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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-11-28 01:31:15 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-11-28 01:52:55 +0100 |
| commit | 4a8995ba22e0862eb8ece1d721870326669719ce (patch) | |
| tree | ed28e60d134479b4eb0c78a68f8404ddcd952568 /x86_64 | |
| parent | 0b1f1658732cd0e38ecb84a98b3bdf7a97a3b122 (diff) | |
x86: Pave the way for xsave/xrstor support
* i386/i386/fpu.h (xgetbv, get_xcr0, xsetbv, set_xcr0): New inline
functions.
(xsave, xrstor): New macros.
* i386/i386/locore.S (cpu_features): Extend to two words.
(cpu_features_edx, cpu_features_ecx): New labels.
(discover_x86_cpu_type): Also save ecx cpuid(1) report.
* x86_64/locore.S: Likewise.
* i386/i386/locore.h (cpu_features): Extend to two words.
(CPU_FEATURE_XSAVE): New macro.
* i386/i386/proc_reg.h (CR4_OSXSAVE): New macro.
Diffstat (limited to 'x86_64')
| -rw-r--r-- | x86_64/locore.S | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/x86_64/locore.S b/x86_64/locore.S index fd3617c5..612fc493 100644 --- a/x86_64/locore.S +++ b/x86_64/locore.S @@ -1259,6 +1259,9 @@ syscall_addr: .data DATA(cpu_features) +DATA(cpu_features_edx) + .long 0 +DATA(cpu_features_ecx) .long 0 .text @@ -1271,7 +1274,8 @@ ENTRY(discover_x86_cpu_type) use it to find out what we are. */ movl $1,%eax /* Fetch CPU type info ... */ cpuid /* ... into eax */ - movl %edx,cpu_features /* Keep a copy */ + movl %ecx,cpu_features_ecx /* Keep a copy */ + movl %edx,cpu_features_edx /* Keep a copy */ shrl $8,%eax /* Slide family bits down */ andl $15,%eax /* And select them */ ret /* And return */ |