sparc32,leon: added some SMP comments

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 14 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/smp_32.h b/arch/sparc/include/asm/smp_32.h
index d82d7f4c0a79..d7837dcb2525 100644
--- a/arch/sparc/include/asm/smp_32.h
+++ b/arch/sparc/include/asm/smp_32.h
@@ -135,6 +135,11 @@ static inline int hard_smp_processor_id(void)
                 __asm__ __volatile__("lda [%g0] ASI_M_VIKING_TMP1, %0\n\t"
                                      "nop; nop" :
                                      "=&r" (cpuid));
+                     - leon
+                __asm__ __volatile__(   "rd %asr17, %0\n\t"
+                                        "srl %0, 0x1c, %0\n\t"
+                                        "nop\n\t" :
+                                        "=&r" (cpuid));
            See btfixup.h and btfixupprep.c to understand how a blackbox works.
          */
         __asm__ __volatile__("sethi %%hi(___b_hard_smp_processor_id), %0\n\t"
diff --git a/arch/sparc/include/asm/winmacro.h b/arch/sparc/include/asm/winmacro.h
index 5b0a06dc3bcb..a9be04b0d049 100644
--- a/arch/sparc/include/asm/winmacro.h
+++ b/arch/sparc/include/asm/winmacro.h
@@ -103,6 +103,7 @@
         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; \
@@ -118,6 +119,14 @@
         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;                        \