Merge tag 'efi-changes-for-v5.8' of...

Merge tag 'efi-changes-for-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi into efi/core

More EFI changes for v5.8:

 - Rename pr_efi/pr_efi_err to efi_info/efi_err, and use them consistently
 - Simplify and unify initrd loading
 - Parse the builtin command line on x86 (if provided)
 - Implement printk() support, including support for wide character strings
 - Some fixes for issues introduced by the first batch of v5.8 changes
 - Fix a missing prototypes warning
 - Simplify GDT handling in early mixed mode thunking code
 - Some other minor fixes and cleanups

Conflicts:
	drivers/firmware/efi/libstub/efistub.h
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Documentation/fb/efifb.rst

@@ -63,4 +63,9 @@ auto
         with the highest resolution, it will choose one with the highest color
         depth.
 
+list
+        The EFI stub will list out all the display modes that are available. A
+        specific mode can then be chosen using one of the above options for the
+        next boot.
+
 Edgar Hucek <gimli@dark-green.com>

arch/arm/boot/compressed/efi-header.S

@@ -60,7 +60,7 @@ optional_header:
 		.long	__pecoff_code_size		@ SizeOfCode
 		.long	__pecoff_data_size		@ SizeOfInitializedData
 		.long	0				@ SizeOfUninitializedData
-		.long	efi_entry - start		@ AddressOfEntryPoint
+		.long	efi_pe_entry - start		@ AddressOfEntryPoint
 		.long	start_offset			@ BaseOfCode
 		.long	__pecoff_data_start - start	@ BaseOfData
 

arch/arm64/kernel/efi-entry.S

@@ -14,7 +14,7 @@
 
 SYM_CODE_START(efi_enter_kernel)
 	/*
-	 * efi_entry() will have copied the kernel image if necessary and we
+	 * efi_pe_entry() will have copied the kernel image if necessary and we
 	 * end up here with device tree address in x1 and the kernel entry
 	 * point stored in x0. Save those values in registers which are
 	 * callee preserved.

arch/arm64/kernel/efi-header.S

@@ -27,7 +27,7 @@ optional_header:
 	.long	__initdata_begin - efi_header_end	// SizeOfCode
 	.long	__pecoff_data_size			// SizeOfInitializedData
 	.long	0					// SizeOfUninitializedData
-	.long	__efistub_efi_entry - _head		// AddressOfEntryPoint
+	.long	__efistub_efi_pe_entry - _head		// AddressOfEntryPoint
 	.long	efi_header_end - _head			// BaseOfCode
 
 extra_header_fields:

arch/x86/boot/compressed/efi_thunk_64.S

@@ -28,8 +28,6 @@ SYM_FUNC_START(__efi64_thunk)
 	push	%rbx
 
 	leaq	1f(%rip), %rbp
-	leaq	efi_gdt64(%rip), %rbx
-	movl	%ebx, 2(%rbx)		/* Fixup the gdt base address */
 
 	movl	%ds, %eax
 	push	%rax
@@ -48,7 +46,8 @@ SYM_FUNC_START(__efi64_thunk)
 	movl	%r8d, 0xc(%rsp)
 	movl	%r9d, 0x10(%rsp)
 
-	sgdt	0x14(%rsp)
+	leaq	0x14(%rsp), %rbx
+	sgdt	(%rbx)
 
 	/*
 	 * Switch to gdt with 32-bit segments. This is the firmware GDT
@@ -68,8 +67,7 @@ SYM_FUNC_START(__efi64_thunk)
 	pushq	%rax
 	lretq
 
-1:	lgdt	0x14(%rsp)
-	addq	$32, %rsp
+1:	addq	$32, %rsp
 	movq	%rdi, %rax
 
 	pop	%rbx
@@ -175,14 +173,3 @@ SYM_DATA_END(efi32_boot_cs)
 SYM_DATA_START(efi32_boot_ds)
 	.word	0
 SYM_DATA_END(efi32_boot_ds)
-
-SYM_DATA_START(efi_gdt64)
-	.word	efi_gdt64_end - efi_gdt64
-	.long	0			/* Filled out by user */
-	.word	0
-	.quad	0x0000000000000000	/* NULL descriptor */
-	.quad	0x00af9a000000ffff	/* __KERNEL_CS */
-	.quad	0x00cf92000000ffff	/* __KERNEL_DS */
-	.quad	0x0080890000000000	/* TS descriptor */
-	.quad   0x0000000000000000	/* TS continued */
-SYM_DATA_END_LABEL(efi_gdt64, SYM_L_LOCAL, efi_gdt64_end)

arch/x86/include/asm/efi.h

@@ -9,6 +9,7 @@
 #include <asm/nospec-branch.h>
 #include <asm/mmu_context.h>
 #include <linux/build_bug.h>
+#include <linux/kernel.h>
 
 extern unsigned long efi_fw_vendor, efi_config_table;
 
@@ -225,13 +226,15 @@ efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
 
 /* arch specific definitions used by the stub code */
 
-extern const bool efi_is64;
+#ifdef CONFIG_EFI_MIXED
+
+#define ARCH_HAS_EFISTUB_WRAPPERS
 
 static inline bool efi_is_64bit(void)
 {
-	if (IS_ENABLED(CONFIG_EFI_MIXED))
-		return efi_is64;
-	return IS_ENABLED(CONFIG_X86_64);
+	extern const bool efi_is64;
+
+	return efi_is64;
 }
 
 static inline bool efi_is_native(void)
@@ -291,6 +294,15 @@ static inline u32 efi64_convert_status(efi_status_t status)
 #define __efi64_argmap_allocate_pool(type, size, buffer)		\
 	((type), (size), efi64_zero_upper(buffer))
 
+#define __efi64_argmap_create_event(type, tpl, f, c, event)		\
+	((type), (tpl), (f), (c), efi64_zero_upper(event))
+
+#define __efi64_argmap_set_timer(event, type, time)			\
+	((event), (type), lower_32_bits(time), upper_32_bits(time))
+
+#define __efi64_argmap_wait_for_event(num, event, index)		\
+	((num), (event), efi64_zero_upper(index))
+
 #define __efi64_argmap_handle_protocol(handle, protocol, interface)	\
 	((handle), (protocol), efi64_zero_upper(interface))
 
@@ -356,6 +368,15 @@ static inline u32 efi64_convert_status(efi_status_t status)
 						   runtime),		\
 				    func, __VA_ARGS__))
 
+#else /* CONFIG_EFI_MIXED */
+
+static inline bool efi_is_64bit(void)
+{
+	return IS_ENABLED(CONFIG_X86_64);
+}
+
+#endif /* CONFIG_EFI_MIXED */
+
 extern bool efi_reboot_required(void);
 extern bool efi_is_table_address(unsigned long phys_addr);
 

arch/x86/xen/efi.c

@@ -29,7 +29,7 @@ static efi_system_table_t efi_systab_xen __initdata = {
 	.fw_vendor	= EFI_INVALID_TABLE_ADDR, /* Initialized later. */
 	.fw_revision	= 0,			  /* Initialized later. */
 	.con_in_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.con_in		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.con_in		= NULL,			  /* Not used under Xen. */
 	.con_out_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 	.con_out	= NULL, 		  /* Not used under Xen. */
 	.stderr_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */

drivers/firmware/efi/efivars.c

@@ -522,8 +522,10 @@ efivar_create_sysfs_entry(struct efivar_entry *new_var)
 	ret = kobject_init_and_add(&new_var->kobj, &efivar_ktype,
 				   NULL, "%s", short_name);
 	kfree(short_name);
-	if (ret)
+	if (ret) {
+		kobject_put(&new_var->kobj);
 		return ret;
+	}
 
 	kobject_uevent(&new_var->kobj, KOBJ_ADD);
 	if (efivar_entry_add(new_var, &efivar_sysfs_list)) {

drivers/firmware/efi/libstub/Makefile

@@ -7,7 +7,7 @@
 #
 cflags-$(CONFIG_X86_32)		:= -march=i386
 cflags-$(CONFIG_X86_64)		:= -mcmodel=small
-cflags-$(CONFIG_X86)		+= -m$(BITS) -D__KERNEL__ -O2 \
+cflags-$(CONFIG_X86)		+= -m$(BITS) -D__KERNEL__ \
 				   -fPIC -fno-strict-aliasing -mno-red-zone \
 				   -mno-mmx -mno-sse -fshort-wchar \
 				   -Wno-pointer-sign \
@@ -25,11 +25,12 @@ cflags-$(CONFIG_ARM)		:= $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
 
 cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt
 
-KBUILD_CFLAGS			:= $(cflags-y) -DDISABLE_BRANCH_PROFILING \
+KBUILD_CFLAGS			:= $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
 				   -include $(srctree)/drivers/firmware/efi/libstub/hidden.h \
 				   -D__NO_FORTIFY \
 				   $(call cc-option,-ffreestanding) \
 				   $(call cc-option,-fno-stack-protector) \
+				   $(call cc-option,-fno-addrsig) \
 				   -D__DISABLE_EXPORTS
 
 GCOV_PROFILE			:= n
@@ -43,7 +44,7 @@ KCOV_INSTRUMENT			:= n
 lib-y				:= efi-stub-helper.o gop.o secureboot.o tpm.o \
 				   file.o mem.o random.o randomalloc.o pci.o \
 				   skip_spaces.o lib-cmdline.o lib-ctype.o \
-				   alignedmem.o relocate.o
+				   alignedmem.o relocate.o vsprintf.o
 
 # include the stub's generic dependencies from lib/ when building for ARM/arm64
 efi-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c

drivers/firmware/efi/libstub/arm32-stub.c

@@ -18,7 +18,7 @@ efi_status_t check_platform_features(void)
 	/* LPAE kernels need compatible hardware */
 	block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
 	if (block < 5) {
-		pr_efi_err("This LPAE kernel is not supported by your CPU\n");
+		efi_err("This LPAE kernel is not supported by your CPU\n");
 		return EFI_UNSUPPORTED;
 	}
 	return EFI_SUCCESS;
@@ -120,7 +120,7 @@ static efi_status_t reserve_kernel_base(unsigned long dram_base,
 	 */
 	status = efi_get_memory_map(&map);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("reserve_kernel_base(): Unable to retrieve memory map.\n");
+		efi_err("reserve_kernel_base(): Unable to retrieve memory map.\n");
 		return status;
 	}
 
