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/*
* 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>
extern void _save_msa(struct task_struct *);
extern void _restore_msa(struct task_struct *);
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;
}
static inline int thread_msa_context_live(void)
{
/*
* Check cpu_has_msa only if it's a constant. This will allow the
* compiler to optimise out code for CPUs without MSA without adding
* an extra redundant check for CPUs with MSA.
*/
if (__builtin_constant_p(cpu_has_msa) && !cpu_has_msa)
return 0;
return test_thread_flag(TIF_MSA_CTX_LIVE);
}
static inline void save_msa(struct task_struct *t)
{
if (cpu_has_msa)
_save_msa(t);
}
static inline void restore_msa(struct task_struct *t)
{
if (cpu_has_msa)
_restore_msa(t);
}
#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" \
" ctcmsa $" #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.
*/
#ifdef CONFIG_CPU_MICROMIPS
#define CFC_MSA_INSN 0x587e0056
#define CTC_MSA_INSN 0x583e0816
#else
#define CFC_MSA_INSN 0x787e0059
#define CTC_MSA_INSN 0x783e0819
#endif
#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" \
" .insn\n" \
" .word #CFC_MSA_INSN | (" #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" \
" .insn\n" \
" .word #CTC_MSA_INSN | (" #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 */
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