x86: qemu: Move qfw command over to cmd and add Kconfig entry

- Move the command portion of arch/x86/cpu/qemu/fw_cfg.c into
  cmd/qemu_fw_cfg.c
- Move arch/x86/include/asm/fw_cfg.h to include/qemu_fw_cfg.h
- Rename ACPI table portion to arch/x86/cpu/qemu/acpi_table.c

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

11 files changed, 272 insertions, 241 deletions

diff --git a/arch/x86/cpu/mp_init.c b/arch/x86/cpu/mp_init.c
index 2604a687ab..13bec7ae1e 100644
--- a/arch/x86/cpu/mp_init.c
+++ b/arch/x86/cpu/mp_init.c
@@ -11,6 +11,7 @@
 #include <dm.h>
 #include <errno.h>
 #include <malloc.h>
+#include <qemu_fw_cfg.h>
 #include <asm/atomic.h>
 #include <asm/cpu.h>
 #include <asm/interrupt.h>
@@ -21,7 +22,6 @@
 #include <asm/mtrr.h>
 #include <asm/processor.h>
 #include <asm/sipi.h>
-#include <asm/fw_cfg.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #include <dm/lists.h>
diff --git a/arch/x86/cpu/qemu/Makefile b/arch/x86/cpu/qemu/Makefile
index 6eeddf154e..97b965c3de 100644
--- a/arch/x86/cpu/qemu/Makefile
+++ b/arch/x86/cpu/qemu/Makefile
@@ -7,4 +7,5 @@
 ifndef CONFIG_EFI_STUB
 obj-y += car.o dram.o
 endif
-obj-y += cpu.o fw_cfg.o qemu.o
+obj-y += cpu.o qemu.o
+obj-$(CONFIG_QEMU_ACPI_TABLE) += acpi_table.o
diff --git a/arch/x86/cpu/qemu/acpi_table.c b/arch/x86/cpu/qemu/acpi_table.c
new file mode 100644
index 0000000000..49381acd29
--- /dev/null
+++ b/arch/x86/cpu/qemu/acpi_table.c
@@ -0,0 +1,243 @@
+/*
+ * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <malloc.h>
+#include <qemu_fw_cfg.h>
+#include <asm/io.h>
+#include <asm/tables.h>
+#include <asm/e820.h>
+#include <linux/list.h>
+#include <memalign.h>
+
+/*
+ * This function allocates memory for ACPI tables
+ *
+ * @entry : BIOS linker command entry which tells where to allocate memory
+ *          (either high memory or low memory)
+ * @addr  : The address that should be used for low memory allcation. If the
+ *          memory allocation request is 'ZONE_HIGH' then this parameter will
+ *          be ignored.
+ * @return: 0 on success, or negative value on failure
+ */
+static int bios_linker_allocate(struct bios_linker_entry *entry, u32 *addr)
+{
+	uint32_t size, align;
+	struct fw_file *file;
+	unsigned long aligned_addr;
+
+	align = le32_to_cpu(entry->alloc.align);
+	/* align must be power of 2 */
+	if (align & (align - 1)) {
+		printf("error: wrong alignment %u\n", align);
+		return -EINVAL;
+	}
+
+	file = qemu_fwcfg_find_file(entry->alloc.file);
+	if (!file) {
+		printf("error: can't find file %s\n", entry->alloc.file);
+		return -ENOENT;
+	}
+
+	size = be32_to_cpu(file->cfg.size);
+
+	/*
+	 * ZONE_HIGH means we need to allocate from high memory, since
+	 * malloc space is already at the end of RAM, so we directly use it.
+	 * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
+	 * in which is low memory
+	 */
+	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
+		aligned_addr = (unsigned long)memalign(align, size);
+		if (!aligned_addr) {
+			printf("error: allocating resource\n");
+			return -ENOMEM;
+		}
+	} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
+		aligned_addr = ALIGN(*addr, align);
+	} else {
+		printf("error: invalid allocation zone\n");
+		return -EINVAL;
+	}
+
+	debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
+	      file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
+
+	qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
+			      size, (void *)aligned_addr);
+	file->addr = aligned_addr;
+
+	/* adjust address for low memory allocation */
+	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
+		*addr = (aligned_addr + size);
+
+	return 0;
+}
+
+/*
+ * This function patches ACPI tables previously loaded
+ * by bios_linker_allocate()
+ *
+ * @entry : BIOS linker command entry which tells how to patch
+ *          ACPI tables
+ * @return: 0 on success, or negative value on failure
+ */
+static int bios_linker_add_pointer(struct bios_linker_entry *entry)
+{
+	struct fw_file *dest, *src;
+	uint32_t offset = le32_to_cpu(entry->pointer.offset);
+	uint64_t pointer = 0;
+
+	dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
+	if (!dest || !dest->addr)
+		return -ENOENT;
+	src = qemu_fwcfg_find_file(entry->pointer.src_file);
+	if (!src || !src->addr)
+		return -ENOENT;
+
+	debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
