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qemu/target/riscv/cpu.h
Atish Patra 29a9ec9bd8 target/riscv: Add *envcfg* CSRs support 
The RISC-V privileged specification v1.12 defines few execution
environment configuration CSRs that can be used enable/disable
extensions per privilege levels.

Add the basic support for these CSRs.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Message-Id: <20220303185440.512391-6-atishp@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2022-04-22 10:35:16 +10:00

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/*
* QEMU RISC-V CPU
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
* Copyright (c) 2017-2018 SiFive, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef RISCV_CPU_H
#define RISCV_CPU_H
#include "hw/core/cpu.h"
#include "hw/registerfields.h"
#include "exec/cpu-defs.h"
#include "qemu/cpu-float.h"
#include "qom/object.h"
#include "qemu/int128.h"
#include "cpu_bits.h"
#define TCG_GUEST_DEFAULT_MO 0
#define TYPE_RISCV_CPU "riscv-cpu"
#define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU
#define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX)
#define CPU_RESOLVING_TYPE TYPE_RISCV_CPU
#define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any")
#define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32")
#define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64")
#define TYPE_RISCV_CPU_BASE128 RISCV_CPU_TYPE_NAME("x-rv128")
#define TYPE_RISCV_CPU_IBEX RISCV_CPU_TYPE_NAME("lowrisc-ibex")
#define TYPE_RISCV_CPU_SHAKTI_C RISCV_CPU_TYPE_NAME("shakti-c")
#define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31")
#define TYPE_RISCV_CPU_SIFIVE_E34 RISCV_CPU_TYPE_NAME("sifive-e34")
#define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51")
#define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34")
#define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54")
#define TYPE_RISCV_CPU_HOST RISCV_CPU_TYPE_NAME("host")
#if defined(TARGET_RISCV32)
# define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE32
#elif defined(TARGET_RISCV64)
# define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE64
#endif
#define RV(x) ((target_ulong)1 << (x - 'A'))
#define RVI RV('I')
#define RVE RV('E') /* E and I are mutually exclusive */
#define RVM RV('M')
#define RVA RV('A')
#define RVF RV('F')
#define RVD RV('D')
#define RVV RV('V')
#define RVC RV('C')
#define RVS RV('S')
#define RVU RV('U')
#define RVH RV('H')
#define RVJ RV('J')
/* S extension denotes that Supervisor mode exists, however it is possible
to have a core that support S mode but does not have an MMU and there
is currently no bit in misa to indicate whether an MMU exists or not
so a cpu features bitfield is required, likewise for optional PMP support */
enum {
RISCV_FEATURE_MMU,
RISCV_FEATURE_PMP,
RISCV_FEATURE_EPMP,
RISCV_FEATURE_MISA,
RISCV_FEATURE_AIA
};
/* Privileged specification version */
enum {
PRIV_VERSION_1_10_0 = 0,
PRIV_VERSION_1_11_0,
PRIV_VERSION_1_12_0,
};
#define VEXT_VERSION_1_00_0 0x00010000
enum {
TRANSLATE_SUCCESS,
TRANSLATE_FAIL,
TRANSLATE_PMP_FAIL,
TRANSLATE_G_STAGE_FAIL
};
#define MMU_USER_IDX 3
#define MAX_RISCV_PMPS (16)
typedef struct CPUArchState CPURISCVState;
#if !defined(CONFIG_USER_ONLY)
#include "pmp.h"
#endif
#define RV_VLEN_MAX 1024
FIELD(VTYPE, VLMUL, 0, 3)
FIELD(VTYPE, VSEW, 3, 3)
FIELD(VTYPE, VTA, 6, 1)
FIELD(VTYPE, VMA, 7, 1)
FIELD(VTYPE, VEDIV, 8, 2)
FIELD(VTYPE, RESERVED, 10, sizeof(target_ulong) * 8 - 11)
struct CPUArchState {
target_ulong gpr[32];
target_ulong gprh[32]; /* 64 top bits of the 128-bit registers */
uint64_t fpr[32]; /* assume both F and D extensions */
/* vector coprocessor state. */
uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16);
target_ulong vxrm;
target_ulong vxsat;
target_ulong vl;
target_ulong vstart;
target_ulong vtype;
bool vill;
target_ulong pc;
target_ulong load_res;
target_ulong load_val;
target_ulong frm;
target_ulong badaddr;
uint32_t bins;
target_ulong guest_phys_fault_addr;
target_ulong priv_ver;
target_ulong bext_ver;
target_ulong vext_ver;
/* RISCVMXL, but uint32_t for vmstate migration */
uint32_t misa_mxl; /* current mxl */
uint32_t misa_mxl_max; /* max mxl for this cpu */
uint32_t misa_ext; /* current extensions */
uint32_t misa_ext_mask; /* max ext for this cpu */
uint32_t xl; /* current xlen */
/* 128-bit helpers upper part return value */
target_ulong retxh;
uint32_t features;
#ifdef CONFIG_USER_ONLY
uint32_t elf_flags;
#endif
#ifndef CONFIG_USER_ONLY
target_ulong priv;
/* This contains QEMU specific information about the virt state. */
target_ulong virt;
target_ulong geilen;
target_ulong resetvec;
target_ulong mhartid;
/*
* For RV32 this is 32-bit mstatus and 32-bit mstatush.
