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sparc: Remove superfluous FP enable

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The FP context save/restore makes only sense in the context of FP
threads.

Update #2270.
This commit is contained in:
Sebastian Huber
2015-05-29 15:54:29 +02:00
parent 8a1dc71b8e
commit 1f6cdba6e1
2 changed files with 7 additions and 22 deletions
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5
cpukit/score/cpu/sparc/cpu.c
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@@ -125,6 +125,11 @@ void _CPU_Initialize(void)
{
#if (SPARC_HAS_FPU == 1)
Context_Control_fp *pointer;
uint32_t psr;
sparc_get_psr( psr );
psr |= SPARC_PSR_EF_MASK;
sparc_set_psr( psr );
/*
* This seems to be the most appropriate way to obtain an initial

24
cpukit/score/cpu/sparc/cpu_asm.S
View File

@@ -44,17 +44,7 @@
.align 4
PUBLIC(_CPU_Context_save_fp)
SYM(_CPU_Context_save_fp):
/*
* The following enables the floating point unit.
*/
mov %psr, %o1
sethi %hi(SPARC_PSR_EF_MASK), %o2
or %o2, %lo(SPARC_PSR_EF_MASK), %o2
or %o1, %o2, %o1
mov %o1, %psr ! **** ENABLE FLOAT ACCESS ****
nop; nop; nop; ! Need three nops before EF is
ld [%o0], %o1 ! active due to pipeline delay!!!
ld [%o0], %o1
std %f0, [%o1 + FO_F1_OFFSET]
std %f2, [%o1 + F2_F3_OFFSET]
std %f4, [%o1 + F4_F5_OFFSET]
@@ -90,17 +80,7 @@ SYM(_CPU_Context_save_fp):
.align 4
PUBLIC(_CPU_Context_restore_fp)
SYM(_CPU_Context_restore_fp):
/*
* The following enables the floating point unit.
*/
mov %psr, %o1
sethi %hi(SPARC_PSR_EF_MASK), %o2
or %o2, %lo(SPARC_PSR_EF_MASK), %o2
or %o1, %o2, %o1
mov %o1, %psr ! **** ENABLE FLOAT ACCESS ****
nop; nop; nop; ! Need three nops before EF is
ld [%o0], %o1 ! active due to pipeline delay!!!
ld [%o0], %o1
ldd [%o1 + FO_F1_OFFSET], %f0
ldd [%o1 + F2_F3_OFFSET], %f2
ldd [%o1 + F4_F5_OFFSET], %f4