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Index > OS Construction > Will bios call change segment registers?

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l4m2 Joined: 15 Jan 2015 Posts: 674	l4m2 19 Jan 2021, 02:29 If they change, even pushed and later poped back, their meanings may be different
19 Jan 2021, 02:29

revolution When all else fails, read the source Joined: 24 Aug 2004 Posts: 20422 Location: In your JS exploiting you and your system	revolution 19 Jan 2021, 04:47 l4m2 wrote: Will bios call change segment registers? No.
19 Jan 2021, 04:47

sinsi Joined: 10 Aug 2007 Posts: 794 Location: Adelaide	sinsi 19 Jan 2021, 05:11 Yes, if a BIOS function returns values in a segment register IIRC some BIOSes used "unreal mode" for the move extended memory function.
19 Jan 2021, 05:11

bitshifter Joined: 04 Dec 2007 Posts: 796 Location: Massachusetts, USA	bitshifter 16 Feb 2021, 09:58 my 512 byte multi tasking micro kernel exposed bug where bios was not restoring my DS reg, it was leaving it at 0x40 BIOS data segment area _________________ Coding a 3D game engine with fasm is like trying to eat an elephant, you just have to keep focused and take it one 'byte' at a time. Last edited by bitshifter on 18 Feb 2021, 12:23; edited 1 time in total
16 Feb 2021, 09:58

revolution When all else fails, read the source Joined: 24 Aug 2004 Posts: 20422 Location: In your JS exploiting you and your system	revolution 17 Feb 2021, 06:08 bitshifter wrote: ... bug where bios was not restoring my DS reg, it was leaving it at 0x40 BIOS data segment area Which BIOS? Which function?
17 Feb 2021, 06:08

bitshifter Joined: 04 Dec 2007 Posts: 796 Location: Massachusetts, USA	bitshifter 17 Feb 2021, 16:18 was long time ago, found it https://board.flatassembler.net/topic.php?t=11115 _________________ Coding a 3D game engine with fasm is like trying to eat an elephant, you just have to keep focused and take it one 'byte' at a time.
17 Feb 2021, 16:18

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