Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-02-24 17:34:57 +00:00
Code Issues Projects Releases Packages Wiki Activity

Hopefully initialize FPU properly

Browse source 
svn path=/trunk/; revision=2242
This commit is contained in:
David Welch 2001-09-08 20:08:08 +00:00
parent 9e9c096bed
commit 8fd176384c
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
reactos/ntoskrnl/ke/i386/fpu.c
View file

@ -49,12 +49,18 @@ KiCheckFPU(VOID)
HardwareMathSupport = 0;
__asm__("movl %%cr0, %0\n\t" : "=a" (cr0));
/* Set NE and MP. */
cr0 = cr0 | 22;
__asm__("movl %0, %%cr0\n\t" : : "a" (cr0));
__asm__("clts\n\t");
__asm__("fninit\n\t");
__asm__("fstsw %0\n\t" : "=a" (status));
if (status != 0)
{
__asm__("movl %%cr0, %0\n\t" : "=a" (cr0));
/* Set the EM flag in CR0 so any FPU instructions cause a trap. */
cr0 = cr0 | 0x4;
__asm__("movl %0, %%cr0\n\t" :
: "a" (cr0));