minix/kernel/arch/i386/arch_do_vmctl.c
Ben Gras 35cc7fbeb8 kernel: invlpg facility
. only use for single-page invalidations initially
	. shows tiny but statistically significant performance
	  improvement; will be more helpful in certain VM debug
	  modes
2011-08-12 13:08:27 +00:00

76 lines
1.7 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 "kernel/system.h"
#include <minix/type.h>
#include "arch_proto.h"
/*===========================================================================*
* 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_SETADDRSPACE:
/* Set process CR3. */
if(m_ptr->SVMCTL_PTROOT) {
p->p_seg.p_cr3 = m_ptr->SVMCTL_PTROOT;
p->p_seg.p_cr3_v = (u32_t *) m_ptr->SVMCTL_PTROOT_V;
p->p_misc_flags |= MF_FULLVM;
if(p == get_cpulocal_var(ptproc)) {
write_cr3(p->p_seg.p_cr3);
}
} else {
p->p_seg.p_cr3 = 0;
p->p_seg.p_cr3_v = NULL;
p->p_misc_flags &= ~MF_FULLVM;
}
RTS_UNSET(p, RTS_VMINHIBIT);
return OK;
case VMCTL_INCSP:
/* Increase process SP. */
p->p_reg.sp += m_ptr->SVMCTL_VALUE;
return OK;
case VMCTL_I386_KERNELLIMIT:
{
int r;
/* VM wants kernel to increase its segment. */
r = prot_set_kern_seg_limit(m_ptr->SVMCTL_VALUE);
return r;
}
case VMCTL_I386_FREEPDE:
{
i386_freepde(m_ptr->SVMCTL_VALUE);
return OK;
}
case VMCTL_FLUSHTLB:
{
reload_cr3();
return OK;
}
case VMCTL_I386_INVLPG:
{
i386_invlpg(m_ptr->SVMCTL_VALUE);
return OK;
}
}
printf("arch_do_vmctl: strange param %d\n", m_ptr->SVMCTL_PARAM);
return EINVAL;
}