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817636242a
collapseos/apps
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Virgil Dupras 817636242a Add at28w app and recipe 
This allows us to write to an AT28 EEPROM from within collapse os.
2019-06-14 14:15:30 -04:00
..
at28w Add at28w app and recipe 2019-06-14 14:15:30 -04:00
sdct Add apps/sdct 2019-06-10 15:54:15 -04:00
zasm fs: further adjust to previous blkdev refactoring 2019-06-04 20:45:01 -04:00
README.md Make userspace parse args the same way the shell does 2019-06-02 14:05:20 -04:00

README.md

User applications

This folder contains code designed to be "userspace" application. Unlike the kernel, which always stay in memory. Those apps here will more likely be loaded in RAM from storage, ran, then discarded so that another userspace program can be run.

That doesn't mean that you can't include that code in your kernel though, but you will typically not want to do that.

Userspace convention

We execute a userspace application by calling the address it's loaded into. This means: a userspace application is expected to return.

Whatever calls the userspace app (usually, it will be the shell), should set HL to a pointer to unparsed arguments in string form, null terminated.

The userspace application is expected to set A on return. 0 means success, non-zero means error.