[Xen-devel] [PATCH v3 42/62] arm/acpi: Prepare FADT table for Dom0
Stefano Stabellini
stefano.stabellini at eu.citrix.com
Thu Nov 26 09:19:07 PST 2015
On Tue, 17 Nov 2015, shannon.zhao at linaro.org wrote:
> From: Shannon Zhao <shannon.zhao at linaro.org>
>
> Copy and modify FADT table before passing it to Dom0. Set PSCI_COMPLIANT
> and PSCI_USE_HVC.
>
> Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
>
> xen/arch/arm/domain_build.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 45 insertions(+)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index b5ed44c..5d03dc0 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1357,6 +1357,46 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
> }
>
> #ifdef CONFIG_ACPI
> +#define XEN_HYPERVISOR_ID 0x000058656E564D4D /* "XenVMM" */
This needs to be documented somewhere. A new doc under docs/ might be
enough.
> +static int acpi_create_fadt(struct domain *d, struct membank tbl_add[])
> +{
> + struct acpi_table_header *table = NULL;
> + struct acpi_table_fadt *fadt = NULL;
> + u64 table_size;
> + acpi_status status;
> + u8 *base_ptr;
> + u8 checksum;
> +
> + status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
> +
> + if ( ACPI_FAILURE(status) )
> + {
> + const char *msg = acpi_format_exception(status);
> +
> + printk("Failed to get FADT table, %s\n", msg);
> + return -EINVAL;
> + }
> +
> + table_size = table->length;
> + base_ptr = d->arch.efi_acpi_table
> + + acpi_get_table_offset(tbl_add, TBL_FADT);
> + ACPI_MEMCPY(base_ptr, table, table_size);
> + fadt = (struct acpi_table_fadt *)base_ptr;
> +
> + /* Set PSCI_COMPLIANT and PSCI_USE_HVC */
> + fadt->arm_boot_flags |= (ACPI_FADT_PSCI_COMPLIANT | ACPI_FADT_PSCI_USE_HVC);
> + fadt->hypervisor_id = XEN_HYPERVISOR_ID;
> + checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, fadt), table_size);
> + fadt->header.checksum -= checksum;
> +
> + tbl_add[TBL_FADT].start = d->arch.efi_acpi_gpa
> + + acpi_get_table_offset(tbl_add, TBL_FADT);
> + tbl_add[TBL_FADT].size = table_size;
> +
> + return 0;
> +}
> +
> static int estimate_acpi_efi_size(struct domain *d, struct kernel_info *kinfo)
> {
> u64 efi_size, acpi_size = 0, addr;
> @@ -1400,6 +1440,7 @@ static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
> {
> int rc = 0;
> int order;
> + struct membank tbl_add[TBL_MMAX] = {};
>
> rc = estimate_acpi_efi_size(d, kinfo);
> if ( rc != 0 )
> @@ -1418,6 +1459,10 @@ static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
> * region. So we use it as the ACPI table mapped address. */
> d->arch.efi_acpi_gpa = kinfo->gnttab_start;
>
> + rc = acpi_create_fadt(d, tbl_add);
> + if ( rc != 0 )
> + return rc;
> +
> return 0;
> }
> #else
> --
> 2.1.0
>
>
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