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powerpc: Use an alternative feature section in entry_64.S

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Use an alternative feature section in _switch. There are three cases
handled here, either we don't have an SLB, in which case we jump over the
entire code section, or if we do we either do or don't have 1TB segments.

Boot tested on Power3, Power5 and Power5+.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2008-06-24 11:33:05 +10:00 committed by Paul Mackerras
parent 362e7701fd
commit c230328def
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/kernel/entry_64.S
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@ -383,16 +383,16 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
ld r8,KSP(r4) /* new stack pointer */
BEGIN_FTR_SECTION
b 2f
END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
BEGIN_FTR_SECTION
BEGIN_FTR_SECTION_NESTED(95)
clrrdi r6,r8,28 /* get its ESID */
clrrdi r9,r1,28 /* get current sp ESID */
END_FTR_SECTION_IFCLR(CPU_FTR_1T_SEGMENT)
BEGIN_FTR_SECTION
FTR_SECTION_ELSE_NESTED(95)
clrrdi r6,r8,40 /* get its 1T ESID */
clrrdi r9,r1,40 /* get current sp 1T ESID */
END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_1T_SEGMENT, 95)
FTR_SECTION_ELSE
b 2f
ALT_FTR_SECTION_END_IFSET(CPU_FTR_SLB)
clrldi. r0,r6,2 /* is new ESID c00000000? */
cmpd cr1,r6,r9 /* or is new ESID the same as current ESID? */
cror eq,4*cr1+eq,eq