mirrors/Zag
1
0
Fork 0
mirror of https://github.com/rdmsr/zag.git synced 2026-10-31 07:18:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

ke: optimize IPL operations

Browse Source
This commit is contained in:
Loïc Grégoire
2026-08-07 15:41:12 -04:00
parent 5bb264a9ae
commit 52f62b8354
5 changed files with 105 additions and 46 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/kern/amd64/impl.zig
+27
View File
@@ -146,3 +146,30 @@ pub inline fn flush_full_tlb() void {
pub inline fn flush_tlb(va: r.VAddr) void {
amd64.invlpg(va);
}
// Inline asm so the compiler has a chance to inline it.
pub inline fn raise_software_ipl(new: ke.Ipl, old: *ke.Ipl) bool {
return asm volatile (
\\movb %%gs:cpu_ipl, %%cl
\\movb %%cl, (%[old_ptr])
\\movb %[new_val], %%gs:cpu_ipl
\\cmpb %%cl, %[new_val]
\\setl %[result]
: [result] "=r" (-> bool),
: [new_val] "r" (new),
[old_ptr] "r" (old),
: .{ .rcx = true, .memory = true });
}
pub inline fn lower_software_ipl(new: ke.Ipl, old: *ke.Ipl) bool {
return asm volatile (
\\movb %%gs:cpu_ipl, %%cl
\\movb %%cl, (%[old_ptr])
\\movb %[new_val], %%gs:cpu_ipl
\\cmpb %[new_val], %%cl
\\setl %[result]
: [result] "=r" (-> bool),
: [new_val] "r" (new),
[old_ptr] "r" (old),
: .{ .rcx = true, .memory = true });
}