arch/arm/armv7: Make null dcache_apply_all macro for userspace
Make an empty macro for dcache_apply_all for code running in userspace so that we don't hang the system. BUG=b:161554141 TEST=Run board through a bunch of recovery cycles. Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: I3dc0f40dfe4d4a699528068154eee2d3c23d3d74 Reviewed-on: https://review.coreboot.org/c/coreboot/+/43787 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
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@ -23,6 +23,19 @@
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* THIS FUNCTION MUST PRESERVE THE VALUE OF r10
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*/
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#if ENV_USER_SPACE
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/*
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* Empty macro for code running in userspace. Trying to manipulate the
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* cache from userspace hangs the system. To run code at a privileged level,
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* the userspace code needs to execute an API call to the privileged mode
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* code.
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*/
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.macro dcache_apply_all crm
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bx lr
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.endm
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#else
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.macro dcache_apply_all crm
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dsb
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mov r3, #-2 @ initialize level so that we start at 0
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bx lr
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.endm
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#endif /* ENV_USER_SPACE */
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/*
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* Bring an ARM processor we just gained control of (e.g. from IROM) into a
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* known state regarding caches/SCTLR. Completely cleans and invalidates
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