1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs 23 */ 24 #include "priv.h" 25 26 #include <subdev/bios.h> 27 #include <subdev/bios/bmp.h> 28 #include <subdev/bios/bit.h> 29 #include <subdev/bios/image.h> 30 31 static bool 32 nvbios_addr(struct nvkm_bios *bios, u32 *addr, u8 size) 33 { 34 u32 p = *addr; 35 36 if (*addr >= bios->image0_size && bios->imaged_addr) { 37 *addr -= bios->image0_size; 38 *addr += bios->imaged_addr; 39 } 40 41 if (unlikely(*addr + size > bios->size)) { 42 nvkm_error(&bios->subdev, "OOB %d %08x %08x\n", size, p, *addr); 43 return false; 44 } 45 46 return true; 47 } 48 49 u8 50 nvbios_rd08(struct nvkm_bios *bios, u32 addr) 51 { 52 if (likely(nvbios_addr(bios, &addr, 1))) 53 return bios->data[addr]; 54 return 0x00; 55 } 56 57 u16 58 nvbios_rd16(struct nvkm_bios *bios, u32 addr) 59 { 60 if (likely(nvbios_addr(bios, &addr, 2))) 61 return get_unaligned_le16(&bios->data[addr]); 62 return 0x0000; 63 } 64 65 u32 66 nvbios_rd32(struct nvkm_bios *bios, u32 addr) 67 { 68 if (likely(nvbios_addr(bios, &addr, 4))) 69 return get_unaligned_le32(&bios->data[addr]); 70 return 0x00000000; 71 } 72 73 u8 74 nvbios_checksum(const u8 *data, int size) 75 { 76 u8 sum = 0; 77 while (size--) 78 sum += *data++; 79 return sum; 80 } 81 82 u16 83 nvbios_findstr(const u8 *data, int size, const char *str, int len) 84 { 85 int i, j; 86 87 for (i = 0; i <= (size - len); i++) { 88 for (j = 0; j < len; j++) 89 if ((char)data[i + j] != str[j]) 90 break; 91 if (j == len) 92 return i; 93 } 94 95 return 0; 96 } 97 98 int 99 nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len) 100 { 101 unsigned char c1, c2; 102 103 while (len--) { 104 c1 = nvbios_rd08(bios, addr++); 105 c2 = *(str++); 106 if (c1 != c2) 107 return c1 - c2; 108 } 109 return 0; 110 } 111 112 int 113 nvbios_extend(struct nvkm_bios *bios, u32 length) 114 { 115 if (bios->size < length) { 116 u8 *prev = bios->data; 117 if (!(bios->data = kmalloc(length, GFP_KERNEL))) { 118 bios->data = prev; 119 return -ENOMEM; 120 } 121 memcpy(bios->data, prev, bios->size); 122 bios->size = length; 123 kfree(prev); 124 return 1; 125 } 126 return 0; 127 } 128 129 static void * 130 nvkm_bios_dtor(struct nvkm_subdev *subdev) 131 { 132 struct nvkm_bios *bios = nvkm_bios(subdev); 133 kfree(bios->data); 134 return bios; 135 } 136 137 static const struct nvkm_subdev_func 138 nvkm_bios = { 139 .dtor = nvkm_bios_dtor, 140 }; 141 142 int 143 nvkm_bios_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst, 144 struct nvkm_bios **pbios) 145 { 146 struct nvkm_bios *bios; 147 struct nvbios_image image; 148 struct bit_entry bit_i; 149 int ret, idx = 0; 150 151 if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL))) 152 return -ENOMEM; 153 nvkm_subdev_ctor(&nvkm_bios, device, type, inst, &bios->subdev); 154 155 ret = nvbios_shadow(bios); 156 if (ret) 157 return ret; 158 159 /* Some tables have weird pointers that need adjustment before 160 * they're dereferenced. I'm not entirely sure why... 161 */ 162 if (nvbios_image(bios, idx++, &image)) { 163 bios->image0_size = image.size; 164 while (nvbios_image(bios, idx++, &image)) { 165 if (image.type == 0xe0) { 166 bios->imaged_addr = image.base; 167 break; 168 } 169 } 170 } 171 172 /* detect type of vbios we're dealing with */ 173 bios->bmp_offset = nvbios_findstr(bios->data, bios->size, 174 "\xff\x7f""NV\0", 5); 175 if (bios->bmp_offset) { 176 nvkm_debug(&bios->subdev, "BMP version %x.%x\n", 177 bmp_version(bios) >> 8, 178 bmp_version(bios) & 0xff); 179 } 180 181 bios->bit_offset = nvbios_findstr(bios->data, bios->size, 182 "\xff\xb8""BIT", 5); 183 if (bios->bit_offset) 184 nvkm_debug(&bios->subdev, "BIT signature found\n"); 185 186 /* determine the vbios version number */ 187 if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) { 188 bios->version.major = nvbios_rd08(bios, bit_i.offset + 3); 189 bios->version.chip = nvbios_rd08(bios, bit_i.offset + 2); 190 bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1); 191 bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0); 192 bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4); 193 } else 194 if (bmp_version(bios)) { 195 bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13); 196 bios->version.chip = nvbios_rd08(bios, bios->bmp_offset + 12); 197 bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11); 198 bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10); 199 } 200 201 nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n", 202 bios->version.major, bios->version.chip, 203 bios->version.minor, bios->version.micro, bios->version.patch); 204 return 0; 205 } 206