268 lines
7.5 KiB
C
268 lines
7.5 KiB
C
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/* This file contains some utility routines for VM. */
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#define _SYSTEM 1
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#define _MINIX 1 /* To get the brk() prototype (as _brk()). */
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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/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/type.h>
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#include <minix/bitmap.h>
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#include <string.h>
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#include <errno.h>
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#include <env.h>
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#include <unistd.h>
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#include <memory.h>
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#include <assert.h>
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#include <sys/param.h>
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#include "proto.h"
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#include "glo.h"
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#include "util.h"
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#include "region.h"
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#include "sanitycheck.h"
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#include <machine/archtypes.h>
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#include "kernel/const.h"
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#include "kernel/config.h"
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#include "kernel/type.h"
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#include "kernel/proc.h"
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/*===========================================================================*
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* get_mem_chunks *
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*===========================================================================*/
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void get_mem_chunks(mem_chunks)
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struct memory *mem_chunks; /* store mem chunks here */
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{
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/* Initialize the free memory list from the 'memory' boot variable. Translate
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* the byte offsets and sizes in this list to clicks, properly truncated.
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*/
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phys_bytes base, size, limit;
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int i;
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struct memory *memp;
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/* Obtain and parse memory from system environment. */
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if(env_memory_parse(mem_chunks, NR_MEMS) != OK)
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panic("couldn't obtain memory chunks");
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/* Round physical memory to clicks. Round start up, round end down. */
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for (i = 0; i < NR_MEMS; i++) {
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memp = &mem_chunks[i]; /* next mem chunk is stored here */
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base = mem_chunks[i].base;
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size = mem_chunks[i].size;
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limit = base + size;
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base = (phys_bytes) (CLICK_CEIL(base));
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limit = (phys_bytes) (CLICK_FLOOR(limit));
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if (limit <= base) {
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memp->base = memp->size = 0;
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} else {
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memp->base = base >> CLICK_SHIFT;
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memp->size = (limit - base) >> CLICK_SHIFT;
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}
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}
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}
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/*===========================================================================*
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* vm_isokendpt *
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*===========================================================================*/
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int vm_isokendpt(endpoint_t endpoint, int *proc)
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{
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*proc = _ENDPOINT_P(endpoint);
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if(*proc < 0 || *proc >= NR_PROCS)
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return EINVAL;
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if(*proc >= 0 && endpoint != vmproc[*proc].vm_endpoint)
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return EDEADEPT;
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if(*proc >= 0 && !(vmproc[*proc].vm_flags & VMF_INUSE))
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return EDEADEPT;
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return OK;
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}
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/*===========================================================================*
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* do_info *
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*===========================================================================*/
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int do_info(message *m)
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{
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struct vm_stats_info vsi;
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struct vm_usage_info vui;
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static struct vm_region_info vri[MAX_VRI_COUNT];
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struct vmproc *vmp;
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vir_bytes addr, size, next, ptr;
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int r, pr, dummy, count, free_pages, largest_contig;
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if (vm_isokendpt(m->m_source, &pr) != OK)
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return EINVAL;
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vmp = &vmproc[pr];
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ptr = (vir_bytes) m->VMI_PTR;
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switch(m->VMI_WHAT) {
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case VMIW_STATS:
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vsi.vsi_pagesize = VM_PAGE_SIZE;
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vsi.vsi_total = total_pages;
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memstats(&dummy, &free_pages, &largest_contig);
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vsi.vsi_free = free_pages;
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vsi.vsi_largest = largest_contig;
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get_stats_info(&vsi);
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addr = (vir_bytes) &vsi;
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size = sizeof(vsi);
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break;
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case VMIW_USAGE:
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if(m->VMI_EP < 0)
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get_usage_info_kernel(&vui);
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else if (vm_isokendpt(m->VMI_EP, &pr) != OK)
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return EINVAL;
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else get_usage_info(&vmproc[pr], &vui);
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addr = (vir_bytes) &vui;
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size = sizeof(vui);
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break;
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case VMIW_REGION:
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if (vm_isokendpt(m->VMI_EP, &pr) != OK)
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return EINVAL;
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count = MIN(m->VMI_COUNT, MAX_VRI_COUNT);
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next = m->VMI_NEXT;
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count = get_region_info(&vmproc[pr], vri, count, &next);
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m->VMI_COUNT = count;
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m->VMI_NEXT = next;
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addr = (vir_bytes) vri;
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size = sizeof(vri[0]) * count;
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break;
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default:
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return EINVAL;
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}
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if (size == 0)
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return OK;
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/* Make sure that no page faults can occur while copying out. A page
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* fault would cause the kernel to send a notify to us, while we would
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* be waiting for the result of the copy system call, resulting in a
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* deadlock. Note that no memory mapping can be undone without the
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* involvement of VM, so we are safe until we're done.
