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Merge pull request #121 from gcrisis/master
complete exercise 1,2,3 in lesson01
2 parents f6e491d + f194969 commit 3b3fc8d

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‎exercises/lesson01/1/gcrisis/Makefile

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ARMGNU ?= aarch64-linux-gnu
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COPS = -Wall -nostdlib -nostartfiles -ffreestanding -Iinclude -mgeneral-regs-only
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ASMOPS = -Iinclude
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BUILD_DIR = build
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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 $(@D)
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$(ARMGNU)-gcc $(COPS) -MMD -c $< -o $@
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$(BUILD_DIR)/%_s.o: $(SRC_DIR)/%.S
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$(ARMGNU)-gcc $(ASMOPS) -MMD -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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DEP_FILES = $(OBJ_FILES:%.o=%.d)
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-include $(DEP_FILES)
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kernel8.img: $(SRC_DIR)/linker.ld $(OBJ_FILES)
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$(ARMGNU)-ld -T $(SRC_DIR)/linker.ld -o $(BUILD_DIR)/kernel8.elf $(OBJ_FILES)
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$(ARMGNU)-objcopy $(BUILD_DIR)/kernel8.elf -O binary kernel8.img
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‎exercises/lesson01/1/gcrisis/include/mini_uart.h

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#ifndef _MINI_UART_H
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#define _MINI_UART_H
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void uart_init (int baudrate );
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char uart_recv ( void );
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void uart_send ( char c );
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void uart_send_string(char* str);
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#endif /*_MINI_UART_H */

‎exercises/lesson01/1/gcrisis/include/mm.h

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#ifndef _MM_H
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#define _MM_H
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#define PAGE_SHIFT 12
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#define TABLE_SHIFT 9
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#define SECTION_SHIFT (PAGE_SHIFT + TABLE_SHIFT)
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#define SECTION_SIZE (1 << SECTION_SHIFT)
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#define LOW_MEMORY (2 * SECTION_SIZE)
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#ifndef __ASSEMBLER__
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void memzero(unsigned long src, unsigned long n);
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#endif
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#endif /*_MM_H */

‎exercises/lesson01/1/gcrisis/include/peripherals/base.h

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#ifndef _P_BASE_H
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#define _P_BASE_H
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#define PBASE 0x3F000000
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#endif /*_P_BASE_H */

‎exercises/lesson01/1/gcrisis/include/peripherals/gpio.h

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#ifndef _P_GPIO_H
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#define _P_GPIO_H
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#include "peripherals/base.h"
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#define GPFSEL1 (PBASE+0x00200004)
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#define GPSET0 (PBASE+0x0020001C)
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#define GPCLR0 (PBASE+0x00200028)
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#define GPPUD (PBASE+0x00200094)
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#define GPPUDCLK0 (PBASE+0x00200098)
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#endif /*_P_GPIO_H */

‎exercises/lesson01/1/gcrisis/include/peripherals/mini_uart.h

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#ifndef _P_MINI_UART_H
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#define _P_MINI_UART_H
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#include "peripherals/base.h"
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#define AUX_ENABLES (PBASE+0x00215004)
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#define AUX_MU_IO_REG (PBASE+0x00215040)
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#define AUX_MU_IER_REG (PBASE+0x00215044)
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#define AUX_MU_IIR_REG (PBASE+0x00215048)
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#define AUX_MU_LCR_REG (PBASE+0x0021504C)
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#define AUX_MU_MCR_REG (PBASE+0x00215050)
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#define AUX_MU_LSR_REG (PBASE+0x00215054)
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#define AUX_MU_MSR_REG (PBASE+0x00215058)
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#define AUX_MU_SCRATCH (PBASE+0x0021505C)
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#define AUX_MU_CNTL_REG (PBASE+0x00215060)
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#define AUX_MU_STAT_REG (PBASE+0x00215064)
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#define AUX_MU_BAUD_REG (PBASE+0x00215068)
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#endif /*_P_MINI_UART_H */

‎exercises/lesson01/1/gcrisis/include/utils.h

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#ifndef _BOOT_H
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#define _BOOT_H
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extern void delay ( unsigned long);
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extern void put32 ( unsigned long, unsigned int );
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extern unsigned int get32 ( unsigned long );
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#endif /*_BOOT_H */

‎exercises/lesson01/1/gcrisis/src/boot.S

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#include "mm.h"
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.section ".text.boot"
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.globl _start
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_start:
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mrs x0, mpidr_el1
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and x0, x0,#0xFF // Check processor id
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cbz x0, master // Hang for all non-primary CPU
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b proc_hang
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proc_hang:
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b proc_hang
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master:
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adr x0, bss_begin
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adr x1, bss_end
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sub x1, x1, x0
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bl memzero
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mov sp, #LOW_MEMORY
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bl kernel_main
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b proc_hang // should never come here

