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Index > Main > UEFI 64-bit hello world example

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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
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vid
enjoy


Description:
Download
Filename: efi_hello.zip
Filesize: 1.36 KB
Downloaded: 464 Time(s)

Post 30 Mar 2009, 13:35
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bitRAKE



Joined: 21 Jul 2003
Posts: 2915
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bitRAKE
I know almost nothing about UEFI, but it looks like a COM (common object model - not 100h based DOS executable) interface with a fastcall (MS Win64 type) calling convention?
Post 30 Mar 2009, 15:10
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
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Location: In your JS exploiting you and your system
revolution
bitRAKE wrote:
I know almost nothing about UEFI, but it looks like a COM (common object model - not 100h based DOS executable) interface with a fastcall (MS Win64 type) calling convention?
google! Have you seen this: http://www.uefi.org/specs/
Post 30 Mar 2009, 15:15
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MazeGen



Joined: 06 Oct 2003
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MazeGen
bitRAKE wrote:
I know almost nothing about UEFI, but it looks like a COM (common object model - not 100h based DOS executable) interface with a fastcall (MS Win64 type) calling convention?

I'm releasing vid's article which contains answers to these questions tomorrow (hopefully).
Post 30 Mar 2009, 19:33
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
It is object-oriented programming, not COM (COM is specific subset of OOP, and COM specifics are not present in UEFI). And yes, calling convetion is usual 64-bit fastcall.

You can find basics about UEFI here: http://x86asm.net/articles/introduction-to-uefi/index.html

and rest will be (hopefully) on x86asm.net tomorrow.
Post 30 Mar 2009, 22:06
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Madis731



Joined: 25 Sep 2003
Posts: 2141
Location: Estonia
Madis731
I guess the article will explain everything, but what can you do with it?
I've followed all the discussion on it, but I just don't get it?

Firstly) Its really simple src+inc
Secondly) FASM assembles it okay
Thirdly) ??? I've got the binary, now what Very Happy

Can I show my USB-stick to my motherboard?
Can I boot from a FAT32-formatted stick w/ binary loaded on it?
Should I go to BIOS and tell him/her about my next best thing to sliced bread?
Post 31 Mar 2009, 10:49
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
Post 31 Mar 2009, 11:00
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Madis731



Joined: 25 Sep 2003
Posts: 2141
Location: Estonia
Madis731
x86asm.net wrote:
USB pen should be enough, but in practice none of 4 brands I tried worked


Sad I'll try my X58 board, when I get home...

More bad (and some good?) news:
arstechnica.com wrote:
Yes, Intel desktop motherboards have supported UEFI boot for quite a while (since at least the D975XBX motherboard, through the 965 series, 3-series and 4-series chipsets). It's crap, though. You need to switch the SATA mode in the BIOS to legacy IDE mode, and once you've done this, you'd better not have the install become unbootable in any way, or you won't be able to boot off the DVD in UEFI mode in order to recover the install (or clear the UEFI bootlist in the NVRAM for that matter, which means you'll need to hit F10 from then onward every boot to pick non-UEFI media to boot from). There's no EFI shell built into the firmware to manipulate the boot list, either, unlike Intel's server boards.


I had the D975 both XBX and XBX2, shoot I didn't test...
Now I have 3-series to test on and I even think I can find a 4-series board...

_________________
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Last edited by Madis731 on 31 Mar 2009, 11:23; edited 1 time in total
Post 31 Mar 2009, 11:12
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
Do you have board with firmware that supports UEFI?
Post 31 Mar 2009, 11:23
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Madis731



Joined: 25 Sep 2003
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Madis731
According to this:
http://episteme.arstechnica.com/eve/forums/a/tpc/f/77909774/m/835001984931
I have..

EDIT:
And according to my testings last night, everything works perfectly.
1) BIOS boot options list UEFI as [Disabled]/[Enabled]
2) Intel boots USB-sticks with autodetected filesystem and all FATs are supported
3) *.efi files are located automatically from the tree \EFI\BOOT\BOOTX64.EFI

I tried only with shell under the directory tree and loaded my HelloWorld app from fs0:\hello.efi

No comments, just works out of the box Smile

USB-stick was a 2GB Kingston DT, with FAT32 and Shell installed+hello.efi.
Motherboard was a DX58SO, CPU i7 920, RAM 6GB 1600MHz Corsairs, BIOS was the newest at the time: 25.02.2009 (ver. 3504). The major change in EFI was during ver. 3044 update (19.12.2008).
Post 31 Mar 2009, 11:26
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