Blackfin arch: Extend sram malloc to handle L2 SRAM.

Extend system call to alloc L2 SRAM in application.
Automatically move following sections to L2 SRAM:
1. kernel built-in l2 attribute section
2. kernel module l2 attribute section
3. elf-fdpic application l2 attribute section

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 35 insertions, 5 deletions

diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S
index 3ecc64cab3be..0896e38d6108 100644
--- a/arch/blackfin/kernel/vmlinux.lds.S
+++ b/arch/blackfin/kernel/vmlinux.lds.S
@@ -101,6 +101,11 @@ SECTIONS
 #if !L1_DATA_B_LENGTH
                 *(.l1.data.B)
 #endif
+#ifndef L2_LENGTH
+                . = ALIGN(32);
+                *(.data_l2.cacheline_aligned)
+                *(.l2.data)
+#endif
 
                 DATA_DATA
                 *(.data.*)
@@ -182,14 +187,13 @@ SECTIONS
                 *(.l1.data)
                 __edata_l1 = .;
 
-                . = ALIGN(4);
-                __sbss_l1 = .;
-                *(.l1.bss)
-
                 . = ALIGN(32);
                 *(.data_l1.cacheline_aligned)
 
                 . = ALIGN(4);
+                __sbss_l1 = .;
+                *(.l1.bss)
+                . = ALIGN(4);
                 __ebss_l1 = .;
         }
 
@@ -203,11 +207,37 @@ SECTIONS
                 . = ALIGN(4);
                 __sbss_b_l1 = .;
                 *(.l1.bss.B)
-
                 . = ALIGN(4);
                 __ebss_b_l1 = .;
         }
 
+#ifdef L2_LENGTH
+        __l2_lma_start = .;
+
+        .text_data_l2 L2_START : AT(LOADADDR(.data_b_l1) + SIZEOF(.data_b_l1))
+        {
+                . = ALIGN(4);
+                __stext_l2 = .;
+                *(.l1.text)
+                . = ALIGN(4);
+                __etext_l2 = .;
+
+                . = ALIGN(4);
+                __sdata_l2 = .;
+                *(.l1.data)
+                __edata_l2 = .;
+
+                . = ALIGN(32);
+                *(.data_l2.cacheline_aligned)
+
+                . = ALIGN(4);
+                __sbss_l2 = .;
+                *(.l1.bss)
+                . = ALIGN(4);
+                __ebss_l2 = .;
+        }
+#endif
+
         /* Force trailing alignment of our init section so that when we
          * free our init memory, we don't leave behind a partial page.
          */