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320 lines
7.3 KiB
320 lines
7.3 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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/* Copyright (C) 2016-2018 Netronome Systems, Inc. */ |
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#include <linux/bitops.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include "nfp_asm.h" |
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const struct cmd_tgt_act cmd_tgt_act[__CMD_TGT_MAP_SIZE] = { |
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[CMD_TGT_WRITE8_SWAP] = { 0x02, 0x42 }, |
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[CMD_TGT_WRITE32_SWAP] = { 0x02, 0x5f }, |
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[CMD_TGT_READ8] = { 0x01, 0x43 }, |
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[CMD_TGT_READ32] = { 0x00, 0x5c }, |
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[CMD_TGT_READ32_LE] = { 0x01, 0x5c }, |
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[CMD_TGT_READ32_SWAP] = { 0x02, 0x5c }, |
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[CMD_TGT_READ_LE] = { 0x01, 0x40 }, |
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[CMD_TGT_READ_SWAP_LE] = { 0x03, 0x40 }, |
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[CMD_TGT_ADD] = { 0x00, 0x47 }, |
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[CMD_TGT_ADD_IMM] = { 0x02, 0x47 }, |
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}; |
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static bool unreg_is_imm(u16 reg) |
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{ |
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return (reg & UR_REG_IMM) == UR_REG_IMM; |
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} |
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u16 br_get_offset(u64 instr) |
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{ |
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u16 addr_lo, addr_hi; |
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addr_lo = FIELD_GET(OP_BR_ADDR_LO, instr); |
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addr_hi = FIELD_GET(OP_BR_ADDR_HI, instr); |
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return (addr_hi * ((OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)) + 1)) | |
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addr_lo; |
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} |
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void br_set_offset(u64 *instr, u16 offset) |
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{ |
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u16 addr_lo, addr_hi; |
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addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); |
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addr_hi = offset != addr_lo; |
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*instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO); |
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*instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi); |
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*instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo); |
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} |
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void br_add_offset(u64 *instr, u16 offset) |
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{ |
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u16 addr; |
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addr = br_get_offset(*instr); |
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br_set_offset(instr, addr + offset); |
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} |
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static bool immed_can_modify(u64 instr) |
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{ |
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if (FIELD_GET(OP_IMMED_INV, instr) || |
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FIELD_GET(OP_IMMED_SHIFT, instr) || |
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FIELD_GET(OP_IMMED_WIDTH, instr) != IMMED_WIDTH_ALL) { |
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pr_err("Can't decode/encode immed!\n"); |
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return false; |
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} |
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return true; |
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} |
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u16 immed_get_value(u64 instr) |
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{ |
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u16 reg; |
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if (!immed_can_modify(instr)) |
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return 0; |
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reg = FIELD_GET(OP_IMMED_A_SRC, instr); |
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if (!unreg_is_imm(reg)) |
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reg = FIELD_GET(OP_IMMED_B_SRC, instr); |
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return (reg & 0xff) | FIELD_GET(OP_IMMED_IMM, instr) << 8; |
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} |
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void immed_set_value(u64 *instr, u16 immed) |
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{ |
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if (!immed_can_modify(*instr)) |
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return; |
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if (unreg_is_imm(FIELD_GET(OP_IMMED_A_SRC, *instr))) { |
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*instr &= ~FIELD_PREP(OP_IMMED_A_SRC, 0xff); |
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*instr |= FIELD_PREP(OP_IMMED_A_SRC, immed & 0xff); |
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} else { |
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*instr &= ~FIELD_PREP(OP_IMMED_B_SRC, 0xff); |
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*instr |= FIELD_PREP(OP_IMMED_B_SRC, immed & 0xff); |
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} |
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*instr &= ~OP_IMMED_IMM; |
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*instr |= FIELD_PREP(OP_IMMED_IMM, immed >> 8); |
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} |
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void immed_add_value(u64 *instr, u16 offset) |
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{ |
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u16 val; |
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if (!immed_can_modify(*instr)) |
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return; |
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val = immed_get_value(*instr); |
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immed_set_value(instr, val + offset); |
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} |
