path: root/arch/arm64/include/asm/page.h
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authorJames Morse <>2016-04-27 17:47:07 +0100
committerWill Deacon <>2016-04-28 12:05:46 +0100
commitcabe1c81ea5be983425d117912d7883e252a3b09 (patch)
treefdaffa85d67177412f944da52ec2443c5d432c6c /arch/arm64/include/asm/page.h
parentadc9b2dfd00924e9e9b98613f36a6cb8c51f0dc6 (diff)
arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va
By enabling the MMU early in cpu_resume(), the sleep_save_sp and stack can be accessed by VA, which avoids the need to convert-addresses and clean to PoC on the suspend path. MMU setup is shared with the boot path, meaning the swapper_pg_dir is restored directly: ttbr1_el1 is no longer saved/restored. struct sleep_save_sp is removed, replacing it with a single array of pointers. cpu_do_{suspend,resume} could be further reduced to not restore: cpacr_el1, mdscr_el1, tcr_el1, vbar_el1 and sctlr_el1, all of which are set by __cpu_setup(). However these values all contain res0 bits that may be used to enable future features. Signed-off-by: James Morse <> Reviewed-by: Lorenzo Pieralisi <> Reviewed-by: Catalin Marinas <> Signed-off-by: Will Deacon <>
Diffstat (limited to 'arch/arm64/include/asm/page.h')
0 files changed, 0 insertions, 0 deletions