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" // find_high_area
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)
34 struct zone_s ZoneLow VAR32FLATVISIBLE, ZoneHigh VAR32FLATVISIBLE;
35 struct zone_s ZoneFSeg VAR32FLATVISIBLE;
36 struct zone_s ZoneTmpLow VAR32FLATVISIBLE, ZoneTmpHigh VAR32FLATVISIBLE;
38 struct zone_s *Zones[] VAR32FLATVISIBLE = {
39 &ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh
43 /****************************************************************
45 ****************************************************************/
49 relocate_ebda(u32 newebda, u32 oldebda, u8 ebda_size)
51 u32 lowram = GET_BDA(mem_size_kb) * 1024;
52 if (oldebda != lowram)
53 // EBDA isn't at end of ram - give up.
58 memcpy_far(FLATPTR_TO_SEG(newebda)
59 , (void*)FLATPTR_TO_OFFSET(newebda)
60 , FLATPTR_TO_SEG(oldebda)
61 , (void*)FLATPTR_TO_OFFSET(oldebda)
64 memmove((void*)newebda, (void*)oldebda, ebda_size * 1024);
67 dprintf(1, "ebda moved from %x to %x\n", oldebda, newebda);
68 SET_BDA(mem_size_kb, newebda / 1024);
69 SET_BDA(ebda_seg, FLATPTR_TO_SEG(newebda));
73 // Support expanding the ZoneLow dynamically.
75 zonelow_expand(u32 size, u32 align)
77 u32 oldpos, newpos, bottom;
79 oldpos = GET_PMMVAR(ZoneLow.cur);
80 newpos = ALIGN_DOWN(oldpos - size, align);
81 bottom = GET_PMMVAR(ZoneLow.bottom);
82 if (newpos >= bottom && newpos <= oldpos)
83 // Space already present.
85 // Make sure to not move ebda while an optionrom is running.
86 if (likely(!wait_preempt()))
89 u16 ebda_seg = get_ebda_seg();
90 u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0);
91 u8 ebda_size = GET_EBDA2(ebda_seg, size);
92 u32 ebda_end = ebda_pos + ebda_size * 1024;
93 if (ebda_end != bottom) {
94 // Something else is after ebda - can't use any existing space.
96 newpos = ALIGN_DOWN(oldpos - size, align);
98 u32 newbottom = ALIGN_DOWN(newpos, 1024);
99 u32 newebda = ALIGN_DOWN(newbottom - ebda_size * 1024, 1024);
100 if (newebda < BUILD_EBDA_MINIMUM)
105 int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
110 SET_PMMVAR(ZoneLow.cur, oldpos);
111 SET_PMMVAR(ZoneLow.bottom, newbottom);
115 /****************************************************************
117 ****************************************************************/
119 // Obtain memory from a given zone.
121 zone_malloc(struct zone_s *zone, u32 size, u32 align)
123 u32 oldpos = GET_PMMVAR(zone->cur);
124 u32 newpos = ALIGN_DOWN(oldpos - size, align);
125 if (newpos < GET_PMMVAR(zone->bottom) || newpos > oldpos)
128 SET_PMMVAR(zone->cur, newpos);
129 return (void*)newpos;
132 // Find the zone that contains the given data block.
133 static struct zone_s *
134 zone_find(void *data)
137 for (i=0; i<ARRAY_SIZE(Zones); i++) {
138 struct zone_s *zone = GET_PMMVAR(Zones[i]);
139 if ((u32)data >= GET_PMMVAR(zone->cur)
140 && (u32)data < GET_PMMVAR(zone->top))
146 // Return memory to a zone (if it was the last to be allocated).
148 zone_free(void *data, u32 olddata)
150 struct zone_s *zone = zone_find(data);
151 if (!zone || !data || GET_PMMVAR(zone->cur) != (u32)data)
153 SET_PMMVAR(zone->cur, olddata);
157 // Report the status of all the zones.
