Re: [patch] tls-2.5.31-C3

Ingo Molnar
2002-08-12T13:17:29Z

On 12 Aug 2002, Alan Cox wrote:

> Which does mean you can steal the old TLS value and put it back across
> the calls just by changing the TLS data for that process. [...]

yes - the 0x40 segment can be saved & restored safely. We have per-CPU
GDTs so nobody can modify them while the APM BIOS is executing. (assuming
preemption is disabled.)

> [...] For that matter on Windows emulation I thought Windows also needed
> 0x40 to be the same offset as the BIOS does so can't we leave it
> hardwired ?

another thing: do we want this with descriptor priviledge level 3? Because
the APM 0x40 GDT entry was a ring 0 descriptor, but that would not be
accessible to Wine or DOSEMU.

Ingo