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From: "Sami Mujawar" <sami.mujawar@arm.com>
To: Rebecca Cran <rebecca@nuviainc.com>, "devel@edk2.groups.io"
<devel@edk2.groups.io>
CC: Leif Lindholm <leif@nuviainc.com>, Ard Biesheuvel
<Ard.Biesheuvel@arm.com>, nd <nd@arm.com>, Liming Gao
<gaoliming@byosoft.com.cn>, Michael D Kinney <michael.d.kinney@intel.com>,
Zhiguang Liu <zhiguang.liu@intel.com>
Subject: Re: [PATCH v6 11/22] ArmPkg: Add helper to read the CCSIDR2 register
Thread-Topic: [PATCH v6 11/22] ArmPkg: Add helper to read the CCSIDR2 register
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Date: Mon, 18 Jan 2021 08:51:49 +0000
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Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Regards,
Sami Mujawar
-----Original Message-----
From: Rebecca Cran <rebecca@nuviainc.com>=20
Sent: 14 January 2021 04:36 PM
To: devel@edk2.groups.io
Cc: Rebecca Cran <rebecca@nuviainc.com>; Leif Lindholm <leif@nuviainc.com>;=
Ard Biesheuvel <Ard.Biesheuvel@arm.com>; nd <nd@arm.com>; Sami Mujawar <Sa=
mi.Mujawar@arm.com>; Liming Gao <gaoliming@byosoft.com.cn>; Michael D Kinne=
y <michael.d.kinney@intel.com>; Zhiguang Liu <zhiguang.liu@intel.com>
Subject: [PATCH v6 11/22] ArmPkg: Add helper to read the CCSIDR2 register
Add helper function to read the CCSIDR2 register.
This is used when CCIDX is supported in AARCH32 mode.
Signed-off-by: Rebecca Cran <rebecca@nuviainc.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
---
ArmPkg/Library/ArmLib/ArmLibPrivate.h | 11 +++++++++++
ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S | 10 ++++++++++
ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm | 10 ++++++++++
3 files changed, 31 insertions(+)
diff --git a/ArmPkg/Library/ArmLib/ArmLibPrivate.h b/ArmPkg/Library/ArmLib/=
ArmLibPrivate.h
index 77e592a99def..4b72827a6522 100644
--- a/ArmPkg/Library/ArmLib/ArmLibPrivate.h
+++ b/ArmPkg/Library/ArmLib/ArmLibPrivate.h
@@ -170,6 +170,17 @@ ReadCCSIDR (
IN UINT32 CSSELR
);
=20
+/** Reads the CCSIDR2 for the specified cache.
+
+ @param CSSELR The CSSELR cache selection register value
+
+ @return The contents of the CCSIDR2 register for the specified cache.
+**/
+UINT32
+ReadCCSIDR2 (
+ IN UINT32 CSSELR
+ );
+
UINT32
ReadCLIDR (
VOID
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S b/ArmPkg/Library/A=
rmLib/Arm/ArmLibSupportV7.S
index af61dbee5261..d843f91dfca8 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S
@@ -74,6 +74,16 @@ ASM_FUNC(ReadCCSIDR)
mrc p15,1,r0,c0,c0,0 @ Read current CP15 Cache Size ID Register (CCSID=
R)
bx lr
=20
+// UINT32
+// ReadCCSIDR2 (
+// IN UINT32 CSSELR
+// )
+ASM_FUNC(ReadCCSIDR2)
+ mcr p15,2,r0,c0,c0,0 @ Write Cache Size Selection Register (CSSELR)
+ isb
+ mrc p15,1,r0,c0,c0,2 @ Read current CP15 Cache Size ID Register (CCSID=
R2)
+ bx lr
+
// UINT32
// ReadCLIDR (
// IN UINT32 CSSELR
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm b/ArmPkg/Library=
/ArmLib/Arm/ArmLibSupportV7.asm
index 81f3cb79994c..e14f1566258c 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm
@@ -78,6 +78,16 @@
mrc p15,1,r0,c0,c0,0 ; Read current CP15 Cache Size ID Register (CCSIDR)
bx lr
=20
+// UINT32
+// ReadCCSIDR2 (
+// IN UINT32 CSSELR
+// )
+ RVCT_ASM_EXPORT ReadCCSIDR2
+ mcr p15,2,r0,c0,c0,0 ; Write Cache Size Selection Register (CSSELR)
+ isb
+ mrc p15,1,r0,c0,c0,2 ; Read current CP15 Cache Size ID Register (CCSIDR2=
)
+ bx lr
+
// UINT32
// ReadCLIDR (
// IN UINT32 CSSELR
--=20
2.26.2