[mirror_ubuntu-bionic-kernel.git] / arch / arm64 / kernel / efi.c

/*
 * Extensible Firmware Interface
 *
 * Based on Extensible Firmware Interface Specification version 2.4
 *
 * Copyright (C) 2013, 2014 Linaro Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/export.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include <asm/cacheflush.h>
#include <asm/efi.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>

struct efi_memory_map memmap;

static efi_runtime_services_t *runtime;

static u64 efi_system_table;

static int uefi_debug __initdata;
static int __init uefi_debug_setup(char *str)
{
	uefi_debug = 1;

	return 0;
}
early_param("uefi_debug", uefi_debug_setup);

static int __init is_normal_ram(efi_memory_desc_t *md)
{
	if (md->attribute & EFI_MEMORY_WB)
		return 1;
	return 0;
}

static void __init efi_setup_idmap(void)
{
	struct memblock_region *r;
	efi_memory_desc_t *md;
	u64 paddr, npages, size;

	for_each_memblock(memory, r)
		create_id_mapping(r->base, r->size, 0);

	/* map runtime io spaces */
	for_each_efi_memory_desc(&memmap, md) {
		if (!(md->attribute & EFI_MEMORY_RUNTIME) || is_normal_ram(md))
			continue;
		paddr = md->phys_addr;
		npages = md->num_pages;
		memrange_efi_to_native(&paddr, &npages);
		size = npages << PAGE_SHIFT;
		create_id_mapping(paddr, size, 1);
	}
}

static int __init uefi_init(void)
{
	efi_char16_t *c16;
	char vendor[100] = "unknown";
	int i, retval;

	efi.systab = early_memremap(efi_system_table,
				    sizeof(efi_system_table_t));
	if (efi.systab == NULL) {
		pr_warn("Unable to map EFI system table.\n");
		return -ENOMEM;
	}

	set_bit(EFI_BOOT, &efi.flags);
	set_bit(EFI_64BIT, &efi.flags);

	/*
	 * Verify the EFI Table
	 */
	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
		pr_err("System table signature incorrect\n");
		return -EINVAL;
	}
	if ((efi.systab->hdr.revision >> 16) < 2)
		pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
			efi.systab->hdr.revision >> 16,
			efi.systab->hdr.revision & 0xffff);

	/* Show what we know for posterity */
	c16 = early_memremap(efi.systab->fw_vendor,
			     sizeof(vendor));
	if (c16) {
		for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
			vendor[i] = c16[i];
		vendor[i] = '\0';
	}

	pr_info("EFI v%u.%.02u by %s\n",
		efi.systab->hdr.revision >> 16,
		efi.systab->hdr.revision & 0xffff, vendor);

	retval = efi_config_init(NULL);
	if (retval == 0)
		set_bit(EFI_CONFIG_TABLES, &efi.flags);

	early_memunmap(c16, sizeof(vendor));
	early_memunmap(efi.systab,  sizeof(efi_system_table_t));

	return retval;
}

static __initdata char memory_type_name[][32] = {
	{"Reserved"},
	{"Loader Code"},
	{"Loader Data"},
	{"Boot Code"},
	{"Boot Data"},
	{"Runtime Code"},
	{"Runtime Data"},
	{"Conventional Memory"},
	{"Unusable Memory"},
	{"ACPI Reclaim Memory"},
	{"ACPI Memory NVS"},
	{"Memory Mapped I/O"},
	{"MMIO Port Space"},
	{"PAL Code"},
};

/*
 * Return true for RAM regions we want to permanently reserve.
 */
static __init int is_reserve_region(efi_memory_desc_t *md)
{
	if (!is_normal_ram(md))
		return 0;

	if (md->attribute & EFI_MEMORY_RUNTIME)
		return 1;

	if (md->type == EFI_ACPI_RECLAIM_MEMORY ||
	    md->type == EFI_RESERVED_TYPE)
		return 1;

	return 0;
}

static __init void reserve_regions(void)
{
	efi_memory_desc_t *md;
	u64 paddr, npages, size;

	if (uefi_debug)
		pr_info("Processing EFI memory map:\n");

	for_each_efi_memory_desc(&memmap, md) {
		paddr = md->phys_addr;
		npages = md->num_pages;

