drivers/gpu/drm/nouveau/nvkm/subdev/bios/pcir.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bios/pcir.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/pcir.c
Extension
.c
Size
2490 bytes
Lines
70
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (nvbios_rd32(bios, data + 0x00)) {
		case 0x52494350: /* PCIR */
		case 0x53494752: /* RGIS */
		case 0x5344504e: /* NPDS */
			*hdr = nvbios_rd16(bios, data + 0x0a);
			*ver = nvbios_rd08(bios, data + 0x0c);
			break;
		default:
			nvkm_debug(&bios->subdev,
				   "%08x: PCIR signature (%08x) unknown\n",
				   data, nvbios_rd32(bios, data + 0x00));
			data = 0;
			break;
		}
	}
	return data;
}

u32
nvbios_pcirTp(struct nvkm_bios *bios, u32 base, u8 *ver, u16 *hdr,
	      struct nvbios_pcirT *info)
{
	u32 data = nvbios_pcirTe(bios, base, ver, hdr);
	memset(info, 0x00, sizeof(*info));
	if (data) {
		info->vendor_id = nvbios_rd16(bios, data + 0x04);
		info->device_id = nvbios_rd16(bios, data + 0x06);
		info->class_code[0] = nvbios_rd08(bios, data + 0x0d);
		info->class_code[1] = nvbios_rd08(bios, data + 0x0e);
		info->class_code[2] = nvbios_rd08(bios, data + 0x0f);
		info->image_size = nvbios_rd16(bios, data + 0x10) * 512;
		info->image_rev = nvbios_rd16(bios, data + 0x12);
		info->image_type = nvbios_rd08(bios, data + 0x14);
		info->last = nvbios_rd08(bios, data + 0x15) & 0x80;
	}
	return data;
}

Annotation

Implementation Notes