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hw/riscv: clint: Avoid using hard-coded timebase frequency

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At present the CLINT timestamp is using a hard-coded timebase
frequency value SIFIVE_CLINT_TIMEBASE_FREQ. This might not be
true for all boards.

Add a new 'timebase-freq' property to the CLINT device, and
update various functions to accept this as a parameter.

Backports a47ef6e93ab2ca1db8d5ecb61fda3c41f926a26b
This commit is contained in:
Bin Meng 2021-03-08 14:01:56 -05:00 committed by Lioncash
parent d508a74a74
commit 1341de97f0
3 changed files with 9 additions and 5 deletions
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6
qemu/target/riscv/cpu.h
View file

@ -233,7 +233,8 @@ struct CPURISCVState {
pmp_table_t pmp_state;
/* machine specific rdtime callback */
uint64_t (*rdtime_fn)(void);
uint64_t (*rdtime_fn)(uint32_t);
uint32_t rdtime_fn_arg;
/* True if in debugger mode. */
bool debugger;
@ -349,7 +350,8 @@ void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env);
int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts);
uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_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)(void));
void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t),
uint32_t arg);
#endif
void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);

4
qemu/target/riscv/cpu_helper.c
View file

@ -270,9 +270,11 @@ uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value)
return old;
}
void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void))
void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t),
uint32_t arg)
{
env->rdtime_fn = fn;
env->rdtime_fn_arg = arg;
}
void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv)

4
qemu/target/riscv/csr.c
View file

@ -296,7 +296,7 @@ static int read_time(CPURISCVState *env, int csrno, target_ulong *val)
return -RISCV_EXCP_ILLEGAL_INST;
}
*val = env->rdtime_fn() + delta;
*val = env->rdtime_fn(env->rdtime_fn_arg) + delta;
return 0;
}
@ -309,7 +309,7 @@ static int read_timeh(CPURISCVState *env, int csrno, target_ulong *val)
return -RISCV_EXCP_ILLEGAL_INST;
}
*val = (env->rdtime_fn() + delta) >> 32;
*val = (env->rdtime_fn(env->rdtime_fn_arg) + delta) >> 32;
return 0;
}
#endif