From 44a73ecab6e91519627786a5101cd4f1a2f2b0d7 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Wed, 30 Oct 2024 00:57:33 +0200
Subject: most of the way to passing tests

---
 src/vmem.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'src/vmem.c')

diff --git a/src/vmem.c b/src/vmem.c
index f4f1bf7..bd0cd7c 100644
--- a/src/vmem.c
+++ b/src/vmem.c
@@ -9,6 +9,7 @@
 #include <kmi/regions.h>
 #include <kmi/assert.h>
 #include <kmi/string.h>
+#include <kmi/panic.h>
 #include <kmi/debug.h>
 #include <kmi/bits.h>
 #include <kmi/vmem.h>
@@ -408,3 +409,25 @@ vmflags_t sanitize_uvflags(vmflags_t flags)
 {
 	return (flags & (VM_R | VM_W | VM_X)) | VM_V | VM_U;
 }
+
+void handle_pagefault(vm_t addr)
+{
+	struct tcb *t = cur_tcb();
+	struct tcb *p = get_cproc(t);
+
+	size_t ref = __page(addr);
+
+	struct mem_region *m = find_closest_used_region(&p->uvmem.region, addr);
+	if (!m || (ref < m->start || ref > m->end) || !is_region_used(m)) {
+		error("cannot handle actual page fault just yet :(\n");
+		kernel_panic(NULL, NULL, 0);
+		return;
+	}
+
+	/* this is a valid address so presumably the proc virtual memory has
+	 * some changes that haven't been reflected over in our rpc virtual
+	 * memory so make them visible */
+	clone_uvmem(p->proc.vmem, t->rpc.vmem);
+	flush_tlb_all();
+	return;
+}
-- 
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