@@ -162,7 +162,7 @@ static efi_status_t reserve_kernel_base(unsigned long dram_base,
 					     (end - start) / EFI_PAGE_SIZE,
 					     &start);
 			if (status != EFI_SUCCESS) {
-				pr_efi_err("reserve_kernel_base(): alloc failed.\n");
+				efi_err("reserve_kernel_base(): alloc failed.\n");
 				goto out;
 			}
 			break;
@@ -219,7 +219,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 
 	status = reserve_kernel_base(kernel_base, reserve_addr, reserve_size);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Unable to allocate memory for uncompressed kernel.\n");
+		efi_err("Unable to allocate memory for uncompressed kernel.\n");
 		return status;
 	}
 
@@ -232,7 +232,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 	status = efi_relocate_kernel(image_addr, *image_size, *image_size,
 				     kernel_base + MAX_UNCOMP_KERNEL_SIZE, 0, 0);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to relocate kernel.\n");
+		efi_err("Failed to relocate kernel.\n");
 		efi_free(*reserve_size, *reserve_addr);
 		*reserve_size = 0;
 		return status;
@@ -244,7 +244,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 	 * address at which the zImage is loaded.
 	 */
 	if (*image_addr + *image_size > dram_base + ZIMAGE_OFFSET_LIMIT) {
-		pr_efi_err("Failed to relocate kernel, no low memory available.\n");
+		efi_err("Failed to relocate kernel, no low memory available.\n");
 		efi_free(*reserve_size, *reserve_addr);
 		*reserve_size = 0;
 		efi_free(*image_size, *image_addr);

drivers/firmware/efi/libstub/arm64-stub.c

@@ -26,9 +26,9 @@ efi_status_t check_platform_features(void)
 	tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_TGRAN_SHIFT) & 0xf;
 	if (tg != ID_AA64MMFR0_TGRAN_SUPPORTED) {
 		if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
-			pr_efi_err("This 64 KB granular kernel is not supported by your CPU\n");
+			efi_err("This 64 KB granular kernel is not supported by your CPU\n");
 		else
-			pr_efi_err("This 16 KB granular kernel is not supported by your CPU\n");
+			efi_err("This 16 KB granular kernel is not supported by your CPU\n");
 		return EFI_UNSUPPORTED;
 	}
 	return EFI_SUCCESS;
@@ -59,18 +59,18 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 			status = efi_get_random_bytes(sizeof(phys_seed),
 						      (u8 *)&phys_seed);
 			if (status == EFI_NOT_FOUND) {
-				pr_efi("EFI_RNG_PROTOCOL unavailable, no randomness supplied\n");
+				efi_info("EFI_RNG_PROTOCOL unavailable, no randomness supplied\n");
 			} else if (status != EFI_SUCCESS) {
-				pr_efi_err("efi_get_random_bytes() failed\n");
+				efi_err("efi_get_random_bytes() failed\n");
 				return status;
 			}
 		} else {
-			pr_efi("KASLR disabled on kernel command line\n");
+			efi_info("KASLR disabled on kernel command line\n");
 		}
 	}
 
 	if (image->image_base != _text)
-		pr_efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
+		efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
 
 	kernel_size = _edata - _text;
 	kernel_memsize = kernel_size + (_end - _edata);
@@ -102,7 +102,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 						    ULONG_MAX, min_kimg_align);
 
 		if (status != EFI_SUCCESS) {
-			pr_efi_err("Failed to relocate kernel\n");
+			efi_err("Failed to relocate kernel\n");
 			*reserve_size = 0;
 			return status;
 		}

drivers/firmware/efi/libstub/efi-stub-helper.c

@@ -7,15 +7,21 @@
  * Copyright 2011 Intel Corporation; author Matt Fleming
  */
 
+#include <stdarg.h>
+
+#include <linux/ctype.h>
 #include <linux/efi.h>
+#include <linux/kernel.h>
+#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */
 #include <asm/efi.h>
+#include <asm/setup.h>
 
 #include "efistub.h"
 
 bool efi_nochunk;
 bool efi_nokaslr;
 bool efi_noinitrd;
-bool efi_quiet;
+int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
 bool efi_novamap;
 
 static bool efi_nosoftreserve;
@@ -26,21 +32,126 @@ bool __pure __efi_soft_reserve_enabled(void)
 	return !efi_nosoftreserve;
 }
 
-void efi_printk(char *str)
+void efi_char16_puts(efi_char16_t *str)
 {
-	char *s8;
+	efi_call_proto(efi_table_attr(efi_system_table, con_out),
+		       output_string, str);
+}
 
-	for (s8 = str; *s8; s8++) {
-		efi_char16_t ch[2] = { 0 };
+static
+u32 utf8_to_utf32(const u8 **s8)
+{
+	u32 c32;
+	u8 c0, cx;
+	size_t clen, i;
+
+	c0 = cx = *(*s8)++;
+	/*
+	 * The position of the most-significant 0 bit gives us the length of
+	 * a multi-octet encoding.
+	 */
+	for (clen = 0; cx & 0x80; ++clen)
+		cx <<= 1;
+	/*
+	 * If the 0 bit is in position 8, this is a valid single-octet
+	 * encoding. If the 0 bit is in position 7 or positions 1-3, the
+	 * encoding is invalid.
+	 * In either case, we just return the first octet.
+	 */
+	if (clen < 2 || clen > 4)
+		return c0;
+	/* Get the bits from the first octet. */
+	c32 = cx >> clen--;
+	for (i = 0; i < clen; ++i) {
+		/* Trailing octets must have 10 in most significant bits. */
+		cx = (*s8)[i] ^ 0x80;
+		if (cx & 0xc0)
+			return c0;
+		c32 = (c32 << 6) | cx;
+	}
+	/*
+	 * Check for validity:
+	 * - The character must be in the Unicode range.
+	 * - It must not be a surrogate.
+	 * - It must be encoded using the correct number of octets.
+	 */
+	if (c32 > 0x10ffff ||
+	    (c32 & 0xf800) == 0xd800 ||
+	    clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000))
+		return c0;
+	*s8 += clen;
+	return c32;
+}
 
-		ch[0] = *s8;
-		if (*s8 == '\n') {
-			efi_char16_t nl[2] = { '\r', 0 };
-			efi_char16_printk(nl);
+void efi_puts(const char *str)
+{
+	efi_char16_t buf[128];
+	size_t pos = 0, lim = ARRAY_SIZE(buf);
+	const u8 *s8 = (const u8 *)str;
+	u32 c32;
+
+	while (*s8) {
+		if (*s8 == '\n')
+			buf[pos++] = L'\r';
+		c32 = utf8_to_utf32(&s8);
+		if (c32 < 0x10000) {
+			/* Characters in plane 0 use a single word. */
+			buf[pos++] = c32;
+		} else {
+			/*
+			 * Characters in other planes encode into a surrogate
+			 * pair.
+			 */
+			buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10);
+			buf[pos++] = 0xdc00 + (c32 & 0x3ff);
 		}
+		if (*s8 == '\0' || pos >= lim - 2) {
+			buf[pos] = L'\0';
+			efi_char16_puts(buf);
+			pos = 0;
+		}
+	}
+}
+
+int efi_printk(const char *fmt, ...)
+{
+	char printf_buf[256];
+	va_list args;
+	int printed;
+	int loglevel = printk_get_level(fmt);
+
+	switch (loglevel) {
+	case '0' ... '9':
+		loglevel -= '0';
+		break;
+	default:
+		/*
+		 * Use loglevel -1 for cases where we just want to print to
+		 * the screen.
+		 */
+		loglevel = -1;
+		break;
+	}
+
+	if (loglevel >= efi_loglevel)
+		return 0;
+
+	if (loglevel >= 0)
+		efi_puts("EFI stub: ");
+
+	fmt = printk_skip_level(fmt);
+
+	va_start(args, fmt);
+	printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
+	va_end(args);
 
-		efi_char16_printk(ch);
+	efi_puts(printf_buf);
+	if (printed >= sizeof(printf_buf)) {
+		efi_puts("[Message truncated]\n");
+		return -1;
 	}
+
+	return printed;
 }
 
 /*
@@ -71,7 +182,7 @@ efi_status_t efi_parse_options(char const *cmdline)
 		if (!strcmp(param, "nokaslr")) {
 			efi_nokaslr = true;
 		} else if (!strcmp(param, "quiet")) {
-			efi_quiet = true;
+			efi_loglevel = CONSOLE_LOGLEVEL_QUIET;
 		} else if (!strcmp(param, "noinitrd")) {
 			efi_noinitrd = true;
 		} else if (!strcmp(param, "efi") && val) {
@@ -85,6 +196,8 @@ efi_status_t efi_parse_options(char const *cmdline)
 				efi_disable_pci_dma = true;
 			if (parse_option_str(val, "no_disable_early_pci_dma"))
 				efi_disable_pci_dma = false;
+			if (parse_option_str(val, "debug"))
+				efi_loglevel = CONSOLE_LOGLEVEL_DEBUG;
 		} else if (!strcmp(param, "video") &&
 			   val && strstarts(val, "efifb:")) {
 			efi_parse_option_graphics(val + strlen("efifb:"));
@@ -94,98 +207,80 @@ efi_status_t efi_parse_options(char const *cmdline)
 	return EFI_SUCCESS;
 }
 
