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daniroddanirod
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Start a simple multiboot application
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9 files changed

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‎.clang-format

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---
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Language: Cpp
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AlignAfterOpenBracket: Align
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AlignConsecutiveMacros: false
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AlignConsecutiveAssignments: false
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AlignConsecutiveBitFields: false
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AlignConsecutiveDeclarations: false
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AlignEscapedNewlines: DontAlign
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AlignOperands: Align
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AlignTrailingComments: false
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AllowAllArgumentsOnNextLine: false
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AllowAllConstructorInitializersOnNextLine: false
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AllowAllParametersOfDeclarationOnNextLine: false
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AllowShortEnumsOnASingleLine: false
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AllowShortBlocksOnASingleLine: false
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AllowShortCaseLabelsOnASingleLine: false
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AllowShortFunctionsOnASingleLine: None
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AllowShortLambdasOnASingleLine: None
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AllowShortIfStatementsOnASingleLine: Never
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AllowShortLoopsOnASingleLine: false
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AlwaysBreakAfterDefinitionReturnType: All
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AlwaysBreakAfterReturnType: TopLevelDefinitions
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AlwaysBreakBeforeMultilineStrings: false
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AlwaysBreakTemplateDeclarations: Yes
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BinPackArguments: false
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BinPackParameters: false
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BreakBeforeBinaryOperators: NonAssignment
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BreakBeforeBraces: Linux
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BreakBeforeTernaryOperators: true
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BreakStringLiterals: true
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ColumnLimit: 80
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CommentPragmas: '^ IWYU pragma:'
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ContinuationIndentWidth: 4
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Cpp11BracedListStyle: true
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DeriveLineEnding: true
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DerivePointerAlignment: false
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DisableFormat: false
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FixNamespaceComments: true
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ForEachMacros:
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- foreach
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- Q_FOREACH
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- BOOST_FOREACH
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IncludeBlocks: Preserve
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IncludeCategories:
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- Regex: '^"(llvm|llvm-c|clang|clang-c)/'
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Priority: 2
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SortPriority: 0
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- Regex: '^(<|"(gtest|gmock|isl|json)/)'
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Priority: 3
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SortPriority: 0
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- Regex: '.*'
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Priority: 1
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SortPriority: 0
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IncludeIsMainRegex: '(Test)?$'
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IncludeIsMainSourceRegex: ''
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IndentCaseLabels: false
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IndentCaseBlocks: false
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IndentGotoLabels: true
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IndentPPDirectives: None
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IndentExternBlock: AfterExternBlock
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IndentWidth: 8
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IndentWrappedFunctionNames: false
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KeepEmptyLinesAtTheStartOfBlocks: false
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MacroBlockBegin: ''
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MacroBlockEnd: ''
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MaxEmptyLinesToKeep: 1
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NamespaceIndentation: None
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PenaltyBreakAssignment: 2
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PenaltyBreakBeforeFirstCallParameter: 19
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PenaltyBreakComment: 300
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PenaltyBreakFirstLessLess: 120
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PenaltyBreakString: 1000
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PenaltyBreakTemplateDeclaration: 10
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PenaltyExcessCharacter: 1000000
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PenaltyReturnTypeOnItsOwnLine: 60
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PointerAlignment: Right
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ReflowComments: true
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SortIncludes: true
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SortUsingDeclarations: true
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SpaceAfterCStyleCast: true
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SpaceAfterLogicalNot: false
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SpaceAfterTemplateKeyword: true
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SpaceBeforeAssignmentOperators: true
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SpaceBeforeCpp11BracedList: false
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SpaceBeforeCtorInitializerColon: true
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SpaceBeforeInheritanceColon: true
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SpaceBeforeParens: ControlStatements
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SpaceBeforeRangeBasedForLoopColon: true
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SpaceInEmptyBlock: false
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SpaceInEmptyParentheses: false
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SpacesBeforeTrailingComments: 1
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SpacesInAngles: false
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SpacesInConditionalStatement: false
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SpacesInContainerLiterals: true
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SpacesInCStyleCastParentheses: false
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SpacesInParentheses: false
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SpacesInSquareBrackets: false
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SpaceBeforeSquareBrackets: false
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Standard: Latest
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TabWidth: 8
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UseCRLF: false
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UseTab: AlignWithSpaces

