Re: [Qemu-devel] [PATCH v8 01/35] RISC-V: Replace hardcoded constants with enum values

[Alistair Francis]

On Wed, Apr 25, 2018 at 4:47 PM Michael Clark <address@hidden> wrote:

> The RISC-V device-tree code has a number of hard-coded
> constants and this change moves them into header enums.

> Cc: Sagar Karandikar <address@hidden>
> Cc: Bastian Koppelmann <address@hidden>
> Signed-off-by: Michael Clark <address@hidden>
> Signed-off-by: Palmer Dabbelt <address@hidden>
> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

Reviewed-by: Alistair Francis <address@hidden>

Alistair

> ---
>   hw/riscv/sifive_clint.c         | 9 +++------
>   hw/riscv/sifive_u.c             | 6 ++++--
>   hw/riscv/spike.c                | 6 ++++--
>   hw/riscv/virt.c                 | 6 ++++--
>   include/hw/riscv/sifive_clint.h | 4 ++++
>   include/hw/riscv/sifive_u.h     | 4 ++++
>   include/hw/riscv/spike.h        | 4 ++++
>   include/hw/riscv/virt.h         | 4 ++++
>   8 files changed, 31 insertions(+), 12 deletions(-)

> diff --git a/hw/riscv/sifive_clint.c b/hw/riscv/sifive_clint.c
> index 4893453..7cc606e 100644
> --- a/hw/riscv/sifive_clint.c
> +++ b/hw/riscv/sifive_clint.c
> @@ -26,13 +26,10 @@
>   #include "hw/riscv/sifive_clint.h"
>   #include "qemu/timer.h"

> -/* See: riscv-pk/machine/sbi_entry.S and arch/riscv/kernel/time.c */
> -#define TIMER_FREQ (10 * 1000 * 1000)
> -
>   static uint64_t cpu_riscv_read_rtc(void)
>   {
> -    return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), TIMER_FREQ,
> -                    NANOSECONDS_PER_SECOND);
> +    return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
> +        SIFIVE_CLINT_TIMEBASE_FREQ, NANOSECONDS_PER_SECOND);
>   }

>   /*
> @@ -59,7 +56,7 @@ static void sifive_clint_write_timecmp(RISCVCPU *cpu,
uint64_t value)
>       diff = cpu->env.timecmp - rtc_r;
>       /* back to ns (note args switched in muldiv64) */
>       next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
> -        muldiv64(diff, NANOSECONDS_PER_SECOND, TIMER_FREQ);
> +        muldiv64(diff, NANOSECONDS_PER_SECOND,
SIFIVE_CLINT_TIMEBASE_FREQ);
>       timer_mod(cpu->env.timer, next);
>   }

> diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
> index 1c2deef..f3f7615 100644
> --- a/hw/riscv/sifive_u.c
> +++ b/hw/riscv/sifive_u.c
> @@ -122,7 +122,8 @@ static void create_fdt(SiFiveUState *s, const struct
MemmapEntry *memmap,
>       g_free(nodename);

>       qemu_fdt_add_subnode(fdt, "/cpus");
> -    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency", 10000000);
> +    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency",
> +        SIFIVE_CLINT_TIMEBASE_FREQ);
>       qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
>       qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);

> @@ -131,7 +132,8 @@ static void create_fdt(SiFiveUState *s, const struct
MemmapEntry *memmap,
>           char *intc = 
> g_strdup_printf("/cpus/address@hidden/interrupt-controller",
cpu);
>           char *isa = riscv_isa_string(&s->soc.harts[cpu]);
>           qemu_fdt_add_subnode(fdt, nodename);
> -        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
1000000000);
> +        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
> +                              SIFIVE_U_CLOCK_FREQ);
>           qemu_fdt_setprop_string(fdt, nodename, "mmu-type", "riscv,sv48");
>           qemu_fdt_setprop_string(fdt, nodename, "riscv,isa", isa);
>           qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv");
> diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
> index 2d1f114..4c233ec 100644
> --- a/hw/riscv/spike.c
> +++ b/hw/riscv/spike.c
> @@ -115,7 +115,8 @@ static void create_fdt(SpikeState *s, const struct
MemmapEntry *memmap,
>       g_free(nodename);

>       qemu_fdt_add_subnode(fdt, "/cpus");
> -    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency", 10000000);
> +    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency",
> +        SIFIVE_CLINT_TIMEBASE_FREQ);
>       qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
>       qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);