* For RV64 this is a 64-bit mstatus.
*/
uint64_t mstatus;
uint64_t mip;
uint64_t miclaim;
uint64_t mie;
uint64_t mideleg;
target_ulong satp; /* since: priv-1.10.0 */
target_ulong stval;
target_ulong medeleg;
target_ulong stvec;
target_ulong sepc;
target_ulong scause;
target_ulong mtvec;
target_ulong mepc;
target_ulong mcause;
target_ulong mtval; /* since: priv-1.10.0 */
/* Machine and Supervisor interrupt priorities */
uint8_t miprio[64];
uint8_t siprio[64];
/* AIA CSRs */
target_ulong miselect;
target_ulong siselect;
/* Hypervisor CSRs */
target_ulong hstatus;
target_ulong hedeleg;
uint64_t hideleg;
target_ulong hcounteren;
target_ulong htval;
target_ulong htinst;
target_ulong hgatp;
target_ulong hgeie;
target_ulong hgeip;
uint64_t htimedelta;
/* Hypervisor controlled virtual interrupt priorities */
target_ulong hvictl;
uint8_t hviprio[64];
/* Upper 64-bits of 128-bit CSRs */
uint64_t mscratchh;
uint64_t sscratchh;
/* Virtual CSRs */
/*
* For RV32 this is 32-bit vsstatus and 32-bit vsstatush.
* For RV64 this is a 64-bit vsstatus.
*/
uint64_t vsstatus;
target_ulong vstvec;
target_ulong vsscratch;
target_ulong vsepc;
target_ulong vscause;
target_ulong vstval;
target_ulong vsatp;
/* AIA VS-mode CSRs */
target_ulong vsiselect;
target_ulong mtval2;
target_ulong mtinst;
/* HS Backup CSRs */
target_ulong stvec_hs;
target_ulong sscratch_hs;
target_ulong sepc_hs;
target_ulong scause_hs;
target_ulong stval_hs;
target_ulong satp_hs;
uint64_t mstatus_hs;
/* Signals whether the current exception occurred with two-stage address
translation active. */
bool two_stage_lookup;
target_ulong scounteren;
target_ulong mcounteren;
target_ulong sscratch;
target_ulong mscratch;
/* temporary htif regs */
uint64_t mfromhost;
uint64_t mtohost;
uint64_t timecmp;
/* physical memory protection */
pmp_table_t pmp_state;
target_ulong mseccfg;
/* machine specific rdtime callback */
uint64_t (*rdtime_fn)(uint32_t);
uint32_t rdtime_fn_arg;
/* machine specific AIA ireg read-modify-write callback */
#define AIA_MAKE_IREG(__isel, __priv, __virt, __vgein, __xlen) \
((((__xlen) & 0xff) << 24) | \
(((__vgein) & 0x3f) << 20) | \
(((__virt) & 0x1) << 18) | \
(((__priv) & 0x3) << 16) | \
(__isel & 0xffff))
#define AIA_IREG_ISEL(__ireg) ((__ireg) & 0xffff)
