[PATCH V2] amdgpu/drm: Refine the way to check
Ken Xue
kxue at amd.com
Tue Dec 20 18:08:03 UTC 2016
The 12/21/2016 10:44, Nils Wallménius wrote:
> Hi Ken, a comment below
>
>
> Den 21 dec. 2016 08:19 skrev "Xue, Ken" <Ken.Xue at amd.com>:
>
> There are several ways to check out a ATOMBIOS. In previous codes, try
> a new way to fetch out vbios/rom, until current vbios/rom is started with
> 0x55AA, then check if this vbios is ATOMBIOS. Now, try a new way to fetch
> out vbios until all flags of ATOMBIOS are verified.
>
> Signed-off-by: Ken Xue <Ken.Xue at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c | 174
> ++++++++++++++++-------------
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 +-
> 2 files changed, 102 insertions(+), 80 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
> index 4f973a9..a6fa91f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
> @@ -42,6 +42,44 @@
> #define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
> #define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
>
> +/* Check if current bios is an ATOM BIOS.
> + * Return true if it is ATOM BIOS. Otherwise, return false.
> + */
> +static bool check_atom_bios(uint8_t *bios, size_t size)
> +{
> + uint16_t tmp, bios_header_start;
> +
> + if (!bios || size < 0x49) {
> + DRM_INFO("vbios mem is null or mem size is wrong\n");
> + return false;
> + }
> +
> + if (!AMD_IS_VALID_VBIOS(bios)) {
> + DRM_INFO("BIOS signature incorrect %x %x\n", bios[0],
> bios[1]);
> + return false;
> + }
> +
> + tmp = bios[0x18] | (bios[0x19] << 8);
> + if (bios[tmp + 0x14] != 0x0) {
> + DRM_INFO("Not an x86 BIOS ROM\n");
> + return false;
> + }
> +
> + bios_header_start = bios[0x48] | (bios[0x49] << 8);
> + if (!bios_header_start) {
> + DRM_INFO("Can't locate bios header\n");
> + return false;
> + }
> + tmp = bios_header_start + 4;
> + if (!memcmp(bios + tmp, "ATOM", 4) ||
> + !memcmp(bios + tmp, "MOTA", 4) ||
> + (size < tmp))
>
>
> Is the last condition here correct? Can you have valid atombios without the
> signature? Maybe add a comment if that's true. Also the extra parents
> aren't necessary.
>
> Best regards
> Nils
>
Thanks for your comments. It should be a mistake.
if (size < tmp) {
DRM_INFO("BIOS header is broken\n");
return false;
}
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