invoxiplaygames.uk
+169
Cargo.lock
+169
Cargo.lock
···
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+9
Cargo.toml
+9
Cargo.toml
+19
README.md
+19
README.md
···
1
+
# amd-brand-string-edit
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+
UEFI utility to edit the brand string of AMD processors (Family 10h through
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+
Family 19h) via the `Core::X86::Msr::ProcNameString` Machine State Registers.
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This is temporary and doesn't modify the CPU in any way, and the change is
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+
purely aesthetic. This does not work on Intel, TransMeta, WinChip, or VIA CPUs.
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## Usage
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+
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Replace the brand string in `src/main.rs` with your desired brand string, then
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run `cargo build --release --target x86_64-unknown-uefi`. Run the output .efi
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file (`target/x86_64-unknown-uefi/amd-brand-string-edit.efi`) on the computer
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via either an EFI shell or with the boot picker and the file located at
19
+
`EFI/Boot/bootx64.efi` on removable storage.
media/uefi_output.png
media/uefi_output.png
This is a binary file and will not be displayed.
media/windows_display.png
media/windows_display.png
This is a binary file and will not be displayed.
+78
src/main.rs
+78
src/main.rs
···
1
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#![no_main]
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#![no_std]
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+
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+
// CHANGE ME!
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// new brand string must be EXACTLY 48 characters (pad with spaces)
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+
static NEW_BRAND_STRING: &'static str = "Lappy 486 ";
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+
// 48 character reference: ------------------------------------------------
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+
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+
use uefi::print;
10
+
use uefi::prelude::*;
11
+
use x86::cpuid::CpuId;
12
+
use core::arch::asm;
13
+
use core::convert::TryInto;
14
+
15
+
unsafe fn wrmsr_amd(msr: u32, value: u64) {
16
+
let low = value as u32;
17
+
let high = (value >> 32) as u32;
18
+
// wrmsr with the AMD "secret" key - not necessary for these MSRs
19
+
let secret = 0x9c5a203a as u32;
20
+
unsafe {
21
+
asm!("wrmsr", in("ecx") msr, in("eax") low, in("edx") high, in("edi") secret);
22
+
}
23
+
}
24
+
25
+
pub fn brand_string_to_int64(brand_str: &str) -> Option<[u64; 6]> {
26
+
// make sure we have exactly 48 characters for the brand string
27
+
if brand_str.len() != 48 {
28
+
return None
29
+
}
30
+
let str_bytes = brand_str.as_bytes();
31
+
let mut out = [0u64; 6];
32
+
// convert it to an array of 6 LE integers
33
+
// does rust seriously not support for loops
34
+
let mut i = 0;
35
+
while i < 6 {
36
+
let start = i * 8;
37
+
let chunk: [u8; 8] = str_bytes[start..start + 8].try_into().unwrap();
38
+
out[i] = u64::from_le_bytes(chunk);
39
+
i += 1;
40
+
}
41
+
Some(out)
42
+
}
43
+
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+
#[entry]
45
+
fn main() -> Status {
46
+
uefi::helpers::init().unwrap();
47
+
// get the vendor (we only work on AMD)
48
+
let cpu_id = CpuId::new();
49
+
let vendor_name = cpu_id.get_vendor_info().unwrap();
50
+
print!("CPU vendor: {}\n", vendor_name.as_str());
51
+
if vendor_name.as_str() == "AuthenticAMD" {
52
+
// get the current CPU brand string
53
+
let old_brand_string = cpu_id.get_processor_brand_string().unwrap();
54
+
print!("Current brand: \"{}\"\n", old_brand_string.as_str());
55
+
// convert to integers to set in the MSRs
56
+
match brand_string_to_int64(NEW_BRAND_STRING) {
57
+
None => print!("Invalid format for brand string\n\"{}\".\n", NEW_BRAND_STRING),
58
+
Some(ints) => {
59
+
// set the Core::X86::Msr::ProcNameString registers to our new string
60
+
let mut i = 0;
61
+
while i < 6 {
62
+
unsafe {
63
+
wrmsr_amd(0xC0010030 + i, ints[i as usize]);
64
+
}
65
+
i += 1;
66
+
}
67
+
// verify that the string has actually changed
68
+
let verify_brand_string = cpu_id.get_processor_brand_string().unwrap();
69
+
print!("New brand: \"{}\"\n", verify_brand_string.as_str());
70
+
}
71
+
}
72
+
} else {
73
+
print!("This program only supports AuthenticAMD.\n");
74
+
}
75
+
// stall for 7 seconds to let you read the console output
76
+
boot::stall(7_000_000);
77
+
Status::SUCCESS
78
+
}