From 2fd712d092465aaae7c25ec8734a75e8af87c470 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Sat, 16 Jul 2022 03:12:24 +0200
Subject: [PATCH] CPU changes.

---
 src/cpu/386_common.c | 34 ++++++++++++++++++++++++++++++++--
 src/cpu/cpu.h        |  4 ++++
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/src/cpu/386_common.c b/src/cpu/386_common.c
index 1f5bfe3b5..d7544b351 100644
--- a/src/cpu/386_common.c
+++ b/src/cpu/386_common.c
@@ -22,6 +22,7 @@
 #include <86box/fdd.h>
 #include <86box/fdc.h>
 #include <86box/keyboard.h>
+#include <86box/timer.h>
 #include "386_common.h"
 #include "x86_flags.h"
 #include "x86seg.h"
@@ -71,6 +72,9 @@ int smm_in_hlt = 0, smi_block = 0;
 uint32_t addr64, addr64_2;
 uint32_t addr64a[8], addr64a_2[8];
 
+static timer_t *cpu_fast_off_timer = NULL;
+static double *cpu_fast_off_period = NULL;
+
 
 #define AMD_SYSCALL_EIP	(msr.star & 0xFFFFFFFF)
 #define AMD_SYSCALL_SB	((msr.star >> 32) & 0xFFFF)
@@ -1837,11 +1841,37 @@ sysret(uint32_t fetchdat)
 }
 
 
+void
+cpu_register_fast_off_handler(void *timer, double *period)
+{
+    cpu_fast_off_timer = (timer_t *) timer;
+    cpu_fast_off_period = period;
+}
+
+
+void
+cpu_fast_off_advance(void)
+{
+    if (cpu_fast_off_period && (*cpu_fast_off_period != 0.0))
+	timer_on_auto(cpu_fast_off_timer, *cpu_fast_off_period);
+}
+
+
+void
+cpu_fast_off_period_set(uint16_t val, double period)
+{
+    if (cpu_fast_off_period) {
+	*cpu_fast_off_period = ((double) (val + 1)) * period;
+	cpu_fast_off_advance();
+    }
+}
+
+
 void
 smi_raise(void)
 {
     if (is486 && (cpu_fast_off_flags & 0x80000000))
-	cpu_fast_off_count = cpu_fast_off_val + 1;
+	cpu_fast_off_advance();
 
     smi_line = 1;
 }
@@ -1851,7 +1881,7 @@ void
 nmi_raise(void)
 {
     if (is486 && (cpu_fast_off_flags & 0x20000000))
-	cpu_fast_off_count = cpu_fast_off_val + 1;
+	cpu_fast_off_advance();
 }
 
 
diff --git a/src/cpu/cpu.h b/src/cpu/cpu.h
index 136a6c834..61fd700d9 100644
--- a/src/cpu/cpu.h
+++ b/src/cpu/cpu.h
@@ -733,6 +733,10 @@ extern uint8_t	do_translate, do_translate2;
 
 extern void	reset_808x(int hard);
 
+extern void	cpu_register_fast_off_handler(void *timer, double *period);
+extern void	cpu_fast_off_advance(void);
+extern void	cpu_fast_off_period_set(uint16_t vla, double period);
+
 extern void	smi_raise();
 extern void	nmi_raise();