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Merge pull request #1 from Po-Shun/LAB1
LAB1 finish
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‎Makefile‎

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ARMPATH = /Users/stafen/Documents/osc/toolchain/arm-gnu-toolchain-12.2.rel1-darwin-x86_64-aarch64-none-elf/bin
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ARMGCC ?= $(ARMPATH)/aarch64-none-elf-gcc
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ARMLD ?= $(ARMPATH)/aarch64-none-elf-ld
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ARMOBJCOPY ?= $(ARMPATH)/aarch64-none-elf-objcopy
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CFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles -Iinclude
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ASMOPS = -Iinclude
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BUILD_DIR=out
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SRC_DIR=src
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all: kernel8.img
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clean:
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rm -rf $(BUILD_DIR) *.img
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$(BUILD_DIR)/%_c.o: $(SRC_DIR)/%.c
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mkdir -p $(@D)
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$(ARMGCC) $(CFLAGS) -c $< -o $@
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$(BUILD_DIR)/%_s.o: $(SRC_DIR)/%.S
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$(ARMGCC) $(CFLAGS) -c $< -o $@
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C_FILES = $(wildcard $(SRC_DIR)/*.c)
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ASM_FILES = $(wildcard $(SRC_DIR)/*.S)
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OBJ_FILES = $(C_FILES:$(SRC_DIR)/%.c=$(BUILD_DIR)/%_c.o)
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OBJ_FILES += $(ASM_FILES:$(SRC_DIR)/%.S=$(BUILD_DIR)/%_s.o)
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kernel8.img: $(SRC_DIR)/linker.ld $(OBJ_FILES)
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$(ARMLD) -T $(SRC_DIR)/linker.ld -o $(BUILD_DIR)/kernel8.elf $(OBJ_FILES)
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$(ARMOBJCOPY) $(BUILD_DIR)/kernel8.elf -O binary kernel8.img
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run:
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qemu-system-aarch64 -M raspi3b -kernel kernel8.img -serial null -serial stdio
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deploy:
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rm /Volumes/NO\ NAME/kernel8.img
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cp kernel8.img /Volumes/NO\ NAME

‎README.md‎

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# OSC2023
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| Github Account | Student ID | Name |
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|----------------|------------|---------------|
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| Po-Shun | 0716089 | 王柏舜 |
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## Requirements
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* a cross-compiler for aarch64
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* qemu-system-arm
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## Build
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```
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make all
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```
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## qemu
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```
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make run
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```
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## Test With QEMU
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```
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make run
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```

‎include/command.h‎

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enum command{
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CMD_HELP,
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CMD_HELLO,
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CMD_REBOOT,
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CMD_INVAILD = -1
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};

‎include/gpio.h‎

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#define MMIO_BASE 0x3F000000
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#define GPFSEL0 ((volatile unsigned int*)(MMIO_BASE+0x00200000))
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#define GPFSEL1 ((volatile unsigned int*)(MMIO_BASE+0x00200004))
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#define GPFSEL2 ((volatile unsigned int*)(MMIO_BASE+0x00200008))
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#define GPFSEL3 ((volatile unsigned int*)(MMIO_BASE+0x0020000C))
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#define GPFSEL4 ((volatile unsigned int*)(MMIO_BASE+0x00200010))
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#define GPFSEL5 ((volatile unsigned int*)(MMIO_BASE+0x00200014))
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#define GPSET0 ((volatile unsigned int*)(MMIO_BASE+0x0020001C))
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#define GPSET1 ((volatile unsigned int*)(MMIO_BASE+0x00200020))
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#define GPCLR0 ((volatile unsigned int*)(MMIO_BASE+0x00200028))
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#define GPLEV0 ((volatile unsigned int*)(MMIO_BASE+0x00200034))
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#define GPLEV1 ((volatile unsigned int*)(MMIO_BASE+0x00200038))
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#define GPEDS0 ((volatile unsigned int*)(MMIO_BASE+0x00200040))
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#define GPEDS1 ((volatile unsigned int*)(MMIO_BASE+0x00200044))
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#define GPHEN0 ((volatile unsigned int*)(MMIO_BASE+0x00200064))
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#define GPHEN1 ((volatile unsigned int*)(MMIO_BASE+0x00200068))
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#define GPPUD ((volatile unsigned int*)(MMIO_BASE+0x00200094))
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#define GPPUDCLK0 ((volatile unsigned int*)(MMIO_BASE+0x00200098))
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#define GPPUDCLK1 ((volatile unsigned int*)(MMIO_BASE+0x0020009C))

