X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/9b8e0c494de6b447b44454112748f702dffec90d..78cd005fac540973751b5a108c37a715bc64b5a2:/lunaix-os/kernel/mm/mmap.c

diff --git a/lunaix-os/kernel/mm/mmap.c b/lunaix-os/kernel/mm/mmap.c
index c1ebe09..d39269c 100644
--- a/lunaix-os/kernel/mm/mmap.c
+++ b/lunaix-os/kernel/mm/mmap.c
@@ -7,65 +7,152 @@
 #include <lunaix/syscall.h>
 #include <lunaix/syscall_utils.h>
 
+#include <sys/mm/mempart.h>
+
 // any size beyond this is bullshit
-#define BS_SIZE (2 << 30)
+#define BS_SIZE (KERNEL_EXEC - USR_MMAP)
+
+int
+mem_has_overlap(vm_regions_t* regions, ptr_t start, ptr_t end)
+{
+    struct mm_region *pos, *n;
+    llist_for_each(pos, n, regions, head)
+    {
+        if (pos->end >= start && pos->start < start) {
+            return 1;
+        }
+
+        if (pos->end <= end && pos->start >= start) {
+            return 1;
+        }
+
+        if (pos->end >= end && pos->start < end) {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+int
+mem_adjust_inplace(vm_regions_t* regions,
+                   struct mm_region* region,
+                   ptr_t newend)
+{
+    ssize_t len = newend - region->start;
+    if (len == 0) {
+        return 0;
+    }
+
+    if (len < 0) {
+        return EINVAL;
+    }
+
+    if (mem_has_overlap(regions, region->start, newend)) {
+        return ENOMEM;
+    }
+
+    region->end = newend;
+
+    return 0;
+}
 
 int
 mem_map(void** addr_out,
-        ptr_t mnt,
-        vm_regions_t* regions,
-        void* addr,
+        struct mm_region** created,
+        ptr_t addr,
         struct v_file* file,
-        off_t offset,
-        size_t length,
-        u32_t proct,
-        u32_t options)
+        struct mmap_param* param)
 {
-    ptr_t last_end = USER_START;
+    assert_msg(addr, "addr can not be NULL");
+
+    ptr_t last_end = USR_EXEC, found_loc = addr;
     struct mm_region *pos, *n;
 
-    if ((options & MAP_FIXED)) {
-        pos = region_get(regions, addr);
-        if (!pos) {
-            last_end = addr;
-            goto found;
+    vm_regions_t* vm_regions = &param->pvms->regions;
+
+    if ((param->flags & MAP_FIXED_NOREPLACE)) {
+        if (mem_has_overlap(vm_regions, found_loc, param->mlen + found_loc)) {
+            return EEXIST;
         }
-        return EEXIST;
+        goto found;
     }
 
-    llist_for_each(pos, n, regions, head)
+    if ((param->flags & MAP_FIXED)) {
+        int status =
+          mem_unmap(param->vms_mnt, vm_regions, found_loc, param->mlen);
+        if (status) {
+            return status;
+        }
+        goto found;
+    }
+
+    llist_for_each(pos, n, vm_regions, head)
     {
-        if (pos->start - last_end >= length && last_end >= addr) {
-            goto found;
+        if (last_end < found_loc) {
+            size_t avail_space = pos->start - found_loc;
+            if (pos->start > found_loc && avail_space > param->mlen) {
+                goto found;
+            }
+            found_loc = pos->end + MEM_PAGE;
         }
+
         last_end = pos->end;
     }
 
     return ENOMEM;
 
 found:
-    addr = last_end;
+    if (found_loc >= KERNEL_EXEC || found_loc < USR_EXEC) {
+        return ENOMEM;
+    }
+
+    struct mm_region* region = region_create_range(
+      found_loc,
+      param->mlen,
+      ((param->proct | param->flags) & 0x3f) | (param->type & ~0xffff));
 
-    struct mm_region* region =
-      region_create_range(addr, length, proct | (options & 0x1f));
     region->mfile = file;
-    region->offset = offset;
+    region->foff = param->offset;
+    region->flen = param->flen;
+    region->proc_vms = param->pvms;
 
