This file defines the register interface of the uefi-vars device.
It's only a handful of registers: magic value, command and status
registers, location and size of the communication buffer.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20250225163031.1409078-3-kraxel@redhat.com>
---
 include/hw/uefi/var-service-api.h | 48 +++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 include/hw/uefi/var-service-api.h

diff --git a/include/hw/uefi/var-service-api.h b/include/hw/uefi/var-service-api.h
new file mode 100644
index 000000000000..0d71638f3efe
--- /dev/null
+++ b/include/hw/uefi/var-service-api.h
@@ -0,0 +1,48 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * uefi-vars device - API of the virtual device for guest/host communication.
+ */
+#ifndef QEMU_UEFI_VAR_SERVICE_API_H
+#define QEMU_UEFI_VAR_SERVICE_API_H
+
+/* qom: device names */
+#define TYPE_UEFI_VARS_X64       "uefi-vars-x64"
+#define TYPE_UEFI_VARS_SYSBUS    "uefi-vars-sysbus"
+
+/* sysbus: fdt node path */
+#define UEFI_VARS_FDT_NODE       "qemu-uefi-vars"
+#define UEFI_VARS_FDT_COMPAT     "qemu,uefi-vars"
+
+/* registers */
+#define UEFI_VARS_REG_MAGIC                  0x00  /* 16 bit */
+#define UEFI_VARS_REG_CMD_STS                0x02  /* 16 bit */
+#define UEFI_VARS_REG_BUFFER_SIZE            0x04  /* 32 bit */
+#define UEFI_VARS_REG_DMA_BUFFER_ADDR_LO     0x08  /* 32 bit */
+#define UEFI_VARS_REG_DMA_BUFFER_ADDR_HI     0x0c  /* 32 bit */
+#define UEFI_VARS_REG_PIO_BUFFER_TRANSFER    0x10  /* 8-64 bit */
+#define UEFI_VARS_REG_PIO_BUFFER_CRC32C      0x18  /* 32 bit (read-only) */
+#define UEFI_VARS_REG_FLAGS                  0x1c  /* 32 bit */
+#define UEFI_VARS_REGS_SIZE                  0x20
+
+/* flags register */
+#define UEFI_VARS_FLAG_USE_PIO           (1 << 0)
+
+/* magic value */
+#define UEFI_VARS_MAGIC_VALUE               0xef1
+
+/* command values */
+#define UEFI_VARS_CMD_RESET                  0x01
+#define UEFI_VARS_CMD_DMA_MM                 0x02
+#define UEFI_VARS_CMD_PIO_MM                 0x03
+#define UEFI_VARS_CMD_PIO_ZERO_OFFSET        0x04
+
+/* status values */
+#define UEFI_VARS_STS_SUCCESS                0x00
+#define UEFI_VARS_STS_BUSY                   0x01
+#define UEFI_VARS_STS_ERR_UNKNOWN            0x10
+#define UEFI_VARS_STS_ERR_NOT_SUPPORTED      0x11
+#define UEFI_VARS_STS_ERR_BAD_BUFFER_SIZE    0x12
+
+
+#endif /* QEMU_UEFI_VAR_SERVICE_API_H */
-- 
2.48.1