1 // Post memory manager (PMM) calls
3 // Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
5 // This file may be distributed under the terms of the GNU LGPLv3 license.
7 #include "util.h" // checksum
8 #include "config.h" // BUILD_BIOS_ADDR
9 #include "memmap.h" // struct e820entry
10 #include "farptr.h" // GET_FARVAR
11 #include "biosvar.h" // GET_BDA
15 // The 16bit pmm entry points runs in "big real" mode, and can
16 // therefore read/write to the 32bit malloc variables.
17 #define GET_PMMVAR(var) ({ \
19 __GET_VAR("addr32 ", ES, (var)); })
20 #define SET_PMMVAR(var, val) do { \
22 __SET_VAR("addr32 ", ES, (var), (val)); \
25 #define GET_PMMVAR(var) (var)
26 #define SET_PMMVAR(var, val) do { (var) = (val); } while (0)
29 // Information on a reserved area.
31 struct allocinfo_s *next, **pprev;
32 void *data, *dataend, *allocend;
35 // Information on a tracked memory allocation.
36 struct allocdetail_s {
37 struct allocinfo_s detailinfo;
38 struct allocinfo_s datainfo;
42 // The various memory zones.
44 struct allocinfo_s *info;
47 struct zone_s ZoneLow;
48 struct zone_s ZoneHigh;
49 struct zone_s ZoneFSeg;
50 struct zone_s ZoneTmpLow;
51 struct zone_s ZoneTmpHigh;
53 struct zone_s *Zones[] = {
54 &ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh
58 /****************************************************************
59 * low-level memory reservations
60 ****************************************************************/
62 // Find and reserve space from a given zone
64 allocSpace(struct zone_s *zone, u32 size, u32 align, struct allocinfo_s *fill)
66 struct allocinfo_s *info;
67 for (info = GET_PMMVAR(zone->info); info; info = GET_PMMVAR(info->next)) {
68 void *dataend = GET_PMMVAR(info->dataend);
69 void *allocend = GET_PMMVAR(info->allocend);
70 void *newallocend = (void*)ALIGN_DOWN((u32)allocend - size, align);
71 if (newallocend >= dataend && newallocend <= allocend) {
72 // Found space - now reserve it.
73 struct allocinfo_s **pprev = GET_PMMVAR(info->pprev);
76 SET_PMMVAR(fill->next, info);
77 SET_PMMVAR(fill->pprev, pprev);
78 SET_PMMVAR(fill->data, newallocend);
79 SET_PMMVAR(fill->dataend, newallocend + size);
80 SET_PMMVAR(fill->allocend, allocend);
82 SET_PMMVAR(info->allocend, newallocend);
83 SET_PMMVAR(info->pprev, &fill->next);
84 SET_PMMVAR(*pprev, fill);
91 // Release space allocated with allocSpace()
93 freeSpace(struct allocinfo_s *info)
95 struct allocinfo_s *next = GET_PMMVAR(info->next);
96 struct allocinfo_s **pprev = GET_PMMVAR(info->pprev);
97 SET_PMMVAR(*pprev, next);
99 if (GET_PMMVAR(next->allocend) == GET_PMMVAR(info->data))
100 SET_PMMVAR(next->allocend, GET_PMMVAR(info->allocend));
101 SET_PMMVAR(next->pprev, pprev);
105 // Add new memory to a zone
107 addSpace(struct zone_s *zone, void *start, void *end)
109 // Find position to add space
110 struct allocinfo_s **pprev = &zone->info, *info;
112 info = GET_PMMVAR(*pprev);
113 if (!info || GET_PMMVAR(info->data) < start)
118 // Add space using temporary allocation info.
119 struct allocdetail_s tempdetail;
120 tempdetail.datainfo.next = info;
121 tempdetail.datainfo.pprev = pprev;
122 tempdetail.datainfo.data = tempdetail.datainfo.dataend = start;
123 tempdetail.datainfo.allocend = end;
124 struct allocdetail_s *tempdetailp = MAKE_FLATPTR(GET_SEG(SS), &tempdetail);
125 SET_PMMVAR(*pprev, &tempdetailp->datainfo);
127 SET_PMMVAR(info->pprev, &tempdetailp->datainfo.next);
129 // Allocate final allocation info.
