src-test2/sys/powerpc/include/pcb.h, branch release/6.2.0_cvs

This commit was manufactured by cvs2svn to create tag

2007-01-11T22:54:46Z

'RELENG_6_2_0_RELEASE'. This commit was manufactured to restore the state of the 6.2-RELEASE image.

Add prototype for KDB's makectx routine

2004-07-12T22:17:20Z

Add the USER_SR segment register to pcb state. Initialize correctly,

2002-10-21T05:27:41Z

and save/restore during a context switch. The USER_SR could be overwritten when the current thread was switched out with a faulting copyin/copyout. Approved by: Benno

The a.out md_coredump stuff isn't referenced anywhere anymore, and

2002-10-15T00:02:50Z

hasn't been filled in for ages.. Nuked.

To quote Peter:

2002-06-29T09:39:44Z

The case in cpu_switch() where there isn't a higher priority thread (choosethread() == curthread) uses r4 as the PCB context pointer. However, the use of r4 after the label L2 is incorrect, since it was probably trashed by the call to choosethread, and in any case was set up to curthread at the start of the routine. This condition will occur when an interrupt thread schedules a netisr, which is a lower priority thread. Another (probably unnecessary) difference is that I was paranoid about register trashing, so I decided to save r2 and r13 as well. Submitted by: Peter Grehan

FPU support.

2002-05-13T07:44:48Z

Obtained from: NetBSD (portions)

Make fork work, at least for kthreads. Switching still has some issues.

2002-02-28T03:24:07Z

Save WIP. Partial rewrite of cpu_switch() and savectx(). This makes it closer

2001-10-15T00:37:45Z

to working but still needs some work to properly switch the full context (such as saving the fpu registers, switch stacks, etc.). Also, remove some dead code that was mixed in.

Bring in NetBSD code used in the PowerPC port.

2001-06-10T02:39:37Z

Reviewed by: obrien, dfr Obtained from: NetBSD