[deliverable/linux.git] / arch / x86 / platform / efi / efi_64.c

/*
 * x86_64 specific EFI support functions
 * Based on Extensible Firmware Interface Specification version 1.0
 *
 * Copyright (C) 2005-2008 Intel Co.
 *	Fenghua Yu <fenghua.yu@intel.com>
 *	Bibo Mao <bibo.mao@intel.com>
 *	Chandramouli Narayanan <mouli@linux.intel.com>
 *	Huang Ying <ying.huang@intel.com>
 *
 * Code to convert EFI to E820 map has been implemented in elilo bootloader
 * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
 * is setup appropriately for EFI runtime code.
 * - mouli 06/14/2007.
 *
 */

#define pr_fmt(fmt) "efi: " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/efi.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/reboot.h>
#include <linux/slab.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/e820.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/proto.h>
#include <asm/efi.h>
#include <asm/cacheflush.h>
#include <asm/fixmap.h>
#include <asm/realmode.h>
#include <asm/time.h>
#include <asm/pgalloc.h>

/*
 * We allocate runtime services regions bottom-up, starting from -4G, i.e.
 * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
 */
static u64 efi_va = EFI_VA_START;

struct efi_scratch efi_scratch;

static void __init early_code_mapping_set_exec(int executable)
{
	efi_memory_desc_t *md;

	if (!(__supported_pte_mask & _PAGE_NX))
		return;

	/* Make EFI service code area executable */
	for_each_efi_memory_desc(md) {
		if (md->type == EFI_RUNTIME_SERVICES_CODE ||
		    md->type == EFI_BOOT_SERVICES_CODE)
			efi_set_executable(md, executable);
	}
}

pgd_t * __init efi_call_phys_prolog(void)
{
	unsigned long vaddress;
	pgd_t *save_pgd;

	int pgd;
	int n_pgds;

	if (!efi_enabled(EFI_OLD_MEMMAP)) {
		save_pgd = (pgd_t *)read_cr3();
		write_cr3((unsigned long)efi_scratch.efi_pgt);
		goto out;
	}

	early_code_mapping_set_exec(1);

	n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
	save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);

	for (pgd = 0; pgd < n_pgds; pgd++) {
		save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE);
		vaddress = (unsigned long)__va(pgd * PGDIR_SIZE);
		set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
	}
out:
	__flush_tlb_all();

	return save_pgd;
}

void __init efi_call_phys_epilog(pgd_t *save_pgd)
{
	/*
	 * After the lock is released, the original page table is restored.
	 */
	int pgd_idx;
	int nr_pgds;

	if (!efi_enabled(EFI_OLD_MEMMAP)) {
		write_cr3((unsigned long)save_pgd);
		__flush_tlb_all();
		return;
	}

	nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);

	for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++)
		set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);

	kfree(save_pgd);

	__flush_tlb_all();
	early_code_mapping_set_exec(0);
}

static pgd_t *efi_pgd;

/*
 * We need our own copy of the higher levels of the page tables
 * because we want to avoid inserting EFI region mappings (EFI_VA_END
 * to EFI_VA_START) into the standard kernel page tables. Everything
 * else can be shared, see efi_sync_low_kernel_mappings().
 */
int __init efi_alloc_page_tables(void)
{
	pgd_t *pgd;
	pud_t *pud;
	gfp_t gfp_mask;

	if (efi_enabled(EFI_OLD_MEMMAP))
		return 0;

	gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO;
	efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
	if (!efi_pgd)
		return -ENOMEM;

	pgd = efi_pgd + pgd_index(EFI_VA_END);

	pud = pud_alloc_one(NULL, 0);
	if (!pud) {
		free_page((unsigned long)efi_pgd);
		return -ENOMEM;
	}

	pgd_populate(NULL, pgd, pud);

	return 0;
}

/*
 * Add low kernel mappings for passing arguments to EFI functions.
 */
void efi_sync_low_kernel_mappings(void)
{
	unsigned num_entries;
	pgd_t *pgd_k, *pgd_efi;
	pud_t *pud_k, *pud_efi;

	if (efi_enabled(EFI_OLD_MEMMAP))
		return;

	/*
	 * We can share all PGD entries apart from the one entry that
	 * covers the EFI runtime mapping space.
	 *
	 * Make sure the EFI runtime region mappings are guaranteed to
	 * only span a single PGD entry and that the entry also maps
	 * other important kernel regions.
	 */
	BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
	BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
			(EFI_VA_END & PGDIR_MASK));

	pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
	pgd_k = pgd_offset_k(PAGE_OFFSET);

	num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
	memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);

	/*
	 * We share all the PUD entries apart from those that map the
	 * EFI regions. Copy around them.
	 */
	BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
	BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);

	pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
	pud_efi = pud_offset(pgd_efi, 0);

	pgd_k = pgd_offset_k(EFI_VA_END);
	pud_k = pud_offset(pgd_k, 0);

	num_entries = pud_index(EFI_VA_END);
	memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);

	pud_efi = pud_offset(pgd_efi, EFI_VA_START);
	pud_k = pud_offset(pgd_k, EFI_VA_START);

	num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
	memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
}

int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
	unsigned long pfn, text;
	efi_memory_desc_t *md;
	struct page *page;
	unsigned npages;
	pgd_t *pgd;

	if (efi_enabled(EFI_OLD_MEMMAP))
		return 0;

	efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd);
	pgd = efi_pgd;

	/*
	 * It can happen that the physical address of new_memmap lands in memory
	 * which is not mapped in the EFI page table. Therefore we need to go
	 * and ident-map those pages containing the map before calling
	 * phys_efi_set_virtual_address_map().
	 */
	pfn = pa_memmap >> PAGE_SHIFT;
	if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX | _PAGE_RW)) {
		pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
		return 1;
	}

	efi_scratch.use_pgd = true;

