1 files changed, 162 insertions, 0 deletions
diff --git a/include/qemu_fw_cfg.h b/include/qemu_fw_cfg.h
new file mode 100644
index 0000000..e21f150
--- /dev/null
+++ b/include/qemu_fw_cfg.h
@@ -0,0 +1,162 @@
+/*
+ * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __FW_CFG__
+#define __FW_CFG__
+
+#define FW_CONTROL_PORT	0x510
+#define FW_DATA_PORT		0x511
+#define FW_DMA_PORT_LOW	0x514
+#define FW_DMA_PORT_HIGH	0x518
+
+#include <linux/list.h>
+
+enum qemu_fwcfg_items {
+	FW_CFG_SIGNATURE	= 0x00,
+	FW_CFG_ID		= 0x01,
+	FW_CFG_UUID		= 0x02,
+	FW_CFG_RAM_SIZE		= 0x03,
+	FW_CFG_NOGRAPHIC	= 0x04,
+	FW_CFG_NB_CPUS		= 0x05,
+	FW_CFG_MACHINE_ID	= 0x06,
+	FW_CFG_KERNEL_ADDR	= 0x07,
+	FW_CFG_KERNEL_SIZE	= 0x08,
+	FW_CFG_KERNEL_CMDLINE   = 0x09,
+	FW_CFG_INITRD_ADDR	= 0x0a,
+	FW_CFG_INITRD_SIZE	= 0x0b,
+	FW_CFG_BOOT_DEVICE	= 0x0c,
+	FW_CFG_NUMA		= 0x0d,
+	FW_CFG_BOOT_MENU	= 0x0e,
+	FW_CFG_MAX_CPUS		= 0x0f,
+	FW_CFG_KERNEL_ENTRY	= 0x10,
+	FW_CFG_KERNEL_DATA	= 0x11,
+	FW_CFG_INITRD_DATA	= 0x12,
+	FW_CFG_CMDLINE_ADDR	= 0x13,
+	FW_CFG_CMDLINE_SIZE	= 0x14,
+	FW_CFG_CMDLINE_DATA	= 0x15,
+	FW_CFG_SETUP_ADDR	= 0x16,
+	FW_CFG_SETUP_SIZE	= 0x17,
+	FW_CFG_SETUP_DATA	= 0x18,
+	FW_CFG_FILE_DIR		= 0x19,
+	FW_CFG_FILE_FIRST	= 0x20,
+	FW_CFG_WRITE_CHANNEL	= 0x4000,
+	FW_CFG_ARCH_LOCAL	= 0x8000,
+	FW_CFG_INVALID		= 0xffff,
+};
+
+enum {
+	BIOS_LINKER_LOADER_COMMAND_ALLOCATE	= 0x1,
+	BIOS_LINKER_LOADER_COMMAND_ADD_POINTER  = 0x2,
+	BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
+};
+
+enum {
+	BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
+	BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
+};
+
+#define FW_CFG_FILE_SLOTS	0x10
+#define FW_CFG_MAX_ENTRY	(FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS)
+#define FW_CFG_ENTRY_MASK	 ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
+
+#define FW_CFG_MAX_FILE_PATH	56
+#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
+
+#define QEMU_FW_CFG_SIGNATURE	(('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U')
+
+#define FW_CFG_DMA_ERROR	(1 << 0)
+#define FW_CFG_DMA_READ	(1 << 1)
+#define FW_CFG_DMA_SKIP	(1 << 2)
+#define FW_CFG_DMA_SELECT	(1 << 3)
+
+#define FW_CFG_DMA_ENABLED	(1 << 1)
+
+struct fw_cfg_file {
+	__be32 size;
+	__be16 select;
+	__be16 reserved;
+	char name[FW_CFG_MAX_FILE_PATH];
+};
+
+struct fw_file {
+	struct fw_cfg_file cfg; /* firmware file information */
+	unsigned long addr;     /* firmware file in-memory address */
+	struct list_head list;  /* list node to link to fw_list */
+};
+
+struct fw_cfg_dma_access {
+	__be32 control;
+	__be32 length;
+	__be64 address;
+};
+
+struct bios_linker_entry {
+	__le32 command;
+	union {
+		/*
+		 * COMMAND_ALLOCATE - allocate a table from @alloc.file
+		 * subject to @alloc.align alignment (must be power of 2)
+		 * and @alloc.zone (can be HIGH or FSEG) requirements.
+		 *
+		 * Must appear exactly once for each file, and before
+		 * this file is referenced by any other command.
+		 */
+		struct {
+			char file[BIOS_LINKER_LOADER_FILESZ];
+			__le32 align;
+			uint8_t zone;
+		} alloc;
+
+		/*
+		 * COMMAND_ADD_POINTER - patch the table (originating from
+		 * @dest_file) at @pointer.offset, by adding a pointer to the
+		 * table originating from @src_file. 1,2,4 or 8 byte unsigned
+		 * addition is used depending on @pointer.size.
+		 */
+		struct {
+			char dest_file[BIOS_LINKER_LOADER_FILESZ];
+			char src_file[BIOS_LINKER_LOADER_FILESZ];
+			__le32 offset;
+			uint8_t size;
+		} pointer;
+
+		/*
+		 * COMMAND_ADD_CHECKSUM - calculate checksum of the range
+		 * specified by @cksum_start and @cksum_length fields,
+		 * and then add the value at @cksum.offset.
+		 * Checksum simply sums -X for each byte X in the range
+		 * using 8-bit math.
+		 */
+		struct {
+			char file[BIOS_LINKER_LOADER_FILESZ];
+			__le32 offset;
+			__le32 start;
+			__le32 length;
+		} cksum;
+
+		/* padding */
+		char pad[124];
+	};
+} __packed;
+
+/**
+ * Initialize QEMU fw_cfg interface
+ */
+void qemu_fwcfg_init(void);
+
+void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
+int qemu_fwcfg_read_firmware_list(void);
+struct fw_file *qemu_fwcfg_find_file(const char *name);
+void qemu_fwcfg_free_files(void);
+
+/**
+ * Get system cpu number
+ *
+ * @return:   cpu number in system
+ */
+int qemu_fwcfg_online_cpus(void);
+
+#endif