From: Ard Biesheuvel <ardb@kernel.org>
Date: Mon, 10 Feb 2020 17:02:36 +0100
Subject: efi/libstub/x86: Incorporate eboot.c into libstub
Patch-mainline: v5.7-rc1
Git-commit: c2d0b470154c5be39f253da7814742030635f300
References: jsc#SLE-16407
Most of the EFI stub source files of all architectures reside under
drivers/firmware/efi/libstub, where they share a Makefile with special
CFLAGS and an include file with declarations that are only relevant
for stub code.
Currently, we carry a lot of stub specific stuff in linux/efi.h only
because eboot.c in arch/x86 needs them as well. So let's move eboot.c
into libstub/, and move the contents of eboot.h that we still care
about into efistub.h
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
arch/x86/boot/compressed/Makefile | 5
arch/x86/boot/compressed/eboot.c | 777 --------------------------------
arch/x86/boot/compressed/eboot.h | 31 -
drivers/firmware/efi/libstub/Makefile | 1
drivers/firmware/efi/libstub/efistub.h | 16
drivers/firmware/efi/libstub/x86-stub.c | 774 +++++++++++++++++++++++++++++++
6 files changed, 792 insertions(+), 812 deletions(-)
delete mode 100644 arch/x86/boot/compressed/eboot.h
rename arch/x86/boot/compressed/eboot.c => drivers/firmware/efi/libstub/x86-stub.c (99%)
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -86,10 +86,7 @@ endif
vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
-$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
-
-vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o \
- $(objtree)/drivers/firmware/efi/libstub/lib.a
+vmlinux-objs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
# The compressed kernel is built with -fPIC/-fPIE so that a boot loader
--- a/arch/x86/boot/compressed/eboot.c
+++ /dev/null
@@ -1,777 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-
-/* -----------------------------------------------------------------------
- *
- * Copyright 2011 Intel Corporation; author Matt Fleming
- *
- * ----------------------------------------------------------------------- */
-
-#pragma GCC visibility push(hidden)
-
-#include <linux/efi.h>
-#include <linux/pci.h>
-
-#include <asm/efi.h>
-#include <asm/e820/types.h>
-#include <asm/setup.h>
-#include <asm/desc.h>
-#include <asm/boot.h>
-
-#include "../string.h"
-#include "eboot.h"
-
-static efi_system_table_t *sys_table;
-extern const bool efi_is64;
-
-__pure efi_system_table_t *efi_system_table(void)
-{
- return sys_table;
-}
-
-__attribute_const__ bool efi_is_64bit(void)
-{
- if (IS_ENABLED(CONFIG_EFI_MIXED))
- return efi_is64;
- return IS_ENABLED(CONFIG_X86_64);
-}
-
-static efi_status_t
-preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
-{
- struct pci_setup_rom *rom = NULL;
- efi_status_t status;
- unsigned long size;
- uint64_t romsize;
- void *romimage;
-
- /*
- * Some firmware images contain EFI function pointers at the place where
- * the romimage and romsize fields are supposed to be. Typically the EFI
- * code is mapped at high addresses, translating to an unrealistically
- * large romsize. The UEFI spec limits the size of option ROMs to 16
- * MiB so we reject any ROMs over 16 MiB in size to catch this.
- */
- romimage = efi_table_attr(pci, romimage);
- romsize = efi_table_attr(pci, romsize);
- if (!romimage || !romsize || romsize > SZ_16M)
- return EFI_INVALID_PARAMETER;
-
- size = romsize + sizeof(*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");
- return status;
- }
-
- memset(rom, 0, sizeof(*rom));
-
- rom->data.type = SETUP_PCI;
- rom->data.len = size - sizeof(struct setup_data);
- rom->data.next = 0;
- rom->pcilen = pci->romsize;
- *__rom = rom;
-
- status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
- PCI_VENDOR_ID, 1, &rom->vendor);
-
- if (status != EFI_SUCCESS) {
- efi_printk("Failed to read rom->vendor\n");
- goto free_struct;
- }
-
- status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
- PCI_DEVICE_ID, 1, &rom->devid);
-
- if (status != EFI_SUCCESS) {
- efi_printk("Failed to read rom->devid\n");
- goto free_struct;
- }
-
- status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
- &rom->device, &rom->function);
-
- if (status != EFI_SUCCESS)
- goto free_struct;
-
- memcpy(rom->romdata, romimage, romsize);
- return status;
-
-free_struct:
- efi_bs_call(free_pool, rom);
- return status;
-}
-
-/*
- * There's no way to return an informative status from this function,
- * because any analysis (and printing of error messages) needs to be
- * done directly at the EFI function call-site.
- *
- * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
- * just didn't find any PCI devices, but there's no way to tell outside
- * the context of the call.
