35bce963be
- Created src/e3c509.h: full windowed register model (8 windows), command codes, status/interrupt bits, RX filter, transceiver types, device struct and API declarations - Created src/e3c509.c: full driver implementation with PIO TX/RX, window selection, 10base-T (RJ45) transceiver config, MAC address read from Window 2, FIFO-based packet send/receive, IRQ handler, devicefs char device registration as 'eth' class - Probe uses manufacturer ID check (0x6D50 at Window 0) - Only 10base-T supported per design requirements - Wired IRQ 10 (vector 42) handler into isr.c - QEMU does not emulate 3C509 ISA, so driver correctly probes 'not found' in QEMU; tested alongside NE2000 without issues
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
#include "isr.h"
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#include "pic.h"
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#include "process.h"
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#include "syscall.h"
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#include "keyboard.h"
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#include "floppy.h"
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#include "ne2000.h"
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#include "e3c509.h"
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#include <stdint.h>
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/* Forward declaration for kernel panic or similar */
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void offset_print(const char *str);
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void print_hex(uint32_t val);
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/* Exception messages */
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char *exception_messages[] = {
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"Division By Zero",
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"Debug",
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"Non Maskable Interrupt",
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"Breakpoint",
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"Into Detected Overflow",
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"Out of Bounds",
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"Invalid Opcode",
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"No Coprocessor",
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"Double Fault",
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"Coprocessor Segment Overrun",
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"Bad TSS",
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"Segment Not Present",
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"Stack Fault",
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"General Protection Fault",
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"Page Fault",
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"Unknown Interrupt",
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"Coprocessor Fault",
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"Alignment Check",
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"Machine Check",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved"
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};
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void isr_handler(registers_t *regs)
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{
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/* System call (INT 0x80) */
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if (regs->int_no == 0x80) {
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syscall_handler(regs);
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return;
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}
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/* Hardware interrupts (IRQs 0-15, mapped to vectors 32-47) */
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if (regs->int_no >= 32 && regs->int_no < 48) {
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/* Send EOI to PIC (IRQ number 0-15) */
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pic_send_eoi(regs->int_no - 32);
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if (regs->int_no == 32) {
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/* Timer tick - invoke scheduler */
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schedule_tick(regs);
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} else if (regs->int_no == 33) {
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/* Keyboard IRQ */
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keyboard_irq(regs);
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} else if (regs->int_no == 38) {
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/* Floppy IRQ */
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floppy_irq();
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} else if (regs->int_no == 41) {
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/* NE2000 Ethernet IRQ (IRQ 9, vector 41) */
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ne2k_irq();
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} else if (regs->int_no == 42) {
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/* 3C509B Ethernet IRQ (IRQ 10, vector 42) */
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e3c509_irq();
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}
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return;
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}
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/* CPU exceptions (vectors 0-31) */
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offset_print("received interrupt: ");
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print_hex(regs->int_no);
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offset_print("\n");
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if (regs->int_no < 32)
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{
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offset_print(exception_messages[regs->int_no]);
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offset_print(" Exception. System Halted!\n");
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offset_print(" EIP: ");
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print_hex(regs->eip);
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offset_print(" CS: ");
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print_hex(regs->cs);
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offset_print(" ERR: ");
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print_hex(regs->err_code);
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for (;;) ;
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}
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}
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