‎exercises/lesson01/1/gcrisis/src/config.txt

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kernel_old=1
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disable_commandline_tags=1

‎exercises/lesson01/1/gcrisis/src/kernel.c

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#include "mini_uart.h"
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void kernel_main(void)
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{
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uart_init(9600);
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uart_send_string("Hello, world!\r\n");
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while (1) {
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uart_send(uart_recv());
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}
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}

‎exercises/lesson01/1/gcrisis/src/linker.ld

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SECTIONS
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{
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.text.boot : { *(.text.boot)}
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.text :{ *(.text)}
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.rodata : {*(.rodata) }
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.data : {*(.data) }
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. = ALIGN(0x8);
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bss_begin =.;
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.bss : {*(.bss*) }
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bss_end =.;
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}

‎exercises/lesson01/1/gcrisis/src/mini_uart.c

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#include "utils.h"
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#include "peripherals/mini_uart.h"
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#include "peripherals/gpio.h"
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#define BAUD_REG_VAL(baud_rate) ((250000000/(baud_rate)/8-1)&0x0000ffff)
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void uart_send ( char c )
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{
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while(1) {
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if(get32(AUX_MU_LSR_REG)&0x20)
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break;
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}
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put32(AUX_MU_IO_REG,c);
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}
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char uart_recv ( void )
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{
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while(1) {
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if(get32(AUX_MU_LSR_REG)&0x01)
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break;
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}
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return(get32(AUX_MU_IO_REG)&0xFF);
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}
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void uart_send_string(char* str)
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{
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for (int i = 0; str[i] != '\0'; i ++) {
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uart_send((char)str[i]);
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}
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}
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void uart_init (int baudrate )
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{
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unsigned int selector;
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selector = get32(GPFSEL1);
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selector &= ~(7<<12); // clean gpio14
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selector |= 2<<12; // set alt5 for gpio14
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selector &= ~(7<<15); // clean gpio15
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selector |= 2<<15; // set alt5 for gpio15
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put32(GPFSEL1,selector);
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put32(GPPUD,0);
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delay(150);
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put32(GPPUDCLK0,(1<<14)|(1<<15));
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delay(150);
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put32(GPPUDCLK0,0);
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put32(AUX_ENABLES,1); //Enable mini uart (this also enables access to it registers)
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put32(AUX_MU_CNTL_REG,0); //Disable auto flow control and disable receiver and transmitter (for now)
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put32(AUX_MU_IER_REG,0); //Disable receive and transmit interrupts
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put32(AUX_MU_LCR_REG,3); //Enable 8 bit mode
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put32(AUX_MU_MCR_REG,0); //Set RTS line to be always high
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put32(AUX_MU_BAUD_REG,(int)BAUD_REG_VAL(baudrate)); //Set baud rate to baudrate
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put32(AUX_MU_CNTL_REG,3); //Finally, enable transmitter and receiver
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}

‎exercises/lesson01/1/gcrisis/src/mm.S

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.globl memzero
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memzero:
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str xzr, [x0], #8
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subs x1, x1, #8
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b.gt memzero
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ret

‎exercises/lesson01/1/gcrisis/src/utils.S

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.globl put32
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put32:
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str w1,[x0]
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ret
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.globl get32
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get32:
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ldr w0,[x0]
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ret
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.globl delay
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delay:
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subs x0, x0, #1
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bne delay
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ret

‎exercises/lesson01/2/gcrisis/Makefile

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ARMGNU ?= aarch64-linux-gnu
2+
3+
COPS = -Wall -nostdlib -nostartfiles -ffreestanding -Iinclude
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ASMOPS = -Iinclude
5+
6+
BUILD_DIR = build
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SRC_DIR = src
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9+
all : kernel8.img
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11+
clean:
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rm -rf $(BUILD_DIR) *.img
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14+
$(BUILD_DIR)/%_c.o: $(SRC_DIR)/%.c
15+
mkdir -p $(@D)
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$(ARMGNU)-gcc $(COPS) -MMD -c $< -o $@
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$(BUILD_DIR)/%_s.o: $(SRC_DIR)/%.S
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$(ARMGNU)-gcc $(ASMOPS) -MMD -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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DEP_FILES = $(OBJ_FILES:%.o=%.d)
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-include $(DEP_FILES)
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kernel8.img: $(SRC_DIR)/linker.ld $(OBJ_FILES)
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$(ARMGNU)-ld -T $(SRC_DIR)/linker.ld -o $(BUILD_DIR)/kernel8.elf $(OBJ_FILES)
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$(ARMGNU)-objcopy $(BUILD_DIR)/kernel8.elf -O binary kernel8.img
32+

