Update environment
This commit is contained in:
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c95e490a21
commit
8718f035a5
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@ -0,0 +1,86 @@
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# environment
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AARCH64_TOOLCHAIN ?= aarch64-linux-gnu
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# Shortcuts
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CC=clang --target=aarch64-none-elf -mcpu=cortex-a57
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# CC=$(AARCH64_TOOLCHAIN)-gcc
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LD=$(AARCH64_TOOLCHAIN)-ld
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OBJCOPY=$(AARCH64_TOOLCHAIN)-objcopy --target elf64-littleaarch64
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CFLAGS += -O0
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CFLAGS += -g
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CFLAGS += -nostdlib
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CFLAGS += -march=armv8-a
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#CFLAGS += -std=c99
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#CFLAGS += -pedantic
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#CFLAGS += -Wall
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#CFLAGS += -Wmissing-prototypes
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#CFLAGS += -Wstrict-prototypes
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#CFLAGS += -Wold-style-definition
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BUILD_DIR=build
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# Files
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KERNEL_MEMMAP = sys/memmap
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KERNEL_SOURCES = \
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aarch64/boot.s \
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sys/main.c \
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sys/uart.c \
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KERNEL_LIST := $(wildcard $(KERNEL_SOURCES))
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KERNEL_OBJS := $(addsuffix .o, $(addprefix $(BUILD_DIR)/, ${KERNEL_LIST}))
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all: kernel
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# compilation
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kernel: $(BUILD_DIR)/kernel.elf # $(BUILD_DIR)/kernel.sym
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$(BUILD_DIR)/kernel.elf: $(KERNEL_OBJS)
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$(info linking target: $@)
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$(LD) -T$(KERNEL_MEMMAP) $^ -o $@
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$(info done: $@)
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$(BUILD_DIR)/kernel.bin: $(BUILD_DIR)/kernel.elf
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$(OBJCOPY) -O binary $< $@
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$(BUILD_DIR)/kernel.sym: $(BUILD_DIR)/kernel.elf
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$(OBJCOPY) --only-keep-debug $< $@
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$(OBJCOPY) --strip-debug $@
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$(BUILD_DIR)/%.o: %
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$(info compiling file: $<)
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@mkdir -p $(dir ./$(BUILD_DIR)/$<)
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$(CC) $(CFLAGS) -c $< -o $@
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.PHONY: clean run
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# helpers
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QEMU_CMD = \
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qemu-system-aarch64 \
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-cpu cortex-a57 \
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-machine type=virt \
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-nographic \
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-smp 4 \
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-m 4098 \
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-kernel build/kernel.elf \
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-serial stdio \
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-monitor none
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clean:
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rm -Rf ./$(BUILD_DIR)/*
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run: kernel
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$(QEMU_CMD)
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debug: kernel
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$(QEMU_CMD) -gdb tcp::1234 -S
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@ -0,0 +1,22 @@
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.global _boot
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.extern k_main
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_boot:
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mrs x0, mpidr_el1 // Check CPU ID
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mov x1, 0xC1000000
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bic x0, x0, x1
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cbz x0, set_stack
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b idle
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set_stack:
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ldr x30, =0x40001000
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mov sp, x30
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bl start
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start:
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mov x0, x30
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bl k_main
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idle: b idle
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@ -0,0 +1,25 @@
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.text
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.globl _start
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.extern k_main
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.extern stack_ptr
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_start:
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mrs x0, mpidr_el1 // Check CPU ID
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mov x1, 0xC1000000
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bic x0, x0, x1
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cbz x0, set_stack
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b idle
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set_stack:
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ldr x30, stack_ptr // defined in sys/memmap
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mov sp, x30
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bl start
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start:
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mov x0, x30
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bl k_main
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idle:
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b idle
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@ -1,34 +0,0 @@
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ASM=clang
