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ladybird/Kernel/Net/NE2000NetworkAdapter.cpp
Liav A 25ea7461a0 Kernel/PCI: Simplify the entire subsystem 
A couple of things were changed:
1. Semantic changes - PCI segments are now called PCI domains, to better
match what they are really. It's also the name that Linux gave, and it
seems that Wikipedia also uses this name.
We also remove PCI::ChangeableAddress, because it was used in the past
but now it's no longer being used.
2. There are no WindowedMMIOAccess or MMIOAccess classes anymore, as
they made a bunch of unnecessary complexity. Instead, Windowed access is
removed entirely (this was tested, but never was benchmarked), so we are
left with IO access and memory access options. The memory access option
is essentially mapping the PCI bus (from the chosen PCI domain), to
virtual memory as-is. This means that unless needed, at any time, there
is only one PCI bus being mapped, and this is changed if access to
another PCI bus in the same PCI domain is needed. For now, we don't
support mapping of different PCI buses from different PCI domains at the
same time, because basically it's still a non-issue for most machines
out there.
2. OOM-safety is increased, especially when constructing the Access
object. It means that we pre-allocating any needed resources, and we try
to find PCI domains (if requested to initialize memory access) after we
attempt to construct the Access object, so it's possible to fail at this
point "gracefully".
3. All PCI API functions are now separated into a different header file,
which means only "clients" of the PCI subsystem API will need to include
that header file.
4. Functional changes - we only allow now to enumerate the bus after
a hardware scan. This means that the old method "enumerate_hardware"
is removed, so, when initializing an Access object, the initializing
function must call rescan on it to force it to find devices. This makes
it possible to fail rescan, and also to defer it after construction from
both OOM-safety terms and hotplug capabilities.
2021-09-07 13:47:37 +02:00

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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/MACAddress.h>
#include <Kernel/Bus/PCI/API.h>
#include <Kernel/Debug.h>
#include <Kernel/IO.h>
#include <Kernel/Net/NE2000NetworkAdapter.h>
#include <Kernel/Sections.h>
namespace Kernel {
/**
* The NE2000 is an ancient 10 Mib/s Ethernet network card standard by Novell
* from the late 80s. Based on National Semiconductor's DP8390 Ethernet chip
* or compatible, they were known to be extremely bare-bones but also very
* cheap entry-level cards.
*
* QEMU supports them with the ne2k_{isa,pci} devices, physical incarnations
* were available from different manufacturers for the ISA bus and later on
* the PCI bus, including:
* - Realtek's RTL8029
* - VIA Technologies, Inc.'s VT86C926
*
* Official documentation from National Semiconductor includes:
* - Datasheet "DP8390D/NS32490D NIC Network Interface Controller"
* - Application Note 874 "Writing Drivers for the DP8390 NIC Family of Ethernet Controllers"
