ARC: Support for single cycle Close Coupled Mem (CCM)

* Includes mapping of CCMs in address space
* Annotations to move arbitrary code/data into CCM
* Moving some of the critical code/data into CCM
* Runtime detection/reporting

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
index 303ea01c85c8..8d3b0d447498 100644
--- a/arch/arc/kernel/vmlinux.lds.S
+++ b/arch/arc/kernel/vmlinux.lds.S
@@ -23,6 +23,12 @@ jiffies = jiffies_64;
 
 SECTIONS
 {
+        /*
+         * ICCM starts at 0x8000_0000. So if kernel is relocated to some other
+         * address, make sure peripheral at 0x8z doesn't clash with ICCM
+         * Essentially vector is also in ICCM.
+         */
+
         . = CONFIG_LINUX_LINK_BASE;
 
         _int_vec_base_lds = .;
@@ -31,6 +37,13 @@ SECTIONS
                 . = ALIGN(PAGE_SIZE);
         }
 
+#ifdef CONFIG_ARC_HAS_ICCM
+        .text.arcfp : {
+                *(.text.arcfp)
+                . = ALIGN(CONFIG_ARC_ICCM_SZ * 1024);
+        }
+#endif
+
         /*
          * The reason for having a seperate subsection .init.ramfs is to
          * prevent objump from including it in kernel dumps
@@ -134,4 +147,12 @@ SECTIONS
         .debug_loc 0 : { *(.debug_loc) }
         .debug_macinfo 0 : { *(.debug_macinfo) }
 
+#ifdef CONFIG_ARC_HAS_DCCM
+        . = CONFIG_ARC_DCCM_BASE;
+        __arc_dccm_base = .;
+        .data.arcfp : {
+                *(.data.arcfp)
+        }
+        . = ALIGN(CONFIG_ARC_DCCM_SZ * 1024);
+#endif
 }