2 * RISC-V Control and Status Registers.
4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
5 * Copyright (c) 2017-2018 SiFive, Inc.
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2 or later, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
20 #include "qemu/osdep.h"
23 #include "qemu/main-loop.h"
24 #include "exec/exec-all.h"
26 /* CSR function table */
27 static riscv_csr_operations csr_ops
[];
29 /* CSR function table constants */
31 CSR_TABLE_SIZE
= 0x1000
34 /* CSR function table public API */
35 void riscv_get_csr_ops(int csrno
, riscv_csr_operations
*ops
)
37 *ops
= csr_ops
[csrno
& (CSR_TABLE_SIZE
- 1)];
40 void riscv_set_csr_ops(int csrno
, riscv_csr_operations
*ops
)
42 csr_ops
[csrno
& (CSR_TABLE_SIZE
- 1)] = *ops
;
46 static int fs(CPURISCVState
*env
, int csrno
)
48 #if !defined(CONFIG_USER_ONLY)
49 if (!(env
->mstatus
& MSTATUS_FS
)) {
56 static int ctr(CPURISCVState
*env
, int csrno
)
58 #if !defined(CONFIG_USER_ONLY)
59 uint32_t ctr_en
= ~0u;
61 if (env
->priv
< PRV_M
) {
62 ctr_en
&= env
->mcounteren
;
64 if (env
->priv
< PRV_S
) {
65 ctr_en
&= env
->scounteren
;
67 if (!(ctr_en
& (1u << (csrno
& 31)))) {
74 #if !defined(CONFIG_USER_ONLY)
75 static int any(CPURISCVState
*env
, int csrno
)
80 static int smode(CPURISCVState
*env
, int csrno
)
82 return -!riscv_has_ext(env
, RVS
);
85 static int pmp(CPURISCVState
*env
, int csrno
)
87 return -!riscv_feature(env
, RISCV_FEATURE_PMP
);
91 /* User Floating-Point CSRs */
92 static int read_fflags(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
94 #if !defined(CONFIG_USER_ONLY)
95 if (!(env
->mstatus
& MSTATUS_FS
)) {
99 *val
= riscv_cpu_get_fflags(env
);
103 static int write_fflags(CPURISCVState
*env
, int csrno
, target_ulong val
)
105 #if !defined(CONFIG_USER_ONLY)
106 if (!(env
->mstatus
& MSTATUS_FS
)) {
109 env
->mstatus
|= MSTATUS_FS
;
111 riscv_cpu_set_fflags(env
, val
& (FSR_AEXC
>> FSR_AEXC_SHIFT
));
115 static int read_frm(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
117 #if !defined(CONFIG_USER_ONLY)
118 if (!(env
->mstatus
& MSTATUS_FS
)) {
126 static int write_frm(CPURISCVState
*env
, int csrno
, target_ulong val
)
128 #if !defined(CONFIG_USER_ONLY)
129 if (!(env
->mstatus
& MSTATUS_FS
)) {
132 env
->mstatus
|= MSTATUS_FS
;
134 env
->frm
= val
& (FSR_RD
>> FSR_RD_SHIFT
);
138 static int read_fcsr(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
140 #if !defined(CONFIG_USER_ONLY)
141 if (!(env
->mstatus
& MSTATUS_FS
)) {
145 *val
= (riscv_cpu_get_fflags(env
) << FSR_AEXC_SHIFT
)
146 | (env
->frm
<< FSR_RD_SHIFT
);
150 static int write_fcsr(CPURISCVState
*env
, int csrno
, target_ulong val
)
152 #if !defined(CONFIG_USER_ONLY)
153 if (!(env
->mstatus
& MSTATUS_FS
)) {
156 env
->mstatus
|= MSTATUS_FS
;
158 env
->frm
= (val
& FSR_RD
) >> FSR_RD_SHIFT
;
159 riscv_cpu_set_fflags(env
, (val
& FSR_AEXC
) >> FSR_AEXC_SHIFT
);
163 /* User Timers and Counters */
