[LinksOS CVS Commit]linksos/boot/x86 io.c,NONE,1.1 io.h,NONE,1.1 multiboot.S,NONE,1.1 multiboot.h,NONE,1.1

[<ke...@to...>]

Update of /cvsroot/linksos/linksos/boot/x86
In directory router-internal.tossell.net:/tmp/cvs-serv21516/boot/x86

Added Files:
	io.c io.h multiboot.S multiboot.h 
Log Message:
Title: Multiboot and IO files 
Changes: Added the source code for multiboot and some i/o, which really should be in hal/

Effects: Multiboot works.

a=kennyt


--- NEW FILE: io.c ---
#include "io.h"

inline unsigned char inportb(unsigned int port)         /* Input a byte from a port     */
{
  unsigned char ret;

  asm volatile ("inb %%dx,%%al":"=a" (ret):"d" (port));
  return ret;
}

inline void outportb(unsigned int port,unsigned char value)     /* Output a byte to a port      */
{
  asm volatile ("outb %%al,%%dx"::"d" (port), "a" (value));
}


--- NEW FILE: io.h ---
#ifndef _IO_H
#define _IO_H

inline unsigned char inportb(unsigned int port);
inline void outportb(unsigned int port, unsigned char value);


#endif

--- NEW FILE: multiboot.S ---
#define ASM     1
#include "multiboot.h"

	        .text

	        .globl  start, _start
start:
_start:
	        jmp     multiboot_entry

	        /* Align 32 bits boundary.  */
	        .align  4

	        /* Multiboot header.  */
multiboot_header:
	        /* magic */
	        .long   MULTIBOOT_HEADER_MAGIC
	        /* flags */
	        .long   MULTIBOOT_HEADER_FLAGS
	        /* checksum */
	        .long   -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
	#ifndef __ELF__
	        /* header_addr */
	        .long   multiboot_header
	        /* load_addr */
	        .long   _start
	        /* load_end_addr */
	        .long   _edata
	        /* bss_end_addr */
	        .long   _end
	        /* entry_addr */
	        .long   multiboot_entry
	#endif /* ! __ELF__ */

multiboot_entry:
	        /* Initialize the stack pointer.  */
	        movl    $(stack + STACK_SIZE), %esp

	        /* Reset EFLAGS.  */
	        pushl   $0
	        popf

	        /* Push the pointer to the Multiboot information structure.  */
	        pushl   %ebx
	        /* Push the magic value.  */
	        pushl   %eax

	        /* Now enter the C main function...  */
	        call    EXT_C(cmain)

	        /* Halt.  */
	        pushl   $halt_message
	        call    EXT_C(kprintf)

loop:	   hlt
	        jmp     loop

halt_message:
	        .asciz  "Halted."

	        /* Our stack area.  */
	        .comm   stack, STACK_SIZE

--- NEW FILE: multiboot.h ---
/* The magic number for the Multiboot header.  */
#define MULTIBOOT_HEADER_MAGIC          0x1BADB002

/* The flags for the Multiboot header.  */
#ifdef __ELF__
# define MULTIBOOT_HEADER_FLAGS         0x00000003
#else
# define MULTIBOOT_HEADER_FLAGS         0x00010003
#endif

/* The magic number passed by a Multiboot-compliant boot loader.  */
#define MULTIBOOT_BOOTLOADER_MAGIC      0x2BADB002

/* The size of our stack (16KB).  */
#define STACK_SIZE                      0x4000

/* 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 boot.S.  */

/* 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;
} 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;

#endif /* ! ASM */