Record networking and DMA development progress

Add the current OS source tree, build scripts, system image layout, and development notes covering DMA page allocation, e1000 bring-up, net API dispatch, and DHCP work in progress.
2026-07-02 16:17:09 +08:00
parent fbc14631e3
commit f1a2a110d7
182 changed files with 16472 additions and 0 deletions
@@ -0,0 +1,29 @@
+#include <utsm/capability.h>
+#include <utsm/segment.h>
+
+int utsm_cap_validate(utsm_capability cap, u32 required_rights, u64 offset, u64 len, utsm_segment_desc **out_desc) {
+    utsm_segment_desc *desc = utsm_get_segment(cap.segment_slot);
+    if (!desc) {
+        return UTSM_ERR_INVALID;
+    }
+    if (desc->state == UTSM_SEG_POISONED) {
+        return UTSM_ERR_POISONED;
+    }
+    if (desc->state != UTSM_SEG_ACTIVE) {
+        return UTSM_ERR_STATE;
+    }
+    if (desc->generation != cap.generation) {
+        return UTSM_ERR_STALE_CAP;
+    }
+    if ((cap.rights & required_rights) != required_rights) {
+        return UTSM_ERR_ACCESS;
+    }
+    if ((u32)desc->key_epoch != cap.epoch) {
+        return UTSM_ERR_EPOCH;
+    }
+    if (offset > desc->cipher_length || len > desc->cipher_length || offset + len > desc->cipher_length) {
+        return UTSM_ERR_BOUNDS;
+    }
+    *out_desc = desc;
+    return UTSM_OK;
+}