164 static int read_instret(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
166 #if !defined(CONFIG_USER_ONLY)
168 *val
= cpu_get_icount();
170 *val
= cpu_get_host_ticks();
173 *val
= cpu_get_host_ticks();
178 #if defined(TARGET_RISCV32)
179 static int read_instreth(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
181 #if !defined(CONFIG_USER_ONLY)
183 *val
= cpu_get_icount() >> 32;
185 *val
= cpu_get_host_ticks() >> 32;
188 *val
= cpu_get_host_ticks() >> 32;
192 #endif /* TARGET_RISCV32 */
194 #if defined(CONFIG_USER_ONLY)
195 static int read_time(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
197 *val
= cpu_get_host_ticks();
201 #if defined(TARGET_RISCV32)
202 static int read_timeh(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
204 *val
= cpu_get_host_ticks() >> 32;
209 #else /* CONFIG_USER_ONLY */
211 /* Machine constants */
213 #define M_MODE_INTERRUPTS (MIP_MSIP | MIP_MTIP | MIP_MEIP)
214 #define S_MODE_INTERRUPTS (MIP_SSIP | MIP_STIP | MIP_SEIP)
216 static const target_ulong delegable_ints
= S_MODE_INTERRUPTS
;
217 static const target_ulong all_ints
= M_MODE_INTERRUPTS
| S_MODE_INTERRUPTS
;
218 static const target_ulong delegable_excps
=
219 (1ULL << (RISCV_EXCP_INST_ADDR_MIS
)) |
220 (1ULL << (RISCV_EXCP_INST_ACCESS_FAULT
)) |
221 (1ULL << (RISCV_EXCP_ILLEGAL_INST
)) |
222 (1ULL << (RISCV_EXCP_BREAKPOINT
)) |
223 (1ULL << (RISCV_EXCP_LOAD_ADDR_MIS
)) |
224 (1ULL << (RISCV_EXCP_LOAD_ACCESS_FAULT
)) |
225 (1ULL << (RISCV_EXCP_STORE_AMO_ADDR_MIS
)) |
226 (1ULL << (RISCV_EXCP_STORE_AMO_ACCESS_FAULT
)) |
227 (1ULL << (RISCV_EXCP_U_ECALL
)) |
228 (1ULL << (RISCV_EXCP_S_ECALL
)) |
229 (1ULL << (RISCV_EXCP_H_ECALL
)) |
230 (1ULL << (RISCV_EXCP_M_ECALL
)) |
231 (1ULL << (RISCV_EXCP_INST_PAGE_FAULT
)) |
232 (1ULL << (RISCV_EXCP_LOAD_PAGE_FAULT
)) |
233 (1ULL << (RISCV_EXCP_STORE_PAGE_FAULT
));
234 static const target_ulong sstatus_v1_9_mask
= SSTATUS_SIE
| SSTATUS_SPIE
|
235 SSTATUS_UIE
| SSTATUS_UPIE
| SSTATUS_SPP
| SSTATUS_FS
| SSTATUS_XS
|
236 SSTATUS_SUM
| SSTATUS_SD
;
237 static const target_ulong sstatus_v1_10_mask
= SSTATUS_SIE
| SSTATUS_SPIE
|
238 SSTATUS_UIE
| SSTATUS_UPIE
| SSTATUS_SPP
| SSTATUS_FS
| SSTATUS_XS
|
239 SSTATUS_SUM
| SSTATUS_MXR
| SSTATUS_SD
;
241 #if defined(TARGET_RISCV32)
242 static const char valid_vm_1_09
[16] = {
246 static const char valid_vm_1_10
[16] = {
250 #elif defined(TARGET_RISCV64)
251 static const char valid_vm_1_09
[16] = {
256 static const char valid_vm_1_10
[16] = {
262 #endif /* CONFIG_USER_ONLY */
264 /* Machine Information Registers */
265 static int read_zero(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
270 static int read_mhartid(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
276 /* Machine Trap Setup */
277 static int read_mstatus(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
283 static int validate_vm(CPURISCVState
*env
, target_ulong vm
)
285 return (env
->priv_ver
>= PRIV_VERSION_1_10_0
) ?
