PCI driver WIP

drivers/pcid/src/pci/bar.rs

@@ -0,0 +1,18 @@
+#[derive(Debug)]
+pub enum PciBar {
+    None,
+    Memory(u32),
+    Port(u16)
+}
+
+impl From<u32> for PciBar {
+    fn from(bar: u32) -> Self {
+        if bar & 0xFFFFFFFC == 0 {
+            PciBar::None
+        } else if bar & 1 == 0 {
+            PciBar::Memory(bar & 0xFFFFFFF0)
+        } else {
+            PciBar::Port((bar & 0xFFFC) as u16)
+        }
+    }
+}

drivers/pcid/src/pci/bus.rs

@@ -0,0 +1,46 @@
+use super::{Pci, PciDev};
+
+pub struct PciBus<'pci> {
+    pub pci: &'pci Pci,
+    pub num: u8
+}
+
+impl<'pci> PciBus<'pci> {
+    pub fn devs(&'pci self) -> PciBusIter<'pci> {
+        PciBusIter::new(self)
+    }
+
+    pub unsafe fn read(&self, dev: u8, func: u8, offset: u8) -> u32 {
+        self.pci.read(self.num, dev, func, offset)
+    }
+}
+
+pub struct PciBusIter<'pci> {
+    bus: &'pci PciBus<'pci>,
+    num: u32
+}
+
+impl<'pci> PciBusIter<'pci> {
+    pub fn new(bus: &'pci PciBus<'pci>) -> Self {
+        PciBusIter {
+            bus: bus,
+            num: 0
+        }
+    }
+}
+
+impl<'pci> Iterator for PciBusIter<'pci> {
+    type Item = PciDev<'pci>;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.num < 32 {
+            let dev = PciDev {
+                bus: self.bus,
+                num: self.num as u8
+            };
+            self.num += 1;
+            Some(dev)
+        } else {
+            None
+        }
+    }
+}

drivers/pcid/src/pci/class.rs

@@ -0,0 +1,50 @@
+#[derive(Debug)]
+pub enum PciClass {
+    Legacy,
+    Storage,
+    Network,
+    Display,
+    Multimedia,
+    Memory,
+    Bridge,
+    SimpleComms,
+    Peripheral,
+    Input,
+    Docking,
+    Processor,
+    SerialBus,
+    Wireless,
+    IntelligentIo,
+    SatelliteComms,
+    Cryptography,
+    SignalProc,
+    Reserved(u8),
+    Unknown
+}
+
+impl From<u8> for PciClass {
+    fn from(class: u8) -> PciClass {
+        match class {
+            0x00 => PciClass::Legacy,
+            0x01 => PciClass::Storage,
+            0x02 => PciClass::Network,
+            0x03 => PciClass::Display,
+            0x04 => PciClass::Multimedia,
+            0x05 => PciClass::Memory,
+            0x06 => PciClass::Bridge,
+            0x07 => PciClass::SimpleComms,
+            0x08 => PciClass::Peripheral,
+            0x09 => PciClass::Input,
+            0x0A => PciClass::Docking,
+            0x0B => PciClass::Processor,
+            0x0C => PciClass::SerialBus,
+            0x0D => PciClass::Wireless,
+            0x0E => PciClass::IntelligentIo,
+            0x0F => PciClass::SatelliteComms,
+            0x10 => PciClass::Cryptography,
+            0x11 => PciClass::SignalProc,
+            0xFF => PciClass::Unknown,
+            reserved => PciClass::Reserved(reserved)
+        }
+    }
+}

drivers/pcid/src/pci/dev.rs

@@ -0,0 +1,46 @@
+use super::{PciBus, PciFunc};
+
+pub struct PciDev<'pci> {
+    pub bus: &'pci PciBus<'pci>,
+    pub num: u8
+}
+
+impl<'pci> PciDev<'pci> {
+    pub fn funcs(&'pci self) -> PciDevIter<'pci> {
+        PciDevIter::new(self)
+    }
+
+    pub unsafe fn read(&self, func: u8, offset: u8) -> u32 {
+        self.bus.read(self.num, func, offset)
+    }
+}
+
+pub struct PciDevIter<'pci> {
+    dev: &'pci PciDev<'pci>,
+    num: u32
+}
+
+impl<'pci> PciDevIter<'pci> {
+    pub fn new(dev: &'pci PciDev<'pci>) -> Self {
+        PciDevIter {
+            dev: dev,
+            num: 0
+        }
+    }
+}
+
+impl<'pci> Iterator for PciDevIter<'pci> {
+    type Item = PciFunc<'pci>;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.num < 8 {
+            let func = PciFunc {
+                dev: self.dev,
+                num: self.num as u8
+            };
+            self.num += 1;
+            Some(func)
+        } else {
+            None
+        }
+    }
+}