130 struct allocdetail_s *detail = allocSpace(
131 &ZoneTmpHigh, sizeof(*detail), MALLOC_MIN_ALIGN, NULL);
133 detail = allocSpace(&ZoneTmpLow, sizeof(*detail)
134 , MALLOC_MIN_ALIGN, NULL);
136 SET_PMMVAR(*tempdetail.datainfo.pprev, tempdetail.datainfo.next);
137 if (tempdetail.datainfo.next)
138 SET_PMMVAR(tempdetail.datainfo.next->pprev
139 , tempdetail.datainfo.pprev);
145 // Replace temp alloc space with final alloc space
146 memcpy_fl(&detail->datainfo, &tempdetailp->datainfo
147 , sizeof(detail->datainfo));
148 SET_PMMVAR(detail->handle, PMM_DEFAULT_HANDLE);
150 SET_PMMVAR(*tempdetail.datainfo.pprev, &detail->datainfo);
151 if (tempdetail.datainfo.next)
152 SET_PMMVAR(tempdetail.datainfo.next->pprev, &detail->datainfo.next);
155 // Search all zones for an allocation obtained from allocSpace()
156 static struct allocinfo_s *
157 findAlloc(void *data)
160 for (i=0; i<ARRAY_SIZE(Zones); i++) {
161 struct zone_s *zone = GET_PMMVAR(Zones[i]);
162 struct allocinfo_s *info;
163 for (info = GET_PMMVAR(zone->info); info; info = GET_PMMVAR(info->next))
164 if (GET_PMMVAR(info->data) == data)
170 // Return the last sentinal node of a zone
171 static struct allocinfo_s *
172 findLast(struct zone_s *zone)
174 struct allocinfo_s *info = GET_PMMVAR(zone->info);
178 struct allocinfo_s *next = GET_PMMVAR(info->next);
186 /****************************************************************
188 ****************************************************************/
194 dprintf(3, "malloc setup\n");
196 // Populate temp high ram
199 for (i=e820_count-1; i>=0; i--) {
200 struct e820entry *en = &e820_list[i];
201 u64 end = en->start + en->size;
204 if (en->type != E820_RAM || end > 0xffffffff)
206 u32 s = en->start, e = end;
208 u32 newe = ALIGN_DOWN(e - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
209 if (newe <= e && newe >= s) {
214 addSpace(&ZoneTmpHigh, (void*)s, (void*)e);
217 // Populate other regions
218 addSpace(&ZoneTmpLow, (void*)BUILD_STACK_ADDR, (void*)BUILD_EBDA_MINIMUM);
219 addSpace(&ZoneFSeg, BiosTableSpace, &BiosTableSpace[CONFIG_MAX_BIOSTABLE]);
220 addSpace(&ZoneLow, (void*)BUILD_LOWRAM_END, (void*)BUILD_LOWRAM_END);
222 addSpace(&ZoneHigh, (void*)highram
223 , (void*)highram + CONFIG_MAX_HIGHTABLE);
224 add_e820(highram, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
228 // Update pointers after code relocation.
230 malloc_fixupreloc(void)
233 if (!CONFIG_RELOCATE_INIT)
235 dprintf(3, "malloc fixup reloc\n");
238 for (i=0; i<ARRAY_SIZE(Zones); i++) {
239 struct zone_s *zone = Zones[i];
240 zone->info->pprev = &zone->info;
245 malloc_finalize(void)
247 dprintf(3, "malloc finalize\n");
249 // Reserve more low-mem if needed.
250 u32 endlow = GET_BDA(mem_size_kb)*1024;
251 add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
253 // Give back unused high ram.
254 struct allocinfo_s *info = findLast(&ZoneHigh);
256 u32 giveback = ALIGN_DOWN(info->allocend - info->dataend, PAGE_SIZE);
257 add_e820((u32)info->dataend, giveback, E820_RAM);
258 dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
263 /****************************************************************
265 ****************************************************************/
269 relocate_ebda(u32 newebda, u32 oldebda, u8 ebda_size)
271 u32 lowram = GET_BDA(mem_size_kb) * 1024;
272 if (oldebda != lowram)
273 // EBDA isn't at end of ram - give up.