	/*
	 * When making calls to the firmware everything needs to be 1:1
	 * mapped and addressable with 32-bit pointers. Map the kernel
	 * text and allocate a new stack because we can't rely on the
	 * stack pointer being < 4GB.
	 */
	if (!IS_ENABLED(CONFIG_EFI_MIXED))
		return 0;

	/*
	 * Map all of RAM so that we can access arguments in the 1:1
	 * mapping when making EFI runtime calls.
	 */
	for_each_efi_memory_desc(md) {
		if (md->type != EFI_CONVENTIONAL_MEMORY &&
		    md->type != EFI_LOADER_DATA &&
		    md->type != EFI_LOADER_CODE)
			continue;

		pfn = md->phys_addr >> PAGE_SHIFT;
		npages = md->num_pages;

		if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) {
			pr_err("Failed to map 1:1 memory\n");
			return 1;
		}
	}

	page = alloc_page(GFP_KERNEL|__GFP_DMA32);
	if (!page)
		panic("Unable to allocate EFI runtime stack < 4GB\n");

	efi_scratch.phys_stack = virt_to_phys(page_address(page));
	efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */

	npages = (_etext - _text) >> PAGE_SHIFT;
	text = __pa(_text);
	pfn = text >> PAGE_SHIFT;

	if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) {
		pr_err("Failed to map kernel text 1:1\n");
		return 1;
	}

	return 0;
}

static void __init __map_region(efi_memory_desc_t *md, u64 va)
{
	unsigned long flags = _PAGE_RW;
	unsigned long pfn;
	pgd_t *pgd = efi_pgd;

	if (!(md->attribute & EFI_MEMORY_WB))
		flags |= _PAGE_PCD;

	pfn = md->phys_addr >> PAGE_SHIFT;
	if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
		pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
			   md->phys_addr, va);
}

void __init efi_map_region(efi_memory_desc_t *md)
{
	unsigned long size = md->num_pages << PAGE_SHIFT;
	u64 pa = md->phys_addr;

	if (efi_enabled(EFI_OLD_MEMMAP))
		return old_map_region(md);

	/*
	 * Make sure the 1:1 mappings are present as a catch-all for b0rked
	 * firmware which doesn't update all internal pointers after switching
	 * to virtual mode and would otherwise crap on us.
	 */
	__map_region(md, md->phys_addr);

	/*
	 * Enforce the 1:1 mapping as the default virtual address when
	 * booting in EFI mixed mode, because even though we may be
	 * running a 64-bit kernel, the firmware may only be 32-bit.
	 */
	if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
		md->virt_addr = md->phys_addr;
		return;
	}

	efi_va -= size;

	/* Is PA 2M-aligned? */
	if (!(pa & (PMD_SIZE - 1))) {
		efi_va &= PMD_MASK;
	} else {
		u64 pa_offset = pa & (PMD_SIZE - 1);
		u64 prev_va = efi_va;

		/* get us the same offset within this 2M page */
		efi_va = (efi_va & PMD_MASK) + pa_offset;

		if (efi_va > prev_va)
			efi_va -= PMD_SIZE;
	}

	if (efi_va < EFI_VA_END) {
		pr_warn(FW_WARN "VA address range overflow!\n");
		return;
	}

	/* Do the VA map */
	__map_region(md, efi_va);
	md->virt_addr = efi_va;
}

/*
 * kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
 * md->virt_addr is the original virtual address which had been mapped in kexec
 * 1st kernel.
 */
void __init efi_map_region_fixed(efi_memory_desc_t *md)
{
	__map_region(md, md->virt_addr);
}

void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
				 u32 type, u64 attribute)
{
	unsigned long last_map_pfn;

	if (type == EFI_MEMORY_MAPPED_IO)
		return ioremap(phys_addr, size);

	last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
	if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
		unsigned long top = last_map_pfn << PAGE_SHIFT;
		efi_ioremap(top, size - (top - phys_addr), type, attribute);
	}

	if (!(attribute & EFI_MEMORY_WB))
		efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);

	return (void __iomem *)__va(phys_addr);
}

void __init parse_efi_setup(u64 phys_addr, u32 data_len)
{
	efi_setup = phys_addr + sizeof(struct setup_data);
}

void __init efi_runtime_update_mappings(void)
{
	unsigned long pfn;
	pgd_t *pgd = efi_pgd;
	efi_memory_desc_t *md;

	if (efi_enabled(EFI_OLD_MEMMAP)) {
		if (__supported_pte_mask & _PAGE_NX)
			runtime_code_page_mkexec();
		return;
	}

	if (!efi_enabled(EFI_NX_PE_DATA))
		return;

	for_each_efi_memory_desc(md) {
		unsigned long pf = 0;

		if (!(md->attribute & EFI_MEMORY_RUNTIME))
			continue;

		if (!(md->attribute & EFI_MEMORY_WB))
			pf |= _PAGE_PCD;

		if ((md->attribute & EFI_MEMORY_XP) ||
			(md->type == EFI_RUNTIME_SERVICES_DATA))
			pf |= _PAGE_NX;

		if (!(md->attribute & EFI_MEMORY_RO) &&
			(md->type != EFI_RUNTIME_SERVICES_CODE))
			pf |= _PAGE_RW;

		/* Update the 1:1 mapping */
		pfn = md->phys_addr >> PAGE_SHIFT;
		if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf))
			pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
				   md->phys_addr, md->virt_addr);

		if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf))
			pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
				   md->phys_addr, md->virt_addr);
	}
}

void __init efi_dump_pagetable(void)
{
#ifdef CONFIG_EFI_PGT_DUMP
	ptdump_walk_pgd_level(NULL, efi_pgd);
#endif
}

#ifdef CONFIG_EFI_MIXED
extern efi_status_t efi64_thunk(u32, ...);

