nexoniarz/SchOS
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Initial commit: Schunix as it stands before the SchOS rename

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An x86-64 operating system built from xv6, now largely rewritten: SMP,
a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF
rasteriser, and a Linux-numbered syscall ABI.

No history before this point -- the tree was never under version control.
This commit exists so the rename that follows has something to undo to.
This commit is contained in:
Nexoniarz 2026-08-09 13:47:01 +02:00
commit d0f7acf9eb
275 changed files with 51417 additions and 0 deletions
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69
include/traps.h Normal file
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#pragma once
// x86 trap and interrupt constants.
// Processor-defined exceptions:
#define T_DIVIDE 0 // divide error
#define T_DEBUG 1 // debug exception
#define T_NMI 2 // non-maskable interrupt
#define T_BRKPT 3 // breakpoint
#define T_OFLOW 4 // overflow
#define T_BOUND 5 // bounds check
#define T_ILLOP 6 // illegal opcode
#define T_DEVICE 7 // device not available
#define T_DBLFLT 8 // double fault
#define T_TSS 10 // invalid task switch segment
#define T_SEGNP 11 // segment not present
#define T_STACK 12 // stack exception
#define T_GPFLT 13 // general protection fault
#define T_PGFLT 14 // page fault
#define T_FPERR 16 // floating point error
#define T_ALIGN 17 // aligment check
#define T_MCHK 18 // machine check
#define T_SIMDERR 19 // SIMD floating point error
// IRQ offsets
#define T_IRQ0 32 // IRQ 0 corresponds to int T_IRQ
#define IRQ_TIMER 0
#define IRQ_KBD 1
#define IRQ_COM1 4
#define IRQ_MOUSE 12
#define IRQ_IDE 14
#define IRQ_ERROR 19
#define IRQ_SPURIOUS 31
// System call interrupt number for legacy int 0x40 or 0x80 if used
// although syscall/sysret is preferred for x64
#define T_SYSCALL 0x40
#ifndef __ASSEMBLER__
struct trapframe {
// Registers saved by trapasm.S
uint64 rax;
uint64 rbx;
uint64 rcx;
uint64 rdx;
uint64 rbp;
uint64 rsi;
uint64 rdi;
uint64 r8;
uint64 r9;
uint64 r10;
uint64 r11;
uint64 r12;
uint64 r13;
uint64 r14;
uint64 r15;
uint64 trapno;
// Error code and info saved by hardware
uint64 err;
uint64 rip;
uint64 cs;
uint64 rflags;
uint64 rsp;
uint64 ss;
};
#endif