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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.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <1598924352-89526-16-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Bin Meng 2020-09-01 09:39:10 +08:00 • committed by Alistair Francis
parent ce908a2f6f
commit a47ef6e93a
10 changed files with 40 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

6
target/riscv/cpu.h
View file

@ -219,7 +219,8 @@ 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;
@ -350,7 +351,8 @@ 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
target/riscv/cpu_helper.c
View file

@ -276,9 +276,11 @@ 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
target/riscv/csr.c
View file

@ -351,7 +351,7 @@ 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;
}
@ -364,7 +364,7 @@ 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