From 42904782f797145916ddf30bee30f01a3b073f23 Mon Sep 17 00:00:00 2001
From: Michel Heily <michelheily@gmail.com>
Date: Thu, 21 Nov 2019 17:33:08 +0200
Subject: [PATCH] Fix bios infinite loop caused by changes in
 f5a8ca8de8a5b007ace879f50fb97ead3e976347 [formerly
 e885e9ff1393dd14f5e4132c71a7641d658399cb]

This commit removed the dummy iomem buffer, and the bios busy waits on
REG_SOUNDBIAS in order to proceed.


Former-commit-id: 1fb8e2b621bed22da55781adcaae748aaaf845b9
---
 src/core/iodev.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/core/iodev.rs b/src/core/iodev.rs
index 35c55ae..41dae65 100644
--- a/src/core/iodev.rs
+++ b/src/core/iodev.rs
@@ -26,6 +26,7 @@ pub struct IoDevices {
     pub post_boot_flag: bool,
     pub waitcnt: WaitControl, // TODO also implement 4000800
     pub haltcnt: HaltState,
+    pub sound_bias: u16,
 
     mem: BoxedMemory,
 }
@@ -42,6 +43,7 @@ impl IoDevices {
             haltcnt: HaltState::Running,
             keyinput: keypad::KEYINPUT_ALL_RELEASED,
             waitcnt: WaitControl(0),
+            sound_bias: 0x200,
         }
     }
 }
@@ -96,6 +98,8 @@ impl Bus for IoDevices {
             REG_DMA2CNT_H => io.dmac.channels[2].ctrl.0,
             REG_DMA3CNT_H => io.dmac.channels[3].ctrl.0,
 
+            REG_SOUNDBIAS => io.sound_bias,
+
             REG_WAITCNT => io.waitcnt.0,
 
             REG_POSTFLG => io.post_boot_flag as u16,
@@ -234,6 +238,8 @@ impl Bus for IoDevices {
                 io.dmac.write_16(channel_id, ofs % 12, value)
             }
 
+            REG_SOUNDBIAS => io.sound_bias = value & 0xc3fe,
+
             REG_WAITCNT => io.waitcnt.0 = value,
 
             REG_POSTFLG => io.post_boot_flag = value != 0,