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0731742a XL |
1 | // This defines the amd64 target for UEFI systems as described in the UEFI specification. See the |
2 | // uefi-base module for generic UEFI options. On x86_64 systems (mostly called "x64" in the spec) | |
3 | // UEFI systems always run in long-mode, have the interrupt-controller pre-configured and force a | |
4 | // single-CPU execution. | |
5 | // The win64 ABI is used. It differs from the sysv64 ABI, so we must use a windows target with | |
6 | // LLVM. "x86_64-unknown-windows" is used to get the minimal subset of windows-specific features. | |
7 | ||
136023e0 | 8 | use crate::spec::Target; |
0731742a | 9 | |
29967ef6 | 10 | pub fn target() -> Target { |
ba9703b0 | 11 | let mut base = super::uefi_msvc_base::opts(); |
ee023bcb | 12 | base.cpu = "x86-64".into(); |
0731742a XL |
13 | base.max_atomic_width = Some(64); |
14 | ||
9fa01778 XL |
15 | // We disable MMX and SSE for now, even though UEFI allows using them. Problem is, you have to |
16 | // enable these CPU features explicitly before their first use, otherwise their instructions | |
17 | // will trigger an exception. Rust does not inject any code that enables AVX/MMX/SSE | |
18 | // instruction sets, so this must be done by the firmware. However, existing firmware is known | |
19 | // to leave these uninitialized, thus triggering exceptions if we make use of them. Which is | |
20 | // why we avoid them and instead use soft-floats. This is also what GRUB and friends did so | |
21 | // far. | |
136023e0 | 22 | // |
9fa01778 XL |
23 | // If you initialize FP units yourself, you can override these flags with custom linker |
24 | // arguments, thus giving you access to full MMX/SSE acceleration. | |
ee023bcb | 25 | base.features = "-mmx,-sse,+soft-float".into(); |
0731742a | 26 | |
29967ef6 | 27 | Target { |
ee023bcb | 28 | llvm_target: "x86_64-unknown-windows".into(), |
29967ef6 | 29 | pointer_width: 64, |
dfeec247 | 30 | data_layout: "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" |
ee023bcb FG |
31 | .into(), |
32 | arch: "x86_64".into(), | |
0731742a XL |
33 | |
34 | options: base, | |
29967ef6 | 35 | } |
0731742a | 36 | } |