286 valid_vm_1_10
[vm
& 0xf] : valid_vm_1_09
[vm
& 0xf];
289 static int write_mstatus(CPURISCVState
*env
, int csrno
, target_ulong val
)
291 target_ulong mstatus
= env
->mstatus
;
292 target_ulong mask
= 0;
293 target_ulong mpp
= get_field(val
, MSTATUS_MPP
);
295 /* flush tlb on mstatus fields that affect VM */
296 if (env
->priv_ver
<= PRIV_VERSION_1_09_1
) {
297 if ((val
^ mstatus
) & (MSTATUS_MXR
| MSTATUS_MPP
|
298 MSTATUS_MPRV
| MSTATUS_SUM
| MSTATUS_VM
)) {
299 tlb_flush(CPU(riscv_env_get_cpu(env
)));
301 mask
= MSTATUS_SIE
| MSTATUS_SPIE
| MSTATUS_MIE
| MSTATUS_MPIE
|
302 MSTATUS_SPP
| MSTATUS_FS
| MSTATUS_MPRV
| MSTATUS_SUM
|
303 MSTATUS_MPP
| MSTATUS_MXR
|
304 (validate_vm(env
, get_field(val
, MSTATUS_VM
)) ?
307 if (env
->priv_ver
>= PRIV_VERSION_1_10_0
) {
308 if ((val
^ mstatus
) & (MSTATUS_MXR
| MSTATUS_MPP
|
309 MSTATUS_MPRV
| MSTATUS_SUM
)) {
310 tlb_flush(CPU(riscv_env_get_cpu(env
)));
312 mask
= MSTATUS_SIE
| MSTATUS_SPIE
| MSTATUS_MIE
| MSTATUS_MPIE
|
313 MSTATUS_SPP
| MSTATUS_FS
| MSTATUS_MPRV
| MSTATUS_SUM
|
314 MSTATUS_MPP
| MSTATUS_MXR
| MSTATUS_TVM
| MSTATUS_TSR
|
318 /* silenty discard mstatus.mpp writes for unsupported modes */
320 (!riscv_has_ext(env
, RVS
) && mpp
== PRV_S
) ||
321 (!riscv_has_ext(env
, RVU
) && mpp
== PRV_U
)) {
322 mask
&= ~MSTATUS_MPP
;
325 mstatus
= (mstatus
& ~mask
) | (val
& mask
);
327 int dirty
= ((mstatus
& MSTATUS_FS
) == MSTATUS_FS
) |
328 ((mstatus
& MSTATUS_XS
) == MSTATUS_XS
);
329 mstatus
= set_field(mstatus
, MSTATUS_SD
, dirty
);
330 env
->mstatus
= mstatus
;
335 static int read_misa(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
341 static int write_misa(CPURISCVState
*env
, int csrno
, target_ulong val
)
343 if (!riscv_feature(env
, RISCV_FEATURE_MISA
)) {
344 /* drop write to misa */
348 /* 'I' or 'E' must be present */
349 if (!(val
& (RVI
| RVE
))) {
350 /* It is not, drop write to misa */
354 /* 'E' excludes all other extensions */
356 /* when we support 'E' we can do "val = RVE;" however
357 * for now we just drop writes if 'E' is present.
