2016-09-21 10:35:44 +00:00
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/*-
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* Copyright (c) 2016 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __AMD64_INCLUDE_EFI_H_
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#define __AMD64_INCLUDE_EFI_H_
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/*
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* XXX: from gcc 6.2 manual:
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* Note, the ms_abi attribute for Microsoft Windows 64-bit targets
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* currently requires the -maccumulate-outgoing-args option.
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2017-07-20 06:47:06 +00:00
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*
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* Avoid EFIABI_ATTR declarations for compilers that don't support it.
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* GCC support began in version 4.4.
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2016-09-21 10:35:44 +00:00
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*/
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2017-07-20 06:47:06 +00:00
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#if defined(__clang__) || defined(__GNUC__) && \
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(__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 4)
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2016-09-21 10:35:44 +00:00
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#define EFIABI_ATTR __attribute__((ms_abi))
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2017-07-20 06:47:06 +00:00
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#endif
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2016-09-21 10:35:44 +00:00
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2017-10-02 08:37:43 +00:00
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#ifdef _KERNEL
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#include <isa/rtc.h>
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2018-09-02 19:48:41 +00:00
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#define EFI_TIME_LOCK() mtx_lock(&atrtc_time_lock)
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#define EFI_TIME_UNLOCK() mtx_unlock(&atrtc_time_lock)
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#define EFI_TIME_OWNED() mtx_assert(&atrtc_time_lock, MA_OWNED)
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2018-09-02 21:37:05 +00:00
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#define EFI_RT_HANDLE_FAULTS_DEFAULT 1
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2017-10-02 08:37:43 +00:00
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#endif
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Add kernel interfaces to call EFI Runtime Services.
Runtime services require special execution environment for the call.
Besides that, OS must inform firmware about runtime virtual memory map
which will be active during the calls, with the SetVirtualAddressMap()
runtime call, done while the 1:1 mapping is still used. There are two
complication: the SetVirtualAddressMap() effectively must be done from
loader, which needs to know kernel address map in advance. More,
despite not explicitely mentioned in the specification, both 1:1 and
the map passed to SetVirtualAddressMap() must be active during the
SetVirtualAddressMap() call. Second, there are buggy BIOSes which
require both mappings active during runtime calls as well, most likely
because they fail to identify all relocations to perform.
On amd64, we can get rid of both problems by providing 1:1 mapping for
the duration of runtime calls, by temprorary remapping user addresses.
As result, we avoid the need for loader to know about future kernel
address map, and avoid bugs in BIOSes. Typically BIOS only maps
something in low 4G. If not runtime bugs, we would take advantage of
the DMAP, as previous versions of this patch did.
Similar but more complicated trick can be used even for i386 and 32bit
runtime, if and when the EFI boot on i386 is supported. We would need
a trampoline page, since potentially whole 4G of VA would be switched
on calls, instead of only userspace portion on amd64.
Context switches are disabled for the duration of the call, FPU access
is granted, and interrupts are not disabled. The later is possible
because kernel is mapped during calls.
To test, the sysctl mib debug.efi_time is provided, setting it to 1
makes one call to EFI get_time() runtime service, on success the efitm
structure is printed to the control terminal. Load efirt.ko, or add
EFIRT option to the kernel config, to enable code.
Discussed with: emaste, imp
Tested by: emaste (mac, qemu)
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
2016-09-21 11:31:58 +00:00
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2018-09-02 21:37:05 +00:00
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struct efirt_callinfo {
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const char *ec_name;
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register_t ec_efi_status;
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register_t ec_fptr;
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register_t ec_argcnt;
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register_t ec_arg1;
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register_t ec_arg2;
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register_t ec_arg3;
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register_t ec_arg4;
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register_t ec_arg5;
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register_t ec_rbx;
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register_t ec_rsp;
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register_t ec_rbp;
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register_t ec_r12;
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register_t ec_r13;
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register_t ec_r14;
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register_t ec_r15;
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2019-06-03 15:32:42 +00:00
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register_t ec_rflags;
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2018-09-02 21:37:05 +00:00
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};
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2016-09-21 10:35:44 +00:00
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#endif /* __AMD64_INCLUDE_EFI_H_ */
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