> @@ -124,7 +125,8 @@ static void create_fdt(SpikeState *s, const struct
MemmapEntry *memmap,
>           char *intc = 
> g_strdup_printf("/cpus/address@hidden/interrupt-controller",
cpu);
>           char *isa = riscv_isa_string(&s->soc.harts[cpu]);
>           qemu_fdt_add_subnode(fdt, nodename);
> -        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
1000000000);
> +        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
> +                              SPIKE_CLOCK_FREQ);
>           qemu_fdt_setprop_string(fdt, nodename, "mmu-type", "riscv,sv48");
>           qemu_fdt_setprop_string(fdt, nodename, "riscv,isa", isa);
>           qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv");
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index e2c214e..86a86c9 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -145,7 +145,8 @@ static void *create_fdt(RISCVVirtState *s, const
struct MemmapEntry *memmap,
>       g_free(nodename);

>       qemu_fdt_add_subnode(fdt, "/cpus");
> -    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency", 10000000);
> +    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency",
> +                          SIFIVE_CLINT_TIMEBASE_FREQ);
>       qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
>       qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);

> @@ -155,7 +156,8 @@ static void *create_fdt(RISCVVirtState *s, const
struct MemmapEntry *memmap,
>           char *intc = 
> g_strdup_printf("/cpus/address@hidden/interrupt-controller",
cpu);
>           char *isa = riscv_isa_string(&s->soc.harts[cpu]);
>           qemu_fdt_add_subnode(fdt, nodename);
> -        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
1000000000);
> +        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
> +                              VIRT_CLOCK_FREQ);
>           qemu_fdt_setprop_string(fdt, nodename, "mmu-type", "riscv,sv48");
>           qemu_fdt_setprop_string(fdt, nodename, "riscv,isa", isa);
>           qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv");
> diff --git a/include/hw/riscv/sifive_clint.h
b/include/hw/riscv/sifive_clint.h
> index aaa2a58..e2865be 100644
> --- a/include/hw/riscv/sifive_clint.h
> +++ b/include/hw/riscv/sifive_clint.h
> @@ -47,4 +47,8 @@ enum {
>       SIFIVE_TIME_BASE    = 0xBFF8
>   };

> +enum {
> +    SIFIVE_CLINT_TIMEBASE_FREQ = 10000000
> +};
> +
>   #endif
> diff --git a/include/hw/riscv/sifive_u.h b/include/hw/riscv/sifive_u.h
> index 662e8a1..be38aa0 100644
> --- a/include/hw/riscv/sifive_u.h
> +++ b/include/hw/riscv/sifive_u.h
> @@ -50,6 +50,10 @@ enum {
>       SIFIVE_U_UART1_IRQ = 4
>   };

> +enum {
> +    SIFIVE_U_CLOCK_FREQ = 1000000000
> +};
> +
>   #define SIFIVE_U_PLIC_HART_CONFIG "MS"
>   #define SIFIVE_U_PLIC_NUM_SOURCES 127
>   #define SIFIVE_U_PLIC_NUM_PRIORITIES 7
> diff --git a/include/hw/riscv/spike.h b/include/hw/riscv/spike.h
> index cb55a14..d85a64e 100644
> --- a/include/hw/riscv/spike.h
> +++ b/include/hw/riscv/spike.h
> @@ -42,6 +42,10 @@ enum {
>       SPIKE_DRAM
>   };

> +enum {
> +    SPIKE_CLOCK_FREQ = 1000000000
> +};
> +
>   #if defined(TARGET_RISCV32)
>   #define SPIKE_V1_09_1_CPU TYPE_RISCV_CPU_RV32GCSU_V1_09_1
>   #define SPIKE_V1_10_0_CPU TYPE_RISCV_CPU_RV32GCSU_V1_10_0
> diff --git a/include/hw/riscv/virt.h b/include/hw/riscv/virt.h
> index 7525647..2fbe808 100644
> --- a/include/hw/riscv/virt.h
> +++ b/include/hw/riscv/virt.h
> @@ -55,6 +55,10 @@ enum {
>       VIRTIO_NDEV = 10
>   };

> +enum {
> +    VIRT_CLOCK_FREQ = 1000000000
> +};
> +
>   #define VIRT_PLIC_HART_CONFIG "MS"
>   #define VIRT_PLIC_NUM_SOURCES 127
>   #define VIRT_PLIC_NUM_PRIORITIES 7
> --
> 2.7.0