migrate: to gitea
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@@ -0,0 +1,3 @@
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*.d
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*.kernel
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*.o
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@@ -0,0 +1,83 @@
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DEFAULT_HOST!=../default-host.sh
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HOST?=DEFAULT_HOST
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HOSTARCH!=../target-triplet-to-arch.sh $(HOST)
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CFLAGS?=-O2 -g
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CPPFLAGS?=
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LDFLAGS?=
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LIBS?=
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DESTDIR?=
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PREFIX?=/usr/local
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EXEC_PREFIX?=$(PREFIX)
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BOOTDIR?=$(EXEC_PREFIX)/boot
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INCLUDEDIR?=$(PREFIX)/include
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CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
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CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
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LDFLAGS:=$(LDFLAGS)
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LIBS:=$(LIBS) -nostdlib -lk -lgcc
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ARCHDIR=arch/$(HOSTARCH)
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include $(ARCHDIR)/make.config
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CFLAGS:=$(CFLAGS) $(KERNEL_ARCH_CFLAGS)
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CPPFLAGS:=$(CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
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LDFLAGS:=$(LDFLAGS) $(KERNEL_ARCH_LDFLAGS)
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LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS)
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KERNEL_OBJS=\
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$(KERNEL_ARCH_OBJS) \
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kernel/kernel.o \
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OBJS=\
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$(ARCHDIR)/crti.o \
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$(ARCHDIR)/crtbegin.o \
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$(KERNEL_OBJS) \
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$(ARCHDIR)/crtend.o \
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$(ARCHDIR)/crtn.o \
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LINK_LIST=\
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$(LDFLAGS) \
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$(ARCHDIR)/crti.o \
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$(ARCHDIR)/crtbegin.o \
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$(KERNEL_OBJS) \
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$(LIBS) \
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$(ARCHDIR)/crtend.o \
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$(ARCHDIR)/crtn.o \
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.PHONY: all clean install install-headers install-kernel
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.SUFFIXES: .o .c .S
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all: fubar.kernel
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fubar.kernel: $(OBJS) $(ARCHDIR)/linker.ld
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$(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(LINK_LIST)
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grub-file --is-x86-multiboot fubar.kernel
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$(ARCHDIR)/crtbegin.o $(ARCHDIR)/crtend.o:
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OBJ=`$(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=$(@F)` && cp "$$OBJ" $@
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.c.o:
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$(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS)
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.S.o:
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$(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
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clean:
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rm -f fubar.kernel
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rm -f $(OBJS) *.o */*.o */*/*.o
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rm -f $(OBJS:.o=.d) *.d */*.d */*/*.d
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install: install-headers install-kernel
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install-headers:
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mkdir -p $(DESTDIR)$(INCLUDEDIR)
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cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/.
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install-kernel: fubar.kernel
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mkdir -p $(DESTDIR)$(BOOTDIR)
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cp fubar.kernel $(DESTDIR)$(BOOTDIR)
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-include $(OBJS:.o=.d)
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@@ -0,0 +1,39 @@
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# Declare constants for the multiboot header.
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.set ALIGN, 1<<0 # align loaded modules on page boundaries
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.set MEMINFO, 1<<1 # provide memory map
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.set FLAGS, ALIGN | MEMINFO # this is the Multiboot 'flag' field
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.set MAGIC, 0x1BADB002 # 'magic number' lets bootloader find the header
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.set CHECKSUM, -(MAGIC + FLAGS) # checksum of above, to prove we are multiboot
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# Declare a header as in the Multiboot Standard.
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.section .multiboot
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.align 4
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.long MAGIC
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.long FLAGS
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.long CHECKSUM
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# Reserve a stack for the initial thread.
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.section .bss
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.align 16
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stack_bottom:
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.skip 16384 # 16 KiB
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stack_top:
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# The kernel entry point.
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.section .text
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.global _start
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.type _start, @function
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_start:
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movl $stack_top, %esp
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# Call the global constructors.
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call _init
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# Transfer control to the main kernel.
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call kernel_main
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# Hang if kernel_main unexpectedly returns.
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cli
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1: hlt
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jmp 1b
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.size _start, . - _start
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@@ -0,0 +1,15 @@
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.section .init
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.global _init
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.type _init, @function
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_init:
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push %ebp
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movl %esp, %ebp
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/* gcc will nicely put the contents of crtbegin.o's .init section here. */
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.section .fini
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.global _fini
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.type _fini, @function
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_fini:
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push %ebp
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movl %esp, %ebp
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/* gcc will nicely put the contents of crtbegin.o's .fini section here. */
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@@ -0,0 +1,9 @@
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.section .init
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/* gcc will nicely put the contents of crtend.o's .init section here. */
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popl %ebp
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ret
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.section .fini
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/* gcc will nicely put the contents of crtend.o's .fini section here. */
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popl %ebp
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ret
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@@ -0,0 +1,43 @@
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/* The bootloader will look at this image and start execution at the symbol
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designated at the entry point. */
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ENTRY(_start)
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/* Tell where the various sections of the object files will be put in the final
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kernel image. */
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SECTIONS
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{
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/* Begin putting sections at 1 MiB, a conventional place for kernels to be
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loaded at by the bootloader. */
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. = 1M;
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/* First put the multiboot header, as it is required to be put very early
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early in the image or the bootloader won't recognize the file format.
