52 lines
989 B
Zig
52 lines
989 B
Zig
const SystemCall = enum(u64) {
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Print,
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AllocFrame,
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LockFrame,
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FreeFrame,
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Yield,
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SetPriority,
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GetPriority,
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};
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const SystemError = error{
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OutOfMemory,
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};
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fn syscall(num: SystemCall, arg: u64) i64 {
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return asm volatile ("int $66"
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: [result] "=r" (-> i64),
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: [num] "{rax}" (@intFromEnum(num)),
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[arg] "{rdi}" (arg),
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);
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}
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pub fn print(arg: u64) void {
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_ = syscall(.Print, arg);
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}
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pub fn allocFrame() !usize {
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const retval = syscall(.AllocFrame, 0);
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if (retval < 0) return error.OutOfMemory;
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return @bitCast(retval);
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}
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pub fn lockFrame(address: u64) void {
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_ = syscall(.LockFrame, address);
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}
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pub fn freeFrame(address: u64) void {
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_ = syscall(.FreeFrame, address);
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}
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pub fn yield() void {
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_ = syscall(.Yield, 0);
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}
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pub fn setPriority(priority: u8) void {
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_ = syscall(.SetPriority, priority);
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}
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pub fn getPriority() u8 {
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return @truncate(@as(u64, @bitCast(syscall(.GetPriority, 0))));
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}
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