From 465cba0c00bfc5d89bf10ce353b0adf40bdc098d Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Sat, 3 Oct 2026 21:32:29 -0400
Subject: unmap message object used for syscalls

---
 arch/x86_64/hal/obj.c    |  2 +-
 arch/x86_64/hal/paging.c | 36 ++++++++++++++++++++++++++++++++----
 2 files changed, 33 insertions(+), 5 deletions(-)

(limited to 'arch/x86_64/hal')

diff --git a/arch/x86_64/hal/obj.c b/arch/x86_64/hal/obj.c
index 103b53d..75cb0c0 100644
--- a/arch/x86_64/hal/obj.c
+++ b/arch/x86_64/hal/obj.c
@@ -41,7 +41,7 @@ obj_release(jove_owned_obj_t *obj)
 void*
 obj_deref(jove_owned_obj_t *obj)
 {
-    return (void*)(((uintptr_t)obj_getvalue(obj)) | 0xFFFF800000000000ULL);
+    return (void*)(((uintptr_t)obj_getvalue(obj)) | IDENT_VIRT_BASE);
 }
 
 uint8_t
diff --git a/arch/x86_64/hal/paging.c b/arch/x86_64/hal/paging.c
index 770cdff..408b5d5 100644
--- a/arch/x86_64/hal/paging.c
+++ b/arch/x86_64/hal/paging.c
@@ -42,6 +42,11 @@ paging_pml4_switch(uintptr_t pml4)
     __asm__ volatile("movq %0, %%cr3":: "r"(pml4): "memory");
 }
 
+void pagedir_invlpg(uintptr_t vptr)
+{
+    __asm__ volatile("invlpg (%0)":: "r"(vptr));
+}
+
 static struct int_stackframe*
 s_int_handle_pf_early(struct int_stackframe *frame)
 {
@@ -101,6 +106,29 @@ s_pagedir_get_pml1(page_t *pml4, uintptr_t vptr)
     return PML_TBL(pml2, pml2i);
 }
 
+uintptr_t *pagedir_get_mapping(jove_owned_obj_t *pagedir, uintptr_t vptr)
+{
+    page_t *pml4 = obj_deref(pagedir);
+    page_t *pml1 = s_pagedir_get_pml1(pml4, vptr);
+    if(!pml1) return 0;
+
+    size_t pml1i = PML1I(vptr);
+    page_t *mapping = &pml1[pml1i];
+    return (uintptr_t*)mapping;
+}
+
+uintptr_t 
+pagedir_ident_from_mapping(uintptr_t *mapping)
+{
+    return (((page_t*)mapping)->paddr << 12) | IDENT_VIRT_BASE;
+}
+
+void 
+pagedir_mapping_set_present(uintptr_t *mapping, bool present)
+{
+    ((page_t*)mapping)->p = present;
+}
+
 int pagedir_map_frame(page_t *pml4, 
         uintptr_t pptr, uintptr_t vptr,
         uintmax_t flg)
@@ -113,7 +141,7 @@ int pagedir_map_frame(page_t *pml4,
     if(pml1[pml1i].p) return EEXIST;
 
     pml1[pml1i].value = pptr | PAGE_PRESENT | flg;
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
     return 0;
 }
 
@@ -184,7 +212,7 @@ map_table:
         PAGE_PRESENT |
         (pptr > IDENT_VIRT_BASE ? 0 : PAGE_USER) |
         PAGE_WRITEABLE;
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
     return 0;
 }
 
@@ -241,7 +269,7 @@ int pagedir_unmap_untyped_frame(
 
     jove_untyped_t *untyped_data = obj_deref(dst);
     untyped_data->limit = 0x1000;
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
 
     return 0;
 }
@@ -295,7 +323,7 @@ unmap_table:
     jove_untyped_t *untyped = obj_deref(dst);
     untyped->limit = 0x1000;
 
-    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");
+    pagedir_invlpg(vptr);
     return 0;
 }
 }
-- 
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