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kernel/x86_64: use standard xstate length

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for sse/avx when found invalid

Change-Id: I1c93e5dd8de80bf155eabb55c77119349a7186ab
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3372
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
This commit is contained in:
Jérôme Duval 2020-10-31 09:23:21 +01:00
parent 5c752d3160
commit 18112d73b2
2 changed files with 2 additions and 5 deletions
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5
src/system/kernel/arch/x86/64/thread.cpp
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@ -144,11 +144,6 @@ arch_thread_init(kernel_args* args)
// Save one global valid FPU state; it will be copied in the arch dependent
// part of each new thread.
if (gHasXsave || gHasXsavec) {
if (gFPUSaveLength > sizeof(sInitialState.fpu_state)) {
panic("XSAVE FPU context is larger than allowed "
"(need at least %" B_PRIu64 " bytes)", gFPUSaveLength);
return B_ERROR;
}
memset(sInitialState.fpu_state, 0, gFPUSaveLength);
if (gHasXsavec) {
asm volatile (

2
src/system/kernel/arch/x86/arch_cpu.cpp
View File

@ -1554,6 +1554,8 @@ arch_cpu_init_post_vm(kernel_args* args)
call_all_cpus_sync(&enable_xsavemask, NULL);
get_current_cpuid(&cpuid, 0xd, 0);
gFPUSaveLength = cpuid.regs.ebx;
if (gFPUSaveLength > sizeof(sInitialState.fpu_state))
gFPUSaveLength = 832;
arch_altcodepatch_replace(ALTCODEPATCH_TAG_XSAVE,
gHasXsavec ? &_xsavec : &_xsave, 4);