vbios.c

[stalker.qa]

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

typedef uint32_t ULONG;
typedef uint8_t UCHAR;
typedef uint16_t USHORT;

typedef struct {
ULONG Signature;
ULONG TableLength; // Length
UCHAR Revision;
UCHAR Checksum;
UCHAR OemId[6];
UCHAR OemTableId[8]; // UINT64 OemTableId;
ULONG OemRevision;
ULONG CreatorId;
ULONG CreatorRevision;
} AMD_ACPI_DESCRIPTION_HEADER;

typedef struct {
AMD_ACPI_DESCRIPTION_HEADER SHeader;
UCHAR TableUUID[16]; // 0x24
ULONG VBIOSImageOffset; // 0x34. Offset to the first GOP_VBIOS_CONTENT block from the beginning of the stucture.
ULONG Lib1ImageOffset; // 0x38. Offset to the first GOP_LIB1_CONTENT block from the beginning of the stucture.
ULONG Reserved[4]; // 0x3C
} UEFI_ACPI_VFCT;

typedef struct {
ULONG PCIBus; // 0x4C
ULONG PCIDevice; // 0x50
ULONG PCIFunction; // 0x54
USHORT VendorID; // 0x58
USHORT DeviceID; // 0x5A
USHORT SSVID; // 0x5C
USHORT SSID; // 0x5E
ULONG Revision; // 0x60
ULONG ImageLength; // 0x64
} VFCT_IMAGE_HEADER;

typedef struct {
VFCT_IMAGE_HEADER VbiosHeader;
UCHAR VbiosContent[1];
} GOP_VBIOS_CONTENT;

int main(int argc, char** argv)
{
FILE* fp_vfct;
FILE* fp_vbios;
UEFI_ACPI_VFCT* pvfct;
char vbios_name[0x400];

if (!(fp_vfct = fopen("/sys/firmware/acpi/tables/VFCT", "r"))) {
perror(argv[0]);
return -1;
}

if (!(pvfct = malloc(sizeof(UEFI_ACPI_VFCT)))) {
perror(argv[0]);
return -1;
}

if (sizeof(UEFI_ACPI_VFCT) != fread(pvfct, 1, sizeof(UEFI_ACPI_VFCT), fp_vfct)) {
fprintf(stderr, "%s: failed to read VFCT header!\n", argv[0]);
return -1;
}

ULONG offset = pvfct->VBIOSImageOffset;
ULONG tbl_size = pvfct->SHeader.TableLength;

if (!(pvfct = realloc(pvfct, tbl_size))) {
perror(argv[0]);
return -1;
}

if (tbl_size - sizeof(UEFI_ACPI_VFCT) != fread(pvfct + 1, 1, tbl_size - sizeof(UEFI_ACPI_VFCT), fp_vfct)) {
fprintf(stderr, "%s: failed to read VFCT body!\n", argv[0]);
return -1;
}

fclose(fp_vfct);

while (offset < tbl_size) {
GOP_VBIOS_CONTENT* vbios = (GOP_VBIOS_CONTENT*)((char*)pvfct + offset);
VFCT_IMAGE_HEADER* vhdr = &vbios->VbiosHeader;

if (!vhdr->ImageLength)
break;

snprintf(vbios_name, sizeof(vbios_name), "vbios_%x_%x.bin", vhdr->VendorID, vhdr->DeviceID);

if (!(fp_vbios = fopen(vbios_name, "wb"))) {
perror(argv[0]);
return -1;
}

if (vhdr->ImageLength != fwrite(&vbios->VbiosContent, 1, vhdr->ImageLength, fp_vbios)) {
fprintf(stderr, "%s: failed to dump vbios %x:%x\n", argv[0], vhdr->VendorID, vhdr->DeviceID);
return -1;
}

fclose(fp_vbios);

printf("dump vbios %x:%x to %s\n", vhdr->VendorID, vhdr->DeviceID, vbios_name);

offset += sizeof(VFCT_IMAGE_HEADER);
offset += vhdr->ImageLength;
}

return 0;


Good afternoon, in which directory should I create this file and which command should I use to call it? Anyone will help

 

[news]

Why? and for What?

 

[stalker.qa]

Why? and for What?

To create a bios video

 

[news]

I don't understand. Is this for Proxmox VE relevant?
You post a c, c++ code, it will compiled to a binary code, with all around it may run on that cpu..

 

[stalker.qa]

I don't understand. Is this for Proxmox VE relevant?
You post a c, c++ code, it will compiled to a binary code, with all around it may run on that cpu..

I want to use this guide to make https://github.com/isc30/ryzen-7000-series-proxmox

it says there that you need to create a file in the proxmox host, but I don't know in which directory

 

[news]

Thanks, that's new for me.
Now it's clear.

 

[leesteken]

I want to use this guide to make https://github.com/isc30/ryzen-7000-series-proxmox

it says there that you need to create a file in the proxmox host, but I don't know in which directory

Look at that guide, it does not matter where you put it. You can just put it in the home directory for root: /root. Or even in /tmp, as you will need to compile it and run it and only the output file of that run needs to be stored in a specific place.

 

[stalker.qa]

Look at that guide, it does not matter where you put it. You can just put it in the home directory for root: /root. Or even in /tmp, as you will need to compile it and run it and only the output file of that run needs to be stored in a specific place.

So I created this file in tmp, but I don't know which command to specify, please help, I'm new to proxmox. And I couldn't find the info anywhere

 

[leesteken]

So I created this file in tmp, but I don't know which command to specify, please help, I'm new to proxmox. And I couldn't find the info anywhere

Maybe ask the person who created the guide? I have no experience with this.

 

[stalker.qa]

Maybe ask the person who created the guide? I have no experience with this.

gcc /tmp/vbios.c -o vbios
root@server:~# ./vbios
dump vbios 1002:1900 to vbios_1002_1900.bin

mv vbios_1002_1900.bin /usr/share/kvm/vbios_1002_1900.bin

Here is the correct command. I managed to do it