*
* This driver supports only the PCI variant.
*
* Remember, friends don't let friends use NE2000 network cards :^)
*/
// Page 0 registers
static constexpr u8 REG_RW_COMMAND = 0x00;
static constexpr u8 BIT_COMMAND_STOP = (0b1 << 0);
static constexpr u8 BIT_COMMAND_START = (0b1 << 1);
static constexpr u8 BIT_COMMAND_TXP = (0b1 << 2);
static constexpr u8 BIT_COMMAND_DMA_READ = (0b001 << 3);
static constexpr u8 BIT_COMMAND_DMA_WRITE = (0b010 << 3);
static constexpr u8 BIT_COMMAND_DMA_SEND = (0b011 << 3);
static constexpr u8 BIT_COMMAND_DMA_ABORT = (0b100 << 3);
static constexpr u8 BIT_COMMAND_DMA_FIELD = (0b111 << 3);
static constexpr u8 BIT_COMMAND_PAGE1 = (0b01 << 6);
static constexpr u8 BIT_COMMAND_PAGE2 = (0b10 << 6);
static constexpr u8 BIT_COMMAND_PAGE_FIELD = (0b11 << 6);
static constexpr u8 REG_WR_PAGESTART = 0x01;
static constexpr u8 REG_WR_PAGESTOP = 0x02;
static constexpr u8 REG_RW_BOUNDARY = 0x03;
static constexpr u8 REG_RD_TRANSMITSTATUS = 0x04;
static constexpr u8 REG_WR_TRANSMITPAGE = 0x04;
static constexpr u8 REG_RD_NCR = 0x05;
static constexpr u8 REG_WR_TRANSMITBYTECOUNT0 = 0x05;
static constexpr u8 REG_WR_TRANSMITBYTECOUNT1 = 0x06;
static constexpr u8 REG_RW_INTERRUPTSTATUS = 0x07;
static constexpr u8 REG_RD_CRDMA0 = 0x08;
static constexpr u8 REG_WR_REMOTESTARTADDRESS0 = 0x08;
static constexpr u8 REG_RD_CRDMA1 = 0x09;
static constexpr u8 REG_WR_REMOTESTARTADDRESS1 = 0x09;
static constexpr u8 REG_WR_REMOTEBYTECOUNT0 = 0x0a;
static constexpr u8 REG_WR_REMOTEBYTECOUNT1 = 0x0b;
static constexpr u8 REG_RD_RECEIVESTATUS = 0x0c;
static constexpr u8 BIT_RECEIVESTATUS_PRX = (0b1 << 0);
static constexpr u8 BIT_RECEIVESTATUS_CRC = (0b1 << 1);
static constexpr u8 BIT_RECEIVESTATUS_FAE = (0b1 << 2);
static constexpr u8 BIT_RECEIVESTATUS_FO = (0b1 << 3);
static constexpr u8 BIT_RECEIVESTATUS_MPA = (0b1 << 4);
static constexpr u8 REG_WR_RECEIVECONFIGURATION = 0x0c;
static constexpr u8 BIT_RECEIVECONFIGURATION_SEP = (0b1 << 0);
static constexpr u8 BIT_RECEIVECONFIGURATION_AR = (0b1 << 1);
static constexpr u8 BIT_RECEIVECONFIGURATION_AB = (0b1 << 2);
static constexpr u8 BIT_RECEIVECONFIGURATION_AM = (0b1 << 3);
static constexpr u8 BIT_RECEIVECONFIGURATION_PRO = (0b1 << 4);
static constexpr u8 BIT_RECEIVECONFIGURATION_MON = (0b1 << 5);
static constexpr u8 REG_RD_FAE_TALLY = 0x0d;
static constexpr u8 REG_WR_TRANSMITCONFIGURATION = 0x0d;
static constexpr u8 BIT_WR_TRANSMITCONFIGURATION_LOOPBACK = (0b10 << 0);
static constexpr u8 REG_RD_CRC_TALLY = 0x0e;
static constexpr u8 REG_WR_DATACONFIGURATION = 0x0e;
static constexpr u8 BIT_DATACONFIGURATION_WTS = (0b1 << 0);
static constexpr u8 BIT_DATACONFIGURATION_BOS = (0b1 << 1);
static constexpr u8 BIT_DATACONFIGURATION_LS = (0b1 << 2);
static constexpr u8 BIT_DATACONFIGURATION_FIFO_8B = (0b10 << 5);
static constexpr u8 REG_RD_MISS_PKT_TALLY = 0x0f;
static constexpr u8 REG_WR_INTERRUPTMASK = 0x0f;
static constexpr u8 BIT_INTERRUPTMASK_PRX = (0b1 << 0);
static constexpr u8 BIT_INTERRUPTMASK_PTX = (0b1 << 1);
static constexpr u8 BIT_INTERRUPTMASK_RXE = (0b1 << 2);
static constexpr u8 BIT_INTERRUPTMASK_TXE = (0b1 << 3);
