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  • 8 files changed
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6 .gitignore
@@ -1,2 +1,8 @@
__pycache__
build/*
+*.o
+*.d
+*.a
+tools/bin2hex
+tools/flterm
+tools/mkmmimg
View
30 software/bios/Makefile
@@ -0,0 +1,30 @@
+M2DIR=../..
+include $(M2DIR)/software/include.mak
+
+OBJECTS=crt0.o isr.o main.o
+
+all: bios.bin
+
+# pull in dependency info for *existing* .o files
+-include $(OBJECTS:.o=.d)
+
+%.bin: %.elf
+ $(MAKE) -C $(M2DIR)/tools
+ $(OBJCOPY) -O binary $< $@
+ chmod -x $@
+ $(M2DIR)/tools/mkmmimg $@ write
+
+bios.elf: linker.ld $(OBJECTS) libs
+bios-rescue.elf: linker-rescue.ld $(OBJECTS) libs
+
+%.elf:
+ $(LD) $(LDFLAGS) -T $< -N -o $@ $(OBJECTS) -L$(M2DIR)/software/libbase -lbase
+ chmod -x $@
+
+libs:
+ make -C $(M2DIR)/software/libbase
+
+.PHONY: clean libs
+
+clean:
+ rm -f $(OBJECTS) $(OBJECTS:.o=.d) bios.elf bios.bin bios-rescue.elf bios-rescue.bin .*~ *~
View
167 software/bios/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
View
25 software/bios/isr.c
@@ -0,0 +1,25 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
+ *
+ * This program 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, version 3 of the License.
+ *
+ * This program 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 program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <hw/interrupts.h>
+#include <irq.h>
+
+void isr(void)
+{
+ unsigned int irqs;
+ irqs = irq_pending() & irq_getmask();
+}
View
57 software/bios/linker.ld
@@ -0,0 +1,57 @@
+OUTPUT_FORMAT("elf32-lm32")
+ENTRY(_start)
+
+__DYNAMIC = 0;
+
+MEMORY {
+ flash : ORIGIN = 0x00860000, LENGTH = 0x20000 /* 128K */
+ sram : ORIGIN = 0x10000000, LENGTH = 0x01000 /* 4K */
+}
+
+SECTIONS
+{
+ .text :
+ {
+ _ftext = .;
+ *(.text .stub .text.* .gnu.linkonce.t.*)
+ _etext = .;
+ } > flash
+
+ .rodata :
+ {
+ . = ALIGN(4);
+ _frodata = .;
+ *(.rodata .rodata.* .gnu.linkonce.r.*)
+ *(.rodata1)
+ _erodata = .;
+ } > flash
+
+ /* We shouldn't have a .data section, but the GNU crapchain whines if we don't */
+ .data :
+ {
+ . = ALIGN(4);
+ _fdata = .;
+ *(.data .data.* .gnu.linkonce.d.*)
+ *(.data1)
+ _gp = ALIGN(16);
+ *(.sdata .sdata.* .gnu.linkonce.s.*)
+ _edata = .;
+ } > flash
+
+ .bss :
+ {
+ . = ALIGN(4);
+ _fbss = .;
+ *(.dynsbss)
+ *(.sbss .sbss.* .gnu.linkonce.sb.*)
+ *(.scommon)
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ *(COMMON)
+ . = ALIGN(4);
+ _ebss = .;
+ _end = .;
+ } > sram
+}
+
+PROVIDE(_fstack = ORIGIN(sram) + LENGTH(sram) - 4);
View
16 software/bios/main.c
@@ -0,0 +1,16 @@
+#include <hw/uart.h>
+
+static void print(const char *s)
+{
+ while(*s) {
+ while(!(CSR_UART_STAT & UART_STAT_THRE));
+ CSR_UART_RXTX = *s;
+ s++;
+ }
+}
+
+int main(void)
+{
+ print("Hello World\n");
+ while(1);
+}
View
4 software/include.mak
@@ -34,8 +34,8 @@ endif
# Toolchain options
#
-INCLUDES_NOLIBC ?= -nostdinc -I$(MMDIR)/software/include/base
-INCLUDES = $(INCLUDES_NOLIBC) -I$(MMDIR)/software/include -I$(MMDIR)/tools
+INCLUDES_NOLIBC ?= -nostdinc -I$(M2DIR)/software/include/base
+INCLUDES = $(INCLUDES_NOLIBC) -I$(M2DIR)/software/include -I$(M2DIR)/tools
ASFLAGS = $(INCLUDES) -nostdinc
# later: -Wmissing-prototypes
CFLAGS = -O9 -Wall -Wstrict-prototypes -Wold-style-definition -Wshadow \
View
10 software/libbase/Makefile
@@ -1,13 +1,13 @@
-MMDIR=../..
-include $(MMDIR)/software/include.mak
+M2DIR=../..
+include $(M2DIR)/software/include.mak
OBJECTS=divsi3.o libc.o console.o system.o board.o uart.o softfloat.o softfloat-glue.o vsnprintf.o atof.o
+all: libbase.a
+
# pull in dependency info for *existing* .o files
-include $(OBJECTS:.o=.d)
-all: libbase.a
-
libbase.a: $(OBJECTS)
$(AR) clr libbase.a $(OBJECTS)
$(RANLIB) libbase.a
@@ -15,4 +15,4 @@ libbase.a: $(OBJECTS)
.PHONY: clean
clean:
- rm -f $(OBJECTS) $(OBJECTS:.o=.d) libbase.a .*~ *~ Makefile.bak
+ rm -f $(OBJECTS) $(OBJECTS:.o=.d) libbase.a .*~ *~

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