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SubjectRe: [PATCH v5 2/4] x86/boot: Add acpitb.c to parse acpi tables
Hi Chao,

On 08/07/18 at 02:49pm, Chao Fan wrote:

I think better add acpi/efi maintainers to CC when you post.


> +static acpi_physical_address get_rsdp_addr(void)
> +{
> + acpi_physical_address pa = 0;
> + bool status = false;


Here, I think you should make get_rsdp_addr() consistent with its
counterpart acpi_os_get_root_pointer(). In acpi_os_get_root_pointer(),
we take care of the case that acpi_rsdp passed in a value.
> +
> + status = efi_get_rsdp_addr(&pa);
> +
> + if (!status || pa == 0)
> + bios_get_rsdp_addr(&pa);
> +
> + return pa;
> +}
> +
> +struct acpi_table_header *get_acpi_srat_table(void)
> +{
> + char *args = (char *)get_cmd_line_ptr();
> + acpi_physical_address acpi_table;
> + acpi_physical_address root_table;
> + struct acpi_table_header *header;
> + struct acpi_table_rsdp *rsdp;
> + char *signature;
> + u8 *entry;
> + u32 count;
> + u32 size;
> + int i, j;
> + u32 len;
> +
> + rsdp = (struct acpi_table_rsdp *)get_rsdp_addr();
> + if (!rsdp)
> + return NULL;
> +
> + /* Get rsdt or xsdt from rsdp. */
> + if (!strstr(args, "acpi=rsdt") &&
> + rsdp->xsdt_physical_address && rsdp->revision > 1) {
> + root_table = rsdp->xsdt_physical_address;
> + size = ACPI_XSDT_ENTRY_SIZE;
> + } else {
> + root_table = rsdp->rsdt_physical_address;
> + size = ACPI_RSDT_ENTRY_SIZE;
> + }
> +
> + /* Get ACPI root table from rsdt or xsdt.*/
> + header = (struct acpi_table_header *)root_table;
> + len = header->length;
> + count = (u32)((len - sizeof(struct acpi_table_header)) / size);
> + entry = ACPI_ADD_PTR(u8, header, sizeof(struct acpi_table_header));
> +
> + for (i = 0; i < count; i++) {
> + u64 address64;
> +
> + if (size == ACPI_RSDT_ENTRY_SIZE)
> + acpi_table = ((acpi_physical_address)
> + (*ACPI_CAST_PTR(u32, entry)));
> + else {
> + *(u64 *)(void *)&address64 = *(u64 *)(void *)entry;
> + acpi_table = (acpi_physical_address) address64;
> + }
> +
> + if (acpi_table) {
> + header = (struct acpi_table_header *)acpi_table;
> + signature = header->signature;
> +
> + if (!strncmp(signature, "SRAT", 4))
> + return header;
> + }
> + entry += size;
> + }
> + return NULL;
> +}
> --
> 2.17.1
>
>
>

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