276 // Do copy (this assumes memcpy copies forward - otherwise memmove
278 memcpy_fl((void*)newebda, (void*)oldebda, ebda_size * 1024);
281 dprintf(1, "ebda moved from %x to %x\n", oldebda, newebda);
282 SET_BDA(mem_size_kb, newebda / 1024);
283 SET_BDA(ebda_seg, FLATPTR_TO_SEG(newebda));
287 // Support expanding the ZoneLow dynamically.
289 zonelow_expand(u32 size, u32 align)
291 struct allocinfo_s *info = findLast(&ZoneLow);
294 u32 oldpos = (u32)GET_PMMVAR(info->allocend);
295 u32 newpos = ALIGN_DOWN(oldpos - size, align);
296 u32 bottom = (u32)GET_PMMVAR(info->dataend);
297 if (newpos >= bottom && newpos <= oldpos)
298 // Space already present.
300 u16 ebda_seg = get_ebda_seg();
301 u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0);
302 u8 ebda_size = GET_EBDA2(ebda_seg, size);
303 u32 ebda_end = ebda_pos + ebda_size * 1024;
304 if (ebda_end != bottom)
305 // Something else is after ebda - can't use any existing space.
306 newpos = ALIGN_DOWN(ebda_end - size, align);
307 u32 newbottom = ALIGN_DOWN(newpos, 1024);
308 u32 newebda = ALIGN_DOWN(newbottom - ebda_size * 1024, 1024);
309 if (newebda < BUILD_EBDA_MINIMUM)
314 int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
319 if (ebda_end == bottom) {
320 SET_PMMVAR(info->data, (void*)newbottom);
321 SET_PMMVAR(info->dataend, (void*)newbottom);
323 addSpace(&ZoneLow, (void*)newbottom, (void*)ebda_end);
326 // Check if can expand the given zone to fulfill an allocation
328 allocExpandSpace(struct zone_s *zone, u32 size, u32 align
329 , struct allocinfo_s *fill)
331 void *data = allocSpace(zone, size, align, fill);
332 if (data || zone != &ZoneLow)
335 // Make sure to not move ebda while an optionrom is running.
336 if (unlikely(wait_preempt())) {
337 data = allocSpace(zone, size, align, fill);
342 zonelow_expand(size, align);
343 return allocSpace(zone, size, align, fill);
347 /****************************************************************
348 * tracked memory allocations
349 ****************************************************************/
351 // Allocate memory from the given zone and track it as a PMM allocation
353 pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align)
358 // Find and reserve space for bookkeeping.
359 struct allocdetail_s *detail = allocSpace(
360 &ZoneTmpHigh, sizeof(*detail), MALLOC_MIN_ALIGN, NULL);
362 detail = allocSpace(&ZoneTmpLow, sizeof(*detail)
363 , MALLOC_MIN_ALIGN, NULL);
368 // Find and reserve space for main allocation
369 void *data = allocExpandSpace(zone, size, align, &detail->datainfo);
371 freeSpace(&detail->detailinfo);
375 dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
376 " ret=%p (detail=%p)\n"
377 , zone, handle, size, align
379 SET_PMMVAR(detail->handle, handle);
384 // Free a data block allocated with pmm_malloc
388 struct allocinfo_s *info = findAlloc(data);
389 if (!info || data == (void*)info || data == GET_PMMVAR(info->dataend))
391 struct allocdetail_s *detail = container_of(
392 info, struct allocdetail_s, datainfo);
393 dprintf(8, "pmm_free %p (detail=%p)\n", data, detail);
395 freeSpace(&detail->detailinfo);
399 // Find the amount of free space in a given zone.
401 pmm_getspace(struct zone_s *zone)
403 // XXX - doesn't account for ZoneLow being able to grow.
404 // XXX - results not reliable when CONFIG_THREAD_OPTIONROMS
406 struct allocinfo_s *info;
407 for (info = GET_PMMVAR(zone->info); info; info = GET_PMMVAR(info->next)) {
408 u32 space = GET_PMMVAR(info->allocend) - GET_PMMVAR(info->dataend);
409 if (space > maxspace)
413 if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow)
415 // Account for space needed for PMM tracking.
