Old BIOS question - isHWI in v4.9

Chris Thomas

All in the title really, I have to maintain an old project with an old BIOS, it has a sem_pend in a util function that can be called from an SWI/HWI etc, I need to detect this and set the timeout to zero.

Chris

over 13 years ago

0 judahvang over 13 years ago

TI__Mastermind 32475 points

Hi,

You are asking if HWI_isHWI() is available in BIOS v4.9 correct?

I don't think it is available but you should look in the documentation for the list of supported HWI APIs in that BIOS version just to confirm.

Judah

0 Chris Thomas over 13 years ago in reply to judahvang

Expert 1310 points

Hi Judah,

I know that function call is not there, but back in the old days when this was current people still needed to know the current thread context, how did they find out back then?

Chris

0 judahvang over 13 years ago in reply to Chris Thomas

TI__Mastermind 32475 points

Chris,

I think this was one of the deficiencies of BIOS in v4.9. The only thing I can think of, if you don't care whether you are in a HWI or SWI, is that you can check your current stack pointer and compare it to the ISR stack. This would tell you if you are in a HWI or SWI since TSKs have their own stack.

Judah

0 Chris Thomas over 13 years ago in reply to judahvang

Expert 1310 points

I shall probabley do it by tucking away a task type flag in each task at a point when I know why/what it is.

Is there unallocated TLS I can use?

0 judahvang over 13 years ago in reply to Chris Thomas

TI__Mastermind 32475 points

Chris,

I don't know what you mean by "unallocated TLS".

Judah

0 Chris Thomas over 13 years ago in reply to judahvang

Expert 1310 points

Does the schedulere etc use all/any thread local storage, is there any TLS?

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Old BIOS question - isHWI in v4.9