[coreboot-gerrit] Change in coreboot[master]: riscv: add support move bootblock to CAR/SRAM before exection

[Xiang Wang (Code Review)]

Xiang Wang has uploaded this change for review. ( https://review.coreboot.org/27645


Change subject: riscv: add support move bootblock to CAR/SRAM before exection
......................................................................

riscv: add support move bootblock to CAR/SRAM before exection

It cannot access the data segment, if program located in masked rom.
So we can move it to CAR/SRAM before execution.

Change-Id: If1f53a7dbd7db9643bd9aeea6567cd4fae0f310e
Signed-off-by: Xiang Wang <wxjstz at 126.com>
---
M src/arch/riscv/Kconfig
M src/arch/riscv/bootblock.S
2 files changed, 29 insertions(+), 0 deletions(-)



  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/45/27645/1

diff --git a/src/arch/riscv/Kconfig b/src/arch/riscv/Kconfig
index 916e269..e36bbd6 100644
--- a/src/arch/riscv/Kconfig
+++ b/src/arch/riscv/Kconfig
@@ -28,3 +28,7 @@
 config ARCH_RAMSTAGE_RISCV
 	bool
 	default n
+
+config MOVE_BOOTBLOCK_TO_CAR
+	bool
+	default n
diff --git a/src/arch/riscv/bootblock.S b/src/arch/riscv/bootblock.S
index f92ed4b..378214c 100644
--- a/src/arch/riscv/bootblock.S
+++ b/src/arch/riscv/bootblock.S
@@ -37,6 +37,31 @@
 	# initialize cache as ram
 	call cache_as_ram
 
+	# It cannot access the data segment, if program located in masked rom.
+	# so we can move it to CAR/SRAM before execution.
+#if IS_ENABLED(CONFIG_MOVE_BOOTBLOCK_TO_CAR)
+_m2car:
+	la   a0, _program
+	la   a1, _eprogram
+	ld   a2, _program_execution_address
+	beq  a0, a2, _em2car
+1:
+	lb   t0, 0(a0)
+	sb   t0, 0(a2)
+	addi a0, a0, 1
+	addi a2, a2, 1
+	blt  a0, a1, 1b
+
+	ld   a0, _em2car_execution_address
+	jr   a0
+_program_execution_address:
+	.dword _program
+_em2car_execution_address:
+	.dword _em2car
+_em2car:
+
+#endif
+
 	# Save the FDT pointer to memory.
 	# Make mscratch vacate for exception context switching.
 	csrrw a1, mscratch, zero

-- 
To view, visit https://review.coreboot.org/27645
To unsubscribe, or for help writing mail filters, visit https://review.coreboot.org/settings

Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: If1f53a7dbd7db9643bd9aeea6567cd4fae0f310e
Gerrit-Change-Number: 27645
Gerrit-PatchSet: 1
Gerrit-Owner: Xiang Wang <wxjstz at 126.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.coreboot.org/pipermail/coreboot-gerrit/attachments/20180726/8da05719/attachment.html>