13a0d5fa5e
- most global variables carry information which is specific to the local CPU and each CPU must have its own copy - cpu local variable must be declared in cpulocal.h between DECLARE_CPULOCAL_START and DECLARE_CPULOCAL_END markers using DECLARE_CPULOCAL macro - to access the cpu local data the provided macros must be used get_cpu_var(cpu, name) get_cpu_var_ptr(cpu, name) get_cpulocal_var(name) get_cpulocal_var_ptr(name) - using this macros makes future changes in the implementation possible - switching to ELF will make the declaration of cpu local data much simpler, e.g. CPULOCAL int blah; anywhere in the kernel source code
71 lines
1.6 KiB
C
71 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 "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;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
printf("arch_do_vmctl: strange param %d\n", m_ptr->SVMCTL_PARAM);
|
|
return EINVAL;
|
|
}
|