2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
3 SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
6 IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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.
19 #define _BORLAND_DOS_REGS 1
21 #include <sys/segments.h>
22 #include <sys/nearptr.h>
24 #define FP_SEG(p) _my_ds()
25 #define FP_OFF(p) (int)p
26 int _crt0_startup_flags=_CRT0_FLAG_NONMOVE_SBRK+_CRT0_FLAG_FILL_SBRK_MEMORY+_CRT0_FLAG_FILL_DEADBEEF+_CRT0_FLAG_NEARPTR+_CRT0_FLAG_NO_LFN;
40 int dpmi_find_dos_memory()
44 memset(&r,0,sizeof(r));
45 r.x.eax = 0x0100; // DPMI allocate DOS memory
46 r.x.ebx = 0xffff; // Number of paragraphs requested
47 int386 (0x31, &r, &r);
48 //if ( (r.x.eax & 0xffff) == 0x08 )
49 //if ( (r.x.eax & 0xffff) == 0x08 )
51 return ((r.x.ebx & 0xffff)*16);
56 void *dpmi_real_malloc( int size, ushort *selector )
60 memset(&r,0,sizeof(r));
61 r.x.eax = 0x0100; // DPMI allocate DOS memory
62 r.x.ebx = (size + 15) >> 4; // Number of paragraphs requested
63 int386 (0x31, &r, &r);
65 if (r.x.cflag) // Failed
69 *selector = r.x.edx & 0xFFFF;
72 return (void *) ((r.x.eax & 0xFFFF) << 4)+__djgpp_conventional_base;
74 return (void *) ((r.x.eax & 0xFFFF) << 4);
78 void dpmi_real_free( ushort selector )
82 memset(&r,0,sizeof(r));
83 r.x.eax = 0x0101; // DPMI free DOS memory
84 r.x.ebx = selector; // Selector to free
85 int386 (0x31, &r, &r);
88 int dos_stack_initialized = 0;
89 ubyte * dos_stack = NULL;
90 ubyte * dos_stack_top = NULL;
91 #define DOS_STACK_SIZE (4*1024) // A big ol' 4K stack!!!
93 static void dpmi_setup_stack(dpmi_real_regs *rregs) {
96 if ( !dos_stack_initialized ) {
97 dos_stack_initialized = 1;
98 dos_stack = dpmi_real_malloc( DOS_STACK_SIZE, &temp_selector );
99 if ( dos_stack == NULL ) {
100 printf( "Error allocating real mode stack!\n" );
101 dos_stack_top = NULL;
103 dos_stack_top = &dos_stack[DOS_STACK_SIZE];
107 // Give this puppy a stack!!!
108 if ( dos_stack_top ) {
109 rregs->ss = DPMI_real_segment(dos_stack_top);
110 rregs->sp = DPMI_real_offset(dos_stack_top);
115 void dpmi_real_int386x( ubyte intno, dpmi_real_regs * rregs )
120 /* Use DMPI call 300h to issue the DOS interrupt */
122 dpmi_setup_stack(rregs);
123 memset(®s,0,sizeof(regs));
124 memset(&sregs,0,sizeof(sregs));
129 sregs.es = FP_SEG(rregs);
130 regs.x.edi = FP_OFF(rregs);
131 int386x( 0x31, ®s, ®s, &sregs );
134 void dpmi_real_call(dpmi_real_regs * rregs)
139 dpmi_setup_stack(rregs);
141 /* Use DMPI call 301h to call real mode procedure */
142 memset(®s,0,sizeof(regs));
143 memset(&sregs,0,sizeof(sregs));
147 sregs.es = FP_SEG(rregs);
148 regs.x.edi = FP_OFF(rregs);
149 int386x( 0x31, ®s, ®s, &sregs );
156 int dpmi_unlock_region(void *address, unsigned length)
161 linear = (unsigned int) address;
163 linear += __djgpp_base_address;
166 total_bytes -= length;
167 //mprintf( 1, "DPMI unlocked %d bytes\n", total_bytes );
169 memset(®s,0,sizeof(regs));
170 regs.w.ax = 0x601; // DPMI Unlock Linear Region
171 regs.w.bx = (linear >> 16); // Linear address in BX:CX
172 regs.w.cx = (linear & 0xFFFF);
174 regs.w.si = (length >> 16); // Length in SI:DI
175 regs.w.di = (length & 0xFFFF);
176 int386 (0x31, ®s, ®s);
177 return (! regs.w.cflag); // Return 0 if can't lock
180 int dpmi_lock_region(void *address, unsigned length)
185 linear = (unsigned int) address;
187 linear += __djgpp_base_address;
190 total_bytes += length;
191 //mprintf( 1, "DPMI Locked down %d bytes\n", total_bytes );
193 memset(®s,0,sizeof(regs));
194 regs.w.ax = 0x600; // DPMI Lock Linear Region
195 regs.w.bx = (linear >> 16); // Linear address in BX:CX
196 regs.w.cx = (linear & 0xFFFF);
198 regs.w.si = (length >> 16); // Length in SI:DI
199 regs.w.di = (length & 0xFFFF);
200 int386 (0x31, ®s, ®s);
201 return (! regs.w.cflag); // Return 0 if can't lock
205 int dpmi_modify_selector_base( ushort selector, void * address )
210 linear = (unsigned int)address;
212 linear += __djgpp_base_address;