drivers/pcid/src/pci/func.rs

@@ -0,0 +1,30 @@
+use std::ops::DerefMut;
+
+use super::{PciDev, PciHeader};
+
+pub struct PciFunc<'pci> {
+    pub dev: &'pci PciDev<'pci>,
+    pub num: u8
+}
+
+impl<'pci> PciFunc<'pci> {
+    pub fn header(&self) -> Option<PciHeader> {
+        if unsafe { self.read(0) } != 0xFFFFFFFF {
+            let mut header = PciHeader::default();
+            {
+                let dwords = header.deref_mut();
+                dwords.iter_mut().fold(0usize, |offset, dword| {
+                    *dword = unsafe { self.read(offset as u8) };
+                    offset + 4
+                });
+            }
+            Some(header)
+        } else {
+            None
+        }
+    }
+
+    pub unsafe fn read(&self, offset: u8) -> u32 {
+        self.dev.read(self.num, offset)
+    }
+}

drivers/pcid/src/pci/header.rs

@@ -0,0 +1,43 @@
+use std::ops::{Deref, DerefMut};
+use std::{slice, mem};
+
+#[derive(Debug, Default)]
+#[repr(packed)]
+pub struct PciHeader {
+    pub vendor_id: u16,
+    pub device_id: u16,
+    pub command: u16,
+    pub status: u16,
+    pub revision: u8,
+    pub interface: u8,
+    pub subclass: u8,
+    pub class: u8,
+    pub cache_line_size: u8,
+    pub latency_timer: u8,
+    pub header_type: u8,
+    pub bist: u8,
+    pub bars: [u32; 6],
+    pub cardbus_cis_ptr: u32,
+    pub subsystem_vendor_id: u16,
+    pub subsystem_id: u16,
+    pub expansion_rom_bar: u32,
+    pub capabilities: u8,
+    pub reserved: [u8; 7],
+    pub interrupt_line: u8,
+    pub interrupt_pin: u8,
+    pub min_grant: u8,
+    pub max_latency: u8
+}
+
+impl Deref for PciHeader {
+    type Target = [u32];
+    fn deref(&self) -> &[u32] {
+        unsafe { slice::from_raw_parts(self as *const PciHeader as *const u32, mem::size_of::<PciHeader>()/4) as &[u32] }
+    }
+}
+
+impl DerefMut for PciHeader {
+    fn deref_mut(&mut self) -> &mut [u32] {
+        unsafe { slice::from_raw_parts_mut(self as *mut PciHeader as *mut u32, mem::size_of::<PciHeader>()/4) as &mut [u32] }
+    }
+}

drivers/pcid/src/pci/mod.rs

@@ -0,0 +1,67 @@
+pub use self::bar::PciBar;
+pub use self::bus::{PciBus, PciBusIter};
+pub use self::class::PciClass;
+pub use self::dev::{PciDev, PciDevIter};
+pub use self::func::PciFunc;
+pub use self::header::PciHeader;
+
+mod bar;
+mod bus;
+mod class;
+mod dev;
+mod func;
+mod header;
+
+pub struct Pci;
+
+impl Pci {
+    pub fn new() -> Self {
+        Pci
+    }
+
+    pub fn buses<'pci>(&'pci self) -> PciIter<'pci> {
+        PciIter::new(self)
+    }
+
+    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    pub unsafe fn read(&self, bus: u8, dev: u8, func: u8, offset: u8) -> u32 {
+        let address = 0x80000000 | ((bus as u32) << 16) | ((dev as u32) << 11) | ((func as u32) << 8) | ((offset as u32) & 0xFC);
+        let value: u32;
+        asm!("mov dx, 0xCF8
+            out dx, eax
+            mov dx, 0xCFC
+            in eax, dx"
+            : "={eax}"(value) : "{eax}"(address) : "dx" : "intel", "volatile");
+        value
+    }
+}
+
+pub struct PciIter<'pci> {
+    pci: &'pci Pci,
+    num: u32
+}
+
+impl<'pci> PciIter<'pci> {
+    pub fn new(pci: &'pci Pci) -> Self {
+        PciIter {
+            pci: pci,
+            num: 0
+        }
+    }
+}
+
+impl<'pci> Iterator for PciIter<'pci> {
+    type Item = PciBus<'pci>;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.num < 256 {
+            let bus = PciBus {
+                pci: self.pci,
+                num: self.num as u8
+            };
+            self.num += 1;
+            Some(bus)
+        } else {
+            None
+        }
+    }
+}