path: root/arch/ia64/kernel/efi.c

/*
 * Extensible Firmware Interface
 *
 * Based on Extensible Firmware Interface Specification version 0.9
 * April 30, 1999
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999-2003 Hewlett-Packard Co.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Stephane Eranian <eranian@hpl.hp.com>
 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 *
 * All EFI Runtime Services are not implemented yet as EFI only
 * supports physical mode addressing on SoftSDV. This is to be fixed
 * in a future version.  --drummond 1999-07-20
 *
 * Implemented EFI runtime services and virtual mode calls.  --davidm
 *
 * Goutham Rao: <goutham.rao@intel.com>
 *	Skip non-WB memory and ignore empty memory ranges.
 */
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/efi.h>
#include <linux/kexec.h>
#include <linux/mm.h>

#include <asm/io.h>
#include <asm/kregs.h>
#include <asm/meminit.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/mca.h>
#include <asm/tlbflush.h>

#define EFI_DEBUG	0

extern efi_status_t efi_call_phys (void *, ...);

struct efi efi;
EXPORT_SYMBOL(efi);
static efi_runtime_services_t *runtime;
static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;

#define efi_call_virt(f, args...)	(*(f))(args)

#define STUB_GET_TIME(prefix, adjust_arg)				       \
static efi_status_t							       \
prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)			       \
{									       \
	struct ia64_fpreg fr[6];					       \
	efi_time_cap_t *atc = NULL;					       \
	efi_status_t ret;						       \
									       \
	if (tc)								       \
		atc = adjust_arg(tc);					       \
	ia64_save_scratch_fpregs(fr);					       \
	ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
				adjust_arg(tm), atc);			       \
	ia64_load_scratch_fpregs(fr);					       \
	return ret;							       \
}

#define STUB_SET_TIME(prefix, adjust_arg)				       \
static efi_status_t							       \
prefix##_set_time (efi_time_t *tm)					       \
{									       \
	struct ia64_fpreg fr[6];					       \
	efi_status_t ret;						       \
									       \
	ia64_save_scratch_fpregs(fr);					       \
	ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
				adjust_arg(tm));			       \
	ia64_load_scratch_fpregs(fr);					       \
	return ret;							       \
}

#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)			       \
static efi_status_t							       \
prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,	       \
			  efi_time_t *tm)				       \
{									       \
	struct ia64_fpreg fr[6];					       \
	efi_status_t ret;						       \
									       \
	ia64_save_scratch_fpregs(fr);					       \
	ret = efi_call_##prefix(					       \
		(efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
		adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
	ia64_load_scratch_fpregs(fr);					       \
	return ret;							       \
}

#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)			       \
static efi_status_t							       \
prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)		       \
{									       \
	struct ia64_fpreg fr[6];					       \
	efi_time_t *atm = NULL;						       \
	efi_status_t ret;						       \
									       \
	if (tm)								       \
		atm = adjust_arg(tm);					       \
	ia64_save_scratch_fpregs(fr);					       \
	ret = efi_call_##prefix(					       \
		(efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
		enabled, atm);						       \
	ia64_load_scratch_fpregs(fr);					       \
	return ret;							       \
}

#define STUB_GET_VARIABLE(prefix, adjust_arg)				       \
static efi_status_t							       \
prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
		       unsigned long *data_size, void *data)		       \
{									       \
	struct ia64_fpreg fr[6];					       \
	u32 *aattr = NULL;						       \
	efi_status_t ret;						       \
									       \
	if (attr)							       \
		aattr = adjust_arg(attr);				       \
	ia64_save_scratch_fpregs(fr);					       \
	ret = efi_call_##prefix(					       \
		(efi_get_variable_t *) __va(runtime->get_variable),	       \
		adjust_arg(name), adjust_arg(vendor), aattr,		       \
		adjust_arg(data_size), adjust_arg(data));		       \
	ia64_load_scratch_fpregs(fr);					       \