- */
-static void setup_efi_pci(struct boot_params *params)
-{
- efi_status_t status;
- void **pci_handle = NULL;
- efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
- unsigned long size = 0;
- struct setup_data *data;
- efi_handle_t h;
- int i;
-
- status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- &pci_proto, NULL, &size, pci_handle);
-
- if (status == EFI_BUFFER_TOO_SMALL) {
- status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
- (void **)&pci_handle);
-
- if (status != EFI_SUCCESS) {
- efi_printk("Failed to allocate memory for 'pci_handle'\n");
- return;
- }
-
- status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- &pci_proto, NULL, &size, pci_handle);
- }
-
- if (status != EFI_SUCCESS)
- goto free_handle;
-
- data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
-
- while (data && data->next)
- data = (struct setup_data *)(unsigned long)data->next;
-
- for_each_efi_handle(h, pci_handle, size, i) {
- efi_pci_io_protocol_t *pci = NULL;
- struct pci_setup_rom *rom;
-
- status = efi_bs_call(handle_protocol, h, &pci_proto,
- (void **)&pci);
- if (status != EFI_SUCCESS || !pci)
- continue;
-
- status = preserve_pci_rom_image(pci, &rom);
- if (status != EFI_SUCCESS)
- continue;
-
- if (data)
- data->next = (unsigned long)rom;
- else
- params->hdr.setup_data = (unsigned long)rom;
-
- data = (struct setup_data *)rom;
- }
-
-free_handle:
- efi_bs_call(free_pool, pci_handle);
-}
-
-static void retrieve_apple_device_properties(struct boot_params *boot_params)
-{
- efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
- struct setup_data *data, *new;
- efi_status_t status;
- u32 size = 0;
- apple_properties_protocol_t *p;
-
- status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
- if (status != EFI_SUCCESS)
- return;
-
- if (efi_table_attr(p, version) != 0x10000) {
- efi_printk("Unsupported properties proto version\n");
- return;
- }
-
- efi_call_proto(p, get_all, NULL, &size);
- if (!size)
- return;
-
- do {
- status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
- size + sizeof(struct setup_data),
- (void **)&new);
- if (status != EFI_SUCCESS) {
- efi_printk("Failed to allocate memory for 'properties'\n");
- return;
- }
-
- status = efi_call_proto(p, get_all, new->data, &size);
-
- if (status == EFI_BUFFER_TOO_SMALL)
- efi_bs_call(free_pool, new);
- } while (status == EFI_BUFFER_TOO_SMALL);
-
- new->type = SETUP_APPLE_PROPERTIES;
- new->len = size;
- new->next = 0;
-
- data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
- if (!data) {
- boot_params->hdr.setup_data = (unsigned long)new;
- } else {
- while (data->next)
- data = (struct setup_data *)(unsigned long)data->next;
- data->next = (unsigned long)new;
- }
-}
-
-static const efi_char16_t apple[] = L"Apple";
-
-static void setup_quirks(struct boot_params *boot_params)
-{
- efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
- efi_table_attr(efi_system_table(), fw_vendor);
-
- if (!memcmp(fw_vendor, apple, sizeof(apple))) {
- if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
- retrieve_apple_device_properties(boot_params);
- }
-}
-
-/*
- * See if we have Universal Graphics Adapter (UGA) protocol
- */
-static efi_status_t
-setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
-{
- efi_status_t status;
- u32 width, height;
- void **uga_handle = NULL;
- efi_uga_draw_protocol_t *uga = NULL, *first_uga;
- efi_handle_t handle;
- int i;
-
- status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
- (void **)&uga_handle);
- if (status != EFI_SUCCESS)
- return status;
-
- status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- uga_proto, NULL, &size, uga_handle);
- if (status != EFI_SUCCESS)
- goto free_handle;
-
- height = 0;
- width = 0;
-
- first_uga = NULL;
- for_each_efi_handle(handle, uga_handle, size, i) {
- efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
- u32 w, h, depth, refresh;
- void *pciio;
-
- status = efi_bs_call(handle_protocol, handle, uga_proto,
- (void **)&uga);
- if (status != EFI_SUCCESS)
- continue;
-
- pciio = NULL;
- efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);
-
- status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
- if (status == EFI_SUCCESS && (!first_uga || pciio)) {
- width = w;
- height = h;
-
- /*
- * Once we've found a UGA supporting PCIIO,
- * don't bother looking any further.
- */
- if (pciio)
- break;
-
- first_uga = uga;
- }
- }
-
- if (!width && !height)
- goto free_handle;
-
- /* EFI framebuffer */
- si->orig_video_isVGA = VIDEO_TYPE_EFI;
-
- si->lfb_depth = 32;
- si->lfb_width = width;
- si->lfb_height = height;
-
- si->red_size = 8;
- si->red_pos = 16;
- si->green_size = 8;
- si->green_pos = 8;
- si->blue_size = 8;
- si->blue_pos = 0;
- si->rsvd_size = 8;
- si->rsvd_pos = 24;
-
-free_handle:
- efi_bs_call(free_pool, uga_handle);
-
- return status;
-}
-
-static void setup_graphics(struct boot_params *boot_params)
-{
- efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
- struct screen_info *si;
- efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
- efi_status_t status;
- unsigned long size;
- void **gop_handle = NULL;
- void **uga_handle = NULL;
-
- si = &boot_params->screen_info;
- memset(si, 0, sizeof(*si));
-
- size = 0;
- status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- &graphics_proto, NULL, &size, gop_handle);
- if (status == EFI_BUFFER_TOO_SMALL)
- status = efi_setup_gop(si, &graphics_proto, size);
-
- if (status != EFI_SUCCESS) {
- size = 0;
- status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
- &uga_proto, NULL, &size, uga_handle);
- if (status == EFI_BUFFER_TOO_SMALL)
- setup_uga(si, &uga_proto, size);
- }
-}
-
-void startup_32(struct boot_params *boot_params);
-
-void __noreturn efi_stub_entry(efi_handle_t handle,
- efi_system_table_t *sys_table_arg,
- struct boot_params *boot_params);
-
-/*
- * Because the x86 boot code expects to be passed a boot_params we
- * need to create one ourselves (usually the bootloader would create
- * one for us).
