Commit 10011f7d authored by Eugeniy Paltsev's avatar Eugeniy Paltsev Committed by Vineet Gupta
Browse files

ARCv2: support loop buffer (LPB) disabling 



On HS cores, loop buffer (LPB) is programmable in runtime and can
be optionally disabled.

Signed-off-by: default avatarEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 040ece2a

arch/arc/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -474,6 +474,12 @@ config ARC_IRQ_NO_AUTOSAVE 
	  This is programmable and can be optionally disabled in which case

	  software INTERRUPT_PROLOGUE/EPILGUE do the needed work



config ARC_LPB_DISABLE

	bool "Disable loop buffer (LPB)"

	help

	  On HS cores, loop buffer (LPB) is programmable in runtime and can

	  be optionally disabled.



endif # ISA_ARCV2



endmenu   # "ARC CPU Configuration"

arch/arc/kernel/head.S

+8 −0
Original line number Diff line number Diff line
@@ -59,6 +59,14 @@ 
	bclr	r5, r5, STATUS_AD_BIT

#endif

	kflag	r5



#ifdef CONFIG_ARC_LPB_DISABLE

	lr	r5, [ARC_REG_LPB_BUILD]

	breq    r5, 0, 1f		; LPB doesn't exist

	mov	r5, 1

	sr	r5, [ARC_REG_LPB_CTRL]

1:

#endif /* CONFIG_ARC_LPB_DISABLE */

#endif

	; Config DSP_CTRL properly, so kernel may use integer multiply,

	; multiply-accumulate, and divide operations