[people/ms/u-boot.git] / drivers / misc / qfw.c

/*
 * (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 <qfw.h>
#include <asm/io.h>
#ifdef CONFIG_GENERATE_ACPI_TABLE
#include <asm/tables.h>
#endif
#include <linux/list.h>

static bool fwcfg_present;
static bool fwcfg_dma_present;
static struct fw_cfg_arch_ops *fwcfg_arch_ops;

static LIST_HEAD(fw_list);

#ifdef CONFIG_GENERATE_ACPI_TABLE
/*
 * 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, ulong *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;
}

/* This function loads and patches ACPI tables provided by QEMU */
ulong write_acpi_tables(ulong 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) {
		struct fw_cfg_file_iter iter;
		for (file = qemu_fwcfg_file_iter_init(&iter);
		     !qemu_fwcfg_file_iter_end(&iter);
		     file = qemu_fwcfg_file_iter_next(&iter)) {
			if (file->addr) {
				free((void *)file->addr);
				file->addr = 0;
			}
		}
	}

	free(table_loader);
	return addr;
}
#endif

/* Read configuration item using fw_cfg PIO interface */
static void qemu_fwcfg_read_entry_pio(uint16_t entry,
		uint32_t size, void *address)
{
	debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n",
	      entry, size, address);

	return fwcfg_arch_ops->arch_read_pio(entry, size, address);
}

/* Read configuration item using fw_cfg DMA interface */
static void qemu_fwcfg_read_entry_dma(uint16_t entry,
		uint32_t size, void *address)
{
	struct fw_cfg_dma_access dma;

	dma.length = cpu_to_be32(size);
	dma.address = cpu_to_be64((uintptr_t)address);
	dma.control = cpu_to_be32(FW_CFG_DMA_READ);

	/*
	 * writting FW_CFG_INVALID will cause read operation to resume at
	 * last offset, otherwise read will start at offset 0
	 */
	if (entry != FW_CFG_INVALID)
		dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));

	barrier();

	debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n",
	      entry, size, address, be32_to_cpu(dma.control));

	fwcfg_arch_ops->arch_read_dma(&dma);
}

bool qemu_fwcfg_present(void)
{
	return fwcfg_present;
}

bool qemu_fwcfg_dma_present(void)
{
	return fwcfg_dma_present;
}

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);
	else
		qemu_fwcfg_read_entry_pio(entry, length, address);
}

int qemu_fwcfg_online_cpus(void)
{
	uint16_t nb_cpus;

	if (!fwcfg_present)
		return -ENODEV;

	qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);

	return le16_to_cpu(nb_cpus);
}

int qemu_fwcfg_read_firmware_list(void)
{
	int i;
	uint32_t count;
	struct fw_file *file;
	struct list_head *entry;

	/* don't read it twice */
	if (!list_empty(&fw_list))
		return 0;

	qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
	if (!count)
		return 0;

	count = be32_to_cpu(count);
	for (i = 0; i < count; i++) {
		file = malloc(sizeof(*file));
		if (!file) {
			printf("error: allocating resource\n");
			goto err;
		}
		qemu_fwcfg_read_entry(FW_CFG_INVALID,
				      sizeof(struct fw_cfg_file), &file->cfg);
		file->addr = 0;
		list_add_tail(&file->list, &fw_list);
	}

	return 0;

err:
	list_for_each(entry, &fw_list) {
		file = list_entry(entry, struct fw_file, list);
		free(file);
	}

	return -ENOMEM;
}

struct fw_file *qemu_fwcfg_find_file(const char *name)
{
	struct list_head *entry;
	struct fw_file *file;

	list_for_each(entry, &fw_list) {
		file = list_entry(entry, struct fw_file, list);
		if (!strcmp(file->cfg.name, name))
			return file;
	}

	return NULL;
}

struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter)
{
	iter->entry = fw_list.next;
	return list_entry((struct list_head *)iter->entry,
			  struct fw_file, list);
}

struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter)
{
	iter->entry = ((struct list_head *)iter->entry)->next;
	return list_entry((struct list_head *)iter->entry,
			  struct fw_file, list);
}

bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter)
{
	return iter->entry == &fw_list;
}

void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops)
{
	uint32_t qemu;
	uint32_t dma_enabled;