-    region_add(regions, region);
+    region_add(vm_regions, region);
 
     u32_t attr = PG_ALLOW_USER;
-    if ((proct & REGION_WRITE)) {
+    if ((param->proct & REGION_WRITE)) {
         attr |= PG_WRITE;
     }
 
-    for (u32_t i = 0; i < length; i += PG_SIZE) {
-        vmm_set_mapping(mnt, addr + i, 0, attr, 0);
+    for (u32_t i = 0; i < param->mlen; i += PG_SIZE) {
+        vmm_set_mapping(param->vms_mnt, found_loc + i, 0, attr, 0);
     }
 
-    *addr_out = addr;
+    if (file) {
+        vfs_ref_file(file);
+    }
+
+    if (addr_out) {
+        *addr_out = (void*)found_loc;
+    }
+    if (created) {
+        *created = region;
+    }
     return 0;
 }
 
+int
+mem_remap(void** addr_out,
+          struct mm_region** remapped,
+          void* addr,
+          struct v_file* file,
+          struct mmap_param* param)
+{
+    // TODO
+
+    return EINVAL;
+}
+
 void
 mem_sync_pages(ptr_t mnt,
                struct mm_region* region,
@@ -82,16 +169,30 @@ mem_sync_pages(ptr_t mnt,
         if (!vmm_lookupat(mnt, start + i, &mapping)) {
             continue;
         }
+
         if (PG_IS_DIRTY(*mapping.pte)) {
-            size_t offset = mapping.va - region->start + region->offset;
+            size_t offset = mapping.va - region->start + region->foff;
             struct v_inode* inode = region->mfile->inode;
-            region->mfile->ops->write_page(inode, mapping.va, PG_SIZE, offset);
+
+            region->mfile->ops->write_page(inode, (void*)mapping.va, offset);
+
             *mapping.pte &= ~PG_DIRTY;
-            cpu_invplg(mapping.va);
+
+            cpu_flush_page((ptr_t)mapping.pte);
         } else if ((options & MS_INVALIDATE)) {
-            *mapping.pte &= ~PG_PRESENT;
-            cpu_invplg(mapping.va);
+            goto invalidate;
         }
+
+        if (options & MS_INVALIDATE_ALL) {
+            goto invalidate;
+        }
+
+        continue;
+
+    invalidate:
+        *mapping.pte &= ~PG_PRESENT;
+        pmm_free_page(KERNEL_PID, mapping.pa);
+        cpu_flush_page((ptr_t)mapping.pte);
     }
 }
 
@@ -121,52 +222,132 @@ mem_msync(ptr_t mnt,
     return 0;
 }
 
-int
-mem_unmap(ptr_t mnt, vm_regions_t* regions, void* addr, size_t length)
+void
+mem_unmap_region(ptr_t mnt, struct mm_region* region)
 {
-    length = ROUNDUP(length, PG_SIZE);
-    ptr_t cur_addr = ROUNDDOWN((ptr_t)addr, PG_SIZE);
-    struct mm_region *pos, *n;
+    size_t len = ROUNDUP(region->end - region->start, PG_SIZE);
+    mem_sync_pages(mnt, region, region->start, len, 0);
 
-    llist_for_each(pos, n, regions, head)
-    {
-        if (pos->start <= cur_addr) {
-            break;
+    for (size_t i = region->start; i <= region->end; i += PG_SIZE) {
+        ptr_t pa = vmm_del_mapping(mnt, i);
+        if (pa) {
+            pmm_free_page(__current->pid, pa);
         }
     }
+    llist_delete(&region->head);
+    region_release(region);
+}
 
-    while (&pos->head != regions && cur_addr > pos->start) {
-        u32_t l = pos->end - cur_addr;
-        pos->end = cur_addr;
+// Case: head inseted, tail inseted
+#define CASE_HITI(vmr, addr, len)                                              \
+    ((vmr)->start <= (addr) && ((addr) + (len)) <= (vmr)->end)
 
-        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, &region->head);
-            l = length;
-        }
+// Case: head inseted, tail extruded
+#define CASE_HITE(vmr, addr, len)                                              \
+    ((vmr)->start <= (addr) && ((addr) + (len)) > (vmr)->end)
 
