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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:
14: #if MODE16
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) GET_FARVAR(0, (var))
18: #define SET_PMMVAR(var, val) SET_FARVAR(0, (var), (val))
19: #else
20: #define GET_PMMVAR(var) (var)
21: #define SET_PMMVAR(var, val) do { (var) = (val); } while (0)
22: #endif
23:
24: // Zone definitions
25: struct zone_s {
26: u32 top, bottom, cur;
27: };
28:
29: struct zone_s ZoneLow VAR32VISIBLE, ZoneHigh VAR32VISIBLE;
30: struct zone_s ZoneFSeg VAR32VISIBLE;
31: struct zone_s ZoneTmpLow VAR32VISIBLE, ZoneTmpHigh VAR32VISIBLE;
32:
33: struct zone_s *Zones[] VAR32VISIBLE = {
34: &ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh
35: };
36:
37:
38: /****************************************************************
39: * ebda movement
40: ****************************************************************/
41:
42: // Move ebda
43: static int
44: relocate_ebda(u32 newebda, u32 oldebda, u8 ebda_size)
45: {
46: u32 lowram = GET_BDA(mem_size_kb) * 1024;
47: if (oldebda != lowram)
48: // EBDA isn't at end of ram - give up.
49: return -1;
50:
51: // Do copy
52: if (MODE16)
53: memcpy_far(FLATPTR_TO_SEG(newebda)
54: , (void*)FLATPTR_TO_OFFSET(newebda)
55: , FLATPTR_TO_SEG(oldebda)
56: , (void*)FLATPTR_TO_OFFSET(oldebda)
57: , ebda_size * 1024);
58: else
59: memmove((void*)newebda, (void*)oldebda, ebda_size * 1024);
60:
61: // Update indexes
62: dprintf(1, "ebda moved from %x to %x\n", oldebda, newebda);
63: SET_BDA(mem_size_kb, newebda / 1024);
64: SET_BDA(ebda_seg, FLATPTR_TO_SEG(newebda));
65: return 0;
66: }
67:
68: // Support expanding the ZoneLow dynamically.
69: static void
70: zonelow_expand(u32 size, u32 align)
71: {
72: u32 oldpos = GET_PMMVAR(ZoneLow.cur);
73: u32 newpos = ALIGN_DOWN(oldpos - size, align);
74: u32 bottom = GET_PMMVAR(ZoneLow.bottom);
75: if (newpos >= bottom && newpos <= oldpos)
76: // Space already present.
77: return;
78: u16 ebda_seg = get_ebda_seg();
79: u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0);
80: u8 ebda_size = GET_EBDA2(ebda_seg, size);
81: u32 ebda_end = ebda_pos + ebda_size * 1024;
82: if (ebda_end != bottom) {
83: // Something else is after ebda - can't use any existing space.
84: oldpos = ebda_end;
85: newpos = ALIGN_DOWN(oldpos - size, align);
86: }
87: u32 newbottom = ALIGN_DOWN(newpos, 1024);
88: u32 newebda = ALIGN_DOWN(newbottom - ebda_size * 1024, 1024);
89: if (newebda < BUILD_EBDA_MINIMUM)
90: // Not enough space.
91: return;
92:
93: // Move ebda
94: int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
95: if (ret)
96: return;
97:
98: // Update zone
99: SET_PMMVAR(ZoneLow.cur, oldpos);
100: SET_PMMVAR(ZoneLow.bottom, newbottom);
101: }
102:
103:
104: /****************************************************************
105: * zone allocations
106: ****************************************************************/
107:
108: // Obtain memory from a given zone.
109: static void *
110: zone_malloc(struct zone_s *zone, u32 size, u32 align)
111: {
112: u32 oldpos = GET_PMMVAR(zone->cur);
113: u32 newpos = ALIGN_DOWN(oldpos - size, align);
114: if (newpos < GET_PMMVAR(zone->bottom) || newpos > oldpos)
115: // No space
116: return NULL;
117: SET_PMMVAR(zone->cur, newpos);
118: return (void*)newpos;
119: }
120:
121: // Find the zone that contains the given data block.
122: static struct zone_s *
123: zone_find(void *data)
124: {
125: int i;
126: for (i=0; i<ARRAY_SIZE(Zones); i++) {
127: struct zone_s *zone = GET_PMMVAR(Zones[i]);
128: if ((u32)data >= GET_PMMVAR(zone->cur)
129: && (u32)data < GET_PMMVAR(zone->top))
130: return zone;
131: }
132: return NULL;
133: }
134:
135: // Return memory to a zone (if it was the last to be allocated).
136: static int
137: zone_free(void *data, u32 olddata)
138: {
139: struct zone_s *zone = zone_find(data);
140: if (!zone || !data || GET_PMMVAR(zone->cur) != (u32)data)
141: return -1;
142: SET_PMMVAR(zone->cur, olddata);
143: return 0;
144: }
145:
146: // Report the status of all the zones.
