From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Date: Wed, 26 Jul 2017 13:41:04 +0200 Subject: [U-Boot] [PATCH 1/2] efi_loader: Improve install_configuration_table Message-ID: <20170726114105.51159-1-agraf@suse.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de The INSTALL_CONFIGURATION_TABLE callback also provides the ability to remove table entries. This patch adds that functionality. Signed-off-by: Alexander Graf --- lib/efi_loader/efi_boottime.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index 9a1a93fade..17c531a480 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -630,6 +630,17 @@ static efi_status_t EFIAPI efi_locate_device_path(efi_guid_t *protocol, return EFI_EXIT(EFI_NOT_FOUND); } +/* Collapses configuration table entries, removing index i */ +static void efi_remove_configuration_table(int i) +{ + struct efi_configuration_table *this = &efi_conf_table[i]; + struct efi_configuration_table *next = &efi_conf_table[i+1]; + struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables]; + + memmove(this, next, (ulong)end - (ulong)next); + systab.nr_tables--; +} + efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table) { int i; @@ -637,11 +648,17 @@ efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table /* Check for guid override */ for (i = 0; i < systab.nr_tables; i++) { if (!guidcmp(guid, &efi_conf_table[i].guid)) { - efi_conf_table[i].table = table; + if (table) + efi_conf_table[i].table = table; + else + efi_remove_configuration_table(i); return EFI_SUCCESS; } } + if (!table) + return EFI_NOT_FOUND; + /* No override, check for overflow */ if (i >= ARRAY_SIZE(efi_conf_table)) return EFI_OUT_OF_RESOURCES; -- 2.12.3