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1.1 root 1: // Post memory manager (PMM) calls
2: //
3: // Copyright (C) 2009 Kevin O'Connor <[email protected]>
4: //
5: // This file may be distributed under the terms of the GNU LGPLv3 license.
6:
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
12:
13:
1.1.1.2 ! root 14: #if MODESEGMENT
1.1 root 15: // The 16bit pmm entry points runs in "big real" mode, and can
16: // therefore read/write to the 32bit malloc variables.
1.1.1.2 ! root 17: #define GET_PMMVAR(var) ({ \
! 18: SET_SEG(ES, 0); \
! 19: __GET_VAR("addr32 ", ES, (var)); })
! 20: #define SET_PMMVAR(var, val) do { \
! 21: SET_SEG(ES, 0); \
! 22: __SET_VAR("addr32 ", ES, (var), (val)); \
! 23: } while (0)
1.1 root 24: #else
25: #define GET_PMMVAR(var) (var)
26: #define SET_PMMVAR(var, val) do { (var) = (val); } while (0)
27: #endif
28:
29: // Zone definitions
30: struct zone_s {
31: u32 top, bottom, cur;
32: };
33:
1.1.1.2 ! root 34: struct zone_s ZoneLow VAR32FLATVISIBLE, ZoneHigh VAR32FLATVISIBLE;
! 35: struct zone_s ZoneFSeg VAR32FLATVISIBLE;
! 36: struct zone_s ZoneTmpLow VAR32FLATVISIBLE, ZoneTmpHigh VAR32FLATVISIBLE;
1.1 root 37:
1.1.1.2 ! root 38: struct zone_s *Zones[] VAR32FLATVISIBLE = {
1.1 root 39: &ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh
40: };
41:
42:
43: /****************************************************************
44: * ebda movement
45: ****************************************************************/
46:
47: // Move ebda
48: static int
49: relocate_ebda(u32 newebda, u32 oldebda, u8 ebda_size)
50: {
51: u32 lowram = GET_BDA(mem_size_kb) * 1024;
52: if (oldebda != lowram)
53: // EBDA isn't at end of ram - give up.
54: return -1;
55:
56: // Do copy
1.1.1.2 ! root 57: if (MODESEGMENT)
1.1 root 58: memcpy_far(FLATPTR_TO_SEG(newebda)
59: , (void*)FLATPTR_TO_OFFSET(newebda)
60: , FLATPTR_TO_SEG(oldebda)
61: , (void*)FLATPTR_TO_OFFSET(oldebda)
62: , ebda_size * 1024);
63: else
64: memmove((void*)newebda, (void*)oldebda, ebda_size * 1024);
65:
66: // Update indexes
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));
70: return 0;
71: }
72:
73: // Support expanding the ZoneLow dynamically.
74: static void
75: zonelow_expand(u32 size, u32 align)
76: {
77: u32 oldpos = GET_PMMVAR(ZoneLow.cur);
78: u32 newpos = ALIGN_DOWN(oldpos - size, align);
79: u32 bottom = GET_PMMVAR(ZoneLow.bottom);
80: if (newpos >= bottom && newpos <= oldpos)
81: // Space already present.
82: return;
83: u16 ebda_seg = get_ebda_seg();
84: u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0);
85: u8 ebda_size = GET_EBDA2(ebda_seg, size);
86: u32 ebda_end = ebda_pos + ebda_size * 1024;
87: if (ebda_end != bottom) {
88: // Something else is after ebda - can't use any existing space.
89: oldpos = ebda_end;
90: newpos = ALIGN_DOWN(oldpos - size, align);
91: }
92: u32 newbottom = ALIGN_DOWN(newpos, 1024);
93: u32 newebda = ALIGN_DOWN(newbottom - ebda_size * 1024, 1024);
94: if (newebda < BUILD_EBDA_MINIMUM)
95: // Not enough space.
96: return;
97:
98: // Move ebda
99: int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
100: if (ret)
101: return;
102:
103: // Update zone
104: SET_PMMVAR(ZoneLow.cur, oldpos);
105: SET_PMMVAR(ZoneLow.bottom, newbottom);
106: }
107:
108:
109: /****************************************************************
110: * zone allocations
111: ****************************************************************/
112:
113: // Obtain memory from a given zone.
114: static void *
115: zone_malloc(struct zone_s *zone, u32 size, u32 align)
116: {
117: u32 oldpos = GET_PMMVAR(zone->cur);
118: u32 newpos = ALIGN_DOWN(oldpos - size, align);
119: if (newpos < GET_PMMVAR(zone->bottom) || newpos > oldpos)
120: // No space
121: return NULL;
122: SET_PMMVAR(zone->cur, newpos);
123: return (void*)newpos;
124: }
125:
126: // Find the zone that contains the given data block.
