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 VAR32FLATVISIBLE;
48 struct zone_s ZoneHigh VAR32FLATVISIBLE;
49 struct zone_s ZoneFSeg VAR32FLATVISIBLE;
50 struct zone_s ZoneTmpLow VAR32FLATVISIBLE;
51 struct zone_s ZoneTmpHigh VAR32FLATVISIBLE;
53 struct zone_s *Zones[] VAR32FLATVISIBLE = {
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 ZoneLow.info = ZoneHigh.info = ZoneFSeg.info = NULL;
197 ZoneTmpLow.info = ZoneTmpHigh.info = NULL;
199 // Clear memory in 0xf0000 area.
200 memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE);
202 // Populate temp high ram
205 for (i=e820_count-1; i>=0; i--) {
206 struct e820entry *en = &e820_list[i];
207 u64 end = en->start + en->size;
210 if (en->type != E820_RAM || end > 0xffffffff)
212 u32 s = en->start, e = end;
214 u32 newe = ALIGN_DOWN(e - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
215 if (newe <= e && newe >= s) {
220 addSpace(&ZoneTmpHigh, (void*)s, (void*)e);
223 // Populate other regions
224 addSpace(&ZoneTmpLow, (void*)BUILD_STACK_ADDR, (void*)BUILD_EBDA_MINIMUM);
225 addSpace(&ZoneFSeg, BiosTableSpace, &BiosTableSpace[CONFIG_MAX_BIOSTABLE]);
226 addSpace(&ZoneLow, (void*)BUILD_LOWRAM_END, (void*)BUILD_LOWRAM_END);
228 addSpace(&ZoneHigh, (void*)highram
229 , (void*)highram + CONFIG_MAX_HIGHTABLE);
230 add_e820(highram, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
235 malloc_finalize(void)
237 dprintf(3, "malloc finalize\n");
239 // Reserve more low-mem if needed.
240 u32 endlow = GET_BDA(mem_size_kb)*1024;
241 add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
243 // Give back unused high ram.
244 struct allocinfo_s *info = findLast(&ZoneHigh);
246 u32 giveback = ALIGN_DOWN(info->allocend - info->dataend, PAGE_SIZE);
247 add_e820((u32)info->dataend, giveback, E820_RAM);
248 dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
253 /****************************************************************
255 ****************************************************************/
259 relocate_ebda(u32 newebda, u32 oldebda, u8 ebda_size)
261 u32 lowram = GET_BDA(mem_size_kb) * 1024;
262 if (oldebda != lowram)
263 // EBDA isn't at end of ram - give up.
266 // Do copy (this assumes memcpy copies forward - otherwise memmove
268 memcpy_fl((void*)newebda, (void*)oldebda, ebda_size * 1024);
271 dprintf(1, "ebda moved from %x to %x\n", oldebda, newebda);
272 SET_BDA(mem_size_kb, newebda / 1024);
273 SET_BDA(ebda_seg, FLATPTR_TO_SEG(newebda));
277 // Support expanding the ZoneLow dynamically.
279 zonelow_expand(u32 size, u32 align)
281 struct allocinfo_s *info = findLast(&ZoneLow);
284 u32 oldpos = (u32)GET_PMMVAR(info->allocend);
285 u32 newpos = ALIGN_DOWN(oldpos - size, align);
286 u32 bottom = (u32)GET_PMMVAR(info->dataend);
287 if (newpos >= bottom && newpos <= oldpos)
288 // Space already present.
290 u16 ebda_seg = get_ebda_seg();
291 u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0);
292 u8 ebda_size = GET_EBDA2(ebda_seg, size);
293 u32 ebda_end = ebda_pos + ebda_size * 1024;
294 if (ebda_end != bottom)
295 // Something else is after ebda - can't use any existing space.
296 newpos = ALIGN_DOWN(ebda_end - size, align);
297 u32 newbottom = ALIGN_DOWN(newpos, 1024);
298 u32 newebda = ALIGN_DOWN(newbottom - ebda_size * 1024, 1024);
299 if (newebda < BUILD_EBDA_MINIMUM)
304 int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
309 if (ebda_end == bottom) {
310 SET_PMMVAR(info->data, (void*)newbottom);
311 SET_PMMVAR(info->dataend, (void*)newbottom);
313 addSpace(&ZoneLow, (void*)newbottom, (void*)ebda_end);
316 // Check if can expand the given zone to fulfill an allocation
318 allocExpandSpace(struct zone_s *zone, u32 size, u32 align
319 , struct allocinfo_s *fill)
321 void *data = allocSpace(zone, size, align, fill);
322 if (data || zone != &ZoneLow)
325 // Make sure to not move ebda while an optionrom is running.
326 if (unlikely(wait_preempt())) {
327 data = allocSpace(zone, size, align, fill);
332 zonelow_expand(size, align);
333 return allocSpace(zone, size, align, fill);
337 /****************************************************************
338 * tracked memory allocations
339 ****************************************************************/
341 // Allocate memory from the given zone and track it as a PMM allocation
343 pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align)
348 // Find and reserve space for bookkeeping.