-/*
- * Get the number of UTF-8 bytes corresponding to an UTF-16 character.
- * This overestimates for surrogates, but that is okay.
- */
-static int efi_utf8_bytes(u16 c)
-{
-	return 1 + (c >= 0x80) + (c >= 0x800);
-}
-
-/*
- * Convert an UTF-16 string, not necessarily null terminated, to UTF-8.
- */
-static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n)
-{
-	unsigned int c;
-
-	while (n--) {
-		c = *src++;
-		if (n && c >= 0xd800 && c <= 0xdbff &&
-		    *src >= 0xdc00 && *src <= 0xdfff) {
-			c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff);
-			src++;
-			n--;
-		}
-		if (c >= 0xd800 && c <= 0xdfff)
-			c = 0xfffd; /* Unmatched surrogate */
-		if (c < 0x80) {
-			*dst++ = c;
-			continue;
-		}
-		if (c < 0x800) {
-			*dst++ = 0xc0 + (c >> 6);
-			goto t1;
-		}
-		if (c < 0x10000) {
-			*dst++ = 0xe0 + (c >> 12);
-			goto t2;
-		}
-		*dst++ = 0xf0 + (c >> 18);
-		*dst++ = 0x80 + ((c >> 12) & 0x3f);
-	t2:
-		*dst++ = 0x80 + ((c >> 6) & 0x3f);
-	t1:
-		*dst++ = 0x80 + (c & 0x3f);
-	}
-
-	return dst;
-}
-
 /*
  * Convert the unicode UEFI command line to ASCII to pass to kernel.
  * Size of memory allocated return in *cmd_line_len.
  * Returns NULL on error.
  */
-char *efi_convert_cmdline(efi_loaded_image_t *image,
-			  int *cmd_line_len, unsigned long max_addr)
+char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
 {
 	const u16 *s2;
-	u8 *s1 = NULL;
 	unsigned long cmdline_addr = 0;
-	int load_options_chars = efi_table_attr(image, load_options_size) / 2;
+	int options_chars = efi_table_attr(image, load_options_size) / 2;
 	const u16 *options = efi_table_attr(image, load_options);
-	int options_bytes = 0;  /* UTF-8 bytes */
-	int options_chars = 0;  /* UTF-16 chars */
+	int options_bytes = 0, safe_options_bytes = 0;  /* UTF-8 bytes */
+	bool in_quote = false;
 	efi_status_t status;
-	u16 zero = 0;
 
 	if (options) {
 		s2 = options;
-		while (*s2 && *s2 != '\n'
-		       && options_chars < load_options_chars) {
-			options_bytes += efi_utf8_bytes(*s2++);
-			options_chars++;
+		while (options_bytes < COMMAND_LINE_SIZE && options_chars--) {
+			u16 c = *s2++;
+
+			if (c < 0x80) {
+				if (c == L'\0' || c == L'\n')
+					break;
+				if (c == L'"')
+					in_quote = !in_quote;
+				else if (!in_quote && isspace((char)c))
+					safe_options_bytes = options_bytes;
+
+				options_bytes++;
+				continue;
+			}
+
+			/*
+			 * Get the number of UTF-8 bytes corresponding to a
+			 * UTF-16 character.
+			 * The first part handles everything in the BMP.
+			 */
+			options_bytes += 2 + (c >= 0x800);
+			/*
+			 * Add one more byte for valid surrogate pairs. Invalid
+			 * surrogates will be replaced with 0xfffd and take up
+			 * only 3 bytes.
+			 */
+			if ((c & 0xfc00) == 0xd800) {
+				/*
+				 * If the very last word is a high surrogate,
+				 * we must ignore it since we can't access the
+				 * low surrogate.
+				 */
+				if (!options_chars) {
+					options_bytes -= 3;
+				} else if ((*s2 & 0xfc00) == 0xdc00) {
+					options_bytes++;
+					options_chars--;
+					s2++;
+				}
+			}
+		}
+		if (options_bytes >= COMMAND_LINE_SIZE) {
+			options_bytes = safe_options_bytes;
+			efi_err("Command line is too long: truncated to %d bytes\n",
+				options_bytes);
 		}
-	}
-
-	if (!options_chars) {
-		/* No command line options, so return empty string*/
-		options = &zero;
 	}
 
 	options_bytes++;	/* NUL termination */
 
-	status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr);
+	status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes,
+			     (void **)&cmdline_addr);
 	if (status != EFI_SUCCESS)
 		return NULL;
 
-	s1 = (u8 *)cmdline_addr;
-	s2 = (const u16 *)options;
-
-	s1 = efi_utf16_to_utf8(s1, s2, options_chars);
-	*s1 = '\0';
+	snprintf((char *)cmdline_addr, options_bytes, "%.*ls",
+		 options_bytes - 1, options);
 
 	*cmd_line_len = options_bytes;
 	return (char *)cmdline_addr;
@@ -284,12 +379,6 @@ void *get_efi_config_table(efi_guid_t guid)
 	return NULL;
 }
 
-void efi_char16_printk(efi_char16_t *str)
-{
-	efi_call_proto(efi_table_attr(efi_system_table, con_out),
-		       output_string, str);
-}
-
 /*
  * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way
  * for the firmware or bootloader to expose the initrd data directly to the stub
@@ -331,6 +420,7 @@ static const struct {
  *		%EFI_OUT_OF_RESOURCES if memory allocation failed
  *		%EFI_LOAD_ERROR in all other cases
  */
+static
 efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
 				      unsigned long *load_size,
 				      unsigned long max)
@@ -343,9 +433,6 @@ efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
 	efi_handle_t handle;
 	efi_status_t status;
 
-	if (!load_addr || !load_size)
-		return EFI_INVALID_PARAMETER;
-
 	dp = (efi_device_path_protocol_t *)&initrd_dev_path;
 	status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle);
 	if (status != EFI_SUCCESS)
@@ -375,3 +462,80 @@ efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
 	*load_size = initrd_size;
 	return EFI_SUCCESS;
 }
+
+static
+efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
+				     unsigned long *load_addr,
+				     unsigned long *load_size,
+				     unsigned long soft_limit,
+				     unsigned long hard_limit)
+{
+	if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) ||
+	    (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) {
+		*load_addr = *load_size = 0;
+		return EFI_SUCCESS;
+	}
+
+	return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
+				    soft_limit, hard_limit,
+				    load_addr, load_size);
+}
+
+efi_status_t efi_load_initrd(efi_loaded_image_t *image,
+			     unsigned long *load_addr,
+			     unsigned long *load_size,
+			     unsigned long soft_limit,
+			     unsigned long hard_limit)
+{
+	efi_status_t status;
+
+	if (!load_addr || !load_size)
+		return EFI_INVALID_PARAMETER;
+
+	status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit);
+	if (status == EFI_SUCCESS) {
+		efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
+	} else if (status == EFI_NOT_FOUND) {
+		status = efi_load_initrd_cmdline(image, load_addr, load_size,
+						 soft_limit, hard_limit);
+		if (status == EFI_SUCCESS && *load_size > 0)
+			efi_info("Loaded initrd from command line option\n");
+	}
+
+	return status;
+}
+
+efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key)
+{
+	efi_event_t events[2], timer;
+	unsigned long index;
+	efi_simple_text_input_protocol_t *con_in;
+	efi_status_t status;
+
+	con_in = efi_table_attr(efi_system_table, con_in);
+	if (!con_in)
+		return EFI_UNSUPPORTED;
+	efi_set_event_at(events, 0, efi_table_attr(con_in, wait_for_key));
+
+	status = efi_bs_call(create_event, EFI_EVT_TIMER, 0, NULL, NULL, &timer);
+	if (status != EFI_SUCCESS)
+		return status;
+
+	status = efi_bs_call(set_timer, timer, EfiTimerRelative,
+			     EFI_100NSEC_PER_USEC * usec);
+	if (status != EFI_SUCCESS)
+		return status;
+	efi_set_event_at(events, 1, timer);
+
+	status = efi_bs_call(wait_for_event, 2, events, &index);
+	if (status == EFI_SUCCESS) {
+		if (index == 0)
+			status = efi_call_proto(con_in, read_keystroke, key);
+		else
+			status = EFI_TIMEOUT;
+	}
+
+	efi_bs_call(close_event, timer);
+
+	return status;
+}

drivers/firmware/efi/libstub/efi-stub.c

@@ -73,7 +73,7 @@ static void install_memreserve_table(void)
 	status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv),
 			     (void **)&rsv);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to allocate memreserve entry!\n");
+		efi_err("Failed to allocate memreserve entry!\n");
 		return;
 	}
 
@@ -84,7 +84,7 @@ static void install_memreserve_table(void)
 	status = efi_bs_call(install_configuration_table,
 			     &memreserve_table_guid, rsv);
 	if (status != EFI_SUCCESS)
-		pr_efi_err("Failed to install memreserve config table!\n");
+		efi_err("Failed to install memreserve config table!\n");
 }
 
 static unsigned long get_dram_base(void)
@@ -144,7 +144,8 @@ asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint,
  * for both archictectures, with the arch-specific code provided in the
  * handle_kernel_image() function.
  */
-efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
+efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
+				   efi_system_table_t *sys_table_arg)
 {
 	efi_loaded_image_t *image;
 	efi_status_t status;
@@ -186,13 +187,13 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 	status = efi_system_table->boottime->handle_protocol(handle,
 					&loaded_image_proto, (void *)&image);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to get loaded image protocol\n");
+		efi_err("Failed to get loaded image protocol\n");
 		goto fail;
 	}
 
 	dram_base = get_dram_base();
 	if (dram_base == EFI_ERROR) {
-		pr_efi_err("Failed to find DRAM base\n");
+		efi_err("Failed to find DRAM base\n");
 		status = EFI_LOAD_ERROR;
 		goto fail;
 	}
@@ -202,22 +203,32 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 	 * protocol. We are going to copy the command line into the
 	 * device tree, so this can be allocated anywhere.
 	 */
-	cmdline_ptr = efi_convert_cmdline(image, &cmdline_size, ULONG_MAX);
+	cmdline_ptr = efi_convert_cmdline(image, &cmdline_size);
 	if (!cmdline_ptr) {
-		pr_efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
+		efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
 		status = EFI_OUT_OF_RESOURCES;
 		goto fail;
 	}
 
 	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
 	    IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
-	    cmdline_size == 0)
-		efi_parse_options(CONFIG_CMDLINE);
+	    cmdline_size == 0) {
+		status = efi_parse_options(CONFIG_CMDLINE);
+		if (status != EFI_SUCCESS) {
+			efi_err("Failed to parse options\n");
+			goto fail_free_cmdline;
+		}
+	}
 
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0)
-		efi_parse_options(cmdline_ptr);
+	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
+		status = efi_parse_options(cmdline_ptr);
+		if (status != EFI_SUCCESS) {
+			efi_err("Failed to parse options\n");
+			goto fail_free_cmdline;
+		}
+	}
 
-	pr_efi("Booting Linux Kernel...\n");
+	efi_info("Booting Linux Kernel...\n");
 
 	si = setup_graphics();
 
