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//! Segment Register Operations
pub fn reload_code_segment(code_selector: u16) void {
asm volatile (
\\push %[code_sel]
\\lea 1f(%%rip), %%rax
\\push %%rax
\\lretq
\\1:
:
: [code_sel] "r" (@as(u64, code_selector)),
: .{ .rax = true, .memory = true });
}
pub fn reload_data_segments(data_selector: u16) void {
asm volatile (
\\mov %[data_sel], %%ax
\\mov %%ax, %%ds
\\mov %%ax, %%es
\\mov %%ax, %%fs
\\mov %%ax, %%gs
\\mov %%ax, %%ss
:
: [data_sel] "r" (data_selector),
: .{ .rax = true, .memory = true });
}
pub fn load_tss(tss_selector: u16) void {
asm volatile ("ltr %[sel]"
:
: [sel] "r" (tss_selector),
);
}
pub fn get_cs() u16 {
var cs: u16 = undefined;
asm volatile ("mov %%cs, %[cs]"
: [cs] "=r" (cs),
);
return cs;
}
pub fn get_ds() u16 {
var ds: u16 = undefined;
asm volatile ("mov %%ds, %[ds]"
: [ds] "=r" (ds),
);
return ds;
}
pub fn get_ss() u16 {
var ss: u16 = undefined;
asm volatile ("mov %%ss, %[ss]"
: [ss] "=r" (ss),
);
return ss;
}
pub fn get_es() u16 {
var es: u16 = undefined;
asm volatile ("mov %%es, %[es]"
: [es] "=r" (es),
);
return es;
}
pub fn get_fs() u16 {
var fs: u16 = undefined;
asm volatile ("mov %%fs, %[fs]"
: [fs] "=r" (fs),
);
return fs;
}
pub fn get_gs() u16 {
var gs: u16 = undefined;
asm volatile ("mov %%gs, %[gs]"
: [gs] "=r" (gs),
);
return gs;
}
|