+	      dest->addr, src->addr, offset, entry->pointer.size, pointer);
+
+	memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
+	pointer	= le64_to_cpu(pointer);
+	pointer += (unsigned long)src->addr;
+	pointer	= cpu_to_le64(pointer);
+	memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
+
+	return 0;
+}
+
+/*
+ * This function updates checksum fields of ACPI tables previously loaded
+ * by bios_linker_allocate()
+ *
+ * @entry : BIOS linker command entry which tells where to update ACPI table
+ *          checksums
+ * @return: 0 on success, or negative value on failure
+ */
+static int bios_linker_add_checksum(struct bios_linker_entry *entry)
+{
+	struct fw_file *file;
+	uint8_t *data, cksum = 0;
+	uint8_t *cksum_start;
+
+	file = qemu_fwcfg_find_file(entry->cksum.file);
+	if (!file || !file->addr)
+		return -ENOENT;
+
+	data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
+	cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
+	cksum = table_compute_checksum(cksum_start,
+				       le32_to_cpu(entry->cksum.length));
+	*data = cksum;
+
+	return 0;
+}
+
+unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
+{
+	entries[0].addr = 0;
+	entries[0].size = ISA_START_ADDRESS;
+	entries[0].type = E820_RAM;
+
+	entries[1].addr = ISA_START_ADDRESS;
+	entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
+	entries[1].type = E820_RESERVED;
+
+	/*
+	 * since we use memalign(malloc) to allocate high memory for
+	 * storing ACPI tables, we need to reserve them in e820 tables,
+	 * otherwise kernel will reclaim them and data will be corrupted
+	 */
+	entries[2].addr = ISA_END_ADDRESS;
+	entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
+	entries[2].type = E820_RAM;
+
+	/* for simplicity, reserve entire malloc space */
+	entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
+	entries[3].size = TOTAL_MALLOC_LEN;
+	entries[3].type = E820_RESERVED;
+
+	entries[4].addr = gd->relocaddr;
+	entries[4].size = gd->ram_size - gd->relocaddr;
+	entries[4].type = E820_RESERVED;
+
+	entries[5].addr = CONFIG_PCIE_ECAM_BASE;
+	entries[5].size = CONFIG_PCIE_ECAM_SIZE;
+	entries[5].type = E820_RESERVED;
+
+	return 6;
+}
+
+/* This function loads and patches ACPI tables provided by QEMU */
+u32 write_acpi_tables(u32 addr)
+{
+	int i, ret = 0;
+	struct fw_file *file;
+	struct bios_linker_entry *table_loader;
+	struct bios_linker_entry *entry;
+	uint32_t size;
+
+	/* make sure fw_list is loaded */
+	ret = qemu_fwcfg_read_firmware_list();
+	if (ret) {
+		printf("error: can't read firmware file list\n");
+		return addr;
+	}
+
+	file = qemu_fwcfg_find_file("etc/table-loader");
+	if (!file) {
+		printf("error: can't find etc/table-loader\n");
+		return addr;
+	}
+
+	size = be32_to_cpu(file->cfg.size);
+	if ((size % sizeof(*entry)) != 0) {
+		printf("error: table-loader maybe corrupted\n");
+		return addr;
+	}
+
+	table_loader = malloc(size);
+	if (!table_loader) {
+		printf("error: no memory for table-loader\n");
+		return addr;
+	}
+
+	qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
+			      size, table_loader);
+
+	for (i = 0; i < (size / sizeof(*entry)); i++) {
+		entry = table_loader + i;
+		switch (le32_to_cpu(entry->command)) {
+		case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
+			ret = bios_linker_allocate(entry, &addr);
+			if (ret)
+				goto out;
+			break;
+		case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
+			ret = bios_linker_add_pointer(entry);
+			if (ret)
+				goto out;
+			break;
+		case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
+			ret = bios_linker_add_checksum(entry);
+			if (ret)
+				goto out;
+			break;
+		default:
+			break;
+		}
+	}
+
+out:
+	if (ret)
+		qemu_fwcfg_free_files();
+
+	free(table_loader);
+	return addr;
+}
diff --git a/arch/x86/cpu/qemu/cpu.c b/arch/x86/cpu/qemu/cpu.c
index a1b70c6bde..4d2989a708 100644
--- a/arch/x86/cpu/qemu/cpu.c
+++ b/arch/x86/cpu/qemu/cpu.c
@@ -8,8 +8,8 @@
 #include <cpu.h>
 #include <dm.h>
 #include <errno.h>
+#include <qemu_fw_cfg.h>
 #include <asm/cpu.h>
-#include <asm/fw_cfg.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
diff --git a/arch/x86/cpu/qemu/qemu.c b/arch/x86/cpu/qemu/qemu.c
index 7ad0ee49a1..b41e4ecbec 100644
--- a/arch/x86/cpu/qemu/qemu.c
+++ b/arch/x86/cpu/qemu/qemu.c
@@ -6,12 +6,12 @@
 