- */
-efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
- efi_system_table_t *sys_table_arg)
-{
- struct boot_params *boot_params;
- struct setup_header *hdr;
- efi_loaded_image_t *image;
- efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
- int options_size = 0;
- efi_status_t status;
- char *cmdline_ptr;
- unsigned long ramdisk_addr;
- unsigned long ramdisk_size;
-
- sys_table = sys_table_arg;
-
- /* Check if we were booted by the EFI firmware */
- if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
- return EFI_INVALID_PARAMETER;
-
- 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");
- return status;
- }
-
- status = efi_low_alloc(0x4000, 1, (unsigned long *)&boot_params);
- if (status != EFI_SUCCESS) {
- efi_printk("Failed to allocate lowmem for boot params\n");
- return status;
- }
-
- memset(boot_params, 0x0, 0x4000);
-
- hdr = &boot_params->hdr;
-
- /* Copy the second sector to boot_params */
- memcpy(&hdr->jump, image->image_base + 512, 512);
-
- /*
- * Fill out some of the header fields ourselves because the
- * EFI firmware loader doesn't load the first sector.
- */
- hdr->root_flags = 1;
- hdr->vid_mode = 0xffff;
- hdr->boot_flag = 0xAA55;
-
- hdr->type_of_loader = 0x21;
-
- /* Convert unicode cmdline to ascii */
- 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;
-
- hdr->ramdisk_image = 0;
- hdr->ramdisk_size = 0;
-
- status = efi_parse_options(cmdline_ptr);
- if (status != EFI_SUCCESS)
- goto fail2;
-
- status = handle_cmdline_files(image,
- (char *)(unsigned long)hdr->cmd_line_ptr,
- "initrd=", hdr->initrd_addr_max,
- &ramdisk_addr, &ramdisk_size);
-
- if (status != EFI_SUCCESS &&
- hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
- efi_printk("Trying to load files to higher address\n");
- status = handle_cmdline_files(image,
- (char *)(unsigned long)hdr->cmd_line_ptr,
- "initrd=", -1UL,
- &ramdisk_addr, &ramdisk_size);
- }
-
- 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, boot_params);
- /* not reached */
-
-fail2:
- efi_free(options_size, hdr->cmd_line_ptr);
-fail:
- efi_free(0x4000, (unsigned long)boot_params);
-
- return status;
-}
-
-static void add_e820ext(struct boot_params *params,
- struct setup_data *e820ext, u32 nr_entries)
-{
- struct setup_data *data;
-
- e820ext->type = SETUP_E820_EXT;
- e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
- e820ext->next = 0;
-
- data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
-
- while (data && data->next)
- data = (struct setup_data *)(unsigned long)data->next;
-
- if (data)
- data->next = (unsigned long)e820ext;
- else
- params->hdr.setup_data = (unsigned long)e820ext;
-}
-
-static efi_status_t
-setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
-{
- struct boot_e820_entry *entry = params->e820_table;
- struct efi_info *efi = ¶ms->efi_info;
- struct boot_e820_entry *prev = NULL;
- u32 nr_entries;
- u32 nr_desc;
- int i;
-
- nr_entries = 0;
- nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
-
- for (i = 0; i < nr_desc; i++) {
- efi_memory_desc_t *d;
- unsigned int e820_type = 0;
- unsigned long m = efi->efi_memmap;
-
-#ifdef CONFIG_X86_64
- m |= (u64)efi->efi_memmap_hi << 32;
-#endif
-
- d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
- switch (d->type) {
- case EFI_RESERVED_TYPE:
- case EFI_RUNTIME_SERVICES_CODE:
- case EFI_RUNTIME_SERVICES_DATA:
- case EFI_MEMORY_MAPPED_IO:
- case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
- case EFI_PAL_CODE:
- e820_type = E820_TYPE_RESERVED;
- break;
-
- case EFI_UNUSABLE_MEMORY:
- e820_type = E820_TYPE_UNUSABLE;
- break;
-
- case EFI_ACPI_RECLAIM_MEMORY:
- e820_type = E820_TYPE_ACPI;
- break;
-
- case EFI_LOADER_CODE:
- case EFI_LOADER_DATA:
- case EFI_BOOT_SERVICES_CODE:
- case EFI_BOOT_SERVICES_DATA:
- case EFI_CONVENTIONAL_MEMORY:
- if (efi_soft_reserve_enabled() &&
- (d->attribute & EFI_MEMORY_SP))
- e820_type = E820_TYPE_SOFT_RESERVED;
- else
- e820_type = E820_TYPE_RAM;
- break;
-
- case EFI_ACPI_MEMORY_NVS:
- e820_type = E820_TYPE_NVS;
- break;
-
- case EFI_PERSISTENT_MEMORY:
- e820_type = E820_TYPE_PMEM;
- break;
-
- default:
- continue;
- }
-
- /* Merge adjacent mappings */
- if (prev && prev->type == e820_type &&
- (prev->addr + prev->size) == d->phys_addr) {
- prev->size += d->num_pages << 12;
- continue;
- }
-
- if (nr_entries == ARRAY_SIZE(params->e820_table)) {
- u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
- sizeof(struct setup_data);
-
- if (!e820ext || e820ext_size < need)
- return EFI_BUFFER_TOO_SMALL;
-
- /* boot_params map full, switch to e820 extended */
