[SPARC64]: Refine code sequences to get the cpu id.

On uniprocessor, it's always zero for optimize that.

On SMP, the jmpl to the stub kills the return address stack in the cpu
branch prediction logic, so expand the code sequence inline and use a
code patching section to fix things up.  This also always better and
explicit register selection, which will be taken advantage of in a
future changeset.

The hard_smp_processor_id() function is big, so do not inline it.

Fix up tests for Jalapeno to also test for Serrano chips too.  These
tests want "jbus Ultra-IIIi" cases to match, so that is what we should
test for.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 79 deletions

diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index 563fa4ec33f8..b3511ff5d04a 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -1628,84 +1628,10 @@ __flushw_user:
 2:	retl
 	 nop
 
-	/* Read cpu ID from hardware, return in %g6.
-	 * (callers_pc - 4) is in %g1.  Patched at boot time.
-	 *
-	 * Default is spitfire implementation.
-	 *
-	 * The instruction sequence needs to be 5 instructions
-	 * in order to fit the longest implementation, which is
-	 * currently starfire.
-	 */
-	.align		32
-	.globl		__get_cpu_id
-__get_cpu_id:
-	ldxa		[%g0] ASI_UPA_CONFIG, %g6
-	srlx		%g6, 17, %g6
-	jmpl		%g1 + 0x4, %g0
-	 and		%g6, 0x1f, %g6
-	nop
-
-__get_cpu_id_cheetah_safari:
-	ldxa		[%g0] ASI_SAFARI_CONFIG, %g6
-	srlx		%g6, 17, %g6
-	jmpl		%g1 + 0x4, %g0
-	 and		%g6, 0x3ff, %g6
-	nop
-
-__get_cpu_id_cheetah_jbus:
-	ldxa		[%g0] ASI_JBUS_CONFIG, %g6
-	srlx		%g6, 17, %g6
-	jmpl		%g1 + 0x4, %g0
-	 and		%g6, 0x1f, %g6
-	nop
-
-__get_cpu_id_starfire:
-	sethi		%hi(0x1fff40000d0 >> 9), %g6
-	sllx		%g6, 9, %g6
-	or		%g6, 0xd0, %g6
-	jmpl		%g1 + 0x4, %g0
-	 lduwa		[%g6] ASI_PHYS_BYPASS_EC_E, %g6
-
-	.globl		per_cpu_patch
-per_cpu_patch:
-	sethi		%hi(this_is_starfire), %o0
-	lduw		[%o0 + %lo(this_is_starfire)], %o1
-	sethi		%hi(__get_cpu_id_starfire), %o0
-	brnz,pn		%o1, 10f
-	 or		%o0, %lo(__get_cpu_id_starfire), %o0
-	sethi		%hi(tlb_type), %o0
-	lduw		[%o0 + %lo(tlb_type)], %o1
-	brz,pt		%o1, 11f
-	 nop
-	rdpr		%ver, %o0
-	srlx		%o0, 32, %o0
-	sethi		%hi(0x003e0016), %o1
-	or		%o1, %lo(0x003e0016), %o1
-	cmp		%o0, %o1
-	sethi		%hi(__get_cpu_id_cheetah_jbus), %o0
-	be,pn		%icc, 10f
-	 or		%o0, %lo(__get_cpu_id_cheetah_jbus), %o0
-	sethi		%hi(__get_cpu_id_cheetah_safari), %o0
-	or		%o0, %lo(__get_cpu_id_cheetah_safari), %o0
-10:
-	sethi		%hi(__get_cpu_id), %o1
-	or		%o1, %lo(__get_cpu_id), %o1
-	lduw		[%o0 + 0x00], %o2
-	stw		%o2, [%o1 + 0x00]
-	flush		%o1 + 0x00
-	lduw		[%o0 + 0x04], %o2
-	stw		%o2, [%o1 + 0x04]
-	flush		%o1 + 0x04
-	lduw		[%o0 + 0x08], %o2
-	stw		%o2, [%o1 + 0x08]
-	flush		%o1 + 0x08
-	lduw		[%o0 + 0x0c], %o2
-	stw		%o2, [%o1 + 0x0c]
-	flush		%o1 + 0x0c
-	lduw		[%o0 + 0x10], %o2
-	stw		%o2, [%o1 + 0x10]
-	flush		%o1 + 0x10
-11:
+#ifdef CONFIG_SMP
+	.globl		hard_smp_processor_id
+hard_smp_processor_id:
+	__GET_CPUID(%o0)
 	retl
 	 nop
+#endif