	fwcfg_present = false;
	fwcfg_dma_present = false;
	fwcfg_arch_ops = NULL;

	if (!ops || !ops->arch_read_pio || !ops->arch_read_dma)
		return;
	fwcfg_arch_ops = ops;

	qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
	if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE)
		fwcfg_present = true;

	if (fwcfg_present) {
		qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
		if (dma_enabled & FW_CFG_DMA_ENABLED)
			fwcfg_dma_present = true;
	}
}
Commit	Line	Data
fcf5c041 MY	1	/*
	2	* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <common.h>
	8	#include <command.h>
	9	#include <errno.h>
	10	#include <malloc.h>
18686590	11	#include <qfw.h>
fcf5c041	12	#include <asm/io.h>
eece493a MY	13	#ifdef CONFIG_GENERATE_ACPI_TABLE
	14	#include <asm/tables.h>
	15	#endif
fcf5c041 MY	16	#include <linux/list.h>
	17
	18	static bool fwcfg_present;
	19	static bool fwcfg_dma_present;
2e82e745	20	static struct fw_cfg_arch_ops *fwcfg_arch_ops;
fcf5c041 MY	21
	22	static LIST_HEAD(fw_list);
	23
eece493a MY	24	#ifdef CONFIG_GENERATE_ACPI_TABLE
	25	/*
	26	* This function allocates memory for ACPI tables
	27	*
	28	* @entry : BIOS linker command entry which tells where to allocate memory
	29	* (either high memory or low memory)
	30	* @addr : The address that should be used for low memory allcation. If the
	31	* memory allocation request is 'ZONE_HIGH' then this parameter will
	32	* be ignored.
	33	* @return: 0 on success, or negative value on failure
	34	*/
42fd8c19	35	static int bios_linker_allocate(struct bios_linker_entry entry, ulong addr)
eece493a MY	36	{
	37	uint32_t size, align;
	38	struct fw_file *file;
	39	unsigned long aligned_addr;
	40
	41	align = le32_to_cpu(entry->alloc.align);
	42	/* align must be power of 2 */
	43	if (align & (align - 1)) {
	44	printf("error: wrong alignment %u\n", align);
	45	return -EINVAL;
	46	}
	47
	48	file = qemu_fwcfg_find_file(entry->alloc.file);
	49	if (!file) {
	50	printf("error: can't find file %s\n", entry->alloc.file);
	51	return -ENOENT;
	52	}
	53
	54	size = be32_to_cpu(file->cfg.size);
	55
	56	/*
	57	* ZONE_HIGH means we need to allocate from high memory, since
	58	* malloc space is already at the end of RAM, so we directly use it.
	59	* If allocation zone is ZONE_FSEG, then we use the 'addr' passed
	60	* in which is low memory
	61	*/
	62	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
	63	aligned_addr = (unsigned long)memalign(align, size);
	64	if (!aligned_addr) {
	65	printf("error: allocating resource\n");
	66	return -ENOMEM;
	67	}
	68	} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
	69	aligned_addr = ALIGN(*addr, align);
	70	} else {
	71	printf("error: invalid allocation zone\n");
	72	return -EINVAL;
	73	}
	74
	75	debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
	76	file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
	77
	78	qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
	79	size, (void *)aligned_addr);
	80	file->addr = aligned_addr;
	81
	82	/* adjust address for low memory allocation */
	83	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
	84	*addr = (aligned_addr + size);
	85
	86	return 0;
	87	}
	88
	89	/*
	90	* This function patches ACPI tables previously loaded
	91	* by bios_linker_allocate()
	92	*
	93	* @entry : BIOS linker command entry which tells how to patch
	94	* ACPI tables
	95	* @return: 0 on success, or negative value on failure
	96	*/
	97	static int bios_linker_add_pointer(struct bios_linker_entry *entry)
	98	{
	99	struct fw_file dest, src;
100	uint32_t offset = le32_to_cpu(entry->pointer.offset);
101	uint64_t pointer = 0;
102
103	dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
104	if (!dest \|\| !dest->addr)
105	return -ENOENT;
106	src = qemu_fwcfg_find_file(entry->pointer.src_file);
107	if (!src \|\| !src->addr)