#define AIA_IREG_PRIV(__ireg) (((__ireg) >> 16) & 0x3)
#define AIA_IREG_VIRT(__ireg) (((__ireg) >> 18) & 0x1)
#define AIA_IREG_VGEIN(__ireg) (((__ireg) >> 20) & 0x3f)
#define AIA_IREG_XLEN(__ireg) (((__ireg) >> 24) & 0xff)
int (*aia_ireg_rmw_fn[4])(void *arg, target_ulong reg,
target_ulong *val, target_ulong new_val, target_ulong write_mask);
void *aia_ireg_rmw_fn_arg[4];
/* True if in debugger mode. */
bool debugger;
/*
* CSRs for PointerMasking extension
*/
target_ulong mmte;
target_ulong mpmmask;
target_ulong mpmbase;
target_ulong spmmask;
target_ulong spmbase;
target_ulong upmmask;
target_ulong upmbase;
/* CSRs for execution enviornment configuration */
uint64_t menvcfg;
target_ulong senvcfg;
uint64_t henvcfg;
#endif
target_ulong cur_pmmask;
target_ulong cur_pmbase;
float_status fp_status;
/* Fields from here on are preserved across CPU reset. */
QEMUTimer *timer; /* Internal timer */
hwaddr kernel_addr;
hwaddr fdt_addr;
/* kvm timer */
bool kvm_timer_dirty;
uint64_t kvm_timer_time;
uint64_t kvm_timer_compare;
uint64_t kvm_timer_state;
uint64_t kvm_timer_frequency;
};
OBJECT_DECLARE_CPU_TYPE(RISCVCPU, RISCVCPUClass, RISCV_CPU)
/**
* RISCVCPUClass:
* @parent_realize: The parent class' realize handler.
* @parent_reset: The parent class' reset handler.
*
* A RISCV CPU model.
*/
struct RISCVCPUClass {
/*< private >*/
CPUClass parent_class;
/*< public >*/
DeviceRealize parent_realize;
DeviceReset parent_reset;
};
struct RISCVCPUConfig {
bool ext_i;
bool ext_e;
bool ext_g;
bool ext_m;
bool ext_a;
bool ext_f;
bool ext_d;
bool ext_c;
bool ext_s;
bool ext_u;
bool ext_h;
bool ext_j;
bool ext_v;
bool ext_zba;
bool ext_zbb;
bool ext_zbc;
bool ext_zbs;
bool ext_counters;
bool ext_ifencei;
bool ext_icsr;
bool ext_svinval;
bool ext_svnapot;
bool ext_svpbmt;
bool ext_zdinx;
bool ext_zfh;
bool ext_zfhmin;
bool ext_zfinx;
bool ext_zhinx;
bool ext_zhinxmin;
bool ext_zve32f;
bool ext_zve64f;
/* Vendor-specific custom extensions */
bool ext_XVentanaCondOps;
char *priv_spec;
char *user_spec;
char *bext_spec;
char *vext_spec;
uint16_t vlen;
uint16_t elen;
bool mmu;
bool pmp;
bool epmp;
bool aia;
uint64_t resetvec;
};
typedef struct RISCVCPUConfig RISCVCPUConfig;
/**
* RISCVCPU:
* @env: #CPURISCVState
*
* A RISCV CPU.
