[PATCH AUTOSEL 5.9 48/55] riscv: Set text_offset correctly for M-Mode

Sasha Levin
2020-11-10T03:54:37Z

From: Sean Anderson <seanga2@gmail.com>

[ Upstream commit 79605f1394261995c2b955c906a5a20fb27cdc84 ]

M-Mode Linux is loaded at the start of RAM, not 2MB later. Perhaps this
should be calculated based on PAGE_OFFSET somehow? Even better would be to
deprecate text_offset and instead introduce something absolute.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/riscv/kernel/head.S | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 0a4e81b8dc795..5a0ae2eaf5e2f 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -27,12 +27,17 @@ ENTRY(_start)
/* reserved */
.word 0
.balign 8
+#ifdef CONFIG_RISCV_M_MODE
+ /* Image load offset (0MB) from start of RAM for M-mode */
+ .dword 0
+#else
#if __riscv_xlen == 64
/* Image load offset(2MB) from start of RAM */
.dword 0x200000
#else
/* Image load offset(4MB) from start of RAM */
.dword 0x400000
+#endif
#endif
/* Effective size of kernel image */
.dword _end - _start
--
2.27.0