Commit 7f65afb9 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: Add MSA register definitions & access 



This patch introduces definitions for the MSA control registers and
functions which allow access to both the control & vector registers. If
the toolchain being used to build the kernel includes support for MSA
then this patch will make use of that support & use MSA instructions
directly. However toolchain support for MSA is very new & far from a
point where it can be reasonably expected that everyone building the
kernel uses a toolchain with support. Thus fallbacks using .word
assembler directives are also provided for now as a temporary measure.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6429/
Patchwork: https://patchwork.linux-mips.org/patch/6607/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 02987633

arch/mips/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -119,6 +119,11 @@ cflags-$(CONFIG_CPU_MICROMIPS) += $(call cc-option,-mmicromips) 
cflags-$(CONFIG_SB1XXX_CORELIS)	+= $(call cc-option,-mno-sched-prolog) \

				   -fno-omit-frame-pointer



ifeq ($(CONFIG_CPU_HAS_MSA),y)

toolchain-msa			:= $(call cc-option-yn,-mhard-float -mfp64 -mmsa)

cflags-$(toolchain-msa)		+= -DTOOLCHAIN_SUPPORTS_MSA

endif



#

# CPU-dependent compiler/assembler options for optimization.

#

arch/mips/include/asm/asmmacro.h

+121 −0
Original line number Diff line number Diff line
@@ -207,4 +207,125 @@ 
	 .word	0x41800000 | (\rt << 16) | (\rd << 11) | (\u << 5) | (\sel)

	.endm



#ifdef TOOLCHAIN_SUPPORTS_MSA

	.macro	ld_d	wd, off, base

	.set	push

	.set	mips32r2

	.set	msa

	ld.d	$w\wd, \off(\base)

	.set	pop

	.endm



	.macro	st_d	wd, off, base

	.set	push

	.set	mips32r2

	.set	msa

	st.d	$w\wd, \off(\base)

	.set	pop

	.endm



	.macro	copy_u_w	rd, ws, n

	.set	push

	.set	mips32r2

	.set	msa

	copy_u.w \rd, $w\ws[\n]

	.set	pop

	.endm



	.macro	copy_u_d	rd, ws, n

	.set	push

	.set	mips64r2

	.set	msa

	copy_u.d \rd, $w\ws[\n]

	.set	pop

	.endm



	.macro	insert_w	wd, n, rs

	.set	push

	.set	mips32r2

	.set	msa

	insert.w $w\wd[\n], \rs

	.set	pop

	.endm



	.macro	insert_d	wd, n, rs

	.set	push

	.set	mips64r2

	.set	msa

	insert.d $w\wd[\n], \rs

	.set	pop

	.endm

#else

	/*

	 * Temporary until all toolchains in use include MSA support.

	 */

	.macro	cfcmsa	rd, cs

	.set	push

	.set	noat

	.word	0x787e0059 | (\cs << 11)

	move	\rd, $1

	.set	pop

	.endm



	.macro	ctcmsa	cd, rs

	.set	push

	.set	noat

	move	$1, \rs

	.word	0x783e0819 | (\cd << 6)

	.set	pop

	.endm



	.macro	ld_d	wd, off, base

	.set	push

	.set	noat

	add	$1, \base, \off

	.word	0x78000823 | (\wd << 6)

	.set	pop

	.endm



	.macro	st_d	wd, off, base

	.set	push

	.set	noat

	add	$1, \base, \off

	.word	0x78000827 | (\wd << 6)

	.set	pop

	.endm



	.macro	copy_u_w	rd, ws, n

	.set	push

	.set	noat

	.word	0x78f00059 | (\n << 16) | (\ws << 11)

	/* move triggers an assembler bug... */

	or	\rd, $1, zero

	.set	pop

	.endm



	.macro	copy_u_d	rd, ws, n

	.set	push

	.set	noat

	.word	0x78f80059 | (\n << 16) | (\ws << 11)

	/* move triggers an assembler bug... */

	or	\rd, $1, zero

	.set	pop

	.endm



	.macro	insert_w	wd, n, rs

	.set	push

	.set	noat

	/* move triggers an assembler bug... */

	or	$1, \rs, zero

	.word	0x79300819 | (\n << 16) | (\wd << 6)

	.set	pop

	.endm



	.macro	insert_d	wd, n, rs

	.set	push

	.set	noat

	/* move triggers an assembler bug... */

	or	$1, \rs, zero

	.word	0x79380819 | (\n << 16) | (\wd << 6)

