ARMv7: Enable the SWP instruction (213fb2a8) · Commits · 戴 / test

The SWP instruction has been deprecated starting with the ARMv6 architecture. On ARMv7 processors with the multiprocessor extensions (like Cortex-A9), this instruction is disabled by default but it can be enabled by setting bit 10 in the System Control register. Note that setting this bit is safe even if the ARMv7 processor has the SWP instruction enabled by default. Signed-off-by:

Catalin Marinas <catalin.marinas@arm.com>

arch/arm/mm/proc-v7.S

+4 −4

Original line number	Diff line number	Diff line
		@@ -232,14 +232,14 @@ __v7_setup:
		ENDPROC(__v7_setup)

		/* AT
		* TFR EV X F I D LR
		* .EEE ..EE PUI. .T.T 4RVI ZFRS BLDP WCAM
		* TFR EV X F I D LR S
		* .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
		* rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
		* 1 0 110 0011 1.00 .111 1101 < we want
		* 1 0 110 0011 1100 .111 1101 < we want
		*/
		.type v7_crval, #object
		v7_crval:
		crval clear=0x0120c302, mmuset=0x10c0387d, ucset=0x00c0187c
		crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c

		__v7_setup_stack:
		.space 4 * 11 @ 11 registers

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