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sys/dev/vt/hw/efifb/efifb.c
| Show First 20 Lines • Show All 90 Lines • ▼ Show 20 Lines | vt_efifb_probe(struct vt_device *vd) | ||||
| return (CN_INTERNAL); | return (CN_INTERNAL); | ||||
| } | } | ||||
| static int | static int | ||||
| vt_efifb_init(struct vt_device *vd) | vt_efifb_init(struct vt_device *vd) | ||||
| { | { | ||||
| struct fb_info *info; | struct fb_info *info; | ||||
| struct efi_fb *efifb; | struct efi_fb *efifb; | ||||
| int memattr; | vm_memattr_t memattr; | ||||
| int roff, goff, boff; | int roff, goff, boff; | ||||
| #ifdef VM_MEMATTR_WRITE_COMBINING | |||||
| char attr[16]; | char attr[16]; | ||||
| /* | /* | ||||
| * XXX TODO: I think there's more nuance here than we're acknowledging, | * XXX TODO: I think there's more nuance here than we're acknowledging, | ||||
| * and we should look into it. It may be that the framebuffer lives in | * and we should look into it. It may be that the framebuffer lives in | ||||
| * a segment of memory that doesn't support one or both of these. We | * a segment of memory that doesn't support one or both of these. We | ||||
| * should likely be consulting the memory map for any applicable | * should likely be consulting the memory map for any applicable | ||||
| * cacheability attributes before making a final decision. | * cacheability attributes before making a final decision. | ||||
| */ | */ | ||||
| memattr = VM_MEMATTR_WRITE_COMBINING; | memattr = VM_MEMATTR_WRITE_COMBINING; | ||||
| if (TUNABLE_STR_FETCH("hw.efifb.cache_attr", attr, sizeof(attr))) { | if (TUNABLE_STR_FETCH("hw.efifb.cache_attr", attr, sizeof(attr))) { | ||||
| /* | /* | ||||
| * We'll allow WC but it's currently the default, UC is the only | * We'll allow WC but it's currently the default, UC is the only | ||||
| * other tested one at this time. | * other tested one at this time. | ||||
| */ | */ | ||||
| if (strcasecmp(attr, "wc") != 0 && | if (strcasecmp(attr, "wc") != 0 && | ||||
| strcasecmp(attr, "uc") != 0) { | strcasecmp(attr, "uc") != 0) { | ||||
| printf("efifb: unsupported cache attr specified: %s\n", | printf("efifb: unsupported cache attr specified: %s\n", | ||||
| attr); | attr); | ||||
| printf("efifb: expected \"wc\" or \"uc\"\n"); | printf("efifb: expected \"wc\" or \"uc\"\n"); | ||||
| } else if (strcasecmp(attr, "uc") == 0) { | } else if (strcasecmp(attr, "uc") == 0) { | ||||
| memattr = VM_MEMATTR_UNCACHEABLE; | memattr = VM_MEMATTR_UNCACHEABLE; | ||||
| } | } | ||||
| } | } | ||||
| #else | |||||
| memattr = VM_MEMATTR_UNCACHEABLE; | |||||
| #endif | |||||
| info = vd->vd_softc; | info = vd->vd_softc; | ||||
| if (info == NULL) | if (info == NULL) | ||||
| info = vd->vd_softc = (void *)&local_info; | info = vd->vd_softc = (void *)&local_info; | ||||
| efifb = (struct efi_fb *)preload_search_info(preload_kmdp, | efifb = (struct efi_fb *)preload_search_info(preload_kmdp, | ||||
| MODINFO_METADATA | MODINFOMD_EFI_FB); | MODINFO_METADATA | MODINFOMD_EFI_FB); | ||||
| if (efifb == NULL) | if (efifb == NULL) | ||||
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