Previously, the number of PMP regions was hardcoded to 16 in QEMU.
This patch replaces the fixed value with a new `pmp_regions` field,
allowing platforms to configure the number of PMP regions.
If no specific value is provided, the default number of PMP regions
remains 16 to preserve the existing behavior.
A new CPU parameter num-pmp-regions has been introduced to the QEMU
command line. For example:
-cpu rv64, g=true, c=true, pmp=true, num-pmp-regions=8
Signed-off-by: Jay Chang <jay.ch...@sifive.com>
Reviewed-by: Frank Chang <frank.ch...@sifive.com>
---
target/riscv/cpu.c | 54 +++++++++++++++++++++++++++++--
target/riscv/cpu.h | 3 +-
target/riscv/cpu_cfg_fields.h.inc | 1 +
target/riscv/csr.c | 5 ++-
target/riscv/machine.c | 3 +-
target/riscv/pmp.c | 28 ++++++++++------
6 files changed, 80 insertions(+), 14 deletions(-)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 629ac37501..8e32252c11 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1117,6 +1117,7 @@ static void riscv_cpu_init(Object *obj)
cpu->cfg.cbom_blocksize = 64;
cpu->cfg.cbop_blocksize = 64;
cpu->cfg.cboz_blocksize = 64;
+ cpu->cfg.pmp_regions = 16;
cpu->env.vext_ver = VEXT_VERSION_1_00_0;
cpu->cfg.max_satp_mode = -1;
@@ -1568,6 +1569,46 @@ static const PropertyInfo prop_pmp = {
.set = prop_pmp_set,
};
+static void prop_num_pmp_regions_set(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ RISCVCPU *cpu = RISCV_CPU(obj);
+ uint8_t value;
+
+ visit_type_uint8(v, name, &value, errp);
+
+ if (cpu->cfg.pmp_regions != value && riscv_cpu_is_vendor(obj)) {
+ cpu_set_prop_err(cpu, name, errp);
+ return;
+ }
+
+ if (cpu->env.priv_ver < PRIV_VERSION_1_12_0 && value > OLD_MAX_RISCV_PMPS)
{
+ error_setg(errp, "Number of PMP regions exceeds maximum available");
+ return;
+ } else if (value > MAX_RISCV_PMPS) {
+ error_setg(errp, "Number of PMP regions exceeds maximum available");
+ return;
+ }
+
+ cpu_option_add_user_setting(name, value);
+ cpu->cfg.pmp_regions = value;
+}
+
+static void prop_num_pmp_regions_get(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ uint8_t value = RISCV_CPU(obj)->cfg.pmp_regions;
+
+ visit_type_uint8(v, name, &value, errp);
+}
+
+static const PropertyInfo prop_num_pmp_regions = {
+ .type = "uint8",
+ .description = "num-pmp-regions",
+ .get = prop_num_pmp_regions_get,
+ .set = prop_num_pmp_regions_set,
+};
+
static int priv_spec_from_str(const char *priv_spec_str)
{
int priv_version = -1;
@@ -2567,6 +2608,7 @@ static const Property riscv_cpu_properties[] = {
{.name = "mmu", .info = &prop_mmu},
{.name = "pmp", .info = &prop_pmp},
+ {.name = "num-pmp-regions", .info = &prop_num_pmp_regions},
{.name = "priv_spec", .info = &prop_priv_spec},
{.name = "vext_spec", .info = &prop_vext_spec},
@@ -2891,6 +2933,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
DEFINE_ABSTRACT_RISCV_CPU(TYPE_RISCV_DYNAMIC_CPU, TYPE_RISCV_CPU,
.cfg.mmu = true,
.cfg.pmp = true,
+ .cfg.pmp_regions = 8,
.priv_spec = PRIV_VERSION_LATEST,
),
@@ -2937,7 +2980,8 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.max_satp_mode = VM_1_10_MBARE,
.cfg.ext_zifencei = true,
.cfg.ext_zicsr = true,
- .cfg.pmp = true
+ .cfg.pmp = true,
+ .cfg.pmp_regions = 8
),
DEFINE_ABSTRACT_RISCV_CPU(TYPE_RISCV_CPU_SIFIVE_U, TYPE_RISCV_VENDOR_CPU,
@@ -2948,7 +2992,8 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.ext_zifencei = true,
.cfg.ext_zicsr = true,
.cfg.mmu = true,
- .cfg.pmp = true
+ .cfg.pmp = true,
+ .cfg.pmp_regions = 8
),
#if defined(TARGET_RISCV32) || \
@@ -2966,6 +3011,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.ext_zifencei = true,