349 struct allocdetail_s *detail = allocSpace(
350 &ZoneTmpHigh, sizeof(*detail), MALLOC_MIN_ALIGN, NULL);
352 detail = allocSpace(&ZoneTmpLow, sizeof(*detail)
353 , MALLOC_MIN_ALIGN, NULL);
358 // Find and reserve space for main allocation
359 void *data = allocExpandSpace(zone, size, align, &detail->datainfo);
361 freeSpace(&detail->detailinfo);
365 dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
366 " ret=%p (detail=%p)\n"
367 , zone, handle, size, align
369 SET_PMMVAR(detail->handle, handle);
374 // Free a data block allocated with pmm_malloc
378 struct allocinfo_s *info = findAlloc(data);
379 if (!info || data == (void*)info || data == GET_PMMVAR(info->dataend))
381 struct allocdetail_s *detail = container_of(
382 info, struct allocdetail_s, datainfo);
383 dprintf(8, "pmm_free %p (detail=%p)\n", data, detail);
385 freeSpace(&detail->detailinfo);
389 // Find the amount of free space in a given zone.
391 pmm_getspace(struct zone_s *zone)
393 // XXX - doesn't account for ZoneLow being able to grow.
394 // XXX - results not reliable when CONFIG_THREAD_OPTIONROMS
396 struct allocinfo_s *info;
397 for (info = GET_PMMVAR(zone->info); info; info = GET_PMMVAR(info->next)) {
398 u32 space = GET_PMMVAR(info->allocend) - GET_PMMVAR(info->dataend);
399 if (space > maxspace)
403 if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow)
405 // Account for space needed for PMM tracking.
406 u32 reserve = ALIGN(sizeof(struct allocdetail_s), MALLOC_MIN_ALIGN);
407 if (maxspace <= reserve)
409 return maxspace - reserve;
412 // Find the data block allocated with pmm_malloc with a given handle.
417 for (i=0; i<ARRAY_SIZE(Zones); i++) {
418 struct zone_s *zone = GET_PMMVAR(Zones[i]);
419 struct allocinfo_s *info;
420 for (info = GET_PMMVAR(zone->info); info
421 ; info = GET_PMMVAR(info->next)) {
422 if (GET_PMMVAR(info->data) != (void*)info)
424 struct allocdetail_s *detail = container_of(
425 info, struct allocdetail_s, detailinfo);
426 if (GET_PMMVAR(detail->handle) == handle)
427 return GET_PMMVAR(detail->datainfo.data);
434 /****************************************************************
436 ****************************************************************/
448 extern struct pmmheader PMMHEADER;
450 #define PMM_SIGNATURE 0x4d4d5024 // $PMM
453 struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = {
455 .length = sizeof(PMMHEADER),
456 .entry_seg = SEG_BIOS,
460 #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff
464 handle_pmm00(u16 *args)
466 u32 length = *(u32*)&args[1], handle = *(u32*)&args[3];
468 dprintf(3, "pmm00: length=%x handle=%x flags=%x\n"
469 , length, handle, flags);
470 struct zone_s *lowzone = &ZoneTmpLow, *highzone = &ZoneTmpHigh;
472 // Permanent memory request.
474 highzone = &ZoneHigh;
477 // Memory size request
483 return pmm_getspace(lowzone);
485 return pmm_getspace(highzone);
487 u32 spacelow = pmm_getspace(lowzone);
488 u32 spacehigh = pmm_getspace(highzone);
489 if (spacelow > spacehigh)
495 u32 size = length * 16;
498 u32 align = MALLOC_MIN_ALIGN;
500 align = 1<<__ffs(size);
501 if (align < MALLOC_MIN_ALIGN)
502 align = MALLOC_MIN_ALIGN;
509 return (u32)pmm_malloc(lowzone, handle, size, align);
511 return (u32)pmm_malloc(highzone, handle, size, align);
513 void *data = pmm_malloc(lowzone, handle, size, align);
516 return (u32)pmm_malloc(highzone, handle, size, align);
523 handle_pmm01(u16 *args)
525 u32 handle = *(u32*)&args[1];
526 dprintf(3, "pmm01: handle=%x\n", handle);
527 if (handle == PMM_DEFAULT_HANDLE)
529 return (u32)pmm_find(handle);
534 handle_pmm02(u16 *args)
536 u32 buffer = *(u32*)&args[1];
537 dprintf(3, "pmm02: buffer=%x\n", buffer);
538 int ret = pmm_free((void*)buffer);
546 handle_pmmXX(u16 *args)
548 return PMM_FUNCTION_NOT_SUPPORTED;
552 handle_pmm(u16 *args)
555 return PMM_FUNCTION_NOT_SUPPORTED;
558 dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1);
561 case 0x00: return handle_pmm00(args);
562 case 0x01: return handle_pmm01(args);
563 case 0x02: return handle_pmm02(args);
564 default: return handle_pmmXX(args);
569 extern void entry_pmm(void);
577 dprintf(3, "init PMM\n");
579 PMMHEADER.signature = PMM_SIGNATURE;
580 PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
581 PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
590 dprintf(3, "finalize PMM\n");
592 PMMHEADER.signature = 0;
593 PMMHEADER.entry_offset = 0;