 #include <common.h>
 #include <pci.h>
+#include <qemu_fw_cfg.h>
 #include <asm/irq.h>
 #include <asm/post.h>
 #include <asm/processor.h>
 #include <asm/arch/device.h>
 #include <asm/arch/qemu.h>
-#include <asm/fw_cfg.h>
 
 static bool i440fx;
 
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index 989cf7d5de..be7b824525 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -303,7 +303,7 @@ static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
 
 /*
  * QEMU's version of write_acpi_tables is defined in
- * arch/x86/cpu/qemu/fw_cfg.c
+ * arch/x86/cpu/qemu/acpi_table.c
  */
 u32 write_acpi_tables(u32 start)
 {
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 9336752128..c0fffe305c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -593,6 +593,13 @@ config CMD_SOUND
 	     sound init   - set up sound system
 	     sound play   - play a sound
 
+config CMD_QEMU_FW_CFG
+	bool "qfw"
+	depends on X86
+	help
+	  This provides access to the QEMU firmware interface.  The main
+	  feature is to allow easy loading of files passed to qemu-system
+	  via -kernel / -initrd
 endmenu
 
 config CMD_BOOTSTAGE
diff --git a/cmd/Makefile b/cmd/Makefile
index e3e0c74ffc..d4432c84d9 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -105,6 +105,7 @@ endif
 obj-y += pcmcia.o
 obj-$(CONFIG_CMD_PORTIO) += portio.o
 obj-$(CONFIG_CMD_PXE) += pxe.o
+obj-$(CONFIG_CMD_QEMU_FW_CFG) += qemu_fw_cfg.o
 obj-$(CONFIG_CMD_READ) += read.o
 obj-$(CONFIG_CMD_REGINFO) += reginfo.o
 obj-$(CONFIG_CMD_REISER) += reiser.o
diff --git a/arch/x86/cpu/qemu/fw_cfg.c b/cmd/qemu_fw_cfg.c
index 2e2794ebd7..48ae47683f 100644
--- a/arch/x86/cpu/qemu/fw_cfg.c
+++ b/cmd/qemu_fw_cfg.c
@@ -8,12 +8,9 @@
 #include <command.h>
 #include <errno.h>
 #include <malloc.h>
+#include <qemu_fw_cfg.h>
 #include <asm/io.h>
-#include <asm/fw_cfg.h>
-#include <asm/tables.h>
-#include <asm/e820.h>
 #include <linux/list.h>
-#include <memalign.h>
 
 static bool fwcfg_present;
 static bool fwcfg_dma_present;
@@ -84,8 +81,7 @@ static bool qemu_fwcfg_dma_present(void)
 	return false;
 }
 
-static void qemu_fwcfg_read_entry(uint16_t entry,
-		uint32_t length, void *address)
+void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address)
 {
 	if (fwcfg_dma_present)
 		qemu_fwcfg_read_entry_dma(entry, length, address);
@@ -168,7 +164,7 @@ static int qemu_fwcfg_setup_kernel(void *load_addr, void *initrd_addr)
 	return 0;
 }
 