127: static struct zone_s *
128: zone_find(void *data)
129: {
130: int i;
131: for (i=0; i<ARRAY_SIZE(Zones); i++) {
132: struct zone_s *zone = GET_PMMVAR(Zones[i]);
133: if ((u32)data >= GET_PMMVAR(zone->cur)
134: && (u32)data < GET_PMMVAR(zone->top))
135: return zone;
136: }
137: return NULL;
138: }
139:
140: // Return memory to a zone (if it was the last to be allocated).
141: static int
142: zone_free(void *data, u32 olddata)
143: {
144: struct zone_s *zone = zone_find(data);
145: if (!zone || !data || GET_PMMVAR(zone->cur) != (u32)data)
146: return -1;
147: SET_PMMVAR(zone->cur, olddata);
148: return 0;
149: }
150:
151: // Report the status of all the zones.
152: static void
1.1.1.2 ! root 153: dumpZones(void)
1.1 root 154: {
155: int i;
156: for (i=0; i<ARRAY_SIZE(Zones); i++) {
157: struct zone_s *zone = Zones[i];
158: u32 used = zone->top - zone->cur;
159: u32 avail = zone->top - zone->bottom;
160: u32 pct = avail ? ((100 * used) / avail) : 0;
161: dprintf(2, "zone %d: %08x-%08x used=%d (%d%%)\n"
162: , i, zone->bottom, zone->top, used, pct);
163: }
164: }
165:
166:
167: /****************************************************************
168: * tracked memory allocations
169: ****************************************************************/
170:
171: // Information on PMM tracked allocations
172: struct pmmalloc_s {
173: void *data;
174: u32 olddata;
175: u32 handle;
176: u32 oldallocdata;
177: struct pmmalloc_s *next;
178: };
179:
1.1.1.2 ! root 180: struct pmmalloc_s *PMMAllocs VAR32FLATVISIBLE;
1.1 root 181:
182: // Allocate memory from the given zone and track it as a PMM allocation
183: void *
184: pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align)
185: {
186: u32 oldallocdata = GET_PMMVAR(ZoneTmpHigh.cur);
187: struct pmmalloc_s *info = zone_malloc(&ZoneTmpHigh, sizeof(*info)
188: , MALLOC_MIN_ALIGN);
189: if (!info) {
190: oldallocdata = GET_PMMVAR(ZoneTmpLow.cur);
191: info = zone_malloc(&ZoneTmpLow, sizeof(*info), MALLOC_MIN_ALIGN);
192: if (!info)
193: return NULL;
194: }
195: if (zone == &ZoneLow)
196: zonelow_expand(size, align);
197: u32 olddata = GET_PMMVAR(zone->cur);
198: void *data = zone_malloc(zone, size, align);
199: if (! data) {
200: zone_free(info, oldallocdata);
201: return NULL;
202: }
203: dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
204: " ret=%p (info=%p)\n"
205: , zone, handle, size, align
206: , data, info);
207: SET_PMMVAR(info->data, data);
208: SET_PMMVAR(info->olddata, olddata);
209: SET_PMMVAR(info->handle, handle);
210: SET_PMMVAR(info->oldallocdata, oldallocdata);
211: SET_PMMVAR(info->next, GET_PMMVAR(PMMAllocs));
212: SET_PMMVAR(PMMAllocs, info);
213: return data;
214: }
215:
216: // Free a raw data block (either from a zone or from pmm alloc list).
217: static void
218: pmm_free_data(void *data, u32 olddata)
219: {
220: int ret = zone_free(data, olddata);
221: if (!ret)
222: // Success - done.
223: return;
224: struct pmmalloc_s *info;
225: for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
226: if (GET_PMMVAR(info->olddata) == (u32)data) {
227: SET_PMMVAR(info->olddata, olddata);
228: return;
229: } else if (GET_PMMVAR(info->oldallocdata) == (u32)data) {
230: SET_PMMVAR(info->oldallocdata, olddata);
231: return;
232: }
233: }
234:
235: // Free a data block allocated with pmm_malloc
236: int
237: pmm_free(void *data)
238: {
239: struct pmmalloc_s **pinfo = &PMMAllocs;
240: for (;;) {
241: struct pmmalloc_s *info = GET_PMMVAR(*pinfo);
242: if (!info)
243: return -1;
244: if (GET_PMMVAR(info->data) == data) {
245: SET_PMMVAR(*pinfo, GET_PMMVAR(info->next));
246: u32 oldallocdata = GET_PMMVAR(info->oldallocdata);
247: u32 olddata = GET_PMMVAR(info->olddata);
248: pmm_free_data(data, olddata);
249: pmm_free_data(info, oldallocdata);
250: dprintf(8, "pmm_free data=%p olddata=%p oldallocdata=%p info=%p\n"
251: , data, (void*)olddata, (void*)oldallocdata, info);
252: return 0;
253: }
254: pinfo = &info->next;
255: }
256: }
257:
258: // Find the amount of free space in a given zone.
