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efi_loader: new function efi_memcpy_runtime()

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Provide a memcpy() function that we can use at UEFI runtime.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-06-28 16:30:29 +02:00
parent 724d28171e
commit b0dd8cb407
2 changed files with 22 additions and 0 deletions
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3
include/efi_loader.h
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@ -792,6 +792,9 @@ bool efi_secure_boot_enabled(void);
bool efi_image_parse(void *efi, size_t len, struct efi_image_regions **regp, bool efi_image_parse(void *efi, size_t len, struct efi_image_regions **regp,
WIN_CERTIFICATE **auth, size_t *auth_len); WIN_CERTIFICATE **auth, size_t *auth_len);
/* runtime implementation of memcpy() */
void efi_memcpy_runtime(void *dest, const void *src, size_t n);
#else /* CONFIG_IS_ENABLED(EFI_LOADER) */ #else /* CONFIG_IS_ENABLED(EFI_LOADER) */
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */ /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */

19
lib/efi_loader/efi_runtime.c
View file

@ -137,6 +137,25 @@ efi_status_t efi_init_runtime_supported(void)
return ret; return ret;
} }
/**
* efi_memcpy_runtime() - copy memory area
*
* At runtime memcpy() is not available.
*
* @dest: destination buffer
* @src: source buffer
* @n: number of bytes to copy
* Return: pointer to destination buffer
*/
void __efi_runtime efi_memcpy_runtime(void *dest, const void *src, size_t n)
{
u8 *d = dest;
const u8 *s = src;
for (; n; --n)
*d++ = *s++;
}
/** /**
* efi_update_table_header_crc32() - Update crc32 in table header * efi_update_table_header_crc32() - Update crc32 in table header
* *