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Implement NE2000 ISA Ethernet NIC driver (AI)

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Add a driver for NE2000-compatible ISA Ethernet cards based on the
DP8390 controller. Features:

- PROM-based MAC address detection and validation
- Programmed I/O (PIO) remote DMA for data transfers
- Ring buffer management for RX with wrap-around handling
- IRQ 9-driven packet reception and transmission
- Synchronous TX with timeout
- Character device registration as 'eth' class (/dev/ethN)

Probe verifies card presence by resetting the controller, configuring
it for PROM reading, and checking the MAC is not all-0xFF/all-0x00
(which would indicate no hardware at the I/O base).

NE2000 memory layout (16 KiB on-card RAM):
- Pages 0x40-0x45: TX buffer (1536 bytes, 1 MTU frame)
- Pages 0x46-0x7F: RX ring buffer (~14.5 KiB)

Tested with QEMU: `-device ne2k_isa,iobase=0x300,irq=9` correctly
detects the card and registers /dev/eth1. Without the NIC option,
probe correctly reports 'not found'.
This commit is contained in:
AI
2026-02-23 17:34:12 +00:00
parent 27b2042523
commit f87a4e3101
6 changed files with 819 additions and 5 deletions
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make: Warning: File 'Makefile' has modification time 48547 s in the future
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make[2]: Warning: File 'CMakeFiles/apps.dir/progress.make' has modification time 48547 s in the future
[ 3%] Building user-mode applications
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Built: /workspaces/claude-os/build/apps_bin/cat (310 bytes)
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1 warning generated.
Built: /workspaces/claude-os/build/apps_bin/sh (3428 bytes)
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xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.
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Media current: stdio file, overwriteable
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Added to ISO image: directory '/'='/tmp/grub.bEiDnH'
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xorriso : UPDATE : 581 files added in 1 seconds
Added to ISO image: directory '/'='/workspaces/claude-os/build/isodir'
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xorriso : NOTE : Copying to System Area: 512 bytes from file '/usr/lib/grub/i386-pc/boot_hybrid.img'
xorriso : UPDATE : Thank you for being patient. Working since 0 seconds.
ISO image produced: 5924 sectors
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