Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > openwatcom.users.c_cpp > #3580

Re: How do I use #pragma aux with the HLT instruction?

Show all headers | View raw

On 10/10/2019 3:42 am, nospam_2019@efbe.prima.de wrote:
>> Dear o.u.c_cpp,
>>
>> How do I write a #pragma aux for the HLT instruction?  And how do I use
>> said #pragma aux?  Are there any cotchas I need to be aware of when I
>> use the HLT instruction?
>>
>> For context, I'm writing a DOS extended program with CauseWay, and want
>> to be nice to the CPU fan in my program's idle loop for people such as
>> myself who run DOS operating systems in a virtual machine.
>>
>>
> You have seen this info about Auxiliary Pragmas in the C Guide?

Thank you for the info.  I got some help on IRC, and ended up with this 
definition.

void hlt( void );
#pragma aux hlt = "hlt" modify exact [] nomemory;

Unfortunately, it just ends with an error because it's a privileged 
instruction and I can't use it in protected mode.


-- 
Johann | email: invalid -> com | www.myrkraverk.com/blog/
I'm not from the Internet, I just work there. | twitter: @myrkraverk

Back to openwatcom.users.c_cpp | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

How do I use #pragma aux with the HLT instruction? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2019-10-10 01:31 +0800
  Re: How do I use #pragma aux with the HLT instruction? nospam_2019@efbe.prima.de - 2019-10-09 21:42 +0200
    Re: How do I use #pragma aux with the HLT instruction? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2019-10-10 23:37 +0800
      Re: How do I use #pragma aux with the HLT instruction? Paul S Person <psperson1@ix.netcom.invalid> - 2019-10-10 09:07 -0700
        Re: How do I use #pragma aux with the HLT instruction? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2019-10-11 00:18 +0800
          Re: How do I use #pragma aux with the HLT instruction? Frank Beythien <fbeythien@gmx.de> - 2019-10-10 18:43 +0200
      Re: How do I use #pragma aux with the HLT instruction? "Steven Levine" <steve53@nomail.earthlink.net> - 2019-10-12 16:55 +0000

csiph-web