@@ -226,8 +237,8 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 				     &reserve_size,
 				     dram_base, image);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to relocate kernel\n");
-		goto fail_free_cmdline;
+		efi_err("Failed to relocate kernel\n");
+		goto fail_free_screeninfo;
 	}
 
 	efi_retrieve_tpm2_eventlog();
@@ -245,42 +256,34 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 	if (!IS_ENABLED(CONFIG_EFI_ARMSTUB_DTB_LOADER) ||
 	     secure_boot != efi_secureboot_mode_disabled) {
 		if (strstr(cmdline_ptr, "dtb="))
-			pr_efi("Ignoring DTB from command line.\n");
+			efi_err("Ignoring DTB from command line.\n");
 	} else {
 		status = efi_load_dtb(image, &fdt_addr, &fdt_size);
 
 		if (status != EFI_SUCCESS) {
-			pr_efi_err("Failed to load device tree!\n");
+			efi_err("Failed to load device tree!\n");
 			goto fail_free_image;
 		}
 	}
 
 	if (fdt_addr) {
-		pr_efi("Using DTB from command line\n");
+		efi_info("Using DTB from command line\n");
 	} else {
 		/* Look for a device tree configuration table entry. */
 		fdt_addr = (uintptr_t)get_fdt(&fdt_size);
 		if (fdt_addr)
-			pr_efi("Using DTB from configuration table\n");
+			efi_info("Using DTB from configuration table\n");
 	}
 
 	if (!fdt_addr)
-		pr_efi("Generating empty DTB\n");
+		efi_info("Generating empty DTB\n");
 
 	if (!efi_noinitrd) {
 		max_addr = efi_get_max_initrd_addr(dram_base, image_addr);
-		status = efi_load_initrd_dev_path(&initrd_addr, &initrd_size,
-						  max_addr);
-		if (status == EFI_SUCCESS) {
-			pr_efi("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
-		} else if (status == EFI_NOT_FOUND) {
-			status = efi_load_initrd(image, &initrd_addr, &initrd_size,
-						 ULONG_MAX, max_addr);
-			if (status == EFI_SUCCESS && initrd_size > 0)
-				pr_efi("Loaded initrd from command line option\n");
-		}
+		status = efi_load_initrd(image, &initrd_addr, &initrd_size,
+					 ULONG_MAX, max_addr);
 		if (status != EFI_SUCCESS)
-			pr_efi_err("Failed to load initrd!\n");
+			efi_err("Failed to load initrd!\n");
 	}
 
 	efi_random_get_seed();
@@ -330,7 +333,7 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 	/* not reached */
 
 fail_free_initrd:
-	pr_efi_err("Failed to update FDT and exit boot services\n");
+	efi_err("Failed to update FDT and exit boot services\n");
 
 	efi_free(initrd_size, initrd_addr);
 	efi_free(fdt_size, fdt_addr);
@@ -338,9 +341,10 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
 fail_free_image:
 	efi_free(image_size, image_addr);
 	efi_free(reserve_size, reserve_addr);
-fail_free_cmdline:
+fail_free_screeninfo:
 	free_screen_info(si);
-	efi_free(cmdline_size, (unsigned long)cmdline_ptr);
+fail_free_cmdline:
+	efi_bs_call(free_pool, cmdline_ptr);
 fail:
 	return status;
 }

drivers/firmware/efi/libstub/efistub.h

@@ -3,6 +3,13 @@
 #ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
 #define _DRIVERS_FIRMWARE_EFI_EFISTUB_H
 
+#include <linux/compiler.h>
+#include <linux/efi.h>
+#include <linux/kernel.h>
+#include <linux/kern_levels.h>
+#include <linux/types.h>
+#include <asm/efi.h>
+
 /* error code which can't be mistaken for valid address */
 #define EFI_ERROR	(~0UL)
 
@@ -28,32 +35,30 @@
 extern bool efi_nochunk;
 extern bool efi_nokaslr;
 extern bool efi_noinitrd;
-extern bool efi_quiet;
+extern int efi_loglevel;
 extern bool efi_novamap;
 
 extern const efi_system_table_t *efi_system_table;
 
-#ifndef efi_bs_call
+efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
+				   efi_system_table_t *sys_table_arg);
+
+#ifndef ARCH_HAS_EFISTUB_WRAPPERS
+
+#define efi_is_native()		(true)
 #define efi_bs_call(func, ...)	efi_system_table->boottime->func(__VA_ARGS__)
-#endif
-#ifndef efi_rt_call
 #define efi_rt_call(func, ...)	efi_system_table->runtime->func(__VA_ARGS__)
-#endif
-#ifndef efi_is_native
-#define efi_is_native()		(true)
-#endif
-#ifndef efi_table_attr
 #define efi_table_attr(inst, attr)	(inst->attr)
-#endif
-#ifndef efi_call_proto
 #define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)
-#endif
 
-#define pr_efi(msg)		do {			\
-	if (!efi_quiet) efi_printk("EFI stub: "msg);	\
-} while (0)
+#endif
 
-#define pr_efi_err(msg) efi_printk("EFI stub: ERROR: "msg)
+#define efi_info(fmt, ...) \
+	efi_printk(KERN_INFO fmt, ##__VA_ARGS__)
+#define efi_err(fmt, ...) \
+	efi_printk(KERN_ERR "ERROR: " fmt, ##__VA_ARGS__)
+#define efi_debug(fmt, ...) \
+	efi_printk(KERN_DEBUG "DEBUG: " fmt, ##__VA_ARGS__)
 
 /* Helper macros for the usual case of using simple C variables: */
 #ifndef fdt_setprop_inplace_var
@@ -87,6 +92,13 @@ extern const efi_system_table_t *efi_system_table;
 		((handle = efi_get_handle_at((array), i)) || true);	\
 	     i++)
 
+static inline
+void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
+{
+	*lo = lower_32_bits(data);
+	*hi = upper_32_bits(data);
+}
+
 /*
  * Allocation types for calls to boottime->allocate_pages.
  */
@@ -102,6 +114,16 @@ extern const efi_system_table_t *efi_system_table;
 #define EFI_LOCATE_BY_REGISTER_NOTIFY		1
 #define EFI_LOCATE_BY_PROTOCOL			2
 
+/*
+ * boottime->stall takes the time period in microseconds
+ */
+#define EFI_USEC_PER_SEC		1000000
+
+/*
+ * boottime->set_timer takes the time in 100ns units
+ */
+#define EFI_100NSEC_PER_USEC	((u64)10)
+
 /*
  * An efi_boot_memmap is used by efi_get_memory_map() to return the
  * EFI memory map in a dynamically allocated buffer.
@@ -126,6 +148,39 @@ struct efi_boot_memmap {
 
 typedef struct efi_generic_dev_path efi_device_path_protocol_t;
 
+typedef void *efi_event_t;
+/* Note that notifications won't work in mixed mode */
+typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *);
+
+#define EFI_EVT_TIMER		0x80000000U
+#define EFI_EVT_RUNTIME		0x40000000U
+#define EFI_EVT_NOTIFY_WAIT	0x00000100U
+#define EFI_EVT_NOTIFY_SIGNAL	0x00000200U
+
+/*
+ * boottime->wait_for_event takes an array of events as input.
+ * Provide a helper to set it up correctly for mixed mode.
+ */
+static inline
+void efi_set_event_at(efi_event_t *events, size_t idx, efi_event_t event)
+{
+	if (efi_is_native())
+		events[idx] = event;
+	else
+		((u32 *)events)[idx] = (u32)(unsigned long)event;
+}
+
+#define EFI_TPL_APPLICATION	4
+#define EFI_TPL_CALLBACK	8
+#define EFI_TPL_NOTIFY		16
+#define EFI_TPL_HIGH_LEVEL	31
+
+typedef enum {
+	EfiTimerCancel,
+	EfiTimerPeriodic,
+	EfiTimerRelative
+} EFI_TIMER_DELAY;
+
 /*
  * EFI Boot Services table
  */
@@ -144,11 +199,16 @@ union efi_boot_services {
 		efi_status_t (__efiapi *allocate_pool)(int, unsigned long,
 						       void **);
 		efi_status_t (__efiapi *free_pool)(void *);
-		void *create_event;
-		void *set_timer;
-		void *wait_for_event;
+		efi_status_t (__efiapi *create_event)(u32, unsigned long,
+						      efi_event_notify_t, void *,
+						      efi_event_t *);
+		efi_status_t (__efiapi *set_timer)(efi_event_t,
+						  EFI_TIMER_DELAY, u64);
+		efi_status_t (__efiapi *wait_for_event)(unsigned long,
+							efi_event_t *,
+							unsigned long *);
 		void *signal_event;
-		void *close_event;
+		efi_status_t (__efiapi *close_event)(efi_event_t);
 		void *check_event;
 		void *install_protocol_interface;
 		void *reinstall_protocol_interface;
@@ -175,7 +235,7 @@ union efi_boot_services {
 		efi_status_t (__efiapi *exit_boot_services)(efi_handle_t,
 							    unsigned long);
 		void *get_next_monotonic_count;
-		void *stall;
+		efi_status_t (__efiapi *stall)(unsigned long);
 		void *set_watchdog_timer;
 		void *connect_controller;
 		efi_status_t (__efiapi *disconnect_controller)(efi_handle_t,
@@ -260,6 +320,27 @@ union efi_uga_draw_protocol {
 	} mixed_mode;
 };
 
+typedef struct {
+	u16 scan_code;
+	efi_char16_t unicode_char;
+} efi_input_key_t;
+
+union efi_simple_text_input_protocol {
+	struct {
+		void *reset;
+		efi_status_t (__efiapi *read_keystroke)(efi_simple_text_input_protocol_t *,
+							efi_input_key_t *);
+		efi_event_t wait_for_key;
+	};
+	struct {
+		u32 reset;
+		u32 read_keystroke;
+		u32 wait_for_key;
+	} mixed_mode;
+};
+
+efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key);
+
 union efi_simple_text_output_protocol {
 	struct {
 		void *reset;
@@ -612,8 +693,6 @@ efi_status_t efi_exit_boot_services(void *handle,
 				    void *priv,
 				    efi_exit_boot_map_processing priv_func);
 
-void efi_char16_printk(efi_char16_t *);
-
 efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
 					    unsigned long *new_fdt_addr,
 					    unsigned long max_addr,
@@ -637,12 +716,15 @@ efi_status_t check_platform_features(void);
 
 void *get_efi_config_table(efi_guid_t guid);
 
-void efi_printk(char *str);
+/* NOTE: These functions do not print a trailing newline after the string */
+void efi_char16_puts(efi_char16_t *);
+void efi_puts(const char *str);
+
+__printf(1, 2) int efi_printk(char const *fmt, ...);
 
 void efi_free(unsigned long size, unsigned long addr);
 
-char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len,
-			  unsigned long max_addr);
+char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len);
 
 efi_status_t efi_get_memory_map(struct efi_boot_memmap *map);
 
@@ -683,21 +765,10 @@ static inline efi_status_t efi_load_dtb(efi_loaded_image_t *image,
 				    ULONG_MAX, ULONG_MAX, load_addr, load_size);
 }
 