		if (uefi_debug)
			pr_info("  0x%012llx-0x%012llx [%s]",
				paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
				memory_type_name[md->type]);

		memrange_efi_to_native(&paddr, &npages);
		size = npages << PAGE_SHIFT;

		if (is_normal_ram(md))
			early_init_dt_add_memory_arch(paddr, size);

		if (is_reserve_region(md) ||
		    md->type == EFI_BOOT_SERVICES_CODE ||
		    md->type == EFI_BOOT_SERVICES_DATA) {
			memblock_reserve(paddr, size);
			if (uefi_debug)
				pr_cont("*");
		}

		if (uefi_debug)
			pr_cont("\n");
	}

	set_bit(EFI_MEMMAP, &efi.flags);
}


static u64 __init free_one_region(u64 start, u64 end)
{
	u64 size = end - start;

	if (uefi_debug)
		pr_info("  EFI freeing: 0x%012llx-0x%012llx\n",	start, end - 1);

	free_bootmem_late(start, size);
	return size;
}

static u64 __init free_region(u64 start, u64 end)
{
	u64 map_start, map_end, total = 0;

	if (end <= start)
		return total;

	map_start = (u64)memmap.phys_map;
	map_end = PAGE_ALIGN(map_start + (memmap.map_end - memmap.map));
	map_start &= PAGE_MASK;

	if (start < map_end && end > map_start) {
		/* region overlaps UEFI memmap */
		if (start < map_start)
			total += free_one_region(start, map_start);

		if (map_end < end)
			total += free_one_region(map_end, end);
	} else
		total += free_one_region(start, end);

	return total;
}

static void __init free_boot_services(void)
{
	u64 total_freed = 0;
	u64 keep_end, free_start, free_end;
	efi_memory_desc_t *md;

	/*
	 * If kernel uses larger pages than UEFI, we have to be careful
	 * not to inadvertantly free memory we want to keep if there is
	 * overlap at the kernel page size alignment. We do not want to
	 * free is_reserve_region() memory nor the UEFI memmap itself.
	 *
	 * The memory map is sorted, so we keep track of the end of
	 * any previous region we want to keep, remember any region
	 * we want to free and defer freeing it until we encounter
	 * the next region we want to keep. This way, before freeing
	 * it, we can clip it as needed to avoid freeing memory we
	 * want to keep for UEFI.
	 */

	keep_end = 0;
	free_start = 0;

	for_each_efi_memory_desc(&memmap, md) {
		u64 paddr, npages, size;

		if (is_reserve_region(md)) {
			/*
			 * We don't want to free any memory from this region.
			 */
			if (free_start) {
				/* adjust free_end then free region */
				if (free_end > md->phys_addr)
					free_end -= PAGE_SIZE;
				total_freed += free_region(free_start, free_end);
				free_start = 0;
			}
			keep_end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
			continue;
		}

		if (md->type != EFI_BOOT_SERVICES_CODE &&
		    md->type != EFI_BOOT_SERVICES_DATA) {
			/* no need to free this region */
			continue;
		}

		/*
		 * We want to free memory from this region.
		 */
		paddr = md->phys_addr;
		npages = md->num_pages;
		memrange_efi_to_native(&paddr, &npages);
		size = npages << PAGE_SHIFT;

		if (free_start) {
			if (paddr <= free_end)
				free_end = paddr + size;
			else {
				total_freed += free_region(free_start, free_end);
				free_start = paddr;
				free_end = paddr + size;
			}
		} else {
			free_start = paddr;
			free_end = paddr + size;
		}
		if (free_start < keep_end) {
			free_start += PAGE_SIZE;
			if (free_start >= free_end)
				free_start = 0;
		}
	}
	if (free_start)
		total_freed += free_region(free_start, free_end);

	if (total_freed)
		pr_info("Freed 0x%llx bytes of EFI boot services memory",
			total_freed);
}

void __init efi_init(void)
{
	struct efi_fdt_params params;

	/* Grab UEFI information placed in FDT by stub */
	if (!efi_get_fdt_params(&params, uefi_debug))
		return;

	efi_system_table = params.system_table;

	memblock_reserve(params.mmap & PAGE_MASK,
			 PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
	memmap.phys_map = (void *)params.mmap;
	memmap.map = early_memremap(params.mmap, params.mmap_size);
	memmap.map_end = memmap.map + params.mmap_size;
	memmap.desc_size = params.desc_size;
	memmap.desc_version = params.desc_ver;

	if (uefi_init() < 0)
		return;

	reserve_regions();
}

void __init efi_idmap_init(void)
{
	if (!efi_enabled(EFI_BOOT))
		return;