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static u16 nfp_swreg_to_unreg(swreg reg, bool is_dst) |
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{ |
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bool lm_id, lm_dec = false; |
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u16 val = swreg_value(reg); |
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switch (swreg_type(reg)) { |
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case NN_REG_GPR_A: |
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case NN_REG_GPR_B: |
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case NN_REG_GPR_BOTH: |
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return val; |
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case NN_REG_NNR: |
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return UR_REG_NN | val; |
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case NN_REG_XFER: |
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return UR_REG_XFR | val; |
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case NN_REG_LMEM: |
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lm_id = swreg_lm_idx(reg); |
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switch (swreg_lm_mode(reg)) { |
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case NN_LM_MOD_NONE: |
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if (val & ~UR_REG_LM_IDX_MAX) { |
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pr_err("LM offset too large\n"); |
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return 0; |
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} |
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return UR_REG_LM | FIELD_PREP(UR_REG_LM_IDX, lm_id) | |
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val; |
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case NN_LM_MOD_DEC: |
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lm_dec = true; |
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fallthrough; |
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case NN_LM_MOD_INC: |
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if (val) { |
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pr_err("LM offset in inc/dev mode\n"); |
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return 0; |
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} |
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return UR_REG_LM | UR_REG_LM_POST_MOD | |
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FIELD_PREP(UR_REG_LM_IDX, lm_id) | |
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FIELD_PREP(UR_REG_LM_POST_MOD_DEC, lm_dec); |
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default: |
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pr_err("bad LM mode for unrestricted operands %d\n", |
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swreg_lm_mode(reg)); |
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return 0; |
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} |
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case NN_REG_IMM: |
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if (val & ~0xff) { |
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pr_err("immediate too large\n"); |
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return 0; |
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} |
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return UR_REG_IMM_encode(val); |
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case NN_REG_NONE: |
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return is_dst ? UR_REG_NO_DST : REG_NONE; |
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} |
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pr_err("unrecognized reg encoding %08x\n", reg); |
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return 0; |
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} |
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int swreg_to_unrestricted(swreg dst, swreg lreg, swreg rreg, |
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struct nfp_insn_ur_regs *reg) |
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{ |
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memset(reg, 0, sizeof(*reg)); |
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/* Decode destination */ |
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if (swreg_type(dst) == NN_REG_IMM) |
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return -EFAULT; |
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if (swreg_type(dst) == NN_REG_GPR_B) |
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reg->dst_ab = ALU_DST_B; |
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if (swreg_type(dst) == NN_REG_GPR_BOTH) |
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reg->wr_both = true; |
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reg->dst = nfp_swreg_to_unreg(dst, true); |
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/* Decode source operands */ |
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if (swreg_type(lreg) == swreg_type(rreg) && |
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swreg_type(lreg) != NN_REG_NONE) |
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return -EFAULT; |
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if (swreg_type(lreg) == NN_REG_GPR_B || |
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swreg_type(rreg) == NN_REG_GPR_A) { |
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reg->areg = nfp_swreg_to_unreg(rreg, false); |
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reg->breg = nfp_swreg_to_unreg(lreg, false); |
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reg->swap = true; |
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} else { |
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reg->areg = nfp_swreg_to_unreg(lreg, false); |
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reg->breg = nfp_swreg_to_unreg(rreg, false); |
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} |
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reg->dst_lmextn = swreg_lmextn(dst); |
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reg->src_lmextn = swreg_lmextn(lreg) | swreg_lmextn(rreg); |
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return 0; |
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} |
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static u16 nfp_swreg_to_rereg(swreg reg, bool is_dst, bool has_imm8, bool *i8) |
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{ |
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u16 val = swreg_value(reg); |
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bool lm_id; |
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switch (swreg_type(reg)) { |
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case NN_REG_GPR_A: |
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case NN_REG_GPR_B: |
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case NN_REG_GPR_BOTH: |
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return val; |
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case NN_REG_XFER: |