static constexpr u8 BIT_INTERRUPTMASK_OVW = (0b1 << 4);
static constexpr u8 BIT_INTERRUPTMASK_CNT = (0b1 << 5);
static constexpr u8 BIT_INTERRUPTMASK_RDC = (0b1 << 6);
static constexpr u8 BIT_INTERRUPTMASK_RST = (0b1 << 7);
static constexpr u8 REG_RW_IOPORT = 0x10;
// Page 1 registers
static constexpr u8 REG_RW_PHYSICALADDRESS0 = 0x01;
static constexpr u8 REG_RW_CURRENT = 0x07;
static constexpr int NE2K_PAGE_SIZE = 256;
static constexpr int NE2K_RAM_BEGIN = 16384;
static constexpr int NE2K_RAM_END = 32768;
static constexpr int NE2K_RAM_SIZE = NE2K_RAM_END - NE2K_RAM_BEGIN;
static constexpr int NE2K_RAM_SEND_BEGIN = 16384;
static constexpr int NE2K_RAM_SEND_END = 16384 + 6 * NE2K_PAGE_SIZE;
static constexpr int NE2K_RAM_SEND_SIZE = NE2K_RAM_SEND_END - NE2K_RAM_SEND_BEGIN;
static constexpr int NE2K_RAM_RECV_BEGIN = NE2K_RAM_SEND_END;
static constexpr int NE2K_RAM_RECV_END = NE2K_RAM_END;
static constexpr int NE2K_RAM_RECV_SIZE = NE2K_RAM_RECV_END - NE2K_RAM_RECV_BEGIN;
static_assert(NE2K_RAM_BEGIN % NE2K_PAGE_SIZE == 0);
static_assert(NE2K_RAM_END % NE2K_PAGE_SIZE == 0);
static_assert(NE2K_RAM_SEND_BEGIN % NE2K_PAGE_SIZE == 0);
static_assert(NE2K_RAM_SEND_END % NE2K_PAGE_SIZE == 0);
static_assert(NE2K_RAM_RECV_BEGIN % NE2K_PAGE_SIZE == 0);
static_assert(NE2K_RAM_RECV_END % NE2K_PAGE_SIZE == 0);
struct [[gnu::packed]] received_packet_header {
u8 status;
u8 next_packet_page;
u16 length;
};
UNMAP_AFTER_INIT RefPtr<NE2000NetworkAdapter> NE2000NetworkAdapter::try_to_initialize(PCI::Address address)
{
constexpr auto ne2k_ids = Array {
PCI::ID { 0x10EC, 0x8029 }, // RealTek RTL-8029(AS)
// List of clones, taken from Linux's ne2k-pci.c
PCI::ID { 0x1050, 0x0940 }, // Winbond 89C940
PCI::ID { 0x11f6, 0x1401 }, // Compex RL2000
PCI::ID { 0x8e2e, 0x3000 }, // KTI ET32P2
PCI::ID { 0x4a14, 0x5000 }, // NetVin NV5000SC
PCI::ID { 0x1106, 0x0926 }, // Via 86C926
PCI::ID { 0x10bd, 0x0e34 }, // SureCom NE34
PCI::ID { 0x1050, 0x5a5a }, // Winbond W89C940F
PCI::ID { 0x12c3, 0x0058 }, // Holtek HT80232
PCI::ID { 0x12c3, 0x5598 }, // Holtek HT80229
PCI::ID { 0x8c4a, 0x1980 }, // Winbond W89C940 (misprogrammed)
};
auto id = PCI::get_id(address);
if (!ne2k_ids.span().contains_slow(id))
return {};
u8 irq = PCI::get_interrupt_line(address);
return adopt_ref_if_nonnull(new (nothrow) NE2000NetworkAdapter(address, irq));
}
UNMAP_AFTER_INIT NE2000NetworkAdapter::NE2000NetworkAdapter(PCI::Address address, u8 irq)
: PCI::Device(address)
, IRQHandler(irq)
, m_io_base(PCI::get_BAR0(pci_address()) & ~3)
{
set_interface_name(address);
dmesgln("NE2000: Found @ {}", pci_address());
m_interrupt_line = PCI::get_interrupt_line(pci_address());
dmesgln("NE2000: Port base: {}", m_io_base);
dmesgln("NE2000: Interrupt line: {}", m_interrupt_line);
int ram_errors = ram_test();
dmesgln("NE2000: RAM test {}, got {} byte errors", (ram_errors == 0 ? "OK" : "KO"), ram_errors);
reset();
set_mac_address(m_mac_address);
dmesgln("NE2000: MAC address: {}", m_mac_address.to_string().characters());
enable_irq();
}
UNMAP_AFTER_INIT NE2000NetworkAdapter::~NE2000NetworkAdapter()
{
}
bool NE2000NetworkAdapter::handle_irq(const RegisterState&)
