#include <lunaix/syscall.h>
#include <lunaix/syscall_utils.h>
+#include <sys/mm/mempart.h>
+
// any size beyond this is bullshit
-#define BS_SIZE (KERNEL_MM_BASE - UMMAP_START)
+#define BS_SIZE (KERNEL_EXEC - USR_MMAP)
int
mem_has_overlap(vm_regions_t* regions, ptr_t start, ptr_t end)
{
assert_msg(addr, "addr can not be NULL");
- ptr_t last_end = USER_START, found_loc = addr;
+ ptr_t last_end = USR_EXEC, found_loc = addr;
struct mm_region *pos, *n;
vm_regions_t* vm_regions = ¶m->pvms->regions;
if (pos->start > found_loc && avail_space > param->mlen) {
goto found;
}
- found_loc = pos->end + PG_SIZE;
+ found_loc = pos->end + MEM_PAGE;
}
last_end = pos->end;
return ENOMEM;
found:
- if (found_loc >= KERNEL_MM_BASE || found_loc < USER_START) {
+ if (found_loc >= KERNEL_EXEC || found_loc < USR_EXEC) {
return ENOMEM;
}
size_t offset = mapping.va - region->start + region->foff;
struct v_inode* inode = region->mfile->inode;
- region->mfile->ops->write_page(
- inode, (void*)mapping.va, PG_SIZE, offset);
+ region->mfile->ops->write_page(inode, (void*)mapping.va, offset);
*mapping.pte &= ~PG_DIRTY;
- cpu_invplg((ptr_t)mapping.pte);
+ cpu_flush_page((ptr_t)mapping.pte);
} else if ((options & MS_INVALIDATE)) {
goto invalidate;
}
invalidate:
*mapping.pte &= ~PG_PRESENT;
pmm_free_page(KERNEL_PID, mapping.pa);
- cpu_invplg((ptr_t)mapping.pte);
+ cpu_flush_page((ptr_t)mapping.pte);
}
}
region_release(region);
}
+// Case: head inseted, tail inseted
+#define CASE_HITI(vmr, addr, len) \
+ ((vmr)->start <= (addr) && ((addr) + (len)) <= (vmr)->end)
+
+// Case: head inseted, tail extruded
+#define CASE_HITE(vmr, addr, len) \
+ ((vmr)->start <= (addr) && ((addr) + (len)) > (vmr)->end)
+
+// Case: head extruded, tail inseted
+#define CASE_HETI(vmr, addr, len) \
+ ((vmr)->start > (addr) && ((addr) + (len)) <= (vmr)->end)
+
+// Case: head extruded, tail extruded
+#define CASE_HETE(vmr, addr, len) \
+ ((vmr)->start > (addr) && ((addr) + (len)) > (vmr)->end)
+
+static void
+__unmap_overlapped_cases(ptr_t mnt,
+ struct mm_region* vmr,
+ ptr_t* addr,
+ size_t* length)
+{
+ // seg start, umapped segement start
+ ptr_t seg_start = *addr, umps_start = 0;
+
+ // seg len, umapped segement len
+ size_t seg_len = *length, umps_len = 0;
+
+ size_t displ = 0, shrink = 0;
+
+ if (CASE_HITI(vmr, seg_start, seg_len)) {
+ size_t new_start = seg_start + seg_len;
+
+ // Require a split
+ if (new_start < vmr->end) {
+ struct mm_region* region = region_dup(vmr);
+ if (region->mfile) {
+ size_t f_shifted = new_start - region->start;
+ region->foff += f_shifted;
+ region->flen = MAX(region->flen, f_shifted) - f_shifted;
+ }
+ region->start = new_start;
+ llist_insert_after(&vmr->head, ®ion->head);
+ }
+
+ shrink = vmr->end - seg_start;
+ umps_len = shrink;
+ umps_start = seg_start;
+ } else if (CASE_HITE(vmr, seg_start, seg_len)) {
+ shrink = vmr->end - seg_start;
+ umps_len = shrink;
+ umps_start = seg_start;
+ } else if (CASE_HETI(vmr, seg_start, seg_len)) {
+ displ = seg_len - (vmr->start - seg_start);
+ umps_len = displ;
+ umps_start = vmr->start;
+ } else if (CASE_HETE(vmr, seg_start, seg_len)) {
+ shrink = vmr->end - vmr->start;
+ umps_len = shrink;
+ umps_start = vmr->start;
+ }
+
+ mem_sync_pages(mnt, vmr, vmr->start, umps_len, 0);
+ for (size_t i = 0; i < umps_len; i += PG_SIZE) {
+ ptr_t pa = vmm_del_mapping(mnt, vmr->start + i);
+ if (pa) {
+ pmm_free_page(vmr->proc_vms->pid, pa);
+ }
+ }
+
+ vmr->start += displ;
+ vmr->end -= shrink;
+
+ if (vmr->start >= vmr->end) {
+ llist_delete(&vmr->head);
+ region_release(vmr);
+ } else if (vmr->mfile) {
+ vmr->foff += displ;
+ vmr->flen = MAX(vmr->flen, displ) - displ;
+ }
+
+ *addr = umps_start + umps_len;
+
+ size_t ump_len = *addr - seg_start;
+ *length = MAX(seg_len, ump_len) - ump_len;
+}
+
int
mem_unmap(ptr_t mnt, vm_regions_t* regions, ptr_t addr, size_t length)
{
llist_for_each(pos, n, regions, head)
{
- if (pos->start <= cur_addr && pos->end >= cur_addr) {
+ u32_t l = pos->start - cur_addr;
+ if ((pos->start <= cur_addr && cur_addr < pos->end) || l <= length) {
break;
}
}
- while (&pos->head != regions && cur_addr >= pos->start) {
- u32_t l = pos->end - cur_addr;
- pos->end = cur_addr;
-
- if (l > length) {
- // unmap cause discontinunity in a memory region - do split
- struct mm_region* region = valloc(sizeof(struct mm_region));
- *region = *pos;
- region->start = cur_addr + length;
- llist_insert_after(&pos->head, ®ion->head);
- l = length;
- }
-
- mem_sync_pages(mnt, pos, cur_addr, l, 0);
-
- for (size_t i = 0; i < l; i += PG_SIZE) {
- ptr_t pa = vmm_del_mapping(mnt, cur_addr + i);
- if (pa) {
- pmm_free_page(pos->proc_vms->pid, pa);
- }
- }
-
+ while (&pos->head != regions && length) {
n = container_of(pos->head.next, typeof(*pos), head);
- if (pos->end == pos->start) {
- llist_delete(&pos->head);
- region_release(pos);
- }
+ __unmap_overlapped_cases(mnt, pos, &cur_addr, &length);
pos = n;
- length -= l;
- cur_addr += length;
}
return 0;
}
if (!addr_ptr) {
- addr_ptr = UMMAP_START;
- } else if (addr_ptr < UMMAP_START || addr_ptr + length >= UMMAP_END) {
+ addr_ptr = USR_MMAP;
+ } else if (addr_ptr < USR_MMAP || addr_ptr + length >= USR_MMAP_END) {
if (!(options & (MAP_FIXED | MAP_FIXED_NOREPLACE))) {
errno = ENOMEM;
goto done;
struct mmap_param param = { .flags = options,
.mlen = ROUNDUP(length, PG_SIZE),
+ .flen = length,
.offset = offset,
.type = REGION_TYPE_GENERAL,
.proct = proct,
git://scm.lunaixsky.com / lunaix-os.git / blobdiff