2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
15 * $Source: /cvs/cvsroot/d2x/arch/dos_dpmi.c,v $
18 * $Date: 2001-01-29 13:35:08 $
22 * $Log: not supported by cvs2svn $
30 #define _BORLAND_DOS_REGS 1
32 #include <sys/segments.h>
33 #include <sys/nearptr.h>
35 #define FP_SEG(p) _my_ds()
36 #define FP_OFF(p) (int)p
37 int _crt0_startup_flags=_CRT0_FLAG_NONMOVE_SBRK+_CRT0_FLAG_FILL_SBRK_MEMORY+_CRT0_FLAG_FILL_DEADBEEF+_CRT0_FLAG_NEARPTR+_CRT0_FLAG_NO_LFN;
51 int dpmi_find_dos_memory()
55 memset(&r,0,sizeof(r));
56 r.x.eax = 0x0100; // DPMI allocate DOS memory
57 r.x.ebx = 0xffff; // Number of paragraphs requested
58 int386 (0x31, &r, &r);
59 //if ( (r.x.eax & 0xffff) == 0x08 )
60 //if ( (r.x.eax & 0xffff) == 0x08 )
62 return ((r.x.ebx & 0xffff)*16);
67 void *dpmi_real_malloc( int size, ushort *selector )
71 memset(&r,0,sizeof(r));
72 r.x.eax = 0x0100; // DPMI allocate DOS memory
73 r.x.ebx = (size + 15) >> 4; // Number of paragraphs requested
74 int386 (0x31, &r, &r);
76 if (r.x.cflag) // Failed
80 *selector = r.x.edx & 0xFFFF;
83 return (void *) ((r.x.eax & 0xFFFF) << 4)+__djgpp_conventional_base;
85 return (void *) ((r.x.eax & 0xFFFF) << 4);
89 void dpmi_real_free( ushort selector )
93 memset(&r,0,sizeof(r));
94 r.x.eax = 0x0101; // DPMI free DOS memory
95 r.x.ebx = selector; // Selector to free
96 int386 (0x31, &r, &r);
99 int dos_stack_initialized = 0;
100 ubyte * dos_stack = NULL;
101 ubyte * dos_stack_top = NULL;
102 #define DOS_STACK_SIZE (4*1024) // A big ol' 4K stack!!!
104 static void dpmi_setup_stack(dpmi_real_regs *rregs) {
105 ushort temp_selector;
107 if ( !dos_stack_initialized ) {
108 dos_stack_initialized = 1;
109 dos_stack = dpmi_real_malloc( DOS_STACK_SIZE, &temp_selector );
110 if ( dos_stack == NULL ) {
111 printf( "Error allocating real mode stack!\n" );
112 dos_stack_top = NULL;
114 dos_stack_top = &dos_stack[DOS_STACK_SIZE];
118 // Give this puppy a stack!!!
119 if ( dos_stack_top ) {
120 rregs->ss = DPMI_real_segment(dos_stack_top);
121 rregs->sp = DPMI_real_offset(dos_stack_top);
126 void dpmi_real_int386x( ubyte intno, dpmi_real_regs * rregs )
131 /* Use DMPI call 300h to issue the DOS interrupt */
133 dpmi_setup_stack(rregs);
134 memset(®s,0,sizeof(regs));
135 memset(&sregs,0,sizeof(sregs));
140 sregs.es = FP_SEG(rregs);
141 regs.x.edi = FP_OFF(rregs);
142 int386x( 0x31, ®s, ®s, &sregs );
145 void dpmi_real_call(dpmi_real_regs * rregs)
150 dpmi_setup_stack(rregs);
152 /* Use DMPI call 301h to call real mode procedure */
153 memset(®s,0,sizeof(regs));
154 memset(&sregs,0,sizeof(sregs));
158 sregs.es = FP_SEG(rregs);
159 regs.x.edi = FP_OFF(rregs);
160 int386x( 0x31, ®s, ®s, &sregs );
167 int dpmi_unlock_region(void *address, unsigned length)
172 linear = (unsigned int) address;
174 linear += __djgpp_base_address;
177 total_bytes -= length;
178 //mprintf( 1, "DPMI unlocked %d bytes\n", total_bytes );
180 memset(®s,0,sizeof(regs));
181 regs.w.ax = 0x601; // DPMI Unlock Linear Region
182 regs.w.bx = (linear >> 16); // Linear address in BX:CX
183 regs.w.cx = (linear & 0xFFFF);
185 regs.w.si = (length >> 16); // Length in SI:DI
186 regs.w.di = (length & 0xFFFF);
187 int386 (0x31, ®s, ®s);
188 return (! regs.w.cflag); // Return 0 if can't lock
191 int dpmi_lock_region(void *address, unsigned length)
196 linear = (unsigned int) address;
198 linear += __djgpp_base_address;
201 total_bytes += length;
202 //mprintf( 1, "DPMI Locked down %d bytes\n", total_bytes );
204 memset(®s,0,sizeof(regs));
205 regs.w.ax = 0x600; // DPMI Lock Linear Region
206 regs.w.bx = (linear >> 16); // Linear address in BX:CX
207 regs.w.cx = (linear & 0xFFFF);
209 regs.w.si = (length >> 16); // Length in SI:DI
210 regs.w.di = (length & 0xFFFF);
211 int386 (0x31, ®s, ®s);
212 return (! regs.w.cflag); // Return 0 if can't lock
216 int dpmi_modify_selector_base( ushort selector, void * address )
221 linear = (unsigned int)address;
