32fbbd370c
shared with the kernel, mapped into kernel address space; kernel is notified of its location. kernel segment size is increased to make it fit. - map in kernel and other processes that don't have their own page table using single 4MB (global) mapping. - new sanity check facility: objects that are allocated with the slab allocator are, when running with sanity checking on, marked readonly until they are explicitly unlocked using the USE() macro. - another sanity check facility: collect all uses of memory and see if they don't overlap with (a) eachother and (b) free memory - own munmap() and munmap_text() functions. - exec() recovers from out-of-memory conditions properly now; this solves some weird exec() behaviour - chew off memory from the same side of the chunk as where we start scanning, solving some memory fragmentation issues - use avl trees for freelist and phys_ranges in regions - implement most useful part of munmap() - remap() stuff is GQ's for shared memory
132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
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#define _SYSTEM 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/bitmap.h>
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#include <errno.h>
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#include <env.h>
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#include "glo.h"
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#include "proto.h"
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#include "util.h"
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#include "sanitycheck.h"
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PUBLIC void free_proc(struct vmproc *vmp)
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{
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if(vmp->vm_flags & VMF_HASPT) {
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vmp->vm_flags &= ~VMF_HASPT;
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pt_free(&vmp->vm_pt);
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}
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map_free_proc(vmp);
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vmp->vm_regions = NULL;
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#if VMSTATS
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vmp->vm_bytecopies = 0;
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#endif
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}
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PUBLIC void clear_proc(struct vmproc *vmp)
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{
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vmp->vm_regions = NULL;
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vmp->vm_callback = NULL; /* No pending vfs callback. */
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vmp->vm_flags = 0; /* Clear INUSE, so slot is free. */
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vmp->vm_count = 0;
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vmp->vm_heap = NULL;
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#if VMSTATS
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vmp->vm_bytecopies = 0;
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#endif
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}
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/*===========================================================================*
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* do_exit *
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*===========================================================================*/
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PUBLIC int do_exit(message *msg)
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{
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int proc;
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struct vmproc *vmp;
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SANITYCHECK(SCL_FUNCTIONS);
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if(vm_isokendpt(msg->VME_ENDPOINT, &proc) != OK) {
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printf("VM: bogus endpoint VM_EXIT %d\n", msg->VME_ENDPOINT);
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return EINVAL;
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}
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vmp = &vmproc[proc];
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if(!(vmp->vm_flags & VMF_EXITING)) {
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printf("VM: unannounced VM_EXIT %d\n", msg->VME_ENDPOINT);
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return EINVAL;
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}
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if(vmp->vm_flags & VMF_HAS_DMA) {
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release_dma(vmp);
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} else if(vmp->vm_flags & VMF_HASPT) {
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/* Free pagetable and pages allocated by pt code. */
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SANITYCHECK(SCL_DETAIL);
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free_proc(vmp);
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SANITYCHECK(SCL_DETAIL);
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} else {
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/* Free the data and stack segments. */
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FREE_MEM(vmp->vm_arch.vm_seg[D].mem_phys,
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vmp->vm_arch.vm_seg[S].mem_vir +
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vmp->vm_arch.vm_seg[S].mem_len -
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vmp->vm_arch.vm_seg[D].mem_vir);
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if (find_share(vmp, vmp->vm_ino, vmp->vm_dev, vmp->vm_ctime) == NULL) {
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/* No other process shares the text segment,
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* so free it.
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*/
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FREE_MEM(vmp->vm_arch.vm_seg[T].mem_phys,
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vmp->vm_arch.vm_seg[T].mem_len);
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}
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}
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SANITYCHECK(SCL_DETAIL);
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/* Reset process slot fields. */
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clear_proc(vmp);
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SANITYCHECK(SCL_FUNCTIONS);
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return OK;
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}
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/*===========================================================================*
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* do_willexit *
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*===========================================================================*/
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PUBLIC int do_willexit(message *msg)
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{
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int proc;
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struct vmproc *vmp;
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if(vm_isokendpt(msg->VMWE_ENDPOINT, &proc) != OK) {
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printf("VM: bogus endpoint VM_EXITING %d\n",
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msg->VMWE_ENDPOINT);
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return EINVAL;
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}
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vmp = &vmproc[proc];
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vmp->vm_flags |= VMF_EXITING;
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return OK;
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}
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PUBLIC void _exit(int code)
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{
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sys_exit(SELF);
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}
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PUBLIC void __exit(int code)
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{
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sys_exit(SELF);
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}
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