From 79822e485edb7b447ab8cb17fdc0f572b598d829 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 17 Sep 2025 21:20:29 -0400
Subject: kern/amd64: Implement syscall domains and windows

A syscall domain in the L5 kernel is a fixed list of "syscall windows",
each syscall window represents a specific platform and/or syscall model.
A platform latch within each domain determines which window / platform
should be visible. Since syscall domains are per-process, these changes
are local to their respective processes.

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/os/os_proc.c    | 19 +++++++++++++++++++
 src/sys/os/os_syscall.c |  9 +++------
 2 files changed, 22 insertions(+), 6 deletions(-)

(limited to 'src/sys/os')

diff --git a/src/sys/os/os_proc.c b/src/sys/os/os_proc.c
index 6880dda..329a3ea 100644
--- a/src/sys/os/os_proc.c
+++ b/src/sys/os/os_proc.c
@@ -41,13 +41,32 @@ static pid_t next_pid = 0;
 int
 proc_init(struct proc *procp, int flags)
 {
+    struct syscall_domain *scdp;
+    struct syscall_win *winp;
     int error;
 
     if (procp == NULL) {
         return -EINVAL;
     }
 
+    /* Put the process in a known state */
+    scdp = &procp->scdom;
     memset(procp, 0, sizeof(*procp));
+
+    /*
+     * Initialize each platform latch
+     */
+    for (platch_t p = 0; p < __SC_PLATCH_MAX; ++p) {
+        winp = &scdp->slots[p];
+        switch (p) {
+        case SC_PLATCH_UNIX:
+            winp->p = 1;
+            winp->sctab = &g_unix_sctab[0];
+            winp->nimpl = UNIX_SCTAB_LEN;
+            break;
+        }
+    }
+
     procp->pid = atomic_inc_int(&next_pid);
     error = md_proc_init(procp, flags);
     return error;
diff --git a/src/sys/os/os_syscall.c b/src/sys/os/os_syscall.c
index 060f774..782bfb4 100644
--- a/src/sys/os/os_syscall.c
+++ b/src/sys/os/os_syscall.c
@@ -31,10 +31,7 @@
 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/proc.h>
+#define _NEED_UNIX_SCTAB
+#include <compat/unix/syscall.h>
 
-scret_t(*g_sctab[])(struct syscall_args *) = {
-    [SYS_none]   = NULL,
-    [SYS_exit]   = sys_exit
-};
-
-const size_t MAX_SYSCALLS = NELEM(g_sctab);
+const size_t UNIX_SCTAB_LEN = NELEM(g_unix_sctab);
-- 
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