	.set	pop

	.endm

#endif



#endif /* _ASM_ASMMACRO_H */

arch/mips/include/asm/mipsregs.h

+1 −0
Original line number Diff line number Diff line
@@ -1904,6 +1904,7 @@ change_c0_##name(unsigned int change, unsigned int newbits) \ 
__BUILD_SET_C0(status)

__BUILD_SET_C0(cause)

__BUILD_SET_C0(config)

__BUILD_SET_C0(config5)

__BUILD_SET_C0(intcontrol)

__BUILD_SET_C0(intctl)

__BUILD_SET_C0(srsmap)

arch/mips/include/asm/msa.h

0 → 100644
+175 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2013 Imagination Technologies

 * Author: Paul Burton <paul.burton@imgtec.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the

 * Free Software Foundation;  either version 2 of the  License, or (at your

 * option) any later version.

 */

#ifndef _ASM_MSA_H

#define _ASM_MSA_H



#include <asm/mipsregs.h>



static inline void enable_msa(void)

{

	if (cpu_has_msa) {

		set_c0_config5(MIPS_CONF5_MSAEN);

		enable_fpu_hazard();

	}

}



static inline void disable_msa(void)

{

	if (cpu_has_msa) {

		clear_c0_config5(MIPS_CONF5_MSAEN);

		disable_fpu_hazard();

	}

}



static inline int is_msa_enabled(void)

{

	if (!cpu_has_msa)

		return 0;



	return read_c0_config5() & MIPS_CONF5_MSAEN;

}



#ifdef TOOLCHAIN_SUPPORTS_MSA



#define __BUILD_MSA_CTL_REG(name, cs)				\

static inline unsigned int read_msa_##name(void)		\

{								\

	unsigned int reg;					\

	__asm__ __volatile__(					\

	"	.set	push\n"					\

	"	.set	msa\n"					\

	"	cfcmsa	%0, $" #cs "\n"				\

	"	.set	pop\n"					\

	: "=r"(reg));						\

	return reg;						\

}								\

								\

static inline void write_msa_##name(unsigned int val)		\

{								\

	__asm__ __volatile__(					\

	"	.set	push\n"					\

	"	.set	msa\n"					\

	"	cfcmsa	$" #cs ", %0\n"				\

	"	.set	pop\n"					\

	: : "r"(val));						\

}



#else /* !TOOLCHAIN_SUPPORTS_MSA */



/*

 * Define functions using .word for the c[ft]cmsa instructions in order to

 * allow compilation with toolchains that do not support MSA. Once all

 * toolchains in use support MSA these can be removed.

 */



#define __BUILD_MSA_CTL_REG(name, cs)				\

static inline unsigned int read_msa_##name(void)		\

{								\

	unsigned int reg;					\

	__asm__ __volatile__(					\

	"	.set	push\n"					\

	"	.set	noat\n"					\

	"	.word	0x787e0059 | (" #cs " << 11)\n"		\

	"	move	%0, $1\n"				\

	"	.set	pop\n"					\

	: "=r"(reg));						\

	return reg;						\

}								\

								\

static inline void write_msa_##name(unsigned int val)		\

{								\

	__asm__ __volatile__(					\

	"	.set	push\n"					\

	"	.set	noat\n"					\

	"	move	$1, %0\n"				\

	"	.word	0x783e0819 | (" #cs " << 6)\n"		\

	"	.set	pop\n"					\

	: : "r"(val));						\

}



#endif /* !TOOLCHAIN_SUPPORTS_MSA */



#define MSA_IR		0

#define MSA_CSR		1

#define MSA_ACCESS	2

#define MSA_SAVE	3

#define MSA_MODIFY	4

#define MSA_REQUEST	5

#define MSA_MAP		6

#define MSA_UNMAP	7



__BUILD_MSA_CTL_REG(ir, 0)

__BUILD_MSA_CTL_REG(csr, 1)

__BUILD_MSA_CTL_REG(access, 2)

__BUILD_MSA_CTL_REG(save, 3)

__BUILD_MSA_CTL_REG(modify, 4)

__BUILD_MSA_CTL_REG(request, 5)

__BUILD_MSA_CTL_REG(map, 6)

__BUILD_MSA_CTL_REG(unmap, 7)



/* MSA Implementation Register (MSAIR) */

#define MSA_IR_REVB		0

#define MSA_IR_REVF		(_ULCAST_(0xff) << MSA_IR_REVB)

