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Diffstat (limited to '')
| -rw-r--r-- | arch/mips/include/asm/msa.h | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/arch/mips/include/asm/msa.h b/arch/mips/include/asm/msa.h new file mode 100644 index 000000000..e0a3dd523 --- /dev/null +++ b/arch/mips/include/asm/msa.h @@ -0,0 +1,278 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2013 Imagination Technologies + * Author: Paul Burton <paul.burton@mips.com> + */ +#ifndef _ASM_MSA_H +#define _ASM_MSA_H + +#include <asm/mipsregs.h> + +#ifndef __ASSEMBLY__ + +#include <asm/inst.h> + +extern void _save_msa(struct task_struct *); +extern void _restore_msa(struct task_struct *); +extern void _init_msa_upper(void); + +extern void read_msa_wr_b(unsigned idx, union fpureg *to); +extern void read_msa_wr_h(unsigned idx, union fpureg *to); +extern void read_msa_wr_w(unsigned idx, union fpureg *to); +extern void read_msa_wr_d(unsigned idx, union fpureg *to); + +/** + * read_msa_wr() - Read a single MSA vector register + * @idx: The index of the vector register to read + * @to: The FPU register union to store the registers value in + * @fmt: The format of the data in the vector register + * + * Read the value of MSA vector register idx into the FPU register + * union to, using the format fmt. + */ +static inline void read_msa_wr(unsigned idx, union fpureg *to, + enum msa_2b_fmt fmt) +{ + switch (fmt) { + case msa_fmt_b: + read_msa_wr_b(idx, to); + break; + + case msa_fmt_h: + read_msa_wr_h(idx, to); + break; + + case msa_fmt_w: + read_msa_wr_w(idx, to); + break; + + case msa_fmt_d: + read_msa_wr_d(idx, to); + break; + + default: + BUG(); + } +} + +extern void write_msa_wr_b(unsigned idx, union fpureg *from); +extern void write_msa_wr_h(unsigned idx, union fpureg *from); +extern void write_msa_wr_w(unsigned idx, union fpureg *from); +extern void write_msa_wr_d(unsigned idx, union fpureg *from); + +/** + * write_msa_wr() - Write a single MSA vector register + * @idx: The index of the vector register to write + * @from: The FPU register union to take the registers value from + * @fmt: The format of the data in the vector register + * + * Write the value from the FPU register union from into MSA vector + * register idx, using the format fmt. + */ +static inline void write_msa_wr(unsigned idx, union fpureg *from, + enum msa_2b_fmt fmt) +{ + switch (fmt) { + case msa_fmt_b: + write_msa_wr_b(idx, from); + break; + + case msa_fmt_h: + write_msa_wr_h(idx, from); + break; + + case msa_fmt_w: + write_msa_wr_w(idx, from); + break; + + case msa_fmt_d: + write_msa_wr_d(idx, from); + break; + + default: + BUG(); + } +} + +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); +} + +static inline void init_msa_upper(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; + + _init_msa_upper(); +} + +#ifndef TOOLCHAIN_SUPPORTS_MSA +/* + * Define assembler macros 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. + */ +_ASM_MACRO_2R(cfcmsa, rd, cs, + _ASM_INSN_IF_MIPS(0x787e0019 | __cs << 11 | __rd << 6) + _ASM_INSN32_IF_MM(0x587e0016 | __cs << 11 | __rd << 6)); +_ASM_MACRO_2R(ctcmsa, cd, rs, + _ASM_INSN_IF_MIPS(0x783e0019 | __rs << 11 | __cd << 6) + _ASM_INSN32_IF_MM(0x583e0016 | __rs << 11 | __cd << 6)); +#define _ASM_SET_MSA "" +#else /* TOOLCHAIN_SUPPORTS_MSA */ +#define _ASM_SET_MSA ".set\tfp=64\n\t" \ + ".set\tmsa\n\t" +#endif + +#define __BUILD_MSA_CTL_REG(name, cs) \ +static inline unsigned int read_msa_##name(void) \ +{ \ + unsigned int reg; \ + __asm__ __volatile__( \ + " .set push\n" \ + _ASM_SET_MSA \ + " 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" \ + _ASM_SET_MSA \ + " ctcmsa $" #cs ", %0\n" \ + " .set pop\n" \ + : : "r"(val)); \ +} + +__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) + +#endif /* !__ASSEMBLY__ */ + +#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 + +/* 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 */ |