[ros-dev] Kernel-mode stack layout (FPU save area, trap frames, etc.)

[KJK::Hyperion]

At 16.47 21/10/2004, you wrote:
>I have changed all the places you mentioned (I hope) and even more - still 
>the area gets written into... when I did a backtrace from the place where 
>the memory was written it seemed to be in irq_handler_0. I did not see 
>where the CPU was pointed to a TSS which it would take the stack pointer 
>for the irq handler from,

on thread switch, all the appropriate per-thread attributes (mostly 
kernel-mode stack stuff) are copied in the global CPU state (either in the 
KPCR or in CPU-specific structures like the TSS). In the thread switch code 
you should see an interrupt-critical region (cli/sti) where this operation 
is performed

>Do we have any macro like ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) ?

winnt.h and ntdef.h define an undocumented RTL_NUMBER_OF macro for Windows 
XP or higher (?)