On Thu, Mar 12, 2020 at 09:13:24AM +0800, Qiuxu Zhuo wrote:
> The 'nr_config_table' and 'config_table' (already in efi structure)
> in efi structure provide a way for some driver(e.g. capsule-pstore
> goes through the configuration table to extract crash capsules to
> aid in debugging) to iterate over the EFI configuration table array.
>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@xxxxxxxxx>
> ---
> arch/x86/platform/efi/efi.c | 1 +
> drivers/firmware/efi/arm-init.c | 4 +++-
> drivers/firmware/efi/efi.c | 1 +
> include/linux/efi.h | 1 +
> 4 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index ae923ee8e2b4..2f3065905e8a 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -456,6 +456,7 @@ void __init efi_init(void)
> return;
>
> efi.config_table = (unsigned long)efi.systab->tables;
> + efi.nr_config_table = (unsigned long)efi.systab->nr_tables;
> efi.fw_vendor = (unsigned long)efi.systab->fw_vendor;
> efi.runtime = (unsigned long)efi.systab->runtime;
>
> diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
> index d99f5b0c8a09..f2e2e1c1624b 100644
> --- a/drivers/firmware/efi/arm-init.c
> +++ b/drivers/firmware/efi/arm-init.c
> @@ -143,8 +143,10 @@ static int __init uefi_init(void)
> sizeof(efi_config_table_t),
> arch_tables);
>
> - if (!retval)
> + if (!retval) {
> efi.config_table = (unsigned long)efi.systab->tables;
> + efi.nr_config_table = (unsigned long)efi.systab->nr_tables;
> + }
>
> early_memunmap(config_tables, table_size);
> out:
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 621220ab3d0e..1b599941bad3 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -46,6 +46,7 @@ struct efi __read_mostly efi = {
> .fw_vendor = EFI_INVALID_TABLE_ADDR,
> .runtime = EFI_INVALID_TABLE_ADDR,
> .config_table = EFI_INVALID_TABLE_ADDR,
> + .nr_config_table = 0,
> .esrt = EFI_INVALID_TABLE_ADDR,
> .properties_table = EFI_INVALID_TABLE_ADDR,
> .mem_attr_table = EFI_INVALID_TABLE_ADDR,
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 7efd7072cca5..13b3fe069f1f 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -913,6 +913,7 @@ extern struct efi {
> unsigned long fw_vendor; /* fw_vendor */
> unsigned long runtime; /* runtime table */
> unsigned long config_table; /* config tables */
> + unsigned long nr_config_table; /* the number of config tables */
nit: please use a tab character before the comment to get correct
alignemnt.
> unsigned long esrt; /* ESRT table */
> unsigned long properties_table; /* properties table */
> unsigned long mem_attr_table; /* memory attributes table */
> --
> 2.17.1
>
--
Kees Cook
