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// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
//
// SPDX-License-Identifier: AGPL-3.0-or-later
const instructions = @import("instructions.zig");
const paging = @import("paging.zig");
const process = @import("process.zig");
const sysexchange = @import("sysexchange.zig");
const trap = @import("trap.zig");
const vfs = @import("vfs.zig");
pub const Error = error{
UnknownSyscall,
};
pub fn handle(proc: *process.Info, trap_frame: *trap.Frame) !void {
switch (trap_frame.general_purpose_registers[17]) {
100000 => uprint(trap_frame),
100001 => open(proc, trap_frame),
100002 => close(trap_frame),
100003 => provideStream(trap_frame),
100004 => provideFile(trap_frame),
100005 => provideHook(trap_frame),
100006 => mkdir(trap_frame),
100007 => provideDirHook(trap_frame),
100008 => remove(trap_frame),
else => return Error.UnknownSyscall,
}
}
// uprint(str_addr: usize, len: usize) void
fn uprint(trap_frame: *const trap.Frame) void {
const procmem: *paging.Table = @ptrFromInt(instructions.satp.read().ppn << 12);
const paddr = procmem.translate(trap_frame.general_purpose_registers[10]).?;
const str_ptr: [*]const u8 = @ptrFromInt(paddr);
const str = str_ptr[0..trap_frame.general_purpose_registers[11]];
const w = @import("Console.zig").autoChoose().?.writer();
w.print("User message: {s}\r\n", .{str}) catch unreachable;
}
// open(path: [*:0]const u8, data: usize) Result(usize) // fixme: Kernel panic if null pointer
fn open(proc: *process.Info, trap_frame: *trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
const data = trap_frame.general_purpose_registers[11];
const user_info = vfs.openZ(path, proc.id, data) catch |err| {
sysexchange.frameReturn(usize, trap_frame, err);
return;
};
switch (user_info) {
.rd => |resource_descriptor| {
const maybe_handle = proc.makeRdHandle(resource_descriptor);
sysexchange.frameReturn(null, trap_frame, maybe_handle);
},
.value => |value| sysexchange.frameReturnResult(usize, trap_frame, value),
}
}
// close(rd: usize) void
fn close(trap_frame: *const trap.Frame) void {
const rd = trap_frame.general_purpose_registers[10];
_ = rd;
unreachable;
}
// provideStream(
// path: [*:0]const u8, // fixme: Kernel panic if null pointer
// readFn: ?vfs.Stream.ReadFn,
// writeFn: ?vfs.Stream.WriteFn,
// ) Result(void)
fn provideStream(trap_frame: *trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
const readFn: ?vfs.Stream.ReadFn = @ptrFromInt(trap_frame.general_purpose_registers[11]);
const writeFn: ?vfs.Stream.WriteFn = @ptrFromInt(trap_frame.general_purpose_registers[12]);
sysexchange.frameReturn(null, trap_frame, vfs.provideResourceZ(path, .{
.stream = .{
.readFn = readFn,
.writeFn = writeFn,
},
}));
}
// provideFile(
// path: [*:0]const u8, // fixme: Kernel panic if null pointer
// openFn: vfs.File.OpenFn,
// readFn: ?vfs.File.ReadFn,
// writeFn: ?vfs.File.WriteFn,
// closeFn: ?vfs.File.CloseFn,
// ) Result(void)
fn provideFile(trap_frame: *trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
const openFn: vfs.File.OpenFn = @ptrFromInt(trap_frame.general_purpose_registers[11]);
const readFn: ?vfs.File.ReadFn = @ptrFromInt(trap_frame.general_purpose_registers[12]);
const writeFn: ?vfs.File.WriteFn = @ptrFromInt(trap_frame.general_purpose_registers[13]);
const closeFn: ?vfs.File.CloseFn = @ptrFromInt(trap_frame.general_purpose_registers[14]);
sysexchange.frameReturn(null, trap_frame, vfs.provideResourceZ(path, .{
.file = .{
.openFn = openFn,
.readFn = readFn,
.writeFn = writeFn,
.closeFn = closeFn,
},
}));
}
// provideHook(
// path: [*:0]const u8, // fixme: Kernel panic if null pointer
// callback: vfs.Hook.Callback,
// ) Result(void)
fn provideHook(trap_frame: *trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
const callback: vfs.Hook.Callback = @ptrFromInt(trap_frame.general_purpose_registers[11]);
sysexchange.frameReturn(null, trap_frame, vfs.provideResourceZ(path, .{
.hook = .{
.callback = callback,
},
}));
}
// mkdir(
// path: [*:0]const u8, // fixme: Kernel panic if null pointer
// options: vfs.MkdirOptions,
// ) Result(void)
fn mkdir(trap_frame: *trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
const options: vfs.MkdirOptions = @bitCast(trap_frame.general_purpose_registers[11]);
_ = path;
_ = options;
unreachable;
}
// provideDirHook(
// path: [*:0]const u8, // fixme: Kernel panic if null pointer
// provideFn: vfs.DirHook.ProvideFn,
// findFn: vfs.DirHook.FindFn,
// removeFn: vfs.DirHook.RemoveFn,
// ) Result(void)
fn provideDirHook(trap_frame: *trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
const provideFn: vfs.DirHook.ProvideFn = @ptrFromInt(trap_frame.general_purpose_registers[11]);
const findFn: vfs.DirHook.FindFn = @ptrFromInt(trap_frame.general_purpose_registers[12]);
const removeFn: vfs.DirHook.RemoveFn = @ptrFromInt(trap_frame.general_purpose_registers[13]);
sysexchange.frameReturn(null, trap_frame, vfs.provideResourceZ(path, .{
.dir_hook = .{
.provideFn = provideFn,
.findFn = findFn,
.removeFn = removeFn,
},
}));
}
// remove(path: [*:0]const u8) Result(usize) // fixme: Kernel panic if null pointer
fn remove(trap_frame: *const trap.Frame) void {
const path: [*:0]const u8 = @ptrFromInt(trap_frame.general_purpose_registers[10]);
_ = path;
unreachable;
}
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