diff options
Diffstat (limited to 'sos-code-article6.75/bootstrap')
| -rw-r--r-- | sos-code-article6.75/bootstrap/multiboot.S | 85 | ||||
| -rw-r--r-- | sos-code-article6.75/bootstrap/multiboot.h | 133 |
2 files changed, 218 insertions, 0 deletions
diff --git a/sos-code-article6.75/bootstrap/multiboot.S b/sos-code-article6.75/bootstrap/multiboot.S new file mode 100644 index 0000000..546d947 --- /dev/null +++ b/sos-code-article6.75/bootstrap/multiboot.S @@ -0,0 +1,85 @@ +/* Copyright (C) 1999 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + USA. +*/ + + +/* The operating system is booted by Grub, so we almost have nothing + to do to boot it. We only have to conform to the Multiboot + standard, as defined by the Grub documentation */ + +#define ASM 1 +/* The multiboot.h header contains a lot of multiboot standard + definitions */ +#include "multiboot.h" + + /* The multiboot header itself. It must come first. */ +.section ".multiboot" + /* Multiboot header must be aligned on a 4-byte boundary */ + .align 4 +multiboot_header: + /* magic= */ .long MULTIBOOT_HEADER_MAGIC + /* flags= */ .long MULTIBOOT_HEADER_FLAGS + /* checksum= */ .long -(MULTIBOOT_HEADER_MAGIC \ + +MULTIBOOT_HEADER_FLAGS) + /* header_addr= */ .long multiboot_header + /* load_addr= */ .long __b_load + /* load_end_addr=*/ .long __e_load + /* bss_end_addr= */ .long __e_kernel + /* entry_addr= */ .long multiboot_entry + +/* Here is the beginning of the code of our operating system */ +.text + +.globl start, _start +start: +_start: +multiboot_entry: + /* Set up a stack */ + movl $(stack + MULTIBOOT_STACK_SIZE), %ebp + movl %ebp, %esp + + /* Set EFLAGS to 0 */ + pushl $0 + /* pop stack into the EFLAGS register */ + popf + + /* Push the magic and the address on the stack, so that they + will be the parameters of the cmain function */ + pushl %ebx + pushl %eax + + /* Call the cmain function (os.c) */ + call EXT_C(sos_main) + + /* Should never get there */ +loop: + hlt + jmp loop + +/* Here is the stack */ +.section ".init_stack", "aw", @nobits +.size stack, MULTIBOOT_STACK_SIZE +stack: + .space MULTIBOOT_STACK_SIZE + +/* Some data characterizing the stack addresses */ +.data + .globl bootstrap_stack_bottom +bootstrap_stack_bottom: .long stack + + .globl bootstrap_stack_size +bootstrap_stack_size: .long MULTIBOOT_STACK_SIZE diff --git a/sos-code-article6.75/bootstrap/multiboot.h b/sos-code-article6.75/bootstrap/multiboot.h new file mode 100644 index 0000000..ee9cdbd --- /dev/null +++ b/sos-code-article6.75/bootstrap/multiboot.h @@ -0,0 +1,133 @@ +#ifndef __MULTIBOOT_H__ +#define __MULTIBOOT_H__ + +/* multiboot.h - the header for Multiboot */ +/* Copyright (C) 1999 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Macros. */ + +/* The magic number for the Multiboot header. */ +#define MULTIBOOT_HEADER_MAGIC 0x1BADB002 + +/* The flags for the Multiboot header. */ +#define MULTIBOOT_HEADER_FLAGS 0x00010003 + +/* The magic number passed by a Multiboot-compliant boot loader. */ +#define MULTIBOOT_BOOTLOADER_MAGIC 0x2BADB002 + +/* The size of our stack (16KB). */ +#define MULTIBOOT_STACK_SIZE 0x4000 + +#define MULTIBOOT_CMDLINE 4 +#define MULTIBOOT_MODS 8 + +/* C symbol format. HAVE_ASM_USCORE is defined by configure. */ +#ifdef HAVE_ASM_USCORE +# define EXT_C(sym) _ ## sym +#else +# define EXT_C(sym) sym +#endif + +#ifndef ASM +/* Do not include here in the assembler sources. */ + +#include <sos/types.h> + +/* The address of the stack of the bootstrap thread */ +extern sos_vaddr_t bootstrap_stack_bottom; +extern sos_size_t bootstrap_stack_size; + +/* Types. */ + +/* The Multiboot header. */ +typedef struct multiboot_header +{ + unsigned long magic; + unsigned long flags; + unsigned long checksum; + unsigned long header_addr; + unsigned long load_addr; + unsigned long load_end_addr; + unsigned long bss_end_addr; + unsigned long entry_addr; +} multiboot_header_t; + +/* The symbol table for a.out. */ +typedef struct aout_symbol_table +{ + unsigned long tabsize; + unsigned long strsize; + unsigned long addr; + unsigned long reserved; +} aout_symbol_table_t; + +/* The section header table for ELF. */ +typedef struct elf_section_header_table +{ + unsigned long num; + unsigned long size; + unsigned long addr; + unsigned long shndx; +} elf_section_header_table_t; + +/* The Multiboot information. */ +typedef struct multiboot_info +{ + unsigned long flags; + unsigned long mem_lower; + unsigned long mem_upper; + unsigned long boot_device; + unsigned long cmdline; + unsigned long mods_count; + unsigned long mods_addr; + union + { + aout_symbol_table_t aout_sym; + elf_section_header_table_t elf_sec; + } u; + unsigned long mmap_length; + unsigned long mmap_addr; + unsigned long drives_length; + unsigned long drives_addr; +} multiboot_info_t; + +/* The module structure. */ +typedef struct module +{ + unsigned long mod_start; + unsigned long mod_end; + unsigned long string; + unsigned long reserved; +} module_t; + +/* The memory map. Be careful that the offset 0 is base_addr_low + but no size. */ +typedef struct memory_map +{ + unsigned long size; + unsigned long base_addr_low; + unsigned long base_addr_high; + unsigned long length_low; + unsigned long length_high; + unsigned long type; +} memory_map_t; + +void dump_multiboot_info(multiboot_info_t *mbi); + +#endif /* ! ASM */ + +#endif /* __MULTIBOOT_H__ */ |