sparc32: Implement hard_smp_processor_id() via instruction patching.
This is the last non-trivial user of btfixup.
Like sparc64, use a special patch section to resolve the various
implementations of how to read the current CPU's ID when we don't
have current_thread_info()->cpu necessarily available.
Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/sparc/include/asm/winmacro.h b/arch/sparc/include/asm/winmacro.h
index a9be04b..9b7b217 100644
--- a/arch/sparc/include/asm/winmacro.h
+++ b/arch/sparc/include/asm/winmacro.h
@@ -103,37 +103,24 @@
st %scratch, [%cur_reg + TI_W_SAVED];
#ifdef CONFIG_SMP
-/* Results of LOAD_CURRENT() after BTFIXUP for SUN4M, SUN4D & LEON (comments) */
-#define LOAD_CURRENT4M(dest_reg, idreg) \
- rd %tbr, %idreg; \
- sethi %hi(current_set), %dest_reg; \
- srl %idreg, 10, %idreg; \
- or %dest_reg, %lo(current_set), %dest_reg; \
- and %idreg, 0xc, %idreg; \
- ld [%idreg + %dest_reg], %dest_reg;
-
-#define LOAD_CURRENT4D(dest_reg, idreg) \
- lda [%g0] ASI_M_VIKING_TMP1, %idreg; \
- sethi %hi(C_LABEL(current_set)), %dest_reg; \
- sll %idreg, 2, %idreg; \
- or %dest_reg, %lo(C_LABEL(current_set)), %dest_reg; \
- ld [%idreg + %dest_reg], %dest_reg;
-
-#define LOAD_CURRENT_LEON(dest_reg, idreg) \
- rd %asr17, %idreg; \
- sethi %hi(current_set), %dest_reg; \
- srl %idreg, 0x1c, %idreg; \
- or %dest_reg, %lo(current_set), %dest_reg; \
- sll %idreg, 0x2, %idreg; \
- ld [%idreg + %dest_reg], %dest_reg;
-
-/* Blackbox - take care with this... - check smp4m and smp4d before changing this. */
-#define LOAD_CURRENT(dest_reg, idreg) \
- sethi %hi(___b_load_current), %idreg; \
- sethi %hi(current_set), %dest_reg; \
- sethi %hi(boot_cpu_id4), %idreg; \
- or %dest_reg, %lo(current_set), %dest_reg; \
- ldub [%idreg + %lo(boot_cpu_id4)], %idreg; \
+#define LOAD_CURRENT(dest_reg, idreg) \
+661: rd %tbr, %idreg; \
+ srl %idreg, 10, %idreg; \
+ and %idreg, 0xc, %idreg; \
+ .section .cpuid_patch, "ax"; \
+ /* Instruction location. */ \
+ .word 661b; \
+ /* SUN4D implementation. */ \
+ lda [%g0] ASI_M_VIKING_TMP1, %idreg; \
+ sll %idreg, 2, %idreg; \
+ nop; \
+ /* LEON implementation. */ \
+ rd %asr17, %idreg; \
+ srl %idreg, 0x1c, %idreg; \
+ sll %idreg, 0x02, %idreg; \
+ .previous; \
+ sethi %hi(current_set), %dest_reg; \
+ or %dest_reg, %lo(current_set), %dest_reg;\
ld [%idreg + %dest_reg], %dest_reg;
#else
#define LOAD_CURRENT(dest_reg, idreg) \