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TARGET=aarch64-none-elf
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CPU=cortex-a57
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LD=ld.lld
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OBJCOPY=objcopy --target elf64-littleaarch64
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all: build/core.bin build/core.elf
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# compilation -----------------------------------------------------------------
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build/core.o: core/core.s
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$(ASM) -c -triple --target=$(TARGET) -mcpu=$(CPU) -O0 -g $< -o $@
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build/uart.o: core/uart.s
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$(ASM) -c --target=$(TARGET) -mcpu=$(CPU) -O0 -g $< -o $@
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# ELF -------------------------------------------------------------------------
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build/core.elf: build/core.o build/uart.o
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$(LD) -Tcore/core.ld $^ -o $@
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# BIN -------------------------------------------------------------------------
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build/core.bin: build/core.elf
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$(OBJCOPY) -O binary $< $@
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build/core.sym: build/core.elf
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$(OBJCOPY) --only-keep-debug $< $@
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$(OBJCOPY) --strip-debug build/core.elf
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# Clean -----------------------------------------------------------------------
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clean:
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rm -f build/*
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@ -1,12 +0,0 @@
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ENTRY(_core_init)
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SECTIONS
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{
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. = 0x40000000;
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.text : { *(.text) }
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.data : { *(.text) }
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.bss : { *(.bss COMMON) }
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. = ALIGN(10);
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. = . + 0x1000;
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stack_ptr = . ;
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}
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@ -1,93 +0,0 @@
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# file : uart.s
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# project : Löwe OS
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# authors : Elias Löwe <elias@lowenware.com>
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# address of UART for virt device in qemu
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# -----------------------------------------------------------------------------
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.global _uart_putc # print single character uart
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.global _uart_putx # print integer in HEX format to uart
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.global _uart_puts # print null-terminated string to uart
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# -----------------------------------------------------------------------------
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.text
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# helper to avoid extra data moving
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# @x1 character print
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uart_putc:
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STP x2, lr, [sp, -16]!
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MOV x2, 0x09000000 # set UART address
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STRB w1, [x2] # put character out
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LDP x2, lr, [sp], 16
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RET
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# -----------------------------------------------------------------------------
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# print character to uart
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# @x0 character print
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_uart_putc:
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STR lr, [sp, -16]!
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MOV x1, x0 # set arguments
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BL uart_putc # put character out
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LDR lr, [sp], 16
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RET
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# -----------------------------------------------------------------------------
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# @x0 integer to print
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_uart_putx:
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STP lr, x3, [sp, -32]!
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STP x0, x1, [sp, 16]
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LDR x3, =60 # init bits counter 64-4
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1:
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LSR x1, x0, x3 # shift to digit
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AND x1, x1, 0xF # keep only digit
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CMP x1, 9 # compare it to 9
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BLS 2f # less or equal
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ADD x1, x1, 0x37 # turn into ASCII HEX char
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B 3f # continue to output
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2:
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ADD x1, x1, 0x30 # turn into ASCII num char
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3:
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BL uart_putc # output carachter
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CBZ x3, 0f # if counter == 0 return
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SUB x3, x3, 4 # otherwise subtract counter by 4
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B 1b # repeat
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0:
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LDP lr, x3, [sp], 16
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LDP x0, x1, [sp], 16
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RET
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# -----------------------------------------------------------------------------
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# @x0 pointer to string
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_uart_puts:
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STR lr, [sp, -16]!
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STP x0, x1, [sp, -16]!