‎exercises/lesson01/2/gcrisis/include/mm.h

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#ifndef _MM_H
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#define _MM_H
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#define PAGE_SHIFT 12
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#define TABLE_SHIFT 9
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#define SECTION_SHIFT (PAGE_SHIFT + TABLE_SHIFT)
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#define SECTION_SIZE (1 << SECTION_SHIFT)
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#define LOW_MEMORY (2 * SECTION_SIZE)
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#ifndef __ASSEMBLER__
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void memzero(unsigned long src, unsigned long n);
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#endif
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#endif /*_MM_H */

‎exercises/lesson01/2/gcrisis/include/peripherals/base.h

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#ifndef _P_BASE_H
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#define _P_BASE_H
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#define PBASE 0x3F000000
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#endif /*_P_BASE_H */

‎exercises/lesson01/2/gcrisis/include/peripherals/gpio.h

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#ifndef _P_GPIO_H
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#define _P_GPIO_H
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#include "peripherals/base.h"
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#define GPFSEL1 (PBASE+0x00200004)
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#define GPSET0 (PBASE+0x0020001C)
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#define GPCLR0 (PBASE+0x00200028)
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#define GPPUD (PBASE+0x00200094)
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#define GPPUDCLK0 (PBASE+0x00200098)
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#endif /*_P_GPIO_H */

‎exercises/lesson01/2/gcrisis/include/peripherals/uart.h

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#ifndef _P_UART_H
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#define _P_UART_H
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#include "peripherals/base.h"
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#define UART_DR (PBASE+0x00201000)
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#define UART_RSRECR (PBASE+0x00201004)
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#define UART_FR (PBASE+0x00201018)
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#define UART_IBRD (PBASE+0x00201024)
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#define UART_FBRD (PBASE+0x00201028)
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#define UART_LCRH (PBASE+0x0020102C)
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#define UART_CR (PBASE+0x00201030)
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#define UART_IFLS (PBASE+0x00201034)
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#define UART_IMSC (PBASE+0x00201038)
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#define UART_RIS (PBASE+0x0020103C)
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#define UART_MIS (PBASE+0x00201040)
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#define UART_ICR (PBASE+0x00201044)
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#define UART_DMACR (PBASE+0x00201048)
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#define UART_ITCR (PBASE+0x00201080)
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#define UART_ITIP (PBASE+0x00201084)
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#define UART_ITOP (PBASE+0x00201088)
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#define UART_TDR (PBASE+0x0020108C)
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#endif /*_P_UART_H */

‎exercises/lesson01/2/gcrisis/include/uart.h

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#ifndef _UART_H
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#define _UART_H
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void uart_init (int baudrate);
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char uart_recv ( void );
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void uart_send ( char c );
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void uart_send_string(char* str);
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#endif /*_UART_H */

‎exercises/lesson01/2/gcrisis/include/utils.h

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#ifndef _BOOT_H
2+
#define _BOOT_H
3+
4+
extern void delay ( unsigned long);
5+
extern void put32 ( unsigned long, unsigned int );
6+
extern unsigned int get32 ( unsigned long );
7+
8+
#endif /*_BOOT_H */

‎exercises/lesson01/2/gcrisis/src/boot.S

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#include "mm.h"
2+
3+
.section ".text.boot"
4+
5+
.globl _start
6+
_start:
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mrs x0, mpidr_el1
8+
and x0, x0,#0xFF // Check processor id
9+
cbz x0, master // Hang for all non-primary CPU
10+
b proc_hang
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12+
proc_hang:
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b proc_hang
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master:
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adr x0, bss_begin
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adr x1, bss_end
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sub x1, x1, x0
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bl memzero
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mov sp, #LOW_MEMORY
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bl kernel_main
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b proc_hang // should never come here

‎exercises/lesson01/2/gcrisis/src/config.txt

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kernel_old=1
2+
disable_commandline_tags=1

‎exercises/lesson01/2/gcrisis/src/kernel.c

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#include "uart.h"
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3+
void kernel_main(void)
4+
{
5+
uart_init(115200);
6+
uart_send_string("Hello, world!\r\n");
7+
8+
while (1) {
9+
uart_send(uart_recv());
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}
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}

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