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*/
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r = handle_memory(vmp, ptr, size, 1 /*wrflag*/);
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if (r != OK) return r;
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/* Now that we know the copy out will succeed, perform the actual copy
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* operation.
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*/
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return sys_datacopy(SELF, addr,
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(vir_bytes) vmp->vm_endpoint, ptr, size);
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}
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/*===========================================================================*
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* swap_proc_slot *
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*===========================================================================*/
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int swap_proc_slot(struct vmproc *src_vmp, struct vmproc *dst_vmp)
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{
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struct vmproc orig_src_vmproc, orig_dst_vmproc;
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#if LU_DEBUG
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printf("VM: swap_proc: swapping %d (%d) and %d (%d)\n",
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src_vmp->vm_endpoint, src_vmp->vm_slot,
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dst_vmp->vm_endpoint, dst_vmp->vm_slot);
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#endif
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/* Save existing data. */
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orig_src_vmproc = *src_vmp;
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orig_dst_vmproc = *dst_vmp;
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/* Swap slots. */
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*src_vmp = orig_dst_vmproc;
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*dst_vmp = orig_src_vmproc;
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/* Preserve endpoints and slot numbers. */
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src_vmp->vm_endpoint = orig_src_vmproc.vm_endpoint;
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src_vmp->vm_slot = orig_src_vmproc.vm_slot;
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dst_vmp->vm_endpoint = orig_dst_vmproc.vm_endpoint;
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dst_vmp->vm_slot = orig_dst_vmproc.vm_slot;
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#if LU_DEBUG
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printf("VM: swap_proc: swapped %d (%d) and %d (%d)\n",
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src_vmp->vm_endpoint, src_vmp->vm_slot,
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dst_vmp->vm_endpoint, dst_vmp->vm_slot);
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#endif
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return OK;
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}
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/*===========================================================================*
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* swap_proc_dyn_data *
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*===========================================================================*/
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int swap_proc_dyn_data(struct vmproc *src_vmp, struct vmproc *dst_vmp)
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{
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int is_vm;
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int r;
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is_vm = (dst_vmp->vm_endpoint == VM_PROC_NR);
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/* For VM, transfer memory regions above the stack first. */
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if(is_vm) {
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#if LU_DEBUG
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printf("VM: swap_proc_dyn_data: tranferring regions above the stack from old VM (%d) to new VM (%d)\n",
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src_vmp->vm_endpoint, dst_vmp->vm_endpoint);
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#endif
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r = pt_map_in_range(src_vmp, dst_vmp, VM_STACKTOP, 0);
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if(r != OK) {
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printf("swap_proc_dyn_data: pt_map_in_range failed\n");
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return r;
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}
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}
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#if LU_DEBUG
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printf("VM: swap_proc_dyn_data: swapping regions' parents for %d (%d) and %d (%d)\n",
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src_vmp->vm_endpoint, src_vmp->vm_slot,
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dst_vmp->vm_endpoint, dst_vmp->vm_slot);
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#endif
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/* Swap vir_regions' parents. */
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map_setparent(src_vmp);
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map_setparent(dst_vmp);
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/* For regular processes, transfer regions above the stack now.
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* In case of rollback, we need to skip this step. To sandbox the
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* new instance and prevent state corruption on rollback, we share all
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* the regions between the two instances as COW.
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*/
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if(!is_vm) {
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struct vir_region *vr;
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vr = map_lookup(dst_vmp, VM_STACKTOP, NULL);
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if(vr && !map_lookup(src_vmp, VM_STACKTOP, NULL)) {
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#if LU_DEBUG
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printf("VM: swap_proc_dyn_data: tranferring regions above the stack from %d to %d\n",
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src_vmp->vm_endpoint, dst_vmp->vm_endpoint);
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#endif
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r = map_proc_copy_from(src_vmp, dst_vmp, vr);
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if(r != OK) {
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return r;
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}
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}
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}
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return OK;
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}
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