multi_boot.h

来自「Murphy 大俠 GPL 的 C++/x86 RTOS, 支持 MMU, 用戶」· C头文件 代码 · 共 202 行

/* 
 * Copyright (c) 1995-1994 The University of Utah and
 * the Computer Systems Laboratory at the University of Utah (CSL).
 * All rights reserved.
 *
 * Permission to use, copy, modify and distribute this software is hereby
 * granted provided that (1) source code retains these copyright, permission,
 * and disclaimer notices, and (2) redistributions including binaries
 * reproduce the notices in supporting documentation, and (3) all advertising
 * materials mentioning features or use of this software display the following
 * acknowledgement: ``This product includes software developed by the
 * Computer Systems Laboratory at the University of Utah.''
 *
 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * CSL requests users of this software to return to [e-mail] any
 * improvements that they make and grant CSL redistribution rights.
 */
 
#ifndef __EKERNEL_MULTI_BOOT_H_
#define __EKERNEL_MULTI_BOOT_H_

#include "Types.h"

/* For a.out kernel boot images, the following header must appear
   somewhere in the first 8192 BYTEs of the kernel image file.  */
struct multiboot_header
{
	/* Must be MULTIBOOT_MAGIC */
	unsigned		magic;

	/* Feature flags - see below.  */
	unsigned		flags;

	/* Checksum: magic + flags + checksum == 0 */
	unsigned		checksum;

	/* These are only valid if MULTIBOOT_AOUT_KLUDGE is set.  */
	vm_offset_t		header_addr;
	vm_offset_t		load_addr;
	vm_offset_t		load_end_addr;
	vm_offset_t		bss_end_addr;
	vm_offset_t		entry;
};

/* The entire multiboot_header must be contained
   within the first MULTIBOOT_SEARCH BYTEs of the kernel image.  */
#define MULTIBOOT_SEARCH	8192

/* Magic value identifying the multiboot_header.  */
#define MULTIBOOT_MAGIC		0x1badb002

/* Features flags for 'flags'.
   If a boot loader sees a flag in MULTIBOOT_MUSTKNOW set
   and it doesn't understand it, it must fail.  */
#define MULTIBOOT_MUSTKNOW	0x0000ffff

/* Align all boot modules on page (4KB) boundaries.  */
#define MULTIBOOT_PAGE_ALIGN	0x00000001

/* Must be provided memory information in multiboot_info structure */
#define MULTIBOOT_MEMORY_INFO	0x00000002

/* Use the load address fields above instead of the ones in the a.out header
   to figure out what to load where, and what to do afterwards.
   This should only be needed for a.out kernel images
   (ELF and other formats can generally provide the needed information).  */
#define MULTIBOOT_AOUT_KLUDGE	0x00010000

/* The boot loader passes this value in register EAX to signal the kernel
   that the multiboot method is being used */
#define MULTIBOOT_VALID         0x2badb002

/* The boot loader passes this data structure to the kernel in
   register EBX on entry.  */
struct multiboot_info
{
	/* These flags indicate which parts of the multiboot_info are valid;
	   see below for the actual flag bit definitions.  */
	unsigned		flags;

	/* Lower/Upper memory installed in the machine.
	   Valid only if MULTIBOOT_MEMORY is set in flags WORD above.  */
	vm_size_t		mem_lower;
	vm_size_t		mem_upper;

	/* BIOS disk device the kernel was loaded from.
	   Valid only if MULTIBOOT_BOOT_DEVICE is set in flags WORD above.  */
	unsigned char		boot_device[4];

	/* Command-line for the OS kernel: a null-terminated ASCII string.
	   Valid only if MULTIBOOT_CMDLINE is set in flags WORD above.  */
	vm_offset_t		cmdline;

	/* List of boot modules loaded with the kernel.
	   Valid only if MULTIBOOT_MODS is set in flags WORD above.  */
	unsigned		mods_count;
	vm_offset_t		mods_addr;

	/* Symbol information for a.out or ELF executables. */
	union
	{
	  struct
	  {
	    /* a.out symbol information valid only if MULTIBOOT_AOUT_SYMS
	       is set in flags WORD above.  */
	    vm_size_t		tabsize;
	    vm_size_t		strsize;
	    vm_offset_t		addr;
	    unsigned		reserved;
	  } a;

	  struct
	  {
	    /* ELF section header information valid only if
	       MULTIBOOT_ELF_SHDR is set in flags WORD above.  */
	    unsigned		num;
	    vm_size_t		size;
	    vm_offset_t		addr;
	    unsigned		shndx;
	  } e;
	} syms;

	/* Memory map buffer.
	   Valid only if MULTIBOOT_MEM_MAP is set in flags WORD above.  */
	vm_size_t		mmap_count;
	vm_offset_t		mmap_addr;
};

#define MULTIBOOT_MEMORY	(1L<<0)
#define MULTIBOOT_BOOT_DEVICE	(1L<<1)
#define MULTIBOOT_CMDLINE	(1L<<2)
#define MULTIBOOT_MODS		(1L<<3)
#define MULTIBOOT_AOUT_SYMS	(1L<<4)
#define MULTIBOOT_ELF_SHDR	(1L<<5)
#define MULTIBOOT_MEM_MAP	(1L<<6)

/* For use with printf's %b format. */
#define MULTIBOOT_FLAGS_FORMAT \
  "\20\1MEMORY\2BOOT_DEVICE\3CMDLINE\4MODS\5AOUT_SYMS\6ELF_SHDR\7MEM_MAP"

/* The mods_addr field above contains the physical address of the first
   of 'mods_count' multiboot_module structures.  */
struct multiboot_module
{
	/* Physical start and end addresses of the module data itself.  */
	vm_offset_t		mod_start;
	vm_offset_t		mod_end;

	/* Arbitrary ASCII string associated with the module.  */
	vm_offset_t		string;

	/* Boot loader must set to 0; OS must ignore.  */
	unsigned		reserved;
};


/* The mmap_addr field above contains the physical address of the first
   of the AddrRangeDesc structure.  "size" represents the size of the
   rest of the structure and optional padding.  The offset to the beginning
   of the next structure is therefore "size + 4".  */
struct AddrRangeDesc
{
  unsigned long size;
  unsigned long BaseAddrLow;
  unsigned long BaseAddrHigh;
  unsigned long LengthLow;
  unsigned long LengthHigh;
  unsigned long Type;

  /* unspecified optional padding... */
};

// usable memory "Type", all others are reserved.
#define MB_ARD_MEMORY       1


// ------------------------------------------------------------------------ //

// <1MB memory is most precious, then <16MB memory, then high memory.
// Assign priorities to each region accordingly
// so that high memory will be used first when possible,
// then 16MB memory, then 1MB memory.
#define LMM_PRI_1MB	-2
#define LMM_PRI_16MB	-1
#define LMM_PRI_HIGH	0

// For memory <1MB, both LMMF_1MB and LMMF_16MB will be set.
// For memory from 1MB to 16MB, only LMMF_16MB will be set.
// For all memory higher than that, neither will be set.
#define LMMF_1MB	0x01
#define LMMF_16MB	0x02

extern vm_offset_t phys_mem_max;

void multiboot_info_dump();
struct multiboot_module *multiboot_find(const char *string);

#endif /* _EKERNEL_MULTI_BOOT_H_ */