Add efi_memset_runtime() for EFI runtime paths This keeps buffer initialization in runtime-resident code after ExitBootServices() and avoids relying on non-runtime helpers.
Reviewed-by: Ilias Apalodimas <[email protected]> Signed-off-by: Harsimran Singh Tungal <[email protected]> --- Changelog: =============== v2: Simon: - Fix the `efi_memset_runtime()` comment and kernel-doc style - Drop `__efi_runtime` from the header prototype - Align the definition signature with nearby helpers - Cast the stored byte to `u8` include/efi_loader.h | 3 +++ lib/efi_loader/efi_runtime.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/efi_loader.h b/include/efi_loader.h index 3a4d502631c..9dfea1fd7de 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -1151,6 +1151,9 @@ void efi_memcpy_runtime(void *dest, const void *src, size_t n); /* runtime implementation of memcmp() */ int efi_memcmp_runtime(const void *s1, const void *s2, size_t n); +/* runtime implementation of memset() */ +void *efi_memset_runtime(void *dest, int c, size_t n); + /* commonly used helper functions */ u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name, unsigned int index); diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c index 73d4097464c..c0182931c42 100644 --- a/lib/efi_loader/efi_runtime.c +++ b/lib/efi_loader/efi_runtime.c @@ -233,6 +233,26 @@ int __efi_runtime efi_memcmp_runtime(const void *s1, const void *s2, size_t n) return 0; } +/** + * efi_memset_runtime() - fill memory area + * + * At runtime memset() is not available. + * + * @dest: destination buffer + * @c: byte value used to fill destination buffer + * @n: number of bytes to set + * Return: pointer to destination buffer + */ +__efi_runtime void *efi_memset_runtime(void *dest, int c, size_t n) +{ + u8 *d = dest; + + for (; n; --n) + *d++ = (u8)c; + + return dest; +} + /** * efi_update_table_header_crc32() - Update crc32 in table header * -- 2.34.1
