Merge branch 'zImage_DTB_append' of git://git.linaro.org/people/nico/linux into linaro-3.0
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a1c3ea9..f38e275 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1752,6 +1752,25 @@
which in turn loads the rest the kernel image to RAM using the
MMCIF hardware block.
+config ARM_APPENDED_DTB
+ bool "Use appended device tree blob to zImage"
+ depends on OF && !ZBOOT_ROM
+ help
+ With this option, the boot code will look for a device tree binary
+ (dtb) appended to zImage
+ (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
+
+config ARM_ATAG_DTB_COMPAT
+ bool "Supplement the appended DTB with traditional ATAG information"
+ depends on ARM_APPENDED_DTB
+ help
+ Some old bootloaders can't be updated to a DTB capable one, yet
+ they provide ATAGs with memory configuration, the ramdisk address,
+ the kernel cmdline string, etc. To allow a device tree enabled
+ kernel to be used with such bootloaders, this option allows
+ zImage to extract the information from the ATAG list and store it
+ at run time into the appended DTB.
+
config CMDLINE
string "Default kernel command string"
default ""
diff --git a/arch/arm/boot/compressed/.gitignore b/arch/arm/boot/compressed/.gitignore
index c602896..e0936a1 100644
--- a/arch/arm/boot/compressed/.gitignore
+++ b/arch/arm/boot/compressed/.gitignore
@@ -5,3 +5,12 @@
piggy.lzma
vmlinux
vmlinux.lds
+
+# borrowed libfdt files
+fdt.c
+fdt.h
+fdt_ro.c
+fdt_rw.c
+fdt_wip.c
+libfdt.h
+libfdt_internal.h
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 23aad07..4b94995 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -83,21 +83,41 @@
suffix_$(CONFIG_KERNEL_LZO) = lzo
suffix_$(CONFIG_KERNEL_LZMA) = lzma
+# libfdt files for the ATAG compatibility mode
+
+libfdt := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c
+libfdt_hdrs := fdt.h libfdt.h libfdt_internal.h
+
+libfdt_objs := $(addsuffix .o, $(basename $(libfdt)))
+
+$(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
+ $(call if_changed,shipped)
+
+$(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \
+ $(addprefix $(obj)/,$(libfdt_hdrs))
+
+ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
+OBJS += $(libfdt_objs) atags_to_fdt.o
+endif
+
targets := vmlinux vmlinux.lds \
piggy.$(suffix_y) piggy.$(suffix_y).o \
font.o font.c head.o misc.o $(OBJS)
# Make sure files are removed during clean
-extra-y += piggy.gzip piggy.lzo piggy.lzma lib1funcs.S
+extra-y += piggy.gzip piggy.lzo piggy.lzma lib1funcs.S $(libfdt) $(libfdt_hdrs)
ifeq ($(CONFIG_FUNCTION_TRACER),y)
ORIG_CFLAGS := $(KBUILD_CFLAGS)
KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
endif
-ccflags-y := -fpic -fno-builtin
+ccflags-y := -fpic -fno-builtin -I$(src)
asflags-y := -Wa,-march=all
+# Supply kernel BSS size to the decompressor via a linker symbol.
+KBSS_SZ = $(shell size $(obj)/../../../../vmlinux | awk 'END{print $$3}')
+LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
# Supply ZRELADDR to the decompressor via a linker symbol.
ifneq ($(CONFIG_AUTO_ZRELADDR),y)
LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
@@ -115,7 +135,7 @@
LDFLAGS_vmlinux += -T
# For __aeabi_uidivmod
-lib1funcs = $(obj)/lib1funcs.o
+lib1funcs = $(obj)/lib1funcs.o $(obj)/../../lib/lib.a
$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S FORCE
$(call cmd,shipped)
diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c
new file mode 100644
index 0000000..d79afd7
--- /dev/null
+++ b/arch/arm/boot/compressed/atags_to_fdt.c
@@ -0,0 +1,97 @@
+#include <asm/setup.h>
+#include <libfdt.h>
+
+static int node_offset(void *fdt, const char *node_path)
+{
+ int offset = fdt_path_offset(fdt, node_path);
+ if (offset == -FDT_ERR_NOTFOUND)
+ offset = fdt_add_subnode(fdt, 0, node_path);
+ return offset;
+}
+
+static int setprop(void *fdt, const char *node_path, const char *property,
+ uint32_t *val_array, int size)
+{
+ int offset = node_offset(fdt, node_path);
+ if (offset < 0)
+ return offset;
+ return fdt_setprop(fdt, offset, property, val_array, size);
+}
+
+static int setprop_string(void *fdt, const char *node_path,
+ const char *property, const char *string)
+{
+ int offset = node_offset(fdt, node_path);
+ if (offset < 0)
+ return offset;
+ return fdt_setprop_string(fdt, offset, property, string);
+}
+
+static int setprop_cell(void *fdt, const char *node_path,
+ const char *property, uint32_t val)
+{
+ int offset = node_offset(fdt, node_path);
+ if (offset < 0)
+ return offset;
+ return fdt_setprop_cell(fdt, offset, property, val);
+}
+
+/*
+ * Convert and fold provided ATAGs into the provided FDT.
+ *
+ * REturn values:
+ * = 0 -> pretend success
+ * = 1 -> bad ATAG (may retry with another possible ATAG pointer)
+ * < 0 -> error from libfdt
+ */
+int atags_to_fdt(void *atag_list, void *fdt, int total_space)
+{
+ struct tag *atag = atag_list;
+ uint32_t mem_reg_property[16];
+ int memcount = 0;
+ int ret;
+
+ /* make sure we've got an aligned pointer */
+ if ((u32)atag_list & 0x3)
+ return 1;
+
+ /* if we get a DTB here we're done already */
+ if (*(u32 *)atag_list == fdt32_to_cpu(FDT_MAGIC))
+ return 0;
+
+ /* validate the ATAG */
+ if (atag->hdr.tag != ATAG_CORE ||
+ (atag->hdr.size != tag_size(tag_core) &&
+ atag->hdr.size != 2))
+ return 1;
+
+ /* let's give it all the room it could need */
+ ret = fdt_open_into(fdt, fdt, total_space);
+ if (ret < 0)
+ return ret;
+
+ for_each_tag(atag, atag_list) {
+ if (atag->hdr.tag == ATAG_CMDLINE) {
+ setprop_string(fdt, "/chosen", "bootargs",
+ atag->u.cmdline.cmdline);
+ } else if (atag->hdr.tag == ATAG_MEM) {
+ if (memcount >= sizeof(mem_reg_property)/sizeof(uint32_t))
+ continue;
+ mem_reg_property[memcount++] = cpu_to_fdt32(atag->u.mem.start);
+ mem_reg_property[memcount++] = cpu_to_fdt32(atag->u.mem.size);
+ } else if (atag->hdr.tag == ATAG_INITRD2) {
+ uint32_t initrd_start, initrd_size;
+ initrd_start = atag->u.initrd.start;
+ initrd_size = atag->u.initrd.size;
+ setprop_cell(fdt, "/chosen", "linux,initrd-start",
+ initrd_start);
+ setprop_cell(fdt, "/chosen", "linux,initrd-end",
+ initrd_start + initrd_size);
+ }
+ }
+
+ if (memcount)
+ setprop(fdt, "/memory", "reg", mem_reg_property, 4*memcount);
+
+ return fdt_pack(fdt);
+}
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 940b201..5a07162 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -216,6 +216,103 @@
mov r10, r6
#endif
+ mov r5, #0 @ init dtb size to 0
+#ifdef CONFIG_ARM_APPENDED_DTB
+/*
+ * r0 = delta
+ * r2 = BSS start
+ * r3 = BSS end
+ * r4 = final kernel address
+ * r5 = appended dtb size (still unknown)
+ * r6 = _edata
+ * r7 = architecture ID
+ * r8 = atags/device tree pointer
+ * r9 = size of decompressed image
+ * r10 = end of this image, including bss/stack/malloc space if non XIP
+ * r11 = GOT start
+ * r12 = GOT end
+ * sp = stack pointer
+ *
+ * if there are device trees (dtb) appended to zImage, advance r10 so that the
+ * dtb data will get relocated along with the kernel if necessary.
