powerpc/fsl-booke: Don't hard-code size of struct tlbcam

Some assembly code in head_fsl_booke.S hard-coded the size of struct tlbcam
to 20 when it indexed the TLBCAM table.  Anyone changing the size of struct
tlbcam would not know to expect that.

The kernel already has a system to get the size of C structures into
assembly language files, asm-offsets, so let's use it.

The definition of the struct gets moved to a header, so that asm-offsets.c
can include it.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/kernel/asm-offsets.c

@@ -56,6 +56,10 @@
 #include "head_booke.h"
 #endif
 
+#if defined(CONFIG_FSL_BOOKE)
+#include "../mm/mmu_decl.h"
+#endif
+
 int main(void)
 {
 	DEFINE(THREAD, offsetof(struct task_struct, thread));
@@ -384,6 +388,9 @@ int main(void)
 	DEFINE(PGD_T_LOG2, PGD_T_LOG2);
 	DEFINE(PTE_T_LOG2, PTE_T_LOG2);
 #endif
+#ifdef CONFIG_FSL_BOOKE
+	DEFINE(TLBCAM_SIZE, sizeof(struct tlbcam));
+#endif
 
 	return 0;
 }

arch/powerpc/kernel/head_fsl_booke.S

@@ -909,7 +909,7 @@ KernelSPE:
 _GLOBAL(loadcam_entry)
 	lis	r4,TLBCAM@ha
 	addi	r4,r4,TLBCAM@l
-	mulli	r5,r3,20
+	mulli	r5,r3,TLBCAM_SIZE
 	add	r3,r5,r4
 	lwz	r4,0(r3)
 	mtspr	SPRN_MAS0,r4