#define runtime_service32(func)						 \
({									 \
	u32 table = (u32)(unsigned long)efi.systab;			 \
	u32 *rt, *___f;							 \
									 \
	rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime));	 \
	___f = (u32 *)(*rt + offsetof(efi_runtime_services_32_t, func)); \
	*___f;								 \
})

/*
 * Switch to the EFI page tables early so that we can access the 1:1
 * runtime services mappings which are not mapped in any other page
 * tables. This function must be called before runtime_service32().
 *
 * Also, disable interrupts because the IDT points to 64-bit handlers,
 * which aren't going to function correctly when we switch to 32-bit.
 */
#define efi_thunk(f, ...)						\
({									\
	efi_status_t __s;						\
	unsigned long __flags;						\
	u32 __func;							\
									\
	local_irq_save(__flags);					\
	arch_efi_call_virt_setup();					\
									\
	__func = runtime_service32(f);					\
	__s = efi64_thunk(__func, __VA_ARGS__);				\
									\
	arch_efi_call_virt_teardown();					\
	local_irq_restore(__flags);					\
									\
	__s;								\
})

efi_status_t efi_thunk_set_virtual_address_map(
	void *phys_set_virtual_address_map,
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map)
{
	efi_status_t status;
	unsigned long flags;
	u32 func;

	efi_sync_low_kernel_mappings();
	local_irq_save(flags);

	efi_scratch.prev_cr3 = read_cr3();
	write_cr3((unsigned long)efi_scratch.efi_pgt);
	__flush_tlb_all();

	func = (u32)(unsigned long)phys_set_virtual_address_map;
	status = efi64_thunk(func, memory_map_size, descriptor_size,
			     descriptor_version, virtual_map);

	write_cr3(efi_scratch.prev_cr3);
	__flush_tlb_all();
	local_irq_restore(flags);

	return status;
}

static efi_status_t efi_thunk_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
	efi_status_t status;
	u32 phys_tm, phys_tc;

	spin_lock(&rtc_lock);

	phys_tm = virt_to_phys(tm);
	phys_tc = virt_to_phys(tc);

	status = efi_thunk(get_time, phys_tm, phys_tc);

	spin_unlock(&rtc_lock);

	return status;
}

static efi_status_t efi_thunk_set_time(efi_time_t *tm)
{
	efi_status_t status;
	u32 phys_tm;

	spin_lock(&rtc_lock);

	phys_tm = virt_to_phys(tm);

	status = efi_thunk(set_time, phys_tm);

	spin_unlock(&rtc_lock);

	return status;
}

static efi_status_t
efi_thunk_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
			  efi_time_t *tm)
{
	efi_status_t status;
	u32 phys_enabled, phys_pending, phys_tm;

	spin_lock(&rtc_lock);

	phys_enabled = virt_to_phys(enabled);
	phys_pending = virt_to_phys(pending);
	phys_tm = virt_to_phys(tm);

	status = efi_thunk(get_wakeup_time, phys_enabled,
			     phys_pending, phys_tm);

	spin_unlock(&rtc_lock);

	return status;
}

static efi_status_t
efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
	efi_status_t status;
	u32 phys_tm;

	spin_lock(&rtc_lock);

	phys_tm = virt_to_phys(tm);

	status = efi_thunk(set_wakeup_time, enabled, phys_tm);

	spin_unlock(&rtc_lock);

	return status;
}


static efi_status_t
efi_thunk_get_variable(efi_char16_t *name, efi_guid_t *vendor,
		       u32 *attr, unsigned long *data_size, void *data)
{
	efi_status_t status;
	u32 phys_name, phys_vendor, phys_attr;
	u32 phys_data_size, phys_data;

	phys_data_size = virt_to_phys(data_size);
	phys_vendor = virt_to_phys(vendor);
	phys_name = virt_to_phys(name);
	phys_attr = virt_to_phys(attr);
	phys_data = virt_to_phys(data);

	status = efi_thunk(get_variable, phys_name, phys_vendor,
			   phys_attr, phys_data_size, phys_data);

	return status;
}

static efi_status_t
efi_thunk_set_variable(efi_char16_t *name, efi_guid_t *vendor,
		       u32 attr, unsigned long data_size, void *data)
{
	u32 phys_name, phys_vendor, phys_data;
	efi_status_t status;

	phys_name = virt_to_phys(name);
	phys_vendor = virt_to_phys(vendor);
	phys_data = virt_to_phys(data);

	/* If data_size is > sizeof(u32) we've got problems */
	status = efi_thunk(set_variable, phys_name, phys_vendor,
			   attr, data_size, phys_data);

	return status;
}

static efi_status_t
efi_thunk_get_next_variable(unsigned long *name_size,
			    efi_char16_t *name,
			    efi_guid_t *vendor)
{
	efi_status_t status;
	u32 phys_name_size, phys_name, phys_vendor;

	phys_name_size = virt_to_phys(name_size);
	phys_vendor = virt_to_phys(vendor);
	phys_name = virt_to_phys(name);

	status = efi_thunk(get_next_variable, phys_name_size,
			   phys_name, phys_vendor);

	return status;
}

static efi_status_t
efi_thunk_get_next_high_mono_count(u32 *count)
{
	efi_status_t status;
	u32 phys_count;

	phys_count = virt_to_phys(count);
	status = efi_thunk(get_next_high_mono_count, phys_count);

	return status;
}

static void
efi_thunk_reset_system(int reset_type, efi_status_t status,
		       unsigned long data_size, efi_char16_t *data)
{
	u32 phys_data;

	phys_data = virt_to_phys(data);

	efi_thunk(reset_system, reset_type, status, data_size, phys_data);
}

static efi_status_t
efi_thunk_update_capsule(efi_capsule_header_t **capsules,
			 unsigned long count, unsigned long sg_list)
{
	/*
	 * To properly support this function we would need to repackage
	 * 'capsules' because the firmware doesn't understand 64-bit
	 * pointers.
	 */
	return EFI_UNSUPPORTED;
}

static efi_status_t
efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
			      u64 *remaining_space,
			      u64 *max_variable_size)
{
	efi_status_t status;
	u32 phys_storage, phys_remaining, phys_max;