362 /* Mask extensions that are not supported by this hart */
363 val
&= env
->misa_mask
;
365 /* Mask extensions that are not supported by QEMU */
366 val
&= (RVI
| RVE
| RVM
| RVA
| RVF
| RVD
| RVC
| RVS
| RVU
);
368 /* 'D' depends on 'F', so clear 'D' if 'F' is not present */
369 if ((val
& RVD
) && !(val
& RVF
)) {
373 /* Suppress 'C' if next instruction is not aligned
374 * TODO: this should check next_pc
376 if ((val
& RVC
) && (GETPC() & ~3) != 0) {
380 /* misa.MXL writes are not supported by QEMU */
381 val
= (env
->misa
& MISA_MXL
) | (val
& ~MISA_MXL
);
383 /* flush translation cache */
384 if (val
!= env
->misa
) {
385 tb_flush(CPU(riscv_env_get_cpu(env
)));
393 static int read_medeleg(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
399 static int write_medeleg(CPURISCVState
*env
, int csrno
, target_ulong val
)
401 env
->medeleg
= (env
->medeleg
& ~delegable_excps
) | (val
& delegable_excps
);
405 static int read_mideleg(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
411 static int write_mideleg(CPURISCVState
*env
, int csrno
, target_ulong val
)
413 env
->mideleg
= (env
->mideleg
& ~delegable_ints
) | (val
& delegable_ints
);
417 static int read_mie(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
423 static int write_mie(CPURISCVState
*env
, int csrno
, target_ulong val
)
425 env
->mie
= (env
->mie
& ~all_ints
) | (val
& all_ints
);
429 static int read_mtvec(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
435 static int write_mtvec(CPURISCVState
*env
, int csrno
, target_ulong val
)
437 /* bits [1:0] encode mode; 0 = direct, 1 = vectored, 2 >= reserved */
438 if ((val
& 3) == 0) {
439 env
->mtvec
= val
>> 2 << 2;
441 qemu_log_mask(LOG_UNIMP
, "CSR_MTVEC: vectored traps not supported");
446 static int read_mcounteren(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
448 if (env
->priv_ver
< PRIV_VERSION_1_10_0
) {
451 *val
= env
->mcounteren
;
455 static int write_mcounteren(CPURISCVState
*env
, int csrno
, target_ulong val
)
457 if (env
->priv_ver
< PRIV_VERSION_1_10_0
) {
460 env
->mcounteren
= val
;
464 static int read_mscounteren(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
466 if (env
->priv_ver
> PRIV_VERSION_1_09_1
) {
469 *val
= env
->mcounteren
;
473 static int write_mscounteren(CPURISCVState
*env
, int csrno
, target_ulong val
)
475 if (env
->priv_ver
> PRIV_VERSION_1_09_1
) {
478 env
->mcounteren
= val
;
482 static int read_mucounteren(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
484 if (env
->priv_ver
> PRIV_VERSION_1_09_1
) {
487 *val
= env
->scounteren
;
491 static int write_mucounteren(CPURISCVState
*env
, int csrno
, target_ulong val
)
493 if (env
->priv_ver
> PRIV_VERSION_1_09_1
) {
496 env
->scounteren
= val
;
500 /* Machine Trap Handling */
501 static int read_mscratch(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
503 *val
= env
->mscratch
;
507 static int write_mscratch(CPURISCVState
*env
, int csrno
, target_ulong val
)
513 static int read_mepc(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
519 static int write_mepc(CPURISCVState
*env
, int csrno
, target_ulong val
)
525 static int read_mcause(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
531 static int write_mcause(CPURISCVState
*env
, int csrno
, target_ulong val
)
537 static int read_mbadaddr(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
539 *val
= env
->mbadaddr
;
543 static int write_mbadaddr(CPURISCVState
*env
, int csrno
, target_ulong val
)
549 static int rmw_mip(CPURISCVState
*env
, int csrno
, target_ulong
*ret_value
,
550 target_ulong new_value
, target_ulong write_mask
)
552 RISCVCPU
*cpu
= riscv_env_get_cpu(env
);
553 target_ulong mask
= write_mask
& delegable_ints
;
556 /* We can't allow the supervisor to control SEIP as this would allow the
557 * supervisor to clear a pending external interrupt which will result in
558 * lost a interrupt in the case a PLIC is attached. The SEIP bit must be
559 * hardware controlled when a PLIC is attached. This should be an option
560 * for CPUs with software-delegated Supervisor External Interrupts. */
564 qemu_mutex_lock_iothread();
565 old_mip
= riscv_cpu_update_mip(cpu
, mask
, (new_value
& mask
));
566 qemu_mutex_unlock_iothread();
568 old_mip
= atomic_read(&env
->mip
);
572 *ret_value
= old_mip
;
578 /* Supervisor Trap Setup */
579 static int read_sstatus(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
581 target_ulong mask
= ((env
->priv_ver
>= PRIV_VERSION_1_10_0
) ?
