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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-02-24 18:26:29 +0400 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-05-08 13:31:57 +0400 |
| commit | 190f1ca85d071114930dd7abe6b5d103e9d5572f (patch) | |
| tree | 27344d61659e775df00892c8a13ae2473aad29b1 /arch/arm64/include/asm/fpsimdmacros.h | |
| parent | 005f78cd88494457ed38ce817f4e3fe5d372f0cb (diff) | |
| download | linux-190f1ca85d071114930dd7abe6b5d103e9d5572f.tar.xz | |
arm64: add support for kernel mode NEON in interrupt context
This patch modifies kernel_neon_begin() and kernel_neon_end(), so
they may be called from any context. To address the case where only
a couple of registers are needed, kernel_neon_begin_partial(u32) is
introduced which takes as a parameter the number of bottom 'n' NEON
q-registers required. To mark the end of such a partial section, the
regular kernel_neon_end() should be used.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'arch/arm64/include/asm/fpsimdmacros.h')
| -rw-r--r-- | arch/arm64/include/asm/fpsimdmacros.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h index bbec599c96bd..768414d55e64 100644 --- a/arch/arm64/include/asm/fpsimdmacros.h +++ b/arch/arm64/include/asm/fpsimdmacros.h @@ -62,3 +62,38 @@ ldr w\tmpnr, [\state, #16 * 2 + 4] msr fpcr, x\tmpnr .endm + +.altmacro +.macro fpsimd_save_partial state, numnr, tmpnr1, tmpnr2 + mrs x\tmpnr1, fpsr + str w\numnr, [\state, #8] + mrs x\tmpnr2, fpcr + stp w\tmpnr1, w\tmpnr2, [\state] + adr x\tmpnr1, 0f + add \state, \state, x\numnr, lsl #4 + sub x\tmpnr1, x\tmpnr1, x\numnr, lsl #1 + br x\tmpnr1 + .irp qa, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0 + .irp qb, %(qa + 1) + stp q\qa, q\qb, [\state, # -16 * \qa - 16] + .endr + .endr +0: +.endm + +.macro fpsimd_restore_partial state, tmpnr1, tmpnr2 + ldp w\tmpnr1, w\tmpnr2, [\state] + msr fpsr, x\tmpnr1 + msr fpcr, x\tmpnr2 + adr x\tmpnr1, 0f + ldr w\tmpnr2, [\state, #8] + add \state, \state, x\tmpnr2, lsl #4 + sub x\tmpnr1, x\tmpnr1, x\tmpnr2, lsl #1 + br x\tmpnr1 + .irp qa, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0 + .irp qb, %(qa + 1) + ldp q\qa, q\qb, [\state, # -16 * \qa - 16] + .endr + .endr +0: +.endm |