104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_VMCTL
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*
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* The parameters for this kernel call are:
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* SVMCTL_WHO which process
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* SVMCTL_PARAM set this setting (VMCTL_*)
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* SVMCTL_VALUE to this value
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*/
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#include "../system.h"
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#include "../vm.h"
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#include "../debug.h"
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#include <minix/type.h>
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#include <minix/config.h>
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/*===========================================================================*
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* do_vmctl *
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*===========================================================================*/
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PUBLIC int do_vmctl(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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int proc_nr, i;
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endpoint_t ep = m_ptr->SVMCTL_WHO;
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struct proc *p, *rp;
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if(ep == SELF) { ep = m_ptr->m_source; }
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vm_init();
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if(!isokendpt(ep, &proc_nr)) {
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kprintf("do_vmctl: unexpected endpoint %d from VM\n", ep);
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return EINVAL;
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}
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p = proc_addr(proc_nr);
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switch(m_ptr->SVMCTL_PARAM) {
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case VMCTL_CLEAR_PAGEFAULT:
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RTS_LOCK_UNSET(p, PAGEFAULT);
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return OK;
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case VMCTL_MEMREQ_GET:
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/* Send VM the information about the memory request. */
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if(!(rp = vmrequest))
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return ESRCH;
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if(!RTS_ISSET(rp, VMREQUEST))
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minix_panic("do_vmctl: no VMREQUEST set", NO_NUM);
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/* Reply with request fields. */
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m_ptr->SVMCTL_MRG_ADDR = (char *) rp->p_vmrequest.start;
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m_ptr->SVMCTL_MRG_LEN = rp->p_vmrequest.length;
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m_ptr->SVMCTL_MRG_WRITE = rp->p_vmrequest.writeflag;
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m_ptr->SVMCTL_MRG_EP = rp->p_vmrequest.who;
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rp->p_vmrequest.vmresult = VMSUSPEND;
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/* Remove from request chain. */
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vmrequest = vmrequest->p_vmrequest.nextrequestor;
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return OK;
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case VMCTL_MEMREQ_REPLY:
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if(!(rp = p->p_vmrequest.requestor))
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minix_panic("do_vmctl: no requestor set", ep);
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p->p_vmrequest.requestor = NULL;
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if(!RTS_ISSET(rp, VMREQUEST))
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minix_panic("do_vmctl: no VMREQUEST set", ep);
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if(rp->p_vmrequest.vmresult != VMSUSPEND)
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minix_panic("do_vmctl: result not VMSUSPEND set",
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rp->p_vmrequest.vmresult);
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rp->p_vmrequest.vmresult = m_ptr->SVMCTL_VALUE;
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if(rp->p_vmrequest.vmresult == VMSUSPEND)
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minix_panic("VM returned VMSUSPEND?", NO_NUM);
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if(rp->p_vmrequest.vmresult != OK)
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kprintf("SYSTEM: VM replied %d to mem request\n",
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rp->p_vmrequest.vmresult);
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/* Put on restart chain. */
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rp->p_vmrequest.nextrestart = vmrestart;
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vmrestart = rp;
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#if DEBUG_VMASSERT
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/* Sanity check. */
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if(rp->p_vmrequest.vmresult == OK) {
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if(CHECKRANGE(p,
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rp->p_vmrequest.start,
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rp->p_vmrequest.length,
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rp->p_vmrequest.writeflag) != OK) {
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kprintf("SYSTEM: request %d:0x%lx-0x%lx, wrflag %d, failed\n",
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rp->p_endpoint,
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rp->p_vmrequest.start, rp->p_vmrequest.start + rp->p_vmrequest.length,
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rp->p_vmrequest.writeflag);
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minix_panic("SYSTEM: fail but VM said OK", NO_NUM);
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}
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}
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#endif
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return OK;
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#if VM_KERN_NOPAGEZERO
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case VMCTL_NOPAGEZERO:
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return OK;
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#endif
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}
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/* Try architecture-specific vmctls. */
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return arch_do_vmctl(m_ptr, p);
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}
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