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kernel: fpu_init: only enable OSXMMEXCPT in CR4 on at least SSE1 machines.

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Found and debugged by totalinux at yandex.ru and Evgeniy Ivanov, thanks!
This commit is contained in:
Ben Gras 2010-04-28 13:51:02 +00:00
parent c37401f23f
commit 50335291ae
1 changed files with 8 additions and 2 deletions
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10
kernel/arch/i386/arch_system.c
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@ -154,9 +154,15 @@ PRIVATE void fpu_init(void)
if(_cpufeature(_CPUF_I386_FXSR)) {
register struct proc *rp;
phys_bytes aligned_fp_area;
u32_t cr4 = read_cr4() | CR4_OSFXSR; /* Enable FXSR. */
/* Enable FXSR feature usage. */
write_cr4(read_cr4() | CR4_OSFXSR | CR4_OSXMMEXCPT);
/* OSXMMEXCPT if supported
* FXSR feature can be available without SSE
*/
if(_cpufeature(_CPUF_I386_SSE))
cr4 |= CR4_OSXMMEXCPT;
write_cr4(cr4);
osfxsr_feature = 1;
for (rp = BEG_PROC_ADDR; rp < END_PROC_ADDR; ++rp) {