lspci done, console ok, printf formatting ok

README.md

@@ -7,9 +7,11 @@ slowly porting from rust.
  - vga frame buffer
  - ps2 keyboard driver
  - interrupts
- - todo: terminal console
+ - terminal console
+ - lspci
  - todo: memory mapping
  - todo: cfs scheduler
+ - todo: smp
 
 ### dependencies
 

run.sh

@@ -12,6 +12,7 @@ qemu() {
             -monitor unix:${QEMU_SOCKET},server,nowait\
             -display curses\
             -enable-kvm\
+            -device virtio-net,netdev=network0 -netdev tap,id=network0,ifname=tap0,script=no,downscript=no\
             $*
     }
 

src/arch/x86/lib/io.zig

@@ -1,26 +1,22 @@
-////
-// Read a byte from a port.
-//
-// Arguments:
-//     port: Port from where to read.
-//
-// Returns:
-//     The read byte.
-//
 pub inline fn inb(port: u16) u8 {
     return asm volatile ("inb %[port], %[result]"
         : [result] "={al}" (-> u8)
         : [port] "N{dx}" (port)
     );
 }
+pub inline fn inw(port: u16) u16 {
+    return asm volatile ("inw %[port], %[result]"
+        : [result] "={ax}" (-> u16)
+        : [port] "N{dx}" (port)
+    );
+}
+pub inline fn inl(port: u16) u32 {
+    return asm volatile ("inl %[port], %[result]"
+        : [result] "={eax}" (-> u32)
+        : [port] "N{dx}" (port)
+    );
+}
 
-////
-// Write a byte on a port.
-//
-// Arguments:
-//     port: Port where to write the value.
-//     value: Value to be written.
-//
 pub inline fn outb(port: u16, value: u8) void {
     asm volatile ("outb %[value], %[port]"
         :
@@ -28,3 +24,17 @@ pub inline fn outb(port: u16, value: u8) void {
           [port] "N{dx}" (port)
     );
 }
+pub inline fn outw(port: u16, value: u16) void {
+    asm volatile ("outw %[value], %[port]"
+        :
+        : [value] "{ax}" (value),
+          [port] "N{dx}" (port)
+    );
+}
+pub inline fn outl(port: u16, value: u32) void {
+    asm volatile ("outl %[value], %[port]"
+        :
+        : [value] "{eax}" (value),
+          [port] "N{dx}" (port)
+    );
+}

src/console.zig

@@ -1,14 +1,35 @@
 const interrupt = @import("arch/x86/interrupt.zig");
 const x86 = @import("arch/x86/lib/index.zig");
 const ps2 = @import("ps2.zig");
+const pci = @import("pci.zig");
+const std = @import("std");
+const mem = std.mem;
 use @import("vga.zig");
 
-var vga = VGA.init(VRAM_ADDR);
+var command: [10]u8 = undefined;
+var command_len: usize = 0;
+
+fn execute(com: []u8) void {
+    if (mem.eql(u8, com, "lspci")) pci.lspci();
+}
 
 pub fn keypress(char: u8) void {
-    vga.writeChar(char);
-    if (char == '\n')
+    // this is a custom "readline" capped at 10 characters
+    switch (char) {
+        '\n' => {
+            vga.writeChar('\n');
+            execute(command[0..command_len]);
             vga.writeString("> ");
+            command_len = 0;
+        },
+        else => {
+            if (command_len == 10)
+                return;
+            vga.writeChar(char);
+            command[command_len] = char;
+            command_len += 1;
+        },
+    }
 }
 
 pub fn initialize() void {

src/main.zig

@@ -1,6 +1,7 @@
 use @import("multiboot.zig");
-const console = @import("console.zig");
+const pci = @import("pci.zig");
 const arch = @import("arch/x86/lib/index.zig");
+const console = @import("console.zig");
 
