Daniel Samson
15b70856c9
Two driver-model milestones plus a tree-wide naming pass. Suite 35/35 (QEMU) + host tests green. M11 — IRQ-as-IPC. A ring-3 driver now sleeps until its device interrupts it. New src/kernel/irq.zig: per-GSI endpoint bindings, comptime per-vector trampolines, dispatch = mask GSI -> LAPIC EOI -> notifyLocked, all under one lock region. irq_bind/irq_ack syscalls, gated by the device claim like mmio_map. interruptDispatch no longer EOIs — each handler owns its EOI, because a level line must be masked before it is acknowledged (irq_ack is the unmask). Bindings are keyed on the owning task and released on exit (a shared endpoint's siblings survive). hpetd rewritten interrupt-driven. Tests: hpet (rewritten, reads back the I/O APIC routing) and irqfree. M12 — bus drivers. DeviceDesc gains a parent, making the device table a tree. dev_register (device_register) lets a process publish children below a device it claimed; the kernel enforces resource containment (a child's resources must nest in its parent's), so a descriptor can't fabricate a window over kernel RAM. Descriptor copied in via copyFromUser (physmap walk — an unmapped user pointer fails the call instead of faulting the kernel). Per-parent child cap bounds table exhaustion. sbin/busd.zig is a worked bus driver. Test: bus. Naming — per docs/coding-standards.md: non-acronym abbreviations spelled out (message, descriptor, device_service, scheduler, runtime, physical, interpreter, ...); acronyms kept (IPC, MMIO, DMA, HCD, ...); files are kebab-case (ipc-synchronous.zig, device-service.zig, vfs-protocol.zig, ...). Exceptions: POSIX/C ABI names and Zig idioms (init/len/ptr) kept. Module collisions resolved by specific naming (config -> parameters, device.zig alias -> device_model). AML op/Op disambiguated: op = opcode, Op = operation; per-opcode parse handlers renamed opX -> parseX. New driver docs: drivers.md, driver-model.md (bus/class/HCD shapes + the proposed M13–M16 ABI), coding-standards.md.
53 lines
2.3 KiB
Zig
53 lines
2.3 KiB
Zig
//! Raw `system_call` instruction wrappers for user space — one per arity.
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//!
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//! ABI: number in rax, arguments in rdi, rsi, rdx, r10, r8, r9, result in rax.
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//! The `system_call` instruction itself clobbers rcx (it holds the return rip) and
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//! r11 (the saved rflags); the kernel entry stub preserves everything else.
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//! Note argument #3 goes in **r10, not rcx** — rcx is unavailable across the
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//! instruction, so the kernel reads the 4th argument from r10.
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const danos = @import("danos");
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const SystemCall = danos.SystemCall;
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pub inline fn systemCall0(n: SystemCall) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall1(n: SystemCall, a0: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)), [a0] "{rdi}" (a0),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall2(n: SystemCall, a0: usize, a1: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall3(n: SystemCall, a0: usize, a1: usize, a2: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1), [a2] "{rdx}" (a2),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall4(n: SystemCall, a0: usize, a1: usize, a2: usize, a3: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1), [a2] "{rdx}" (a2), [a3] "{r10}" (a3),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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pub inline fn systemCall5(n: SystemCall, a0: usize, a1: usize, a2: usize, a3: usize, a4: usize) usize {
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return asm volatile ("syscall"
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: [ret] "={rax}" (-> usize),
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: [n] "{rax}" (@intFromEnum(n)), [a0] "{rdi}" (a0), [a1] "{rsi}" (a1), [a2] "{rdx}" (a2), [a3] "{r10}" (a3), [a4] "{r8}" (a4),
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: .{ .rcx = true, .r11 = true, .memory = true });
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}
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