416 u32 reserve = ALIGN(sizeof(struct allocdetail_s), MALLOC_MIN_ALIGN);
417 if (maxspace <= reserve)
419 return maxspace - reserve;
422 // Find the data block allocated with pmm_malloc with a given handle.
427 for (i=0; i<ARRAY_SIZE(Zones); i++) {
428 struct zone_s *zone = GET_PMMVAR(Zones[i]);
429 struct allocinfo_s *info;
430 for (info = GET_PMMVAR(zone->info); info
431 ; info = GET_PMMVAR(info->next)) {
432 if (GET_PMMVAR(info->data) != (void*)info)
434 struct allocdetail_s *detail = container_of(
435 info, struct allocdetail_s, detailinfo);
436 if (GET_PMMVAR(detail->handle) == handle)
437 return GET_PMMVAR(detail->datainfo.data);
444 /****************************************************************
446 ****************************************************************/
458 extern struct pmmheader PMMHEADER;
460 #define PMM_SIGNATURE 0x4d4d5024 // $PMM
463 struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = {
465 .length = sizeof(PMMHEADER),
466 .entry_seg = SEG_BIOS,
470 #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff
474 handle_pmm00(u16 *args)
476 u32 length = *(u32*)&args[1], handle = *(u32*)&args[3];
478 dprintf(3, "pmm00: length=%x handle=%x flags=%x\n"
479 , length, handle, flags);
480 struct zone_s *lowzone = &ZoneTmpLow, *highzone = &ZoneTmpHigh;
482 // Permanent memory request.
484 highzone = &ZoneHigh;
487 // Memory size request
493 return pmm_getspace(lowzone);
495 return pmm_getspace(highzone);
497 u32 spacelow = pmm_getspace(lowzone);
498 u32 spacehigh = pmm_getspace(highzone);
499 if (spacelow > spacehigh)
505 u32 size = length * 16;
508 u32 align = MALLOC_MIN_ALIGN;
510 align = 1<<__ffs(size);
511 if (align < MALLOC_MIN_ALIGN)
512 align = MALLOC_MIN_ALIGN;
519 return (u32)pmm_malloc(lowzone, handle, size, align);
521 return (u32)pmm_malloc(highzone, handle, size, align);
523 void *data = pmm_malloc(lowzone, handle, size, align);
526 return (u32)pmm_malloc(highzone, handle, size, align);
533 handle_pmm01(u16 *args)
535 u32 handle = *(u32*)&args[1];
536 dprintf(3, "pmm01: handle=%x\n", handle);
537 if (handle == PMM_DEFAULT_HANDLE)
539 return (u32)pmm_find(handle);
544 handle_pmm02(u16 *args)
546 u32 buffer = *(u32*)&args[1];
547 dprintf(3, "pmm02: buffer=%x\n", buffer);
548 int ret = pmm_free((void*)buffer);
556 handle_pmmXX(u16 *args)
558 return PMM_FUNCTION_NOT_SUPPORTED;
562 handle_pmm(u16 *args)
565 return PMM_FUNCTION_NOT_SUPPORTED;
568 dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1);
571 if (CONFIG_THREAD_OPTIONROMS) {
572 // Not a preemption event - don't wait in wait_preempt()
573 oldpreempt = CanPreempt;
579 case 0x00: ret = handle_pmm00(args); break;
580 case 0x01: ret = handle_pmm01(args); break;
581 case 0x02: ret = handle_pmm02(args); break;
582 default: ret = handle_pmmXX(args); break;
585 if (CONFIG_THREAD_OPTIONROMS)
586 CanPreempt = oldpreempt;
592 extern void entry_pmm(void);
600 dprintf(3, "init PMM\n");
602 PMMHEADER.signature = PMM_SIGNATURE;
603 PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
604 PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
613 dprintf(3, "finalize PMM\n");
615 PMMHEADER.signature = 0;
616 PMMHEADER.entry_offset = 0;