-static inline efi_status_t efi_load_initrd(efi_loaded_image_t *image,
-					   unsigned long *load_addr,
-					   unsigned long *load_size,
-					   unsigned long soft_limit,
-					   unsigned long hard_limit)
-{
-	if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER))
-		return EFI_SUCCESS;
-
-	return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
-				    soft_limit, hard_limit, load_addr, load_size);
-}
-
-efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
-				      unsigned long *load_size,
-				      unsigned long max);
+efi_status_t efi_load_initrd(efi_loaded_image_t *image,
+			     unsigned long *load_addr,
+			     unsigned long *load_size,
+			     unsigned long soft_limit,
+			     unsigned long hard_limit);
 
 #endif

drivers/firmware/efi/libstub/fdt.c

@@ -39,7 +39,7 @@ static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size,
 	/* Do some checks on provided FDT, if it exists: */
 	if (orig_fdt) {
 		if (fdt_check_header(orig_fdt)) {
-			pr_efi_err("Device Tree header not valid!\n");
+			efi_err("Device Tree header not valid!\n");
 			return EFI_LOAD_ERROR;
 		}
 		/*
@@ -47,7 +47,7 @@ static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size,
 		 * configuration table:
 		 */
 		if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
-			pr_efi_err("Truncated device tree! foo!\n");
+			efi_err("Truncated device tree! foo!\n");
 			return EFI_LOAD_ERROR;
 		}
 	}
@@ -270,16 +270,16 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
 	 */
 	status = efi_get_memory_map(&map);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Unable to retrieve UEFI memory map.\n");
+		efi_err("Unable to retrieve UEFI memory map.\n");
 		return status;
 	}
 
-	pr_efi("Exiting boot services and installing virtual address map...\n");
+	efi_info("Exiting boot services and installing virtual address map...\n");
 
 	map.map = &memory_map;
 	status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, max_addr);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Unable to allocate memory for new device tree.\n");
+		efi_err("Unable to allocate memory for new device tree.\n");
 		goto fail;
 	}
 
@@ -296,7 +296,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
 			    initrd_addr, initrd_size);
 
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Unable to construct new device tree.\n");
+		efi_err("Unable to construct new device tree.\n");
 		goto fail_free_new_fdt;
 	}
 
@@ -342,7 +342,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
 		return EFI_SUCCESS;
 	}
 
-	pr_efi_err("Exit boot services failed.\n");
+	efi_err("Exit boot services failed.\n");
 
 fail_free_new_fdt:
 	efi_free(MAX_FDT_SIZE, *new_fdt_addr);
@@ -363,7 +363,7 @@ void *get_fdt(unsigned long *fdt_size)
 		return NULL;
 
 	if (fdt_check_header(fdt) != 0) {
-		pr_efi_err("Invalid header detected on UEFI supplied FDT, ignoring ...\n");
+		efi_err("Invalid header detected on UEFI supplied FDT, ignoring ...\n");
 		return NULL;
 	}
 	*fdt_size = fdt_totalsize(fdt);

drivers/firmware/efi/libstub/file.c

@@ -46,16 +46,14 @@ static efi_status_t efi_open_file(efi_file_protocol_t *volume,
 
 	status = volume->open(volume, &fh, fi->filename, EFI_FILE_MODE_READ, 0);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to open file: ");
-		efi_char16_printk(fi->filename);
-		efi_printk("\n");
+		efi_err("Failed to open file: %ls\n", fi->filename);
 		return status;
 	}
 
 	info_sz = sizeof(struct finfo);
 	status = fh->get_info(fh, &info_guid, &info_sz, fi);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to get file info\n");
+		efi_err("Failed to get file info\n");
 		fh->close(fh);
 		return status;
 	}
@@ -75,13 +73,13 @@ static efi_status_t efi_open_volume(efi_loaded_image_t *image,
 	status = efi_bs_call(handle_protocol, image->device_handle, &fs_proto,
 			     (void **)&io);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to handle fs_proto\n");
+		efi_err("Failed to handle fs_proto\n");
 		return status;
 	}
 
 	status = io->open_volume(io, fh);
 	if (status != EFI_SUCCESS)
-		pr_efi_err("Failed to open volume\n");
+		efi_err("Failed to open volume\n");
 
 	return status;
 }
@@ -191,7 +189,7 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
 							    &alloc_addr,
 							    hard_limit);
 			if (status != EFI_SUCCESS) {
-				pr_efi_err("Failed to allocate memory for files\n");
+				efi_err("Failed to allocate memory for files\n");
 				goto err_close_file;
 			}
 
@@ -215,7 +213,7 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
 
 			status = file->read(file, &chunksize, addr);
 			if (status != EFI_SUCCESS) {
-				pr_efi_err("Failed to read file\n");
+				efi_err("Failed to read file\n");
 				goto err_close_file;
 			}
 			addr += chunksize;

drivers/firmware/efi/libstub/gop.c

@@ -19,7 +19,8 @@ enum efi_cmdline_option {
 	EFI_CMDLINE_NONE,
 	EFI_CMDLINE_MODE_NUM,
 	EFI_CMDLINE_RES,
-	EFI_CMDLINE_AUTO
+	EFI_CMDLINE_AUTO,
+	EFI_CMDLINE_LIST
 };
 
 static struct {
@@ -100,6 +101,19 @@ static bool parse_auto(char *option, char **next)
 	return true;
 }
 
+static bool parse_list(char *option, char **next)
+{
+	if (!strstarts(option, "list"))
+		return false;
+	option += strlen("list");
+	if (*option && *option++ != ',')
+		return false;
+	cmdline.option = EFI_CMDLINE_LIST;
+
+	*next = option;
+	return true;
+}
+
 void efi_parse_option_graphics(char *option)
 {
 	while (*option) {
@@ -109,6 +123,8 @@ void efi_parse_option_graphics(char *option)
 			continue;
 		if (parse_auto(option, &option))
 			continue;
+		if (parse_list(option, &option))
+			continue;
 
 		while (*option && *option++ != ',')
 			;
@@ -134,14 +150,14 @@ static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
 
 	max_mode = efi_table_attr(mode, max_mode);
 	if (cmdline.mode >= max_mode) {
-		efi_printk("Requested mode is invalid\n");
+		efi_err("Requested mode is invalid\n");
 		return cur_mode;
 	}
 
 	status = efi_call_proto(gop, query_mode, cmdline.mode,
 				&info_size, &info);
 	if (status != EFI_SUCCESS) {
-		efi_printk("Couldn't get mode information\n");
+		efi_err("Couldn't get mode information\n");
 		return cur_mode;
 	}
 
@@ -150,7 +166,7 @@ static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
 	efi_bs_call(free_pool, info);
 
 	if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) {
-		efi_printk("Invalid PixelFormat\n");
+		efi_err("Invalid PixelFormat\n");
 		return cur_mode;
 	}
 
@@ -222,7 +238,7 @@ static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
 			return m;
 	}
 
-	efi_printk("Couldn't find requested mode\n");
+	efi_err("Couldn't find requested mode\n");
 
 	return cur_mode;
 }
@@ -290,6 +306,82 @@ static u32 choose_mode_auto(efi_graphics_output_protocol_t *gop)
 	return best_mode;
 }
 
+static u32 choose_mode_list(efi_graphics_output_protocol_t *gop)
+{
+	efi_status_t status;
+
+	efi_graphics_output_protocol_mode_t *mode;
+	efi_graphics_output_mode_info_t *info;
+	unsigned long info_size;
+
+	u32 max_mode, cur_mode;
+	int pf;
+	efi_pixel_bitmask_t pi;
+	u32 m, w, h;
+	u8 d;
+	const char *dstr;
+	bool valid;
+	efi_input_key_t key;
+
+	mode = efi_table_attr(gop, mode);
+
+	cur_mode = efi_table_attr(mode, mode);
+	max_mode = efi_table_attr(mode, max_mode);
+
+	efi_printk("Available graphics modes are 0-%u\n", max_mode-1);
+	efi_puts("  * = current mode\n"
+		 "  - = unusable mode\n");
+	for (m = 0; m < max_mode; m++) {
+		status = efi_call_proto(gop, query_mode, m,
+					&info_size, &info);
+		if (status != EFI_SUCCESS)
+			continue;
+
+		pf = info->pixel_format;
+		pi = info->pixel_information;
+		w  = info->horizontal_resolution;
+		h  = info->vertical_resolution;
+
+		efi_bs_call(free_pool, info);
+
+		valid = !(pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX);
+		d = 0;
+		switch (pf) {
+		case PIXEL_RGB_RESERVED_8BIT_PER_COLOR:
+			dstr = "rgb";
+			break;
+		case PIXEL_BGR_RESERVED_8BIT_PER_COLOR:
+			dstr = "bgr";
+			break;
+		case PIXEL_BIT_MASK:
+			dstr = "";
+			d = pixel_bpp(pf, pi);
+			break;
+		case PIXEL_BLT_ONLY:
+			dstr = "blt";
+			break;
+		default:
+			dstr = "xxx";
+			break;
+		}
+
+		efi_printk("Mode %3u %c%c: Resolution %ux%u-%s%.0hhu\n",
+			   m,
+			   m == cur_mode ? '*' : ' ',
+			   !valid ? '-' : ' ',
+			   w, h, dstr, d);
+	}
+
+	efi_puts("\nPress any key to continue (or wait 10 seconds)\n");
+	status = efi_wait_for_key(10 * EFI_USEC_PER_SEC, &key);
+	if (status != EFI_SUCCESS && status != EFI_TIMEOUT) {
+		efi_err("Unable to read key, continuing in 10 seconds\n");
+		efi_bs_call(stall, 10 * EFI_USEC_PER_SEC);
+	}
+
+	return cur_mode;
+}
+
 static void set_mode(efi_graphics_output_protocol_t *gop)
 {
 	efi_graphics_output_protocol_mode_t *mode;
@@ -305,6 +397,9 @@ static void set_mode(efi_graphics_output_protocol_t *gop)
 	case EFI_CMDLINE_AUTO:
 		new_mode = choose_mode_auto(gop);
 		break;
+	case EFI_CMDLINE_LIST:
+		new_mode = choose_mode_list(gop);
+		break;
 	default:
 		return;
 	}
@@ -316,7 +411,7 @@ static void set_mode(efi_graphics_output_protocol_t *gop)
 		return;
 
 	if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
-		efi_printk("Failed to set requested mode\n");
+		efi_err("Failed to set requested mode\n");
 }
 
 static void find_bits(u32 mask, u8 *pos, u8 *size)
@@ -422,7 +517,6 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
 	efi_graphics_output_protocol_t *gop;
 	efi_graphics_output_protocol_mode_t *mode;
 	efi_graphics_output_mode_info_t *info;
-	efi_physical_addr_t fb_base;
 
 	gop = find_gop(proto, size, handles);
 