-static int qemu_fwcfg_read_firmware_list(void)
+int qemu_fwcfg_read_firmware_list(void)
 {
 	int i;
 	uint32_t count;
@@ -207,8 +203,7 @@ err:
 	return -ENOMEM;
 }
 
-#ifdef CONFIG_QEMU_ACPI_TABLE
-static struct fw_file *qemu_fwcfg_find_file(const char *name)
+struct fw_file *qemu_fwcfg_find_file(const char *name)
 {
 	struct list_head *entry;
 	struct fw_file *file;
@@ -222,239 +217,17 @@ static struct fw_file *qemu_fwcfg_find_file(const char *name)
 	return NULL;
 }
 
-/*
- * This function allocates memory for ACPI tables
- *
- * @entry : BIOS linker command entry which tells where to allocate memory
- *          (either high memory or low memory)
- * @addr  : The address that should be used for low memory allcation. If the
- *          memory allocation request is 'ZONE_HIGH' then this parameter will
- *          be ignored.
- * @return: 0 on success, or negative value on failure
- */
-static int bios_linker_allocate(struct bios_linker_entry *entry, u32 *addr)
-{
-	uint32_t size, align;
-	struct fw_file *file;
-	unsigned long aligned_addr;
-
-	align = le32_to_cpu(entry->alloc.align);
-	/* align must be power of 2 */
-	if (align & (align - 1)) {
-		printf("error: wrong alignment %u\n", align);
-		return -EINVAL;
-	}
-
-	file = qemu_fwcfg_find_file(entry->alloc.file);
-	if (!file) {
-		printf("error: can't find file %s\n", entry->alloc.file);
-		return -ENOENT;
-	}
-
-	size = be32_to_cpu(file->cfg.size);
-
-	/*
-	 * ZONE_HIGH means we need to allocate from high memory, since
-	 * malloc space is already at the end of RAM, so we directly use it.
-	 * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
-	 * in which is low memory
-	 */
-	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
-		aligned_addr = (unsigned long)memalign(align, size);
-		if (!aligned_addr) {
-			printf("error: allocating resource\n");
-			return -ENOMEM;
-		}
-	} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
-		aligned_addr = ALIGN(*addr, align);
-	} else {
-		printf("error: invalid allocation zone\n");
-		return -EINVAL;
-	}
-
-	debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
-	      file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
-
-	qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
-			      size, (void *)aligned_addr);
-	file->addr = aligned_addr;
-
-	/* adjust address for low memory allocation */
-	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
-		*addr = (aligned_addr + size);
-
-	return 0;
-}
-
-/*
- * This function patches ACPI tables previously loaded
- * by bios_linker_allocate()
- *
- * @entry : BIOS linker command entry which tells how to patch
- *          ACPI tables
- * @return: 0 on success, or negative value on failure
- */
-static int bios_linker_add_pointer(struct bios_linker_entry *entry)
-{
-	struct fw_file *dest, *src;
-	uint32_t offset = le32_to_cpu(entry->pointer.offset);
-	uint64_t pointer = 0;
-
-	dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
-	if (!dest || !dest->addr)
-		return -ENOENT;
-	src = qemu_fwcfg_find_file(entry->pointer.src_file);
-	if (!src || !src->addr)
-		return -ENOENT;
-
-	debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
-	      dest->addr, src->addr, offset, entry->pointer.size, pointer);
-
-	memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
-	pointer	= le64_to_cpu(pointer);
-	pointer += (unsigned long)src->addr;
-	pointer	= cpu_to_le64(pointer);
-	memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
-
-	return 0;
-}
-
-/*
- * This function updates checksum fields of ACPI tables previously loaded
- * by bios_linker_allocate()
- *
- * @entry : BIOS linker command entry which tells where to update ACPI table
- *          checksums
- * @return: 0 on success, or negative value on failure
- */
-static int bios_linker_add_checksum(struct bios_linker_entry *entry)
+void qemu_fwcfg_free_files(void)
 {
 	struct fw_file *file;
-	uint8_t *data, cksum = 0;
-	uint8_t *cksum_start;
-
-	file = qemu_fwcfg_find_file(entry->cksum.file);
-	if (!file || !file->addr)
-		return -ENOENT;
-
-	data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
-	cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
-	cksum = table_compute_checksum(cksum_start,
-				       le32_to_cpu(entry->cksum.length));
-	*data = cksum;
-
-	return 0;
-}
-
-unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
-{
-	entries[0].addr = 0;
-	entries[0].size = ISA_START_ADDRESS;
-	entries[0].type = E820_RAM;
-
-	entries[1].addr = ISA_START_ADDRESS;
-	entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
-	entries[1].type = E820_RESERVED;
-
-	/*
-	 * since we use memalign(malloc) to allocate high memory for
-	 * storing ACPI tables, we need to reserve them in e820 tables,
-	 * otherwise kernel will reclaim them and data will be corrupted
-	 */
-	entries[2].addr = ISA_END_ADDRESS;
-	entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
-	entries[2].type = E820_RAM;
-
-	/* for simplicity, reserve entire malloc space */
-	entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
-	entries[3].size = TOTAL_MALLOC_LEN;
-	entries[3].type = E820_RESERVED;
-
-	entries[4].addr = gd->relocaddr;
-	entries[4].size = gd->ram_size - gd->relocaddr;
-	entries[4].type = E820_RESERVED;
-
-	entries[5].addr = CONFIG_PCIE_ECAM_BASE;
-	entries[5].size = CONFIG_PCIE_ECAM_SIZE;
-	entries[5].type = E820_RESERVED;
-
-	return 6;
-}
-
-/* This function loads and patches ACPI tables provided by QEMU */
-u32 write_acpi_tables(u32 addr)
-{
-	int i, ret = 0;
-	struct fw_file *file;
-	struct bios_linker_entry *table_loader;
-	struct bios_linker_entry *entry;
-	uint32_t size;
 	struct list_head *list;
 
