1 files changed, 70 insertions, 0 deletions
diff --git a/include/scsi_emul.h b/include/scsi_emul.h
new file mode 100644
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+++ b/include/scsi_emul.h
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Emulation of enough SCSI commands to find and read from a unit
+ *
+ * Copyright 2022 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * implementations of SCSI functions required so that CONFIG_SCSI can be enabled
+ * for sandbox
+ */
+
+#ifndef __scsi_emul_h
+#define __scsi_emul_h
+
+/**
+ * struct scsi_emul_info - information for emulating a SCSI device
+ *
+ * @vendor: Vendor name
+ * @product: Product name
+ * @block_size: Block size of device in bytes (normally 512)
+ * @file_size: Size of the backing file for this emulator, in bytes
+ * @seek_block: Seek position for file (block number)
+ *
+ * @phase: Current SCSI phase
+ * @buff_used: Number of bytes ready to transfer back to host
+ * @read_len: Number of bytes of data left in the current read command
+ * @alloc_len: Allocation length from the last incoming command
+ * @transfer_len: Transfer length from CBW header
+ * @buff: Data buffer for outgoing data
+ */
+struct scsi_emul_info {
+	/* provided by the caller: */
+	void *buff;
+	const char *vendor;
+	const char *product;
+	int block_size;
+	loff_t file_size;
+	int seek_block;
+
+	/* state maintained by the emulator: */
+	enum scsi_cmd_phase phase;
+	int buff_used;
+	int read_len;
+	uint seek_pos;
+	int alloc_len;
+	uint transfer_len;
+};
+
+/* Indicates that a read is being started */
+#define SCSI_EMUL_DO_READ	1
+
+/**
+ * sb_scsi_emul_command() - Process a SCSI command
+ *
+ * This sets up the response in info->buff and updates various other values
+ * in info.
+ *
+ * If SCSI_EMUL_DO_READ is returned then the caller should set up so that the
+ * backing file can be read, or return an error status if there is no file.
+ *
+ * @info: Emulation information
+ * @req: Request to process
+ * @len: Length of request in bytes
+ * @return SCSI_EMUL_DO_READ if a read has started, 0 if some other operation
+ *	has started, -ve if there was an error
+ */
+int sb_scsi_emul_command(struct scsi_emul_info *info,
+			 const struct scsi_cmd *req, int len);
+
+#endif