arm64/sme: Implement context switching for ZT0

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When the system supports SME2 the ZT0 register must be context switched as
part of the floating point state. This register is stored immediately
after ZA in memory and is only accessible when PSTATE.ZA is set so we
handle it in the same functions we use to save and restore ZA.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-10-f2fa0aef982f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2023-01-16 16:04:45 +00:00 • committed by Catalin Marinas

parent d6138b4adc

commit 95fcec7132

3 changed files with 26 additions and 14 deletions

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4

arch/arm64/include/asm/fpsimd.h

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arch/arm64/kernel/entry-fpsimd.S

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6

arch/arm64/kernel/fpsimd.c

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