add memory region object for better memory managment

1 files changed, 68 insertions, 0 deletions

diff --git a/sys/syscall_region.c b/sys/syscall_region.c
new file mode 100644
index 0000000..959d615
--- /dev/null
+++ b/sys/syscall_region.c
@@ -0,0 +1,68 @@
+#include "api/error.h"
+#include "api/syscall.h"
+#include "hal/memory.h"
+#include "lib/printf.h"
+#include "jove.h"
+#include "syscall.h"
+
+static int
+s_syscall_region_alloc(jove_owned_obj_t *region_obj,
+                       jove_owned_obj_t *objdir_obj,
+                       lockstack_t *lockstack,
+                       size_t bytes_left,
+                       void *payload_data)
+{
+    size_t bytes_needed = sizeof(struct syscall_region_alloc);
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for payload");
+
+    struct syscall_region_alloc *payload = payload_data;
+    bytes_needed += payload->dest_pathlen * sizeof(objpath_part_t);
+
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for subject path");
+
+    jove_perm_obj_t subject = link_try_traverse_objdir(
+        objdir_obj, lockstack, payload->dest_pathlen, payload->dest_path);
+    CHECK_OBJEXISTS(subject.obj, "Destination path is bad.");
+    CHECK_OBJPERM(subject, SYSCALL_PERM_REGION_ALLOC_TGT, "Destination path does not have correct permissions.");
+    CHECK_OBJTYPE(subject.obj, JOVE_OBJ_NONE, "Destination object is not JOVE_OBJ_NONE");
+
+    int sysret = 0;
+    if(payload->alloc_pages == 1) {
+        sysret = region_alloc(region_obj, subject.obj);
+    }else{
+        sysret = region_alloc_contig(region_obj, subject.obj, payload->alloc_pages);
+    }
+    if(sysret < 0) {
+        klogf("Region alloc failed with reason: %s\n", errstr(-sysret));
+    }
+    return sysret;
+}
+
+int 
+_syscall_handle_region(syscall_context_t *ctx)
+{
+    switch(ctx->header->callid) {
+        case SYSCALL_REGION_ADDRESS:
+            if(ctx->target.permissions & SYSCALL_PERM_REGION_GETTERS)
+                return region_base(ctx->target.obj);
+            return -EPERM;
+
+        case SYSCALL_REGION_TOTAL_PAGES:
+            if(ctx->target.permissions & SYSCALL_PERM_REGION_GETTERS)
+                return region_pages(ctx->target.obj);
+            return -EPERM;
+
+        case SYSCALL_REGION_FREE_PAGES:
+            if(ctx->target.permissions & SYSCALL_PERM_REGION_GETTERS)
+                return region_freepages(ctx->target.obj);
+            return -EPERM;
+
+        case SYSCALL_REGION_ALLOC:
+            if(ctx->target.permissions & SYSCALL_PERM_REGION_ALLOC)
+                return s_syscall_region_alloc(ctx->target.obj, ctx->objdir, &ctx->lockstack, ctx->bytes_left, ctx->payload);
+            return -EPERM;
+
+        default:
+            return -EBADCALL;
+    }
+}