-        mem_sync_pages(mnt, pos, cur_addr, l, 0);
+// Case: head extruded, tail inseted
+#define CASE_HETI(vmr, addr, len)                                              \
+    ((vmr)->start > (addr) && ((addr) + (len)) <= (vmr)->end)
 
-        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(__current->pid, pa);
+// 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, &region->head);
         }
 
-        n = container_of(pos->head.next, typeof(*pos), head);
-        if (pos->end == pos->start) {
-            llist_delete(&pos->head);
-            vfree(pos);
+        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)
+{
+    length = ROUNDUP(length, PG_SIZE);
+    ptr_t cur_addr = PG_ALIGN(addr);
+    struct mm_region *pos, *n;
+
+    llist_for_each(pos, n, regions, head)
+    {
+        u32_t l = pos->start - cur_addr;
+        if ((pos->start <= cur_addr && cur_addr < pos->end) || l <= length) {
+            break;
         }
+    }
+
+    while (&pos->head != regions && length) {
+        n = container_of(pos->head.next, typeof(*pos), head);
+        __unmap_overlapped_cases(mnt, pos, &cur_addr, &length);
 
         pos = n;
-        length -= l;
-        cur_addr += length;
     }
+
+    return 0;
 }
 
 __DEFINE_LXSYSCALL3(void*, sys_mmap, void*, addr, size_t, length, va_list, lst)
@@ -178,47 +359,57 @@ __DEFINE_LXSYSCALL3(void*, sys_mmap, void*, addr, size_t, length, va_list, lst)
     int errno = 0;
     void* result = (void*)-1;
 
-    if (!length || length > BS_SIZE || !PG_ALIGNED(addr)) {
+    ptr_t addr_ptr = (ptr_t)addr;
+
+    if (!length || length > BS_SIZE || !PG_ALIGNED(addr_ptr)) {
         errno = EINVAL;
         goto done;
     }
 
-    struct v_fd* vfd;
-    if ((errno = vfs_getfd(fd, &vfd))) {
-        goto done;
+    if (!addr_ptr) {
+        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 v_file* file = vfd->file;
+    struct v_file* file = NULL;
 
     if (!(options & MAP_ANON)) {
+        struct v_fd* vfd;
+        if ((errno = vfs_getfd(fd, &vfd))) {
+            goto done;
+        }
+
+        file = vfd->file;
         if (!file->ops->read_page) {
             errno = ENODEV;
             goto done;
         }
-    } else {
-        file = NULL;
     }
 
-    length = ROUNDUP(length, PG_SIZE);
+    struct mmap_param param = { .flags = options,
+                                .mlen = ROUNDUP(length, PG_SIZE),
+                                .flen = length,
+                                .offset = offset,
+                                .type = REGION_TYPE_GENERAL,
+                                .proct = proct,
+                                .pvms = (struct proc_mm*)&__current->mm,
+                                .vms_mnt = VMS_SELF };
 
-    errno = mem_map(&result,
-                    VMS_SELF,
-                    &__current->mm.regions,
-                    addr,
-                    file,
-                    offset,
-                    length,
-                    proct,
-                    options);
+    errno = mem_map(&result, NULL, addr_ptr, file, &param);
 
 done:
     __current->k_status = errno;
     return result;
 }
 
-__DEFINE_LXSYSCALL2(void, munmap, void*, addr, size_t, length)
+__DEFINE_LXSYSCALL2(int, munmap, void*, addr, size_t, length)
 {
-    return mem_unmap(VMS_SELF, &__current->mm.regions, addr, length);
+    return mem_unmap(
+      VMS_SELF, (vm_regions_t*)&__current->mm.regions, (ptr_t)addr, length);
 }
 
 __DEFINE_LXSYSCALL3(int, msync, void*, addr, size_t, length, int, flags)
@@ -227,8 +418,11 @@ __DEFINE_LXSYSCALL3(int, msync, void*, addr, size_t, length, int, flags)
         return DO_STATUS(EINVAL);
     }
 
-    int status =
-      mem_msync(VMS_SELF, &__current->mm.regions, addr, length, flags);
+    int status = mem_msync(VMS_SELF,
+                           (vm_regions_t*)&__current->mm.regions,
+                           (ptr_t)addr,
+                           length,
+                           flags);
 
     return DO_STATUS(status);
 }
\ No newline at end of file