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return RE_REG_XFR | val; |
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case NN_REG_LMEM: |
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lm_id = swreg_lm_idx(reg); |
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if (swreg_lm_mode(reg) != NN_LM_MOD_NONE) { |
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pr_err("bad LM mode for restricted operands %d\n", |
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swreg_lm_mode(reg)); |
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return 0; |
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} |
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if (val & ~RE_REG_LM_IDX_MAX) { |
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pr_err("LM offset too large\n"); |
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return 0; |
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} |
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return RE_REG_LM | FIELD_PREP(RE_REG_LM_IDX, lm_id) | val; |
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case NN_REG_IMM: |
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if (val & ~(0x7f | has_imm8 << 7)) { |
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pr_err("immediate too large\n"); |
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return 0; |
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} |
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*i8 = val & 0x80; |
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return RE_REG_IMM_encode(val & 0x7f); |
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case NN_REG_NONE: |
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return is_dst ? RE_REG_NO_DST : REG_NONE; |
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case NN_REG_NNR: |
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pr_err("NNRs used with restricted encoding\n"); |
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return 0; |
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} |
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pr_err("unrecognized reg encoding\n"); |
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return 0; |
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} |
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int swreg_to_restricted(swreg dst, swreg lreg, swreg rreg, |
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struct nfp_insn_re_regs *reg, bool has_imm8) |
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{ |
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memset(reg, 0, sizeof(*reg)); |
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/* Decode destination */ |
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if (swreg_type(dst) == NN_REG_IMM) |
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return -EFAULT; |
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if (swreg_type(dst) == NN_REG_GPR_B) |
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reg->dst_ab = ALU_DST_B; |
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if (swreg_type(dst) == NN_REG_GPR_BOTH) |
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reg->wr_both = true; |
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reg->dst = nfp_swreg_to_rereg(dst, true, false, NULL); |
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/* Decode source operands */ |
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if (swreg_type(lreg) == swreg_type(rreg) && |
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swreg_type(lreg) != NN_REG_NONE) |
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return -EFAULT; |
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if (swreg_type(lreg) == NN_REG_GPR_B || |
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swreg_type(rreg) == NN_REG_GPR_A) { |
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reg->areg = nfp_swreg_to_rereg(rreg, false, has_imm8, ®->i8); |
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reg->breg = nfp_swreg_to_rereg(lreg, false, has_imm8, ®->i8); |
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reg->swap = true; |
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} else { |
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reg->areg = nfp_swreg_to_rereg(lreg, false, has_imm8, ®->i8); |
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reg->breg = nfp_swreg_to_rereg(rreg, false, has_imm8, ®->i8); |
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} |
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reg->dst_lmextn = swreg_lmextn(dst); |
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reg->src_lmextn = swreg_lmextn(lreg) | swreg_lmextn(rreg); |
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return 0; |
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} |
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#define NFP_USTORE_ECC_POLY_WORDS 7 |
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#define NFP_USTORE_OP_BITS 45 |
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static const u64 nfp_ustore_ecc_polynomials[NFP_USTORE_ECC_POLY_WORDS] = { |
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0x0ff800007fffULL, |
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0x11f801ff801fULL, |
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0x1e387e0781e1ULL, |
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0x17cb8e388e22ULL, |
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0x1af5b2c93244ULL, |
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0x1f56d5525488ULL, |
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0x0daf69a46910ULL, |
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}; |
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static bool parity(u64 value) |
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{ |
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return hweight64(value) & 1; |
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} |
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int nfp_ustore_check_valid_no_ecc(u64 insn) |
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{ |
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if (insn & ~GENMASK_ULL(NFP_USTORE_OP_BITS, 0)) |
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return -EINVAL; |
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return 0; |
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} |
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u64 nfp_ustore_calc_ecc_insn(u64 insn) |
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{ |
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u8 ecc = 0; |
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int i; |
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for (i = 0; i < NFP_USTORE_ECC_POLY_WORDS; i++) |
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ecc |= parity(nfp_ustore_ecc_polynomials[i] & insn) << i; |
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return insn | (u64)ecc << NFP_USTORE_OP_BITS; |
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}
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