+ */
+
+ ldr lr, [r6, #0]
+#ifndef __ARMEB__
+ ldr r1, =0xedfe0dd0 @ sig is 0xd00dfeed big endian
+#else
+ ldr r1, =0xd00dfeed
+#endif
+ cmp lr, r1
+ bne dtb_check_done @ not found
+
+#ifdef CONFIG_ARM_ATAG_DTB_COMPAT
+ /*
+ * OK... Let's do some funky business here.
+ * If we do have a DTB appended to zImage, and we do have
+ * an ATAG list around, we want the later to be translated
+ * and folded into the former here. To be on the safe side,
+ * let's temporarily move the stack away into the malloc
+ * area. No GOT fixup has occurred yet, but none of the
+ * code we're about to call uses any global variable.
+ */
+ add sp, sp, #0x10000
+ stmfd sp!, {r0-r3, ip, lr}
+ mov r0, r8
+ mov r1, r6
+ sub r2, sp, r6
+ bl atags_to_fdt
+
+ /*
+ * If returned value is 1, there is no ATAG at the location
+ * pointed by r8. Try the typical 0x100 offset from start
+ * of RAM and hope for the best.
+ */
+ cmp r0, #1
+ sub r0, r4, #(TEXT_OFFSET - 0x100)
+ mov r1, r6
+ sub r2, sp, r6
+ blne atags_to_fdt
+
+ ldmfd sp!, {r0-r3, ip, lr}
+ sub sp, sp, #0x10000
+#endif
+
+ mov r8, r6 @ use the appended device tree
+
+ /*
+ * Make sure that the DTB doesn't end up in the final
+ * kernel's .bss area. To do so, we adjust the decompressed
+ * kernel size to compensate if that .bss size is larger
+ * than the relocated code.
+ */
+ ldr r5, =_kernel_bss_size
+ adr r1, wont_overwrite
+ sub r1, r6, r1
+ subs r1, r5, r1
+ addhi r9, r9, r1
+
+ /* Get the dtb's size */
+ ldr r5, [r6, #4]
+#ifndef __ARMEB__
+ /* convert r5 (dtb size) to little endian */
+ eor r1, r5, r5, ror #16
+ bic r1, r1, #0x00ff0000
+ mov r5, r5, ror #8
+ eor r5, r5, r1, lsr #8
+#endif
+
+ /* preserve 64-bit alignment */
+ add r5, r5, #7
+ bic r5, r5, #7
+
+ /* relocate some pointers past the appended dtb */
+ add r6, r6, r5
+ add r10, r10, r5
+ add sp, sp, r5
+dtb_check_done:
+#endif
+
/*
* Check to see if we will overwrite ourselves.
* r4 = final kernel address
@@ -223,15 +320,14 @@
* r10 = end of this image, including bss/stack/malloc space if non XIP
* We basically want:
* r4 - 16k page directory >= r10 -> OK
- * r4 + image length <= current position (pc) -> OK
+ * r4 + image length <= address of wont_overwrite -> OK
*/
add r10, r10, #16384
cmp r4, r10
bhs wont_overwrite
add r10, r4, r9
- ARM( cmp r10, pc )
- THUMB( mov lr, pc )
- THUMB( cmp r10, lr )
+ adr r9, wont_overwrite
+ cmp r10, r9
bls wont_overwrite
/*
@@ -285,14 +381,16 @@
* r2 = BSS start
* r3 = BSS end
* r4 = kernel execution address
+ * r5 = appended dtb size (0 if not present)
* r7 = architecture ID
* r8 = atags pointer
* r11 = GOT start
* r12 = GOT end
* sp = stack pointer
*/
- teq r0, #0
+ orrs r1, r0, r5
beq not_relocated
+
add r11, r11, r0
add r12, r12, r0
@@ -307,12 +405,21 @@
/*
* Relocate all entries in the GOT table.
