diff options
Diffstat (limited to 'sys/amd64/amd64/cpu_switch.S')
| -rw-r--r-- | sys/amd64/amd64/cpu_switch.S | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/sys/amd64/amd64/cpu_switch.S b/sys/amd64/amd64/cpu_switch.S index efb01b1..bef4b75 100644 --- a/sys/amd64/amd64/cpu_switch.S +++ b/sys/amd64/amd64/cpu_switch.S @@ -112,16 +112,25 @@ done_store_dr: /* have we used fp, and need a save? */ cmpq %rdi,PCPU(FPCURTHREAD) - jne 1f + jne 3f movq PCB_SAVEFPU(%r8),%r8 clts + cmpl $0,use_xsave + jne 1f fxsave (%r8) - smsw %ax + jmp 2f +1: movq %rdx,%rcx + movl xsave_mask,%eax + movl xsave_mask+4,%edx +/* xsave (%r8) */ + .byte 0x41,0x0f,0xae,0x20 + movq %rcx,%rdx +2: smsw %ax orb $CR0_TS,%al lmsw %ax xorl %eax,%eax movq %rax,PCPU(FPCURTHREAD) -1: +3: /* Save is done. Now fire up new thread. Leave old vmspace. */ movq TD_PCB(%rsi),%r8 @@ -354,10 +363,19 @@ ENTRY(savectx) sldt PCB_LDT(%rdi) str PCB_TR(%rdi) - clts - fxsave PCB_USERFPU(%rdi) - movq %rsi,%cr0 /* The previous %cr0 is saved in %rsi. */ +2: movq %rsi,%cr0 /* The previous %cr0 is saved in %rsi. */ movl $1,%eax ret END(savectx) + +/* + * Wrapper around fpusave to care about TS0_CR. + */ +ENTRY(ctx_fpusave) + movq %cr0,%rsi + clts + call fpusave + movq %rsi,%cr0 + ret +END(ctx_fpusave) |