259: static u32
260: pmm_getspace(struct zone_s *zone)
261: {
262: // XXX - doesn't account for ZoneLow being able to grow.
263: u32 space = GET_PMMVAR(zone->cur) - GET_PMMVAR(zone->bottom);
264: if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow)
265: return space;
266: // Account for space needed for PMM tracking.
267: u32 reserve = ALIGN(sizeof(struct pmmalloc_s), MALLOC_MIN_ALIGN);
268: if (space <= reserve)
269: return 0;
270: return space - reserve;
271: }
272:
273: // Find the data block allocated with pmm_malloc with a given handle.
274: static void *
275: pmm_find(u32 handle)
276: {
277: struct pmmalloc_s *info;
278: for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
279: if (GET_PMMVAR(info->handle) == handle)
280: return GET_PMMVAR(info->data);
281: return NULL;
282: }
283:
284: void
1.1.1.2 ! root 285: malloc_setup(void)
1.1 root 286: {
1.1.1.2 ! root 287: ASSERT32FLAT();
1.1 root 288: dprintf(3, "malloc setup\n");
289:
290: PMMAllocs = NULL;
291:
292: // Memory in 0xf0000 area.
1.1.1.2 ! root 293: extern u8 code32flat_start[];
! 294: if ((u32)code32flat_start > BUILD_BIOS_ADDR)
1.1 root 295: // Clear unused parts of f-segment
1.1.1.2 ! root 296: memset((void*)BUILD_BIOS_ADDR, 0
! 297: , (u32)code32flat_start - BUILD_BIOS_ADDR);
1.1 root 298: memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE);
299: ZoneFSeg.bottom = (u32)BiosTableSpace;
300: ZoneFSeg.top = ZoneFSeg.cur = ZoneFSeg.bottom + CONFIG_MAX_BIOSTABLE;
301:
302: // Memory under 1Meg.
303: ZoneTmpLow.bottom = BUILD_STACK_ADDR;
304: ZoneTmpLow.top = ZoneTmpLow.cur = BUILD_EBDA_MINIMUM;
305:
306: // Permanent memory under 1Meg.
307: ZoneLow.bottom = ZoneLow.top = ZoneLow.cur = BUILD_LOWRAM_END;
308:
309: // Find memory at the top of ram.
310: struct e820entry *e = find_high_area(CONFIG_MAX_HIGHTABLE+MALLOC_MIN_ALIGN);
311: if (!e) {
312: // No memory above 1Meg
313: memset(&ZoneHigh, 0, sizeof(ZoneHigh));
314: memset(&ZoneTmpHigh, 0, sizeof(ZoneTmpHigh));
315: return;
316: }
317: u32 top = e->start + e->size, bottom = e->start;
318:
319: // Memory at top of ram.
320: ZoneHigh.bottom = ALIGN(top - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
321: ZoneHigh.top = ZoneHigh.cur = ZoneHigh.bottom + CONFIG_MAX_HIGHTABLE;
322: add_e820(ZoneHigh.bottom, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
323:
324: // Memory above 1Meg
325: ZoneTmpHigh.bottom = ALIGN(bottom, MALLOC_MIN_ALIGN);
326: ZoneTmpHigh.top = ZoneTmpHigh.cur = ZoneHigh.bottom;
327: }
328:
329: void
1.1.1.2 ! root 330: malloc_finalize(void)
1.1 root 331: {
332: dprintf(3, "malloc finalize\n");
333:
334: dumpZones();
335:
336: // Reserve more low-mem if needed.
337: u32 endlow = GET_BDA(mem_size_kb)*1024;
338: add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
339:
340: // Give back unused high ram.
341: u32 giveback = ALIGN_DOWN(ZoneHigh.cur - ZoneHigh.bottom, PAGE_SIZE);
342: add_e820(ZoneHigh.bottom, giveback, E820_RAM);
343: dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
344:
345: // Clear low-memory allocations.
