This allows using addresses from XKPHYS segment. This is needed as we
access hardware registers through this segment in 64BIT configuration,
but this also lets us peek/poke bigger memory address space using
commands that work with memory on 64BIT.
With this commit, malta with 64-bit CPU finally boots into 64BIT barebox
in QEMU.
Signed-off-by: Denis Orlov <denorl2...@gmail.com>
---
arch/mips/boot/start.S | 2 ++
arch/mips/include/asm/pbl_macros.h | 11 +++++++++++
2 files changed, 13 insertions(+)
diff --git a/arch/mips/boot/start.S b/arch/mips/boot/start.S
index 5f134f9ae9..30828ad9ef 100644
--- a/arch/mips/boot/start.S
+++ b/arch/mips/boot/start.S
@@ -26,6 +26,8 @@ EXPORT(_start)
mips_disable_interrupts
+ mips64_enable_64bit_addressing
+
copy_to_link_location _start
stack_setup
diff --git a/arch/mips/include/asm/pbl_macros.h
b/arch/mips/include/asm/pbl_macros.h
index 1fba690c8c..ce169a1554 100644
--- a/arch/mips/include/asm/pbl_macros.h
+++ b/arch/mips/include/asm/pbl_macros.h
@@ -152,6 +152,17 @@
.set pop
.endm
+ .macro mips64_enable_64bit_addressing
+#ifdef CONFIG_64BIT
+ .set push
+ .set noreorder
+ mfc0 k0, CP0_STATUS
+ or k0, ST0_KX
+ mtc0 k0, CP0_STATUS
+ .set pop
+#endif
+ .endm
+
.macro mips_barebox_10h
.set push
.set noreorder
--
2.41.0
