From: Amelia Coutard Date: Wed, 27 Apr 2022 20:33:52 +0000 (+0200) Subject: Initial Commit X-Git-Url: https://git.ameliathe1st.gay/?a=commitdiff_plain;h=7f14be670f2c173312980875740c375fc127e2d7;p=voyage-au-centre-des-fichiers.git Initial Commit --- 7f14be670f2c173312980875740c375fc127e2d7 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..8b347f2 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +out +deps +isodir diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..9f8fd5c --- /dev/null +++ b/COPYING @@ -0,0 +1,619 @@ +GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. +Everyone is permitted to copy and distribute verbatim copies +of this license document, but changing it is not allowed. + + Preamble + +The GNU General Public License is a free, copyleft license for +software and other kinds of works. + +The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Limitation of Liability. + +IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + +17. Interpretation of Sections 15 and 16. + +If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..9daceca --- /dev/null +++ b/Makefile @@ -0,0 +1,44 @@ +.PHONY: build clean qemu + +OUT_DIR ?= out/ +SRC_DIR ?= src/ +DEPS_DIR ?= deps/ + +CXX := x86_64-elf-g++ +CXXFLAGS ?= -O2 +CXXFLAGS := $(CXXFLAGS) -Wall -Wextra -Werror \ + -ffreestanding -mcmodel=large -mno-red-zone -mno-mmx -mno-sse -mno-sse2 -fno-exceptions -fno-rtti + +LDFLAGS ?= -O2 +LDFLAGS := $(LDFLAGS) -Wall -Wextra -Werror \ + -ffreestanding -T linker.ld -z max-page-size=0x1000 +LDLIBS := $(LDLIBS) -nostdlib -lgcc + +CPPOBJS := $(patsubst $(SRC_DIR)%,$(OUT_DIR)%.o,$(shell find $(SRC_DIR) -name '*.cpp')) +ASMOBJS := $(patsubst $(SRC_DIR)%,$(OUT_DIR)%.o,$(shell find $(SRC_DIR) -name '*.S')) +OBJECTS := $(CPPOBJS) $(ASMOBJS) + +build: $(OUT_DIR)amycros.iso +qemu: build + qemu-system-x86_64 -cdrom $(OUT_DIR)amycros.iso -monitor stdio $(QEMUFLAGS) + +$(OUT_DIR)amycros.iso: $(OUT_DIR)kernel.elf64 grub.cfg + mkdir -p isodir/boot/grub + cp $(OUT_DIR)kernel.elf64 isodir/boot + cp grub.cfg isodir/boot/grub + grub-mkrescue -o "$@" isodir + +clean: + -rm -rf $(OUT_DIR) $(DEPS_DIR) isodir + + +$(OUT_DIR)kernel.elf64: $(OBJECTS) linker.ld + mkdir -p $(OUT_DIR) + $(CXX) $(LDFLAGS) -o "$@" $(OBJECTS) $(LDLIBS) + +$(OUT_DIR)%.o: $(SRC_DIR)% + mkdir -p $(@D) + mkdir -p $(dir $(DEPS_DIR)$*) + $(CXX) $(CXXFLAGS) -c "$<" -MMD -MT "$@" -MF "$(DEPS_DIR)$*.d" -o "$@" + +-include deps/*.d diff --git a/grub.cfg b/grub.cfg new file mode 100644 index 0000000..8eccea2 --- /dev/null +++ b/grub.cfg @@ -0,0 +1,3 @@ +menuentry "Amycros" { + multiboot2 /boot/kernel.elf64 +} diff --git a/linker.ld b/linker.ld new file mode 100644 index 0000000..8b2f5d4 --- /dev/null +++ b/linker.ld @@ -0,0 +1,35 @@ +ENTRY(_start) + +KERNEL_VMA = 0; /*0xffffffff80000000;*/ +SECTIONS { + + .bootstrap