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Message-Id: <1509679664-3749-3-git-send-email-shankerd@codeaurora.org>
Date: Thu, 2 Nov 2017 22:27:43 -0500
From: Shanker Donthineni <shankerd@...eaurora.org>
To: Will Deacon <will.deacon@....com>,
Marc Zyngier <marc.zyngier@....com>,
linux-arm-kernel@...ts.infradead.org
Cc: Catalin Marinas <catalin.marinas@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Matt Fleming <matt@...eblueprint.co.uk>,
Christoffer Dall <christoffer.dall@...aro.org>,
linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
kvmarm@...ts.cs.columbia.edu,
Shanker Donthineni <shankerd@...eaurora.org>
Subject: [PATCH 2/3] arm64: Prepare SCTLR_ELn accesses to handle Falkor erratum 1041
This patch introduces two helper macros read_sctlr and write_sctlr
to access system register SCTLR_ELn. Replace all MSR/MRS references
to sctlr_el1{el2} with macros.
This should cause no behavioral change.
Signed-off-by: Shanker Donthineni <shankerd@...eaurora.org>
---
arch/arm64/include/asm/assembler.h | 18 ++++++++++++++++++
arch/arm64/kernel/cpu-reset.S | 4 ++--
arch/arm64/kernel/efi-entry.S | 8 ++++----
arch/arm64/kernel/head.S | 18 +++++++++---------
arch/arm64/kernel/relocate_kernel.S | 4 ++--
arch/arm64/kvm/hyp-init.S | 6 +++---
arch/arm64/mm/proc.S | 6 +++---
7 files changed, 41 insertions(+), 23 deletions(-)
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index d58a625..b6dfb4f 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -499,4 +499,22 @@
#endif
.endm
+/**
+ * Read value of the system control register SCTLR_ELn.
+ * eln: which system control register.
+ * reg: contents of the SCTLR_ELn.
+ */
+ .macro read_sctlr, eln, reg
+ mrs \reg, sctlr_\eln
+ .endm
+
+/**
+ * Write the value to the system control register SCTLR_ELn.
+ * eln: which system control register.
+ * reg: the value to be written.
+ */
+ .macro write_sctlr, eln, reg
+ msr sctlr_\eln, \reg
+ .endm
+
#endif /* __ASM_ASSEMBLER_H */
diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S
index 65f42d2..9224abd 100644
--- a/arch/arm64/kernel/cpu-reset.S
+++ b/arch/arm64/kernel/cpu-reset.S
@@ -34,10 +34,10 @@
*/
ENTRY(__cpu_soft_restart)
/* Clear sctlr_el1 flags. */
- mrs x12, sctlr_el1
+ read_sctlr el1, x12
ldr x13, =SCTLR_ELx_FLAGS
bic x12, x12, x13
- msr sctlr_el1, x12
+ write_sctlr el1, x12
isb
cbz x0, 1f // el2_switch?
diff --git a/arch/arm64/kernel/efi-entry.S b/arch/arm64/kernel/efi-entry.S
index 4e6ad35..acae627 100644
--- a/arch/arm64/kernel/efi-entry.S
+++ b/arch/arm64/kernel/efi-entry.S
@@ -93,17 +93,17 @@ ENTRY(entry)
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
b.ne 1f
- mrs x0, sctlr_el2
+ read_sctlr el2, x0
bic x0, x0, #1 << 0 // clear SCTLR.M
bic x0, x0, #1 << 2 // clear SCTLR.C
- msr sctlr_el2, x0
+ write_sctlr el2, x0
isb
b 2f
1:
- mrs x0, sctlr_el1
+ read_sctlr el1, x0
bic x0, x0, #1 << 0 // clear SCTLR.M
bic x0, x0, #1 << 2 // clear SCTLR.C
- msr sctlr_el1, x0
+ write_sctlr el1, x0
isb
2:
/* Jump to kernel entry point */
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 0b243ec..b8d5b73 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -388,18 +388,18 @@ ENTRY(el2_setup)
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
b.eq 1f
- mrs x0, sctlr_el1
+ read_sctlr el1, x0
CPU_BE( orr x0, x0, #(3 << 24) ) // Set the EE and E0E bits for EL1
CPU_LE( bic x0, x0, #(3 << 24) ) // Clear the EE and E0E bits for EL1