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	phys_storage = virt_to_phys(storage_space);
	phys_remaining = virt_to_phys(remaining_space);
	phys_max = virt_to_phys(max_variable_size);

	status = efi_thunk(query_variable_info, attr, phys_storage,
			   phys_remaining, phys_max);

	return status;
}

static efi_status_t
efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
			     unsigned long count, u64 *max_size,
			     int *reset_type)
{
	/*
	 * To properly support this function we would need to repackage
	 * 'capsules' because the firmware doesn't understand 64-bit
	 * pointers.
	 */
	return EFI_UNSUPPORTED;
}

void efi_thunk_runtime_setup(void)
{
	efi.get_time = efi_thunk_get_time;
	efi.set_time = efi_thunk_set_time;
	efi.get_wakeup_time = efi_thunk_get_wakeup_time;
	efi.set_wakeup_time = efi_thunk_set_wakeup_time;
	efi.get_variable = efi_thunk_get_variable;
	efi.get_next_variable = efi_thunk_get_next_variable;
	efi.set_variable = efi_thunk_set_variable;
	efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
	efi.reset_system = efi_thunk_reset_system;
	efi.query_variable_info = efi_thunk_query_variable_info;
	efi.update_capsule = efi_thunk_update_capsule;
	efi.query_capsule_caps = efi_thunk_query_capsule_caps;
}
#endif /* CONFIG_EFI_MIXED */
Commit	Line	Data
5b83683f HY	1	/*
	2	* x86_64 specific EFI support functions
	3	* Based on Extensible Firmware Interface Specification version 1.0
	4	*
	5	* Copyright (C) 2005-2008 Intel Co.
	6	* Fenghua Yu <fenghua.yu@intel.com>
	7	* Bibo Mao <bibo.mao@intel.com>
	8	* Chandramouli Narayanan <mouli@linux.intel.com>
	9	* Huang Ying <ying.huang@intel.com>
	10	*
	11	* Code to convert EFI to E820 map has been implemented in elilo bootloader
	12	* based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
	13	* is setup appropriately for EFI runtime code.
	14	* - mouli 06/14/2007.
	15	*
	16	*/
	17
26d7f65f MF	18	#define pr_fmt(fmt) "efi: " fmt
26d7f65f MF	19
5b83683f HY	20	#include <linux/kernel.h>
	21	#include <linux/init.h>
	22	#include <linux/mm.h>
	23	#include <linux/types.h>
	24	#include <linux/spinlock.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/ioport.h>
cc3ae7b0	27	#include <linux/init.h>
5b83683f HY	28	#include <linux/efi.h>
	29	#include <linux/uaccess.h>
	30	#include <linux/io.h>
	31	#include <linux/reboot.h>
0d01ff25	32	#include <linux/slab.h>
5b83683f HY	33
	34	#include <asm/setup.h>
	35	#include <asm/page.h>
	36	#include <asm/e820.h>
	37	#include <asm/pgtable.h>
	38	#include <asm/tlbflush.h>
5b83683f HY	39	#include <asm/proto.h>
5b83683f HY	40	#include <asm/efi.h>
4de0d4a6	41	#include <asm/cacheflush.h>
3819cd48	42	#include <asm/fixmap.h>
d2f7cbe7	43	#include <asm/realmode.h>
4f9dbcfc	44	#include <asm/time.h>
67a9108e	45	#include <asm/pgalloc.h>
5b83683f	46
d2f7cbe7 BP	47	/*
	48	* We allocate runtime services regions bottom-up, starting from -4G, i.e.
	49	* 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
	50	*/
8266e31e	51	static u64 efi_va = EFI_VA_START;
d2f7cbe7	52
c9f2a9a6	53	struct efi_scratch efi_scratch;
d2f7cbe7	54
9cd2b07c	55	static void __init early_code_mapping_set_exec(int executable)
5b83683f HY	56	{
5b83683f HY	57	efi_memory_desc_t *md;
5b83683f	58
a2172e25 HY	59	if (!(__supported_pte_mask & _PAGE_NX))
	60	return;
	61
916f676f	62	/* Make EFI service code area executable */
78ce248f	63	for_each_efi_memory_desc(md) {
916f676f MG	64	if (md->type == EFI_RUNTIME_SERVICES_CODE \|\|
916f676f MG	65	md->type == EFI_BOOT_SERVICES_CODE)
9cd2b07c	66	efi_set_executable(md, executable);
5b83683f HY	67	}
	68	}
	69
744937b0	70	pgd_t * __init efi_call_phys_prolog(void)
5b83683f HY	71	{
5b83683f HY	72	unsigned long vaddress;
744937b0 IM	73	pgd_t *save_pgd;
744937b0 IM	74
b8f2c21d NZ	75	int pgd;
b8f2c21d NZ	76	int n_pgds;
5b83683f	77
c9f2a9a6 MF	78	if (!efi_enabled(EFI_OLD_MEMMAP)) {
	79	save_pgd = (pgd_t *)read_cr3();
	80	write_cr3((unsigned long)efi_scratch.efi_pgt);
	81	goto out;
	82	}
d2f7cbe7	83
9cd2b07c	84	early_code_mapping_set_exec(1);
b8f2c21d NZ	85
	86	n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
	87	save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
	88
	89	for (pgd = 0; pgd < n_pgds; pgd++) {
	90	save_pgd[pgd] = pgd_offset_k(pgd PGDIR_SIZE);
	91	vaddress = (unsigned long)__va(pgd * PGDIR_SIZE);
	92	set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
	93	}
c9f2a9a6	94	out:
5b83683f	95	__flush_tlb_all();
744937b0 IM	96
744937b0 IM	97	return save_pgd;
5b83683f HY	98	}
5b83683f HY	99
744937b0	100	void __init efi_call_phys_epilog(pgd_t *save_pgd)
5b83683f HY	101	{
	102	/*
	103	* After the lock is released, the original page table is restored.
