1 files changed, 149 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/drivers/nvs/nvs.c b/debian/grub-extras/disabled/gpxe/src/drivers/nvs/nvs.c
new file mode 100644
index 0000000..7252808
--- /dev/null
+++ b/debian/grub-extras/disabled/gpxe/src/drivers/nvs/nvs.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * 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 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <gpxe/nvs.h>
+
+/** @file
+ *
+ * Non-volatile storage
+ *
+ */
+
+/**
+ * Read from non-volatile storage device
+ *
+ * @v nvs		NVS device
+ * @v address		Address from which to read
+ * @v data		Data buffer
+ * @v len		Length of data buffer
+ * @ret rc		Return status code
+ */
+int nvs_read ( struct nvs_device *nvs, unsigned int address,
+	       void *data, size_t len ) {
+	size_t frag_len;
+	int rc;
+
+	/* We don't even attempt to handle buffer lengths that aren't
+	 * an integral number of words.
+	 */
+	assert ( ( len & ( ( 1 << nvs->word_len_log2 ) - 1 ) ) == 0 );
+
+	while ( len ) {
+
+		/* Calculate space remaining up to next block boundary */
+		frag_len = ( ( nvs->block_size -
+			       ( address & ( nvs->block_size - 1 ) ) )
+			     << nvs->word_len_log2 );
+
+		/* Limit to space remaining in buffer */
+		if ( frag_len > len )
+			frag_len = len;
+
+		/* Read this portion of the buffer from the device */
+		if ( ( rc = nvs->read ( nvs, address, data, frag_len ) ) != 0 )
+			return rc;
+
+		/* Update parameters */
+		data += frag_len;
+		address += ( frag_len >> nvs->word_len_log2 );
+		len -= frag_len;
+	}
+
+	return 0;
+}
+
+/**
+ * Verify content of non-volatile storage device
+ *
+ * @v nvs		NVS device
+ * @v address		Address from which to read
+ * @v data		Data to compare against
+ * @v len		Length of data buffer
+ * @ret rc		Return status code
+ */
+static int nvs_verify ( struct nvs_device *nvs, unsigned int address,
+			const void *data, size_t len ) {
+	uint8_t read_data[len];
+	int rc;
+
+	/* Read data into temporary buffer */
+	if ( ( rc = nvs_read ( nvs, address, read_data, len ) ) != 0 )
+		return rc;
+
+	/* Compare data */
+	if ( memcmp ( data, read_data, len ) != 0 ) {
+		DBG ( "NVS %p verification failed at %#04x+%zd\n",
+		      nvs, address, len );
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * Write to non-volatile storage device
+ *
+ * @v nvs		NVS device
+ * @v address		Address to which to write
+ * @v data		Data buffer
+ * @v len		Length of data buffer
+ * @ret rc		Return status code
+ */
+int nvs_write ( struct nvs_device *nvs, unsigned int address,
+		const void *data, size_t len ) {
+	size_t frag_len;
+	int rc;
+
+	/* We don't even attempt to handle buffer lengths that aren't
+	 * an integral number of words.
+	 */
+	assert ( ( len & ( ( 1 << nvs->word_len_log2 ) - 1 ) ) == 0 );
+
+	while ( len ) {
+
+		/* Calculate space remaining up to next block boundary */
+		frag_len = ( ( nvs->block_size -
+			       ( address & ( nvs->block_size - 1 ) ) )
+			     << nvs->word_len_log2 );
+
+		/* Limit to space remaining in buffer */
+		if ( frag_len > len )
+			frag_len = len;
+
+		/* Write this portion of the buffer to the device */
+		if ( ( rc = nvs->write ( nvs, address, data, frag_len ) ) != 0)
+			return rc;
+
+		/* Read back and verify data */
+		if ( ( rc = nvs_verify ( nvs, address, data, frag_len ) ) != 0)
+			return rc;
+
+		/* Update parameters */
+		data += frag_len;
+		address += ( frag_len >> nvs->word_len_log2 );
+		len -= frag_len;
+	}
+
+	return 0;
+}