Fix x86 FSP freestanding build regressions

Author: danielinux

src/x86/ata.c

@@ -457,14 +457,19 @@ static int security_command_passphrase(int drv, uint8_t ata_cmd,
     struct hba_cmd_table *tbl;
     struct fis_reg_h2d *cmdfis;
     struct ata_drive *ata = &ATA_Drv[drv];
+    size_t passphrase_len = 0;
     int ret;
     int slot = prepare_cmd_h2d_slot(drv, buffer,
             ATA_SECURITY_COMMAND_LEN, 1);
     memset(buffer, 0, ATA_SECURITY_COMMAND_LEN);
     if (master)
         buffer[0] = 0x1;
+    while (passphrase_len < ATA_SECURITY_PASSWORD_LEN &&
+           passphrase[passphrase_len] != '\0') {
+        passphrase_len++;
+    }
     memcpy(buffer + ATA_SECURITY_PASSWORD_OFFSET, passphrase,
-           strnlen(passphrase, ATA_SECURITY_PASSWORD_LEN));
+           passphrase_len);
     if (slot < 0) {
         return slot;
     }

src/x86/mptable.c

@@ -33,7 +33,7 @@
 /* TGL mptable */
 static struct mptable _mptable = {
     .mpf = {
-        .signature = "_MP_",
+        .signature = {'_', 'M', 'P', '_'},
         .phy_addr = (int)MPTABLE_LOAD_BASE + sizeof(struct mp_float),
         .length = 1,
         .spec_rev = 0x4,
@@ -45,7 +45,7 @@ static struct mptable _mptable = {
         .feature5 = 0
     },
     .mpc_table = {
-        .signature = MPC_SIGNATURE,
+        .signature = {'P', 'C', 'M', 'P'},
         .base_table_len = sizeof(struct mp_conf_table_header) +
             sizeof(struct mp_conf_entry_processor) * MP_CPU_NUM_ENTRY +
             sizeof(struct mp_conf_entry_bus) * MP_BUS_NUM_ENTRY +
@@ -248,7 +248,7 @@ static struct mptable _mptable = {
 /* MPtables for qemu */
 struct mptable _mptable = {
     .mpf = {
-        .signature = "_MP_",
+        .signature = {'_', 'M', 'P', '_'},
         .phy_addr = (int)MPTABLE_LOAD_BASE + sizeof(struct mp_float),
         .length = 1,
         .spec_rev = 1,
@@ -260,7 +260,7 @@ struct mptable _mptable = {
         .feature5 = 0
     },
     .mpc_table = {
-        .signature = MPC_SIGNATURE,
+        .signature = {'P', 'C', 'M', 'P'},
         .base_table_len = sizeof(struct mp_conf_table_header) +
             sizeof(struct mp_conf_entry_processor) * MP_CPU_NUM_ENTRY +
             sizeof(struct mp_conf_entry_bus) * MP_BUS_NUM_ENTRY +