From 858a52c06a4615bd58a6a906333f2ad707d41c0a Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 19 Aug 2025 15:04:04 -0400
Subject: usermode pager

---
 lib/libjove/arch/x86_64/object/directory.c |  15 +++++
 lib/libjove/arch/x86_64/object/pagemap.c   | 105 +++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 lib/libjove/arch/x86_64/object/directory.c
 create mode 100644 lib/libjove/arch/x86_64/object/pagemap.c

(limited to 'lib/libjove/arch/x86_64/object')

diff --git a/lib/libjove/arch/x86_64/object/directory.c b/lib/libjove/arch/x86_64/object/directory.c
new file mode 100644
index 0000000..01f57c4
--- /dev/null
+++ b/lib/libjove/arch/x86_64/object/directory.c
@@ -0,0 +1,15 @@
+#include <object.h>
+#include <arch/x86_64/object-pagemap.h>
+
+JoveError
+_jove_objdir_sync_at_arch(KernelObjectDirectory *dir, uint8_t i, obj_type_t type, KernelObjectTyped **memb)
+{
+    KernelObjectTyped *dirmemb = NULL;
+    switch(type) {
+        case KO_MEMORY_MAPPING:
+            dirmemb = JOVE_OBJECT_TYPED(_jove_alloc_pagemap(dir, i));
+            if(memb) *memb = dirmemb;
+            break;
+    }
+    return EJOVE_OK;
+}
diff --git a/lib/libjove/arch/x86_64/object/pagemap.c b/lib/libjove/arch/x86_64/object/pagemap.c
new file mode 100644
index 0000000..c58d7c6
--- /dev/null
+++ b/lib/libjove/arch/x86_64/object/pagemap.c
@@ -0,0 +1,105 @@
+#include <object.h>
+#include <jove.h>
+#include <error.h>
+#include <kernel/error.h>
+#include <string.h>
+#include <arch/x86_64/object-pagemap.h>
+#include <arch/x86_64/syscall.h>
+
+KernelObjectPageMap*
+jove_object_as_pagemap(KernelObjectTyped *typed)
+{
+    if(typed->type == KO_MEMORY_MAPPING) return (KernelObjectPageMap*)typed;
+    jove_errno = EJOVE_BADOBJ;
+    return NULL;
+}
+
+void 
+_jove_alloc_pagemap_inplace(
+        KernelObjectPageMap *pagemap,
+        KernelObjectDirectory *dir,
+        uint8_t memb)
+{
+    *pagemap = (KernelObjectPageMap) {
+        .typed = (KernelObjectTyped) {
+            .parent = dir,
+            .type = KO_MEMORY_MAPPING,
+            .membi = memb
+        },
+    };
+    dir->children[memb] = JOVE_OBJECT_TYPED(pagemap);
+}
+
+KernelObjectPageMap* 
+_jove_alloc_pagemap(
+        KernelObjectDirectory *dir, 
+        uint8_t memb)
+{
+    if(_jove_alloc == NULL) {
+        jove_errno = EJOVE_NOALLOC;
+        return NULL;
+    }
+    if(dir->children[memb] != NULL) {
+        jove_errno = EJOVE_FULL;
+        return NULL;
+    }
+
+    KernelObjectPageMap *pagemap = _jove_alloc(sizeof(KernelObjectPageMap));
+    if(pagemap == NULL) return NULL;
+
+    _jove_alloc_pagemap_inplace(pagemap, dir, memb);
+    jove_errno = EJOVE_OK;
+    return pagemap;
+}
+
+int
+jove_pagemap_exists(
+        KernelObjectPageMap *map,
+        uint8_t depth,
+        uint16_t *path
+        )
+{
+    if(!_jove_alloc) {
+        jove_errno = EJOVE_NOALLOC;
+        return 0;
+    }
+    int kerr = _syscall_invoke_mapping_exists(map, depth, path);
+    if(kerr == KE_DNE) return 0;
+
+    int jerr = jove_error_from_kerror(kerr);
+
+    if(jerr) {
+        jove_errno = jerr;
+        return 0;
+    }
+    return 1;
+}
+
+JoveError
+jove_pagemap_map(
+        KernelObjectPageMap *map,
+        uint8_t depth,
+        uint16_t *path,
+        KernelObjectUntyped *untyped)
+{
+    if(jove_untyped_size(untyped) != 0x1000) {
+        return EJOVE_BADSIZE;
+    }
+
+    return jove_error_from_kerror(_syscall_invoke_mapping_map(map, depth, path, untyped));
+}
+
+JoveError
+jove_pagemap_unmap(
+        KernelObjectPageMap *map,
+        uint8_t depth,
+        uint16_t *path,
+        KernelObjectUntyped *untyped)
+{
+    JoveError err = jove_error_from_kerror(_syscall_invoke_mapping_unmap(map, depth, path, untyped));
+    if(err) return err;
+
+    untyped->alignment = 0x1000;
+    untyped->bytes = 0x1000;
+    return EJOVE_OK;
+}
-- 
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