = .;
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*(.data .data.* .gnu.linkonce.d.*)
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*(.data1)
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_gp = ALIGN(16);
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*(.sdata .sdata.* .gnu.linkonce.s.*)
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_edata = .;
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} > flash
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.bss :
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{
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. = ALIGN(4);
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_fbss = .;
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*(.dynsbss)
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*(.sbss .sbss.* .gnu.linkonce.sb.*)
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*(.scommon)
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*(.dynbss)
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*(.bss .bss.* .gnu.linkonce.b.*)
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*(COMMON)
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. = ALIGN(4);
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_ebss = .;
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_end = .;
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} > sram
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}
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PROVIDE(_fstack = ORIGIN(sram) + LENGTH(sram) - 4);
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@ -0,0 +1,16 @@
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#include <hw/uart.h>
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static void print(const char *s)
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{
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while(*s) {
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while(!(CSR_UART_STAT & UART_STAT_THRE));
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CSR_UART_RXTX = *s;
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s++;
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}
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}
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int main(void)
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{
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print("Hello World\n");
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while(1);
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}
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@ -34,8 +34,8 @@ endif
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# Toolchain options
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#
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INCLUDES_NOLIBC ?= -nostdinc -I$(MMDIR)/software/include/base
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INCLUDES = $(INCLUDES_NOLIBC) -I$(MMDIR)/software/include -I$(MMDIR)/tools
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INCLUDES_NOLIBC ?= -nostdinc -I$(M2DIR)/software/include/base
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INCLUDES = $(INCLUDES_NOLIBC) -I$(M2DIR)/software/include -I$(M2DIR)/tools
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ASFLAGS = $(INCLUDES) -nostdinc
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# later: -Wmissing-prototypes
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CFLAGS = -O9 -Wall -Wstrict-prototypes -Wold-style-definition -Wshadow \
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@ -1,13 +1,13 @@
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MMDIR=../..
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include $(MMDIR)/software/include.mak
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M2DIR=../..
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include $(M2DIR)/software/include.mak
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OBJECTS=divsi3.o libc.o console.o system.o board.o uart.o softfloat.o softfloat-glue.o vsnprintf.o atof.o
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all: libbase.a
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# pull in dependency info for *existing* .o files
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-include $(OBJECTS:.o=.d)
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all: libbase.a
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libbase.a: $(OBJECTS)
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$(AR) clr libbase.a $(OBJECTS)
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$(RANLIB) libbase.a
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@ -15,4 +15,4 @@ libbase.a: $(OBJECTS)
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.PHONY: clean
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clean:
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rm -f $(OBJECTS) $(OBJECTS:.o=.d) libbase.a .*~ *~ Makefile.bak
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rm -f $(OBJECTS) $(OBJECTS:.o=.d) libbase.a .*~ *~
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