ALIGN(4K) : { + *(.multiboot_header) + . = ALIGN(4K); + *(.bootstrap_text) + } + + . += KERNEL_VMA; + + .text ALIGN(4K) : AT(ADDR(.text) - KERNEL_VMA) { + *(.text) + } + .rodata ALIGN(4K) : AT(ADDR(.rodata) - KERNEL_VMA) { + *(.rodata*) + } + .data ALIGN(4K) : AT(ADDR(.data) - KERNEL_VMA) { + *(.data) + } + .eh_frame ALIGN(4K) : AT(ADDR(.eh_frame) - KERNEL_VMA) { + *(.eh_frame) + } + .bss ALIGN(4K) : AT(ADDR(.bss) - KERNEL_VMA) { + *(.bss) + *(COMMON) + } + + + /DISCARD/ : { + *(.comment) + } +} diff --git a/src/boot.S b/src/boot.S new file mode 100644 index 0000000..455f86a --- /dev/null +++ b/src/boot.S @@ -0,0 +1,186 @@ +#include "multiboot2.hpp" + +.set KERNEL_VMA, 0# 0xFFFFFFFF80000000 + +.section .multiboot_header +multiboot_header_start: + .align 8 + .int multiboot2_magic + .int multiboot2_arch_i386_32bit + .int multiboot_header_end - multiboot_header_start + .int multiboot2_checksum(multiboot2_arch_i386_32bit, multiboot_header_end - multiboot_header_start) + /* End tag: */ + .align 8 + .short 0 + .short 0 + .int 8 +multiboot_header_end: + +.section .data +.set PRESENT, 1 << 7 +.set NOT_SYS, 1 << 4 +.set EXEC, 1 << 3 +.set DC, 1 << 2 +.set RW, 1 << 1 +.set ACCESSED, 1 << 0 + +.set GRAN_4K, 1 << 7 +.set SZ_32, 1 << 6 +.set LONG_MODE, 1 << 5 + +GDT: + .set GDT.NULL, . - GDT + .quad 0 + .set GDT.CODE, . - GDT + .int 0xFFFF # Limit & Base (low, bits 0-15) + .byte 0 # Base (mid, bits 16-23) + .byte PRESENT | NOT_SYS | EXEC | RW # Access + .byte GRAN_4K | LONG_MODE | 0xF # Flags & Limit (high, bits 16-19) + .byte 0 # Base (high, bits 24-31) + .set GDT.DATA, . - GDT + .int 0xFFFF # Limit & Base (low, bits 0-15) + .byte 0 # Base (mid, bits 16-23) + .byte PRESENT | NOT_SYS | RW # Access + .byte GRAN_4K | SZ_32 | 0xF # Flags & Limit (high, bits 16-19) + .byte 0 # Base (high, bits 24-31) + .set GDT.TSS, . - GDT + .int 0x00000068 + .int 0x00CF8900 + GDT.PTR: + .short . - GDT - 1 + .quad GDT + +.section .bss +.align 0x1000 +PML4T: .skip 0x1000 +PDPT: .skip 0x1000 +PDT: .skip 0x1000 +PT: .skip 0x1000 +.align 16 +stack_bottom: +.skip 1024 * 16 # 16KiB +stack_top: + +.section .bootstrap_text +.code32 +.globl _start +_start: + mov $stack_top, %esp + + # Check if cpuid is supported: + pushfl + pop %eax + mov %eax, %ecx + xor $1 << 21, %eax + push %eax + popfl + pushfl + pop %eax + push %ecx + popfl + xor %ecx, %eax + jnz .has_cpuid + movw $0x024E, 0xB8000 + movw $0x026F, 0xB8002 + movw $0x0220, 0xB8004 + movw $0x0243, 0xB8006 + movw $0x0250, 0xB8008 + movw $0x0255, 0xB800A + movw $0x0249, 0xB800C + movw $0x0244, 0xB800E + movw $0x022E, 0xB8010 + cli + 1: hlt + jmp 1b + .has_cpuid: + + # Check is long mode is supported: + mov $0x80000000, %eax + cpuid + cmp $0x80000001, %eax + jb .no_long_mode + mov $0x80000001, %eax + cpuid + test $1 << 29, %edx + jnz .has_long_mode + .no_long_mode: + movw $0x024E, 0xB8000 + movw $0x026F, 0xB8002 + movw $0x0220, 0xB8004 + movw $0x026C, 0xB8006 + movw $0x026F, 0xB8008 + movw $0x026E, 0xB800A + movw $0x0267, 0xB800C + movw $0x0220, 0xB800E + movw $0x026D, 0xB8010 + movw $0x026F, 0xB8012 + movw $0x0264, 0xB8014 + movw $0x0265, 0xB8016 + movw $0x022E, 0xB8018 + cli + 1: hlt + jmp 1b + .has_long_mode: + + # Disable 32-bit paging: + mov %cr0, %eax + and $~(1 << 31), %eax + mov %eax, %cr0 + + # Setup 64-bit paging: + mov $PML4T, %eax + mov %eax, %cr3 + mov $PDPT + 3, %eax + mov %eax, PML4T + 0 * 8 + mov $PDT + 3, %eax + mov %eax, PDPT + 0 * 8 + mov $PT + 3, %eax + mov %eax, PDT + 0 * 8 + + mov $PT, %edi + mov $0x0003, %ebx + mov $512, %ecx +1: mov %ebx, (%edi) + add $0x1000, %ebx + add $8, %edi + loop 1b + + # Enable PAE paging: + mov %cr4, %eax + or $1 << 5, %eax + mov %eax, %cr4 + + # Set long mode bit: + mov $0xC0000080, %ecx + rdmsr + or $1 << 8, %eax + wrmsr + # Enable paging: + mov %cr0, %eax + or $1 << 31, %eax + mov %eax, %cr0 + + # Jump to 64 bits: + lgdt (GDT.PTR) + jmp $GDT.CODE, $.trampoline + +.code64 +.trampoline: + mov %esp, %esp + mov $GDT.DATA, %ax # Set the A-register to the data descriptor. + mov %ax, %ds # Set the data segment to the A-register. + mov %ax, %es # Set the extra segment to the A-register. + mov %ax, %fs # Set the F-segment to the A-register. + mov %ax, %gs # Set the G-segment to the A-register. + mov %ax, %ss # Set the stack segment to the A-register. + mov $.higher_half, %rax + jmp *%rax + +.higher_half: + movw $0x024F, 0xB8000 + movw $0x026B, 0xB8002 + movw $0x022E, 0xB8004 + call kmain + cli +1: hlt + jmp 1b diff --git a/src/kernel.cpp b/src/kernel.cpp new file mode 100644 index 0000000..d3132d7 --- /dev/null +++ b/src/kernel.cpp @@ -0,0 +1,11 @@ +#include "multiboot2.hpp" + +extern "C" void kmain() { + // volatile short* vga_text = reinterpret_cast((void*)0xFFFFFFFF800B8000); + volatile short* vga_text = reinterpret_cast((void*)0xB8000); + const char* str = "Success ! Took me long enough."; + for (unsigned long i = 0; str[i] != '\0'; i++) { + vga_text[i] = (0x02 << 8) + str[i]; + } + while (true) {} +} diff --git a/src/multiboot2.hpp b/src/multiboot2.hpp new file mode 100644 index 0000000..46d2040 --- /dev/null +++ b/src/multiboot2.hpp @@ -0,0 +1,28 @@ +#ifdef __cplusplus +namespace multiboot2 { +#endif + +#ifdef __cplusplus + constexpr unsigned int magic = 0xE85250D6; +#else +# define multiboot2_magic 0xE85250D6 +#endif + +#ifdef __cplusplus + constexpr unsigned int arch_i386_32bit = 0; + constexpr unsigned int arch_mips_32bit = 4; +#else +# define multiboot2_arch_i386_32bit 0 +# define multiboot2_arch_mips_32bit 4 +#endif + +#ifdef __cplusplus + constexpr unsigned int checksum(unsigned int arch, unsigned int length) { return -(magic + arch + length); } +#else +# define multiboot2_checksum(arch, length) -(multiboot2_magic + (arch) + (length)) +#endif + + +#ifdef __cplusplus +} +#endif