@@ -442,9 +536,8 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
 	si->lfb_width  = info->horizontal_resolution;
 	si->lfb_height = info->vertical_resolution;
 
-	fb_base		 = efi_table_attr(mode, frame_buffer_base);
-	si->lfb_base	 = lower_32_bits(fb_base);
-	si->ext_lfb_base = upper_32_bits(fb_base);
+	efi_set_u64_split(efi_table_attr(mode, frame_buffer_base),
+			  &si->lfb_base, &si->ext_lfb_base);
 	if (si->ext_lfb_base)
 		si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 

drivers/firmware/efi/libstub/pci.c

@@ -28,21 +28,21 @@ void efi_pci_disable_bridge_busmaster(void)
 
 	if (status != EFI_BUFFER_TOO_SMALL) {
 		if (status != EFI_SUCCESS && status != EFI_NOT_FOUND)
-			pr_efi_err("Failed to locate PCI I/O handles'\n");
+			efi_err("Failed to locate PCI I/O handles'\n");
 		return;
 	}
 
 	status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, pci_handle_size,
 			     (void **)&pci_handle);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to allocate memory for 'pci_handle'\n");
+		efi_err("Failed to allocate memory for 'pci_handle'\n");
 		return;
 	}
 
 	status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 			     NULL, &pci_handle_size, pci_handle);
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to locate PCI I/O handles'\n");
+		efi_err("Failed to locate PCI I/O handles'\n");
 		goto free_handle;
 	}
 
@@ -69,7 +69,7 @@ void efi_pci_disable_bridge_busmaster(void)
 		 * access to the framebuffer. Drivers for true PCIe graphics
 		 * controllers that are behind a PCIe root port do not use
 		 * DMA to implement the GOP framebuffer anyway [although they
-		 * may use it in their implentation of Gop->Blt()], and so
+		 * may use it in their implementation of Gop->Blt()], and so
 		 * disabling DMA in the PCI bridge should not interfere with
 		 * normal operation of the device.
 		 */
@@ -106,7 +106,7 @@ void efi_pci_disable_bridge_busmaster(void)
 		status = efi_call_proto(pci, pci.write, EfiPciIoWidthUint16,
 					PCI_COMMAND, 1, &command);
 		if (status != EFI_SUCCESS)
-			pr_efi_err("Failed to disable PCI busmastering\n");
+			efi_err("Failed to disable PCI busmastering\n");
 	}
 
 free_handle:

drivers/firmware/efi/libstub/relocate.c

@@ -140,7 +140,7 @@ efi_status_t efi_relocate_kernel(unsigned long *image_addr,
 	 * The EFI firmware loader could have placed the kernel image
 	 * anywhere in memory, but the kernel has restrictions on the
 	 * max physical address it can run at.  Some architectures
-	 * also have a prefered address, so first try to relocate
+	 * also have a preferred address, so first try to relocate
 	 * to the preferred address.  If that fails, allocate as low
 	 * as possible while respecting the required alignment.
 	 */
@@ -157,7 +157,7 @@ efi_status_t efi_relocate_kernel(unsigned long *image_addr,
 					     min_addr);
 	}
 	if (status != EFI_SUCCESS) {
-		pr_efi_err("Failed to allocate usable memory for kernel.\n");
+		efi_err("Failed to allocate usable memory for kernel.\n");
 		return status;
 	}
 

drivers/firmware/efi/libstub/secureboot.c

@@ -67,10 +67,10 @@ enum efi_secureboot_mode efi_get_secureboot(void)
 		return efi_secureboot_mode_disabled;
 
 secure_boot_enabled:
-	pr_efi("UEFI Secure Boot is enabled.\n");
+	efi_info("UEFI Secure Boot is enabled.\n");
 	return efi_secureboot_mode_enabled;
 
 out_efi_err:
-	pr_efi_err("Could not determine UEFI Secure Boot status.\n");
+	efi_err("Could not determine UEFI Secure Boot status.\n");
 	return efi_secureboot_mode_unknown;
 }

drivers/firmware/efi/libstub/tpm.c

@@ -119,7 +119,7 @@ void efi_retrieve_tpm2_eventlog(void)
 			     sizeof(*log_tbl) + log_size, (void **)&log_tbl);
 
 	if (status != EFI_SUCCESS) {
-		efi_printk("Unable to allocate memory for event log\n");
+		efi_err("Unable to allocate memory for event log\n");
 		return;
 	}
 