	/* boot time idmap_pg_dir is incomplete, so fill in missing parts */
	efi_setup_idmap();
}

static int __init remap_region(efi_memory_desc_t *md, void **new)
{
	u64 paddr, vaddr, npages, size;

	paddr = md->phys_addr;
	npages = md->num_pages;
	memrange_efi_to_native(&paddr, &npages);
	size = npages << PAGE_SHIFT;

	if (is_normal_ram(md))
		vaddr = (__force u64)ioremap_cache(paddr, size);
	else
		vaddr = (__force u64)ioremap(paddr, size);

	if (!vaddr) {
		pr_err("Unable to remap 0x%llx pages @ %p\n",
		       npages, (void *)paddr);
		return 0;
	}

	/* adjust for any rounding when EFI and system pagesize differs */
	md->virt_addr = vaddr + (md->phys_addr - paddr);

	if (uefi_debug)
		pr_info("  EFI remap 0x%012llx => %p\n",
			md->phys_addr, (void *)md->virt_addr);

	memcpy(*new, md, memmap.desc_size);
	*new += memmap.desc_size;

	return 1;
}

/*
 * Switch UEFI from an identity map to a kernel virtual map
 */
static int __init arm64_enter_virtual_mode(void)
{
	efi_memory_desc_t *md;
	phys_addr_t virtmap_phys;
	void *virtmap, *virt_md;
	efi_status_t status;
	u64 mapsize;
	int count = 0;
	unsigned long flags;

	if (!efi_enabled(EFI_BOOT)) {
		pr_info("EFI services will not be available.\n");
		return -1;
	}

	pr_info("Remapping and enabling EFI services.\n");

	/* replace early memmap mapping with permanent mapping */
	mapsize = memmap.map_end - memmap.map;
	early_memunmap(memmap.map, mapsize);
	memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
						   mapsize);
	memmap.map_end = memmap.map + mapsize;

	efi.memmap = &memmap;

	/* Map the runtime regions */
	virtmap = kmalloc(mapsize, GFP_KERNEL);
	if (!virtmap) {
		pr_err("Failed to allocate EFI virtual memmap\n");
		return -1;
	}
	virtmap_phys = virt_to_phys(virtmap);
	virt_md = virtmap;

	for_each_efi_memory_desc(&memmap, md) {
		if (!(md->attribute & EFI_MEMORY_RUNTIME))
			continue;
		if (!remap_region(md, &virt_md))
			goto err_unmap;
		++count;
	}

	efi.systab = (__force void *)efi_lookup_mapped_addr(efi_system_table);
	if (!efi.systab) {
		/*
		 * If we have no virtual mapping for the System Table at this
		 * point, the memory map doesn't cover the physical offset where
		 * it resides. This means the System Table will be inaccessible
		 * to Runtime Services themselves once the virtual mapping is
		 * installed.
		 */
		pr_err("Failed to remap EFI System Table -- buggy firmware?\n");
		goto err_unmap;
	}
	set_bit(EFI_SYSTEM_TABLES, &efi.flags);

	/*
	 * DMI depends on EFI on arm64, and dmi_scan_machine() needs to be
	 * called early because dmi_id_init(), which is an arch_initcall itself,
	 * depends on dmi_scan_machine() having been called already.
	 */
	dmi_scan_machine();

	local_irq_save(flags);
	cpu_switch_mm(idmap_pg_dir, &init_mm);

	/* Call SetVirtualAddressMap with the physical address of the map */
	runtime = efi.systab->runtime;
	efi.set_virtual_address_map = runtime->set_virtual_address_map;

	status = efi.set_virtual_address_map(count * memmap.desc_size,
					     memmap.desc_size,
					     memmap.desc_version,
					     (efi_memory_desc_t *)virtmap_phys);
	cpu_set_reserved_ttbr0();
	flush_tlb_all();
	local_irq_restore(flags);

	kfree(virtmap);

	free_boot_services();

	if (status != EFI_SUCCESS) {
		pr_err("Failed to set EFI virtual address map! [%lx]\n",
			status);
		return -1;
	}

