From e4ad003bc77f16045013143da21277d53bf195f4 Mon Sep 17 00:00:00 2001
From: Kelvin Sherlock <ksherlock@gmail.com>
Date: Tue, 20 Jan 2015 14:07:38 -0500
Subject: [PATCH] SysEnvirons ($a090) OS Trap

---
 toolbox/os.h           |  1 +
 toolbox/os_gestalt.cpp | 57 ++++++++++++++++++++++++++++++++++++++++++
 toolbox/toolbox.cpp    |  6 ++++-
 3 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/toolbox/os.h b/toolbox/os.h
index 277a3d5..b041a09 100644
--- a/toolbox/os.h
+++ b/toolbox/os.h
@@ -99,6 +99,7 @@ namespace OS
 
 	#pragma mark - Gestalt Manager
 	uint16_t Gestalt(uint16_t trap);
+	uint16_t SysEnvirons(uint16_t trap);
 
 	#pragma mark - XP Ram
 	uint16_t ReadXPRam(uint16_t trap);
diff --git a/toolbox/os_gestalt.cpp b/toolbox/os_gestalt.cpp
index 00ba179..5d61717 100644
--- a/toolbox/os_gestalt.cpp
+++ b/toolbox/os_gestalt.cpp
@@ -46,6 +46,8 @@
 #include <cpu/CpuModule.h>
 #include <cpu/fmem.h>
 
+#include <macos/errors.h>
+
 #include "os.h"
 #include "os_internal.h"
 #include "toolbox.h"
@@ -96,5 +98,60 @@ namespace OS {
 		return 0;
 	}
 
+
+	uint16_t SysEnvirons(uint16_t trap)
+	{
+		//  FUNCTION SysEnvirons (versionRequested: Integer;
+		//                        VAR theWorld: SysEnvRec): OSErr;
+
+		/*
+		 * on entry:
+		 * D0 Version requested
+		 * A0 SysEnvRec pointer
+		 *
+		 * on exit:
+		 * D0 Result code
+		 *
+		 */
+
+		enum {
+			/* SysEnvRec */
+			_environsVersion = 0,
+			_machineType = 2,
+			_systemVersion = 4,
+			_processor = 6,
+			_hasFPU = 8,
+			_hasColorQD = 9,
+			_keyBoardType = 10,
+			_atDrvrVersNum = 12,
+			_sysVRefNum = 14,
+		};
+
+		uint16_t versionRequested = cpuGetDReg(0);
+		uint32_t theWorld = cpuGetAReg(0);
+
+		Log("%04x SysEnvirons(%04x, %08x)\n", trap, versionRequested, theWorld);
+
+		memoryWriteWord(2, theWorld + _environsVersion);
+
+		// negative version.
+		if (versionRequested >= 0x8000)
+			return MacOS::envBadVers;
+
+		if (versionRequested > 2)
+			return MacOS::envVersTooBig;
+
+		memoryWriteWord(0, theWorld + _machineType); // 0 = unknown model newer than the IIci (v1) or IIfx (v2)
+		memoryWriteWord(1 + cpuGetModelMajor(), theWorld + _processor);
+		memoryWriteWord(0x0700, theWorld + _systemVersion); // system 7
+		memoryWriteWord(0, theWorld + _hasFPU);
+		memoryWriteWord(0, theWorld + _hasColorQD);
+		memoryWriteWord(5, theWorld + _keyBoardType); // standard adb I guess
+		memoryWriteWord(0, theWorld + _atDrvrVersNum); // no appletalk
+		memoryWriteWord(-1, theWorld + _sysVRefNum); // System folder #
+
+		return 0;
+	}
+
 }
 
diff --git a/toolbox/toolbox.cpp b/toolbox/toolbox.cpp
index 5aa74df..4f42975 100644
--- a/toolbox/toolbox.cpp
+++ b/toolbox/toolbox.cpp
@@ -218,6 +218,10 @@ namespace ToolBox {
 				d0 = OS::Gestalt(trap);
 				break;
 
+			case 0xa090:
+				d0 = OS::SysEnvirons(trap);
+				break;
+
 			// SetPtrSize (p: Ptr; newSize: Size);
 			case 0xa020:
 				d0 = MM::SetPtrSize(trap);
@@ -793,4 +797,4 @@ namespace ToolBox {
 		return tmp;
 	}
 	#endif
-}
\ No newline at end of file
+}