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

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/base.c
Extension
.c
Size
5432 bytes
Lines
214
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

if (!(bios->data = kmalloc(length, GFP_KERNEL))) {
			bios->data = prev;
			return -ENOMEM;
		}
		memcpy(bios->data, prev, bios->size);
		bios->size = length;
		kfree(prev);
		return 1;
	}
	return 0;
}

static void *
nvkm_bios_dtor(struct nvkm_subdev *subdev)
{
	struct nvkm_bios *bios = nvkm_bios(subdev);
	kfree(bios->data);
	return bios;
}

static const struct nvkm_subdev_func
nvkm_bios = {
	.dtor = nvkm_bios_dtor,
};

int
nvkm_bios_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	      struct nvkm_bios **pbios)
{
	struct nvkm_bios *bios;
	struct nvbios_image image;
	struct bit_entry bit_i;
	int ret, idx = 0;

	if (!(bios = *pbios = kzalloc_obj(*bios)))
		return -ENOMEM;
	nvkm_subdev_ctor(&nvkm_bios, device, type, inst, &bios->subdev);

	ret = nvbios_shadow(bios);
	if (ret)
		return ret;

	/* Some tables have weird pointers that need adjustment before
	 * they're dereferenced.  I'm not entirely sure why...
	 */
	if (nvbios_image(bios, idx++, &image)) {
		bios->image0_size = image.size;
		while (nvbios_image(bios, idx++, &image)) {
			if (image.type == 0xe0) {
				bios->imaged_addr = image.base;
				break;
			}
		}
	}

	/* detect type of vbios we're dealing with */
	bios->bmp_offset = nvbios_findstr(bios->data, bios->size,
					  "\xff\x7f""NV\0", 5);
	if (bios->bmp_offset) {
		nvkm_debug(&bios->subdev, "BMP version %x.%x\n",
			   bmp_version(bios) >> 8,
			   bmp_version(bios) & 0xff);
	}

	bios->bit_offset = nvbios_findstr(bios->data, bios->size,
					  "\xff\xb8""BIT", 5);
	if (bios->bit_offset)
		nvkm_debug(&bios->subdev, "BIT signature found\n");

	/* determine the vbios version number */
	if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) {
		bios->version.major = nvbios_rd08(bios, bit_i.offset + 3);
		bios->version.chip  = nvbios_rd08(bios, bit_i.offset + 2);
		bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1);
		bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0);
		bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4);
	} else
	if (bmp_version(bios)) {
		bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13);
		bios->version.chip  = nvbios_rd08(bios, bios->bmp_offset + 12);
		bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11);
		bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10);
	}

	nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n",
		  bios->version.major, bios->version.chip,
		  bios->version.minor, bios->version.micro, bios->version.patch);
	return 0;
}

Annotation

Implementation Notes