2 question to linux experts

Davit · Dec 6, 2004, 13:43

Hi all,
I have two questions to Linux experts,
1. Is it possible to call some BIOS function from Linux Kernel ?
I know that BIOS code is written only for real-mode execution, anyway, do u know some trick to call them ?

Ektich · Dec 7, 2004, 10:25

I myself am not a Linux Developer, but will presume that Linux Kernel will not let you call any interrupts (BIOS functions as you call them) directly, but will provide with an API for most (if not all) of the cases. But then again, if you're writing low-level device driver you have to call BIOS interrupts (again, this is my asusmption, I'm not a Linux developer). So it all depends on what exaclty you're trying to do.

That's one question. What was the second one?

Ektich

Davit · Dec 9, 2004, 06:13

Of Course you can't call BIOS interrupts from Kernel, because the Kernel works already in Protected Mode and disables these kind of interrupts ...

I think the only way is to switch to real mode (with saving processor state), to call the BIOS function, and again swtich to PM (with restoring proc state) ...

Dec 6, 2004, 13:43	#1
Davit ppz kkz Join Date: Mar 2003 Location: at home Posts: 122 Rep Power: 6 Reputation: 29	2 question to linux experts Hi all, I have two questions to Linux experts, 1. Is it possible to call some BIOS function from Linux Kernel ? I know that BIOS code is written only for real-mode execution, anyway, do u know some trick to call them ?

Dec 7, 2004, 10:25	#2
Ektich Guru Apprentice Join Date: Feb 2002 Location: /dev/null Posts: 524 Rep Power: 7 Reputation: 10	I myself am not a Linux Developer, but will presume that Linux Kernel will not let you call any interrupts (BIOS functions as you call them) directly, but will provide with an API for most (if not all) of the cases. But then again, if you're writing low-level device driver you have to call BIOS interrupts (again, this is my asusmption, I'm not a Linux developer). So it all depends on what exaclty you're trying to do. That's one question. What was the second one? Ektich __________________ \/\/h47'5 1n 4 n4m3? 7h47 wh1(h w3 (4\|\| 4 r053, 8y 4ny 07h3r n4m3 w0u\|d 5m3\|\| 45 5w337...

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Dec 9, 2004, 06:13	#3
Davit ppz kkz Join Date: Mar 2003 Location: at home Posts: 122 Rep Power: 6 Reputation: 29	Of Course you can't call BIOS interrupts from Kernel, because the Kernel works already in Protected Mode and disables these kind of interrupts ... I think the only way is to switch to real mode (with saving processor state), to call the BIOS function, and again swtich to PM (with restoring proc state) ...