- msr sctlr_el1, x0
+ write_sctlr el1, x0
mov w0, #BOOT_CPU_MODE_EL1 // This cpu booted in EL1
isb
ret
-1: mrs x0, sctlr_el2
+1: read_sctlr el2, x0
CPU_BE( orr x0, x0, #(1 << 25) ) // Set the EE bit for EL2
CPU_LE( bic x0, x0, #(1 << 25) ) // Clear the EE bit for EL2
- msr sctlr_el2, x0
+ write_sctlr el2, x0
#ifdef CONFIG_ARM64_VHE
/*
@@ -511,7 +511,7 @@ install_el2_stub:
mov x0, #0x0800 // Set/clear RES{1,0} bits
CPU_BE( movk x0, #0x33d0, lsl #16 ) // Set EE and E0E on BE systems
CPU_LE( movk x0, #0x30d0, lsl #16 ) // Clear EE and E0E on LE systems
- msr sctlr_el1, x0
+ write_sctlr el1, x0
/* Coprocessor traps. */
mov x0, #0x33ff
@@ -664,7 +664,7 @@ ENTRY(__enable_mmu)
msr ttbr0_el1, x1 // load TTBR0
msr ttbr1_el1, x2 // load TTBR1
isb
- msr sctlr_el1, x0
+ write_sctlr el1, x0
isb
/*
* Invalidate the local I-cache so that any instructions fetched
@@ -716,7 +716,7 @@ ENDPROC(__relocate_kernel)
__primary_switch:
#ifdef CONFIG_RANDOMIZE_BASE
mov x19, x0 // preserve new SCTLR_EL1 value
- mrs x20, sctlr_el1 // preserve old SCTLR_EL1 value
+ read_sctlr el1, x20 // preserve old SCTLR_EL1 value
#endif
bl __enable_mmu
@@ -732,14 +732,14 @@ __primary_switch:
* to take into account by discarding the current kernel mapping and
* creating a new one.
*/
- msr sctlr_el1, x20 // disable the MMU
+ write_sctlr el1, x20 // disable the MMU
isb
bl __create_page_tables // recreate kernel mapping
tlbi vmalle1 // Remove any stale TLB entries
dsb nsh
- msr sctlr_el1, x19 // re-enable the MMU
+ write_sctlr el1, x19 // re-enable the MMU
isb
ic iallu // flush instructions fetched
dsb nsh // via old mapping
diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S
index ce704a4..4381c92 100644
--- a/arch/arm64/kernel/relocate_kernel.S
+++ b/arch/arm64/kernel/relocate_kernel.S
@@ -42,10 +42,10 @@ ENTRY(arm64_relocate_new_kernel)
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
b.ne 1f
- mrs x0, sctlr_el2
+ read_sctlr el2, x0
ldr x1, =SCTLR_ELx_FLAGS
bic x0, x0, x1
- msr sctlr_el2, x0
+ write_sctlr el2, x0
isb
1:
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index 3f96155..22996a3 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -113,7 +113,7 @@ __do_hyp_init:
*/
ldr x4, =(SCTLR_EL2_RES1 | (SCTLR_ELx_FLAGS & ~SCTLR_ELx_A))
CPU_BE( orr x4, x4, #SCTLR_ELx_EE)
- msr sctlr_el2, x4
+ write_sctlr el2, x4
isb
/* Set the stack and new vectors */
@@ -148,10 +148,10 @@ reset:
* Reset kvm back to the hyp stub. Do not clobber x0-x4 in
* case we coming via HVC_SOFT_RESTART.
*/
- mrs x5, sctlr_el2
+ read_sctlr el2, x5
ldr x6, =SCTLR_ELx_FLAGS
bic x5, x5, x6 // Clear SCTL_M and etc
- msr sctlr_el2, x5
+ write_sctlr el2, x5
isb
/* Install stub vectors */
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 877d42f..958c3a1 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -69,7 +69,7 @@ ENTRY(cpu_do_suspend)
mrs x7, vbar_el1
mrs x8, mdscr_el1
mrs x9, oslsr_el1
- mrs x10, sctlr_el1
+ read_sctlr el1, x10
mrs x11, tpidr_el1
mrs x12, sp_el0
stp x2, x3, [x0]
@@ -115,7 +115,7 @@ ENTRY(cpu_do_resume)
disable_dbg
msr mdscr_el1, x10
- msr sctlr_el1, x12
+ write_sctlr el1, x12
msr tpidr_el1, x13
msr sp_el0, x14
/*
@@ -217,7 +217,7 @@ ENTRY(__cpu_setup)
*/
adr x5, crval
ldp w5, w6, [x5]
- mrs x0, sctlr_el1
+ read_sctlr el1, x0
bic x0, x0, x5 // clear bits
orr x0, x0, x6 // set bits
/*
--
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