- entry = (struct boot_e820_entry *)e820ext->data;
- }
-
- entry->addr = d->phys_addr;
- entry->size = d->num_pages << PAGE_SHIFT;
- entry->type = e820_type;
- prev = entry++;
- nr_entries++;
- }
-
- if (nr_entries > ARRAY_SIZE(params->e820_table)) {
- u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
-
- add_e820ext(params, e820ext, nr_e820ext);
- nr_entries -= nr_e820ext;
- }
-
- params->e820_entries = (u8)nr_entries;
-
- return EFI_SUCCESS;
-}
-
-static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
- u32 *e820ext_size)
-{
- efi_status_t status;
- unsigned long size;
-
- size = sizeof(struct setup_data) +
- sizeof(struct e820_entry) * nr_desc;
-
- if (*e820ext) {
- efi_bs_call(free_pool, *e820ext);
- *e820ext = NULL;
- *e820ext_size = 0;
- }
-
- status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
- (void **)e820ext);
- if (status == EFI_SUCCESS)
- *e820ext_size = size;
-
- return status;
-}
-
-static efi_status_t allocate_e820(struct boot_params *params,
- struct setup_data **e820ext,
- u32 *e820ext_size)
-{
- unsigned long map_size, desc_size, buff_size;
- struct efi_boot_memmap boot_map;
- efi_memory_desc_t *map;
- efi_status_t status;
- __u32 nr_desc;
-
- boot_map.map = ↦
- boot_map.map_size = &map_size;
- boot_map.desc_size = &desc_size;
- boot_map.desc_ver = NULL;
- boot_map.key_ptr = NULL;
- boot_map.buff_size = &buff_size;
-
- status = efi_get_memory_map(&boot_map);
- if (status != EFI_SUCCESS)
- return status;
-
- nr_desc = buff_size / desc_size;
-
- if (nr_desc > ARRAY_SIZE(params->e820_table)) {
- u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);
-
- status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
- if (status != EFI_SUCCESS)
- return status;
- }
-
- return EFI_SUCCESS;
-}
-
-struct exit_boot_struct {
- struct boot_params *boot_params;
- struct efi_info *efi;
-};
-
-static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
- void *priv)
-{
- const char *signature;
- struct exit_boot_struct *p = priv;
-
- signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
- : EFI32_LOADER_SIGNATURE;
- memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
-
- p->efi->efi_systab = (unsigned long)efi_system_table();
- p->efi->efi_memdesc_size = *map->desc_size;
- p->efi->efi_memdesc_version = *map->desc_ver;
- p->efi->efi_memmap = (unsigned long)*map->map;
- 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;
-}
-
-static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
-{
- unsigned long map_sz, key, desc_size, buff_size;
- efi_memory_desc_t *mem_map;
- struct setup_data *e820ext = NULL;
- __u32 e820ext_size = 0;
- efi_status_t status;
- __u32 desc_version;
- struct efi_boot_memmap map;
- struct exit_boot_struct priv;
-
- map.map = &mem_map;
- map.map_size = &map_sz;
- map.desc_size = &desc_size;
- map.desc_ver = &desc_version;
- map.key_ptr = &key;
- map.buff_size = &buff_size;
- priv.boot_params = boot_params;
- priv.efi = &boot_params->efi_info;
-
- status = allocate_e820(boot_params, &e820ext, &e820ext_size);
- if (status != EFI_SUCCESS)
- return status;
-
- /* Might as well exit boot services now */
- status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
- if (status != EFI_SUCCESS)
- return status;
-
- /* Historic? */
- boot_params->alt_mem_k = 32 * 1024;
-
- status = setup_e820(boot_params, e820ext, e820ext_size);
- if (status != EFI_SUCCESS)
- return status;
-
- return EFI_SUCCESS;
-}
-
-/*
- * On success we return a pointer to a boot_params structure, and NULL
- * on failure.
- */
-struct boot_params *efi_main(efi_handle_t handle,
- efi_system_table_t *sys_table_arg,
- struct boot_params *boot_params)
-{
- unsigned long bzimage_addr = (unsigned long)startup_32;
- struct setup_header *hdr = &boot_params->hdr;
- efi_status_t status;
- unsigned long cmdline_paddr;
-
- sys_table = sys_table_arg;
-
- /* Check if we were booted by the EFI firmware */
- if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
- goto fail;
-
- /*
- * If the kernel isn't already loaded at the preferred load
- * address, relocate it.
- */
- if (bzimage_addr != hdr->pref_address) {
- status = efi_relocate_kernel(&bzimage_addr,
- hdr->init_size, hdr->init_size,
- hdr->pref_address,
- hdr->kernel_alignment,
- LOAD_PHYSICAL_ADDR);
- if (status != EFI_SUCCESS) {
- efi_printk("efi_relocate_kernel() failed!\n");
- goto fail;
- }
- }
- hdr->code32_start = (u32)bzimage_addr;
-
- /*
- * make_boot_params() 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);
-
- /*
- * If the boot loader gave us a value for secure_boot then we use that,
- * otherwise we ask the BIOS.
