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| author | H. Peter Anvin <hpa@zytor.com> | 2008-07-30 00:23:16 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-30 17:50:35 (GMT) |
| commit | 6152e4b1c99a3689fc318d092cd144597f7dbd14 (patch) | |
| tree | 8d0590b7ea931da237d037db1bbff5aa0bf1ef34 /arch/x86/kernel/i387.c | |
| parent | b4a091a62c8e91d6077e575600363cff73fa02ef (diff) | |
| download | linux-6152e4b1c99a3689fc318d092cd144597f7dbd14.tar.xz | |
x86, xsave: keep the XSAVE feature mask as an u64
The XSAVE feature mask is a 64-bit number; keep it that way, in order
to avoid the mistake done with rdmsr/wrmsr. Use the xsetbv() function
provided in the previous patch.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/i387.c')
| -rw-r--r-- | arch/x86/kernel/i387.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index e0ed59f..45723f1 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -552,18 +552,17 @@ static int restore_i387_xsave(void __user *buf) (struct i387_fxsave_struct __user *) &fx_user->_fxsr_env[0]; struct xsave_hdr_struct *xsave_hdr = ¤t->thread.xstate->xsave.xsave_hdr; - unsigned int lmask, hmask; + u64 mask; int err; if (check_for_xstate(fx, buf, &fx_sw_user)) goto fx_only; - lmask = fx_sw_user.xstate_bv; - hmask = fx_sw_user.xstate_bv >> 32; + mask = fx_sw_user.xstate_bv; err = restore_i387_fxsave(buf, fx_sw_user.xstate_size); - xsave_hdr->xstate_bv &= (pcntxt_lmask | (((u64) pcntxt_hmask) << 32)); + xsave_hdr->xstate_bv &= pcntxt_mask; /* * These bits must be zero. */ @@ -573,9 +572,8 @@ static int restore_i387_xsave(void __user *buf) * Init the state that is not present in the memory layout * and enabled by the OS. */ - lmask = ~(pcntxt_lmask & ~lmask); - hmask = ~(pcntxt_hmask & ~hmask); - xsave_hdr->xstate_bv &= (lmask | (((u64) hmask) << 32)); + mask = ~(pcntxt_mask & ~mask); + xsave_hdr->xstate_bv &= mask; return err; fx_only: |