- Created src/dhcp.h: DHCP packet struct, lease info struct, message types,
options codes, client states, discover/receive/get_lease API
- Created src/dhcp.c: DHCP client with DISCOVER/OFFER/REQUEST/ACK flow,
manual IP+UDP header construction for broadcast, option parsing for
subnet mask/router/DNS/lease time/server ID, lease table, auto-applies
configuration to ethernet interface on ACK, sysfs /sys/dhcp/status
- Created apps/dhcp/dhcp.c: reads /sys/dhcp/status to display DHCP info
- Kernel calls dhcp_init() at boot
- Tested: clean boot, DHCP initialized, dhcp app in CPIO
- Created src/ethernet.h: eth_iface_t interface struct, Ethernet header
type, htons/ntohs/htonl/ntohl byte-order helpers, EtherType constants,
send/recv with automatic header construction/stripping
- Created src/ethernet.c: interface table, char device ops routed
through ethernet layer, sysfs /sys/net namespace exposing per-iface
mac/ip/netmask/gateway/link files, IPv4 address parse/format
- NE2000 and 3C509B drivers now register through ethernet_register()
instead of directly via devicefs_register_char(); removed redundant
char device ops from both drivers
- Kernel calls ethernet_init() before init_drivers() so the subsystem
is ready when NIC drivers probe
- Tested: NE2000 detected with NIC, 'eth1' registered via ethernet
subsystem; clean boot without NIC
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'.
Create a user-space utility that formats block devices with FAT32.
Writes all required on-disk structures sequentially:
- Boot sector (BPB) with BIOS Parameter Block at sector 0
- FSInfo sector at sector 1 with free cluster count/hint
- Backup boot sector at sector 6, backup FSInfo at sector 7
- Two FAT tables with entries 0-2 initialized (media marker,
EOC markers, root directory cluster EOC)
- Root directory cluster with volume label entry
Geometry calculation:
- Sectors per cluster chosen based on volume size (1-32)
- FAT size computed using Microsoft's formula
- Supports volumes from 128 sectors (~64K) upward
Usage: mkfs.fat32 hdd1mbr1 14336 [LABEL]
The total sector count is required since there is no stat() syscall
yet. Users can find it via 'diskpart <dev> list'.
Also checked off diskpart in README (committed previously).
Create a user-space diskpart utility that can view and modify MBR
partition tables on block devices accessible through /dev.
Features:
- list: displays all 4 partition slots with type, LBA start, size
- create <slot> <type> <start> <sectors>: creates a new partition
- delete <slot>: removes a partition entry
- activate/deactivate <slot>: sets or clears the bootable flag
The tool reads sector 0 (MBR) via VFS open/read, modifies the
partition table in memory, then writes it back via open/write.
Supports hex type codes and provides human-readable type names
for common partition types (FAT12/16/32, Linux, NTFS, etc.).
Usage: diskpart hdd1 create 1 0C 2048 14336
diskpart hdd1 list
diskpart hdd1 delete 2
Add Intel 82077AA-compatible floppy disk controller driver with:
- CMOS-based drive detection (register 0x10)
- FDC reset with DOR toggle and SPECIFY command
- Motor control with spin-up delay
- ISA DMA channel 2 setup for data transfers
- LBA-to-CHS conversion for 1.44MB geometry
- Single-sector read/write via DMA with 7-byte result phase
- Seek and recalibrate with sense interrupt verification
- IRQ 6 handler (vector 38) for command completion
- Devicefs integration as 'floppy' class block devices
The IRQ wait function detects whether interrupts are enabled
(EFLAGS IF bit) and temporarily enables them if needed, allowing
the driver to work during early init before the kernel calls STI.
The scheduler safely handles timer interrupts in this window since
no user processes exist yet.
Tested with QEMU: drive detected as 1.44M 3.5", registered as
/dev/floppy1, full boot succeeds with CD+HDD+floppy attached.
