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Message-Id: <20220120152828.4089364-2-gatecat@ds0.me>
Date: Thu, 20 Jan 2022 15:28:27 +0000
From: Myrtle Shah <gatecat@....me>
To: linux-riscv@...ts.infradead.org, paul.walmsley@...ive.com,
palmer@...belt.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] riscv: Fix XIP_FIXUP_FLASH_OFFSET
There were several problems with the calculation. Not only was an 'and'
being computed into t1 but thrown away; but the 'and' itself would
cause problems if the granularity of the XIP physical address was less
than XIP_OFFSET - in my case I had the kernel image at 2MB in SPI flash.
I believe this approach is more generic.
Fixes: f9ace4ede49b ("riscv: remove .text section size limitation for XIP")
Signed-off-by: Myrtle Shah <gatecat@....me>
---
arch/riscv/kernel/head.S | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 604d60292dd8..b1ca65abeb1e 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -21,14 +21,13 @@
add \reg, \reg, t0
.endm
.macro XIP_FIXUP_FLASH_OFFSET reg
- la t1, __data_loc
- li t0, XIP_OFFSET_MASK
- and t1, t1, t0
- li t1, XIP_OFFSET
- sub t0, t0, t1
- sub \reg, \reg, t0
+ la t0, __data_loc
+ REG_L t1, _xip_phys_offset
+ sub \reg, \reg, t1
+ add \reg, \reg, t0
.endm
_xip_fixup: .dword CONFIG_PHYS_RAM_BASE - CONFIG_XIP_PHYS_ADDR - XIP_OFFSET
+_xip_phys_offset: .dword CONFIG_XIP_PHYS_ADDR + XIP_OFFSET
#else
.macro XIP_FIXUP_OFFSET reg
.endm
--
2.34.1
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