{
u8 status = in8(REG_RW_INTERRUPTSTATUS);
m_entropy_source.add_random_event(status);
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Got interrupt, status={:#02x}", status);
if (status == 0) {
return false;
}
if (status & BIT_INTERRUPTMASK_PRX) {
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Interrupt for packet received");
}
if (status & BIT_INTERRUPTMASK_PTX) {
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Interrupt for packet sent");
}
if (status & BIT_INTERRUPTMASK_RXE) {
u8 fae = in8(REG_RD_FAE_TALLY);
u8 crc = in8(REG_RD_CRC_TALLY);
u8 miss = in8(REG_RD_MISS_PKT_TALLY);
dmesgln("NE2000NetworkAdapter: Packet reception error framing={} crc={} missed={}", fae, crc, miss);
// TODO: handle counters
}
if (status & BIT_INTERRUPTMASK_TXE) {
dmesgln("NE2000NetworkAdapter: Packet transmission error");
}
if (status & BIT_INTERRUPTMASK_OVW) {
dmesgln("NE2000NetworkAdapter: Ring buffer reception overflow error");
// TODO: handle counters
}
if (status & BIT_INTERRUPTMASK_CNT) {
dmesgln("NE2000NetworkAdapter: Counter overflow error");
// TODO: handle counters
}
if (status & BIT_INTERRUPTMASK_RST) {
dmesgln("NE2000NetworkAdapter: NIC requires reset due to packet reception overflow");
// TODO: proper reset procedure
reset();
}
receive();
m_wait_queue.wake_all();
out8(REG_RW_INTERRUPTSTATUS, status);
return true;
}
UNMAP_AFTER_INIT int NE2000NetworkAdapter::ram_test()
{
IOAddress io(PCI::get_BAR0(pci_address()) & ~3);
int errors = 0;
out8(REG_RW_COMMAND, BIT_COMMAND_DMA_ABORT | BIT_COMMAND_STOP);
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
out8(REG_WR_DATACONFIGURATION, BIT_DATACONFIGURATION_FIFO_8B | BIT_DATACONFIGURATION_WTS);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
out8(REG_WR_DATACONFIGURATION, BIT_DATACONFIGURATION_FIFO_8B | BIT_DATACONFIGURATION_BOS | BIT_DATACONFIGURATION_WTS);
#else
# error Unknown byte order
#endif
out8(REG_WR_REMOTEBYTECOUNT0, 0x00);
out8(REG_WR_REMOTEBYTECOUNT1, 0x00);
out8(REG_WR_RECEIVECONFIGURATION, BIT_RECEIVECONFIGURATION_MON);
out8(REG_RW_COMMAND, BIT_COMMAND_DMA_ABORT | BIT_COMMAND_START);
Array<u8, NE2K_RAM_SIZE> buffer;
const u8 patterns[3] = { 0x5a, 0xff, 0x00 };
for (int i = 0; i < 3; ++i) {
for (size_t j = 0; j < buffer.size(); ++j)
buffer[j] = patterns[i];
rdma_write(NE2K_RAM_BEGIN, buffer);
rdma_read(NE2K_RAM_BEGIN, buffer);
for (size_t j = 0; j < buffer.size(); ++j) {
if (buffer[j] != patterns[i]) {
if (errors < 16)
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Bad adapter RAM @ {} expected={} got={}", PhysicalAddress(NE2K_RAM_BEGIN + j), patterns[i], buffer[j]);
else if (errors == 16)
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Too many RAM errors, silencing further output");
errors++;
}
}
}
return errors;
}
void NE2000NetworkAdapter::reset()
{
const u8 interrupt_mask = BIT_INTERRUPTMASK_PRX | BIT_INTERRUPTMASK_PTX | BIT_INTERRUPTMASK_RXE | BIT_INTERRUPTMASK_TXE | BIT_INTERRUPTMASK_OVW | BIT_INTERRUPTMASK_CNT;
u8 prom[32];
// Taken from DP8390D's datasheet section 11.0, "Initialization Procedures"
out8(REG_RW_COMMAND, BIT_COMMAND_DMA_ABORT | BIT_COMMAND_STOP);
