From: Jaxson Han <jaxson.han@arm.com>
To: mark.rutland@arm.com, andre.przywara@arm.com
Cc: linux-arm-kernel@lists.infradead.org, wei.chen@arm.com,
jaxson.han@arm.com
Subject: [boot-wrapper PATCH v2 5/8] aarch64: Prepare for lower EL booting
Date: Fri, 21 May 2021 18:48:04 +0800 [thread overview]
Message-ID: <20210521104807.138269-6-jaxson.han@arm.com> (raw)
In-Reply-To: <20210521104807.138269-1-jaxson.han@arm.com>
Save SPSR_KERNEL into spsr_to_elx during el3_init.
The jump_kernel will load spsr_to_elx into spsr_el3.
This change will make it easier to control whether drop to lower EL
before jumping to the kernel.
Signed-off-by: Jaxson Han <jaxson.han@arm.com>
---
arch/aarch64/boot.S | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/aarch64/boot.S b/arch/aarch64/boot.S
index b8f9e4e..5600859 100644
--- a/arch/aarch64/boot.S
+++ b/arch/aarch64/boot.S
@@ -118,7 +118,16 @@ el3_init:
mov x0, #ZCR_EL3_LEN_MASK // SVE: Enable full vector len
msr ZCR_EL3, x0 // for EL2.
-1:
+ /*
+ * Save SPSR_KERNEL into spsr_to_elx.
+ * The jump_kernel will load spsr_to_elx into spsr_el3
+ */
+1: mov w0, #SPSR_KERNEL
+ ldr x1, =spsr_to_elx
+ str w0, [x1]
+ b el_max_init
+
+el_max_init:
ldr x0, =CNTFRQ
msr cntfrq_el0, x0
@@ -166,7 +175,7 @@ jump_kernel:
b.eq 1f
br x19 // Keep current EL
-1: ldr w4, #SPSR_KERNEL
+1: ldr w4, spsr_to_elx
/*
* If bit 0 of the kernel address is set, we're entering in AArch32
@@ -184,3 +193,5 @@ jump_kernel:
.align 3
flag_keep_el:
.long 0
+spsr_to_elx:
+ .long 0
--
2.25.1
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next prev parent reply other threads:[~2021-05-21 10:51 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-21 10:47 [boot-wrapper PATCH v2 0/8] Add Armv8-R AArch64 support Jaxson Han
2021-05-21 10:48 ` [boot-wrapper PATCH v2 1/8] Decouple V2M_SYS config by auto-detect dtb node Jaxson Han
2021-05-21 10:48 ` [boot-wrapper PATCH v2 2/8] aarch64: Rename labels and prepare for lower EL booting Jaxson Han
2021-05-24 9:32 ` Andre Przywara
2021-05-25 1:54 ` Jaxson Han
2021-05-21 10:48 ` [boot-wrapper PATCH v2 3/8] aarch64: Remove the redundant setup_stack Jaxson Han
2021-05-24 9:32 ` Andre Przywara
2021-05-21 10:48 ` [boot-wrapper PATCH v2 4/8] aarch64: Prepare for EL1 booting Jaxson Han
2021-05-24 9:32 ` Andre Przywara
2021-05-21 10:48 ` Jaxson Han [this message]
2021-05-24 9:33 ` [boot-wrapper PATCH v2 5/8] aarch64: Prepare for lower EL booting Andre Przywara
2021-05-21 10:48 ` [boot-wrapper PATCH v2 6/8] gic-v3: Prepare for gicv3 with EL2 Jaxson Han
2021-05-24 9:33 ` Andre Przywara
2021-05-21 10:48 ` [boot-wrapper PATCH v2 7/8] aarch64: Prepare for booting " Jaxson Han
2021-05-24 9:33 ` Andre Przywara
2021-05-21 10:48 ` [boot-wrapper PATCH v2 8/8] aarch64: Introduce EL2 boot code for Armv8-R AArch64 Jaxson Han
2021-05-24 10:19 ` Andre Przywara
2021-05-25 1:59 ` Jaxson Han
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