.cfg.ext_zicsr = true,
.cfg.pmp = true,
+ .cfg.pmp_regions = 8,
.cfg.ext_smepmp = true,
.cfg.ext_zba = true,
@@ -3040,6 +3086,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.ext_xtheadmempair = true,
.cfg.ext_xtheadsync = true,
.cfg.pmp = true,
+ .cfg.pmp_regions = 8,
.cfg.mvendorid = THEAD_VENDOR_ID,
@@ -3063,6 +3110,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.rvv_ta_all_1s = true,
.cfg.misa_w = true,
.cfg.pmp = true,
+ .cfg.pmp_regions = 8,
.cfg.cbom_blocksize = 64,
.cfg.cbop_blocksize = 64,
.cfg.cboz_blocksize = 64,
@@ -3119,6 +3167,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.ext_zifencei = true,
.cfg.ext_zicsr = true,
.cfg.pmp = true,
+ .cfg.pmp_regions = 8,
.cfg.ext_zicbom = true,
.cfg.cbom_blocksize = 64,
.cfg.cboz_blocksize = 64,
@@ -3163,6 +3212,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
.cfg.mmu = true,
.cfg.pmp = true,
+ .cfg.pmp_regions = 8,
.cfg.max_satp_mode = VM_1_10_SV39,
),
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 229ade9ed9..67323a7d9d 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -159,7 +159,8 @@ extern RISCVCPUImpliedExtsRule
*riscv_multi_ext_implied_rules[];
#define MMU_USER_IDX 3
-#define MAX_RISCV_PMPS (16)
+#define MAX_RISCV_PMPS (64)
+#define OLD_MAX_RISCV_PMPS (16)
#if !defined(CONFIG_USER_ONLY)
#include "pmp.h"
diff --git a/target/riscv/cpu_cfg_fields.h.inc
b/target/riscv/cpu_cfg_fields.h.inc
index 59f134a419..33c4f9bac8 100644
--- a/target/riscv/cpu_cfg_fields.h.inc
+++ b/target/riscv/cpu_cfg_fields.h.inc
@@ -163,6 +163,7 @@ TYPED_FIELD(uint16_t, elen, 0)
TYPED_FIELD(uint16_t, cbom_blocksize, 0)
TYPED_FIELD(uint16_t, cbop_blocksize, 0)
TYPED_FIELD(uint16_t, cboz_blocksize, 0)
+TYPED_FIELD(uint8_t, pmp_regions, 0)
TYPED_FIELD(int8_t, max_satp_mode, -1)
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index d6cd441133..44fb664636 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -738,7 +738,10 @@ static RISCVException dbltrp_hmode(CPURISCVState *env, int
csrno)
static RISCVException pmp(CPURISCVState *env, int csrno)
{
if (riscv_cpu_cfg(env)->pmp) {
- if (csrno <= CSR_PMPCFG3) {
+ uint8_t max_pmpcfg = (env->priv_ver >= PRIV_VERSION_1_12_0) ?
++ CSR_PMPCFG15 : CSR_PMPCFG3;
+
+ if (csrno <= max_pmpcfg) {
uint32_t reg_index = csrno - CSR_PMPCFG0;
/* TODO: RV128 restriction check */
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index c97e9ce9df..1600ec44f0 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -36,8 +36,9 @@ static int pmp_post_load(void *opaque, int version_id)
RISCVCPU *cpu = opaque;
CPURISCVState *env = &cpu->env;
int i;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
- for (i = 0; i < MAX_RISCV_PMPS; i++) {
+ for (i = 0; i < pmp_regions; i++) {
pmp_update_rule_addr(env, i);
}
pmp_update_rule_nums(env);
diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c
index 5af295e410..3540327c9a 100644
--- a/target/riscv/pmp.c
+++ b/target/riscv/pmp.c
@@ -122,7 +122,9 @@ uint32_t pmp_get_num_rules(CPURISCVState *env)
*/
static inline uint8_t pmp_read_cfg(CPURISCVState *env, uint32_t pmp_index)
{
- if (pmp_index < MAX_RISCV_PMPS) {
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
+
+ if (pmp_index < pmp_regions) {
return env->pmp_state.pmp[pmp_index].cfg_reg;
}
@@ -136,7 +138,9 @@ static inline uint8_t pmp_read_cfg(CPURISCVState *env,
uint32_t pmp_index)
*/
static bool pmp_write_cfg(CPURISCVState *env, uint32_t pmp_index, uint8_t val)
{
- if (pmp_index < MAX_RISCV_PMPS) {
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
