From 3d99d2fbd600091a3dec0697e35dddfca17621ab Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 25 Mar 2025 10:24:49 -0400
Subject: kernel: vm: Add initial mmap() impl

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_fork.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'sys/kern')

diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 6feeee2..abb7707 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -27,6 +27,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <sys/mman.h>
+#include <sys/tree.h>
 #include <sys/types.h>
 #include <sys/proc.h>
 #include <sys/errno.h>
@@ -49,12 +51,17 @@ int
 fork1(struct proc *cur, int flags, void(*ip)(void), struct proc **newprocp)
 {
     struct proc *newproc;
+    struct mmap_lgdr *mlgdr;
     int status = 0;
 
     newproc = dynalloc(sizeof(*newproc));
     if (newproc == NULL)
         return -ENOMEM;
 
+    mlgdr = dynalloc(sizeof(*mlgdr));
+    if (mlgdr == NULL)
+        return -ENOMEM;
+
     memset(newproc, 0, sizeof(*newproc));
     status = md_fork(newproc, cur, (uintptr_t)ip);
     if (status != 0)
@@ -64,6 +71,11 @@ fork1(struct proc *cur, int flags, void(*ip)(void), struct proc **newprocp)
     if (newprocp != NULL)
         *newprocp = newproc;
 
+    /* Initialize the mmap ledger */
+    mlgdr->nbytes = 0;
+    RBT_INIT(lgdr_entries, &mlgdr->hd);
+    newproc->mlgdr = mlgdr;
+
     newproc->pid = ++nthreads;
     signals_init(newproc);
     sched_enqueue_td(newproc);
-- 
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