Blackfin arch: Zero out bss region in L1/L2 memory.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
index 3069df580729..f123a62e2451 100644
--- a/arch/blackfin/mach-common/head.S
+++ b/arch/blackfin/mach-common/head.S
@@ -206,6 +206,60 @@ ENTRY(_real_start)
         w[p0] = r0;
         ssync;
 
+#if L1_DATA_A_LENGTH > 0
+        r1.l = __sbss_l1;
+        r1.h = __sbss_l1;
+        r2.l = __ebss_l1;
+        r2.h = __ebss_l1;
+        r0 = 0 (z);
+        r2 = r2 - r1;
+        cc = r2 == 0;
+        if cc jump .L_a_l1_done;
+        r2 >>= 2;
+        p1 = r1;
+        p2 = r2;
+        lsetup (.L_clear_a_l1, .L_clear_a_l1 ) lc0 = p2;
+.L_clear_a_l1:
+        [p1++] = r0;
+.L_a_l1_done:
+#endif
+
+#if L1_DATA_B_LENGTH > 0
+        r1.l = __sbss_b_l1;
+        r1.h = __sbss_b_l1;
+        r2.l = __ebss_b_l1;
+        r2.h = __ebss_b_l1;
+        r0 = 0 (z);
+        r2 = r2 - r1;
+        cc = r2 == 0;
+        if cc jump .L_b_l1_done;
+        r2 >>= 2;
+        p1 = r1;
+        p2 = r2;
+        lsetup (.L_clear_b_l1, .L_clear_b_l1 ) lc0 = p2;
+.L_clear_b_l1:
+        [p1++] = r0;
+.L_b_l1_done:
+#endif
+
+#if L2_LENGTH > 0
+        r1.l = __sbss_l2;
+        r1.h = __sbss_l2;
+        r2.l = __ebss_l2;
+        r2.h = __ebss_l2;
+        r0 = 0 (z);
+        r2 = r2 - r1;
+        cc = r2 == 0;
+        if cc jump .L_l2_done;
+        r2 >>= 2;
+        p1 = r1;
+        p2 = r2;
+        lsetup (.L_clear_l2, .L_clear_l2 ) lc0 = p2;
+.L_clear_l2:
+        [p1++] = r0;
+.L_l2_done:
+#endif
+
         /* Zero out the bss region
          * Note: this will fail if bss is 0 bytes ...
          */