‎include/mailbox.h‎

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#define MMIO_BASE 0x3f000000
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#define MAILBOX_BASE MMIO_BASE + 0xb880
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#define GET_BOARD_REVISION 0x00010002
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#define GET_ARM_MEMORY 0x00010005
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#define REQUEST_CODE 0x00000000
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#define REQUEST_SUCCEED 0x80000000
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#define REQUEST_FAILED 0x80000001
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#define TAG_REQUEST_CODE 0x00000000
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#define END_TAG 0x00000000
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#define VIDEOCORE_MAILBOX (MMIO_BASE + 0x0000B880)
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#define MAILBOX_READ ((volatile unsigned int*)(VIDEOCORE_MAILBOX + 0x0))
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#define MAILBOX_POLL ((volatile unsigned int*)(VIDEOCORE_MAILBOX + 0x10))
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#define MAILBOX_SENDER ((volatile unsigned int*)(VIDEOCORE_MAILBOX + 0x14))
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#define MAILBOX_STATUS ((volatile unsigned int*)(VIDEOCORE_MAILBOX + 0x18))
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#define MAILBOX_CONFIG ((volatile unsigned int*)(VIDEOCORE_MAILBOX + 0x1C))
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#define MAILBOX_WRITE ((volatile unsigned int*)(VIDEOCORE_MAILBOX + 0x20))
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#define MAILBOX_RESPONSE 0x80000000
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#define MAILBOX_FULL 0x80000000
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#define MAILBOX_EMPTY 0x40000000
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#define CHANNEL_8 8
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void get_board_revision(unsigned int* revision);
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void get_arm_memory(unsigned int* base, unsigned int* size);

‎include/reboot.h‎

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#define PM_PASSWORD 0x5a000000
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#define PM_RSTC 0x3F10001c
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#define PM_WDOG 0x3F100024
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void reset(int tick);

‎include/uart.h‎

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void uart_init();
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void uart_send(unsigned int c);
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char uart_getc();
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void uart_puts(char *s);
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void uart_hex(unsigned int d);

‎src/boot.S‎

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.section ".text.boot"
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.global _start
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_start:
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// read cpu id, stop slave cores
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mrs x1, mpidr_el1
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// # means constant 11(binary) = 3
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and x1, x1, #3
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// f for froward(down) and b for backward(up)
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cbz x1, 2f
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// cpu id > 0, stop
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1:
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wfe
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b 1b
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2: // cpu id == 0
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// stack operation is "Full Descending" mode. Need set the top of the stack to the top of the stack space
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ldr x1, =_start
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mov sp, x1
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// clear bss
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ldr x1, =__bss_start
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ldr w2, =__bss_size
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3: cbz w2, 4f
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// xzr -> 64 bits zero reg , store 0 to x1 address then x1 = x1 + 8
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str xzr, [x1], #8
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sub w2, w2, #1
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cbnz w2, 3b
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// jump to C code, should not return
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4: bl main
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// for failsafe, halt this core too
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b 1b

‎src/linker.ld‎

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SECTIONS
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{
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. = 0x80000;
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.text.boot : { *(.text.boot) }
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.text : { *(.text .text.* .gnu.linkonce.t*) }
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.rodata : { *(.rodata .rodata.* .gnu.linkonce.r*) }
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.data : { *(.data .data.* .gnu.linkonce.d*) }
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.bss (NOLOAD) : {
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. = ALIGN(16);
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__bss_start = .;
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*(.bss .bss.*)
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*(COMMON)
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__bss_end = .;
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}
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_end = .;
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/DISCARD/ : { *(.comment) *(.gnu*) *(.note*) *(.eh_frame*) }
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}
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__bss_size = (__bss_end - __bss_start) >>3;

‎src/maibox.c‎

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#include "mailbox.h"
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#include "uart.h"
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// the LSB 4 bits is for channl -> 0xf == 16 in decimal, set the address of buffer be mutiple of 16 leave the last four bits to be zeros.
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volatile unsigned int __attribute__((aligned(16))) mailbox[8];
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/*
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Mail box message flow:
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1.Combine the message address (upper 28 bits) with channel number (lower 4 bits)
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2.Check if Mailbox 0 status register’s full flag is set.
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3.If not, then you can write to Mailbox 1 Read/Write register.
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4.Check if Mailbox 0 status register’s empty flag is set.
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5.If not, then you can read from Mailbox 0 Read/Write register.
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6.Check if the value is the same as you wrote in step 1.
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*/
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int mailbox_call(){
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unsigned int addr =(((unsigned int)((unsigned long)&mailbox) & ~0xF) | (CHANNEL_8 & 0xF));
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while(1){
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if(*MAILBOX_STATUS != MAILBOX_FULL) break;
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}
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*MAILBOX_WRITE= addr;
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while(1){
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while(1){
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if(*MAILBOX_STATUS != MAILBOX_EMPTY) break;
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}
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if(addr == *MAILBOX_READ) return 1;
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}
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return 0;
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}
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void get_board_revision(unsigned int* revision){
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mailbox[0] = 7 * 4;
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mailbox[1] = REQUEST_CODE;
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mailbox[2] = GET_BOARD_REVISION;
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mailbox[3] = 4;
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mailbox[4] = TAG_REQUEST_CODE;
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mailbox[5] = 0;
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mailbox[6] = END_TAG;
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mailbox_call();
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*revision = mailbox[5];
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}
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void get_arm_memory(unsigned int* base, unsigned int* size){
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mailbox[0] = 8 * 4;
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mailbox[1] = REQUEST_CODE;
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mailbox[2] = GET_ARM_MEMORY;
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mailbox[3] = 8;
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mailbox[4] = TAG_REQUEST_CODE;
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mailbox[5] = 0;
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mailbox[6] = 0;
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mailbox[7] = END_TAG;
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mailbox_call();
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*base = mailbox[5];
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*size = mailbox[6];
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}
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