61 lines
1.6 KiB
C
61 lines
1.6 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 <minix/type.h>
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extern u32_t kernel_cr3;
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/*===========================================================================*
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* arch_do_vmctl *
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*===========================================================================*/
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PUBLIC int arch_do_vmctl(m_ptr, p)
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register message *m_ptr; /* pointer to request message */
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struct proc *p;
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{
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switch(m_ptr->SVMCTL_PARAM) {
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case VMCTL_I386_GETCR3:
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/* Get process CR3. */
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m_ptr->SVMCTL_VALUE = p->p_seg.p_cr3;
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return OK;
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case VMCTL_I386_SETCR3:
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/* Set process CR3. */
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if(m_ptr->SVMCTL_VALUE) {
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p->p_seg.p_cr3 = m_ptr->SVMCTL_VALUE;
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p->p_misc_flags |= MF_FULLVM;
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} else {
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p->p_seg.p_cr3 = kernel_cr3;
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p->p_misc_flags &= ~MF_FULLVM;
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}
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RTS_LOCK_UNSET(p, VMINHIBIT);
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return OK;
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case VMCTL_INCSP:
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/* Increase process SP. */
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p->p_reg.sp += m_ptr->SVMCTL_VALUE;
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return OK;
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case VMCTL_GET_PAGEFAULT:
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{
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struct proc *rp;
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if(!(rp=pagefaults))
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return ESRCH;
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pagefaults = rp->p_nextpagefault;
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if(!RTS_ISSET(rp, PAGEFAULT))
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minix_panic("non-PAGEFAULT process on pagefault chain",
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rp->p_endpoint);
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m_ptr->SVMCTL_PF_WHO = rp->p_endpoint;
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m_ptr->SVMCTL_PF_I386_CR2 = rp->p_pagefault.pf_virtual;
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m_ptr->SVMCTL_PF_I386_ERR = rp->p_pagefault.pf_flags;
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return OK;
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}
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}
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kprintf("arch_do_vmctl: strange param %d\n", m_ptr->SVMCTL_PARAM);
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return EINVAL;
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}
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