1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
//
// SPDX-License-Identifier: AGPL-3.0-or-later
const std = @import("std");
const Console = @import("lib/Console.zig");
const hwinfo = @import("lib/hwinfo.zig");
const instructions = @import("lib/instructions.zig");
const interrupts = @import("lib/interrupts.zig");
const mem = @import("lib/mem.zig");
const paging = @import("lib/paging.zig");
const pci = @import("lib/pci.zig");
const plic = @import("lib/plic.zig");
const process = @import("lib/process.zig");
const Error = error{
HartIdOutOfRange,
};
const HartData = packed struct(usize) {
hart_id: u16,
reserved: u48,
pub inline fn loadSScratch() HartData {
return asm volatile (
\\ csrr %[hart_data], sscratch
: [hart_data] "=r" (-> HartData),
);
}
pub inline fn storeSScratch(self: HartData) void {
asm volatile (
\\ csrw sscratch, %[hart_data]
:
: [hart_data] "r" (self),
);
}
};
pub fn panic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace, ret_addr: ?usize) noreturn {
_ = &error_return_trace;
_ = &ret_addr;
@setCold(true);
const console = Console.autoChoose() orelse while (true) asm volatile ("wfi");
const w = console.writer();
w.print("\r\n", .{}) catch while (true) asm volatile ("wfi");
w.print("= !! ========== !! =\r\n", .{}) catch while (true) asm volatile ("wfi");
w.print("!!! KERNEL PANIC !!!\r\n", .{}) catch while (true) asm volatile ("wfi");
w.print("{s}\r\n", .{msg}) catch while (true) asm volatile ("wfi");
w.print("= !! ========== !! =\r\n", .{}) catch while (true) asm volatile ("wfi");
while (true) {
asm volatile ("wfi");
}
}
export fn _start() callconv(.Naked) noreturn {
// Stack grows down, use (exclusive) end instead of start.
asm volatile (
\\ .option push
\\ .option norelax
\\ la gp, _global_pointer
\\ .option pop
\\
\\ la sp, _stack_end
\\ j %[function]
:
: [function] "s" (&kmain),
);
}
fn kmain(hart_id: usize, _: usize) noreturn {
run(hart_id) catch |err| std.debug.panic("Hart {d}: {any}", .{ hart_id, err });
}
fn run(hart_id: usize) !noreturn {
if (hart_id > ~@as(u16, 0)) return Error.HartIdOutOfRange;
const hart_data = HartData{
.hart_id = @intCast(hart_id),
.reserved = 0,
};
hart_data.storeSScratch();
paging.init();
const kmem: *paging.Table = @alignCast(@ptrCast(try paging.zeroedAlloc(1)));
try kmem.mapKernel();
instructions.satp.write(kmem.satp(0));
asm volatile (
\\ la sp, _stack_end
\\ j %[function]
:
: [function] "s" (&pagedStart),
);
unreachable;
}
fn pagedStart() callconv(.Naked) noreturn {
asm volatile (
\\ la sp, _stack_end
\\ j %[function]
:
: [function] "s" (&pagedMain),
);
}
fn pagedMain() noreturn {
pagedRun() catch |err| std.debug.panic("Paged: {any}", .{err});
}
fn pagedRun() !noreturn {
const console = Console.autoChoose() orelse while (true) asm volatile ("wfi");
const w = console.writer();
try w.print("\r\n", .{});
try w.print("Console init\r\n", .{});
try w.print("\r\n", .{});
const hart_data = HartData.loadSScratch();
try w.print("Hart : {d}\r\n", .{hart_data.hart_id});
const kmem: *paging.Table = @ptrFromInt(instructions.satp.read().ppn << 12);
try w.print("Paging : Sv39\r\n", .{});
interrupts.init();
instructions.sie.write(interrupts.Enable.all);
try w.print("Interrupts : All\r\n", .{});
try w.print("\r\n", .{});
var chunk_allocator = try mem.ChunkAllocator(.{ .auto_merge_free = true }).init(128);
const allocator = chunk_allocator.allocator();
try w.print("\r\n", .{});
try w.print("===================== Kernel Page Table =====================\r\n", .{});
try w.print(".text: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (r-x)\r\n", .{ @intFromPtr(paging.text_start), @intFromPtr(paging.text_end) });
try w.print(".rodata: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (r--)\r\n", .{ @intFromPtr(paging.rodata_start), @intFromPtr(paging.rodata_end) });
try w.print(".data: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (rw-)\r\n", .{ @intFromPtr(paging.data_start), @intFromPtr(paging.data_end) });
try w.print(".bss: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (rw-)\r\n", .{ @intFromPtr(paging.bss_start), @intFromPtr(paging.bss_end) });
try w.print("Stack: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (rw-)\r\n", .{ @intFromPtr(paging.stack_start), @intFromPtr(paging.stack_end) });
try w.print("Trap Stack: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (rw-)\r\n", .{ @intFromPtr(paging.stvec_stack_start), @intFromPtr(paging.stvec_stack_end) });
try w.print("\r\n", .{});
try w.print("Heap: 0x{x:0>8} - 0x{x:0>8} -> identity mapped (rw-)\r\n", .{ @intFromPtr(paging.heap_start), @intFromPtr(paging.heap_end) });
try w.print("=============================================================\r\n", .{});
try w.print("\r\n", .{});
try w.print("Timer : {d} Hz\r\n", .{1 / (@as(f64, process.schedule_interval_millis) / 1000)});
var plic_dev = try hwinfo.byKind(.plic);
if (try plic_dev.next()) |plic_handle| {
_ = &plic_handle;
try w.print("PLIC : Disabled\r\n", .{});
} else {
try w.print("PLIC : Not present\r\n", .{});
}
try w.print("\r\n", .{});
if (pci.controllerFromHwInfo(kmem)) |pci_controller| {
for (0..256) |bus| {
for (0..32) |device| {
const cfg_space = pci_controller.cfgSpace(@intCast(bus), @intCast(device), 0);
const vendor_id = cfg_space.getVendorId();
const device_id = cfg_space.getDeviceId();
const class = cfg_space.getClass();
const subclass = cfg_space.getSubclass();
if (vendor_id != 0xffff) {
try w.print("PCI {:0>3}.{:0>3}: Vendor = 0x{x:0>4}, Device = 0x{x:0>4}, Class = 0x{x:0>4}, Subclass = 0x{x:0>4}\r\n", .{ bus, device, vendor_id, device_id, class, subclass });
}
}
}
try w.print("\r\n", .{});
} else |err| {
switch (err) {
error.NoPciController => try w.print("PCI not present\r\n", .{}),
else => return err,
}
}
try w.print("Enter process demo\r\n", .{});
try process.demo(allocator);
while (true) {
asm volatile ("wfi");
}
}
|