223 linear += __djgpp_base_address;
226 memset(®s,0,sizeof(regs));
227 regs.w.ax = 0x0007; // DPMI Change Selector Base Addres
228 regs.w.bx = selector; // Selector to change
229 regs.w.cx = (linear >> 16); // Base address
230 regs.w.dx = (linear & 0xFFFF);
231 int386 (0x31, ®s, ®s); // call dpmi
233 return 0; // Return 0 if error
239 int dpmi_modify_selector_limit( ushort selector, int size )
242 unsigned int segment_limit;
244 segment_limit = (unsigned int) size;
246 memset(®s,0,sizeof(regs));
247 regs.w.ax = 0x0008; // DPMI Change Selector Limit
248 regs.w.bx = selector; // Selector to change
249 regs.w.cx = (segment_limit >> 16); // Size of selector
250 regs.w.dx = (segment_limit & 0xFFFF);
251 int386 (0x31, ®s, ®s); // call dpmi
253 return 0; // Return 0 if error
259 int dpmi_allocate_selector( void * address, int size, ushort * selector )
264 memset(®s,0,sizeof(regs));
265 regs.w.ax = 0; // DPMI Allocate Selector
266 regs.w.cx = 1; // Allocate 1 selector
267 int386 (0x31, ®s, ®s); // call dpmi
269 return 0; // Return 0 if error
270 *selector = regs.w.ax;
272 if ( !dpmi_modify_selector_base( *selector, address ) )
275 if ( !dpmi_modify_selector_limit( *selector, size ) )
278 // mprintf( 0, "Selector 0x%4x has base of 0x%8x, size %d bytes\n", *selector, linear,segment_limit);
283 static void * dpmi_dos_buffer = NULL;
284 static ushort dpmi_dos_selector = 0;
288 if (dpmi_dos_selector!=0) {
289 dpmi_dos_buffer = NULL;
290 dpmi_dos_selector = 0;
294 typedef struct mem_data {
295 int largest_block_bytes;
296 int max_unlocked_page_allocation;
297 int largest_lockable_pages;
300 int unused_physical_pages;
301 int total_physical_pages;
302 int free_linear_pages;
303 int paging_size_pages;
307 unsigned int dpmi_virtual_memory=0;
308 unsigned int dpmi_available_memory=0;
309 unsigned int dpmi_physical_memory=0;
310 unsigned int dpmi_dos_memory = 0;
313 extern void cdecl _GETDS();
314 extern void cdecl cstart_();
317 int dpmi_init(int verbose)
323 dpmi_dos_memory = dpmi_find_dos_memory();
325 dpmi_dos_buffer = dpmi_real_malloc( 1024, &dpmi_dos_selector);
326 if (!dpmi_dos_buffer) {
327 dpmi_dos_selector = 0;
328 printf( "Error allocating 1K of DOS memory\n" );
334 memset(®s,0,sizeof(regs));
335 regs.x.eax = 0x400; // DPMI Get Memory Info
336 int386( 0x31, ®s, ®s );
338 if (verbose) printf( "V%d.%d, CPU:%d, VMM:", regs.h.ah, regs.h.al, regs.h.cl );
340 if (verbose) printf( "1" );
341 dpmi_virtual_memory = 1;
343 if (verbose) printf( "0" );
347 //--------- Find available memory
348 memset(®s,0,sizeof(regs));
349 memset(&sregs,0,sizeof(sregs));
350 regs.x.eax = 0x500; // DPMI Get Memory Info
351 sregs.es = FP_SEG(&mi);
352 regs.x.edi = FP_OFF(&mi);
353 int386x( 0x31, ®s, ®s, &sregs );
355 if (verbose) printf( ", P:%dK", mi.largest_lockable_pages*4 );
356 if (dpmi_virtual_memory)
357 if (verbose) printf( ", A:%dK", mi.largest_block_bytes/1024 );
358 //dpmi_physical_memory = mi.largest_lockable_pages*4096;
359 //dpmi_available_memory = mi.largest_block_bytes;
360 dpmi_physical_memory = mi.total_physical_pages*4096;
361 dpmi_available_memory = mi.total_pages * 4096;
363 if (verbose) printf( "MemInfo failed!" );
364 dpmi_physical_memory = 16*1024*1024; // Assume 16 MB
365 dpmi_available_memory = 16*1024*1024; // Assume 16 MB
369 if (!dpmi_lock_region( _GETDS, 4096 )) {
370 printf( "Error locking _GETDS" );
373 if (!dpmi_lock_region( cstart_, 4096 )) {
374 printf( "Error locking cstart" );
377 if (!dpmi_lock_region( _chain_intr, 4096 )) {
378 printf( "Error locking _chain_intr" );
385 void *dpmi_get_temp_low_buffer( int size )
387 if ( dpmi_dos_buffer == NULL ) return NULL;
388 if ( size > 1024 ) return NULL;
390 return dpmi_dos_buffer;
393 int dpmi_set_pm_handler(unsigned intnum, void far * isr )
397 /* Use DMPI call 204h to get pm interrrupt */
398 memset(®s,0,sizeof(regs));
401 regs.w.cx = FP_SEG(isr);
402 regs.x.edx = FP_OFF(isr);
403 int386( 0x31, ®s, ®s );