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1:
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LDRB w1, [x0], 1 # load byte of string from address in x0
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CBZ w1, 0f # return if zero
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BL uart_putc # put charcter out
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B 1b # loop
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0:
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LDP x0, x1, [sp], 16
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LDR lr, [sp], 16
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RET
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# -----------------------------------------------------------------------------
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/******************************************************************************
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*
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* Copyright (c) 2017-2019 by Löwenware Ltd
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* Please, refer LICENSE file for legal information
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*
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******************************************************************************/
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/**
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* @file main.c
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* @author Ilja Kartašov <ik@lowenware.com>
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* @brief
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*
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* @see https://lowenware.com/
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*/
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#include "uart.h"
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void
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k_main(void);
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void
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k_main(void)
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{
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uart_init();
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uart_putc('L');
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uart_putc('o');
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uart_putc('w');
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uart_putc('e');
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uart_putc('\n');
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for (;;) {
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}
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}
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ENTRY(_start)
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SECTIONS
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{
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. = 0x40000000;
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.text : { *(.text) }
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.data : { *(.data) }
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.bss : { *(.bss COMMON) }
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. = ALIGN(8);
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. = . + 0x1000;
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stack_ptr = . ;
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}
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/******************************************************************************
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*
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* Copyright (c) 2017-2019 by Löwenware Ltd
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* Please, refer LICENSE file for legal information
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*
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******************************************************************************/
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/**
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* @file uart.c
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* @author Ilja Kartašov <ik@lowenware.com>
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* @brief
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*
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* @see https://lowenware.com/
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*/
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#include "uart.h"
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unsigned int *uart_base = (unsigned int *)UART_BASE;
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void
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uart_init(void)
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{
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}
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void
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uart_putc(unsigned char c)
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{
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*uart_base = c;
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if(c == '\n')
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*uart_base = '\r';
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}
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/******************************************************************************
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*
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* Copyright (c) 2017-2019 by Löwenware Ltd
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* Please, refer LICENSE file for legal information
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*
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******************************************************************************/
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/**
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* @file uart.h
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* @author Ilja Kartašov <ik@lowenware.com>
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* @brief
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*
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* @see https://lowenware.com/
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*/
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#ifndef UART_H_8AFC47F9_2953_42C1_A5C1_1AE5A1F52CD0
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#define UART_H_8AFC47F9_2953_42C1_A5C1_1AE5A1F52CD0
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#define UART_BASE 0x09000000
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void
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uart_init(void);
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void
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uart_putc(unsigned char c);
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#endif /* !UART_H */
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@ -0,0 +1,93 @@
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// file : uart.s
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// project : Löwe OS
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// authors : Elias Löwe <elias@lowenware.com>
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// address of UART for virt device in qemu
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// -----------------------------------------------------------------------------
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.global _uart_putc // print single character uart
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.global _uart_putx // print integer in HEX format to uart
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.global _uart_puts // print null-terminated string to uart
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// -----------------------------------------------------------------------------
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.text
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// helper to avoid extra data moving
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// @x1 character print
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uart_putc:
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STP x2, lr, [sp, -16]!
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MOV x2, 0x09000000 // set UART address
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STRB w1, [x2] // put character out
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LDP x2, lr, [sp], 16
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RET
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// -----------------------------------------------------------------------------
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// print character to uart
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// @x0 character print
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_uart_putc:
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STR lr, [sp, -16]!
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MOV x1, x0 // set arguments
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BL uart_putc // put character out
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LDR lr, [sp], 16
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RET
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// -----------------------------------------------------------------------------
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// @x0 integer to print
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_uart_putx:
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STP lr, x3, [sp, -32]!
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STP x0, x1, [sp, 16]
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LDR x3, =60 // init bits counter 64-4
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1:
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LSR x1, x0, x3 // shift to digit
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AND x1, x1, 0xF // keep only digit
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CMP x1, 9 // compare it to 9
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BLS 2f // less or equal
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ADD x1, x1, 0x37 // turn into ASCII HEX char
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B 3f // continue to output
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2:
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ADD x1, x1, 0x30 // turn into ASCII num char
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3:
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BL uart_putc // output carachter
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CBZ x3, 0f // if counter == 0 return
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SUB x3, x3, 4 // otherwise subtract counter by 4
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B 1b // repeat
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0:
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LDP lr, x3, [sp], 16
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LDP x0, x1, [sp], 16
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RET
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// -----------------------------------------------------------------------------
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// @x0 pointer to string
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_uart_puts:
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STR lr, [sp, -16]!
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STP x0, x1, [sp, -16]!
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1:
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LDRB w1, [x0], 1 // load byte of string from address in x0
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CBZ w1, 0f // return if zero
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BL uart_putc // put charcter out
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B 1b // loop
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0:
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LDP x0, x1, [sp], 16
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LDR lr, [sp], 16
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RET
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// -----------------------------------------------------------------------------
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