中国DOS联盟

-- 联合DOS 推动DOS 发展DOS --

联盟域名：www.cn-dos.net 论坛域名：www.cn-dos.net/forum
DOS，代表着自由开放与发展，我们努力起来，学习FreeDOS和Linux的自由开放与GNU精神，共同创造和发展美好的自由与GNU GPL世界吧！

游客: 注册 | 登录 | 命令行 | 会员 | 搜索 | 上传 | 帮助 »

中国DOS联盟论坛 » DOS开发编程 & 发展交流（开发室） » 有人能给一个关于内存探测（int15h,e820）的源码吗？

clker
新手上路

积分 8
发帖 3
注册 2008-1-15
状态离线

『楼主』: 有人能给一个关于内存探测（int15h,e820）的源码吗？

rt

2008-1-21 17:56

clker
新手上路

积分 8
发帖 3
注册 2008-1-15
状态离线

『第 2 楼』:

在dos下好像没有这样的程序哦。mem.exe好像不能显示3G以上内存。grub下的displaymem可以的。

2008-1-21 17:57

AlexZhang
系统支持

积分 952
发帖 410
注册 2007-2-8
状态离线

『第 3 楼』:

grub是开源的
自己去sf之类的地方找吧

2008-1-21 20:05

CrispH
初级用户

积分 108
发帖 49
注册 2007-3-9
状态离线

『第 4 楼』:

E820 的源代码? 什么意思啊? 不明白?
你是要查看系统的 E820 表吗?

2008-2-18 18:26

zyl910
中级用户

积分 282
发帖 126
注册 2006-5-17
状态离线

『第 5 楼』:

INT 15 - newer BIOSes - GET SYSTEM MEMORY MAP
AX = E820h
EAX = 0000E820h
EDX = 534D4150h ('SMAP')
EBX = continuation value or 00000000h to start at beginning of map
ECX = size of buffer for result, in bytes (should be >= 20 bytes)
ES:DI -> buffer for result (see #00581)
Return: CF clear if successful
      EAX = 534D4150h ('SMAP')
      ES:DI buffer filled
      EBX = next offset from which to copy or 00000000h if all done
      ECX = actual length returned in bytes
CF set on error
      AH = error code (86h) (see #00496 at INT 15/AH=80h)
Notes: originally introduced with the Phoenix BIOS v4.0, this function is
   now supported by most newer BIOSes, since various versions of Windows
   call it to find out about the system memory
a maximum of 20 bytes will be transferred at one time, even if ECX is
   higher; some BIOSes (e.g. Award Modular BIOS v4.50PG) ignore the
   value of ECX on entry, and always copy 20 bytes
some BIOSes expect the high word of EAX to be clear on entry, i.e.
   EAX=0000E820h
if this function is not supported, an application should fall back
   to AX=E802h, AX=E801h, and then AH=88h
the BIOS is permitted to return a nonzero continuation value in EBX
   and indicate that the end of the list has already been reached by
   returning with CF set on the next iteration
this function will return base memory and ISA/PCI memory contiguous
   with base memory as normal memory ranges; it will indicate
   chipset-defined address holes which are not in use and motherboard
   memory-mapped devices, and all occurrences of the system BIOS as
   reserved; standard PC address ranges will not be reported
SeeAlso: AH=C7h,AX=E801h"Phoenix",AX=E881h,MEM xxxxh:xxx0h"ACPI"

Format of Phoenix BIOS system memory map address range descriptor:
Offset Size Description (Table 00580)
00h QWORD base address
08h QWORD length in bytes
10h DWORD type of address range (see #00581)

(Table 00581)
Values for System Memory Map address type:
01h memory, available to OS
02h reserved, not available (e.g. system ROM, memory-mapped device)
03h ACPI Reclaim Memory (usable by OS after reading ACPI tables)
04h ACPI NVS Memory (OS is required to save this memory between NVS
   sessions)
other not defined yet -- treat as Reserved
SeeAlso: #00580

人类存在的目的就是试图理解人类为何存在

2008-2-19 12:34

请注意：您目前尚未注册或登录，请您注册或登录以使用论坛的各项功能，例如发表和回复帖子等。

可打印版本 | 推荐给朋友 | 订阅主题 | 收藏主题

论坛跳转: