Hi Bin and Alistair,
>> +#if defined(CONFIG_RISCV_CUSTOM)
>> +static void setup_custom_csr(CPURISCVState *env,
>> + riscv_custom_csr_operations csr_map_struct[]
>> + ) {
>{ should be put to the next line, per QEMU coding convention. Please
>fix this globally in this series.
Will do
>> +
>> + env->custom_csr_map = g_hash_table_new_full(g_direct_hash, \
>> + g_direct_equal, \
>> + NULL, NULL);
> Is it possible to juse use g_hash_table_new() directly, with both 2
> parameters being NULL, given you don't provide the destroy hooks?
> like:
>
> env->custom_csr_map = g_hash_table_new(NULL, NULL);
I can try.
>> +
>> +
>> + int i;
>nits: please move this to the beginning of this function.
Will do.
>> + for (i = 0; i < MAX_CUSTOM_CSR_NUM; i++) {
>> + if (csr_map_struct[i].csrno != 0) {
>> + g_hash_table_insert(env->custom_csr_map,
>> + GINT_TO_POINTER(csr_map_struct[i].csrno),
>> + &csr_map_struct[i].csr_opset);
>> + } else {
>> + break;
>break? I think we should continue the loop.
Please refer to Patch 4.
The table is null-ended.
Thus it's a break here.
>> +typedef struct {
>> + int csrno;
>> + riscv_csr_operations csr_opset;
>> + } riscv_custom_csr_operations;
> } should be put in the beginning without space. Please fix this
> globally in this series.
Will do.
> +
> +/*
> + * The reason why we have an abstraction here is that : We could have CSR
> + * number M on hart A is an alias of CSR number N on hart B. So we make a
> + * CSR number to value address map.
> + */
> +typedef struct {
> + int csrno;
> + target_ulong val;
> + } riscv_custom_csr_vals;
> +
It looks this struct is not used by any patch in this series?
>> /* CSR function table constants */
>> enum {
>> - CSR_TABLE_SIZE = 0x1000
>> + CSR_TABLE_SIZE = 0x1000,
>> + MAX_CUSTOM_CSR_NUM = 100
>To be consistent, name this to be: CUSTOM_CSR_TABLE_SIZE
Sounds reasonable.
>> /* CSR function table */
>> +extern int andes_custom_csr_size;
>> +extern riscv_custom_csr_operations
>> andes_custom_csr_table[MAX_CUSTOM_CSR_NUM];
>The above 2 should not be in this patch.
Could you elaborate a little bit more ?
>> 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);
>>
>> +
>This is unnecessary.
Sorry for the newline.
>> -#if !defined(CONFIG_USER_ONLY)
>> +#pragma GCC diagnostic push
>> +#pragma GCC diagnostic ignored "-Wunused-function"
>Use __attribute__((__unused__)), so we don't need to use GCC push/pop
Thanks for the tips.
Will do.
>> +/*
>> + * XXX: This is just a write stub for developing custom CSR handler,
>Remove XXX
Will do.
>> + * if the behavior of writting such CSR is not presentable in QEMU and
>> doesn't
>typo: writing.
>Is that present, or presentable?
It's not a writing typo. I mean "presentable" with its literal meaning.
If we cannot demonstrate a hardware feature inside QEMU, we can just stub it.
>> +#if defined(CONFIG_RISCV_CUSTOM)
>> +/* Custom CSR related routines and data structures */
>> +
>> +static gpointer is_custom_csr(CPURISCVState *env, int csrno)
>The function name suggests that the return value should be of bool
>type. Suggest we do:
>static bool is_custom_csr(CPURISCVState *env, int csrno,
>riscv_custom_csr_operations *custom_csr_ops)
Thanks for the advice, will modify it for V5.
>> +
>> +
>Unnecessary changes
Sorry for the newline.
>> int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value,
>> target_ulong new_value, target_ulong write_mask)
>> {
>> int ret;
>> target_ulong old_value;
>> RISCVCPU *cpu = env_archcpu(env);
>> + #if !defined(CONFIG_RISCV_CUSTOM)
>Please make sure #if starts from the beginning of this line, without space
>ahead
Will do.
>> + riscv_csr_operations *csrop = &csr_ops[csrno];
>nits: name this variable to csr_ops
It will collide with original csr_ops.
I'll change to another name.
>>
>> +#if defined(CONFIG_RISCV_CUSTOM)
>> +/* Include the custom CSR table here. */
>nits: remove the ending .
Will do.
Sorry for all these style format issues.
I must I cherry-picked a wrong before I ran checkpatch.pl.
>> +/* This file is intentionally left blank at this commit. */
>nits: remove the ending .
>%s/at/in
Will do.
>Regards,
>Bin
Thanks for the quick reply and advice.
I'll cook the v5 ASAP.
Best regards,
Ruinland
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