From 6668e412cc683d692f5a3b4667b94e87ec357517 Mon Sep 17 00:00:00 2001
From: Eggert Jung <eggert.s.jung@wischhof13.de>
Date: Sat, 28 Feb 2026 23:44:10 +0100
Subject: [PATCH] wip multipage ipc send/recv

---
 kernel/syscall/skeleton.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/syscall/skeleton.cc b/kernel/syscall/skeleton.cc
index d8708ac..7cd8b02 100644
--- a/kernel/syscall/skeleton.cc
+++ b/kernel/syscall/skeleton.cc
@@ -247,11 +247,13 @@ int receive(Vault& v, void* buffer, size_t size) {
 	if (ipc == nullptr) return -1;
 	
     size_t copy_len = (size < ipc->size) ? size:ipc->size;
-	// Buffer holen
+    size_t total_len = (Page::offset(ipc->ptr)+copy_len);
+    uint8_t num_pages = (total_len/4096)+1;
     
-    for(uint32_t i=0; i<(copy_len/4096)+1; i++){
+    for(uint32_t i=0; i<num_pages; i++){
+        uintptr_t offset = i==0?Page::offset(ipc->ptr):0; //apply offset only on first page
         uintptr_t paddr = isMapped((ipc->ptr)+(i*4096), v.thread_list[ipc->pid]->paging_tree->l4);
-        if (!copy_from_phys(v, paddr, buffer, copy_len)) {
+        if (!copy_from_phys(v, paddr+offset, buffer, 4096-offset)) {
             return -3;
         }
     }