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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2019 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- */
- #include <sbi/riscv_asm.h>
- #include <sbi/riscv_encoding.h>
- #include <sbi/sbi_bits.h>
- #include <sbi/sbi_console.h>
- #include <sbi/sbi_emulate_csr.h>
- #include <sbi/sbi_error.h>
- #include <sbi/sbi_timer.h>
- int sbi_emulate_csr_read(int csr_num, u32 hartid, ulong mstatus,
- struct sbi_scratch *scratch, ulong *csr_val)
- {
- ulong cen = -1UL;
- if (EXTRACT_FIELD(mstatus, MSTATUS_MPP) == PRV_U)
- cen = csr_read(CSR_SCOUNTEREN);
- switch (csr_num) {
- case CSR_CYCLE:
- if (!((cen >> (CSR_CYCLE - CSR_CYCLE)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MCYCLE);
- break;
- case CSR_TIME:
- if (!((cen >> (CSR_TIME - CSR_CYCLE)) & 1))
- return -1;
- *csr_val = sbi_timer_value(scratch);
- break;
- case CSR_INSTRET:
- if (!((cen >> (CSR_INSTRET - CSR_CYCLE)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MINSTRET);
- break;
- case CSR_MHPMCOUNTER3:
- if (!((cen >> (3 + CSR_MHPMCOUNTER3 - CSR_MHPMCOUNTER3)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MHPMCOUNTER3);
- break;
- case CSR_MHPMCOUNTER4:
- if (!((cen >> (3 + CSR_MHPMCOUNTER4 - CSR_MHPMCOUNTER3)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MHPMCOUNTER4);
- break;
- #if __riscv_xlen == 32
- case CSR_CYCLEH:
- if (!((cen >> (CSR_CYCLE - CSR_CYCLE)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MCYCLEH);
- break;
- case CSR_TIMEH:
- if (!((cen >> (CSR_TIME - CSR_CYCLE)) & 1))
- return -1;
- *csr_val = sbi_timer_value(scratch) >> 32;
- break;
- case CSR_INSTRETH:
- if (!((cen >> (CSR_INSTRET - CSR_CYCLE)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MINSTRETH);
- break;
- case CSR_MHPMCOUNTER3H:
- if (!((cen >> (3 + CSR_MHPMCOUNTER3 - CSR_MHPMCOUNTER3)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MHPMCOUNTER3H);
- break;
- case CSR_MHPMCOUNTER4H:
- if (!((cen >> (3 + CSR_MHPMCOUNTER4 - CSR_MHPMCOUNTER3)) & 1))
- return -1;
- *csr_val = csr_read(CSR_MHPMCOUNTER4H);
- break;
- #endif
- case CSR_MHPMEVENT3:
- *csr_val = csr_read(CSR_MHPMEVENT3);
- break;
- case CSR_MHPMEVENT4:
- *csr_val = csr_read(CSR_MHPMEVENT4);
- break;
- default:
- sbi_printf("%s: hartid%d: invalid csr_num=0x%x\n", __func__,
- hartid, csr_num);
- return SBI_ENOTSUPP;
- };
- return 0;
- }
- int sbi_emulate_csr_write(int csr_num, u32 hartid, ulong mstatus,
- struct sbi_scratch *scratch, ulong csr_val)
- {
- switch (csr_num) {
- case CSR_CYCLE:
- csr_write(CSR_MCYCLE, csr_val);
- break;
- case CSR_INSTRET:
- csr_write(CSR_MINSTRET, csr_val);
- break;
- case CSR_MHPMCOUNTER3:
- csr_write(CSR_MHPMCOUNTER3, csr_val);
- break;
- case CSR_MHPMCOUNTER4:
- csr_write(CSR_MHPMCOUNTER4, csr_val);
- break;
- #if __riscv_xlen == 32
- case CSR_CYCLEH:
- csr_write(CSR_MCYCLEH, csr_val);
- break;
- case CSR_INSTRETH:
- csr_write(CSR_MINSTRETH, csr_val);
- break;
- case CSR_MHPMCOUNTER3H:
- csr_write(CSR_MHPMCOUNTER3H, csr_val);
- break;
- case CSR_MHPMCOUNTER4H:
- csr_write(CSR_MHPMCOUNTER4H, csr_val);
- break;
- #endif
- case CSR_MHPMEVENT3:
- csr_write(CSR_MHPMEVENT3, csr_val);
- break;
- case CSR_MHPMEVENT4:
- csr_write(CSR_MHPMEVENT4, csr_val);
- break;
- default:
- sbi_printf("%s: hartid%d: invalid csr_num=0x%x\n", __func__,
- hartid, csr_num);
- return SBI_ENOTSUPP;
- };
- return 0;
- }
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