582 sstatus_v1_10_mask
: sstatus_v1_9_mask
);
583 *val
= env
->mstatus
& mask
;
587 static int write_sstatus(CPURISCVState
*env
, int csrno
, target_ulong val
)
589 target_ulong mask
= ((env
->priv_ver
>= PRIV_VERSION_1_10_0
) ?
590 sstatus_v1_10_mask
: sstatus_v1_9_mask
);
591 target_ulong newval
= (env
->mstatus
& ~mask
) | (val
& mask
);
592 return write_mstatus(env
, CSR_MSTATUS
, newval
);
595 static int read_sie(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
597 *val
= env
->mie
& env
->mideleg
;
601 static int write_sie(CPURISCVState
*env
, int csrno
, target_ulong val
)
603 target_ulong newval
= (env
->mie
& ~env
->mideleg
) | (val
& env
->mideleg
);
604 return write_mie(env
, CSR_MIE
, newval
);
607 static int read_stvec(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
613 static int write_stvec(CPURISCVState
*env
, int csrno
, target_ulong val
)
615 /* bits [1:0] encode mode; 0 = direct, 1 = vectored, 2 >= reserved */
616 if ((val
& 3) == 0) {
617 env
->stvec
= val
>> 2 << 2;
619 qemu_log_mask(LOG_UNIMP
, "CSR_STVEC: vectored traps not supported");
624 static int read_scounteren(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
626 if (env
->priv_ver
< PRIV_VERSION_1_10_0
) {
629 *val
= env
->scounteren
;
633 static int write_scounteren(CPURISCVState
*env
, int csrno
, target_ulong val
)
635 if (env
->priv_ver
< PRIV_VERSION_1_10_0
) {
638 env
->scounteren
= val
;
642 /* Supervisor Trap Handling */
643 static int read_sscratch(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
645 *val
= env
->sscratch
;
649 static int write_sscratch(CPURISCVState
*env
, int csrno
, target_ulong val
)
655 static int read_sepc(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
661 static int write_sepc(CPURISCVState
*env
, int csrno
, target_ulong val
)
667 static int read_scause(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
673 static int write_scause(CPURISCVState
*env
, int csrno
, target_ulong val
)
679 static int read_sbadaddr(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
681 *val
= env
->sbadaddr
;
685 static int write_sbadaddr(CPURISCVState
*env
, int csrno
, target_ulong val
)
691 static int rmw_sip(CPURISCVState
*env
, int csrno
, target_ulong
*ret_value
,
692 target_ulong new_value
, target_ulong write_mask
)
694 return rmw_mip(env
, CSR_MSTATUS
, ret_value
, new_value
,
695 write_mask
& env
->mideleg
);
698 /* Supervisor Protection and Translation */
699 static int read_satp(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
701 if (!riscv_feature(env
, RISCV_FEATURE_MMU
)) {
703 } else if (env
->priv_ver
>= PRIV_VERSION_1_10_0
) {
704 if (env
->priv
== PRV_S
&& get_field(env
->mstatus
, MSTATUS_TVM
)) {
715 static int write_satp(CPURISCVState
*env
, int csrno
, target_ulong val
)
717 if (!riscv_feature(env
, RISCV_FEATURE_MMU
)) {
720 if (env
->priv_ver
<= PRIV_VERSION_1_09_1
&& (val
^ env
->sptbr
)) {
721 tlb_flush(CPU(riscv_env_get_cpu(env
)));
722 env
->sptbr
= val
& (((target_ulong
)