- */
- if (boot_params->secure_boot == efi_secureboot_mode_unset)
- boot_params->secure_boot = efi_get_secureboot();
-
- /* Ask the firmware to clear memory on unclean shutdown */
- efi_enable_reset_attack_mitigation();
-
- efi_random_get_seed();
-
- efi_retrieve_tpm2_eventlog();
-
- setup_graphics(boot_params);
-
- setup_efi_pci(boot_params);
-
- setup_quirks(boot_params);
-
- status = exit_boot(boot_params, handle);
- if (status != EFI_SUCCESS) {
- efi_printk("exit_boot() failed!\n");
- goto fail;
- }
-
- return boot_params;
-fail:
- efi_printk("efi_main() failed!\n");
-
- for (;;)
- asm("hlt");
-}
--- a/arch/x86/boot/compressed/eboot.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef BOOT_COMPRESSED_EBOOT_H
-#define BOOT_COMPRESSED_EBOOT_H
-
-#define SEG_TYPE_DATA (0 << 3)
-#define SEG_TYPE_READ_WRITE (1 << 1)
-#define SEG_TYPE_CODE (1 << 3)
-#define SEG_TYPE_EXEC_READ (1 << 1)
-#define SEG_TYPE_TSS ((1 << 3) | (1 << 0))
-#define SEG_OP_SIZE_32BIT (1 << 0)
-#define SEG_GRANULARITY_4KB (1 << 0)
-
-#define DESC_TYPE_CODE_DATA (1 << 0)
-
-typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t;
-
-union efi_uga_draw_protocol {
- struct {
- efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *,
- u32*, u32*, u32*, u32*);
- void *set_mode;
- void *blt;
- };
- struct {
- u32 get_mode;
- u32 set_mode;
- u32 blt;
- } mixed_mode;
-};
-
-#endif /* BOOT_COMPRESSED_EBOOT_H */
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -54,6 +54,7 @@ lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o
lib-$(CONFIG_ARM) += arm32-stub.o
lib-$(CONFIG_ARM64) += arm64-stub.o
+lib-$(CONFIG_X86) += x86-stub.o
CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -90,4 +90,20 @@ void *get_efi_config_table(efi_guid_t gu
efi_rt_call(set_variable, (efi_char16_t *)(name), \
(efi_guid_t *)(vendor), __VA_ARGS__)
+typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t;
+
+union efi_uga_draw_protocol {
+ struct {
+ efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *,
+ u32*, u32*, u32*, u32*);
+ void *set_mode;
+ void *blt;
+ };
+ struct {
+ u32 get_mode;
+ u32 set_mode;
+ u32 blt;
+ } mixed_mode;
+};
+
#endif
--- /dev/null
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -0,0 +1,774 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* -----------------------------------------------------------------------
+ *
+ * Copyright 2011 Intel Corporation; author Matt Fleming
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <linux/efi.h>
+#include <linux/pci.h>
+
+#include <asm/efi.h>
+#include <asm/e820/types.h>
+#include <asm/setup.h>
+#include <asm/desc.h>
+#include <asm/boot.h>
+
+#include "efistub.h"
+
+static efi_system_table_t *sys_table;
+extern const bool efi_is64;
+
+__pure efi_system_table_t *efi_system_table(void)
+{
+ return sys_table;
+}
+
+__attribute_const__ bool efi_is_64bit(void)
+{
+ if (IS_ENABLED(CONFIG_EFI_MIXED))
+ return efi_is64;
+ return IS_ENABLED(CONFIG_X86_64);
+}
+
+static efi_status_t
+preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
+{
+ struct pci_setup_rom *rom = NULL;
+ efi_status_t status;
+ unsigned long size;
+ uint64_t romsize;
+ void *romimage;
+
+ /*
+ * Some firmware images contain EFI function pointers at the place where
+ * the romimage and romsize fields are supposed to be. Typically the EFI
+ * code is mapped at high addresses, translating to an unrealistically
+ * large romsize. The UEFI spec limits the size of option ROMs to 16
+ * MiB so we reject any ROMs over 16 MiB in size to catch this.
+ */
+ romimage = efi_table_attr(pci, romimage);
+ romsize = efi_table_attr(pci, romsize);
+ if (!romimage || !romsize || romsize > SZ_16M)
+ return EFI_INVALID_PARAMETER;
+
+ size = romsize + sizeof(*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");
+ return status;
+ }
+
+ memset(rom, 0, sizeof(*rom));
+
+ rom->data.type = SETUP_PCI;
+ rom->data.len = size - sizeof(struct setup_data);
+ rom->data.next = 0;
+ rom->pcilen = pci->romsize;
+ *__rom = rom;
+
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_VENDOR_ID, 1, &rom->vendor);
+
+ if (status != EFI_SUCCESS) {
+ efi_printk("Failed to read rom->vendor\n");
+ goto free_struct;
+ }
+
+ status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
+ PCI_DEVICE_ID, 1, &rom->devid);
+
+ if (status != EFI_SUCCESS) {
+ efi_printk("Failed to read rom->devid\n");
+ goto free_struct;
+ }
+
+ status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
+ &rom->device, &rom->function);
+
+ if (status != EFI_SUCCESS)
+ goto free_struct;
+
+ memcpy(rom->romdata, romimage, romsize);
+ return status;
+
+free_struct:
+ efi_bs_call(free_pool, rom);
+ return status;
+}
+
+/*
+ * There's no way to return an informative status from this function,
+ * because any analysis (and printing of error messages) needs to be
+ * done directly at the EFI function call-site.
+ *
+ * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
+ * just didn't find any PCI devices, but there's no way to tell outside
+ * the context of the call.
