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 nvbios_addr(struct nvkm_bios * bios,u32 * addr,u8 size)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 void * nvbios_pointer(struct nvkm_bios * bios,u32 addr)50 nvbios_pointer(struct nvkm_bios *bios, u32 addr) 51 { 52 if (likely(nvbios_addr(bios, &addr, 0))) 53 return &bios->data[addr]; 54 return NULL; 55 } 56 57 u8 nvbios_rd08(struct nvkm_bios * bios,u32 addr)58 nvbios_rd08(struct nvkm_bios *bios, u32 addr) 59 { 60 if (likely(nvbios_addr(bios, &addr, 1))) 61 return bios->data[addr]; 62 return 0x00; 63 } 64 65 u16 nvbios_rd16(struct nvkm_bios * bios,u32 addr)66 nvbios_rd16(struct nvkm_bios *bios, u32 addr) 67 { 68 if (likely(nvbios_addr(bios, &addr, 2))) 69 return get_unaligned_le16(&bios->data[addr]); 70 return 0x0000; 71 } 72 73 u32 nvbios_rd32(struct nvkm_bios * bios,u32 addr)74 nvbios_rd32(struct nvkm_bios *bios, u32 addr) 75 { 76 if (likely(nvbios_addr(bios, &addr, 4))) 77 return get_unaligned_le32(&bios->data[addr]); 78 return 0x00000000; 79 } 80 81 u8 nvbios_checksum(const u8 * data,int size)82 nvbios_checksum(const u8 *data, int size) 83 { 84 u8 sum = 0; 85 while (size--) 86 sum += *data++; 87 return sum; 88 } 89 90 u16 nvbios_findstr(const u8 * data,int size,const char * str,int len)91 nvbios_findstr(const u8 *data, int size, const char *str, int len) 92 { 93 int i, j; 94 95 for (i = 0; i <= (size - len); i++) { 96 for (j = 0; j < len; j++) 97 if ((char)data[i + j] != str[j]) 98 break; 99 if (j == len) 100 return i; 101 } 102 103 return 0; 104 } 105 106 int nvbios_memcmp(struct nvkm_bios * bios,u32 addr,const char * str,u32 len)107 nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len) 108 { 109 unsigned char c1, c2; 110 111 while (len--) { 112 c1 = nvbios_rd08(bios, addr++); 113 c2 = *(str++); 114 if (c1 != c2) 115 return c1 - c2; 116 } 117 return 0; 118 } 119 120 int nvbios_extend(struct nvkm_bios * bios,u32 length)121 nvbios_extend(struct nvkm_bios *bios, u32 length) 122 { 123 if (bios->size < length) { 124 u8 *prev = bios->data; 125 if (!(bios->data = kmalloc(length, GFP_KERNEL))) { 126 bios->data = prev; 127 return -ENOMEM; 128 } 129 memcpy(bios->data, prev, bios->size); 130 bios->size = length; 131 kfree(prev); 132 return 1; 133 } 134 return 0; 135 } 136 137 static void * nvkm_bios_dtor(struct nvkm_subdev * subdev)138 nvkm_bios_dtor(struct nvkm_subdev *subdev) 139 { 140 struct nvkm_bios *bios = nvkm_bios(subdev); 141 kfree(bios->data); 142 return bios; 143 } 144 145 static const struct nvkm_subdev_func 146 nvkm_bios = { 147 .dtor = nvkm_bios_dtor, 148 }; 149 150 int nvkm_bios_new(struct nvkm_device * device,enum nvkm_subdev_type type,int inst,struct nvkm_bios ** pbios)151 nvkm_bios_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst, 152 struct nvkm_bios **pbios) 153 { 154 struct nvkm_bios *bios; 155 struct nvbios_image image; 156 struct bit_entry bit_i; 157 int ret, idx = 0; 158 159 if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL))) 160 return -ENOMEM; 161 nvkm_subdev_ctor(&nvkm_bios, device, type, inst, &bios->subdev); 162 163 ret = nvbios_shadow(bios); 164 if (ret) 165 return ret; 166 167 /* Some tables have weird pointers that need adjustment before 168 * they're dereferenced. I'm not entirely sure why... 169 */ 170 if (nvbios_image(bios, idx++, &image)) { 171 bios->image0_size = image.size; 172 while (nvbios_image(bios, idx++, &image)) { 173 if (image.type == 0xe0) { 174 bios->imaged_addr = image.base; 175 break; 176 } 177 } 178 } 179 180 /* detect type of vbios we're dealing with */ 181 bios->bmp_offset = nvbios_findstr(bios->data, bios->size, 182 "\xff\x7f""NV\0", 5); 183 if (bios->bmp_offset) { 184 nvkm_debug(&bios->subdev, "BMP version %x.%x\n", 185 bmp_version(bios) >> 8, 186 bmp_version(bios) & 0xff); 187 } 188 189 bios->bit_offset = nvbios_findstr(bios->data, bios->size, 190 "\xff\xb8""BIT", 5); 191 if (bios->bit_offset) 192 nvkm_debug(&bios->subdev, "BIT signature found\n"); 193 194 /* determine the vbios version number */ 195 if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) { 196 bios->version.major = nvbios_rd08(bios, bit_i.offset + 3); 197 bios->version.chip = nvbios_rd08(bios, bit_i.offset + 2); 198 bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1); 199 bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0); 200 bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4); 201 } else 202 if (bmp_version(bios)) { 203 bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13); 204 bios->version.chip = nvbios_rd08(bios, bios->bmp_offset + 12); 205 bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11); 206 bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10); 207 } 208 209 nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n", 210 bios->version.major, bios->version.chip, 211 bios->version.minor, bios->version.micro, bios->version.patch); 212 return 0; 213 } 214