	/* Set up runtime services function pointers */
	runtime = efi.systab->runtime;
	efi_native_runtime_setup();
	set_bit(EFI_RUNTIME_SERVICES, &efi.flags);

	efi.runtime_version = efi.systab->hdr.revision;

	return 0;

err_unmap:
	/* unmap all mappings that succeeded: there are 'count' of those */
	for (virt_md = virtmap; count--; virt_md += memmap.desc_size) {
		md = virt_md;
		iounmap((__force void __iomem *)md->virt_addr);
	}
	kfree(virtmap);
	return -1;
}
early_initcall(arm64_enter_virtual_mode);
Commit	Line	Data
f84d0275 MS	1	/*
	2	* Extensible Firmware Interface
	3	*
	4	* Based on Extensible Firmware Interface Specification version 2.4
	5	*
	6	* Copyright (C) 2013, 2014 Linaro Ltd.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
668ebd10	14	#include <linux/dmi.h>
f84d0275 MS	15	#include <linux/efi.h>
	16	#include <linux/export.h>
	17	#include <linux/memblock.h>
	18	#include <linux/bootmem.h>
	19	#include <linux/of.h>
	20	#include <linux/of_fdt.h>
	21	#include <linux/sched.h>
	22	#include <linux/slab.h>
	23
	24	#include <asm/cacheflush.h>
	25	#include <asm/efi.h>
	26	#include <asm/tlbflush.h>
	27	#include <asm/mmu_context.h>
	28
	29	struct efi_memory_map memmap;
	30
	31	static efi_runtime_services_t *runtime;
	32
	33	static u64 efi_system_table;
	34
	35	static int uefi_debug __initdata;
	36	static int __init uefi_debug_setup(char *str)
	37	{
	38	uefi_debug = 1;
	39
	40	return 0;
	41	}
	42	early_param("uefi_debug", uefi_debug_setup);
	43
	44	static int __init is_normal_ram(efi_memory_desc_t *md)
	45	{
	46	if (md->attribute & EFI_MEMORY_WB)
	47	return 1;
	48	return 0;
	49	}
	50
	51	static void __init efi_setup_idmap(void)
	52	{
	53	struct memblock_region *r;
	54	efi_memory_desc_t *md;
	55	u64 paddr, npages, size;
	56
	57	for_each_memblock(memory, r)
	58	create_id_mapping(r->base, r->size, 0);
	59
	60	/* map runtime io spaces */
	61	for_each_efi_memory_desc(&memmap, md) {
	62	if (!(md->attribute & EFI_MEMORY_RUNTIME) \|\| is_normal_ram(md))
	63	continue;
	64	paddr = md->phys_addr;
	65	npages = md->num_pages;
	66	memrange_efi_to_native(&paddr, &npages);
	67	size = npages << PAGE_SHIFT;
	68	create_id_mapping(paddr, size, 1);
	69	}
	70	}
	71
	72	static int __init uefi_init(void)
	73	{
	74	efi_char16_t *c16;
	75	char vendor[100] = "unknown";
	76	int i, retval;
	77
	78	efi.systab = early_memremap(efi_system_table,
79	sizeof(efi_system_table_t));
80	if (efi.systab == NULL) {
81	pr_warn("Unable to map EFI system table.\n");
82	return -ENOMEM;
83	}
84
85	set_bit(EFI_BOOT, &efi.flags);
86	set_bit(EFI_64BIT, &efi.flags);
87
88	/*
89	* Verify the EFI Table
90	*/
91	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
92	pr_err("System table signature incorrect\n");
93	return -EINVAL;
94	}
95	if ((efi.systab->hdr.revision >> 16) < 2)
96	pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
97	efi.systab->hdr.revision >> 16,
98	efi.systab->hdr.revision & 0xffff);
99
100	/* Show what we know for posterity */
101	c16 = early_memremap(efi.systab->fw_vendor,
102	sizeof(vendor));
103	if (c16) {
104	for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
105	vendor[i] = c16[i];
106	vendor[i] = '\0';
107	}
108
109	pr_info("EFI v%u.%.02u by %s\n",
110	efi.systab->hdr.revision >> 16,
111	efi.systab->hdr.revision & 0xffff, vendor);
112
113	retval = efi_config_init(NULL);
114	if (retval == 0)
115	set_bit(EFI_CONFIG_TABLES, &efi.flags);
116
117	early_memunmap(c16, sizeof(vendor));
