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Merge pull request #224 from szediwy/master
Lesson 2 - Exercise 2 & Lesson 3 - Exercise 1,2
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‎exercises/lesson02/2/szediwy/Makefile‎

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ARMGNU ?= aarch64-linux-gnu
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COPS = -Wall -nostdlib -nostartfiles -ffreestanding -Iinclude
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ASMOPS = -Iinclude
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BUILD_DIR = build
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SRC_DIR = src
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.PHONY: clean
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all : kernel8.img
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clean :
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rm -rf $(BUILD_DIR) *.img
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@echo "clean: [SUCCESS]"
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$(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

‎exercises/lesson02/2/szediwy/build.bat‎

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docker run --rm -v %cd%:/app -w /app smatyukevich/raspberry-pi-os-builder make %1

‎exercises/lesson02/2/szediwy/build.sh‎

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#!/bin/bash
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docker run --rm -v $(pwd):/app -w /app smatyukevich/raspberry-pi-os-builder make $1

‎exercises/lesson02/2/szediwy/include/custom_printf.h‎

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/*
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File: printf.h
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Copyright (C) 2004 Kustaa Nyholm
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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This library is really just two files: 'printf.h' and 'printf.c'.
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They provide a simple and small (+200 loc) printf functionality to
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be used in embedded systems.
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I've found them so usefull in debugging that I do not bother with a
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debugger at all.
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They are distributed in source form, so to use them, just compile them
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into your project.
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Two printf variants are provided: printf and sprintf.
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The formats supported by this implementation are: 'd' 'u' 'c' 's' 'x' 'X'.
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Zero padding and field width are also supported.
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If the library is compiled with 'PRINTF_SUPPORT_LONG' defined then the
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long specifier is also
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supported. Note that this will pull in some long math routines (pun intended!)
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and thus make your executable noticably longer.
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The memory foot print of course depends on the target cpu, compiler and
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compiler options, but a rough guestimate (based on a H8S target) is about
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1.4 kB for code and some twenty 'int's and 'char's, say 60 bytes of stack space.
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Not too bad. Your milage may vary. By hacking the source code you can
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get rid of some hunred bytes, I'm sure, but personally I feel the balance of
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functionality and flexibility versus code size is close to optimal for
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many embedded systems.
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To use the printf you need to supply your own character output function,
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something like :
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void putc ( void* p, char c)
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{
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while (!SERIAL_PORT_EMPTY) ;
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SERIAL_PORT_TX_REGISTER = c;
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}
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Before you can call printf you need to initialize it to use your
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character output function with something like:
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init_printf(NULL,putc);
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Notice the 'NULL' in 'init_printf' and the parameter 'void* p' in 'putc',
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the NULL (or any pointer) you pass into the 'init_printf' will eventually be
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passed to your 'putc' routine. This allows you to pass some storage space (or
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anything really) to the character output function, if necessary.
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This is not often needed but it was implemented like that because it made
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implementing the sprintf function so neat (look at the source code).
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The code is re-entrant, except for the 'init_printf' function, so it
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is safe to call it from interupts too, although this may result in mixed output.
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If you rely on re-entrancy, take care that your 'putc' function is re-entrant!
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The printf and sprintf functions are actually macros that translate to
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'tfp_printf' and 'tfp_sprintf'. This makes it possible
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to use them along with 'stdio.h' printf's in a single source file.
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You just need to undef the names before you include the 'stdio.h'.
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Note that these are not function like macros, so if you have variables
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or struct members with these names, things will explode in your face.
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Without variadic macros this is the best we can do to wrap these
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fucnction. If it is a problem just give up the macros and use the
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functions directly or rename them.
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For further details see source code.
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regs Kusti, 23.10.2004
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*/
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#ifndef __TFP_PRINTF__
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#define __TFP_PRINTF__
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#include <stdarg.h>
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void init_printf(void* putp,void (*putf) (void*,char));
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void tfp_printf(char *fmt, ...);
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void tfp_sprintf(char* s,char *fmt, ...);
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void tfp_format(void* putp,void (*putf) (void*,char),char *fmt, va_list va);
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void test (char c);
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#define printf tfp_printf
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#define sprintf tfp_sprintf
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#endif

‎exercises/lesson02/2/szediwy/include/entry.h‎

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#ifndef _ENTRY_H
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#define _ENTRY_H
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#define S_FRAME_SIZE 256 // size of all saved registers
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#define SYNC_INVALID_EL1t 0
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#define IRQ_INVALID_EL1t 1
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#define FIQ_INVALID_EL1t 2
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#define ERROR_INVALID_EL1t 3
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#define SYNC_INVALID_EL1h 4
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#define IRQ_INVALID_EL1h 5
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#define FIQ_INVALID_EL1h 6
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#define ERROR_INVALID_EL1h 7
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#define SYNC_INVALID_EL0_64 8
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#define IRQ_INVALID_EL0_64 9
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#define FIQ_INVALID_EL0_64 10
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#define ERROR_INVALID_EL0_64 11
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#define SYNC_INVALID_EL0_32 12
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#define IRQ_INVALID_EL0_32 13
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#define FIQ_INVALID_EL0_32 14
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#define ERROR_INVALID_EL0_32 15
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#endif

‎exercises/lesson02/2/szediwy/include/irq.h‎

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#ifndef _IRQ_H
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#define _IRQ_H
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void enable_interrupt_controller( void );
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void irq_vector_init( void );
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void enable_irq( void );
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void disable_irq( void );
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#endif /*_IRQ_H */

‎exercises/lesson02/2/szediwy/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(void);
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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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void putc(void *p, char c);
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#endif /*_MINI_UART_H */

‎exercises/lesson02/2/szediwy/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/lesson02/2/szediwy/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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// So a peripheral described in this document as being at legacy address 0x7Enn_nnnn is available in the 35-bit address
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// space at 0x4_7Enn_nnnn, and visible to the ARM at 0x0_FEnn_nnnn if Low Peripheral mode is enabled.
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// 0x7E000000 (legacy) -> 0x4_7E00_0000 (35-bit) -> 0x0_FE00_0000 (low peripheral)
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#define PBASE 0xFE000000
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// The base address of the GIC-400 is 0x4c0040000. Note that, unlike other peripheral addresses in this document, this is an
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// ARM-only address and not a legacy master address. If Low Peripheral mode is enabled this base address becomes
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// 0xff840000.
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// The GIC-400 is configured with "NUM_CPUS=4" and "NUM_SPIS=192". For full register details, please refer to the ARM
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// GIC-400 documentation on the ARM Developer website.
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#define GIC_BASE 0xFF840000
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// The ARMC register base address is 0x7e00b000 -> 0x4_7E00B000 -> 0x0FE00B000
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#define ARMC_BASE 0x0FE00B000
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#endif /*_P_BASE_H */

‎exercises/lesson02/2/szediwy/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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#define GPIO_PUP_PDN_CNTRL_REG0 (PBASE+0x002000E4)
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#define UART0_DR (PBASE+0x00201000)
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#define UART0_FR (PBASE+0x00201018)
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#define UART0_IBRD (PBASE+0x00201024)
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#define UART0_FBRD (PBASE+0x00201028)
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#define UART0_LCRH (PBASE+0x0020102C)
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#define UART0_CR (PBASE+0x00201030)
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#define UART0_IMSC (PBASE+0x00201038)
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#endif /*_P_GPIO_H */

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