+ * Bump bss entries to _edata + dtb size
*/
1: ldr r1, [r11, #0] @ relocate entries in the GOT
- add r1, r1, r0 @ table. This fixes up the
- str r1, [r11], #4 @ C references.
+ add r1, r1, r0 @ This fixes up C references
+ cmp r1, r2 @ if entry >= bss_start &&
+ cmphs r3, r1 @ bss_end > entry
+ addhi r1, r1, r5 @ entry += dtb size
+ str r1, [r11], #4 @ next entry
cmp r11, r12
blo 1b
+
+ /* bump our bss pointers too */
+ add r2, r2, r5
+ add r3, r3, r5
+
#else
/*
diff --git a/arch/arm/boot/compressed/libfdt_env.h b/arch/arm/boot/compressed/libfdt_env.h
new file mode 100644
index 0000000..1f4e718
--- /dev/null
+++ b/arch/arm/boot/compressed/libfdt_env.h
@@ -0,0 +1,15 @@
+#ifndef _ARM_LIBFDT_ENV_H
+#define _ARM_LIBFDT_ENV_H
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <asm/byteorder.h>
+
+#define fdt16_to_cpu(x) be16_to_cpu(x)
+#define cpu_to_fdt16(x) cpu_to_be16(x)
+#define fdt32_to_cpu(x) be32_to_cpu(x)
+#define cpu_to_fdt32(x) cpu_to_be32(x)
+#define fdt64_to_cpu(x) be64_to_cpu(x)
+#define cpu_to_fdt64(x) cpu_to_be64(x)
+
+#endif
diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
index 832d372..16c98d8 100644
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -136,6 +136,58 @@
return __dest;
}
+void *memmove(void *__dest, __const void *__src, size_t __n)
+{
+ unsigned char *d = __dest;
+ const unsigned char *s = __src;
+
+ if (__dest == __src)
+ return __dest;
+
+ if (__dest < __src)
+ return memcpy(__dest, __src, __n);
+
+ while (__n--)
+ d[__n] = s[__n];
+
+ return __dest;
+}
+
+size_t strlen(const char *s)
+{
+ const char *sc;
+
+ for (sc = s; *sc != '\0'; ++sc)
+ /* nothing */;
+ return sc - s;
+}
+
+int memcmp(const void *cs, const void *ct, size_t count)
+{
+ const unsigned char *su1, *su2;
+ int res = 0;
+
+ for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
+ if ((res = *su1 - *su2) != 0)
+ break;
+ return res;
+}
+
+int strcmp(const char *cs, const char *ct)
+{
+ unsigned char c1, c2;
+
+ while (1) {
+ c1 = *cs++;
+ c2 = *ct++;
+ if (c1 != c2)
+ return c1 < c2 ? -1 : 1;
+ if (!c1)
+ break;
+ }
+ return 0;
+}
+
/*
* gzip declarations
*/
diff --git a/arch/arm/boot/compressed/vmlinux.lds.in b/arch/arm/boot/compressed/vmlinux.lds.in
index ea80abe..6c02db1 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.in
+++ b/arch/arm/boot/compressed/vmlinux.lds.in
@@ -47,6 +47,9 @@
.got : { *(.got) }
_got_end = .;
.got.plt : { *(.got.plt) }
+
+ /* ensure the zImage file size is always a multiple of 64 bits */
+ .pad : { BYTE(0); . = ALIGN(8); }
_edata = .;
. = BSS_START;