215 memset(®s,0,sizeof(regs));
216 regs.w.ax = 0x0007; // DPMI Change Selector Base Addres
217 regs.w.bx = selector; // Selector to change
218 regs.w.cx = (linear >> 16); // Base address
219 regs.w.dx = (linear & 0xFFFF);
220 int386 (0x31, ®s, ®s); // call dpmi
222 return 0; // Return 0 if error
228 int dpmi_modify_selector_limit( ushort selector, int size )
231 unsigned int segment_limit;
233 segment_limit = (unsigned int) size;
235 memset(®s,0,sizeof(regs));
236 regs.w.ax = 0x0008; // DPMI Change Selector Limit
237 regs.w.bx = selector; // Selector to change
238 regs.w.cx = (segment_limit >> 16); // Size of selector
239 regs.w.dx = (segment_limit & 0xFFFF);
240 int386 (0x31, ®s, ®s); // call dpmi
242 return 0; // Return 0 if error
248 int dpmi_allocate_selector( void * address, int size, ushort * selector )
253 memset(®s,0,sizeof(regs));
254 regs.w.ax = 0; // DPMI Allocate Selector
255 regs.w.cx = 1; // Allocate 1 selector
256 int386 (0x31, ®s, ®s); // call dpmi
258 return 0; // Return 0 if error
259 *selector = regs.w.ax;
261 if ( !dpmi_modify_selector_base( *selector, address ) )
264 if ( !dpmi_modify_selector_limit( *selector, size ) )
267 // mprintf( 0, "Selector 0x%4x has base of 0x%8x, size %d bytes\n", *selector, linear,segment_limit);
272 static void * dpmi_dos_buffer = NULL;
273 static ushort dpmi_dos_selector = 0;
277 if (dpmi_dos_selector!=0) {
278 dpmi_dos_buffer = NULL;
279 dpmi_dos_selector = 0;
283 typedef struct mem_data {
284 int largest_block_bytes;
285 int max_unlocked_page_allocation;
286 int largest_lockable_pages;
289 int unused_physical_pages;
290 int total_physical_pages;
291 int free_linear_pages;
292 int paging_size_pages;
296 unsigned int dpmi_virtual_memory=0;
297 unsigned int dpmi_available_memory=0;
298 unsigned int dpmi_physical_memory=0;
299 unsigned int dpmi_dos_memory = 0;
302 extern void cdecl _GETDS();
303 extern void cdecl cstart_();
306 int dpmi_init(int verbose)
312 dpmi_dos_memory = dpmi_find_dos_memory();
314 dpmi_dos_buffer = dpmi_real_malloc( 1024, &dpmi_dos_selector);
315 if (!dpmi_dos_buffer) {
316 dpmi_dos_selector = 0;
317 printf( "Error allocating 1K of DOS memory\n" );
323 memset(®s,0,sizeof(regs));
324 regs.x.eax = 0x400; // DPMI Get Memory Info
325 int386( 0x31, ®s, ®s );
327 if (verbose) printf( "V%d.%d, CPU:%d, VMM:", regs.h.ah, regs.h.al, regs.h.cl );
329 if (verbose) printf( "1" );
330 dpmi_virtual_memory = 1;
332 if (verbose) printf( "0" );
336 //--------- Find available memory
337 memset(®s,0,sizeof(regs));
338 memset(&sregs,0,sizeof(sregs));
339 regs.x.eax = 0x500; // DPMI Get Memory Info
340 sregs.es = FP_SEG(&mi);
341 regs.x.edi = FP_OFF(&mi);
342 int386x( 0x31, ®s, ®s, &sregs );
344 if (verbose) printf( ", P:%dK", mi.largest_lockable_pages*4 );
345 if (dpmi_virtual_memory)
346 if (verbose) printf( ", A:%dK", mi.largest_block_bytes/1024 );
347 //dpmi_physical_memory = mi.largest_lockable_pages*4096;
348 //dpmi_available_memory = mi.largest_block_bytes;
349 dpmi_physical_memory = mi.total_physical_pages*4096;
350 dpmi_available_memory = mi.total_pages * 4096;
352 if (verbose) printf( "MemInfo failed!" );
353 dpmi_physical_memory = 16*1024*1024; // Assume 16 MB
354 dpmi_available_memory = 16*1024*1024; // Assume 16 MB
358 if (!dpmi_lock_region( _GETDS, 4096 )) {
359 printf( "Error locking _GETDS" );
362 if (!dpmi_lock_region( cstart_, 4096 )) {
363 printf( "Error locking cstart" );
366 if (!dpmi_lock_region( _chain_intr, 4096 )) {
367 printf( "Error locking _chain_intr" );
374 void *dpmi_get_temp_low_buffer( int size )
376 if ( dpmi_dos_buffer == NULL ) return NULL;
377 if ( size > 1024 ) return NULL;
379 return dpmi_dos_buffer;
382 int dpmi_set_pm_handler(unsigned intnum, void far * isr )
386 /* Use DMPI call 204h to get pm interrrupt */
387 memset(®s,0,sizeof(regs));
390 regs.w.cx = FP_SEG(isr);
391 regs.x.edx = FP_OFF(isr);
392 int386( 0x31, ®s, ®s );
398 #endif // __ENV_DJGPP__