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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_bitops.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_emulate_csr.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_scratch.h>
#include <sbi/sbi_timer.h>
#include <sbi/sbi_trap.h>
int sbi_emulate_csr_read(int csr_num, struct sbi_trap_regs *regs,
ulong *csr_val)
{
int ret = 0;
ulong cen = -1UL;
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
ulong prev_mode = (regs->mstatus & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
#if __riscv_xlen == 32
bool virt = (regs->mstatusH & MSTATUSH_MPV) ? TRUE : FALSE;
#else
bool virt = (regs->mstatus & MSTATUS_MPV) ? TRUE : FALSE;
#endif
if (prev_mode == PRV_U)
cen = csr_read(CSR_SCOUNTEREN);
switch (csr_num) {
case CSR_HTIMEDELTA:
if (prev_mode == PRV_S && !virt)
*csr_val = sbi_timer_get_delta(scratch);
else
ret = SBI_ENOTSUPP;
break;
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 = (virt) ? sbi_timer_virt_value(scratch):
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_HTIMEDELTAH:
if (prev_mode == PRV_S && !virt)
*csr_val = sbi_timer_get_delta(scratch) >> 32;
else
ret = SBI_ENOTSUPP;
break;
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 = (virt) ? sbi_timer_virt_value(scratch) >> 32:
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:
ret = SBI_ENOTSUPP;
break;
};
if (ret)
sbi_dprintf(scratch, "%s: hartid%d: invalid csr_num=0x%x\n",
__func__, current_hartid(), csr_num);
return ret;
}
int sbi_emulate_csr_write(int csr_num, struct sbi_trap_regs *regs,
ulong csr_val)
{
int ret = 0;
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
ulong prev_mode = (regs->mstatus & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
#if __riscv_xlen == 32
bool virt = (regs->mstatusH & MSTATUSH_MPV) ? TRUE : FALSE;
#else
bool virt = (regs->mstatus & MSTATUS_MPV) ? TRUE : FALSE;
#endif
switch (csr_num) {
case CSR_HTIMEDELTA:
if (prev_mode == PRV_S && !virt)
sbi_timer_set_delta(scratch, csr_val);
else
ret = SBI_ENOTSUPP;
break;
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_HTIMEDELTAH:
if (prev_mode == PRV_S && !virt)
sbi_timer_set_delta_upper(scratch, csr_val);
else
ret = SBI_ENOTSUPP;
break;
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:
ret = SBI_ENOTSUPP;
break;
};
if (ret)
sbi_dprintf(scratch, "%s: hartid%d: invalid csr_num=0x%x\n",
__func__, current_hartid(), csr_num);
return ret;
}
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