From 3229549f42030fd3eceeaaf0a054cf9328f252a1 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Wed, 26 Oct 2022 08:00:42 +0200
Subject: Add -extirq option to support simulating the UT700

---
 gr740.c | 3 ++-
 grlib.c | 7 +++++--
 grlib.h | 1 -
 help.c  | 3 ++-
 leon3.c | 5 +++--
 sis.c   | 5 +++++
 sis.h   | 1 +
 7 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/gr740.c b/gr740.c
index 7840ed2..75340de 100644
--- a/gr740.c
+++ b/gr740.c
@@ -56,7 +56,8 @@ init_sim (void)
 {
   int i;
 
-  irqmp_extirq = 10;
+  if (irqmp_extirq < 0)
+    irqmp_extirq = 10;
 
   for (i = 0; i < NCPU; i++)
     grlib_ahbm_add (&leon3s, 0);
diff --git a/grlib.c b/grlib.c
index 1e03d26..c2d2acf 100644
--- a/grlib.c
+++ b/grlib.c
@@ -409,8 +409,11 @@ static uint32 irqmp_pextack[NCPU];
 /* Mask with the supported interrupts */
 static uint32 irqmp_mask;
 
-/* The extended interrupt line (a zero value disables the feature) */
-int irqmp_extirq;
+/*
+ * This is the extended interrupt line (a zero value disables the feature;
+ * if -1 use the default value of the CPU).
+ */
+int irqmp_extirq = -1;
 
 static void
 irqmp_init (void)
diff --git a/grlib.h b/grlib.h
index 036a93d..b182884 100644
--- a/grlib.h
+++ b/grlib.h
@@ -106,4 +106,3 @@ extern void apbuart_close_port (void);
 extern void apbuart_flush (void);
 extern const struct grlib_ipcore gptimer, irqmp, apbuart, apbmst,
   greth, l2c, leon3s, srctrl, ns16550, clint, plic, sdctrl, s5test;
-extern int irqmp_extirq;
diff --git a/help.c b/help.c
index 4db2479..be7826f 100644
--- a/help.c
+++ b/help.c
@@ -26,9 +26,10 @@ sis_usage ()
 
   printf ("usage: sis [-uart1 uart_device1] [-uart2 uart_device2]\n");
   printf ("[-m <n>] [-dumbio] [-gdb] [-port port]\n");
+  printf ("[-nouartrx] [-extirq number]\n");
   printf ("[-cov] [-nfp] [-ift] [-wrp] [-rom8] [-uben]\n");
   printf ("[-freq frequency] [-c batch_file]\n");
-  printf ("[-erc32] [-leon2] [-leon3] [-griscv] [-rv32]\n");
+  printf ("[-erc32] [-leon2] [-leon3] [-gr740] [-griscv] [-rv32]\n");
   printf ("[-d] [-v] [-rt] [-bridge name] [files]\n");
 }
 
diff --git a/leon3.c b/leon3.c
index 3a66d1e..d833689 100644
--- a/leon3.c
+++ b/leon3.c
@@ -56,8 +56,9 @@ init_sim (void)
 {
   int i;
 
-  /* Use extended interrupt line of GR712RC */
-  irqmp_extirq = 12;
+  /* Use extended interrupt line of GR712RC by default */
+  if (irqmp_extirq < 0)
+    irqmp_extirq = 12;
 
   for (i = 0; i < ncpu; i++)
     grlib_ahbm_add (&leon3s, 0);
diff --git a/sis.c b/sis.c
index 580eb64..cf59c71 100644
--- a/sis.c
+++ b/sis.c
@@ -147,6 +147,11 @@ main (argc, argv)
 	    {
 	      nouartrx = 1;
 	    }
+	  else if (strcmp (argv[stat], "-extirq") == 0)
+	    {
+	      if ((stat + 1) < argc)
+		irqmp_extirq = VAL (argv[++stat]);
+	    }
 	  else if (strcmp (argv[stat], "-r") == 0)
 	    {
 	      run = 1;
diff --git a/sis.h b/sis.h
index a357fb2..f60d9be 100644
--- a/sis.h
+++ b/sis.h
@@ -305,6 +305,7 @@ extern void sys_halt (void);
 extern int elf_load (char *fname, int load);
 extern double get_time (void);
 extern int nouartrx;
+extern int irqmp_extirq;
 //extern                host_callback *sim_callback;
 extern int dumbio;
 extern int tty_setup;
-- 
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