minix/kernel/arch/i386/arch_do_vmctl.c
2008-12-11 14:17:45 +00:00

60 lines
1.6 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_VMCTL
*
* The parameters for this kernel call are:
* SVMCTL_WHO which process
* SVMCTL_PARAM set this setting (VMCTL_*)
* SVMCTL_VALUE to this value
*/
#include "../../system.h"
#include <minix/type.h>
extern u32_t kernel_cr3;
/*===========================================================================*
* arch_do_vmctl *
*===========================================================================*/
PUBLIC int arch_do_vmctl(m_ptr, p)
register message *m_ptr; /* pointer to request message */
struct proc *p;
{
switch(m_ptr->SVMCTL_PARAM) {
case VMCTL_I386_GETCR3:
/* Get process CR3. */
m_ptr->SVMCTL_VALUE = p->p_seg.p_cr3;
return OK;
case VMCTL_I386_SETCR3:
/* Set process CR3. */
if(m_ptr->SVMCTL_VALUE) {
p->p_seg.p_cr3 = m_ptr->SVMCTL_VALUE;
p->p_misc_flags |= MF_FULLVM;
} else {
p->p_seg.p_cr3 = kernel_cr3;
p->p_misc_flags &= ~MF_FULLVM;
}
RTS_LOCK_UNSET(p, VMINHIBIT);
return OK;
case VMCTL_INCSP:
/* Increase process SP. */
p->p_reg.sp += m_ptr->SVMCTL_VALUE;
return OK;
case VMCTL_GET_PAGEFAULT:
{
struct proc *rp;
if(!(rp=pagefaults))
return ESRCH;
pagefaults = rp->p_nextpagefault;
if(!RTS_ISSET(rp, PAGEFAULT))
minix_panic("non-PAGEFAULT process on pagefault chain",
rp->p_endpoint);
m_ptr->SVMCTL_PF_WHO = rp->p_endpoint;
m_ptr->SVMCTL_PF_I386_CR2 = rp->p_pagefault.pf_virtual;
m_ptr->SVMCTL_PF_I386_ERR = rp->p_pagefault.pf_flags;
return OK;
}
}
kprintf("arch_do_vmctl: strange param %d\n", m_ptr->SVMCTL_PARAM);
return EINVAL;
}