162 for (i=0; i<ARRAY_SIZE(Zones); i++) {
163 struct zone_s *zone = Zones[i];
164 u32 used = zone->top - zone->cur;
165 u32 avail = zone->top - zone->bottom;
166 u32 pct = avail ? ((100 * used) / avail) : 0;
167 dprintf(2, "zone %d: %08x-%08x used=%d (%d%%)\n"
168 , i, zone->bottom, zone->top, used, pct);
173 /****************************************************************
174 * tracked memory allocations
175 ****************************************************************/
177 // Information on PMM tracked allocations
183 struct pmmalloc_s *next;
186 struct pmmalloc_s *PMMAllocs VAR32FLATVISIBLE;
188 // Allocate memory from the given zone and track it as a PMM allocation
190 pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align)
192 u32 oldallocdata = GET_PMMVAR(ZoneTmpHigh.cur);
193 struct pmmalloc_s *info = zone_malloc(&ZoneTmpHigh, sizeof(*info)
196 oldallocdata = GET_PMMVAR(ZoneTmpLow.cur);
197 info = zone_malloc(&ZoneTmpLow, sizeof(*info), MALLOC_MIN_ALIGN);
201 if (zone == &ZoneLow)
202 zonelow_expand(size, align);
203 u32 olddata = GET_PMMVAR(zone->cur);
204 void *data = zone_malloc(zone, size, align);
206 zone_free(info, oldallocdata);
209 dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
210 " ret=%p (info=%p)\n"
211 , zone, handle, size, align
213 SET_PMMVAR(info->data, data);
214 SET_PMMVAR(info->olddata, olddata);
215 SET_PMMVAR(info->handle, handle);
216 SET_PMMVAR(info->oldallocdata, oldallocdata);
217 SET_PMMVAR(info->next, GET_PMMVAR(PMMAllocs));
218 SET_PMMVAR(PMMAllocs, info);
222 // Free a raw data block (either from a zone or from pmm alloc list).
224 pmm_free_data(void *data, u32 olddata)
226 int ret = zone_free(data, olddata);
230 struct pmmalloc_s *info;
231 for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
232 if (GET_PMMVAR(info->olddata) == (u32)data) {
233 SET_PMMVAR(info->olddata, olddata);
235 } else if (GET_PMMVAR(info->oldallocdata) == (u32)data) {
236 SET_PMMVAR(info->oldallocdata, olddata);
241 // Free a data block allocated with pmm_malloc
245 struct pmmalloc_s **pinfo = &PMMAllocs;
247 struct pmmalloc_s *info = GET_PMMVAR(*pinfo);
250 if (GET_PMMVAR(info->data) == data) {
251 SET_PMMVAR(*pinfo, GET_PMMVAR(info->next));
252 u32 oldallocdata = GET_PMMVAR(info->oldallocdata);
253 u32 olddata = GET_PMMVAR(info->olddata);
254 pmm_free_data(data, olddata);
255 pmm_free_data(info, oldallocdata);
256 dprintf(8, "pmm_free data=%p olddata=%p oldallocdata=%p info=%p\n"
257 , data, (void*)olddata, (void*)oldallocdata, info);
264 // Find the amount of free space in a given zone.
266 pmm_getspace(struct zone_s *zone)
268 // XXX - doesn't account for ZoneLow being able to grow.
269 u32 space = GET_PMMVAR(zone->cur) - GET_PMMVAR(zone->bottom);
270 if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow)
272 // Account for space needed for PMM tracking.
273 u32 reserve = ALIGN(sizeof(struct pmmalloc_s), MALLOC_MIN_ALIGN);
274 if (space <= reserve)
276 return space - reserve;
279 // Find the data block allocated with pmm_malloc with a given handle.
283 struct pmmalloc_s *info;
284 for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
285 if (GET_PMMVAR(info->handle) == handle)
286 return GET_PMMVAR(info->data);
294 dprintf(3, "malloc setup\n");
298 // Memory in 0xf0000 area.
299 extern u8 code32flat_start[];
300 if ((u32)code32flat_start > BUILD_BIOS_ADDR)
301 // Clear unused parts of f-segment
302 memset((void*)BUILD_BIOS_ADDR, 0
303 , (u32)code32flat_start - BUILD_BIOS_ADDR);
304 memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE);
305 ZoneFSeg.bottom = (u32)BiosTableSpace;
306 ZoneFSeg.top = ZoneFSeg.cur = ZoneFSeg.bottom + CONFIG_MAX_BIOSTABLE;
308 // Memory under 1Meg.
309 ZoneTmpLow.bottom = BUILD_STACK_ADDR;
310 ZoneTmpLow.top = ZoneTmpLow.cur = BUILD_EBDA_MINIMUM;
312 // Permanent memory under 1Meg.