drivers/firmware/efi/libstub/vsprintf.c

+// SPDX-License-Identifier: GPL-2.0-only
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * Oh, it's a waste of space, but oh-so-yummy for debugging.
+ */
+
+#include <stdarg.h>
+
+#include <linux/compiler.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+static
+int skip_atoi(const char **s)
+{
+	int i = 0;
+
+	while (isdigit(**s))
+		i = i * 10 + *((*s)++) - '0';
+	return i;
+}
+
+/*
+ * put_dec_full4 handles numbers in the range 0 <= r < 10000.
+ * The multiplier 0xccd is round(2^15/10), and the approximation
+ * r/10 == (r * 0xccd) >> 15 is exact for all r < 16389.
+ */
+static
+void put_dec_full4(char *end, unsigned int r)
+{
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		unsigned int q = (r * 0xccd) >> 15;
+		*--end = '0' + (r - q * 10);
+		r = q;
+	}
+	*--end = '0' + r;
+}
+
+/* put_dec is copied from lib/vsprintf.c with small modifications */
+
+/*
+ * Call put_dec_full4 on x % 10000, return x / 10000.
+ * The approximation x/10000 == (x * 0x346DC5D7) >> 43
+ * holds for all x < 1,128,869,999.  The largest value this
+ * helper will ever be asked to convert is 1,125,520,955.
+ * (second call in the put_dec code, assuming n is all-ones).
+ */
+static
+unsigned int put_dec_helper4(char *end, unsigned int x)
+{
+	unsigned int q = (x * 0x346DC5D7ULL) >> 43;
+
+	put_dec_full4(end, x - q * 10000);
+	return q;
+}
+
+/* Based on code by Douglas W. Jones found at
+ * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
+ * (with permission from the author).
+ * Performs no 64-bit division and hence should be fast on 32-bit machines.
+ */
+static
+char *put_dec(char *end, unsigned long long n)
+{
+	unsigned int d3, d2, d1, q, h;
+	char *p = end;
+
+	d1  = ((unsigned int)n >> 16); /* implicit "& 0xffff" */
+	h   = (n >> 32);
+	d2  = (h      ) & 0xffff;
+	d3  = (h >> 16); /* implicit "& 0xffff" */
+
+	/* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
+	     = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
+	q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((unsigned int)n & 0xffff);
+	q = put_dec_helper4(p, q);
+	p -= 4;
+
+	q += 7671 * d3 + 9496 * d2 + 6 * d1;
+	q = put_dec_helper4(p, q);
+	p -= 4;
+
+	q += 4749 * d3 + 42 * d2;
+	q = put_dec_helper4(p, q);
+	p -= 4;
+
+	q += 281 * d3;
+	q = put_dec_helper4(p, q);
+	p -= 4;
+
+	put_dec_full4(p, q);
+	p -= 4;
+
+	/* strip off the extra 0's we printed */
+	while (p < end && *p == '0')
+		++p;
+
+	return p;
+}
+
+static
+char *number(char *end, unsigned long long num, int base, char locase)
+{
+	/*
+	 * locase = 0 or 0x20. ORing digits or letters with 'locase'
+	 * produces same digits or (maybe lowercased) letters
+	 */
+
+	/* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
+	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
+
+	switch (base) {
+	case 10:
+		if (num != 0)
+			end = put_dec(end, num);
+		break;
+	case 8:
+		for (; num != 0; num >>= 3)
+			*--end = '0' + (num & 07);
+		break;
+	case 16:
+		for (; num != 0; num >>= 4)
+			*--end = digits[num & 0xf] | locase;
+		break;
+	default:
+		unreachable();
+	};
+
+	return end;
+}
+
+#define ZEROPAD	1		/* pad with zero */
+#define SIGN	2		/* unsigned/signed long */
+#define PLUS	4		/* show plus */
+#define SPACE	8		/* space if plus */
+#define LEFT	16		/* left justified */
+#define SMALL	32		/* Must be 32 == 0x20 */
+#define SPECIAL	64		/* 0x */
+#define WIDE	128		/* UTF-16 string */
+
+static
+int get_flags(const char **fmt)
+{
+	int flags = 0;
+
+	do {
+		switch (**fmt) {
+		case '-':
+			flags |= LEFT;
+			break;
+		case '+':
+			flags |= PLUS;
+			break;
+		case ' ':
+			flags |= SPACE;
+			break;
+		case '#':
+			flags |= SPECIAL;
+			break;
+		case '0':
+			flags |= ZEROPAD;
+			break;
+		default:
+			return flags;
+		}
+		++(*fmt);
+	} while (1);
+}
+
+static
+int get_int(const char **fmt, va_list *ap)
+{
+	if (isdigit(**fmt))
+		return skip_atoi(fmt);
+	if (**fmt == '*') {
+		++(*fmt);
+		/* it's the next argument */
+		return va_arg(*ap, int);
+	}
+	return 0;
+}
+
+static
+unsigned long long get_number(int sign, int qualifier, va_list *ap)
+{
+	if (sign) {
+		switch (qualifier) {
+		case 'L':
+			return va_arg(*ap, long long);
+		case 'l':
+			return va_arg(*ap, long);
+		case 'h':
+			return (short)va_arg(*ap, int);
+		case 'H':
+			return (signed char)va_arg(*ap, int);
+		default:
+			return va_arg(*ap, int);
+		};
+	} else {
+		switch (qualifier) {
+		case 'L':
+			return va_arg(*ap, unsigned long long);
+		case 'l':
+			return va_arg(*ap, unsigned long);
+		case 'h':
+			return (unsigned short)va_arg(*ap, int);
+		case 'H':
+			return (unsigned char)va_arg(*ap, int);
+		default:
+			return va_arg(*ap, unsigned int);
+		}
+	}
+}
+
+static
+char get_sign(long long *num, int flags)
+{
+	if (!(flags & SIGN))
+		return 0;
+	if (*num < 0) {
+		*num = -(*num);
+		return '-';
+	}
+	if (flags & PLUS)
+		return '+';
+	if (flags & SPACE)
+		return ' ';
+	return 0;
+}
+
+static
+size_t utf16s_utf8nlen(const u16 *s16, size_t maxlen)
+{
+	size_t len, clen;
+
+	for (len = 0; len < maxlen && *s16; len += clen) {
+		u16 c0 = *s16++;
+
+		/* First, get the length for a BMP character */
+		clen = 1 + (c0 >= 0x80) + (c0 >= 0x800);
+		if (len + clen > maxlen)
+			break;
+		/*
+		 * If this is a high surrogate, and we're already at maxlen, we
+		 * can't include the character if it's a valid surrogate pair.
+		 * Avoid accessing one extra word just to check if it's valid
+		 * or not.
+		 */
+		if ((c0 & 0xfc00) == 0xd800) {
+			if (len + clen == maxlen)
+				break;
+			if ((*s16 & 0xfc00) == 0xdc00) {
+				++s16;
+				++clen;
+			}
+		}
+	}
+
+	return len;
+}
+
+static
+u32 utf16_to_utf32(const u16 **s16)
+{
+	u16 c0, c1;
+
+	c0 = *(*s16)++;
+	/* not a surrogate */
+	if ((c0 & 0xf800) != 0xd800)
+		return c0;
+	/* invalid: low surrogate instead of high */
+	if (c0 & 0x0400)
+		return 0xfffd;
+	c1 = **s16;
+	/* invalid: missing low surrogate */
+	if ((c1 & 0xfc00) != 0xdc00)
+		return 0xfffd;
+	/* valid surrogate pair */
+	++(*s16);
+	return (0x10000 - (0xd800 << 10) - 0xdc00) + (c0 << 10) + c1;
+}
+
+#define PUTC(c) \
+do {				\
+	if (pos < size)		\
+		buf[pos] = (c);	\
+	++pos;			\
+} while (0);
+
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
+{
+	/* The maximum space required is to print a 64-bit number in octal */
+	char tmp[(sizeof(unsigned long long) * 8 + 2) / 3];
+	char *tmp_end = &tmp[ARRAY_SIZE(tmp)];
+	long long num;
+	int base;
+	const char *s;
+	size_t len, pos;
+	char sign;
+
+	int flags;		/* flags to number() */
+
+	int field_width;	/* width of output field */
+	int precision;		/* min. # of digits for integers; max
+				   number of chars for from string */
+	int qualifier;		/* 'h', 'hh', 'l' or 'll' for integer fields */
+
+	va_list args;
+
+	/*
+	 * We want to pass our input va_list to helper functions by reference,
+	 * but there's an annoying edge case. If va_list was originally passed
+	 * to us by value, we could just pass &ap down to the helpers. This is
+	 * the case on, for example, X86_32.
+	 * However, on X86_64 (and possibly others), va_list is actually a
+	 * size-1 array containing a structure. Our function parameter ap has
+	 * decayed from T[1] to T*, and &ap has type T** rather than T(*)[1],
+	 * which is what will be expected by a function taking a va_list *
+	 * parameter.
+	 * One standard way to solve this mess is by creating a copy in a local
+	 * variable of type va_list and then passing a pointer to that local
+	 * copy instead, which is what we do here.
+	 */
+	va_copy(args, ap);
+
+	for (pos = 0; *fmt; ++fmt) {
+		if (*fmt != '%' || *++fmt == '%') {
+			PUTC(*fmt);
+			continue;
+		}
+
+		/* process flags */
+		flags = get_flags(&fmt);
+
+		/* get field width */
+		field_width = get_int(&fmt, &args);
+		if (field_width < 0) {
+			field_width = -field_width;
+			flags |= LEFT;
+		}
+
+		if (flags & LEFT)
+			flags &= ~ZEROPAD;
+
+		/* get the precision */
+		precision = -1;
+		if (*fmt == '.') {
+			++fmt;
+			precision = get_int(&fmt, &args);
+			if (precision >= 0)
+				flags &= ~ZEROPAD;
+		}
+
+		/* get the conversion qualifier */
+		qualifier = -1;
+		if (*fmt == 'h' || *fmt == 'l') {
+			qualifier = *fmt;
+			++fmt;
+			if (qualifier == *fmt) {
+				qualifier -= 'a'-'A';
+				++fmt;
+			}
+		}
+
+		sign = 0;
+
+		switch (*fmt) {
+		case 'c':
+			flags &= LEFT;
+			s = tmp;
+			if (qualifier == 'l') {
+				((u16 *)tmp)[0] = (u16)va_arg(args, unsigned int);
+				((u16 *)tmp)[1] = L'\0';
+				precision = INT_MAX;
+				goto wstring;
+			} else {
+				tmp[0] = (unsigned char)va_arg(args, int);
+				precision = len = 1;
+			}
+			goto output;
+
+		case 's':
+			flags &= LEFT;
+			if (precision < 0)
+				precision = INT_MAX;
+			s = va_arg(args, void *);
+			if (!s)
+				s = precision < 6 ? "" : "(null)";
+			else if (qualifier == 'l') {
+		wstring:
+				flags |= WIDE;
+				precision = len = utf16s_utf8nlen((const u16 *)s, precision);
+				goto output;
+			}
+			precision = len = strnlen(s, precision);
+			goto output;
+
+			/* integer number formats - set up the flags and "break" */
+		case 'o':
+			base = 8;
+			break;
+
+		case 'p':
+			if (precision < 0)
+				precision = 2 * sizeof(void *);
+			fallthrough;
+		case 'x':
+			flags |= SMALL;
+			fallthrough;
+		case 'X':
+			base = 16;
+			break;
+
+		case 'd':
+		case 'i':
+			flags |= SIGN;
+			fallthrough;
+		case 'u':
+			flags &= ~SPECIAL;
+			base = 10;
+			break;
+
+		default:
+			/*
+			 * Bail out if the conversion specifier is invalid.
+			 * There's probably a typo in the format string and the
+			 * remaining specifiers are unlikely to match up with
+			 * the arguments.
+			 */
+			goto fail;
+		}
+		if (*fmt == 'p') {
+			num = (unsigned long)va_arg(args, void *);
+		} else {
+			num = get_number(flags & SIGN, qualifier, &args);
+		}
+
+		sign = get_sign(&num, flags);
+		if (sign)
+			--field_width;
+
+		s = number(tmp_end, num, base, flags & SMALL);
+		len = tmp_end - s;
+		/* default precision is 1 */
+		if (precision < 0)
+			precision = 1;
+		/* precision is minimum number of digits to print */
+		if (precision < len)
+			precision = len;
+		if (flags & SPECIAL) {
+			/*
+			 * For octal, a leading 0 is printed only if necessary,
+			 * i.e. if it's not already there because of the
+			 * precision.
+			 */
+			if (base == 8 && precision == len)
+				++precision;
+			/*
+			 * For hexadecimal, the leading 0x is skipped if the
+			 * output is empty, i.e. both the number and the
+			 * precision are 0.
+			 */
+			if (base == 16 && precision > 0)
+				field_width -= 2;
+			else
+				flags &= ~SPECIAL;
+		}
+		/*
+		 * For zero padding, increase the precision to fill the field
+		 * width.
+		 */
+		if ((flags & ZEROPAD) && field_width > precision)
+			precision = field_width;
+
+output:
+		/* Calculate the padding necessary */
+		field_width -= precision;
+		/* Leading padding with ' ' */
+		if (!(flags & LEFT))
+			while (field_width-- > 0)
+				PUTC(' ');
+		/* sign */
+		if (sign)
+			PUTC(sign);
+		/* 0x/0X for hexadecimal */
+		if (flags & SPECIAL) {
+			PUTC('0');
+			PUTC( 'X' | (flags & SMALL));
+		}
+		/* Zero padding and excess precision */
+		while (precision-- > len)
+			PUTC('0');
+		/* Actual output */
+		if (flags & WIDE) {
+			const u16 *ws = (const u16 *)s;
+
+			while (len-- > 0) {
+				u32 c32 = utf16_to_utf32(&ws);
+				u8 *s8;
+				size_t clen;
+
+				if (c32 < 0x80) {
+					PUTC(c32);
+					continue;
+				}
+
+				/* Number of trailing octets */
+				clen = 1 + (c32 >= 0x800) + (c32 >= 0x10000);
+
+				len -= clen;
+				s8 = (u8 *)&buf[pos];
+
+				/* Avoid writing partial character */
+				PUTC('\0');
+				pos += clen;
+				if (pos >= size)
+					continue;
+
+				/* Set high bits of leading octet */
+				*s8 = (0xf00 >> 1) >> clen;
+				/* Write trailing octets in reverse order */
+				for (s8 += clen; clen; --clen, c32 >>= 6)
+					*s8-- = 0x80 | (c32 & 0x3f);
+				/* Set low bits of leading octet */
+				*s8 |= c32;
+			}
+		} else {
+			while (len-- > 0)
+				PUTC(*s++);
+		}
+		/* Trailing padding with ' ' */
+		while (field_width-- > 0)
+			PUTC(' ');
+	}
+fail:
+	va_end(args);
+
+	if (size)
+		buf[min(pos, size-1)] = '\0';
+
+	return pos;
+}
+
+int snprintf(char *buf, size_t size, const char *fmt, ...)
+{
+	va_list args;
+	int i;
+
+	va_start(args, fmt);
+	i = vsnprintf(buf, size, fmt, args);
+	va_end(args);
+	return i;
+}

drivers/firmware/efi/libstub/x86-stub.c

@@ -22,6 +22,7 @@
 
 const efi_system_table_t *efi_system_table;
 extern u32 image_offset;
+static efi_loaded_image_t *image = NULL;
 
 static efi_status_t
 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
@@ -49,7 +50,7 @@ preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
 	status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
 			     (void **)&rom);
 	if (status != EFI_SUCCESS) {
-		efi_printk("Failed to allocate memory for 'rom'\n");
+		efi_err("Failed to allocate memory for 'rom'\n");
 		return status;
 	}
 
@@ -65,7 +66,7 @@ preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
 				PCI_VENDOR_ID, 1, &rom->vendor);
 
 	if (status != EFI_SUCCESS) {
-		efi_printk("Failed to read rom->vendor\n");
+		efi_err("Failed to read rom->vendor\n");
 		goto free_struct;
 	}
 
