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[POWERPC] 64bit FPSCR support

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Forthcoming machines will extend the FPSCR to 64 bits.  We already
had a 64-bit save area for the FPSCR, but we need to use a new form
of the mtfsf instruction.  Fortunately this new form is decoded as
an ordinary mtfsf by existing 64-bit processors.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard
2006-06-10 20:18:39 +10:00
committed by Paul Mackerras
parent 30d8caf7c6
commit 3a2c48cfc9
3 changed files with 18 additions and 5 deletions
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6
arch/powerpc/kernel/fpu.S
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@@ -72,7 +72,7 @@ _GLOBAL(load_up_fpu)
std r12,_MSR(r1)
#endif
lfd fr0,THREAD_FPSCR(r5)
mtfsf 0xff,fr0
MTFSF_L(fr0)
REST_32FPRS(0, r5)
#ifndef CONFIG_SMP
subi r4,r5,THREAD
@@ -127,7 +127,7 @@ _GLOBAL(giveup_fpu)
_GLOBAL(cvt_fd)
lfd 0,THREAD_FPSCR(r5) /* load up fpscr value */
mtfsf 0xff,0
MTFSF_L(0)
lfs 0,0(r3)
stfd 0,0(r4)
mffs 0
@@ -136,7 +136,7 @@ _GLOBAL(cvt_fd)
_GLOBAL(cvt_df)
lfd 0,THREAD_FPSCR(r5) /* load up fpscr value */
mtfsf 0xff,0
MTFSF_L(0)
lfd 0,0(r3)
stfs 0,0(r4)
mffs 0