+
+ if (pmp_index < pmp_regions) {
if (env->pmp_state.pmp[pmp_index].cfg_reg == val) {
/* no change */
return false;
@@ -236,9 +240,10 @@ void pmp_update_rule_addr(CPURISCVState *env, uint32_t
pmp_index)
void pmp_update_rule_nums(CPURISCVState *env)
{
int i;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
env->pmp_state.num_rules = 0;
- for (i = 0; i < MAX_RISCV_PMPS; i++) {
+ for (i = 0; i < pmp_regions; i++) {
const uint8_t a_field =
pmp_get_a_field(env->pmp_state.pmp[i].cfg_reg);
if (PMP_AMATCH_OFF != a_field) {
@@ -332,6 +337,7 @@ bool pmp_hart_has_privs(CPURISCVState *env, hwaddr addr,
int pmp_size = 0;
hwaddr s = 0;
hwaddr e = 0;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
/* Short cut if no rules */
if (0 == pmp_get_num_rules(env)) {
@@ -356,7 +362,7 @@ bool pmp_hart_has_privs(CPURISCVState *env, hwaddr addr,
* 1.10 draft priv spec states there is an implicit order
* from low to high
*/
- for (i = 0; i < MAX_RISCV_PMPS; i++) {
+ for (i = 0; i < pmp_regions; i++) {
s = pmp_is_in_range(env, i, addr);
e = pmp_is_in_range(env, i, addr + pmp_size - 1);
@@ -527,8 +533,9 @@ void pmpaddr_csr_write(CPURISCVState *env, uint32_t
addr_index,
{
trace_pmpaddr_csr_write(env->mhartid, addr_index, val);
bool is_next_cfg_tor = false;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
- if (addr_index < MAX_RISCV_PMPS) {
+ if (addr_index < pmp_regions) {
if (env->pmp_state.pmp[addr_index].addr_reg == val) {
/* no change */
return;
@@ -538,7 +545,7 @@ void pmpaddr_csr_write(CPURISCVState *env, uint32_t
addr_index,
* In TOR mode, need to check the lock bit of the next pmp
* (if there is a next).
*/
- if (addr_index + 1 < MAX_RISCV_PMPS) {
+ if (addr_index + 1 < pmp_regions) {
uint8_t pmp_cfg = env->pmp_state.pmp[addr_index + 1].cfg_reg;
is_next_cfg_tor = PMP_AMATCH_TOR == pmp_get_a_field(pmp_cfg);
@@ -573,8 +580,9 @@ void pmpaddr_csr_write(CPURISCVState *env, uint32_t
addr_index,
target_ulong pmpaddr_csr_read(CPURISCVState *env, uint32_t addr_index)
{
target_ulong val = 0;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
- if (addr_index < MAX_RISCV_PMPS) {
+ if (addr_index < pmp_regions) {
val = env->pmp_state.pmp[addr_index].addr_reg;
trace_pmpaddr_csr_read(env->mhartid, addr_index, val);
} else {
@@ -592,6 +600,7 @@ void mseccfg_csr_write(CPURISCVState *env, target_ulong val)
{
int i;
uint64_t mask = MSECCFG_MMWP | MSECCFG_MML;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
/* Update PMM field only if the value is valid according to Zjpm v1.0 */
if (riscv_cpu_cfg(env)->ext_smmpm &&
riscv_cpu_mxl(env) == MXL_RV64 &&
@@ -603,7 +612,7 @@ void mseccfg_csr_write(CPURISCVState *env, target_ulong val)
/* RLB cannot be enabled if it's already 0 and if any regions are locked */
if (!MSECCFG_RLB_ISSET(env)) {
- for (i = 0; i < MAX_RISCV_PMPS; i++) {
+ for (i = 0; i < pmp_regions; i++) {
if (pmp_is_locked(env, i)) {
val &= ~MSECCFG_RLB;
break;
@@ -659,6 +668,7 @@ target_ulong pmp_get_tlb_size(CPURISCVState *env, hwaddr
addr)
hwaddr tlb_sa = addr & ~(TARGET_PAGE_SIZE - 1);
hwaddr tlb_ea = tlb_sa + TARGET_PAGE_SIZE - 1;
int i;
+ uint8_t pmp_regions = riscv_cpu_cfg(env)->pmp_regions;
/*
* If PMP is not supported or there are no PMP rules, the TLB page will not
@@ -669,7 +679,7 @@ target_ulong pmp_get_tlb_size(CPURISCVState *env, hwaddr
addr)
return TARGET_PAGE_SIZE;
}
- for (i = 0; i < MAX_RISCV_PMPS; i++) {
+ for (i = 0; i < pmp_regions; i++) {
if (pmp_get_a_field(env->pmp_state.pmp[i].cfg_reg) == PMP_AMATCH_OFF) {
continue;
}
--
2.48.1