118	early_memunmap(efi.systab, sizeof(efi_system_table_t));
119
120	return retval;
121	}
122
123	static __initdata char memory_type_name[][32] = {
124	{"Reserved"},
125	{"Loader Code"},
126	{"Loader Data"},
127	{"Boot Code"},
128	{"Boot Data"},
129	{"Runtime Code"},
130	{"Runtime Data"},
131	{"Conventional Memory"},
132	{"Unusable Memory"},
133	{"ACPI Reclaim Memory"},
134	{"ACPI Memory NVS"},
135	{"Memory Mapped I/O"},
136	{"MMIO Port Space"},
137	{"PAL Code"},
138	};
139
140	/*
141	* Return true for RAM regions we want to permanently reserve.
142	*/
143	static __init int is_reserve_region(efi_memory_desc_t *md)
144	{
145	if (!is_normal_ram(md))
146	return 0;
147
148	if (md->attribute & EFI_MEMORY_RUNTIME)
149	return 1;
150
151	if (md->type == EFI_ACPI_RECLAIM_MEMORY \|\|
152	md->type == EFI_RESERVED_TYPE)
153	return 1;
154
155	return 0;
156	}
157
158	static __init void reserve_regions(void)
159	{
160	efi_memory_desc_t *md;
161	u64 paddr, npages, size;
162
163	if (uefi_debug)
164	pr_info("Processing EFI memory map:\n");
165
166	for_each_efi_memory_desc(&memmap, md) {
167	paddr = md->phys_addr;
168	npages = md->num_pages;
169
170	if (uefi_debug)
171	pr_info(" 0x%012llx-0x%012llx [%s]",
172	paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
173	memory_type_name[md->type]);
174
175	memrange_efi_to_native(&paddr, &npages);
176	size = npages << PAGE_SHIFT;
177
178	if (is_normal_ram(md))
179	early_init_dt_add_memory_arch(paddr, size);
180
181	if (is_reserve_region(md) \|\|
182	md->type == EFI_BOOT_SERVICES_CODE \|\|
183	md->type == EFI_BOOT_SERVICES_DATA) {
184	memblock_reserve(paddr, size);
185	if (uefi_debug)
186	pr_cont("*");
187	}
188
189	if (uefi_debug)
190	pr_cont("\n");
191	}
86c8b27a LL	192
86c8b27a LL	193	set_bit(EFI_MEMMAP, &efi.flags);
f84d0275 MS	194	}
	195
	196
	197	static u64 __init free_one_region(u64 start, u64 end)
	198	{
	199	u64 size = end - start;
	200
	201	if (uefi_debug)
	202	pr_info(" EFI freeing: 0x%012llx-0x%012llx\n", start, end - 1);
	203
	204	free_bootmem_late(start, size);
	205	return size;
	206	}
	207
	208	static u64 __init free_region(u64 start, u64 end)
	209	{
	210	u64 map_start, map_end, total = 0;
	211
	212	if (end <= start)
	213	return total;
	214
	215	map_start = (u64)memmap.phys_map;
	216	map_end = PAGE_ALIGN(map_start + (memmap.map_end - memmap.map));
	217	map_start &= PAGE_MASK;
	218
	219	if (start < map_end && end > map_start) {
	220	/* region overlaps UEFI memmap */
	221	if (start < map_start)
	222	total += free_one_region(start, map_start);
	223
	224	if (map_end < end)
	225	total += free_one_region(map_end, end);
	226	} else
	227	total += free_one_region(start, end);
	228
	229	return total;
	230	}
	231
	232	static void __init free_boot_services(void)
	233	{
	234	u64 total_freed = 0;
	235	u64 keep_end, free_start, free_end;
	236	efi_memory_desc_t *md;
	237
	238	/*
	239	* If kernel uses larger pages than UEFI, we have to be careful
	240	* not to inadvertantly free memory we want to keep if there is
	241	* overlap at the kernel page size alignment. We do not want to
	242	* free is_reserve_region() memory nor the UEFI memmap itself.
	243	*
	244	* The memory map is sorted, so we keep track of the end of
	245	* any previous region we want to keep, remember any region
	246	* we want to free and defer freeing it until we encounter
	247	* the next region we want to keep. This way, before freeing