+ */
+static void setup_efi_pci(struct boot_params *params)
+{
+ efi_status_t status;
+ void **pci_handle = NULL;
+ efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
+ unsigned long size = 0;
+ struct setup_data *data;
+ efi_handle_t h;
+ int i;
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &pci_proto, NULL, &size, pci_handle);
+
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)&pci_handle);
+
+ if (status != EFI_SUCCESS) {
+ efi_printk("Failed to allocate memory for 'pci_handle'\n");
+ return;
+ }
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &pci_proto, NULL, &size, pci_handle);
+ }
+
+ if (status != EFI_SUCCESS)
+ goto free_handle;
+
+ data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
+
+ while (data && data->next)
+ data = (struct setup_data *)(unsigned long)data->next;
+
+ for_each_efi_handle(h, pci_handle, size, i) {
+ efi_pci_io_protocol_t *pci = NULL;
+ struct pci_setup_rom *rom;
+
+ status = efi_bs_call(handle_protocol, h, &pci_proto,
+ (void **)&pci);
+ if (status != EFI_SUCCESS || !pci)
+ continue;
+
+ status = preserve_pci_rom_image(pci, &rom);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ if (data)
+ data->next = (unsigned long)rom;
+ else
+ params->hdr.setup_data = (unsigned long)rom;
+
+ data = (struct setup_data *)rom;
+ }
+
+free_handle:
+ efi_bs_call(free_pool, pci_handle);
+}
+
+static void retrieve_apple_device_properties(struct boot_params *boot_params)
+{
+ efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
+ struct setup_data *data, *new;
+ efi_status_t status;
+ u32 size = 0;
+ apple_properties_protocol_t *p;
+
+ status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
+ if (status != EFI_SUCCESS)
+ return;
+
+ if (efi_table_attr(p, version) != 0x10000) {
+ efi_printk("Unsupported properties proto version\n");
+ return;
+ }
+
+ efi_call_proto(p, get_all, NULL, &size);
+ if (!size)
+ return;
+
+ do {
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
+ size + sizeof(struct setup_data),
+ (void **)&new);
+ if (status != EFI_SUCCESS) {
+ efi_printk("Failed to allocate memory for 'properties'\n");
+ return;
+ }
+
+ status = efi_call_proto(p, get_all, new->data, &size);
+
+ if (status == EFI_BUFFER_TOO_SMALL)
+ efi_bs_call(free_pool, new);
+ } while (status == EFI_BUFFER_TOO_SMALL);
+
+ new->type = SETUP_APPLE_PROPERTIES;
+ new->len = size;
+ new->next = 0;
+
+ data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
+ if (!data) {
+ boot_params->hdr.setup_data = (unsigned long)new;
+ } else {
+ while (data->next)
+ data = (struct setup_data *)(unsigned long)data->next;
+ data->next = (unsigned long)new;
+ }
+}
+
+static const efi_char16_t apple[] = L"Apple";
+
+static void setup_quirks(struct boot_params *boot_params)
+{
+ efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
+ efi_table_attr(efi_system_table(), fw_vendor);
+
+ if (!memcmp(fw_vendor, apple, sizeof(apple))) {
+ if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
+ retrieve_apple_device_properties(boot_params);
+ }
+}
+
+/*
+ * See if we have Universal Graphics Adapter (UGA) protocol
+ */
+static efi_status_t
+setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
+{
+ efi_status_t status;
+ u32 width, height;
+ void **uga_handle = NULL;
+ efi_uga_draw_protocol_t *uga = NULL, *first_uga;
+ efi_handle_t handle;
+ int i;
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)&uga_handle);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ uga_proto, NULL, &size, uga_handle);
+ if (status != EFI_SUCCESS)
+ goto free_handle;
+
+ height = 0;
+ width = 0;
+
+ first_uga = NULL;
+ for_each_efi_handle(handle, uga_handle, size, i) {
+ efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
+ u32 w, h, depth, refresh;
+ void *pciio;
+
+ status = efi_bs_call(handle_protocol, handle, uga_proto,
+ (void **)&uga);
+ if (status != EFI_SUCCESS)
+ continue;
+
+ pciio = NULL;
+ efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);
+
+ status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
+ if (status == EFI_SUCCESS && (!first_uga || pciio)) {
+ width = w;
+ height = h;
+
+ /*
+ * Once we've found a UGA supporting PCIIO,
+ * don't bother looking any further.
+ */
+ if (pciio)
+ break;
+
+ first_uga = uga;
+ }
+ }
+
+ if (!width && !height)
+ goto free_handle;
+
+ /* EFI framebuffer */
+ si->orig_video_isVGA = VIDEO_TYPE_EFI;
+
+ si->lfb_depth = 32;
+ si->lfb_width = width;
+ si->lfb_height = height;
+
+ si->red_size = 8;
+ si->red_pos = 16;
+ si->green_size = 8;
+ si->green_pos = 8;
+ si->blue_size = 8;
+ si->blue_pos = 0;
+ si->rsvd_size = 8;
+ si->rsvd_pos = 24;
+
+free_handle:
+ efi_bs_call(free_pool, uga_handle);
+
+ return status;
+}
+
+static void setup_graphics(struct boot_params *boot_params)
+{
+ efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+ struct screen_info *si;
+ efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
+ efi_status_t status;
+ unsigned long size;
+ void **gop_handle = NULL;
+ void **uga_handle = NULL;
+
+ si = &boot_params->screen_info;
+ memset(si, 0, sizeof(*si));
+
+ size = 0;
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &graphics_proto, NULL, &size, gop_handle);
+ if (status == EFI_BUFFER_TOO_SMALL)
+ status = efi_setup_gop(si, &graphics_proto, size);
+
+ if (status != EFI_SUCCESS) {
+ size = 0;
+ status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
+ &uga_proto, NULL, &size, uga_handle);
+ if (status == EFI_BUFFER_TOO_SMALL)
+ setup_uga(si, &uga_proto, size);
+ }
+}
+
+void startup_32(struct boot_params *boot_params);
+
+void __noreturn efi_stub_entry(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg,
+ struct boot_params *boot_params);
+
+/*
+ * Because the x86 boot code expects to be passed a boot_params we
+ * need to create one ourselves (usually the bootloader would create
+ * one for us).