@@ -73,7 +74,7 @@ preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
 				PCI_DEVICE_ID, 1, &rom->devid);
 
 	if (status != EFI_SUCCESS) {
-		efi_printk("Failed to read rom->devid\n");
+		efi_err("Failed to read rom->devid\n");
 		goto free_struct;
 	}
 
@@ -118,7 +119,7 @@ static void setup_efi_pci(struct boot_params *params)
 				     (void **)&pci_handle);
 
 		if (status != EFI_SUCCESS) {
-			efi_printk("Failed to allocate memory for 'pci_handle'\n");
+			efi_err("Failed to allocate memory for 'pci_handle'\n");
 			return;
 		}
 
@@ -172,7 +173,7 @@ static void retrieve_apple_device_properties(struct boot_params *boot_params)
 		return;
 
 	if (efi_table_attr(p, version) != 0x10000) {
-		efi_printk("Unsupported properties proto version\n");
+		efi_err("Unsupported properties proto version\n");
 		return;
 	}
 
@@ -185,7 +186,7 @@ static void retrieve_apple_device_properties(struct boot_params *boot_params)
 				     size + sizeof(struct setup_data),
 				     (void **)&new);
 		if (status != EFI_SUCCESS) {
-			efi_printk("Failed to allocate memory for 'properties'\n");
+			efi_err("Failed to allocate memory for 'properties'\n");
 			return;
 		}
 
@@ -355,7 +356,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 {
 	struct boot_params *boot_params;
 	struct setup_header *hdr;
-	efi_loaded_image_t *image;
 	void *image_base;
 	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 	int options_size = 0;
@@ -372,20 +372,21 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 
 	status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image);
 	if (status != EFI_SUCCESS) {
-		efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
+		efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 		efi_exit(handle, status);
 	}
 
 	image_base = efi_table_attr(image, image_base);
 	image_offset = (void *)startup_32 - image_base;
 
-	status = efi_allocate_pages(0x4000, (unsigned long *)&boot_params, ULONG_MAX);
+	status = efi_allocate_pages(sizeof(struct boot_params),
+				    (unsigned long *)&boot_params, ULONG_MAX);
 	if (status != EFI_SUCCESS) {
-		efi_printk("Failed to allocate lowmem for boot params\n");
+		efi_err("Failed to allocate lowmem for boot params\n");
 		efi_exit(handle, status);
 	}
 
-	memset(boot_params, 0x0, 0x4000);
+	memset(boot_params, 0x0, sizeof(struct boot_params));
 
 	hdr = &boot_params->hdr;
 
@@ -403,43 +404,21 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 	hdr->type_of_loader = 0x21;
 
 	/* Convert unicode cmdline to ascii */
-	cmdline_ptr = efi_convert_cmdline(image, &options_size, ULONG_MAX);
+	cmdline_ptr = efi_convert_cmdline(image, &options_size);
 	if (!cmdline_ptr)
 		goto fail;
 
-	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
-	/* Fill in upper bits of command line address, NOP on 32 bit  */
-	boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
+	efi_set_u64_split((unsigned long)cmdline_ptr,
+			  &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr);
 
 	hdr->ramdisk_image = 0;
 	hdr->ramdisk_size = 0;
 
-	if (efi_is_native()) {
-		status = efi_parse_options(cmdline_ptr);
-		if (status != EFI_SUCCESS)
-			goto fail2;
-
-		if (!efi_noinitrd) {
-			status = efi_load_initrd(image, &ramdisk_addr,
-						 &ramdisk_size,
-						 hdr->initrd_addr_max,
-						 ULONG_MAX);
-			if (status != EFI_SUCCESS)
-				goto fail2;
-			hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
-			hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
-			boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
-			boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
-		}
-	}
-
 	efi_stub_entry(handle, sys_table_arg, boot_params);
 	/* not reached */
 
-fail2:
-	efi_free(options_size, (unsigned long)cmdline_ptr);
 fail:
-	efi_free(0x4000, (unsigned long)boot_params);
+	efi_free(sizeof(struct boot_params), (unsigned long)boot_params);
 
 	efi_exit(handle, status);
 }
@@ -632,17 +611,14 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
 				   : EFI32_LOADER_SIGNATURE;
 	memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
 
-	p->efi->efi_systab		= (unsigned long)efi_system_table;
+	efi_set_u64_split((unsigned long)efi_system_table,
+			  &p->efi->efi_systab, &p->efi->efi_systab_hi);
 	p->efi->efi_memdesc_size	= *map->desc_size;
 	p->efi->efi_memdesc_version	= *map->desc_ver;
-	p->efi->efi_memmap		= (unsigned long)*map->map;
+	efi_set_u64_split((unsigned long)*map->map,
+			  &p->efi->efi_memmap, &p->efi->efi_memmap_hi);
 	p->efi->efi_memmap_size		= *map->map_size;
 
-#ifdef CONFIG_X86_64
-	p->efi->efi_systab_hi		= (unsigned long)efi_system_table >> 32;
-	p->efi->efi_memmap_hi		= (unsigned long)*map->map >> 32;
-#endif
-
 	return EFI_SUCCESS;
 }
 
@@ -698,7 +674,6 @@ unsigned long efi_main(efi_handle_t handle,
 	unsigned long buffer_start, buffer_end;
 	struct setup_header *hdr = &boot_params->hdr;
 	efi_status_t status;
-	unsigned long cmdline_paddr;
 
 	efi_system_table = sys_table_arg;
 
@@ -746,7 +721,7 @@ unsigned long efi_main(efi_handle_t handle,
 					     hdr->kernel_alignment,
 					     LOAD_PHYSICAL_ADDR);
 		if (status != EFI_SUCCESS) {
-			efi_printk("efi_relocate_kernel() failed!\n");
+			efi_err("efi_relocate_kernel() failed!\n");
 			goto fail;
 		}
 		/*
@@ -757,35 +732,46 @@ unsigned long efi_main(efi_handle_t handle,
 		image_offset = 0;
 	}
 
-	/*
-	 * efi_pe_entry() may have been called before efi_main(), in which
-	 * case this is the second time we parse the cmdline. This is ok,
-	 * parsing the cmdline multiple times does not have side-effects.
-	 */
-	cmdline_paddr = ((u64)hdr->cmd_line_ptr |
-			 ((u64)boot_params->ext_cmd_line_ptr << 32));
-	efi_parse_options((char *)cmdline_paddr);
+#ifdef CONFIG_CMDLINE_BOOL
+	status = efi_parse_options(CONFIG_CMDLINE);
+	if (status != EFI_SUCCESS) {
+		efi_err("Failed to parse options\n");
+		goto fail;
+	}
+#endif
+	if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
+		unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
+					       ((u64)boot_params->ext_cmd_line_ptr << 32));
+		status = efi_parse_options((char *)cmdline_paddr);
+		if (status != EFI_SUCCESS) {
+			efi_err("Failed to parse options\n");
+			goto fail;
+		}
+	}
 
 	/*
-	 * At this point, an initrd may already have been loaded, either by
-	 * the bootloader and passed via bootparams, or loaded from a initrd=
-	 * command line option by efi_pe_entry() above. In either case, we
-	 * permit an initrd loaded from the LINUX_EFI_INITRD_MEDIA_GUID device
-	 * path to supersede it.
+	 * At this point, an initrd may already have been loaded by the
+	 * bootloader and passed via bootparams. We permit an initrd loaded
+	 * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it.
+	 *
+	 * If the device path is not present, any command-line initrd=
+	 * arguments will be processed only if image is not NULL, which will be
+	 * the case only if we were loaded via the PE entry point.
 	 */
 	if (!efi_noinitrd) {
 		unsigned long addr, size;
 
-		status = efi_load_initrd_dev_path(&addr, &size, ULONG_MAX);
-		if (status == EFI_SUCCESS) {
-			hdr->ramdisk_image		= (u32)addr;
-			hdr->ramdisk_size 		= (u32)size;
-			boot_params->ext_ramdisk_image	= (u64)addr >> 32;
-			boot_params->ext_ramdisk_size 	= (u64)size >> 32;
-		} else if (status != EFI_NOT_FOUND) {
-			efi_printk("efi_load_initrd_dev_path() failed!\n");
+		status = efi_load_initrd(image, &addr, &size,
+					 hdr->initrd_addr_max, ULONG_MAX);
+
+		if (status != EFI_SUCCESS) {
+			efi_err("Failed to load initrd!\n");
 			goto fail;
 		}
+		efi_set_u64_split(addr, &hdr->ramdisk_image,
+				  &boot_params->ext_ramdisk_image);
+		efi_set_u64_split(size, &hdr->ramdisk_size,
+				  &boot_params->ext_ramdisk_size);
 	}
 
 	/*
@@ -810,13 +796,13 @@ unsigned long efi_main(efi_handle_t handle,
 
 	status = exit_boot(boot_params, handle);
 	if (status != EFI_SUCCESS) {
-		efi_printk("exit_boot() failed!\n");
+		efi_err("exit_boot() failed!\n");
 		goto fail;
 	}
 
 	return bzimage_addr;
 fail:
-	efi_printk("efi_main() failed!\n");
+	efi_err("efi_main() failed!\n");
 
 	efi_exit(handle, status);
 }

include/linux/efi.h

@@ -39,6 +39,7 @@
 #define EFI_WRITE_PROTECTED	( 8 | (1UL << (BITS_PER_LONG-1)))
 #define EFI_OUT_OF_RESOURCES	( 9 | (1UL << (BITS_PER_LONG-1)))
 #define EFI_NOT_FOUND		(14 | (1UL << (BITS_PER_LONG-1)))
+#define EFI_TIMEOUT		(18 | (1UL << (BITS_PER_LONG-1)))
 #define EFI_ABORTED		(21 | (1UL << (BITS_PER_LONG-1)))
 #define EFI_SECURITY_VIOLATION	(26 | (1UL << (BITS_PER_LONG-1)))
 
@@ -426,6 +427,7 @@ typedef struct {
 	u32 tables;
 } efi_system_table_32_t;
 
+typedef union efi_simple_text_input_protocol efi_simple_text_input_protocol_t;
 typedef union efi_simple_text_output_protocol efi_simple_text_output_protocol_t;
 
 typedef union {
@@ -434,7 +436,7 @@ typedef union {
 		unsigned long fw_vendor;	/* physical addr of CHAR16 vendor string */
 		u32 fw_revision;
 		unsigned long con_in_handle;
-		unsigned long con_in;
+		efi_simple_text_input_protocol_t *con_in;
 		unsigned long con_out_handle;
 		efi_simple_text_output_protocol_t *con_out;
 		unsigned long stderr_handle;