cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/bios/base.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */
#include "priv.h"

#include <subdev/bios.h>
#include <subdev/bios/bmp.h>
#include <subdev/bios/bit.h>
#include <subdev/bios/image.h>


static bool nvbios_addr(struct nvkm_bios *bios, u32 *addr, u8 size) { u32 p = *addr; if (*addr > bios->image0_size && bios->imaged_addr) { *addr -= bios->image0_size; *addr += bios->imaged_addr; } if (unlikely(*addr + size >= bios->size)) { nvkm_error(&bios->subdev, "OOB %d %08x %08x\n", size, p, *addr); return false; } return true; }

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Ben Skeggs92100.00%2100.00%
Total92100.00%2100.00%


u8 nvbios_rd08(struct nvkm_bios *bios, u32 addr) { if (likely(nvbios_addr(bios, &addr, 1))) return bios->data[addr]; return 0x00; }

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Ben Skeggs39100.00%1100.00%
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u16 nvbios_rd16(struct nvkm_bios *bios, u32 addr) { if (likely(nvbios_addr(bios, &addr, 2))) return get_unaligned_le16(&bios->data[addr]); return 0x0000; }

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Ben Skeggs43100.00%1100.00%
Total43100.00%1100.00%


u32 nvbios_rd32(struct nvkm_bios *bios, u32 addr) { if (likely(nvbios_addr(bios, &addr, 4))) return get_unaligned_le32(&bios->data[addr]); return 0x00000000; }

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Ben Skeggs43100.00%1100.00%
Total43100.00%1100.00%


u8 nvbios_checksum(const u8 *data, int size) { u8 sum = 0; while (size--) sum += *data++; return sum; }

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Ben Skeggs32100.00%1100.00%
Total32100.00%1100.00%


u16 nvbios_findstr(const u8 *data, int size, const char *str, int len) { int i, j; for (i = 0; i <= (size - len); i++) { for (j = 0; j < len; j++) if ((char)data[i + j] != str[j]) break; if (j == len) return i; } return 0; }

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Ben Skeggs88100.00%1100.00%
Total88100.00%1100.00%


int nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len) { unsigned char c1, c2; while (len--) { c1 = nvbios_rd08(bios, addr++); c2 = *(str++); if (c1 != c2) return c1 - c2; } return 0; }

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Ben Skeggs66100.00%2100.00%
Total66100.00%2100.00%


int nvbios_extend(struct nvkm_bios *bios, u32 length) { if (bios->size < length) { u8 *prev = bios->data; 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; }

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Ben Skeggs8797.75%787.50%
Maarten Lankhorst22.25%112.50%
Total89100.00%8100.00%


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

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Ben Skeggs32100.00%2100.00%
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static const struct nvkm_subdev_func nvkm_bios = { .dtor = nvkm_bios_dtor, };
int nvkm_bios_new(struct nvkm_device *device, int index, 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(sizeof(*bios), GFP_KERNEL))) return -ENOMEM; nvkm_subdev_ctor(&nvkm_bios, device, index, &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; }

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Ben Skeggs468100.00%8100.00%
Total468100.00%8100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs101999.80%1292.31%
Maarten Lankhorst20.20%17.69%
Total1021100.00%13100.00%
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