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https://gitlab.com/qemu-project/ipxe.git
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916ebef198
The "used" attribute can be applied only to functions or variables, which prevents the use of __asmcall as a type attribute. Fix by removing "used" from the definition of __asmcall for i386 and x86_64 architectures, and adding explicit __used annotations where necessary. Signed-off-by: Michael Brown <mcb30@ipxe.org>
126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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* Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* Real mode transition self-tests
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*
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* This file allows for easy measurement of the time taken to perform
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* real mode transitions, which may have a substantial overhead when
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* running under a hypervisor.
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*
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*/
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/* Forcibly enable assertions */
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#undef NDEBUG
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#include <ipxe/test.h>
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#include <ipxe/profile.h>
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#include <realmode.h>
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/** Number of sample iterations for profiling */
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#define PROFILE_COUNT 4096
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/** Protected-to-real mode transition profiler */
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static struct profiler p2r_profiler __profiler = { .name = "p2r" };
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/** Real-to-protected mode transition profiler */
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static struct profiler r2p_profiler __profiler = { .name = "r2p" };
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/** Real-mode call profiler */
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static struct profiler real_call_profiler __profiler = { .name = "real_call" };
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/** Virtual call profiler */
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static struct profiler virt_call_profiler __profiler = { .name = "virt_call" };
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/**
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* Dummy function for profiling tests
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*/
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static __asmcall __used void
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librm_test_call ( struct i386_all_regs *ix86 __unused ) {
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/* Do nothing */
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}
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/**
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* Perform real mode transition self-tests
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*
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*/
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static void librm_test_exec ( void ) {
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unsigned int i;
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unsigned long timestamp;
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uint32_t timestamp_lo;
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uint32_t timestamp_hi;
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uint32_t started;
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uint32_t stopped;
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uint32_t discard_d;
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/* Profile mode transitions. We want to profile each
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* direction of the transition separately, so perform an RDTSC
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* while in real mode and tweak the profilers' start/stop
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* times appropriately.
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*/
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for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
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profile_start ( &p2r_profiler );
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__asm__ __volatile__ ( REAL_CODE ( "rdtsc\n\t" )
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: "=a" ( timestamp_lo ),
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"=d" ( timestamp_hi )
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: );
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timestamp = timestamp_lo;
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if ( sizeof ( timestamp ) > sizeof ( timestamp_lo ) )
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timestamp |= ( ( ( uint64_t ) timestamp_hi ) << 32 );
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profile_start_at ( &r2p_profiler, timestamp );
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profile_stop ( &r2p_profiler );
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profile_stop_at ( &p2r_profiler, timestamp );
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}
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/* Profile complete real-mode call cycle */
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for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
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profile_start ( &real_call_profiler );
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__asm__ __volatile__ ( REAL_CODE ( "" ) : );
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profile_stop ( &real_call_profiler );
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}
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/* Profile complete virtual call cycle */
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for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
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__asm__ __volatile__ ( REAL_CODE ( "rdtsc\n\t"
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"movl %k0, %k2\n\t"
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VIRT_CALL ( librm_test_call )
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"rdtsc\n\t" )
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: "=a" ( stopped ), "=d" ( discard_d ),
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"=R" ( started ) : );
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profile_start_at ( &virt_call_profiler, started );
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profile_stop_at ( &virt_call_profiler, stopped );
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}
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}
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/** Real mode transition self-test */
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struct self_test librm_test __self_test = {
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.name = "librm",
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.exec = librm_test_exec,
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};
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REQUIRING_SYMBOL ( librm_test );
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REQUIRE_OBJECT ( test );
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