MIPS: store the appended dtb address in a variable
Instead of rewriting the arguments to match the UHI spec, store the
address of a appended or UHI supplied dtb in fw_supplied_dtb.
That way the original bootloader arugments are kept intact while still
making the use of an appended dtb invisible for mach code.
Mach code can still find out if it is an appended dtb by comparing
fw_arg1 with fw_supplied_dtb.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: John Crispin <john@phrozen.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Alban Bedel <albeu@free.fr>
Cc: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13699/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 56e8fed..cf05220 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -93,21 +93,24 @@
jr t0
0:
+#ifdef CONFIG_USE_OF
#ifdef CONFIG_MIPS_RAW_APPENDED_DTB
- PTR_LA t0, __appended_dtb
+ PTR_LA t2, __appended_dtb
#ifdef CONFIG_CPU_BIG_ENDIAN
li t1, 0xd00dfeed
#else
li t1, 0xedfe0dd0
#endif
- lw t2, (t0)
- bne t1, t2, not_found
- nop
+ lw t0, (t2)
+ beq t0, t1, dtb_found
+#endif
+ li t1, -2
+ beq a0, t1, dtb_found
+ move t2, a1
- move a1, t0
- PTR_LI a0, -2
-not_found:
+ li t2, 0
+dtb_found:
#endif
PTR_LA t0, __bss_start # clear .bss
LONG_S zero, (t0)
@@ -122,6 +125,10 @@
LONG_S a2, fw_arg2
LONG_S a3, fw_arg3
+#ifdef CONFIG_USE_OF
+ LONG_S t2, fw_passed_dtb
+#endif
+
MTC0 zero, CP0_CONTEXT # clear context register
PTR_LA $28, init_thread_union
/* Set the SP after an empty pt_regs. */