diff options
Diffstat (limited to 'lib/sbi/sbi_emulate_csr.c')
| -rw-r--r-- | lib/sbi/sbi_emulate_csr.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/lib/sbi/sbi_emulate_csr.c b/lib/sbi/sbi_emulate_csr.c new file mode 100644 index 0000000..5d6819e --- /dev/null +++ b/lib/sbi/sbi_emulate_csr.c @@ -0,0 +1,137 @@ +/* + * 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; +} |