346: memset((void*)ZoneTmpLow.bottom, 0, ZoneTmpLow.top - ZoneTmpLow.bottom);
347: }
348:
349:
350: /****************************************************************
351: * pmm interface
352: ****************************************************************/
353:
354: struct pmmheader {
355: u32 signature;
356: u8 version;
357: u8 length;
358: u8 checksum;
359: u16 entry_offset;
360: u16 entry_seg;
361: u8 reserved[5];
362: } PACKED;
363:
364: extern struct pmmheader PMMHEADER;
365:
366: #define PMM_SIGNATURE 0x4d4d5024 // $PMM
367:
368: #if CONFIG_PMM
369: struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = {
370: .version = 0x01,
371: .length = sizeof(PMMHEADER),
372: .entry_seg = SEG_BIOS,
373: };
374: #endif
375:
376: #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff
377:
378: // PMM - allocate
379: static u32
380: handle_pmm00(u16 *args)
381: {
382: u32 length = *(u32*)&args[1], handle = *(u32*)&args[3];
383: u16 flags = args[5];
384: dprintf(3, "pmm00: length=%x handle=%x flags=%x\n"
385: , length, handle, flags);
386: struct zone_s *lowzone = &ZoneTmpLow, *highzone = &ZoneTmpHigh;
387: if (flags & 8) {
388: // Permanent memory request.
389: lowzone = &ZoneLow;
390: highzone = &ZoneHigh;
391: }
392: if (!length) {
393: // Memory size request
394: switch (flags & 3) {
395: default:
396: case 0:
397: return 0;
398: case 1:
399: return pmm_getspace(lowzone);
400: case 2:
401: return pmm_getspace(highzone);
402: case 3: {
403: u32 spacelow = pmm_getspace(lowzone);
404: u32 spacehigh = pmm_getspace(highzone);
405: if (spacelow > spacehigh)
406: return spacelow;
407: return spacehigh;
408: }
409: }
410: }
411: u32 size = length * 16;
412: if ((s32)size <= 0)
413: return 0;
414: u32 align = MALLOC_MIN_ALIGN;
415: if (flags & 4) {
416: align = 1<<__ffs(size);
417: if (align < MALLOC_MIN_ALIGN)
418: align = MALLOC_MIN_ALIGN;
419: }
420: switch (flags & 3) {
421: default:
422: case 0:
423: return 0;
424: case 1:
425: return (u32)pmm_malloc(lowzone, handle, size, align);
426: case 2:
427: return (u32)pmm_malloc(highzone, handle, size, align);
428: case 3: {
429: void *data = pmm_malloc(lowzone, handle, size, align);
430: if (data)
431: return (u32)data;
432: return (u32)pmm_malloc(highzone, handle, size, align);
433: }
434: }
435: }
436:
437: // PMM - find
438: static u32
439: handle_pmm01(u16 *args)
440: {
441: u32 handle = *(u32*)&args[1];
442: dprintf(3, "pmm01: handle=%x\n", handle);
443: if (handle == PMM_DEFAULT_HANDLE)
444: return 0;
445: return (u32)pmm_find(handle);
446: }
447:
448: // PMM - deallocate
449: static u32
450: handle_pmm02(u16 *args)
451: {
452: u32 buffer = *(u32*)&args[1];
453: dprintf(3, "pmm02: buffer=%x\n", buffer);
454: int ret = pmm_free((void*)buffer);
455: if (ret)
456: // Error
457: return 1;
458: return 0;
459: }
460:
461: static u32
462: handle_pmmXX(u16 *args)
463: {
464: return PMM_FUNCTION_NOT_SUPPORTED;
465: }
466:
467: u32 VISIBLE16
468: handle_pmm(u16 *args)
469: {
470: if (! CONFIG_PMM)
471: return PMM_FUNCTION_NOT_SUPPORTED;
472:
473: u16 arg1 = args[0];
474: dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1);
475:
476: switch (arg1) {
477: case 0x00: return handle_pmm00(args);
478: case 0x01: return handle_pmm01(args);
479: case 0x02: return handle_pmm02(args);
480: default: return handle_pmmXX(args);
481: }
482: }
483:
484: // romlayout.S
1.1.1.2 ! root 485: extern void entry_pmm(void);
1.1 root 486:
487: void
1.1.1.2 ! root 488: pmm_setup(void)
1.1 root 489: {
490: if (! CONFIG_PMM)
491: return;
492:
493: dprintf(3, "init PMM\n");
494:
495: PMMHEADER.signature = PMM_SIGNATURE;
496: PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
497: PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
498: }
499:
500: void
1.1.1.2 ! root 501: pmm_finalize(void)
1.1 root 502: {
503: if (! CONFIG_PMM)
504: return;
505:
506: dprintf(3, "finalize PMM\n");
507:
508: PMMHEADER.signature = 0;
509: PMMHEADER.entry_offset = 0;
510: }
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