path: root/arch/x86/boot/compressed/eboot.c

/* -----------------------------------------------------------------------
 *
 *   Copyright 2011 Intel Corporation; author Matt Fleming
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

#include <linux/efi.h>
#include <linux/pci.h>
#include <asm/efi.h>
#include <asm/setup.h>
#include <asm/desc.h>

#include "../string.h"
#include "eboot.h"

static efi_system_table_t *sys_table;

static struct efi_config *efi_early;

__pure const struct efi_config *__efi_early(void)
{
	return efi_early;
}

#define BOOT_SERVICES(bits)						\
static void setup_boot_services##bits(struct efi_config *c)		\
{									\
	efi_system_table_##bits##_t *table;				\
	efi_boot_services_##bits##_t *bt;				\
									\
	table = (typeof(table))sys_table;				\
									\
	c->text_output = table->con_out;				\
									\
	bt = (typeof(bt))(unsigned long)(table->boottime);		\
									\
	c->allocate_pool = bt->allocate_pool;				\
	c->allocate_pages = bt->allocate_pages;				\
	c->get_memory_map = bt->get_memory_map;				\
	c->free_pool = bt->free_pool;					\
	c->free_pages = bt->free_pages;					\
	c->locate_handle = bt->locate_handle;				\
	c->handle_protocol = bt->handle_protocol;			\
	c->exit_boot_services = bt->exit_boot_services;			\
}
BOOT_SERVICES(32);
BOOT_SERVICES(64);

void efi_char16_printk(efi_system_table_t *, efi_char16_t *);

static efi_status_t
__file_size32(void *__fh, efi_char16_t *filename_16,
	      void **handle, u64 *file_sz)
{
	efi_file_handle_32_t *h, *fh = __fh;
	efi_file_info_t *info;
	efi_status_t status;
	efi_guid_t info_guid = EFI_FILE_INFO_ID;
	u32 info_sz;

	status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
				 EFI_FILE_MODE_READ, (u64)0);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to open file: ");
		efi_char16_printk(sys_table, filename_16);
		efi_printk(sys_table, "\n");
		return status;
	}

	*handle = h;

	info_sz = 0;
	status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
				 &info_sz, NULL);
	if (status != EFI_BUFFER_TOO_SMALL) {
		efi_printk(sys_table, "Failed to get file info size\n");
		return status;
	}

grow:
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				info_sz, (void **)&info);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for file info\n");
		return status;
	}

	status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
				 &info_sz, info);
	if (status == EFI_BUFFER_TOO_SMALL) {
		efi_call_early(free_pool, info);
		goto grow;
	}

	*file_sz = info->file_size;
	efi_call_early(free_pool, info);

	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to get initrd info\n");

	return status;
}

static efi_status_t
__file_size64(void *__fh, efi_char16_t *filename_16,
	      void **handle, u64 *file_sz)
{
	efi_file_handle_64_t *h, *fh = __fh;
	efi_file_info_t *info;
	efi_status_t status;
	efi_guid_t info_guid = EFI_FILE_INFO_ID;
	u64 info_sz;

	status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
				 EFI_FILE_MODE_READ, (u64)0);