summaryrefslogtreecommitdiffstats
path: root/drivers/eeprom/eeprom_transient.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/eeprom/eeprom_transient.c')
-rw-r--r--drivers/eeprom/eeprom_transient.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/eeprom/eeprom_transient.c b/drivers/eeprom/eeprom_transient.c
new file mode 100644
index 0000000000..b4c78c6f40
--- /dev/null
+++ b/drivers/eeprom/eeprom_transient.c
@@ -0,0 +1,52 @@
+/* Copyright 2019 Nick Brassel (tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "eeprom_driver.h"
+#include "eeprom_transient.h"
+
+__attribute__((aligned(4))) static uint8_t transientBuffer[TRANSIENT_EEPROM_SIZE] = {0};
+
+size_t clamp_length(intptr_t offset, size_t len) {
+ if (offset + len > TRANSIENT_EEPROM_SIZE) {
+ len = TRANSIENT_EEPROM_SIZE - offset;
+ }
+
+ return len;
+}
+
+void eeprom_driver_init(void) { eeprom_driver_erase(); }
+
+void eeprom_driver_erase(void) { memset(transientBuffer, 0x00, TRANSIENT_EEPROM_SIZE); }
+
+void eeprom_read_block(void *buf, const void *addr, size_t len) {
+ intptr_t offset = (intptr_t)addr;
+ memset(buf, 0x00, len);
+ len = clamp_length(offset, len);
+ if (len > 0) {
+ memcpy(buf, &transientBuffer[offset], len);
+ }
+}
+
+void eeprom_write_block(const void *buf, void *addr, size_t len) {
+ intptr_t offset = (intptr_t)addr;
+ len = clamp_length(offset, len);
+ if (len > 0) {
+ memcpy(&transientBuffer[offset], buf, len);
+ }
+}