xtrix design

syscalls

triggered with int (10h + syscall number)
sysv: rdi is sysno; rsi, rdx, rcx is args; rax is return
minimal syscall set:
- (00) sys_dbglog(len, str*)
- (01) sys_mmap(addr, len)
- (02) sys_phymap(phy, virt, len)
  - phymaps are discarded on fork
- (13) sys_phyread(phy, virt, len)
  - special value 0x6b7a0db87ad4d3c1 specifies to read the stivale2 structure.
- IPC stuff
  - (03) sys_open_pipe(side: 0=client 1=server, chan) -> xid
  - (04) sys_close(xid)
  - (05) sys_send_region(xid, addr, len)
  - (06) sys_recv_region(xid, addr, len) -> 0=success 1=fail
  - (07) sys_send_data(xid, dataptr, len)
  - (08) sys_send_vectored(xid, dataptr*, len*, rcount)
  - (09) sys_recv_data(xid, dataptr, len)
  - (0c) sys_clean_exit()
- FastIPC
  - (0d) sys_sendmsg(pid, rid, len, data)
  - (0e) sys_recvmsg(*msg, *arena, maxlen)
    - struct message:
      - ulong spid
      - ulong rid
      - ulong len
- Process stuff
  - (17) sys_getpid() -> pid
  - (0f) sys_getuid() -> uid
  - (10) sys_fork() -> 0=child cpid=parent
  - (11) sys_exec(elfptr, elfsz, argc, argv)
  - (12) sys_setuid(sub-uid)
  - (14) sys_exit(code)
  - (15) sys_wait(pid) -> pid, resulting code
  - (16) sys_waitfor(pid) -> resulting code
- IO port shit
  - (0a) sys_inb(port) -> byte
  - (0b) sys_outb(port, byte)

free syscall numbers: 0d