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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>
This commit is contained in:
Rebecca Cran 2021-02-07 17:52:43 -07:00 committed by mergify[bot]
parent 6e131aff00
commit 84a6db75b5
3 changed files with 31 additions and 0 deletions
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10
ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.S
View File

@ -74,6 +74,16 @@ ASM_FUNC(ReadCCSIDR)
mrc p15,1,r0,c0,c0,0 @ Read current CP15 Cache Size ID Register (CCSIDR)
bx lr
// 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 (CCSIDR2)
bx lr
// UINT32
// ReadCLIDR (
// IN UINT32 CSSELR

10
ArmPkg/Library/ArmLib/Arm/ArmLibSupportV7.asm
View File

@ -78,6 +78,16 @@
mrc p15,1,r0,c0,c0,0 ; Read current CP15 Cache Size ID Register (CCSIDR)
bx lr
// 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

11
ArmPkg/Library/ArmLib/ArmLibPrivate.h
View File

@ -170,6 +170,17 @@ ReadCCSIDR (
IN UINT32 CSSELR
);
/** 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