162 lines
4.6 KiB
C
162 lines
4.6 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, *target;
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int err;
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if(ep == SELF) { ep = m_ptr->m_source; }
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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, RTS_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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vmassert(RTS_ISSET(rp, RTS_VMREQUEST));
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#if 0
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printf("kernel: vm request sent by: %s / %d about %d; 0x%lx-0x%lx, wr %d, stack: %s ",
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rp->p_name, rp->p_endpoint, rp->p_vmrequest.who,
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rp->p_vmrequest.start,
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rp->p_vmrequest.start + rp->p_vmrequest.length,
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rp->p_vmrequest.writeflag, rp->p_vmrequest.stacktrace);
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printf("type %d\n", rp->p_vmrequest.type);
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#endif
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#if DEBUG_VMASSERT
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okendpt(rp->p_vmrequest.who, &proc_nr);
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target = proc_addr(proc_nr);
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#if 0
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if(!RTS_ISSET(target, RTS_VMREQTARGET)) {
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printf("set stack: %s\n", rp->p_vmrequest.stacktrace);
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minix_panic("RTS_VMREQTARGET not set for target",
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NO_NUM);
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}
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#endif
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#endif
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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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m_ptr->SVMCTL_MRG_REQUESTOR = (void *) rp->p_endpoint;
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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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vmassert(RTS_ISSET(p, RTS_VMREQUEST));
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vmassert(p->p_vmrequest.vmresult == VMSUSPEND);
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okendpt(p->p_vmrequest.who, &proc_nr);
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target = proc_addr(proc_nr);
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p->p_vmrequest.vmresult = m_ptr->SVMCTL_VALUE;
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vmassert(p->p_vmrequest.vmresult != VMSUSPEND);
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#if DEBUG_VMASSERT
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if(p->p_vmrequest.vmresult != OK)
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kprintf("SYSTEM: VM replied %d to mem request\n",
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p->p_vmrequest.vmresult);
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printf("memreq reply: vm request sent by: %s / %d about %d; 0x%lx-0x%lx, wr %d, stack: %s ",
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p->p_name, p->p_endpoint, p->p_vmrequest.who,
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p->p_vmrequest.start,
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p->p_vmrequest.start + p->p_vmrequest.length,
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p->p_vmrequest.writeflag, p->p_vmrequest.stacktrace);
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printf("type %d\n", p->p_vmrequest.type);
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vmassert(RTS_ISSET(target, RTS_VMREQTARGET));
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RTS_LOCK_UNSET(target, RTS_VMREQTARGET);
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#endif
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if(p->p_vmrequest.type == VMSTYPE_KERNELCALL) {
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/* Put on restart chain. */
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p->p_vmrequest.nextrestart = vmrestart;
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vmrestart = p;
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} else if(p->p_vmrequest.type == VMSTYPE_DELIVERMSG) {
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vmassert(p->p_misc_flags & MF_DELIVERMSG);
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vmassert(p == target);
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vmassert(RTS_ISSET(p, RTS_VMREQUEST));
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RTS_LOCK_UNSET(p, RTS_VMREQUEST);
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} else {
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#if DEBUG_VMASSERT
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printf("suspended with stack: %s\n",
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p->p_vmrequest.stacktrace);
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#endif
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minix_panic("strange request type",
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p->p_vmrequest.type);
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}
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return OK;
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case VMCTL_ENABLE_PAGING:
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/*
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* system task must not get preempted while switching to paging,
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* interrupt handling is not safe
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*/
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lock;
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if(vm_running)
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minix_panic("do_vmctl: paging already enabled", NO_NUM);
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vm_init(p);
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if(!vm_running)
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minix_panic("do_vmctl: paging enabling failed", NO_NUM);
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vmassert(p->p_delivermsg_lin ==
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umap_local(p, D, p->p_delivermsg_vir, sizeof(message)));
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if ((err = arch_enable_paging()) != OK) {
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unlock;
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return err;
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}
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if(newmap(p, (struct mem_map *) m_ptr->SVMCTL_VALUE) != OK)
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minix_panic("do_vmctl: newmap failed", NO_NUM);
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FIXLINMSG(p);
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vmassert(p->p_delivermsg_lin);
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unlock;
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return OK;
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case VMCTL_KERN_PHYSMAP:
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{
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int i = m_ptr->SVMCTL_VALUE;
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return arch_phys_map(i,
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(phys_bytes *) &m_ptr->SVMCTL_MAP_PHYS_ADDR,
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(phys_bytes *) &m_ptr->SVMCTL_MAP_PHYS_LEN,
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&m_ptr->SVMCTL_MAP_FLAGS);
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}
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case VMCTL_KERN_MAP_REPLY:
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{
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return arch_phys_map_reply(m_ptr->SVMCTL_VALUE,
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(vir_bytes) m_ptr->SVMCTL_MAP_VIR_ADDR);
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}
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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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