108	return -ENOENT;
109
110	debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
111	dest->addr, src->addr, offset, entry->pointer.size, pointer);
112
113	memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
114	pointer = le64_to_cpu(pointer);
115	pointer += (unsigned long)src->addr;
116	pointer = cpu_to_le64(pointer);
117	memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
118
119	return 0;
120	}
121
122	/*
123	* This function updates checksum fields of ACPI tables previously loaded
124	* by bios_linker_allocate()
125	*
126	* @entry : BIOS linker command entry which tells where to update ACPI table
127	* checksums
128	* @return: 0 on success, or negative value on failure
129	*/
130	static int bios_linker_add_checksum(struct bios_linker_entry *entry)
131	{
132	struct fw_file *file;
133	uint8_t *data, cksum = 0;
134	uint8_t *cksum_start;
135
136	file = qemu_fwcfg_find_file(entry->cksum.file);
137	if (!file \|\| !file->addr)
138	return -ENOENT;
139
140	data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
141	cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
142	cksum = table_compute_checksum(cksum_start,
143	le32_to_cpu(entry->cksum.length));
144	*data = cksum;
145
146	return 0;
147	}
148
149	/* This function loads and patches ACPI tables provided by QEMU */
42fd8c19	150	ulong write_acpi_tables(ulong addr)
eece493a MY	151	{
	152	int i, ret = 0;
	153	struct fw_file *file;
	154	struct bios_linker_entry *table_loader;
	155	struct bios_linker_entry *entry;
	156	uint32_t size;
	157
	158	/* make sure fw_list is loaded */
	159	ret = qemu_fwcfg_read_firmware_list();
	160	if (ret) {
	161	printf("error: can't read firmware file list\n");
	162	return addr;
	163	}
	164
	165	file = qemu_fwcfg_find_file("etc/table-loader");
	166	if (!file) {
	167	printf("error: can't find etc/table-loader\n");
	168	return addr;
	169	}
	170
	171	size = be32_to_cpu(file->cfg.size);
	172	if ((size % sizeof(*entry)) != 0) {
	173	printf("error: table-loader maybe corrupted\n");
	174	return addr;
	175	}
	176
	177	table_loader = malloc(size);
	178	if (!table_loader) {
	179	printf("error: no memory for table-loader\n");
	180	return addr;
	181	}
	182
	183	qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
	184	size, table_loader);
	185
	186	for (i = 0; i < (size / sizeof(*entry)); i++) {
	187	entry = table_loader + i;
	188	switch (le32_to_cpu(entry->command)) {
	189	case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
	190	ret = bios_linker_allocate(entry, &addr);
	191	if (ret)
	192	goto out;
	193	break;
	194	case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
	195	ret = bios_linker_add_pointer(entry);
	196	if (ret)
	197	goto out;
	198	break;
	199	case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
	200	ret = bios_linker_add_checksum(entry);
	201	if (ret)
	202	goto out;
	203	break;
	204	default:
	205	break;
	206	}
	207	}
	208
	209	out:
	210	if (ret) {
	211	struct fw_cfg_file_iter iter;
	212	for (file = qemu_fwcfg_file_iter_init(&iter);
	213	!qemu_fwcfg_file_iter_end(&iter);
	214	file = qemu_fwcfg_file_iter_next(&iter)) {
215	if (file->addr) {
216	free((void *)file->addr);
217	file->addr = 0;
218	}
219	}
220	}
221
222	free(table_loader);
223	return addr;
224	}
225	#endif
226
fcf5c041 MY	227	/* Read configuration item using fw_cfg PIO interface */
	228	static void qemu_fwcfg_read_entry_pio(uint16_t entry,
	229	uint32_t size, void *address)
	230	{
2e82e745 MY	231	debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n",
2e82e745 MY	232	entry, size, address);
fcf5c041	233
2e82e745	234	return fwcfg_arch_ops->arch_read_pio(entry, size, address);
fcf5c041 MY	235	}
	236
	237	/* Read configuration item using fw_cfg DMA interface */
	238	static void qemu_fwcfg_read_entry_dma(uint16_t entry,
	239	uint32_t size, void *address)
