109550206 lab3, 4

lab3/.gitignore

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+tmp
+book
+build
+*.elf
+*.img

lab3/Makefile

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+shell = /bin/bash
+CROSS_COMPILER := aarch64-linux-gnu-
+CC := $(CROSS_COMPILER)gcc
+LD := $(CROSS_COMPILER)ld
+OC := $(CROSS_COMPILER)objcopy
+BUILD_DIR := build
+SRC_DIR := src
+LIB_DIR := $(SRC_DIR)/lib
+KERNEL_DIR := $(SRC_DIR)/kernel
+BOOTLOADER_DIR := $(SRC_DIR)/bootloader
+KERNEL_SRCS := $(shell cd src; find kernel lib -name '*.[cs]')
+KERNEL_OBJS := $(KERNEL_SRCS:%=$(BUILD_DIR)/%.o)
+BOOTLOADER_SRCS := $(shell cd src; find bootloader lib -name '*.[cs]')
+BOOTLOADER_OBJS := $(BOOTLOADER_SRCS:%=$(BUILD_DIR)/%.o)
+
+KERNEL_CFLAGS := -I $(KERNEL_DIR)/include
+BOOTLOADER_CFLAGS := -I $(BOOTLOADER_DIR)/include
+CFLAGS := -O0 -I $(LIB_DIR)/include -fno-stack-protector -ffreestanding -fdata-sections -ffunction-sections -g
+
+.PHONY : all clean rootfs test debug
+
+all: kernel8.img
+
+clean:
+	rm -rf build kernel8.img kernel8.elf
+
+rootfs:
+	cd rootfs && find . | cpio -o -H newc > ../raspi3b/initramfs.cpio
+
+test:
+	qemu-system-aarch64 -M raspi3b -kernel bootloader.img -initrd raspi3b/initramfs.cpio -dtb raspi3b/bcm2710-rpi-3-b-plus.dtb -serial null -serial pty -display none
+
+debug:
+	qemu-system-aarch64 -M raspi3b -kernel bootloader.img -initrd raspi3b/initramfs.cpio -dtb raspi3b/bcm2710-rpi-3-b-plus.dtb -serial null -serial pty -display none -S -s
+
+kernel8.img: $(KERNEL_OBJS)
+	$(LD) -T $(KERNEL_DIR)/linker.ld -o kernel8.elf $^
+	$(OC) -O binary kernel8.elf kernel8.img
+
+bootloader.img: $(BOOTLOADER_OBJS)
+	$(LD) -T $(BOOTLOADER_DIR)/linker.ld -o bootloader.elf $^ --gc-sections
+	$(OC) -O binary bootloader.elf bootloader.img
+
+$(BUILD_DIR)/kernel/%.c.o: $(KERNEL_DIR)/%.c 
+	mkdir -p $(dir $@)
+	$(CC) $(KERNEL_CFLAGS) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/kernel/%.s.o: $(KERNEL_DIR)/%.s
+	mkdir -p $(dir $@)
+	$(CC) $(KERNEL_CFLAGS) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/bootloader/%.c.o: $(BOOTLOADER_DIR)/%.c 
+	mkdir -p $(dir $@)
+	$(CC) $(BOOTLOADER_CFLAGS) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/bootloader/%.s.o: $(BOOTLOADER_DIR)/%.s
+	mkdir -p $(dir $@)
+	$(CC) $(BOOTLOADER_CFLAGS) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/lib/%.c.o: $(LIB_DIR)/%.c
+	mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/lib/%.s.o: $(LIB_DIR)/%.s
+	mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $@

lab3/README.md

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+# OS
+
+Physical Environment: Raspberry Pi 3b+
+
+Simulate Environment: QEMU
+
+Build Command:
+```
+make
+```
+
+Simulate Command:
+```
+qemu-system-aarch64 -M raspi3b -kernel kernel8.img -serial null -serial stdio -display none
+```

lab3/raspi3b/config.txt

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+kernel=bootloader.img
+arm_64bit=1
+initramfs initramfs.cpio 0x20000000

lab3/rootfs/file1

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+this is file1.

lab3/rootfs/file2.txt

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+this is file2.