 // platform independant initialization
 pub fn kmain() noreturn {

src/pci.zig

@@ -0,0 +1,97 @@
+const arch = @import("arch/x86/lib/index.zig");
+
+const PCI_CONFIG_ADDRESS = 0xCF8;
+const PCI_CONFIG_DATA = 0xCFC;
+const vga = @import("vga.zig");
+
+pub const PciAddress = packed struct {
+    offset: u8,
+    function: u3,
+    slot: u5,
+    bus: u8,
+    reserved: u7,
+    enable: u1,
+};
+
+pub const PciDevice = struct {
+    bus: u8,
+    slot: u5,
+    function: u3,
+    device: u16,
+    vendor: u16,
+    class: u8,
+    subclass: u8,
+    header_type: u8,
+
+    pub fn init(bus: u8, slot: u5, function: u3) ?PciDevice {
+        var pcidevice = PciDevice{
+            .bus = bus,
+            .slot = slot,
+            .function = function,
+            .device = undefined,
+            .class = undefined,
+            .subclass = undefined,
+            .header_type = undefined,
+            .vendor = undefined,
+        };
+        pcidevice.vendor = pci_config_read_word(pcidevice, 0);
+        if (pcidevice.vendor == 0xffff)
+            return null;
+        pcidevice.device = pci_config_read_word(pcidevice, 2);
+        pcidevice.subclass = pci_config_read_byte(pcidevice, 10);
+        pcidevice.class = pci_config_read_byte(pcidevice, 11);
+        pcidevice.header_type = pci_config_read_byte(pcidevice, 14);
+        return (pcidevice);
+    }
+
+    pub fn address(self: PciDevice, offset: u8) u32 {
+        var addr = PciAddress{
+            .enable = 1,
+            .reserved = 0,
+            .bus = self.bus,
+            .slot = self.slot,
+            .function = self.function,
+            .offset = offset,
+        };
+        return (@bitCast(u32, addr));
+    }
+
+    pub fn format(self: PciDevice) void {
+        vga.printf("{}:{}.{} {x},{x}: {x} {x}\n", self.bus, self.slot, self.function, self.class, self.subclass, self.vendor, self.device);
+    }
+
+    pub fn access(self: PciDevice, offset: u8) void {
+        arch.outl(PCI_CONFIG_ADDRESS, self.address(offset));
+    }
+
+    pub fn pci_config_read_byte(self: PciDevice, offset: u8) u8 {
+        self.access(offset);
+        return (arch.inb(PCI_CONFIG_DATA));
+    }
+
+    pub fn pci_config_read_word(self: PciDevice, offset: u8) u16 {
+        self.access(offset);
+        return (arch.inw(PCI_CONFIG_DATA));
+    }
+
+    pub fn pci_config_read_long(self: PciDevice, offset: u8) u32 {
+        self.access(offset);
+        return (arch.inl(PCI_CONFIG_DATA));
+    }
+};
+
+pub fn lspci() void {
+    var slot: u5 = 0;
+    while (true) {
+        if (PciDevice.init(0, slot, 0)) |device| {
+            device.format();
+            var function: u3 = 0;
+            while (true) {
+                if (PciDevice.init(0, slot, function)) |vf|
+                    vf.format();
+                if (function == 7) break else function += 1;
+            }
+        }
+        if (slot == 31) break else slot += 1;
+    }
+}

src/vga.zig

@@ -1,6 +1,7 @@
 const builtin = @import("builtin");
 const mem = @import("std").mem;
 const arch = @import("arch/x86/lib/index.zig");
+const std = @import("std");
 
 // VRAM buffer address in physical memory.
 pub const VRAM_ADDR = 0xB8000;
@@ -9,6 +10,7 @@ pub const VRAM_SIZE = 0x8000;
 pub const VGA_WIDTH = 80;
 pub const VGA_HEIGHT = 25;
 pub const VGA_SIZE = VGA_WIDTH * VGA_HEIGHT;
+pub var vga = VGA.init(VRAM_ADDR);
 
 // Color codes.
 pub const Color = enum(u4) {
@@ -53,6 +55,15 @@ pub fn disableCursor() void {
     outb(0x3D5, 1 << 5);
 }
 
+const Errors = error{};
+pub fn printf(comptime format: []const u8, args: ...) void {
+    var a = std.fmt.format({}, Errors, printCallback, format, args);
+}
+
+fn printCallback(context: void, string: []const u8) Errors!void {
+    vga.writeString(string);
+}
+
 // VGA status.
 pub const VGA = struct {
     vram: []VGAEntry,
@@ -116,8 +127,9 @@ pub const VGA = struct {
             // FIXME: hardcoded 8 here is horrible.
             8 => {
                 self.cursor -= 1;
-                self.writeChar(' ');
-                self.cursor -= 1;
+                // self.writeChar(' ');
+                self.vram[self.cursor] = self.entry(' ');
+                // self.cursor -= 1;
             },
             // Any other character.
             else => {
@@ -125,6 +137,7 @@ pub const VGA = struct {
                 self.cursor += 1;
             },
         }
+        self.updateCursor();
     }
 
     ////
@@ -161,7 +174,7 @@ pub const VGA = struct {
     // Update the position of the hardware cursor.
     // Use the software cursor as the source of truth.
     //
-    fn updateCursor(self: *const VGA) void {
+    pub fn updateCursor(self: *const VGA) void {
         arch.outb(0x3D4, 0x0F);
         arch.outb(0x3D5, @truncate(u8, self.cursor));
         arch.outb(0x3D4, 0x0E);