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MIPS: Introduce accessors for MSA vector registers

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Introduce accessor functions allowing the kernel to access arbitrary
vector registers using an arbitrary data format. The accessors are
implemented in assembly, using macros to avoid massive duplication, in
order to make use of the existing support for MSA with & without
toolchain support. The accessors will be used in a later patch.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Manuel Lauss <manuel.lauss@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/10572/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2015-06-22 12:20:59 +01:00
committed by Ralf Baechle
parent 6701ca2df4
commit 6b35e11442
3 changed files with 261 additions and 0 deletions
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67
arch/mips/kernel/r4k_fpu.S
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@@ -13,6 +13,7 @@
* Copyright (C) 1999, 2001 Silicon Graphics, Inc.
*/
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/errno.h>
#include <asm/fpregdef.h>
#include <asm/mipsregs.h>
@@ -274,6 +275,72 @@ LEAF(_restore_fp_context32)
END(_restore_fp_context32)
#endif
#ifdef CONFIG_CPU_HAS_MSA
.macro op_one_wr op, idx, base
.align 4
\idx: \op \idx, 0, \base
jr ra
nop
.endm
.macro op_msa_wr name, op
LEAF(\name)
.set push
.set noreorder
sll t0, a0, 4
PTR_LA t1, 0f
PTR_ADDU t0, t0, t1
jr t0
nop
op_one_wr \op, 0, a1
op_one_wr \op, 1, a1
op_one_wr \op, 2, a1
op_one_wr \op, 3, a1
op_one_wr \op, 4, a1
op_one_wr \op, 5, a1
op_one_wr \op, 6, a1
op_one_wr \op, 7, a1
op_one_wr \op, 8, a1
op_one_wr \op, 9, a1
op_one_wr \op, 10, a1
op_one_wr \op, 11, a1
op_one_wr \op, 12, a1
op_one_wr \op, 13, a1
op_one_wr \op, 14, a1
op_one_wr \op, 15, a1
op_one_wr \op, 16, a1
op_one_wr \op, 17, a1
op_one_wr \op, 18, a1
op_one_wr \op, 19, a1
op_one_wr \op, 20, a1
op_one_wr \op, 21, a1
op_one_wr \op, 22, a1
op_one_wr \op, 23, a1
op_one_wr \op, 24, a1
op_one_wr \op, 25, a1
op_one_wr \op, 26, a1
op_one_wr \op, 27, a1
op_one_wr \op, 28, a1
op_one_wr \op, 29, a1
op_one_wr \op, 30, a1
op_one_wr \op, 31, a1
.set pop
END(\name)
.endm
op_msa_wr read_msa_wr_b, st_b
op_msa_wr read_msa_wr_h, st_h
op_msa_wr read_msa_wr_w, st_w
op_msa_wr read_msa_wr_d, st_d
op_msa_wr write_msa_wr_b, ld_b
op_msa_wr write_msa_wr_h, ld_h
op_msa_wr write_msa_wr_w, ld_w
op_msa_wr write_msa_wr_d, ld_d
#endif /* CONFIG_CPU_HAS_MSA */
.set reorder
.type fault@function