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authorDirk Brandewie <dirk.brandewie@gmail.com>2010-12-22 22:57:26 +0300
committerGrant Likely <grant.likely@secretlab.ca>2010-12-24 00:43:00 +0300
commitaab94339cd85d726abeae78fc02351fc1910e6a4 (patch)
tree25d434a1dec4f758a9938e621dc1516f7a788521 /include/asm-generic/vmlinux.lds.h
parentcfb13c5db08c90311a5defdde9a0328ee788cca5 (diff)
downloadlinux-aab94339cd85d726abeae78fc02351fc1910e6a4.tar.xz
of: Add support for linking device tree blobs into vmlinux
This patch adds support for linking device tree blob(s) into vmlinux. Modifies asm-generic/vmlinux.lds.h to add linking .dtb sections into vmlinux. To maintain compatiblity with the of/fdt driver code platforms MUST copy the blob to a non-init memory location before the kernel frees the .init.* sections in the image. Modifies scripts/Makefile.lib to add a kbuild command to compile DTS files to device tree blobs and a rule to create objects to wrap the blobs for linking. STRUCT_ALIGNMENT is defined in vmlinux.lds.h for use in the rule to create wrapper objects for the dtb in Makefile.lib. The STRUCT_ALIGN() macro in vmlinux.lds.h is modified to use the STRUCT_ALIGNMENT definition. The DTB's are placed on 32 byte boundries to allow parsing the blob with driver/of/fdt.c during early boot without having to copy the blob to get the structure alignment GCC expects. A DTB is linked in by adding the DTB object to the list of objects to be linked into vmlinux in the archtecture specific Makefile using obj-y += foo.dtb.o Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Acked-by: Michal Marek <mmarek@suse.cz> [grant.likely@secretlab.ca: cleaned up whitespace inconsistencies] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/asm-generic/vmlinux.lds.h')
-rw-r--r--include/asm-generic/vmlinux.lds.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index bd69d79208de..05cbad03c5ab 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -67,7 +67,8 @@
* Align to a 32 byte boundary equal to the
* alignment gcc 4.5 uses for a struct
*/
-#define STRUCT_ALIGN() . = ALIGN(32)
+#define STRUCT_ALIGNMENT 32
+#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
/* The actual configuration determine if the init/exit sections
* are handled as text/data or they can be discarded (which
@@ -146,6 +147,13 @@
#define TRACE_SYSCALLS()
#endif
+
+#define KERNEL_DTB() \
+ STRUCT_ALIGN(); \
+ VMLINUX_SYMBOL(__dtb_start) = .; \
+ *(.dtb.init.rodata) \
+ VMLINUX_SYMBOL(__dtb_end) = .;
+
/* .data section */
#define DATA_DATA \
*(.data) \
@@ -468,7 +476,8 @@
MCOUNT_REC() \
DEV_DISCARD(init.rodata) \
CPU_DISCARD(init.rodata) \
- MEM_DISCARD(init.rodata)
+ MEM_DISCARD(init.rodata) \
+ KERNEL_DTB()
#define INIT_TEXT \
*(.init.text) \