*/
struct ArchCPU {
/*< private >*/
CPUState parent_obj;
/*< public >*/
CPUNegativeOffsetState neg;
CPURISCVState env;
char *dyn_csr_xml;
char *dyn_vreg_xml;
/* Configuration Settings */
RISCVCPUConfig cfg;
};
static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext)
{
return (env->misa_ext & ext) != 0;
}
static inline bool riscv_feature(CPURISCVState *env, int feature)
{
return env->features & (1ULL << feature);
}
static inline void riscv_set_feature(CPURISCVState *env, int feature)
{
env->features |= (1ULL << feature);
}
#include "cpu_user.h"
extern const char * const riscv_int_regnames[];
extern const char * const riscv_int_regnamesh[];
extern const char * const riscv_fpr_regnames[];
const char *riscv_cpu_get_trap_name(target_ulong cause, bool async);
void riscv_cpu_do_interrupt(CPUState *cpu);
int riscv_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
int cpuid, void *opaque);
int riscv_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
int cpuid, void *opaque);
int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
int riscv_cpu_hviprio_index2irq(int index, int *out_irq, int *out_rdzero);
uint8_t riscv_cpu_default_priority(int irq);
int riscv_cpu_mirq_pending(CPURISCVState *env);
int riscv_cpu_sirq_pending(CPURISCVState *env);
int riscv_cpu_vsirq_pending(CPURISCVState *env);
bool riscv_cpu_fp_enabled(CPURISCVState *env);
target_ulong riscv_cpu_get_geilen(CPURISCVState *env);
void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen);
bool riscv_cpu_vector_enabled(CPURISCVState *env);
bool riscv_cpu_virt_enabled(CPURISCVState *env);
void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable);
bool riscv_cpu_two_stage_lookup(int mmu_idx);
int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
G_NORETURN void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
MMUAccessType access_type, int mmu_idx,
uintptr_t retaddr);
bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
MMUAccessType access_type, int mmu_idx,
bool probe, uintptr_t retaddr);
void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
vaddr addr, unsigned size,
MMUAccessType access_type,
int mmu_idx, MemTxAttrs attrs,
MemTxResult response, uintptr_t retaddr);
char *riscv_isa_string(RISCVCPU *cpu);
void riscv_cpu_list(void);
#define cpu_list riscv_cpu_list
#define cpu_mmu_index riscv_cpu_mmu_index
#ifndef CONFIG_USER_ONLY
bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request);
void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env);
int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint64_t interrupts);
uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t mask, uint64_t value);
#define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */
void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t),
uint32_t arg);
void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, uint32_t priv,
int (*rmw_fn)(void *arg,
target_ulong reg,
target_ulong *val,
target_ulong new_val,
target_ulong write_mask),
void *rmw_fn_arg);
#endif
void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);
void riscv_translate_init(void);
G_NORETURN void riscv_raise_exception(CPURISCVState *env,
uint32_t exception, uintptr_t pc);
target_ulong riscv_cpu_get_fflags(CPURISCVState *env);
void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);
#define TB_FLAGS_PRIV_MMU_MASK 3
#define TB_FLAGS_PRIV_HYP_ACCESS_MASK (1 << 2)
#define TB_FLAGS_MSTATUS_FS MSTATUS_FS
#define TB_FLAGS_MSTATUS_VS MSTATUS_VS
#include "exec/cpu-all.h"
FIELD(TB_FLAGS, MEM_IDX, 0, 3)
FIELD(TB_FLAGS, LMUL, 3, 3)
FIELD(TB_FLAGS, SEW, 6, 3)
/* Skip MSTATUS_VS (0x600) bits */
FIELD(TB_FLAGS, VL_EQ_VLMAX, 11, 1)
FIELD(TB_FLAGS, VILL, 12, 1)
/* Skip MSTATUS_FS (0x6000) bits */
/* Is a Hypervisor instruction load/store allowed? */
FIELD(TB_FLAGS, HLSX, 15, 1)
FIELD(TB_FLAGS, MSTATUS_HS_FS, 16, 2)
FIELD(TB_FLAGS, MSTATUS_HS_VS, 18, 2)
/* The combination of MXL/SXL/UXL that applies to the current cpu mode. */
FIELD(TB_FLAGS, XL, 20, 2)
/* If PointerMasking should be applied */
FIELD(TB_FLAGS, PM_MASK_ENABLED, 22, 1)
FIELD(TB_FLAGS, PM_BASE_ENABLED, 23, 1)
#ifdef TARGET_RISCV32
#define riscv_cpu_mxl(env) ((void)(env), MXL_RV32)
#else
static inline RISCVMXL riscv_cpu_mxl(CPURISCVState *env)
{
return env->misa_mxl;
}
#endif
#define riscv_cpu_mxl_bits(env) (1UL << (4 + riscv_cpu_mxl(env)))
#if defined(TARGET_RISCV32)
#define cpu_recompute_xl(env) ((void)(env), MXL_RV32)
#else
static inline RISCVMXL cpu_recompute_xl(CPURISCVState *env)
{
RISCVMXL xl = env->misa_mxl;
#if !defined(CONFIG_USER_ONLY)
/*
* When emulating a 32-bit-only cpu, use RV32.
