drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0203.c
Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0203.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0203.c- Extension
.c- Size
- 3563 bytes
- Lines
- 130
- 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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
subdev/bios.hsubdev/bios/bit.hsubdev/bios/M0203.h
Detected Declarations
function filesfunction nvbios_M0203Tpfunction nvbios_M0203Eefunction nvbios_M0203Epfunction nvbios_M0203Em
Annotated Snippet
if (data) {
*ver = nvbios_rd08(bios, data + 0x00);
switch (*ver) {
case 0x10:
*hdr = nvbios_rd08(bios, data + 0x01);
*len = nvbios_rd08(bios, data + 0x02);
*cnt = nvbios_rd08(bios, data + 0x03);
return data;
default:
break;
}
}
}
return 0x00000000;
}
u32
nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
struct nvbios_M0203T *info)
{
u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
memset(info, 0x00, sizeof(*info));
switch (!!data * *ver) {
case 0x10:
info->type = nvbios_rd08(bios, data + 0x04);
info->pointer = nvbios_rd16(bios, data + 0x05);
break;
default:
break;
}
return data;
}
u32
nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
{
u8 cnt, len;
u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
if (data && idx < cnt) {
data = data + *hdr + idx * len;
*hdr = len;
return data;
}
return 0x00000000;
}
u32
nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
struct nvbios_M0203E *info)
{
u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
memset(info, 0x00, sizeof(*info));
switch (!!data * *ver) {
case 0x10:
info->type = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0;
info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4;
info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0;
return data;
default:
break;
}
return 0x00000000;
}
u32
nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
struct nvbios_M0203E *info)
{
struct nvkm_subdev *subdev = &bios->subdev;
struct nvbios_M0203T M0203T;
u8 cnt, len, idx = 0xff;
u32 data;
if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
nvkm_warn(subdev, "M0203T not found\n");
return 0x00000000;
}
while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
switch (M0203T.type) {
case M0203T_TYPE_RAMCFG:
if (info->strap != ramcfg)
continue;
return data;
default:
nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type);
return 0x00000000;
}
}
Annotation
- Immediate include surface: `subdev/bios.h`, `subdev/bios/bit.h`, `subdev/bios/M0203.h`.
- Detected declarations: `function files`, `function nvbios_M0203Tp`, `function nvbios_M0203Ee`, `function nvbios_M0203Ep`, `function nvbios_M0203Em`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.