+ */
+efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg)
+{
+ struct boot_params *boot_params;
+ struct setup_header *hdr;
+ efi_loaded_image_t *image;
+ efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
+ int options_size = 0;
+ efi_status_t status;
+ char *cmdline_ptr;
+ unsigned long ramdisk_addr;
+ unsigned long ramdisk_size;
+
+ sys_table = sys_table_arg;
+
+ /* Check if we were booted by the EFI firmware */
+ if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ return EFI_INVALID_PARAMETER;
+
+ 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");
+ return status;
+ }
+
+ status = efi_low_alloc(0x4000, 1, (unsigned long *)&boot_params);
+ if (status != EFI_SUCCESS) {
+ efi_printk("Failed to allocate lowmem for boot params\n");
+ return status;
+ }
+
+ memset(boot_params, 0x0, 0x4000);
+
+ hdr = &boot_params->hdr;
+
+ /* Copy the second sector to boot_params */
+ memcpy(&hdr->jump, image->image_base + 512, 512);
+
+ /*
+ * Fill out some of the header fields ourselves because the
+ * EFI firmware loader doesn't load the first sector.
+ */
+ hdr->root_flags = 1;
+ hdr->vid_mode = 0xffff;
+ hdr->boot_flag = 0xAA55;
+
+ hdr->type_of_loader = 0x21;
+
+ /* Convert unicode cmdline to ascii */
+ 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;
+
+ hdr->ramdisk_image = 0;
+ hdr->ramdisk_size = 0;
+
+ status = efi_parse_options(cmdline_ptr);
+ if (status != EFI_SUCCESS)
+ goto fail2;
+
+ status = handle_cmdline_files(image,
+ (char *)(unsigned long)hdr->cmd_line_ptr,
+ "initrd=", hdr->initrd_addr_max,
+ &ramdisk_addr, &ramdisk_size);
+
+ if (status != EFI_SUCCESS &&
+ hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
+ efi_printk("Trying to load files to higher address\n");
+ status = handle_cmdline_files(image,
+ (char *)(unsigned long)hdr->cmd_line_ptr,
+ "initrd=", -1UL,
+ &ramdisk_addr, &ramdisk_size);
+ }
+
+ 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, boot_params);
+ /* not reached */
+
+fail2:
+ efi_free(options_size, hdr->cmd_line_ptr);
+fail:
+ efi_free(0x4000, (unsigned long)boot_params);
+
+ return status;
+}
+
+static void add_e820ext(struct boot_params *params,
+ struct setup_data *e820ext, u32 nr_entries)
+{
+ struct setup_data *data;
+
+ e820ext->type = SETUP_E820_EXT;
+ e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
+ e820ext->next = 0;
+
+ data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
+
+ while (data && data->next)
+ data = (struct setup_data *)(unsigned long)data->next;
+
+ if (data)
+ data->next = (unsigned long)e820ext;
+ else
+ params->hdr.setup_data = (unsigned long)e820ext;
+}
+
+static efi_status_t
+setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
+{
+ struct boot_e820_entry *entry = params->e820_table;
+ struct efi_info *efi = ¶ms->efi_info;
+ struct boot_e820_entry *prev = NULL;
+ u32 nr_entries;
+ u32 nr_desc;
+ int i;
+
+ nr_entries = 0;
+ nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
+
+ for (i = 0; i < nr_desc; i++) {
+ efi_memory_desc_t *d;
+ unsigned int e820_type = 0;
+ unsigned long m = efi->efi_memmap;
+
+#ifdef CONFIG_X86_64
+ m |= (u64)efi->efi_memmap_hi << 32;
+#endif
+
+ d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
+ switch (d->type) {
+ case EFI_RESERVED_TYPE:
+ case EFI_RUNTIME_SERVICES_CODE:
+ case EFI_RUNTIME_SERVICES_DATA:
+ case EFI_MEMORY_MAPPED_IO:
+ case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
+ case EFI_PAL_CODE:
+ e820_type = E820_TYPE_RESERVED;
+ break;
+
+ case EFI_UNUSABLE_MEMORY:
+ e820_type = E820_TYPE_UNUSABLE;
+ break;
+
+ case EFI_ACPI_RECLAIM_MEMORY:
+ e820_type = E820_TYPE_ACPI;
+ break;
+
+ case EFI_LOADER_CODE:
+ case EFI_LOADER_DATA:
+ case EFI_BOOT_SERVICES_CODE:
+ case EFI_BOOT_SERVICES_DATA:
+ case EFI_CONVENTIONAL_MEMORY:
+ if (efi_soft_reserve_enabled() &&
+ (d->attribute & EFI_MEMORY_SP))
+ e820_type = E820_TYPE_SOFT_RESERVED;
+ else
+ e820_type = E820_TYPE_RAM;
+ break;
+
+ case EFI_ACPI_MEMORY_NVS:
+ e820_type = E820_TYPE_NVS;
+ break;
+
+ case EFI_PERSISTENT_MEMORY:
+ e820_type = E820_TYPE_PMEM;
+ break;
+
+ default:
+ continue;
+ }
+
+ /* Merge adjacent mappings */
+ if (prev && prev->type == e820_type &&
+ (prev->addr + prev->size) == d->phys_addr) {
+ prev->size += d->num_pages << 12;
+ continue;
+ }
+
+ if (nr_entries == ARRAY_SIZE(params->e820_table)) {
+ u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
+ sizeof(struct setup_data);
+
+ if (!e820ext || e820ext_size < need)
+ return EFI_BUFFER_TOO_SMALL;
+
+ /* boot_params map full, switch to e820 extended */
+ entry = (struct boot_e820_entry *)e820ext->data;
+ }
+
+ entry->addr = d->phys_addr;
+ entry->size = d->num_pages << PAGE_SHIFT;
+ entry->type = e820_type;
+ prev = entry++;
+ nr_entries++;
+ }
+
+ if (nr_entries > ARRAY_SIZE(params->e820_table)) {
+ u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
