206 lines
5.2 KiB
C
206 lines
5.2 KiB
C
/*
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* Copyright 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs
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*/
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#include "priv.h"
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#include <subdev/bios.h>
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#include <subdev/bios/bmp.h>
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#include <subdev/bios/bit.h>
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#include <subdev/bios/image.h>
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static bool
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nvbios_addr(struct nvkm_bios *bios, u32 *addr, u8 size)
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{
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u32 p = *addr;
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if (*addr >= bios->image0_size && bios->imaged_addr) {
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*addr -= bios->image0_size;
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*addr += bios->imaged_addr;
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}
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if (unlikely(*addr + size > bios->size)) {
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nvkm_error(&bios->subdev, "OOB %d %08x %08x\n", size, p, *addr);
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return false;
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}
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return true;
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}
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u8
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nvbios_rd08(struct nvkm_bios *bios, u32 addr)
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{
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if (likely(nvbios_addr(bios, &addr, 1)))
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return bios->data[addr];
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return 0x00;
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}
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u16
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nvbios_rd16(struct nvkm_bios *bios, u32 addr)
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{
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if (likely(nvbios_addr(bios, &addr, 2)))
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return get_unaligned_le16(&bios->data[addr]);
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return 0x0000;
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}
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u32
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nvbios_rd32(struct nvkm_bios *bios, u32 addr)
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{
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if (likely(nvbios_addr(bios, &addr, 4)))
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return get_unaligned_le32(&bios->data[addr]);
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return 0x00000000;
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}
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u8
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nvbios_checksum(const u8 *data, int size)
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{
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u8 sum = 0;
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while (size--)
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sum += *data++;
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return sum;
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}
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u16
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nvbios_findstr(const u8 *data, int size, const char *str, int len)
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{
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int i, j;
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for (i = 0; i <= (size - len); i++) {
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for (j = 0; j < len; j++)
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if ((char)data[i + j] != str[j])
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break;
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if (j == len)
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return i;
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}
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return 0;
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}
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int
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nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len)
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{
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unsigned char c1, c2;
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while (len--) {
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c1 = nvbios_rd08(bios, addr++);
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c2 = *(str++);
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if (c1 != c2)
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return c1 - c2;
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}
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return 0;
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}
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int
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nvbios_extend(struct nvkm_bios *bios, u32 length)
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{
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if (bios->size < length) {
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u8 *prev = bios->data;
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if (!(bios->data = kmalloc(length, GFP_KERNEL))) {
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bios->data = prev;
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return -ENOMEM;
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}
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memcpy(bios->data, prev, bios->size);
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bios->size = length;
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kfree(prev);
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return 1;
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}
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return 0;
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}
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static void *
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nvkm_bios_dtor(struct nvkm_subdev *subdev)
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{
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struct nvkm_bios *bios = nvkm_bios(subdev);
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kfree(bios->data);
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return bios;
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}
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static const struct nvkm_subdev_func
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nvkm_bios = {
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.dtor = nvkm_bios_dtor,
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};
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int
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nvkm_bios_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
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struct nvkm_bios **pbios)
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{
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struct nvkm_bios *bios;
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struct nvbios_image image;
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struct bit_entry bit_i;
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int ret, idx = 0;
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if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL)))
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return -ENOMEM;
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nvkm_subdev_ctor(&nvkm_bios, device, type, inst, &bios->subdev);
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ret = nvbios_shadow(bios);
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if (ret)
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return ret;
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/* Some tables have weird pointers that need adjustment before
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* they're dereferenced. I'm not entirely sure why...
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*/
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if (nvbios_image(bios, idx++, &image)) {
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bios->image0_size = image.size;
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while (nvbios_image(bios, idx++, &image)) {
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if (image.type == 0xe0) {
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bios->imaged_addr = image.base;
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break;
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}
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}
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}
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/* detect type of vbios we're dealing with */
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bios->bmp_offset = nvbios_findstr(bios->data, bios->size,
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"\xff\x7f""NV\0", 5);
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if (bios->bmp_offset) {
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nvkm_debug(&bios->subdev, "BMP version %x.%x\n",
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bmp_version(bios) >> 8,
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bmp_version(bios) & 0xff);
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}
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bios->bit_offset = nvbios_findstr(bios->data, bios->size,
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"\xff\xb8""BIT", 5);
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if (bios->bit_offset)
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nvkm_debug(&bios->subdev, "BIT signature found\n");
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/* determine the vbios version number */
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if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) {
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bios->version.major = nvbios_rd08(bios, bit_i.offset + 3);
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bios->version.chip = nvbios_rd08(bios, bit_i.offset + 2);
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bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1);
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bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0);
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bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4);
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} else
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if (bmp_version(bios)) {
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bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13);
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bios->version.chip = nvbios_rd08(bios, bios->bmp_offset + 12);
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bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11);
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bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10);
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}
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nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n",
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bios->version.major, bios->version.chip,
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bios->version.minor, bios->version.micro, bios->version.patch);
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return 0;
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}
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