bac6068857
- current and maximum priority per process; - quantum size and current ticks left per process; - max number of full quantums in a row allow (otherwise current priority is decremented)
210 lines
6.5 KiB
C
210 lines
6.5 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_FORK
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (child's process table slot)
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* m1_i2: PR_PPROC_NR (parent, process that forked)
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* m1_i3: PR_PID (child pid received from PM)
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*/
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#include "../kernel.h"
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#include "../system.h"
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#include "../sendmask.h"
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#include <signal.h>
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#if (CHIP == INTEL)
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#include "../protect.h"
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#endif
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#include "../debug.h"
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/*===========================================================================*
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* do_fork *
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*===========================================================================*/
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PUBLIC int do_fork(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_fork(). PR_PPROC_NR has forked. The child is PR_PROC_NR. */
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#if (CHIP == INTEL)
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reg_t old_ldt_sel;
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#endif
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register struct proc *rpc;
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struct proc *rpp;
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rpp = proc_addr(m_ptr->PR_PPROC_NR);
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rpc = proc_addr(m_ptr->PR_PROC_NR);
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if (! isemptyp(rpc)) return(EINVAL);
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/* Copy parent 'proc' struct to child. */
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#if (CHIP == INTEL)
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old_ldt_sel = rpc->p_ldt_sel; /* stop this being obliterated by copy */
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#endif
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*rpc = *rpp; /* copy 'proc' struct */
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#if (CHIP == INTEL)
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rpc->p_ldt_sel = old_ldt_sel;
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#endif
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rpc->p_nr = m_ptr->PR_PROC_NR; /* this was obliterated by copy */
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rpc->p_ntf_q = NULL; /* remove pending notifications */
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/* Only one in group should have SIGNALED, child doesn't inherit tracing. */
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rpc->p_rts_flags |= NO_MAP; /* inhibit process from running */
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rpc->p_rts_flags &= ~(SIGNALED | SIG_PENDING | P_STOP);
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sigemptyset(&rpc->p_pending);
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rpc->p_reg.retreg = 0; /* child sees pid = 0 to know it is child */
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rpc->p_user_time = 0; /* set all the accounting times to 0 */
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rpc->p_sys_time = 0;
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return(OK);
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}
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/* The system call implemented in this file:
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* m_type: SYS_NEWMAP
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (install new map for this process)
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* m1_p1: PR_MEM_PTR (pointer to memory map)
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*/
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/*===========================================================================*
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* do_newmap *
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*===========================================================================*/
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PUBLIC int do_newmap(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_newmap(). Fetch the memory map from PM. */
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register struct proc *rp;
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phys_bytes src_phys;
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int caller; /* whose space has the new map (usually PM) */
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int k; /* process whose map is to be loaded */
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int old_flags; /* value of flags before modification */
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struct mem_map *map_ptr; /* virtual address of map inside caller (PM) */
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/* Extract message parameters and copy new memory map from PM. */
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caller = m_ptr->m_source;
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k = m_ptr->PR_PROC_NR;
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map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
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if (!isokprocn(k)) return(EINVAL);
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rp = proc_addr(k); /* ptr to entry of user getting new map */
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/* Copy the map from PM. */
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src_phys = umap_local(proc_addr(caller), D, (vir_bytes) map_ptr,
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sizeof(rp->p_memmap));
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if (src_phys == 0) return(EFAULT);
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phys_copy(src_phys,vir2phys(rp->p_memmap),(phys_bytes)sizeof(rp->p_memmap));
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#if (CHIP != M68000)
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alloc_segments(rp);
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#else
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pmmu_init_proc(rp);
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#endif
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old_flags = rp->p_rts_flags; /* save the previous value of the flags */
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rp->p_rts_flags &= ~NO_MAP;
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if (old_flags != 0 && rp->p_rts_flags == 0) lock_ready(rp);
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return(OK);
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}
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/* The system call implemented in this file:
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* m_type: SYS_EXEC
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (process that did exec call)
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* m1_i3: PR_TRACING (flag to indicate tracing is on/ off)
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* m1_p1: PR_STACK_PTR (new stack pointer)
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* m1_p2: PR_NAME_PTR (pointer to program name)
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* m1_p3: PR_IP_PTR (new instruction pointer)
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*/
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/*===========================================================================*
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* do_exec *
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*===========================================================================*/
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PUBLIC int do_exec(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
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register struct proc *rp;
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reg_t sp; /* new sp */
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phys_bytes phys_name;
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char *np;
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rp = proc_addr(m_ptr->PR_PROC_NR);
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if (m_ptr->PR_TRACING) cause_sig(m_ptr->PR_PROC_NR, SIGTRAP);
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sp = (reg_t) m_ptr->PR_STACK_PTR;
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rp->p_reg.sp = sp; /* set the stack pointer */
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#if (CHIP == M68000)
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rp->p_splow = sp; /* set the stack pointer low water */
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#ifdef FPP
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/* Initialize fpp for this process */
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fpp_new_state(rp);
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#endif
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#endif
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#if (CHIP == INTEL) /* wipe extra LDT entries */
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kmemset(&rp->p_ldt[EXTRA_LDT_INDEX], 0,
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(LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_ldt[0]));
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#endif
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rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR; /* set pc */
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rp->p_rts_flags &= ~RECEIVING; /* PM does not reply to EXEC call */
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if (rp->p_rts_flags == 0) lock_ready(rp);
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/* Save command name for debugging, ps(1) output, etc. */
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phys_name = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->PR_NAME_PTR,
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(vir_bytes) P_NAME_LEN - 1);
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if (phys_name != 0) {
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phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) P_NAME_LEN - 1);
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for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
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*np = 0; /* mark end */
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} else {
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kstrncpy(rp->p_name, "<unset>", P_NAME_LEN);
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}
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return(OK);
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}
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/* The system call implemented in this file:
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* m_type: SYS_XIT
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (slot number of exiting process)
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*/
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/*===========================================================================*
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* do_xit *
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*===========================================================================*/
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PUBLIC int do_xit(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_exit. A user process has exited or a system process requests
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* to exit. Only the PM can request other process slots to be cleared.
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* The routine to clean up a process table slot cancels outstanding timers,
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* possibly removes the process from the message queues, and resets certain
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* process table fields to the default values.
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*/
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int exit_proc_nr;
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/* Determine what process exited. */
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if (PM_PROC_NR == m_ptr->m_source) {
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exit_proc_nr = m_ptr->PR_PROC_NR; /* get exiting process */
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if (exit_proc_nr != SELF) { /* PM tries to exit self */
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if (! isokprocn(exit_proc_nr)) return(EINVAL);
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clear_proc(exit_proc_nr); /* exit a user process */
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return(OK); /* report back to PM */
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}
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}
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/* The PM or some other system process requested to be exited. */
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clear_proc(m_ptr->m_source);
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return(EDONTREPLY);
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}
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