	248	* it, we can clip it as needed to avoid freeing memory we
	249	* want to keep for UEFI.
	250	*/
	251
	252	keep_end = 0;
	253	free_start = 0;
	254
	255	for_each_efi_memory_desc(&memmap, md) {
	256	u64 paddr, npages, size;
	257
258	if (is_reserve_region(md)) {
259	/*
260	* We don't want to free any memory from this region.
261	*/
262	if (free_start) {
263	/* adjust free_end then free region */
264	if (free_end > md->phys_addr)
265	free_end -= PAGE_SIZE;
266	total_freed += free_region(free_start, free_end);
267	free_start = 0;
268	}
269	keep_end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
270	continue;
271	}
272
273	if (md->type != EFI_BOOT_SERVICES_CODE &&
274	md->type != EFI_BOOT_SERVICES_DATA) {
275	/* no need to free this region */
276	continue;
277	}
278
279	/*
280	* We want to free memory from this region.
281	*/
282	paddr = md->phys_addr;
283	npages = md->num_pages;
284	memrange_efi_to_native(&paddr, &npages);
285	size = npages << PAGE_SHIFT;
286
287	if (free_start) {
288	if (paddr <= free_end)
289	free_end = paddr + size;
290	else {
291	total_freed += free_region(free_start, free_end);
292	free_start = paddr;
293	free_end = paddr + size;
294	}
295	} else {
296	free_start = paddr;
297	free_end = paddr + size;
298	}
299	if (free_start < keep_end) {
300	free_start += PAGE_SIZE;
301	if (free_start >= free_end)
302	free_start = 0;
303	}
304	}
305	if (free_start)
306	total_freed += free_region(free_start, free_end);
307
308	if (total_freed)
309	pr_info("Freed 0x%llx bytes of EFI boot services memory",
310	total_freed);
311	}
312
313	void __init efi_init(void)
314	{
315	struct efi_fdt_params params;
316
317	/* Grab UEFI information placed in FDT by stub */
318	if (!efi_get_fdt_params(&params, uefi_debug))
319	return;
320
321	efi_system_table = params.system_table;
322
323	memblock_reserve(params.mmap & PAGE_MASK,
324	PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
325	memmap.phys_map = (void *)params.mmap;
326	memmap.map = early_memremap(params.mmap, params.mmap_size);
327	memmap.map_end = memmap.map + params.mmap_size;
328	memmap.desc_size = params.desc_size;
329	memmap.desc_version = params.desc_ver;
330
331	if (uefi_init() < 0)
332	return;
333
334	reserve_regions();
335	}
336
337	void __init efi_idmap_init(void)
338	{
74bcc249 LL	339	if (!efi_enabled(EFI_BOOT))
	340	return;
	341
f84d0275 MS	342	/* boot time idmap_pg_dir is incomplete, so fill in missing parts */
	343	efi_setup_idmap();
	344	}
	345
	346	static int __init remap_region(efi_memory_desc_t md, void *new)
	347	{
	348	u64 paddr, vaddr, npages, size;
	349
	350	paddr = md->phys_addr;
	351	npages = md->num_pages;
	352	memrange_efi_to_native(&paddr, &npages);
	353	size = npages << PAGE_SHIFT;
	354
	355	if (is_normal_ram(md))
	356	vaddr = (__force u64)ioremap_cache(paddr, size);
	357	else
	358	vaddr = (__force u64)ioremap(paddr, size);
	359
	360	if (!vaddr) {
	361	pr_err("Unable to remap 0x%llx pages @ %p\n",
	362	npages, (void *)paddr);
	363	return 0;
	364	}
	365
	366	/* adjust for any rounding when EFI and system pagesize differs */
	367	md->virt_addr = vaddr + (md->phys_addr - paddr);
	368
	369	if (uefi_debug)
	370	pr_info(" EFI remap 0x%012llx => %p\n",
	371	md->phys_addr, (void *)md->virt_addr);
	372
	373	memcpy(*new, md, memmap.desc_size);
	374	*new += memmap.desc_size;
	375
	376	return 1;
	377	}
	378
	379	/*
	380	* Switch UEFI from an identity map to a kernel virtual map
	381	*/