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
out8(REG_WR_DATACONFIGURATION, BIT_DATACONFIGURATION_FIFO_8B | BIT_DATACONFIGURATION_WTS);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
out8(REG_WR_DATACONFIGURATION, BIT_DATACONFIGURATION_FIFO_8B | BIT_DATACONFIGURATION_BOS | BIT_DATACONFIGURATION_WTS);
#else
# error Unknown byte order
#endif
out8(REG_WR_REMOTEBYTECOUNT0, 0x00);
out8(REG_WR_REMOTEBYTECOUNT1, 0x00);
out8(REG_WR_RECEIVECONFIGURATION, BIT_RECEIVECONFIGURATION_AB | BIT_RECEIVECONFIGURATION_AR);
out8(REG_WR_TRANSMITCONFIGURATION, BIT_WR_TRANSMITCONFIGURATION_LOOPBACK);
m_ring_read_ptr = NE2K_RAM_RECV_BEGIN >> 8;
out8(REG_WR_PAGESTART, NE2K_RAM_RECV_BEGIN >> 8);
out8(REG_RW_BOUNDARY, NE2K_RAM_RECV_BEGIN >> 8);
out8(REG_WR_PAGESTOP, NE2K_RAM_RECV_END >> 8);
out8(REG_RW_INTERRUPTSTATUS, 0xff);
out8(REG_WR_INTERRUPTMASK, interrupt_mask);
rdma_read(0, Bytes(prom, sizeof(prom)));
for (int i = 0; i < 6; i++) {
m_mac_address[i] = prom[i * 2];
}
out8(REG_RW_COMMAND, BIT_COMMAND_PAGE1 | BIT_COMMAND_DMA_ABORT | BIT_COMMAND_STOP);
for (int i = 0; i < 6; i++) {
out8(REG_RW_PHYSICALADDRESS0 + i, m_mac_address[i]);
}
out8(REG_RW_CURRENT, NE2K_RAM_RECV_BEGIN >> 8);
out8(REG_RW_COMMAND, BIT_COMMAND_DMA_ABORT | BIT_COMMAND_START);
out8(REG_WR_TRANSMITCONFIGURATION, 0xe0);
}
void NE2000NetworkAdapter::rdma_read(size_t address, Bytes payload)
{
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: DMA read @ {} length={}", PhysicalAddress(address), payload.size());
u8 command = in8(REG_RW_COMMAND) & ~(BIT_COMMAND_PAGE_FIELD | BIT_COMMAND_DMA_FIELD);
out8(REG_RW_COMMAND, command | BIT_COMMAND_DMA_ABORT);
out8(REG_RW_INTERRUPTSTATUS, BIT_INTERRUPTMASK_RDC);
out8(REG_WR_REMOTEBYTECOUNT0, payload.size());
out8(REG_WR_REMOTEBYTECOUNT1, payload.size() >> 8);
out8(REG_WR_REMOTESTARTADDRESS0, address);
out8(REG_WR_REMOTESTARTADDRESS1, address >> 8);
command = in8(REG_RW_COMMAND) & ~(BIT_COMMAND_DMA_FIELD);
out8(REG_RW_COMMAND, command | BIT_COMMAND_DMA_READ);
for (size_t i = 0; i < payload.size(); i += 2) {
u16 data = in16(REG_RW_IOPORT);
payload[i] = data;
if (i != payload.size() - 1)
payload[i + 1] = data >> 8;
}
while (!(in8(REG_RW_INTERRUPTSTATUS) & BIT_INTERRUPTMASK_RDC))
;
}
void NE2000NetworkAdapter::rdma_write(size_t address, ReadonlyBytes payload)
{
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: DMA write @ {} length={}", PhysicalAddress(address), payload.size());
u8 command = in8(REG_RW_COMMAND) & ~(BIT_COMMAND_PAGE_FIELD | BIT_COMMAND_DMA_FIELD);
out8(REG_RW_COMMAND, command | BIT_COMMAND_DMA_ABORT);
out8(REG_RW_INTERRUPTSTATUS, BIT_INTERRUPTMASK_RDC);
out8(REG_WR_REMOTEBYTECOUNT0, payload.size());
out8(REG_WR_REMOTEBYTECOUNT1, payload.size() >> 8);
out8(REG_WR_REMOTESTARTADDRESS0, address);
out8(REG_WR_REMOTESTARTADDRESS1, address >> 8);
command = in8(REG_RW_COMMAND) & ~(BIT_COMMAND_DMA_FIELD);
out8(REG_RW_COMMAND, command | BIT_COMMAND_DMA_WRITE);
for (size_t i = 0; i < payload.size(); i += 2) {
u16 data = payload[i];
if (i != payload.size() - 1)
data |= payload[i + 1] << 8;
out16(REG_RW_IOPORT, data);
}
