pixman-mips.c (3561B)
1 /* 2 * Copyright © 2000 SuSE, Inc. 3 * Copyright © 2007 Red Hat, Inc. 4 * 5 * Permission to use, copy, modify, distribute, and sell this software and its 6 * documentation for any purpose is hereby granted without fee, provided that 7 * the above copyright notice appear in all copies and that both that 8 * copyright notice and this permission notice appear in supporting 9 * documentation, and that the name of SuSE not be used in advertising or 10 * publicity pertaining to distribution of the software without specific, 11 * written prior permission. SuSE makes no representations about the 12 * suitability of this software for any purpose. It is provided "as is" 13 * without express or implied warranty. 14 * 15 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE 17 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 19 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 21 */ 22 #ifdef HAVE_CONFIG_H 23 #include <pixman-config.h> 24 #endif 25 26 #include "pixman-private.h" 27 28 #if defined(USE_MIPS_DSPR2) || defined(USE_LOONGSON_MMI) 29 30 #include <string.h> 31 #include <stdlib.h> 32 33 static pixman_bool_t 34 have_feature (const char *search_string) 35 { 36 #if defined (__linux__) /* linux ELF */ 37 /* Simple detection of MIPS features at runtime for Linux. 38 * It is based on /proc/cpuinfo, which reveals hardware configuration 39 * to user-space applications. According to MIPS (early 2010), no similar 40 * facility is universally available on the MIPS architectures, so it's up 41 * to individual OSes to provide such. 42 */ 43 const char *file_name = "/proc/cpuinfo"; 44 char cpuinfo_line[256]; 45 FILE *f = NULL; 46 47 if ((f = fopen (file_name, "r")) == NULL) 48 return FALSE; 49 50 while (fgets (cpuinfo_line, sizeof (cpuinfo_line), f) != NULL) 51 { 52 if (strstr (cpuinfo_line, search_string) != NULL) 53 { 54 fclose (f); 55 return TRUE; 56 } 57 } 58 59 fclose (f); 60 #endif 61 62 #if defined (CI_HAS_ALL_MIPS_CPU_FEATURES) 63 /* Used to force feature discovery in CI where /proc/cpuinfo is unreliable. 64 * It can happen, e.g., if executed in qemu-user-static mode. 65 * 66 * For such a build, MIPS-specific features need to be manually disabled by 67 * using `PIXMAN_DISABLE` env variable 68 * 69 * SHOULD NOT BE USED IN RELEASE BUILD! 70 */ 71 #warning "Building with disabled MIPS feature discovery. SHOULD NOT BE USED IN RELEASE BUILD!" 72 return TRUE; 73 #endif 74 75 /* Did not find string in the proc file, or not Linux ELF. */ 76 return FALSE; 77 } 78 79 #endif 80 81 pixman_implementation_t * 82 _pixman_mips_get_implementations (pixman_implementation_t *imp) 83 { 84 #ifdef USE_LOONGSON_MMI 85 /* I really don't know if some Loongson CPUs don't have MMI. */ 86 if (!_pixman_disabled ("loongson-mmi") && have_feature ("Loongson")) 87 imp = _pixman_implementation_create_mmx (imp); 88 #endif 89 90 #ifdef USE_MIPS_DSPR2 91 if (!_pixman_disabled ("mips-dspr2")) 92 { 93 int already_compiling_everything_for_dspr2 = 0; 94 #if defined(__mips_dsp) && (__mips_dsp_rev >= 2) 95 already_compiling_everything_for_dspr2 = 1; 96 #endif 97 if (already_compiling_everything_for_dspr2 || 98 /* Only currently available MIPS core that supports DSPr2 is 74K. */ 99 have_feature ("MIPS 74K")) 100 { 101 imp = _pixman_implementation_create_mips_dspr2 (imp); 102 } 103 } 104 #endif 105 106 return imp; 107 }