-	/* make sure fw_list is loaded */
-	ret = qemu_fwcfg_read_firmware_list();
-	if (ret) {
-		printf("error: can't read firmware file list\n");
-		return addr;
+	list_for_each(list, &fw_list) {
+		file = list_entry(list, struct fw_file, list);
+		if (file->addr)
+			free((void *)file->addr);
 	}
-
-	file = qemu_fwcfg_find_file("etc/table-loader");
-	if (!file) {
-		printf("error: can't find etc/table-loader\n");
-		return addr;
-	}
-
-	size = be32_to_cpu(file->cfg.size);
-	if ((size % sizeof(*entry)) != 0) {
-		printf("error: table-loader maybe corrupted\n");
-		return addr;
-	}
-
-	table_loader = malloc(size);
-	if (!table_loader) {
-		printf("error: no memory for table-loader\n");
-		return addr;
-	}
-
-	qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
-			      size, table_loader);
-
-	for (i = 0; i < (size / sizeof(*entry)); i++) {
-		entry = table_loader + i;
-		switch (le32_to_cpu(entry->command)) {
-		case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
-			ret = bios_linker_allocate(entry, &addr);
-			if (ret)
-				goto out;
-			break;
-		case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
-			ret = bios_linker_add_pointer(entry);
-			if (ret)
-				goto out;
-			break;
-		case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
-			ret = bios_linker_add_checksum(entry);
-			if (ret)
-				goto out;
-			break;
-		default:
-			break;
-		}
-	}
-
-out:
-	if (ret) {
-		list_for_each(list, &fw_list) {
-			file = list_entry(list, struct fw_file, list);
-			if (file->addr)
-				free((void *)file->addr);
-		}
-	}
-
-	free(table_loader);
-	return addr;
 }
-#endif
 
 static int qemu_fwcfg_list_firmware(void)
 {
diff --git a/configs/qemu-x86_defconfig b/configs/qemu-x86_defconfig
index 53b1ff65af..a813e5b438 100644
--- a/configs/qemu-x86_defconfig
+++ b/configs/qemu-x86_defconfig
@@ -20,6 +20,7 @@ CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_PING=y
 CONFIG_CMD_TIME=y
+CONFIG_CMD_QEMU_FW_CFG=y
 CONFIG_CMD_BOOTSTAGE=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
diff --git a/arch/x86/include/asm/fw_cfg.h b/include/qemu_fw_cfg.h
index e9450c6196..e21f1503c0 100644
--- a/arch/x86/include/asm/fw_cfg.h
+++ b/include/qemu_fw_cfg.h
@@ -147,6 +147,11 @@ struct bios_linker_entry {
  */
 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
  *