40f440b8cd
- substituted the use of the m_source message field by caller->p_endpoint in kernel calls. It is the same information, just passed more intuitively. - the last dependency on m_type field is removed. - do_unused() is substituted by a check for NULL. - this pretty much removes the depency of kernel calls on the general message format. In the future this may be used to pass the kcall arguments in a different structure or registers (x86-64, ARM?) The kcall number may be passed in a register already.
147 lines
3.9 KiB
C
147 lines
3.9 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 "kernel/system.h"
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#include "kernel/vm.h"
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#include "kernel/debug.h"
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#include <assert.h>
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#include <minix/type.h>
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/*===========================================================================*
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* do_vmctl *
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*===========================================================================*/
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PUBLIC int do_vmctl(struct proc * caller, message * m_ptr)
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{
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int proc_nr;
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endpoint_t ep = m_ptr->SVMCTL_WHO;
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struct proc *p, *rp, *target;
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if(ep == SELF) { ep = caller->p_endpoint; }
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if(!isokendpt(ep, &proc_nr)) {
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printf("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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assert(RTS_ISSET(p,RTS_PAGEFAULT));
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RTS_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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assert(RTS_ISSET(rp, RTS_VMREQUEST));
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okendpt(rp->p_vmrequest.target, &proc_nr);
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target = proc_addr(proc_nr);
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/* Reply with request fields. */
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switch(rp->p_vmrequest.req_type) {
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case VMPTYPE_CHECK:
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m_ptr->SVMCTL_MRG_TARGET =
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rp->p_vmrequest.target;
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m_ptr->SVMCTL_MRG_ADDR =
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rp->p_vmrequest.params.check.start;
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m_ptr->SVMCTL_MRG_LENGTH =
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rp->p_vmrequest.params.check.length;
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m_ptr->SVMCTL_MRG_FLAG =
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rp->p_vmrequest.params.check.writeflag;
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m_ptr->SVMCTL_MRG_REQUESTOR =
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(void *) rp->p_endpoint;
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break;
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case VMPTYPE_SMAP:
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case VMPTYPE_SUNMAP:
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case VMPTYPE_COWMAP:
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assert(RTS_ISSET(target,RTS_VMREQTARGET));
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RTS_UNSET(target, RTS_VMREQTARGET);
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m_ptr->SVMCTL_MRG_TARGET =
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rp->p_vmrequest.target;
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m_ptr->SVMCTL_MRG_ADDR =
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rp->p_vmrequest.params.map.vir_d;
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m_ptr->SVMCTL_MRG_EP2 =
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rp->p_vmrequest.params.map.ep_s;
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m_ptr->SVMCTL_MRG_ADDR2 =
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rp->p_vmrequest.params.map.vir_s;
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m_ptr->SVMCTL_MRG_LENGTH =
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rp->p_vmrequest.params.map.length;
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m_ptr->SVMCTL_MRG_FLAG =
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rp->p_vmrequest.params.map.writeflag;
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m_ptr->SVMCTL_MRG_REQUESTOR =
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(void *) rp->p_endpoint;
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break;
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default:
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panic("VMREQUEST wrong type");
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}
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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 rp->p_vmrequest.req_type;
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case VMCTL_MEMREQ_REPLY:
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assert(RTS_ISSET(p, RTS_VMREQUEST));
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assert(p->p_vmrequest.vmresult == VMSUSPEND);
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okendpt(p->p_vmrequest.target, &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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assert(p->p_vmrequest.vmresult != VMSUSPEND);
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switch(p->p_vmrequest.type) {
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case VMSTYPE_KERNELCALL:
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/*
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* we will have to resume execution of the kernel call
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* as soon the scheduler picks up this process again
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*/
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p->p_misc_flags |= MF_KCALL_RESUME;
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break;
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case VMSTYPE_DELIVERMSG:
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assert(p->p_misc_flags & MF_DELIVERMSG);
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assert(p == target);
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assert(RTS_ISSET(p, RTS_VMREQUEST));
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break;
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case VMSTYPE_MAP:
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assert(RTS_ISSET(p, RTS_VMREQUEST));
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break;
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default:
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panic("strange request type: %d",p->p_vmrequest.type);
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}
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RTS_UNSET(p, RTS_VMREQUEST);
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return OK;
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case VMCTL_ENABLE_PAGING:
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if(vm_running)
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panic("do_vmctl: paging already enabled");
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vm_init(p);
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if(!vm_running)
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panic("do_vmctl: paging enabling failed");
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return arch_enable_paging(caller, m_ptr);
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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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