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Commit 3e01b998 authored by Linux Build Service Account's avatar Linux Build Service Account Committed by Gerrit - the friendly Code Review server
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Merge "arm64: Add options to disable I/D caches"

parents 675c35bd 014c397b

arch/arm64/Kconfig

+19 −0
Original line number Diff line number Diff line
@@ -204,6 +204,25 @@ endmenu 


menu "Kernel Features"



config ARM64_DCACHE_DISABLE

	bool "Disable CPU Data Caches"

	help

	  Disable CPU data cache usage by setting the SCTLR[C] bit during

	  kernel initialization. This will result in a considerable

	  performance impact, but may be useful in certain situations.



	  If you are not sure what to do, select 'N' here.



config ARM64_ICACHE_DISABLE

	bool "Disable CPU Instruction Caches"

	help

	  Disable CPU instruction cache usage by setting the SCTLR[I]

	  bit during kernel initialization. This will result in a

	  considerable performance impact, but may be useful in certain

	  situations.



	  If you are not sure what to do, select 'N' here.



config ARM64_64K_PAGES

	bool "Enable 64KB pages support"

	help

arch/arm64/mm/proc.S

+15 −2
Original line number Diff line number Diff line
@@ -235,5 +235,18 @@ ENDPROC(__cpu_setup) 
	 */

	.type	crval, #object

crval:



#ifdef CONFIG_ARM64_ICACHE_DISABLE

#define CR_IBIT		0

#else

#define CR_IBIT		0x1000

#endif



#ifdef CONFIG_ARM64_DCACHE_DISABLE

#define CR_CBIT		0

#else

#define CR_CBIT		0x4

#endif



	.word	0x000802c2	// clear

	.word	0x0405d13d			// set
 
	.word	0x0405c139 | CR_IBIT | CR_CBIT	// set