From 7ed280f42f18cdcb32633690918a661f47665d72 Mon Sep 17 00:00:00 2001
From: sparky4 <sparky4@lappy4.4ch.mooo.com>
Date: Tue, 20 Jan 2015 20:35:19 -0600
Subject: [PATCH] found ems library 	new file:   src/lib/ems1.c

---
 src/lib/ems1.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 src/lib/ems1.c

diff --git a/src/lib/ems1.c b/src/lib/ems1.c
new file mode 100644
index 00000000..dd9ebe53
--- /dev/null
+++ b/src/lib/ems1.c
@@ -0,0 +1,110 @@
+#if !defined(__EMS_H)
+#define __EMS_H
+
+#define EMSPAGESIZE (4096)
+#define EMS_ERROR (-1)
+struct {
+  unsigned long length;
+  unsigned char source_type;
+  unsigned int source_handle;
+  unsigned int source_ofs; 
+  unsigned int source_seg;
+  unsigned char dest_type;
+  unsigned int dest_handle;
+  unsigned int dest_ofs; 
+  unsigned int dest_seg;
+} myEMSmove;
+
+
+void conv2ems(int PAGE, int HANDLE, char *output) {
+      char *x = (char *) &myEMSmove;
+      myEMSmove.length = EMSPAGESIZE;
+      myEMSmove.source_type = 0;
+      myEMSmove.source_handle = 0;
+      myEMSmove.source_ofs = FP_OFF(output);
+      myEMSmove.source_seg = FP_SEG(output);
+      myEMSmove.dest_type = 1;
+      myEMSmove.dest_handle = HANDLE;
+      myEMSmove.dest_ofs = (PAGE & 3) << 12;
+      myEMSmove.dest_seg = PAGE >> 2;
+      __asm push ds
+      __asm mov       ax, 5700h;        
+      __asm lds       si, x
+      __asm int       67h 
+      __asm pop ds
+}
+
+void ems2conv(int PAGE, int HANDLE, char *output) {
+      char *x = (char *) &myEMSmove;
+      myEMSmove.length = EMSPAGESIZE;
+      myEMSmove.source_type = 1;
+      myEMSmove.source_handle = HANDLE;
+      myEMSmove.source_ofs = (PAGE & 3) << 12;
+      myEMSmove.source_seg = PAGE>>2;
+      myEMSmove.dest_type = 0;
+      myEMSmove.dest_handle = 0;
+      myEMSmove.dest_ofs = FP_OFF(output);
+      myEMSmove.dest_seg = FP_SEG(output);
+      __asm push ds
+      __asm mov       ax, 5700h
+      __asm lds       si, x
+      __asm int       67h 
+      __asm pop ds
+}
+
+
+void freeEMS(int handle) {
+  __asm mov       dx, handle;
+  __asm mov       ah, 45h;    
+  __asm int       67h  
+}
+
+int checkEMS() {
+  char *x = "EMMXXXX0";
+  __asm {
+    mov ax, 3567h
+    int 21h
+    mov di, 10
+    mov si, offset x
+    mov cx, 4
+    rep cmpsw
+    je good 
+  }
+  return -1;
+  good:
+  __asm {
+    sub     ax, ax
+    mov     ah, 40h
+    int     67h
+  }
+  return _AX;
+}
+
+int getavailEMS() {
+  __asm {
+    mov     ah, 42h
+    int     67h
+    cmp     ah, 00h
+    je      getavailEMS_Okay
+    mov     bx, -1
+  }
+  getavailEMS_Okay:
+  __asm shl bx, 2
+  return _BX;
+}
+
+int allocEMS(int pages) {
+  __asm {
+    mov     bx, pages
+    shr     bx, 2
+    mov     ah, 43h
+    int     67h
+    cmp     ah, 0
+    je      allocEMS_Okay
+    mov     dx, -1
+  }
+  allocEMS_Okay:
+  return _DX;
+}
+
+#endif
-- 
2.39.2