24 Mar
2021
24 Mar
'21
8:25 p.m.
On 3/24/21 1:22 PM, Thomas Hellström (Intel) wrote:
We also have not been careful at *all* about how _PAGE_BIT_SOFTW* are used. It's quite possible we can encode another use even in the existing bits.
Personally, I'd just try:
#define _PAGE_BIT_SOFTW5 57 /* available for programmer */
OK, I'll follow your advise here. FWIW I grepped for SW1 and it seems used in a selftest, but only for PTEs AFAICT.
Oh, and we don't care about 32-bit much anymore?
On x86, we have 64-bit PTEs when running 32-bit kernels if PAE is enabled. IOW, we can handle the majority of 32-bit CPUs out there.
But, yeah, we don't care about 32-bit. :)