	104	*/
744937b0 IM	105	int pgd_idx;
744937b0 IM	106	int nr_pgds;
d2f7cbe7	107
c9f2a9a6 MF	108	if (!efi_enabled(EFI_OLD_MEMMAP)) {
	109	write_cr3((unsigned long)save_pgd);
	110	__flush_tlb_all();
d2f7cbe7	111	return;
c9f2a9a6	112	}
d2f7cbe7	113
744937b0 IM	114	nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
	115
	116	for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++)
	117	set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
	118
b8f2c21d	119	kfree(save_pgd);
744937b0	120
5b83683f	121	__flush_tlb_all();
9cd2b07c	122	early_code_mapping_set_exec(0);
5b83683f	123	}
e1ad783b	124
67a9108e MF	125	static pgd_t *efi_pgd;
	126
	127	/*
	128	* We need our own copy of the higher levels of the page tables
	129	* because we want to avoid inserting EFI region mappings (EFI_VA_END
	130	* to EFI_VA_START) into the standard kernel page tables. Everything
	131	* else can be shared, see efi_sync_low_kernel_mappings().
	132	*/
	133	int __init efi_alloc_page_tables(void)
	134	{
	135	pgd_t *pgd;
	136	pud_t *pud;
	137	gfp_t gfp_mask;
	138
	139	if (efi_enabled(EFI_OLD_MEMMAP))
	140	return 0;
	141
f58f230a	142	gfp_mask = GFP_KERNEL \| __GFP_NOTRACK \| __GFP_ZERO;
67a9108e MF	143	efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
	144	if (!efi_pgd)
	145	return -ENOMEM;
	146
	147	pgd = efi_pgd + pgd_index(EFI_VA_END);
	148
	149	pud = pud_alloc_one(NULL, 0);
	150	if (!pud) {
	151	free_page((unsigned long)efi_pgd);
	152	return -ENOMEM;
	153	}
	154
	155	pgd_populate(NULL, pgd, pud);
	156
	157	return 0;
	158	}
	159
d2f7cbe7 BP	160	/*
	161	* Add low kernel mappings for passing arguments to EFI functions.
	162	*/
	163	void efi_sync_low_kernel_mappings(void)
	164	{
67a9108e MF	165	unsigned num_entries;
	166	pgd_t pgd_k, pgd_efi;
	167	pud_t pud_k, pud_efi;
d2f7cbe7 BP	168
	169	if (efi_enabled(EFI_OLD_MEMMAP))
	170	return;
	171
67a9108e MF	172	/*
	173	* We can share all PGD entries apart from the one entry that
	174	* covers the EFI runtime mapping space.
	175	*
	176	* Make sure the EFI runtime region mappings are guaranteed to
	177	* only span a single PGD entry and that the entry also maps
	178	* other important kernel regions.
	179	*/
	180	BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
	181	BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
	182	(EFI_VA_END & PGDIR_MASK));
	183
	184	pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
	185	pgd_k = pgd_offset_k(PAGE_OFFSET);
	186
	187	num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
	188	memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);
d2f7cbe7	189
67a9108e MF	190	/*
	191	* We share all the PUD entries apart from those that map the
	192	* EFI regions. Copy around them.
	193	*/
	194	BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0);
	195	BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
	196
	197	pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
	198	pud_efi = pud_offset(pgd_efi, 0);
	199
	200	pgd_k = pgd_offset_k(EFI_VA_END);
	201	pud_k = pud_offset(pgd_k, 0);
	202
	203	num_entries = pud_index(EFI_VA_END);
	204	memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
	205
	206	pud_efi = pud_offset(pgd_efi, EFI_VA_START);
	207	pud_k = pud_offset(pgd_k, EFI_VA_START);
	208
	209	num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
	210	memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
d2f7cbe7 BP	211	}
d2f7cbe7 BP	212
4e78eb05	213	int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
d2f7cbe7	214	{
edc3b912	215	unsigned long pfn, text;
b61a76f8	216	efi_memory_desc_t *md;
4f9dbcfc	217	struct page *page;
994448f1	218	unsigned npages;
b7b898ae BP	219	pgd_t *pgd;
	220
	221	if (efi_enabled(EFI_OLD_MEMMAP))
	222	return 0;
	223
67a9108e MF	224	efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd);
67a9108e MF	225	pgd = efi_pgd;
d2f7cbe7	226
b7b898ae BP	227	/*
	228	* It can happen that the physical address of new_memmap lands in memory
	229	* which is not mapped in the EFI page table. Therefore we need to go
	230	* and ident-map those pages containing the map before calling
	231	* phys_efi_set_virtual_address_map().
	232	*/
edc3b912	233	pfn = pa_memmap >> PAGE_SHIFT;
15f003d2	234	if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX \| _PAGE_RW)) {
b7b898ae BP	235	pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
	236	return 1;
	237	}
	238
	239	efi_scratch.use_pgd = true;
	240
4f9dbcfc MF	241	/*
	242	* When making calls to the firmware everything needs to be 1:1
	243	* mapped and addressable with 32-bit pointers. Map the kernel
	244	* text and allocate a new stack because we can't rely on the