‎.gitignore

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compile_commands.json
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build/*/kernel
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.cache/clangd
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*.o

‎build/i386/GNUmakefile

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.PHONY: qemu clean
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SYSROOT=../../sys
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CC=gcc
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CPPFLAGS=-I.
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CFLAGS=-m32 -ffreestanding -nostdlib -fno-builtin
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AS=nasm
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ASFLAGS=-f elf32
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LD=gcc
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LDFLAGS=-m32 -nostdlib -ffreestanding -static -T $(SYSROOT)/i386/conf/linker.ld
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# Extend the Makefile
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vpath %.h machine
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vpath %.c $(SYSROOT)/i386/i386
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vpath %.c $(SYSROOT)/kernel
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vpath %.asm $(SYSROOT)/i386/i386
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vpath %.ld $(SYSROOT)/i386/conf
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%.o: %.asm
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$(AS) $(ASFLAGS) -o $@ $<
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#####################
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kernel: linker.ld boot.o main.o console.o
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$(LD) $(LDFLAGS) -o $@ *.o
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boot.o: boot.asm
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main.o: main.c platform.h
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console.o: console.c platform.h
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qemu: kernel
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qemu-system-i386 -kernel kernel
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clean:
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rm -f kernel *.o

‎build/i386/machine

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../../sys/i386/include

‎sys/i386/conf/linker.ld

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OUTPUT_ARCH(i386);
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OUTPUT_FORMAT(elf32-i386);
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ENTRY(bootMain)
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SECTIONS
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{
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. = 0x100000;
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.boot : { *(.boot) }
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.text : ALIGN(0x1000) { *(.text) }
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.bss : ALIGN(0x1000) { *(.bss) }
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}

‎sys/i386/i386/boot.asm

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section .boot
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align 4
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multibootMagic equ 0x1BADB002
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multibootFlags equ 0
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multibootCheck equ -(multibootMagic + multibootFlags)
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multibootHeader:
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dd multibootMagic
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dd multibootFlags
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dd multibootCheck
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section .text
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extern kernelMain
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global bootMain
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bootMain:
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mov esp, stackTop
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mov ebp, esp
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call kernelMain
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bootDie:
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hlt
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jmp bootDie
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section .bss
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stackBottom:
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resb 8192
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stackTop:
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; vim:ft=nasm

‎sys/i386/i386/console.c

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#include <machine/platform.h>
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#include <stdint.h>
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#define VIDEO_BUFFER 0xb8000
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#define VIDEO_COLS 80
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#define VIDEO_LINES 25
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#define VIDEO_SIZE (VIDEO_COLS * VIDEO_LINES)
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static uint16_t *video_region = (uint16_t *) VIDEO_BUFFER;
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static uint16_t video_pos = 0;
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static void
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consolePrintChar(char ch)
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{
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// Print next character
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video_region[video_pos] = 0x0700 | ch;
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video_pos++;
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// TODO: Maybe scroll if end of screen
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}
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static void
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consoleNextLine()
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{
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video_pos = (video_pos + VIDEO_COLS) - (video_pos % VIDEO_COLS);
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}
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void
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consolePrint(const char *str)
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{
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char *ptr = (char *) str;
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while (ptr && *ptr) {
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switch (*ptr) {
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case '\n':
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consoleNextLine();
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break;
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default:
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consolePrintChar(*ptr);
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break;
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}
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ptr++;
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}
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}
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void
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consoleClear()
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{
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for (int i = 0; i < VIDEO_SIZE; i++) {
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video_region[i] = 0x0720;
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}
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video_pos = 0;
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}

‎sys/i386/i386/main.c

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#include <machine/platform.h>
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void
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kernelMain(void)
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{
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consoleClear();
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consolePrint("Hola YouTube\n");
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consolePrint("Como estamos\n");
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}

‎sys/i386/include/platform.h

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#pragma once
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void consoleClear();
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void consolePrint(const char *);

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