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Next we'll put the .text section. */
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.text BLOCK(4K) : ALIGN(4K)
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{
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*(.multiboot)
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*(.text)
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}
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/* Read-only data. */
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.rodata BLOCK(4K) : ALIGN(4K)
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{
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*(.rodata)
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}
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/* Read-write data (initialized) */
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.data BLOCK(4K) : ALIGN(4K)
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{
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*(.data)
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}
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/* Read-write data (uninitialized) and stack */
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.bss BLOCK(4K) : ALIGN(4K)
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{
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*(COMMON)
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*(.bss)
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}
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/* The compiler may produce other sections, put them in the proper place in
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in this file, if you'd like to include them in the final kernel. */
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}
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@@ -0,0 +1,8 @@
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KERNEL_ARCH_CFLAGS=
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KERNEL_ARCH_CPPFLAGS=
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KERNEL_ARCH_LDFLAGS=
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KERNEL_ARCH_LIBS=
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KERNEL_ARCH_OBJS=\
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$(ARCHDIR)/boot.o \
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$(ARCHDIR)/tty.o \
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@@ -0,0 +1,58 @@
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <kernel/tty.h>
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#include "vga.h"
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static const size_t VGA_WIDTH = 80;
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static const size_t VGA_HEIGHT = 25;
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static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;
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static size_t terminal_row;
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static size_t terminal_column;
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static uint8_t terminal_color;
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static uint16_t* terminal_buffer;
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void terminal_initialize(void) {
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terminal_row = 0;
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terminal_column = 0;
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terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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terminal_buffer = VGA_MEMORY;
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for (size_t y = 0; y < VGA_HEIGHT; y++) {
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(' ', terminal_color);
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}
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}
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}
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void terminal_setcolor(uint8_t color) {
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terminal_color = color;
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}
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void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(c, color);
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}
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void terminal_putchar(char c) {
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unsigned char uc = c;
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terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
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if (++terminal_column == VGA_WIDTH) {
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terminal_column = 0;
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if (++terminal_row == VGA_HEIGHT)
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terminal_row = 0;
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}
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}
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void terminal_write(const char* data, size_t size) {
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for (size_t i = 0; i < size; i++)
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terminal_putchar(data[i]);
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}
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void terminal_writestring(const char* data) {
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terminal_write(data, strlen(data));
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}
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@@ -0,0 +1,33 @@
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#ifndef ARCH_I386_VGA_H
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#define ARCH_I386_VGA_H
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#include <stdint.h>
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enum vga_color {
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VGA_COLOR_BLACK = 0,
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VGA_COLOR_BLUE = 1,
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VGA_COLOR_GREEN = 2,
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VGA_COLOR_CYAN = 3,
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VGA_COLOR_RED = 4,
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VGA_COLOR_MAGENTA = 5,
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VGA_COLOR_BROWN = 6,
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VGA_COLOR_LIGHT_GREY = 7,
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VGA_COLOR_DARK_GREY = 8,
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VGA_COLOR_LIGHT_BLUE = 9,
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VGA_COLOR_LIGHT_GREEN = 10,
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VGA_COLOR_LIGHT_CYAN = 11,
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VGA_COLOR_LIGHT_RED = 12,
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VGA_COLOR_LIGHT_MAGENTA = 13,
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VGA_COLOR_LIGHT_BROWN = 14,
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VGA_COLOR_WHITE = 15,
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};
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static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) {
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return fg | bg << 4;
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}
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static inline uint16_t vga_entry(unsigned char uc, uint8_t color) {
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return (uint16_t) uc | (uint16_t) color << 8;
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}
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#endif
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@@ -0,0 +1,11 @@
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#ifndef _KERNEL_TTY_H
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#define _KERNEL_TTY_H
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#include <stddef.h>
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void terminal_initialize(void);
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void terminal_putchar(char c);
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void terminal_write(const char* data, size_t size);
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void terminal_writestring(const char* data);
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#endif
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@@ -0,0 +1,8 @@
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#include <stdio.h>
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#include <kernel/tty.h>
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void kernel_main(void) {
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terminal_initialize();
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printf("Hello, kernel World!\n");
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}
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