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Mirror of CollapseOS
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collapseos/apps
Virgil Dupras cbc6fb5931 zasm: clean up jump table requirements vor 4 Jahren
..
at28w Rename blockdev's API routines to GetB/PutB vor 4 Jahren
ed Rename blockdev's API routines to GetB/PutB vor 4 Jahren
lib Decimal parse optimisations (#45) vor 4 Jahren
memt zasm: rename #inc to .inc vor 4 Jahren
sdct Rename blockdev's API routines to GetB/PutB vor 4 Jahren
zasm zasm: clean up jump table requirements vor 4 Jahren
README.md Make userspace parse args the same way the shell does vor 5 Jahren

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.