Add support for detecting a vmlinux.bin appended dtb and overriding
the boot arguments to match the UHI interface.
Due to the PERCPU section being empty for !SMP, but still modifying
the current address by aligning it to the page size, do not define
it for !SMP builds to allow __appended_dtb to still point to
the actual end of the data.
Signed-off-by: Jonas Gorski <jogo@xxxxxxxxxxx>
---
Changes RFC v2 -> v3
* Switched to UHI interface instead of manipulating initial_boot_params
* fixed boot on !SMP
* Changed PTR_LW to lw and PTR_LI to li to ensure 32bit loads/
comparisons are done on 64 bit
Changes RFC v1 -> v2
* changed all occurences of vmlinux to vmlinux.bin
* clarified this applies to the raw vmlinux.bin without decompressor
* s/initial_device_params/initial_boot_params/
arch/mips/Kconfig | 27 +++++++++++++++++++++++++++
arch/mips/kernel/head.S | 16 ++++++++++++++++
arch/mips/kernel/vmlinux.lds.S | 8 +++++++-
3 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 779dcae..0986619 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2672,6 +2672,33 @@ config USE_OF
config BUILTIN_DTB
bool
+choice
+ prompt "Kernel appended dtb support" if OF
+ default MIPS_NO_APPENDED_DTB
+
+ config MIPS_NO_APPENDED_DTB
+ bool "None"
+ help
+ Do not enable appended dtb support.
+
+ config MIPS_RAW_APPENDED_DTB
+ bool "vmlinux.bin"
+ help
+ With this option, the boot code will look for a device tree binary
+ DTB) appended to raw vmlinux.bin (without decompressor).
+ (e.g. cat vmlinux.bin <filename>.dtb > vmlinux_w_dtb).
+
+ This is meant as a backward compatibility convenience for those
+ systems with a bootloader that can't be upgraded to accommodate
+ the documented boot protocol using a device tree.
+
+ Beware that there is very little in terms of protection against
+ this option being confused by leftover garbage in memory that might
+ look like a DTB header after a reboot if no actual DTB is appended
+ to vmlinux.bin. Do not leave this option active in a production kernel
+ if you don't intend to always append a DTB.
+endchoice
+
endmenu
config LOCKDEP_SUPPORT
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 95afd66..4e4cc5b 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -94,6 +94,22 @@ NESTED(kernel_entry, 16, sp) # kernel entry point
jr t0
0:
+#ifdef CONFIG_MIPS_RAW_APPENDED_DTB
+ PTR_LA t0, __appended_dtb
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ li t1, 0xd00dfeed
+#else
+ li t1, 0xedfe0dd0
+#endif
+ lw t2, (t0)
+ bne t1, t2, not_found
+ nop
+
+ move a1, t0
+ PTR_LI a0, -2
+not_found:
+#endif
PTR_LA t0, __bss_start # clear .bss
LONG_S zero, (t0)
PTR_LA t1, __bss_stop - LONGSIZE
diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index 3b46f7c..07d32a4 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -125,8 +125,14 @@ SECTIONS
.exit.data : {
EXIT_DATA
}
-
+#ifdef CONFIG_SMP
PERCPU_SECTION(1 << CONFIG_MIPS_L1_CACHE_SHIFT)
+#endif
+#ifdef CONFIG_MIPS_RAW_APPENDED_DTB
+ __appended_dtb = .;
+ /* leave space for appended DTB */
+ . += 0x100000;
+#endif
/*
* Align to 64K in attempt to eliminate holes before the
* .bss..swapper_pg_dir section at the start of .bss. This
--
1.7.10.4