+
+ add_e820ext(params, e820ext, nr_e820ext);
+ nr_entries -= nr_e820ext;
+ }
+
+ params->e820_entries = (u8)nr_entries;
+
+ return EFI_SUCCESS;
+}
+
+static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
+ u32 *e820ext_size)
+{
+ efi_status_t status;
+ unsigned long size;
+
+ size = sizeof(struct setup_data) +
+ sizeof(struct e820_entry) * nr_desc;
+
+ if (*e820ext) {
+ efi_bs_call(free_pool, *e820ext);
+ *e820ext = NULL;
+ *e820ext_size = 0;
+ }
+
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
+ (void **)e820ext);
+ if (status == EFI_SUCCESS)
+ *e820ext_size = size;
+
+ return status;
+}
+
+static efi_status_t allocate_e820(struct boot_params *params,
+ struct setup_data **e820ext,
+ u32 *e820ext_size)
+{
+ unsigned long map_size, desc_size, buff_size;
+ struct efi_boot_memmap boot_map;
+ efi_memory_desc_t *map;
+ efi_status_t status;
+ __u32 nr_desc;
+
+ boot_map.map = ↦
+ boot_map.map_size = &map_size;
+ boot_map.desc_size = &desc_size;
+ boot_map.desc_ver = NULL;
+ boot_map.key_ptr = NULL;
+ boot_map.buff_size = &buff_size;
+
+ status = efi_get_memory_map(&boot_map);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ nr_desc = buff_size / desc_size;
+
+ if (nr_desc > ARRAY_SIZE(params->e820_table)) {
+ u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);
+
+ status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
+ }
+
+ return EFI_SUCCESS;
+}
+
+struct exit_boot_struct {
+ struct boot_params *boot_params;
+ struct efi_info *efi;
+};
+
+static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
+ void *priv)
+{
+ const char *signature;
+ struct exit_boot_struct *p = priv;
+
+ signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
+ : EFI32_LOADER_SIGNATURE;
+ memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
+
+ p->efi->efi_systab = (unsigned long)efi_system_table();
+ p->efi->efi_memdesc_size = *map->desc_size;
+ p->efi->efi_memdesc_version = *map->desc_ver;
+ p->efi->efi_memmap = (unsigned long)*map->map;
+ 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;
+}
+
+static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
+{
+ unsigned long map_sz, key, desc_size, buff_size;
+ efi_memory_desc_t *mem_map;
+ struct setup_data *e820ext = NULL;
+ __u32 e820ext_size = 0;
+ efi_status_t status;
+ __u32 desc_version;
+ struct efi_boot_memmap map;
+ struct exit_boot_struct priv;
+
+ map.map = &mem_map;
+ map.map_size = &map_sz;
+ map.desc_size = &desc_size;
+ map.desc_ver = &desc_version;
+ map.key_ptr = &key;
+ map.buff_size = &buff_size;
+ priv.boot_params = boot_params;
+ priv.efi = &boot_params->efi_info;
+
+ status = allocate_e820(boot_params, &e820ext, &e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ /* Might as well exit boot services now */
+ status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ /* Historic? */
+ boot_params->alt_mem_k = 32 * 1024;
+
+ status = setup_e820(boot_params, e820ext, e820ext_size);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ return EFI_SUCCESS;
+}
+
+/*
+ * On success we return a pointer to a boot_params structure, and NULL
+ * on failure.
+ */
+struct boot_params *efi_main(efi_handle_t handle,
+ efi_system_table_t *sys_table_arg,
+ struct boot_params *boot_params)
+{
+ unsigned long bzimage_addr = (unsigned long)startup_32;
+ struct setup_header *hdr = &boot_params->hdr;
+ efi_status_t status;
+ unsigned long cmdline_paddr;
+
+ sys_table = sys_table_arg;
+
+ /* Check if we were booted by the EFI firmware */
+ if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ goto fail;
+
+ /*
+ * If the kernel isn't already loaded at the preferred load
+ * address, relocate it.
+ */
+ if (bzimage_addr != hdr->pref_address) {
+ status = efi_relocate_kernel(&bzimage_addr,
+ hdr->init_size, hdr->init_size,
+ hdr->pref_address,
+ hdr->kernel_alignment,
+ LOAD_PHYSICAL_ADDR);
+ if (status != EFI_SUCCESS) {
+ efi_printk("efi_relocate_kernel() failed!\n");
+ goto fail;
+ }
+ }
+ hdr->code32_start = (u32)bzimage_addr;
+
+ /*
+ * make_boot_params() 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);
+
+ /*
+ * If the boot loader gave us a value for secure_boot then we use that,
+ * otherwise we ask the BIOS.
+ */
+ if (boot_params->secure_boot == efi_secureboot_mode_unset)
+ boot_params->secure_boot = efi_get_secureboot();
+
+ /* Ask the firmware to clear memory on unclean shutdown */
+ efi_enable_reset_attack_mitigation();
+
+ efi_random_get_seed();
+
+ efi_retrieve_tpm2_eventlog();
+
+ setup_graphics(boot_params);
+
+ setup_efi_pci(boot_params);
+
+ setup_quirks(boot_params);
+
+ status = exit_boot(boot_params, handle);
+ if (status != EFI_SUCCESS) {
+ efi_printk("exit_boot() failed!\n");
+ goto fail;
+ }
+
+ return boot_params;
+fail:
+ efi_printk("efi_main() failed!\n");
+
+ for (;;)
+ asm("hlt");
+}