	240	{
	241	struct fw_cfg_dma_access dma;
	242
	243	dma.length = cpu_to_be32(size);
	244	dma.address = cpu_to_be64((uintptr_t)address);
	245	dma.control = cpu_to_be32(FW_CFG_DMA_READ);
	246
	247	/*
	248	* writting FW_CFG_INVALID will cause read operation to resume at
	249	* last offset, otherwise read will start at offset 0
	250	*/
	251	if (entry != FW_CFG_INVALID)
	252	dma.control \|= cpu_to_be32(FW_CFG_DMA_SELECT \| (entry << 16));
	253
	254	barrier();
	255
2e82e745 MY	256	debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n",
2e82e745 MY	257	entry, size, address, be32_to_cpu(dma.control));
fcf5c041	258
2e82e745	259	fwcfg_arch_ops->arch_read_dma(&dma);
fcf5c041 MY	260	}
	261
	262	bool qemu_fwcfg_present(void)
	263	{
	264	return fwcfg_present;
	265	}
	266
	267	bool qemu_fwcfg_dma_present(void)
	268	{
	269	return fwcfg_dma_present;
	270	}
	271
	272	void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address)
	273	{
	274	if (fwcfg_dma_present)
	275	qemu_fwcfg_read_entry_dma(entry, length, address);
	276	else
	277	qemu_fwcfg_read_entry_pio(entry, length, address);
	278	}
	279
	280	int qemu_fwcfg_online_cpus(void)
	281	{
	282	uint16_t nb_cpus;
	283
	284	if (!fwcfg_present)
	285	return -ENODEV;
	286
	287	qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);
	288
	289	return le16_to_cpu(nb_cpus);
	290	}
	291
	292	int qemu_fwcfg_read_firmware_list(void)
	293	{
	294	int i;
	295	uint32_t count;
	296	struct fw_file *file;
	297	struct list_head *entry;
	298
	299	/* don't read it twice */
	300	if (!list_empty(&fw_list))
	301	return 0;
	302
	303	qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
	304	if (!count)
	305	return 0;
	306
	307	count = be32_to_cpu(count);
	308	for (i = 0; i < count; i++) {
	309	file = malloc(sizeof(*file));
	310	if (!file) {
	311	printf("error: allocating resource\n");
	312	goto err;
	313	}
	314	qemu_fwcfg_read_entry(FW_CFG_INVALID,
	315	sizeof(struct fw_cfg_file), &file->cfg);
	316	file->addr = 0;
	317	list_add_tail(&file->list, &fw_list);
	318	}
	319
	320	return 0;
	321
	322	err:
	323	list_for_each(entry, &fw_list) {
324	file = list_entry(entry, struct fw_file, list);
325	free(file);
326	}
327
328	return -ENOMEM;
329	}
330
331	struct fw_file qemu_fwcfg_find_file(const char name)
332	{
333	struct list_head *entry;
334	struct fw_file *file;
335
336	list_for_each(entry, &fw_list) {
337	file = list_entry(entry, struct fw_file, list);
338	if (!strcmp(file->cfg.name, name))
339	return file;
340	}
341
342	return NULL;
343	}
344
345	struct fw_file qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter iter)
346	{
347	iter->entry = fw_list.next;
348	return list_entry((struct list_head *)iter->entry,
349	struct fw_file, list);
350	}
351
352	struct fw_file qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter iter)
353	{
354	iter->entry = ((struct list_head *)iter->entry)->next;
355	return list_entry((struct list_head *)iter->entry,
356	struct fw_file, list);
357	}
358
359	bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter)
360	{
361	return iter->entry == &fw_list;
362	}
363
2e82e745	364	void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops)
fcf5c041 MY	365	{
	366	uint32_t qemu;
	367	uint32_t dma_enabled;
	368
	369	fwcfg_present = false;
	370	fwcfg_dma_present = false;
2e82e745 MY	371	fwcfg_arch_ops = NULL;
	372
	373	if (!ops \|\| !ops->arch_read_pio \|\| !ops->arch_read_dma)
	374	return;
	375	fwcfg_arch_ops = ops;
fcf5c041 MY	376
	377	qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
	378	if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE)
	379	fwcfg_present = true;
	380
	381	if (fwcfg_present) {
	382	qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
	383	if (dma_enabled & FW_CFG_DMA_ENABLED)
	384	fwcfg_dma_present = true;
	385	}
	386	}