while (!(in8(REG_RW_INTERRUPTSTATUS) & BIT_INTERRUPTMASK_RDC))
;
}
void NE2000NetworkAdapter::send_raw(ReadonlyBytes payload)
{
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Sending packet length={}", payload.size());
if (payload.size() > NE2K_RAM_SEND_SIZE) {
dmesgln("NE2000NetworkAdapter: Packet to send was too big; discarding");
return;
}
while (in8(REG_RW_COMMAND) & BIT_COMMAND_TXP)
m_wait_queue.wait_forever("NE2000NetworkAdapter");
disable_irq();
size_t packet_size = payload.size();
if (packet_size < 64)
packet_size = 64;
rdma_write(NE2K_RAM_SEND_BEGIN, payload);
out8(REG_WR_TRANSMITPAGE, NE2K_RAM_SEND_BEGIN >> 8);
out8(REG_WR_TRANSMITBYTECOUNT0, packet_size);
out8(REG_WR_TRANSMITBYTECOUNT1, packet_size >> 8);
out8(REG_RW_COMMAND, BIT_COMMAND_DMA_ABORT | BIT_COMMAND_TXP | BIT_COMMAND_START);
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Packet submitted for transmission");
enable_irq();
}
void NE2000NetworkAdapter::receive()
{
while (true) {
out8(REG_RW_COMMAND, BIT_COMMAND_PAGE1 | in8(REG_RW_COMMAND));
u8 current = in8(REG_RW_CURRENT);
out8(REG_RW_COMMAND, in8(REG_RW_COMMAND) & ~BIT_COMMAND_PAGE_FIELD);
if (m_ring_read_ptr == current)
break;
size_t header_address = m_ring_read_ptr << 8;
received_packet_header header;
rdma_read(header_address, Bytes(reinterpret_cast<u8*>(&header), sizeof(header)));
bool packet_ok = header.status & BIT_RECEIVESTATUS_PRX;
dbgln_if(NE2000_DEBUG, "NE2000NetworkAdapter: Packet received {} length={}", (packet_ok ? "intact" : "damaged"), header.length);
if (packet_ok) {
size_t bytes_in_packet = sizeof(received_packet_header) + header.length;
auto packet_result = NetworkByteBuffer::create_uninitialized(bytes_in_packet);
u8 drop_buffer[NE2K_PAGE_SIZE];
Bytes buffer { drop_buffer, array_size(drop_buffer) };
bool will_drop { false };
if (!packet_result.has_value()) {
dbgln("NE2000NetworkAdapter: Not enough memory for packet with length = {}, dropping.", header.length);
will_drop = true;
} else {
buffer = packet_result->bytes();
}
int current_offset = 0;
int ring_offset = header_address;
while (bytes_in_packet > 0) {
int copy_size = min(bytes_in_packet, NE2K_PAGE_SIZE);
rdma_read(ring_offset, buffer.slice(current_offset, copy_size));
if (!will_drop)
current_offset += copy_size;
ring_offset += copy_size;
bytes_in_packet -= copy_size;
if (ring_offset == NE2K_RAM_RECV_END)
ring_offset = NE2K_RAM_RECV_BEGIN;
}
if (!will_drop)
did_receive(buffer.slice(sizeof(received_packet_header)));
}
if (header.next_packet_page == (NE2K_RAM_RECV_BEGIN >> 8))
out8(REG_RW_BOUNDARY, (NE2K_RAM_RECV_END >> 8) - 1);
else
out8(REG_RW_BOUNDARY, header.next_packet_page - 1);
m_ring_read_ptr = header.next_packet_page;
}
}
void NE2000NetworkAdapter::out8(u16 address, u8 data)
{
m_io_base.offset(address).out(data);
}
void NE2000NetworkAdapter::out16(u16 address, u16 data)
{
m_io_base.offset(address).out(data);
}
u8 NE2000NetworkAdapter::in8(u16 address)
{
u8 data = m_io_base.offset(address).in<u8>();
return data;
}
u16 NE2000NetworkAdapter::in16(u16 address)
{
return m_io_base.offset(address).in<u16>();
}
}
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