4 ms·

> GPT/UEFI are standards, they are not ruled by Microsoft - GPT partition uuid's with the "mixed endianess" from Windows COM: https://devblogs.microsoft.com/ol

> GPT/UEFI are standards, they are not ruled by Microsoft - GPT partition uuid's with the "mixed endianess" from Windows COM: https://devblogs.microsoft.com/oldnewthing/20220928-00/?p=107221 https://devblogs.microsoft.com/oldnewthing/20220928-00/?p=10... - ESP is the FAT filesystem, developed in 1977 for DOS - LFS vfat extensions so the ESP can have directory entries with lowercase letters or longer than 11 characters. This also pulls in the UCS-2 encoding. Stuff from Windows 95. - EFI executables are actually windows PE executables - ... which are hacked on top of a MS-DOS MZ executables (The "This program cannot be run in DOS mode" thing) - ... and use the Windows64 calling convention So formally, UEFI is not ruled by Microsoft. Somehow yet all this Windows/MS-DOS stuff ended up in it.

0dayz 3y ago
>GPT partition uuid's with the "mixed endianess" from Windows COM From the wikipedia[1]: >The binary encoding of UUIDs varies between systems. Variant 1 UUIDs, nowadays the most common variant, are encoded in a big-endian format. >Variant 2 UUIDs, historically used in Microsoft's COM/OLE libraries, use a little-endian format, but appear mixed-endian with the first three components of the UUID as little-endian and last two big-endian, due to the missing byte dashes when formatted as a string In other words, there are 2 variants, 2 is for Microsoft's COM/OLE, so it's not designed by Microsoft. >ESP is the FAT filesystem, developed in 1977 for DOS >LFS vfat extensions so the ESP can have directory entries with lowercase letters or longer than 11 characters. This also pulls in the UCS-2 encoding. Stuff from Windows 95. FAT is not govern by Microsoft, despite them being the original author, and even then FAT32 patents have expired[2]. >EFI executables are actually windows PE executables You would need to provide proper source for this, the only source I can only talks about boot loaders, which I would imagine is written with the OS in mind[3]. [1]https://en.wikipedia.org/wiki/Universally_unique_identifier#Encoding https://en.wikipedia.org/wiki/Universally_unique_identifier#... [2]https://en.wikipedia.org/wiki/File_Allocation_Table#Patents https://en.wikipedia.org/wiki/File_Allocation_Table#Patents [3]https://en.wikipedia.org/wiki/UEFI#Applications https://en.wikipedia.org/wiki/UEFI#Applications
- blueflow 3y ago
  You are wrong on the UUIDs, Variant 2 is what Microsoft did and got standardized after the fact. And here the history and current usage of the PE format: https://en.wikipedia.org/wiki/Portable_Executable https://en.wikipedia.org/wiki/Portable_Executable It was made for Windows 3.1.
  - 0dayz 3y ago
    If you read my comment or the Wikipedia page you'll see clear as day that varient 2 is meant for windows, so I dont get this correction. And again that source doesn't give me any evidence of your claim.

0dayz 3y ago

>GPT partition uuid's with the "mixed endianess" from Windows COM From the wikipedia[1]: >The binary encoding of UUIDs varies between systems. Variant 1 UUIDs, nowadays the most common variant, are encoded in a big-endian format. >Variant 2 UUIDs, historically used in Microsoft's COM/OLE libraries, use a little-endian format, but appear mixed-endian with the first three components of the UUID as little-endian and last two big-endian, due to the missing byte dashes when formatted as a string In other words, there are 2 variants, 2 is for Microsoft's COM/OLE, so it's not designed by Microsoft. >ESP is the FAT filesystem, developed in 1977 for DOS >LFS vfat extensions so the ESP can have directory entries with lowercase letters or longer than 11 characters. This also pulls in the UCS-2 encoding. Stuff from Windows 95. FAT is not govern by Microsoft, despite them being the original author, and even then FAT32 patents have expired[2]. >EFI executables are actually windows PE executables You would need to provide proper source for this, the only source I can only talks about boot loaders, which I would imagine is written with the OS in mind[3]. [1]https://en.wikipedia.org/wiki/Universally_unique_identifier#Encoding https://en.wikipedia.org/wiki/Universally_unique_identifier#... [2]https://en.wikipedia.org/wiki/File_Allocation_Table#Patents https://en.wikipedia.org/wiki/File_Allocation_Table#Patents [3]https://en.wikipedia.org/wiki/UEFI#Applications https://en.wikipedia.org/wiki/UEFI#Applications

blueflow 3y ago
You are wrong on the UUIDs, Variant 2 is what Microsoft did and got standardized after the fact. And here the history and current usage of the PE format: https://en.wikipedia.org/wiki/Portable_Executable https://en.wikipedia.org/wiki/Portable_Executable It was made for Windows 3.1.
- 0dayz 3y ago
  If you read my comment or the Wikipedia page you'll see clear as day that varient 2 is meant for windows, so I dont get this correction. And again that source doesn't give me any evidence of your claim.