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boot: Add efivar_get/set_uint64_le() functions

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These are implemented as bit-shifting functions that allow reading
and writing UEFI variables stored as little endian 64-bit unsigned
values.
This commit is contained in:
Daan De Meyer
2021-02-02 21:03:58 +00:00
parent a7308a266b
commit 987d0a1250
2 changed files with 65 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/boot/efi/util.c
+61
View File
@@ -97,6 +97,32 @@ EFI_STATUS efivar_set_uint_string(const EFI_GUID *vendor, CHAR16 *name, UINTN i,
return efivar_set(vendor, name, str, persistent);
}
EFI_STATUS efivar_set_uint32_le(const EFI_GUID *vendor, CHAR16 *name, UINT32 value, BOOLEAN persistent) {
UINT8 buf[4];
buf[0] = (UINT8)(value >> 0U & 0xFF);
buf[1] = (UINT8)(value >> 8U & 0xFF);
buf[2] = (UINT8)(value >> 16U & 0xFF);
buf[3] = (UINT8)(value >> 24U & 0xFF);
return efivar_set_raw(vendor, name, buf, sizeof(buf), persistent);
}
EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, CHAR16 *name, UINT64 value, BOOLEAN persistent) {
UINT8 buf[8];
buf[0] = (UINT8)(value >> 0U & 0xFF);
buf[1] = (UINT8)(value >> 8U & 0xFF);
buf[2] = (UINT8)(value >> 16U & 0xFF);
buf[3] = (UINT8)(value >> 24U & 0xFF);
buf[4] = (UINT8)(value >> 32U & 0xFF);
buf[5] = (UINT8)(value >> 40U & 0xFF);
buf[6] = (UINT8)(value >> 48U & 0xFF);
buf[7] = (UINT8)(value >> 56U & 0xFF);
return efivar_set_raw(vendor, name, buf, sizeof(buf), persistent);
}
EFI_STATUS efivar_get(const EFI_GUID *vendor, const CHAR16 *name, CHAR16 **value) {
_cleanup_freepool_ CHAR8 *buf = NULL;
EFI_STATUS err;
@@ -143,6 +169,41 @@ EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const CHAR16 *name, UI
return err;
}
EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const CHAR16 *name, UINT32 *ret) {
_cleanup_freepool_ CHAR8 *buf = NULL;
UINTN size;
EFI_STATUS err;
err = efivar_get_raw(vendor, name, &buf, &size);
if (!EFI_ERROR(err) && ret) {
if (size != sizeof(UINT32))
return EFI_BUFFER_TOO_SMALL;
*ret = (UINT32) buf[0] << 0U | (UINT32) buf[1] << 8U | (UINT32) buf[2] << 16U |
(UINT32) buf[3] << 24U;
}
return err;
}
EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const CHAR16 *name, UINT64 *ret) {
_cleanup_freepool_ CHAR8 *buf = NULL;
UINTN size;
EFI_STATUS err;
err = efivar_get_raw(vendor, name, &buf, &size);
if (!EFI_ERROR(err) && ret) {
if (size != sizeof(UINT64))
return EFI_BUFFER_TOO_SMALL;
*ret = (UINT64) buf[0] << 0U | (UINT64) buf[1] << 8U | (UINT64) buf[2] << 16U |
(UINT64) buf[3] << 24U | (UINT64) buf[4] << 32U | (UINT64) buf[5] << 40U |
(UINT64) buf[6] << 48U | (UINT64) buf[7] << 56U;
}
return err;
}
EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const CHAR16 *name, CHAR8 **buffer, UINTN *size) {
_cleanup_freepool_ CHAR8 *buf = NULL;
UINTN l;
src/boot/efi/util.h
+4
View File
@@ -24,11 +24,15 @@ UINT64 time_usec(void);
EFI_STATUS efivar_set(const EFI_GUID *vendor, const CHAR16 *name, const CHAR16 *value, BOOLEAN persistent);
EFI_STATUS efivar_set_raw(const EFI_GUID *vendor, const CHAR16 *name, const VOID *buf, UINTN size, BOOLEAN persistent);
EFI_STATUS efivar_set_uint_string(const EFI_GUID *vendor, CHAR16 *name, UINTN i, BOOLEAN persistent);
EFI_STATUS efivar_set_uint32_le(const EFI_GUID *vendor, CHAR16 *NAME, UINT32 value, BOOLEAN persistent);
EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, CHAR16 *name, UINT64 value, BOOLEAN persistent);
VOID efivar_set_time_usec(const EFI_GUID *vendor, CHAR16 *name, UINT64 usec);
EFI_STATUS efivar_get(const EFI_GUID *vendor, const CHAR16 *name, CHAR16 **value);
EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const CHAR16 *name, CHAR8 **buffer, UINTN *size);
EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const CHAR16 *name, UINTN *i);
EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const CHAR16 *name, UINT32 *ret);
EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const CHAR16 *name, UINT64 *ret);
EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const CHAR16 *name, BOOLEAN *ret);
CHAR8 *strchra(CHAR8 *s, CHAR8 c);