#define MSA_IR_PROCB		8

#define MSA_IR_PROCF		(_ULCAST_(0xff) << MSA_IR_PROCB)

#define MSA_IR_WRPB		16

#define MSA_IR_WRPF		(_ULCAST_(0x1) << MSA_IR_WRPB)



/* MSA Control & Status Register (MSACSR) */

#define MSA_CSR_RMB		0

#define MSA_CSR_RMF		(_ULCAST_(0x3) << MSA_CSR_RMB)

#define MSA_CSR_RM_NEAREST	0

#define MSA_CSR_RM_TO_ZERO	1

#define MSA_CSR_RM_TO_POS	2

#define MSA_CSR_RM_TO_NEG	3

#define MSA_CSR_FLAGSB		2

#define MSA_CSR_FLAGSF		(_ULCAST_(0x1f) << MSA_CSR_FLAGSB)

#define MSA_CSR_FLAGS_IB	2

#define MSA_CSR_FLAGS_IF	(_ULCAST_(0x1) << MSA_CSR_FLAGS_IB)

#define MSA_CSR_FLAGS_UB	3

#define MSA_CSR_FLAGS_UF	(_ULCAST_(0x1) << MSA_CSR_FLAGS_UB)

#define MSA_CSR_FLAGS_OB	4

#define MSA_CSR_FLAGS_OF	(_ULCAST_(0x1) << MSA_CSR_FLAGS_OB)

#define MSA_CSR_FLAGS_ZB	5

#define MSA_CSR_FLAGS_ZF	(_ULCAST_(0x1) << MSA_CSR_FLAGS_ZB)

#define MSA_CSR_FLAGS_VB	6

#define MSA_CSR_FLAGS_VF	(_ULCAST_(0x1) << MSA_CSR_FLAGS_VB)

#define MSA_CSR_ENABLESB	7

#define MSA_CSR_ENABLESF	(_ULCAST_(0x1f) << MSA_CSR_ENABLESB)

#define MSA_CSR_ENABLES_IB	7

#define MSA_CSR_ENABLES_IF	(_ULCAST_(0x1) << MSA_CSR_ENABLES_IB)

#define MSA_CSR_ENABLES_UB	8

#define MSA_CSR_ENABLES_UF	(_ULCAST_(0x1) << MSA_CSR_ENABLES_UB)

#define MSA_CSR_ENABLES_OB	9

#define MSA_CSR_ENABLES_OF	(_ULCAST_(0x1) << MSA_CSR_ENABLES_OB)

#define MSA_CSR_ENABLES_ZB	10

#define MSA_CSR_ENABLES_ZF	(_ULCAST_(0x1) << MSA_CSR_ENABLES_ZB)

#define MSA_CSR_ENABLES_VB	11

#define MSA_CSR_ENABLES_VF	(_ULCAST_(0x1) << MSA_CSR_ENABLES_VB)

#define MSA_CSR_CAUSEB		12

#define MSA_CSR_CAUSEF		(_ULCAST_(0x3f) << MSA_CSR_CAUSEB)

#define MSA_CSR_CAUSE_IB	12

#define MSA_CSR_CAUSE_IF	(_ULCAST_(0x1) << MSA_CSR_CAUSE_IB)

#define MSA_CSR_CAUSE_UB	13

#define MSA_CSR_CAUSE_UF	(_ULCAST_(0x1) << MSA_CSR_CAUSE_UB)

#define MSA_CSR_CAUSE_OB	14

#define MSA_CSR_CAUSE_OF	(_ULCAST_(0x1) << MSA_CSR_CAUSE_OB)

#define MSA_CSR_CAUSE_ZB	15

#define MSA_CSR_CAUSE_ZF	(_ULCAST_(0x1) << MSA_CSR_CAUSE_ZB)

#define MSA_CSR_CAUSE_VB	16

#define MSA_CSR_CAUSE_VF	(_ULCAST_(0x1) << MSA_CSR_CAUSE_VB)

#define MSA_CSR_CAUSE_EB	17

#define MSA_CSR_CAUSE_EF	(_ULCAST_(0x1) << MSA_CSR_CAUSE_EB)

#define MSA_CSR_NXB		18

#define MSA_CSR_NXF		(_ULCAST_(0x1) << MSA_CSR_NXB)

#define MSA_CSR_FSB		24

#define MSA_CSR_FSF		(_ULCAST_(0x1) << MSA_CSR_FSB)



#endif /* _ASM_MSA_H */

CRA Git | Maintained and supported by SUSTech CRA and CCSE