Blackfin: initial XIP support

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S
index be4b1bbb3918..984c78172397 100644
--- a/arch/blackfin/kernel/vmlinux.lds.S
+++ b/arch/blackfin/kernel/vmlinux.lds.S
@@ -15,7 +15,12 @@ _jiffies = _jiffies_64;
 
 SECTIONS
 {
+#ifdef CONFIG_RAMKERNEL
         . = CONFIG_BOOT_LOAD;
+#else
+        . = CONFIG_ROM_BASE;
+#endif
+
         /* Neither the text, ro_data or bss section need to be aligned
          * So pack them back to back
          */
@@ -31,6 +36,12 @@ SECTIONS
                 LOCK_TEXT
                 IRQENTRY_TEXT
                 KPROBES_TEXT
+#ifdef CONFIG_ROMKERNEL
+                __sinittext = .;
+                INIT_TEXT
+                __einittext = .;
+                EXIT_TEXT
+#endif
                 *(.text.*)
                 *(.fixup)
 
@@ -50,8 +61,14 @@ SECTIONS
 
         /* Just in case the first read only is a 32-bit access */
         RO_DATA(4)
+        __rodata_end = .;
 
+#ifdef CONFIG_ROMKERNEL
+        . = CONFIG_BOOT_LOAD;
+        .bss : AT(__rodata_end)
+#else
         .bss :
+#endif
         {
                 . = ALIGN(4);
                 ___bss_start = .;
@@ -67,7 +84,11 @@ SECTIONS
                 ___bss_stop = .;
         }
 
+#if defined(CONFIG_ROMKERNEL)
+        .data : AT(LOADADDR(.bss) + SIZEOF(.bss))
+#else
         .data :
+#endif
         {
                 __sdata = .;
                 /* This gets done first, so the glob doesn't suck it in */
@@ -94,6 +115,8 @@ SECTIONS
 
                 __edata = .;
         }
+        __data_lma = LOADADDR(.data);
+        __data_len = SIZEOF(.data);
 
         /* The init section should be last, so when we free it, it goes into
          * the general memory pool, and (hopefully) will decrease fragmentation
@@ -103,6 +126,7 @@ SECTIONS
         . = ALIGN(PAGE_SIZE);
         ___init_begin = .;
 
+#ifdef CONFIG_RAMKERNEL
         INIT_TEXT_SECTION(PAGE_SIZE)
 
         /* We have to discard exit text and such at runtime, not link time, to
@@ -125,6 +149,35 @@ SECTIONS
         }
 
         .text_l1 L1_CODE_START : AT(LOADADDR(.exit.data) + SIZEOF(.exit.data))
+#else
+        .init.data : AT(__data_lma + __data_len)
+        {
+                __sinitdata = .;
+                INIT_DATA
+                INIT_SETUP(16)
+                INIT_CALLS
+                CON_INITCALL
+                SECURITY_INITCALL
+                INIT_RAM_FS
+
+                . = ALIGN(4);
+                ___per_cpu_load = .;
+                ___per_cpu_start = .;
+                *(.data.percpu.first)
+                *(.data.percpu.page_aligned)
+                *(.data.percpu)
+                *(.data.percpu.shared_aligned)
+                ___per_cpu_end = .;
+
+                EXIT_DATA
+                __einitdata = .;
+        }
+        __init_data_lma = LOADADDR(.init.data);
+        __init_data_len = SIZEOF(.init.data);
+        __init_data_end = .;
+
+        .text_l1 L1_CODE_START : AT(__init_data_lma + __init_data_len)
+#endif
         {
                 . = ALIGN(4);
                 __stext_l1 = .;
@@ -205,7 +258,11 @@ SECTIONS
         /* Force trailing alignment of our init section so that when we
          * free our init memory, we don't leave behind a partial page.
          */
+#ifdef CONFIG_RAMKERNEL
         . = __l2_lma + __l2_len;
+#else
+        . = __init_data_end;
+#endif
         . = ALIGN(PAGE_SIZE);
         ___init_end = .;