On 03/07/2016 09:56 AM, David Miller wrote:
From: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Date: Mon, 7 Mar 2016 08:07:53 -0700
PR_GET_SPARC_ADICAPS
Put this into a new ELF auxiliary vector entry via ARCH_DLINFO.
So now all that's left is supposedly the TAG stuff, please explain
that to me so I can direct you to the correct existing interface to
provide that as well.
Really, try to avoid prtctl, it's poorly typed and almost worse than
ioctl().
The two remaining operations I am looking at are:
1. Is PSTATE.mcde bit set for the process? PR_SET_SPARC_ADI provides
this in its return value in the patch I sent.
2. Is TTE.mcd set for a given virtual address? PR_GET_SPARC_ADI_STATUS
provides this function in the patch I sent.
Setting and clearing version tags can be done entirely from userspace:
while (addr < end) {
asm volatile(
"stxa %1, [%0]ASI_MCD_PRIMARY\n\t"
:
: "r" (addr), "r" (version));
addr += adicap.blksz;
}
so I do not have to add any kernel code for tags.
Thanks,
Khalid
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