lab3/src/bootloader/bootloader.c

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+#include <bootloader.h>
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include <uart.h>
+#include <utils.h>
+#include <string.h>
+
+extern uint32_t _bss_begin;
+extern uint32_t _bss_end;
+extern uint32_t _stack_top;
+
+void _init(void){
+	for(uint32_t*addr = &_bss_begin; addr != &_bss_end; addr++){
+		*addr = 0;
+	}
+	uart_init();
+	load_kernel();
+}
+
+void load_kernel(){
+	char *kernel_addr = (char *)0x80000;
+	uart_print("Input Size: ");
+	char buf[BUF_SIZE];
+	size_t recvlen = uart_readline(buf);
+	buf[recvlen] = '\0';
+	uint32_t imagesize = atoi(buf);
+	uart_print("Input Kernel Image (Size: ");
+	uart_print_hex(imagesize, 32);
+	uart_print("): ");
+	uart_read(kernel_addr, imagesize);
+	uart_print("Go to kernel!");
+	newline();
+	asm volatile(
+		"mov x0, x10\n"
+		"ldr x1, =0x80000\n"
+    	"br x1\n"
+    );
+}

lab3/src/bootloader/include/bootloader.h

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+#ifndef __KERNEL__
+#define __KERNEL__
+#define BUF_SIZE 0x20
+void load_kernel();
+void _init();
+#endif

lab3/src/bootloader/linker.ld

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+ENTRY(_start)
+MEMORY
+{
+	BOOTLOADER (rx) : ORIGIN = 0x20000, LENGTH = 128K
+	CODE (rx) : ORIGIN = 0x80000, LENGTH = 128K
+	ROM (r) : ORIGIN = 0xa0000, LENGTH = 128K
+	RAM (rw) : ORIGIN = 0xc0000, LENGTH = 512K
+}
+SECTIONS
+{
+	.text :
+	{ 
+		_loader_begin = .;
+  		*(.text.start)
+		*(.text.loader)
+		*(.text)
+	} >CODE
+	.rodata :
+	{
+		_rodata_begin = .;
+		*(.rodata)
+		_rodata_end = .;
+	} >ROM
+	.data :
+	{
+		_data_begin = .;
+		*(.data)
+		_data_end = .;
+	} >RAM
+	.bss : {
+		. = ALIGN(0x8);
+		_bss_begin = .;
+		*(.bss)
+		_bss_end = .;
+		_loader_end = .;
+	} >RAM
+	_stack_top = ORIGIN(RAM) + LENGTH(RAM);
+	_bootloader_begin = ORIGIN(BOOTLOADER);
+	_loader_size = _loader_end - _loader_begin;
+	_kernel_begin = ORIGIN(CODE);
+}

lab3/src/bootloader/start.s

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+.section ".text.start"
+.extern _stack_top
+.extern _bootloader_begin
+.extern _kernel_begin
+.extern _loader_size
+.extern _init
+.global _start
+_start:
+	mov x10, x0
+	adrp x0, _stack_top
+	mov sp, x0
+	adrp x0, _kernel_begin
+	adrp x1, _bootloader_begin
+	adrp x2, _loader_size
+	_loop:
+		ldr x4, [x0], #8
+		str x4, [x1], #8
+		subs x2, x2, #8
+		b.gt _loop
+	b #(_init - 0x60000)

lab3/src/exec/Makefile

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+CROSS_COMPILE = aarch64-linux-gnu-
+CC := $(CROSS_COMPILE)gcc
+LD := $(CROSS_COMPILE)ld
+
+.PHONY: clean
+
+CFLAGS := -O0 -fno-stack-protector -ffreestanding -fdata-sections -ffunction-sections
+
+test_el0_exception: test_el0_exception.s.o
+	$(LD) -T linker.ld $^ -o test_el0_exception.elf
+	$(CROSS_COMPILE)objcopy -O binary test_el0_exception.elf test_el0_exception
+	cp $@ ../../rootfs
+
+test_el0_exception.s.o: main.s
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	rm test_el0_exception.elf test_el0_exception test_el0_exception.s.o

lab3/src/exec/linker.ld

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+ENTRY(_start)
+
+SECTIONS
+{
+    .text : { 
+        *(.text.start)
+        *(.text)
+    }
+    .rodata : {
+        *(.rodata)
+    }
+    .data : {
+        *(.data)
+    }
+    .bss : {
+        *(.bss)
+    }
+}

lab3/src/exec/main.s

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+.section ".text.start"
+.global _start
+_start:
+    mov x0, 0
+1:
+    add x0, x0, 1
+    svc 0
+    cmp x0, 5
+    blt 1b
+1:
+    b 1b

lab3/src/kernel/include/kernel.h

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+#ifndef __KERNEL__
+#define __KERNEL__
+#define BUF_SIZE 256
+void _init();
+void boot_message();
+void allocator_test();
+void devicetree_check();
+void spsr_el1_check();
+void boottimer();
+#endif