2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 * Check extended CPU capabilities. Now justs returns the raw CPUID
27 * feature information, allowing the higher level code to interpret the
30 * Written by Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>
32 * Cleaned up and simplified by Gareth Hughes <gareth@valinux.com>
37 * NOTE: Avoid using spaces in between '(' ')' and arguments, especially
38 * with macros like CONST, LLBL that expand to CONCAT(...). Putting spaces
39 * in there will break the build on some platforms.
43 #include "common_x86_features.h"
48 GLOBL GLNAME(_mesa_x86_has_cpuid)
49 GLNAME(_mesa_x86_has_cpuid):
51 /* Test for the CPUID command. If the ID Flag bit in EFLAGS
52 * (bit 21) is writable, the CPUID command is present */
56 XOR_L (CONST(0x00200000), EAX)
62 /* Verify the ID Flag bit has been written. */
65 XOR_L (CONST(0xff), EAX)
71 GLOBL GLNAME(_mesa_x86_cpuid)
72 GLNAME(_mesa_x86_cpuid):
74 MOV_L (REGOFF(4, ESP), EAX) /* cpuid op */
80 MOV_L (REGOFF(16, ESP), EDI) /* *eax */
81 MOV_L (EAX, REGIND(EDI))
82 MOV_L (REGOFF(20, ESP), EDI) /* *ebx */
83 MOV_L (EBX, REGIND(EDI))
84 MOV_L (REGOFF(24, ESP), EDI) /* *ecx */
85 MOV_L (ECX, REGIND(EDI))
86 MOV_L (REGOFF(28, ESP), EDI) /* *edx */
87 MOV_L (EDX, REGIND(EDI))
94 GLOBL GLNAME(_mesa_x86_cpuid_eax)
95 GLNAME(_mesa_x86_cpuid_eax):
97 MOV_L (REGOFF(4, ESP), EAX) /* cpuid op */
106 GLOBL GLNAME(_mesa_x86_cpuid_ebx)
107 GLNAME(_mesa_x86_cpuid_ebx):
109 MOV_L (REGOFF(4, ESP), EAX) /* cpuid op */
113 MOV_L (EBX, EAX) /* return EBX */
119 GLOBL GLNAME(_mesa_x86_cpuid_ecx)
120 GLNAME(_mesa_x86_cpuid_ecx):
122 MOV_L (REGOFF(4, ESP), EAX) /* cpuid op */
126 MOV_L (ECX, EAX) /* return ECX */
132 GLOBL GLNAME(_mesa_x86_cpuid_edx)
133 GLNAME(_mesa_x86_cpuid_edx):
135 MOV_L (REGOFF(4, ESP), EAX) /* cpuid op */
139 MOV_L (EDX, EAX) /* return EDX */
145 /* Execute an SSE instruction to see if the operating system correctly
146 * supports SSE. A signal handler for SIGILL should have been set
147 * before calling this function, otherwise this could kill the client
150 * -----> !!!! ATTENTION DEVELOPERS !!!! <-----
152 * If you're debugging with gdb and you get stopped in this function,
153 * just type 'continue'! Execution will proceed normally.
154 * See freedesktop.org bug #1709 for more info.
157 GLOBL GLNAME( _mesa_test_os_sse_support )
158 GLNAME( _mesa_test_os_sse_support ):
165 /* Perform an SSE divide-by-zero to see if the operating system
166 * correctly supports unmasked SIMD FPU exceptions. Signal handlers for
167 * SIGILL and SIGFPE should have been set before calling this function,
168 * otherwise this could kill the client application.
171 GLOBL GLNAME( _mesa_test_os_sse_exception_support )
172 GLNAME( _mesa_test_os_sse_exception_support ):
176 SUB_L ( CONST( 8 ), ESP )
178 /* Save the original MXCSR register value.
180 STMXCSR ( REGOFF( -4, EBP ) )
182 /* Unmask the divide-by-zero exception and perform one.
184 STMXCSR ( REGOFF( -8, EBP ) )
185 AND_L ( CONST( 0xfffffdff ), REGOFF( -8, EBP ) )
186 LDMXCSR ( REGOFF( -8, EBP ) )
190 PUSH_L ( CONST( 0x3f800000 ) )
191 PUSH_L ( CONST( 0x3f800000 ) )
192 PUSH_L ( CONST( 0x3f800000 ) )
193 PUSH_L ( CONST( 0x3f800000 ) )
195 MOVUPS ( REGIND( ESP ), XMM1 )
199 /* Restore the original MXCSR register value.
201 LDMXCSR ( REGOFF( -4, EBP ) )