	245	* stack pointer being < 4GB.
	246	*/
	247	if (!IS_ENABLED(CONFIG_EFI_MIXED))
994448f1	248	return 0;
4f9dbcfc	249
b61a76f8 MF	250	/*
	251	* Map all of RAM so that we can access arguments in the 1:1
	252	* mapping when making EFI runtime calls.
	253	*/
78ce248f	254	for_each_efi_memory_desc(md) {
b61a76f8 MF	255	if (md->type != EFI_CONVENTIONAL_MEMORY &&
	256	md->type != EFI_LOADER_DATA &&
	257	md->type != EFI_LOADER_CODE)
	258	continue;
	259
	260	pfn = md->phys_addr >> PAGE_SHIFT;
	261	npages = md->num_pages;
	262
15f003d2	263	if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, npages, _PAGE_RW)) {
b61a76f8 MF	264	pr_err("Failed to map 1:1 memory\n");
	265	return 1;
	266	}
	267	}
	268
4f9dbcfc MF	269	page = alloc_page(GFP_KERNEL\|__GFP_DMA32);
	270	if (!page)
	271	panic("Unable to allocate EFI runtime stack < 4GB\n");
	272
	273	efi_scratch.phys_stack = virt_to_phys(page_address(page));
	274	efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
	275
2ad510dc	276	npages = (_etext - _text) >> PAGE_SHIFT;
4f9dbcfc	277	text = __pa(_text);
edc3b912	278	pfn = text >> PAGE_SHIFT;
4f9dbcfc	279
15f003d2	280	if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, _PAGE_RW)) {
4f9dbcfc	281	pr_err("Failed to map kernel text 1:1\n");
994448f1	282	return 1;
4f9dbcfc	283	}
b7b898ae BP	284
	285	return 0;
	286	}
	287
d2f7cbe7 BP	288	static void __init __map_region(efi_memory_desc_t *md, u64 va)
d2f7cbe7 BP	289	{
15f003d2	290	unsigned long flags = _PAGE_RW;
edc3b912	291	unsigned long pfn;
67a9108e	292	pgd_t *pgd = efi_pgd;
d2f7cbe7 BP	293
d2f7cbe7 BP	294	if (!(md->attribute & EFI_MEMORY_WB))
edc3b912	295	flags \|= _PAGE_PCD;
d2f7cbe7	296
edc3b912 MF	297	pfn = md->phys_addr >> PAGE_SHIFT;
edc3b912 MF	298	if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
d2f7cbe7 BP	299	pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
	300	md->phys_addr, va);
	301	}
	302
	303	void __init efi_map_region(efi_memory_desc_t *md)
	304	{
	305	unsigned long size = md->num_pages << PAGE_SHIFT;
	306	u64 pa = md->phys_addr;
	307
	308	if (efi_enabled(EFI_OLD_MEMMAP))
	309	return old_map_region(md);
	310
	311	/*
	312	* Make sure the 1:1 mappings are present as a catch-all for b0rked
	313	* firmware which doesn't update all internal pointers after switching
	314	* to virtual mode and would otherwise crap on us.
	315	*/
	316	__map_region(md, md->phys_addr);
	317
4f9dbcfc MF	318	/*
	319	* Enforce the 1:1 mapping as the default virtual address when
	320	* booting in EFI mixed mode, because even though we may be
	321	* running a 64-bit kernel, the firmware may only be 32-bit.
	322	*/
	323	if (!efi_is_native () && IS_ENABLED(CONFIG_EFI_MIXED)) {
	324	md->virt_addr = md->phys_addr;
	325	return;
	326	}
	327
d2f7cbe7 BP	328	efi_va -= size;
	329
	330	/* Is PA 2M-aligned? */
	331	if (!(pa & (PMD_SIZE - 1))) {
	332	efi_va &= PMD_MASK;
	333	} else {
	334	u64 pa_offset = pa & (PMD_SIZE - 1);
	335	u64 prev_va = efi_va;
	336
	337	/* get us the same offset within this 2M page */
	338	efi_va = (efi_va & PMD_MASK) + pa_offset;
	339
	340	if (efi_va > prev_va)
	341	efi_va -= PMD_SIZE;
	342	}
	343
	344	if (efi_va < EFI_VA_END) {
	345	pr_warn(FW_WARN "VA address range overflow!\n");
	346	return;
	347	}
	348
	349	/* Do the VA map */
	350	__map_region(md, efi_va);
	351	md->virt_addr = efi_va;
	352	}
	353
3b266496 DY	354	/*
	355	* kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
	356	* md->virt_addr is the original virtual address which had been mapped in kexec
	357	* 1st kernel.
	358	*/
	359	void __init efi_map_region_fixed(efi_memory_desc_t *md)
	360	{
	361	__map_region(md, md->virt_addr);
	362	}
	363
e1ad783b	364	void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
3e8fa263	365	u32 type, u64 attribute)
e1ad783b KP	366	{
	367	unsigned long last_map_pfn;
	368
	369	if (type == EFI_MEMORY_MAPPED_IO)
	370	return ioremap(phys_addr, size);
	371
	372	last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
	373	if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
	374	unsigned long top = last_map_pfn << PAGE_SHIFT;
3e8fa263	375	efi_ioremap(top, size - (top - phys_addr), type, attribute);
e1ad783b KP	376	}
e1ad783b KP	377
3e8fa263 MF	378	if (!(attribute & EFI_MEMORY_WB))
	379	efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
	380
e1ad783b KP	381	return (void __iomem *)__va(phys_addr);
e1ad783b KP	382	}
1fec0533 DY	383
	384	void __init parse_efi_setup(u64 phys_addr, u32 data_len)
	385	{
	386	efi_setup = phys_addr + sizeof(struct setup_data);
1fec0533	387	}
c55d016f	388
6d0cc887	389	void __init efi_runtime_update_mappings(void)
c55d016f	390	{
