diff options
| author | Marvin Borner | 2021-07-06 22:07:04 +0200 |
|---|---|---|
| committer | Marvin Borner | 2021-07-06 22:07:04 +0200 |
| commit | b2880945ae17ad857bd425540acd3dc75b2cff6b (patch) | |
| tree | f5dea0028fb5e2b9072aa15f60c497bc7e20d13b /example/mb1 | |
| parent | 23aa6f84539ba320a91235fb81681d0754178f62 (diff) | |
Basic multiboot 1 detection and verification
Diffstat (limited to 'example/mb1')
| -rw-r--r-- | example/mb1/entry.asm | 48 | ||||
| -rw-r--r-- | example/mb1/link.ld | 33 | ||||
| -rw-r--r-- | example/mb1/main.c | 16 | ||||
| -rw-r--r-- | example/mb1/makefile | 16 |
4 files changed, 113 insertions, 0 deletions
diff --git a/example/mb1/entry.asm b/example/mb1/entry.asm new file mode 100644 index 0000000..8b8f47e --- /dev/null +++ b/example/mb1/entry.asm @@ -0,0 +1,48 @@ +; MIT License, Copyright (c) 2021 Marvin Borner + +bits 32 + +%define MULTIBOOT_MAGIC 0x1badb002 +%define MULTIBOOT_PAGE_ALIGN 0x1 +%define MULTIBOOT_MEMORY_INFO 0x2 +%define MULTIBOOT_VIDEO_MODE 0x4 +%define MULTIBOOT_FLAGS (MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO | MULTIBOOT_VIDEO_MODE) +%define MULTIBOOT_CHECKSUM -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS) + +section .text +align 4 + +dd MULTIBOOT_MAGIC +dd MULTIBOOT_FLAGS +dd MULTIBOOT_CHECKSUM + +; MULTIBOOT_MEMORY_INFO +dd 0x00000000 +dd 0x00000000 +dd 0x00000000 +dd 0x00000000 +dd 0x00000000 + +; MULTIBOOT_VIDEO_MODE +dd 0x00000000 +dd 1920 +dd 1200 +dd 32 + +global boot_entry +extern kernel_main +boot_entry: + mov esp, stack_top + push esp + push ebx + push eax + cli + call kernel_main + hlt + jmp $ + +section .bss +align 32 +stack_bottom: + resb 0x4000 +stack_top: diff --git a/example/mb1/link.ld b/example/mb1/link.ld new file mode 100644 index 0000000..0d79ef4 --- /dev/null +++ b/example/mb1/link.ld @@ -0,0 +1,33 @@ +/* MIT License, Copyright (c) 2021 Marvin Borner */ + +OUTPUT_ARCH(i386) +ENTRY(boot_entry) +phys = 0x00100000; + +SECTIONS +{ + . = phys; + + .text BLOCK(4K) : ALIGN(4K) + { + *(.text*) + } + + .rodata BLOCK(4K) : ALIGN(4K) + { + *(.rodata*) + } + + .data BLOCK(4K) : ALIGN(4K) + { + *(.data*) + } + + .bss BLOCK(4K) : ALIGN(4K) + { + *(COMMON) + *(.bss) + } + + end = .; +} diff --git a/example/mb1/main.c b/example/mb1/main.c new file mode 100644 index 0000000..0174803 --- /dev/null +++ b/example/mb1/main.c @@ -0,0 +1,16 @@ +// MIT License, Copyright (c) 2021 Marvin Borner + +typedef unsigned int u32; + +int kernel_main(u32 magic, u32 addr, u32 esp); // Decl +int kernel_main(u32 magic, u32 addr, u32 esp) +{ + (void)magic; + (void)addr; + (void)esp; + + while (1) + ; + + return 1; +} diff --git a/example/mb1/makefile b/example/mb1/makefile new file mode 100644 index 0000000..1a4e79b --- /dev/null +++ b/example/mb1/makefile @@ -0,0 +1,16 @@ +# MIT License, Copyright (c) 2021 Marvin Borner +# Gets called by main makefile (their variables are exported) + +OBJS = entry_asm.o main.o + +all: compile + +%.o: %.c + @$(CC) -c $(CFLAGS) $< -o $@ + +%_asm.o: %.asm + @$(AS) $(ASFLAGS) $< -o $@ + +compile: $(OBJS) + @mkdir -p $(BLD)/examples/ + @$(LD) -N -z max-page-size=0x1000 -eboot_entry -Tlink.ld -o $(BLD)/examples/mb1.elf $+ |