* When emulating a 64-bit cpu, and MXL has been reduced to RV32,
* MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened
* back to RV64 for lower privs.
*/
if (xl != MXL_RV32) {
switch (env->priv) {
case PRV_M:
break;
case PRV_U:
xl = get_field(env->mstatus, MSTATUS64_UXL);
break;
default: /* PRV_S | PRV_H */
xl = get_field(env->mstatus, MSTATUS64_SXL);
break;
}
}
#endif
return xl;
}
#endif
static inline int riscv_cpu_xlen(CPURISCVState *env)
{
return 16 << env->xl;
}
#ifdef TARGET_RISCV32
#define riscv_cpu_sxl(env) ((void)(env), MXL_RV32)
#else
static inline RISCVMXL riscv_cpu_sxl(CPURISCVState *env)
{
#ifdef CONFIG_USER_ONLY
return env->misa_mxl;
#else
return get_field(env->mstatus, MSTATUS64_SXL);
#endif
}
#endif
/*
* Encode LMUL to lmul as follows:
* LMUL vlmul lmul
* 1 000 0
* 2 001 1
* 4 010 2
* 8 011 3
* - 100 -
* 1/8 101 -3
* 1/4 110 -2
* 1/2 111 -1
*
* then, we can calculate VLMAX = vlen >> (vsew + 3 - lmul)
* e.g. vlen = 256 bits, SEW = 16, LMUL = 1/8
* => VLMAX = vlen >> (1 + 3 - (-3))
* = 256 >> 7
* = 2
*/
static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype)
{
uint8_t sew = FIELD_EX64(vtype, VTYPE, VSEW);
int8_t lmul = sextract32(FIELD_EX64(vtype, VTYPE, VLMUL), 0, 3);
return cpu->cfg.vlen >> (sew + 3 - lmul);
}
void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
target_ulong *cs_base, uint32_t *pflags);
void riscv_cpu_update_mask(CPURISCVState *env);
RISCVException riscv_csrrw(CPURISCVState *env, int csrno,
target_ulong *ret_value,
target_ulong new_value, target_ulong write_mask);
RISCVException riscv_csrrw_debug(CPURISCVState *env, int csrno,
target_ulong *ret_value,
target_ulong new_value,
target_ulong write_mask);
static inline void riscv_csr_write(CPURISCVState *env, int csrno,
target_ulong val)
{
riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS));
}
static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno)
{
target_ulong val = 0;
riscv_csrrw(env, csrno, &val, 0, 0);
return val;
}
typedef RISCVException (*riscv_csr_predicate_fn)(CPURISCVState *env,
int csrno);
typedef RISCVException (*riscv_csr_read_fn)(CPURISCVState *env, int csrno,
target_ulong *ret_value);
typedef RISCVException (*riscv_csr_write_fn)(CPURISCVState *env, int csrno,
target_ulong new_value);
typedef RISCVException (*riscv_csr_op_fn)(CPURISCVState *env, int csrno,
target_ulong *ret_value,
target_ulong new_value,
target_ulong write_mask);
RISCVException riscv_csrrw_i128(CPURISCVState *env, int csrno,
Int128 *ret_value,
Int128 new_value, Int128 write_mask);
typedef RISCVException (*riscv_csr_read128_fn)(CPURISCVState *env, int csrno,
Int128 *ret_value);
typedef RISCVException (*riscv_csr_write128_fn)(CPURISCVState *env, int csrno,
Int128 new_value);
typedef struct {
const char *name;
riscv_csr_predicate_fn predicate;
riscv_csr_read_fn read;
riscv_csr_write_fn write;
riscv_csr_op_fn op;
riscv_csr_read128_fn read128;
riscv_csr_write128_fn write128;
/* The default priv spec version should be PRIV_VERSION_1_10_0 (i.e 0) */
uint32_t min_priv_ver;
} riscv_csr_operations;
/* CSR function table constants */
enum {
CSR_TABLE_SIZE = 0x1000
};
/* CSR function table */
extern riscv_csr_operations csr_ops[CSR_TABLE_SIZE];
void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops);
void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);
void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);
#endif /* RISCV_CPU_H */
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