313 ZoneLow.bottom = ZoneLow.top = ZoneLow.cur = BUILD_LOWRAM_END;
315 // Find memory at the top of ram.
316 struct e820entry *e = find_high_area(CONFIG_MAX_HIGHTABLE+MALLOC_MIN_ALIGN);
318 // No memory above 1Meg
319 memset(&ZoneHigh, 0, sizeof(ZoneHigh));
320 memset(&ZoneTmpHigh, 0, sizeof(ZoneTmpHigh));
323 u32 top = e->start + e->size, bottom = e->start;
325 // Memory at top of ram.
326 ZoneHigh.bottom = ALIGN(top - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
327 ZoneHigh.top = ZoneHigh.cur = ZoneHigh.bottom + CONFIG_MAX_HIGHTABLE;
328 add_e820(ZoneHigh.bottom, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
331 ZoneTmpHigh.bottom = ALIGN(bottom, MALLOC_MIN_ALIGN);
332 ZoneTmpHigh.top = ZoneTmpHigh.cur = ZoneHigh.bottom;
336 malloc_finalize(void)
338 dprintf(3, "malloc finalize\n");
342 // Reserve more low-mem if needed.
343 u32 endlow = GET_BDA(mem_size_kb)*1024;
344 add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
346 // Give back unused high ram.
347 u32 giveback = ALIGN_DOWN(ZoneHigh.cur - ZoneHigh.bottom, PAGE_SIZE);
348 add_e820(ZoneHigh.bottom, giveback, E820_RAM);
349 dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
351 // Clear low-memory allocations.
352 memset((void*)ZoneTmpLow.bottom, 0, ZoneTmpLow.top - ZoneTmpLow.bottom);
356 /****************************************************************
358 ****************************************************************/
370 extern struct pmmheader PMMHEADER;
372 #define PMM_SIGNATURE 0x4d4d5024 // $PMM
375 struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = {
377 .length = sizeof(PMMHEADER),
378 .entry_seg = SEG_BIOS,
382 #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff
386 handle_pmm00(u16 *args)
388 u32 length = *(u32*)&args[1], handle = *(u32*)&args[3];
390 dprintf(3, "pmm00: length=%x handle=%x flags=%x\n"
391 , length, handle, flags);
392 struct zone_s *lowzone = &ZoneTmpLow, *highzone = &ZoneTmpHigh;
394 // Permanent memory request.
396 highzone = &ZoneHigh;
399 // Memory size request
405 return pmm_getspace(lowzone);
407 return pmm_getspace(highzone);
409 u32 spacelow = pmm_getspace(lowzone);
410 u32 spacehigh = pmm_getspace(highzone);
411 if (spacelow > spacehigh)
417 u32 size = length * 16;
420 u32 align = MALLOC_MIN_ALIGN;
422 align = 1<<__ffs(size);
423 if (align < MALLOC_MIN_ALIGN)
424 align = MALLOC_MIN_ALIGN;
431 return (u32)pmm_malloc(lowzone, handle, size, align);
433 return (u32)pmm_malloc(highzone, handle, size, align);
435 void *data = pmm_malloc(lowzone, handle, size, align);
438 return (u32)pmm_malloc(highzone, handle, size, align);
445 handle_pmm01(u16 *args)
447 u32 handle = *(u32*)&args[1];
448 dprintf(3, "pmm01: handle=%x\n", handle);
449 if (handle == PMM_DEFAULT_HANDLE)
451 return (u32)pmm_find(handle);
456 handle_pmm02(u16 *args)
458 u32 buffer = *(u32*)&args[1];
459 dprintf(3, "pmm02: buffer=%x\n", buffer);
460 int ret = pmm_free((void*)buffer);
468 handle_pmmXX(u16 *args)
470 return PMM_FUNCTION_NOT_SUPPORTED;
474 handle_pmm(u16 *args)
477 return PMM_FUNCTION_NOT_SUPPORTED;
480 dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1);
483 case 0x00: return handle_pmm00(args);
484 case 0x01: return handle_pmm01(args);
485 case 0x02: return handle_pmm02(args);
486 default: return handle_pmmXX(args);
491 extern void entry_pmm(void);
499 dprintf(3, "init PMM\n");
501 PMMHEADER.signature = PMM_SIGNATURE;
502 PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
503 PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
512 dprintf(3, "finalize PMM\n");
514 PMMHEADER.signature = 0;
515 PMMHEADER.entry_offset = 0;