6d0cc887 SP	391	unsigned long pfn;
	392	pgd_t *pgd = efi_pgd;
	393	efi_memory_desc_t *md;
6d0cc887 SP	394
	395	if (efi_enabled(EFI_OLD_MEMMAP)) {
	396	if (__supported_pte_mask & _PAGE_NX)
	397	runtime_code_page_mkexec();
	398	return;
	399	}
	400
	401	if (!efi_enabled(EFI_NX_PE_DATA))
c55d016f BP	402	return;
c55d016f BP	403
78ce248f	404	for_each_efi_memory_desc(md) {
6d0cc887	405	unsigned long pf = 0;
6d0cc887 SP	406
	407	if (!(md->attribute & EFI_MEMORY_RUNTIME))
	408	continue;
	409
	410	if (!(md->attribute & EFI_MEMORY_WB))
	411	pf \|= _PAGE_PCD;
	412
	413	if ((md->attribute & EFI_MEMORY_XP) \|\|
	414	(md->type == EFI_RUNTIME_SERVICES_DATA))
	415	pf \|= _PAGE_NX;
	416
	417	if (!(md->attribute & EFI_MEMORY_RO) &&
	418	(md->type != EFI_RUNTIME_SERVICES_CODE))
	419	pf \|= _PAGE_RW;
	420
	421	/* Update the 1:1 mapping */
	422	pfn = md->phys_addr >> PAGE_SHIFT;
	423	if (kernel_map_pages_in_pgd(pgd, pfn, md->phys_addr, md->num_pages, pf))
	424	pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
	425	md->phys_addr, md->virt_addr);
	426
	427	if (kernel_map_pages_in_pgd(pgd, pfn, md->virt_addr, md->num_pages, pf))
	428	pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
	429	md->phys_addr, md->virt_addr);
	430	}
c55d016f	431	}
11cc8512 BP	432
	433	void __init efi_dump_pagetable(void)
	434	{
	435	#ifdef CONFIG_EFI_PGT_DUMP
67a9108e	436	ptdump_walk_pgd_level(NULL, efi_pgd);
11cc8512 BP	437	#endif
11cc8512 BP	438	}
994448f1	439
4f9dbcfc MF	440	#ifdef CONFIG_EFI_MIXED
	441	extern efi_status_t efi64_thunk(u32, ...);
	442
	443	#define runtime_service32(func) \
	444	({ \
	445	u32 table = (u32)(unsigned long)efi.systab; \
	446	u32 rt, ___f; \
	447	\
	448	rt = (u32 *)(table + offsetof(efi_system_table_32_t, runtime)); \
	449	___f = (u32 )(rt + offsetof(efi_runtime_services_32_t, func)); \
	450	*___f; \
	451	})
	452
	453	/*
	454	* Switch to the EFI page tables early so that we can access the 1:1
	455	* runtime services mappings which are not mapped in any other page
	456	* tables. This function must be called before runtime_service32().
	457	*
	458	* Also, disable interrupts because the IDT points to 64-bit handlers,
	459	* which aren't going to function correctly when we switch to 32-bit.
	460	*/
	461	#define efi_thunk(f, ...) \
	462	({ \
	463	efi_status_t __s; \
21f86625 AT	464	unsigned long __flags; \
21f86625 AT	465	u32 __func; \
4f9dbcfc	466	\
21f86625 AT	467	local_irq_save(__flags); \
21f86625 AT	468	arch_efi_call_virt_setup(); \
4f9dbcfc	469	\
21f86625 AT	470	__func = runtime_service32(f); \
21f86625 AT	471	__s = efi64_thunk(__func, __VA_ARGS__); \
4f9dbcfc	472	\
21f86625 AT	473	arch_efi_call_virt_teardown(); \
21f86625 AT	474	local_irq_restore(__flags); \
4f9dbcfc MF	475	\
	476	__s; \
	477	})
	478
	479	efi_status_t efi_thunk_set_virtual_address_map(
	480	void *phys_set_virtual_address_map,
	481	unsigned long memory_map_size,
	482	unsigned long descriptor_size,
	483	u32 descriptor_version,
	484	efi_memory_desc_t *virtual_map)
	485	{
	486	efi_status_t status;
	487	unsigned long flags;
	488	u32 func;
	489
	490	efi_sync_low_kernel_mappings();
	491	local_irq_save(flags);
	492
	493	efi_scratch.prev_cr3 = read_cr3();
	494	write_cr3((unsigned long)efi_scratch.efi_pgt);
	495	__flush_tlb_all();
	496
	497	func = (u32)(unsigned long)phys_set_virtual_address_map;
	498	status = efi64_thunk(func, memory_map_size, descriptor_size,
	499	descriptor_version, virtual_map);
	500
	501	write_cr3(efi_scratch.prev_cr3);
	502	__flush_tlb_all();
	503	local_irq_restore(flags);
	504
	505	return status;
	506	}
	507
	508	static efi_status_t efi_thunk_get_time(efi_time_t tm, efi_time_cap_t tc)
	509	{
	510	efi_status_t status;
	511	u32 phys_tm, phys_tc;
	512
	513	spin_lock(&rtc_lock);
	514
	515	phys_tm = virt_to_phys(tm);
	516	phys_tc = virt_to_phys(tc);
	517
	518	status = efi_thunk(get_time, phys_tm, phys_tc);
	519
	520	spin_unlock(&rtc_lock);
	521
	522	return status;
	523	}
	524
	525	static efi_status_t efi_thunk_set_time(efi_time_t *tm)
	526	{
	527	efi_status_t status;
	528	u32 phys_tm;
	529
	530	spin_lock(&rtc_lock);
	531
	532	phys_tm = virt_to_phys(tm);
	533
	534	status = efi_thunk(set_time, phys_tm);
	535
	536	spin_unlock(&rtc_lock);
	537
	538	return status;
539	}
540
541	static efi_status_t
542	efi_thunk_get_wakeup_time(efi_bool_t enabled, efi_bool_t pending,
543	efi_time_t *tm)
544	{
545	efi_status_t status;
546	u32 phys_enabled, phys_pending, phys_tm;
547
548	spin_lock(&rtc_lock);
549
550	phys_enabled = virt_to_phys(enabled);
551	phys_pending = virt_to_phys(pending);
552	phys_tm = virt_to_phys(tm);
553
554	status = efi_thunk(get_wakeup_time, phys_enabled,
