[librm] Ensure that inline code symbols are unique
[ipxe.git] / src / arch / x86 / transitions / librm_test.c
1 /*
2 * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA.
18 *
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
22 */
23
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25
26 /** @file
27 *
28 * Real mode transition self-tests
29 *
30 * This file allows for easy measurement of the time taken to perform
31 * real mode transitions, which may have a substantial overhead when
32 * running under a hypervisor.
33 *
34 */
35
36 /* Forcibly enable assertions */
37 #undef NDEBUG
38
39 #include <ipxe/test.h>
40 #include <ipxe/profile.h>
41 #include <realmode.h>
42
43 /** Number of sample iterations for profiling */
44 #define PROFILE_COUNT 4096
45
46 /** Protected-to-real mode transition profiler */
47 static struct profiler p2r_profiler __profiler = { .name = "p2r" };
48
49 /** Real-to-protected mode transition profiler */
50 static struct profiler r2p_profiler __profiler = { .name = "r2p" };
51
52 /** Real-mode call profiler */
53 static struct profiler real_call_profiler __profiler = { .name = "real_call" };
54
55 /** Virtual call profiler */
56 static struct profiler virt_call_profiler __profiler = { .name = "virt_call" };
57
58 /**
59 * Dummy function for profiling tests
60 */
61 static __asmcall void librm_test_call ( struct i386_all_regs *ix86 __unused ) {
62 /* Do nothing */
63 }
64
65 /**
66 * Perform real mode transition self-tests
67 *
68 */
69 static void librm_test_exec ( void ) {
70 unsigned int i;
71 unsigned long timestamp;
72 uint32_t timestamp_lo;
73 uint32_t timestamp_hi;
74 uint32_t started;
75 uint32_t stopped;
76 uint32_t discard_d;
77
78 /* Profile mode transitions. We want to profile each
79 * direction of the transition separately, so perform an RDTSC
80 * while in real mode and tweak the profilers' start/stop
81 * times appropriately.
82 */
83 for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
84 profile_start ( &p2r_profiler );
85 __asm__ __volatile__ ( REAL_CODE ( "rdtsc\n\t" )
86 : "=a" ( timestamp_lo ),
87 "=d" ( timestamp_hi )
88 : );
89 timestamp = timestamp_lo;
90 if ( sizeof ( timestamp ) > sizeof ( timestamp_lo ) )
91 timestamp |= ( ( ( uint64_t ) timestamp_hi ) << 32 );
92 profile_start_at ( &r2p_profiler, timestamp );
93 profile_stop ( &r2p_profiler );
94 profile_stop_at ( &p2r_profiler, timestamp );
95 }
96
97 /* Profile complete real-mode call cycle */
98 for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
99 profile_start ( &real_call_profiler );
100 __asm__ __volatile__ ( REAL_CODE ( "" ) : );
101 profile_stop ( &real_call_profiler );
102 }
103
104 /* Profile complete virtual call cycle */
105 for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
106 __asm__ __volatile__ ( REAL_CODE ( "rdtsc\n\t"
107 "movl %k0, %k2\n\t"
108 VIRT_CALL ( librm_test_call )
109 "rdtsc\n\t" )
110 : "=a" ( stopped ), "=d" ( discard_d ),
111 "=R" ( started ) : );
112 profile_start_at ( &virt_call_profiler, started );
113 profile_stop_at ( &virt_call_profiler, stopped );
114 }
115 }
116
117 /** Real mode transition self-test */
118 struct self_test librm_test __self_test = {
119 .name = "librm",
120 .exec = librm_test_exec,
121 };
122
123 REQUIRING_SYMBOL ( librm_test );
124 REQUIRE_OBJECT ( test );