723 1 << (TARGET_PHYS_ADDR_SPACE_BITS
- PGSHIFT
)) - 1);
725 if (env
->priv_ver
>= PRIV_VERSION_1_10_0
&&
726 validate_vm(env
, get_field(val
, SATP_MODE
)) &&
727 ((val
^ env
->satp
) & (SATP_MODE
| SATP_ASID
| SATP_PPN
)))
729 if (env
->priv
== PRV_S
&& get_field(env
->mstatus
, MSTATUS_TVM
)) {
732 tlb_flush(CPU(riscv_env_get_cpu(env
)));
739 /* Physical Memory Protection */
740 static int read_pmpcfg(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
742 *val
= pmpcfg_csr_read(env
, csrno
- CSR_PMPCFG0
);
746 static int write_pmpcfg(CPURISCVState
*env
, int csrno
, target_ulong val
)
748 pmpcfg_csr_write(env
, csrno
- CSR_PMPCFG0
, val
);
752 static int read_pmpaddr(CPURISCVState
*env
, int csrno
, target_ulong
*val
)
754 *val
= pmpaddr_csr_read(env
, csrno
- CSR_PMPADDR0
);
758 static int write_pmpaddr(CPURISCVState
*env
, int csrno
, target_ulong val
)
760 pmpaddr_csr_write(env
, csrno
- CSR_PMPADDR0
, val
);
767 * riscv_csrrw - read and/or update control and status register
769 * csrr <-> riscv_csrrw(env, csrno, ret_value, 0, 0);
770 * csrrw <-> riscv_csrrw(env, csrno, ret_value, value, -1);
771 * csrrs <-> riscv_csrrw(env, csrno, ret_value, -1, value);
772 * csrrc <-> riscv_csrrw(env, csrno, ret_value, 0, value);
775 int riscv_csrrw(CPURISCVState
*env
, int csrno
, target_ulong
*ret_value
,
776 target_ulong new_value
, target_ulong write_mask
)
779 target_ulong old_value
;
781 /* check privileges and return -1 if check fails */
782 #if !defined(CONFIG_USER_ONLY)
783 int csr_priv
= get_field(csrno
, 0x300);
784 int read_only
= get_field(csrno
, 0xC00) == 3;
785 if ((write_mask
&& read_only
) || (env
->priv
< csr_priv
)) {
790 /* check predicate */
791 if (!csr_ops
[csrno
].predicate
|| csr_ops
[csrno
].predicate(env
, csrno
) < 0) {
795 /* execute combined read/write operation if it exists */
796 if (csr_ops
[csrno
].op
) {
797 return csr_ops
[csrno
].op(env
, csrno
, ret_value
, new_value
, write_mask
);
800 /* if no accessor exists then return failure */
801 if (!csr_ops
[csrno
].read
) {
806 ret
= csr_ops
[csrno
].read(env
, csrno
, &old_value
);
811 /* write value if writable and write mask set, otherwise drop writes */
813 new_value
= (old_value
& ~write_mask
) | (new_value
& write_mask
);
814 if (csr_ops
[csrno
].write
) {
815 ret
= csr_ops
[csrno
].write(env
, csrno
, new_value
);
822 /* return old value */
824 *ret_value
= old_value
;
830 /* Control and Status Register function table */
831 static riscv_csr_operations csr_ops
[CSR_TABLE_SIZE
] = {
832 /* User Floating-Point CSRs */
833 [CSR_FFLAGS
] = { fs
, read_fflags
, write_fflags
},
834 [CSR_FRM
] = { fs
, read_frm
, write_frm
},
835 [CSR_FCSR
] = { fs
, read_fcsr
, write_fcsr
},
837 /* User Timers and Counters */
838 [CSR_CYCLE
] = { ctr
, read_instret
},
839 [CSR_INSTRET
] = { ctr
, read_instret
},
840 #if defined(TARGET_RISCV32)
841 [CSR_CYCLEH
] = { ctr
, read_instreth
},
842 [CSR_INSTRETH
] = { ctr
, read_instreth
},
845 /* User-level time CSRs are only available in linux-user