	382	static int __init arm64_enter_virtual_mode(void)
	383	{
	384	efi_memory_desc_t *md;
	385	phys_addr_t virtmap_phys;
	386	void virtmap, virt_md;
	387	efi_status_t status;
	388	u64 mapsize;
	389	int count = 0;
	390	unsigned long flags;
	391
	392	if (!efi_enabled(EFI_BOOT)) {
	393	pr_info("EFI services will not be available.\n");
	394	return -1;
	395	}
	396
	397	pr_info("Remapping and enabling EFI services.\n");
	398
	399	/* replace early memmap mapping with permanent mapping */
	400	mapsize = memmap.map_end - memmap.map;
	401	early_memunmap(memmap.map, mapsize);
	402	memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
	403	mapsize);
	404	memmap.map_end = memmap.map + mapsize;
	405
406	efi.memmap = &memmap;
407
408	/* Map the runtime regions */
409	virtmap = kmalloc(mapsize, GFP_KERNEL);
410	if (!virtmap) {
411	pr_err("Failed to allocate EFI virtual memmap\n");
412	return -1;
413	}
414	virtmap_phys = virt_to_phys(virtmap);
415	virt_md = virtmap;
416
417	for_each_efi_memory_desc(&memmap, md) {
418	if (!(md->attribute & EFI_MEMORY_RUNTIME))
419	continue;
99a5603e AB	420	if (!remap_region(md, &virt_md))
	421	goto err_unmap;
	422	++count;
f84d0275 MS	423	}
	424
	425	efi.systab = (__force void *)efi_lookup_mapped_addr(efi_system_table);
99a5603e AB	426	if (!efi.systab) {
	427	/*
	428	* If we have no virtual mapping for the System Table at this
	429	* point, the memory map doesn't cover the physical offset where
	430	* it resides. This means the System Table will be inaccessible
	431	* to Runtime Services themselves once the virtual mapping is
	432	* installed.
	433	*/
	434	pr_err("Failed to remap EFI System Table -- buggy firmware?\n");
	435	goto err_unmap;
	436	}
	437	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
f84d0275	438
668ebd10 YL	439	/*
	440	* DMI depends on EFI on arm64, and dmi_scan_machine() needs to be
	441	* called early because dmi_id_init(), which is an arch_initcall itself,
	442	* depends on dmi_scan_machine() having been called already.
	443	*/
	444	dmi_scan_machine();
	445
f84d0275 MS	446	local_irq_save(flags);
	447	cpu_switch_mm(idmap_pg_dir, &init_mm);
	448
	449	/* Call SetVirtualAddressMap with the physical address of the map */
	450	runtime = efi.systab->runtime;
	451	efi.set_virtual_address_map = runtime->set_virtual_address_map;
	452
	453	status = efi.set_virtual_address_map(count * memmap.desc_size,
	454	memmap.desc_size,
	455	memmap.desc_version,
	456	(efi_memory_desc_t *)virtmap_phys);
	457	cpu_set_reserved_ttbr0();
	458	flush_tlb_all();
	459	local_irq_restore(flags);
	460
	461	kfree(virtmap);
	462
	463	free_boot_services();
	464
	465	if (status != EFI_SUCCESS) {
	466	pr_err("Failed to set EFI virtual address map! [%lx]\n",
	467	status);
	468	return -1;
	469	}
	470
	471	/* Set up runtime services function pointers */
	472	runtime = efi.systab->runtime;
e15dd494	473	efi_native_runtime_setup();
f84d0275 MS	474	set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
f84d0275 MS	475
6a7519e8 SP	476	efi.runtime_version = efi.systab->hdr.revision;
6a7519e8 SP	477
f84d0275	478	return 0;
99a5603e AB	479
	480	err_unmap:
	481	/* unmap all mappings that succeeded: there are 'count' of those */
	482	for (virt_md = virtmap; count--; virt_md += memmap.desc_size) {
	483	md = virt_md;
	484	iounmap((__force void __iomem *)md->virt_addr);
	485	}
	486	kfree(virtmap);
	487	return -1;
f84d0275 MS	488	}
f84d0275 MS	489	early_initcall(arm64_enter_virtual_mode);