From 548506392b789f58b1556a6ffca917441e1d89fd Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 13 Oct 2026 22:31:43 -0400
Subject: ipc functions. work on process spawning

---
 sys/message.c | 96 ++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 68 insertions(+), 28 deletions(-)

(limited to 'sys/message.c')

diff --git a/sys/message.c b/sys/message.c
index c87487b..c4414e0 100644
--- a/sys/message.c
+++ b/sys/message.c
@@ -1,54 +1,94 @@
 #include "message.h"
 #include "api/error.h"
-#include "errno.h"
+#include "jove.h"
 #include "hal/memory.h"
 #include "hal/obj.h"
 #include "lib/printf.h"
 
-int
-message_hasmap(jove_owned_obj_t *obj)
+static inline uintptr_t
+s_message_addr(jove_owned_obj_t *message_obj)
+{
+    return (obj_getvalue(message_obj) >> 1) << 12;
+}
+
+int message_new(jove_owned_obj_t *untyped_obj)
+{
+    uintmax_t untyped_value = obj_getvalue(untyped_obj);
+    jove_untyped_t *untyped = obj_deref(untyped_obj);
+    if(untyped->limit != 0x1000) {
+        klogf("Passed untyped has bad size : %x vs %x\n", untyped->limit, MESSAGE_SIZE);
+        return -EBADSIZE;
+    }
+    if(untyped_value & (MESSAGE_ALIGN - 1)) {
+        klogf("Passed untyped has bad alignment : %x\n", untyped_value & (MESSAGE_ALIGN - 1));
+        return -EALIGN;
+    }
+
+    obj_settype(untyped_obj, JOVE_OBJ_MESSAGE);
+    obj_setvalue(untyped_obj, obj_getvalue(untyped_obj) >> 11);
+    return 0;
+}
+
+inline int
+message_hasmap(jove_owned_obj_t *message_obj)
 {
-    return obj_getvalue(obj) & 1;
+    return obj_getvalue(message_obj) & 1;
 }
 
-uintptr_t
-message_unmap(jove_owned_obj_t *obj, jove_owned_obj_t *pagedir)
+virtaddr_t
+message_unmap(jove_owned_obj_t *message_obj, jove_owned_obj_t *pagedir_obj)
 {
-    if(message_hasmap(obj) == 0) {
-        kprintf("Message %p doesn't have a map\n", obj_getvalue(obj));
-        return -ENOMAP;
+    errno = 0;
+    if(message_hasmap(message_obj) == 0) {
+        klogf("Message %p doesn't have a map\n", obj_getvalue(message_obj));
+        errno = -ENOMAP;
+        return 0;
     }
-    uintptr_t vptr = obj->locked.value & ~0xFFFULL;
-    uintptr_t *mapping = pagedir_get_mapping(pagedir, vptr);
+
+    virtaddr_t message_vaddr = s_message_addr(message_obj);
+    virtaddr_t *mapping = pagedir_get_mapping(pagedir_obj, message_vaddr);
+    physaddr_t message_pfn = pagedir_mapping_get_pfn(mapping);
 
     pagedir_mapping_set_present(mapping, false);
-    pagedir_invlpg(vptr);
+    obj_setvalue(message_obj, message_pfn << 1);
+    pagedir_invlpg(message_vaddr);
+    message_klogf("Unmapped message %p from %p\n", message_pfn << 12, message_vaddr);
 
-    obj_setvalue(obj, *mapping);
-    return vptr;
+    return message_vaddr;
 }
 
-void 
-message_remap(jove_owned_obj_t *message, jove_owned_obj_t *pagedir, uintptr_t vptr)
+int
+message_map(jove_owned_obj_t *message, jove_owned_obj_t *pagedir, virtaddr_t vaddr)
 {
     if(message_hasmap(message)) {
-        errno = -EHASMAP;
-        return;
+        return -EHASMAP;
     }
 
-    uintmax_t *mapping = pagedir_get_mapping(pagedir, vptr);
+    virtaddr_t message_paddr = s_message_addr(message);
+    virtaddr_t *mapping = pagedir_get_mapping(pagedir, vaddr);
 
-    *mapping = obj_getvalue(message) | 1;
-    pagedir_invlpg(vptr);
+    if(pagedir_mapping_is_present(mapping)) {
+        klogf("Mapping %p is occupied\n",
+                mapping, message);
+        return -EHASMAP;
+    }
+
+    pagedir_mapping_set_pfn(mapping, message_paddr >> 12);
+    pagedir_mapping_set_present(mapping, true);
+    pagedir_mapping_set_writeable(mapping, true);
+    pagedir_mapping_set_user(mapping, true);
+    pagedir_mapping_set_type(mapping, JOVE_MAPPING_TYPE_MESSAGE);
 
-    obj_setvalue(message, vptr | 1);
+    pagedir_invlpg(vaddr);
+
+    message_klogf("Mapped message %p to %p\n", message_paddr, vaddr);
+    obj_setvalue(message, (vaddr >> 11) | 1);
+    return 0;
 }
 
-uintptr_t message_getdata(jove_owned_obj_t *message)
+virtaddr_t message_getdata(jove_owned_obj_t *message)
 {
-    if(message_hasmap(message))
-        return obj_getvalue(message) & ~0xFFFULL;
-
-    uintptr_t message_val = obj_getvalue(message);
-    return pagedir_ident_from_mapping(&message_val);
+    uintptr_t message_addr = s_message_addr(message);
+    if(message_hasmap(message)) return message_addr;
+    return (virtaddr_t)phys_tovirt(message_addr);
 }
-- 
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