555	phys_pending, phys_tm);
556
557	spin_unlock(&rtc_lock);
558
559	return status;
560	}
561
562	static efi_status_t
563	efi_thunk_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
564	{
565	efi_status_t status;
566	u32 phys_tm;
567
568	spin_lock(&rtc_lock);
569
570	phys_tm = virt_to_phys(tm);
571
572	status = efi_thunk(set_wakeup_time, enabled, phys_tm);
573
574	spin_unlock(&rtc_lock);
575
576	return status;
577	}
578
579
580	static efi_status_t
581	efi_thunk_get_variable(efi_char16_t name, efi_guid_t vendor,
582	u32 attr, unsigned long data_size, void *data)
583	{
584	efi_status_t status;
585	u32 phys_name, phys_vendor, phys_attr;
586	u32 phys_data_size, phys_data;
587
588	phys_data_size = virt_to_phys(data_size);
589	phys_vendor = virt_to_phys(vendor);
590	phys_name = virt_to_phys(name);
591	phys_attr = virt_to_phys(attr);
592	phys_data = virt_to_phys(data);
593
594	status = efi_thunk(get_variable, phys_name, phys_vendor,
595	phys_attr, phys_data_size, phys_data);
596
597	return status;
598	}
599
600	static efi_status_t
601	efi_thunk_set_variable(efi_char16_t name, efi_guid_t vendor,
602	u32 attr, unsigned long data_size, void *data)
603	{
604	u32 phys_name, phys_vendor, phys_data;
605	efi_status_t status;
606
607	phys_name = virt_to_phys(name);
608	phys_vendor = virt_to_phys(vendor);
609	phys_data = virt_to_phys(data);
610
611	/* If data_size is > sizeof(u32) we've got problems */
612	status = efi_thunk(set_variable, phys_name, phys_vendor,
613	attr, data_size, phys_data);
614
615	return status;
616	}
617
618	static efi_status_t
619	efi_thunk_get_next_variable(unsigned long *name_size,
620	efi_char16_t *name,
621	efi_guid_t *vendor)
622	{
623	efi_status_t status;
624	u32 phys_name_size, phys_name, phys_vendor;
625
626	phys_name_size = virt_to_phys(name_size);
627	phys_vendor = virt_to_phys(vendor);
628	phys_name = virt_to_phys(name);
629
630	status = efi_thunk(get_next_variable, phys_name_size,
631	phys_name, phys_vendor);
632
633	return status;
634	}
635
636	static efi_status_t
637	efi_thunk_get_next_high_mono_count(u32 *count)
638	{
639	efi_status_t status;
640	u32 phys_count;
641
642	phys_count = virt_to_phys(count);
643	status = efi_thunk(get_next_high_mono_count, phys_count);
644
645	return status;
646	}
647
648	static void
649	efi_thunk_reset_system(int reset_type, efi_status_t status,
650	unsigned long data_size, efi_char16_t *data)
651	{
652	u32 phys_data;
653
654	phys_data = virt_to_phys(data);
655
656	efi_thunk(reset_system, reset_type, status, data_size, phys_data);
657	}
658
659	static efi_status_t
660	efi_thunk_update_capsule(efi_capsule_header_t **capsules,
661	unsigned long count, unsigned long sg_list)
662	{
663	/*
664	* To properly support this function we would need to repackage
665	* 'capsules' because the firmware doesn't understand 64-bit
666	* pointers.
667	*/
668	return EFI_UNSUPPORTED;
669	}
670
671	static efi_status_t
672	efi_thunk_query_variable_info(u32 attr, u64 *storage_space,
673	u64 *remaining_space,
674	u64 *max_variable_size)
675	{
676	efi_status_t status;
677	u32 phys_storage, phys_remaining, phys_max;
678
679	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
680	return EFI_UNSUPPORTED;
681
682	phys_storage = virt_to_phys(storage_space);
683	phys_remaining = virt_to_phys(remaining_space);
684	phys_max = virt_to_phys(max_variable_size);
685
9a11040f	686	status = efi_thunk(query_variable_info, attr, phys_storage,
4f9dbcfc MF	687	phys_remaining, phys_max);
	688
	689	return status;
	690	}
	691
	692	static efi_status_t
	693	efi_thunk_query_capsule_caps(efi_capsule_header_t **capsules,
	694	unsigned long count, u64 *max_size,
	695	int *reset_type)
	696	{
	697	/*
	698	* To properly support this function we would need to repackage
	699	* 'capsules' because the firmware doesn't understand 64-bit
	700	* pointers.
	701	*/
	702	return EFI_UNSUPPORTED;
	703	}
	704
	705	void efi_thunk_runtime_setup(void)
	706	{
	707	efi.get_time = efi_thunk_get_time;
	708	efi.set_time = efi_thunk_set_time;
	709	efi.get_wakeup_time = efi_thunk_get_wakeup_time;
	710	efi.set_wakeup_time = efi_thunk_set_wakeup_time;
	711	efi.get_variable = efi_thunk_get_variable;
	712	efi.get_next_variable = efi_thunk_get_next_variable;
	713	efi.set_variable = efi_thunk_set_variable;
	714	efi.get_next_high_mono_count = efi_thunk_get_next_high_mono_count;
	715	efi.reset_system = efi_thunk_reset_system;
	716	efi.query_variable_info = efi_thunk_query_variable_info;
	717	efi.update_capsule = efi_thunk_update_capsule;
	718	efi.query_capsule_caps = efi_thunk_query_capsule_caps;
	719	}
	720	#endif /* CONFIG_EFI_MIXED */