846 * In privileged mode, the monitor emulates these CSRs */
847 #if defined(CONFIG_USER_ONLY)
848 [CSR_TIME
] = { ctr
, read_time
},
849 #if defined(TARGET_RISCV32)
850 [CSR_TIMEH
] = { ctr
, read_timeh
},
854 #if !defined(CONFIG_USER_ONLY)
855 /* Machine Timers and Counters */
856 [CSR_MCYCLE
] = { any
, read_instret
},
857 [CSR_MINSTRET
] = { any
, read_instret
},
858 #if defined(TARGET_RISCV32)
859 [CSR_MCYCLEH
] = { any
, read_instreth
},
860 [CSR_MINSTRETH
] = { any
, read_instreth
},
863 /* Machine Information Registers */
864 [CSR_MVENDORID
] = { any
, read_zero
},
865 [CSR_MARCHID
] = { any
, read_zero
},
866 [CSR_MIMPID
] = { any
, read_zero
},
867 [CSR_MHARTID
] = { any
, read_mhartid
},
869 /* Machine Trap Setup */
870 [CSR_MSTATUS
] = { any
, read_mstatus
, write_mstatus
},
871 [CSR_MISA
] = { any
, read_misa
, write_misa
},
872 [CSR_MIDELEG
] = { any
, read_mideleg
, write_mideleg
},
873 [CSR_MEDELEG
] = { any
, read_medeleg
, write_medeleg
},
874 [CSR_MIE
] = { any
, read_mie
, write_mie
},
875 [CSR_MTVEC
] = { any
, read_mtvec
, write_mtvec
},
876 [CSR_MCOUNTEREN
] = { any
, read_mcounteren
, write_mcounteren
},
878 /* Legacy Counter Setup (priv v1.9.1) */
879 [CSR_MUCOUNTEREN
] = { any
, read_mucounteren
, write_mucounteren
},
880 [CSR_MSCOUNTEREN
] = { any
, read_mscounteren
, write_mscounteren
},
882 /* Machine Trap Handling */
883 [CSR_MSCRATCH
] = { any
, read_mscratch
, write_mscratch
},
884 [CSR_MEPC
] = { any
, read_mepc
, write_mepc
},
885 [CSR_MCAUSE
] = { any
, read_mcause
, write_mcause
},
886 [CSR_MBADADDR
] = { any
, read_mbadaddr
, write_mbadaddr
},
887 [CSR_MIP
] = { any
, NULL
, NULL
, rmw_mip
},
889 /* Supervisor Trap Setup */
890 [CSR_SSTATUS
] = { smode
, read_sstatus
, write_sstatus
},
891 [CSR_SIE
] = { smode
, read_sie
, write_sie
},
892 [CSR_STVEC
] = { smode
, read_stvec
, write_stvec
},
893 [CSR_SCOUNTEREN
] = { smode
, read_scounteren
, write_scounteren
},
895 /* Supervisor Trap Handling */
896 [CSR_SSCRATCH
] = { smode
, read_sscratch
, write_sscratch
},
897 [CSR_SEPC
] = { smode
, read_sepc
, write_sepc
},
898 [CSR_SCAUSE
] = { smode
, read_scause
, write_scause
},
899 [CSR_SBADADDR
] = { smode
, read_sbadaddr
, write_sbadaddr
},
900 [CSR_SIP
] = { smode
, NULL
, NULL
, rmw_sip
},
902 /* Supervisor Protection and Translation */
903 [CSR_SATP
] = { smode
, read_satp
, write_satp
},
905 /* Physical Memory Protection */
906 [CSR_PMPCFG0
... CSR_PMPADDR9
] = { pmp
, read_pmpcfg
, write_pmpcfg
},
907 [CSR_PMPADDR0
... CSR_PMPADDR15
] = { pmp
, read_pmpaddr
, write_pmpaddr
},
909 /* Performance Counters */
910 [CSR_HPMCOUNTER3
... CSR_HPMCOUNTER31
] = { ctr
, read_zero
},
911 [CSR_MHPMCOUNTER3
... CSR_MHPMCOUNTER31
] = { any
, read_zero
},
912 [CSR_MHPMEVENT3
... CSR_MHPMEVENT31
] = { any
, read_zero
},
913 #if defined(TARGET_RISCV32)
914 [CSR_HPMCOUNTER3H
... CSR_HPMCOUNTER31H
] = { ctr
, read_zero
},
915 [CSR_MHPMCOUNTER3H
... CSR_MHPMCOUNTER31H
] = { any
, read_zero
},
917 #endif /* !CONFIG_USER_ONLY */