147: static void
148: dumpZones()
149: {
150: int i;
151: for (i=0; i<ARRAY_SIZE(Zones); i++) {
152: struct zone_s *zone = Zones[i];
153: u32 used = zone->top - zone->cur;
154: u32 avail = zone->top - zone->bottom;
155: u32 pct = avail ? ((100 * used) / avail) : 0;
156: dprintf(2, "zone %d: %08x-%08x used=%d (%d%%)\n"
157: , i, zone->bottom, zone->top, used, pct);
158: }
159: }
160:
161:
162: /****************************************************************
163: * tracked memory allocations
164: ****************************************************************/
165:
166: // Information on PMM tracked allocations
167: struct pmmalloc_s {
168: void *data;
169: u32 olddata;
170: u32 handle;
171: u32 oldallocdata;
172: struct pmmalloc_s *next;
173: };
174:
175: struct pmmalloc_s *PMMAllocs VAR32VISIBLE;
176:
177: // Allocate memory from the given zone and track it as a PMM allocation
178: void *
179: pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align)
180: {
181: u32 oldallocdata = GET_PMMVAR(ZoneTmpHigh.cur);
182: struct pmmalloc_s *info = zone_malloc(&ZoneTmpHigh, sizeof(*info)
183: , MALLOC_MIN_ALIGN);
184: if (!info) {
185: oldallocdata = GET_PMMVAR(ZoneTmpLow.cur);
186: info = zone_malloc(&ZoneTmpLow, sizeof(*info), MALLOC_MIN_ALIGN);
187: if (!info)
188: return NULL;
189: }
190: if (zone == &ZoneLow)
191: zonelow_expand(size, align);
192: u32 olddata = GET_PMMVAR(zone->cur);
193: void *data = zone_malloc(zone, size, align);
194: if (! data) {
195: zone_free(info, oldallocdata);
196: return NULL;
197: }
198: dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
199: " ret=%p (info=%p)\n"
200: , zone, handle, size, align
201: , data, info);
202: SET_PMMVAR(info->data, data);
203: SET_PMMVAR(info->olddata, olddata);
204: SET_PMMVAR(info->handle, handle);
205: SET_PMMVAR(info->oldallocdata, oldallocdata);
206: SET_PMMVAR(info->next, GET_PMMVAR(PMMAllocs));
207: SET_PMMVAR(PMMAllocs, info);
208: return data;
209: }
210:
211: // Free a raw data block (either from a zone or from pmm alloc list).
212: static void
213: pmm_free_data(void *data, u32 olddata)
214: {
215: int ret = zone_free(data, olddata);
216: if (!ret)
217: // Success - done.
218: return;
219: struct pmmalloc_s *info;
220: for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
221: if (GET_PMMVAR(info->olddata) == (u32)data) {
222: SET_PMMVAR(info->olddata, olddata);
223: return;
224: } else if (GET_PMMVAR(info->oldallocdata) == (u32)data) {
225: SET_PMMVAR(info->oldallocdata, olddata);
226: return;
227: }
228: }
229:
230: // Free a data block allocated with pmm_malloc
231: int
232: pmm_free(void *data)
233: {
234: struct pmmalloc_s **pinfo = &PMMAllocs;
235: for (;;) {
236: struct pmmalloc_s *info = GET_PMMVAR(*pinfo);
237: if (!info)
238: return -1;
239: if (GET_PMMVAR(info->data) == data) {
240: SET_PMMVAR(*pinfo, GET_PMMVAR(info->next));
241: u32 oldallocdata = GET_PMMVAR(info->oldallocdata);
242: u32 olddata = GET_PMMVAR(info->olddata);
243: pmm_free_data(data, olddata);
244: pmm_free_data(info, oldallocdata);
245: dprintf(8, "pmm_free data=%p olddata=%p oldallocdata=%p info=%p\n"
246: , data, (void*)olddata, (void*)oldallocdata, info);
247: return 0;
248: }
249: pinfo = &info->next;
250: }
251: }
252:
253: // Find the amount of free space in a given zone.
254: static u32
255: pmm_getspace(struct zone_s *zone)
256: {
257: // XXX - doesn't account for ZoneLow being able to grow.
258: u32 space = GET_PMMVAR(zone->cur) - GET_PMMVAR(zone->bottom);
259: if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow)
260: return space;
261: // Account for space needed for PMM tracking.
262: u32 reserve = ALIGN(sizeof(struct pmmalloc_s), MALLOC_MIN_ALIGN);
263: if (space <= reserve)
264: return 0;
265: return space - reserve;
266: }
267:
268: // Find the data block allocated with pmm_malloc with a given handle.
269: static void *
270: pmm_find(u32 handle)
271: {
272: struct pmmalloc_s *info;
273: for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
274: if (GET_PMMVAR(info->handle) == handle)
275: return GET_PMMVAR(info->data);
276: return NULL;
277: }
278:
279: void
280: malloc_setup()
281: {
282: ASSERT32();
283: dprintf(3, "malloc setup\n");
284:
285: PMMAllocs = NULL;
286:
287: // Memory in 0xf0000 area.
288: extern u8 code32_start[];
289: if ((u32)code32_start > BUILD_BIOS_ADDR)
290: // Clear unused parts of f-segment
291: memset((void*)BUILD_BIOS_ADDR, 0, (u32)code32_start - BUILD_BIOS_ADDR);
292: memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE);
293: ZoneFSeg.bottom = (u32)BiosTableSpace;
294: ZoneFSeg.top = ZoneFSeg.cur = ZoneFSeg.bottom + CONFIG_MAX_BIOSTABLE;
295:
296: // Memory under 1Meg.
297: ZoneTmpLow.bottom = BUILD_STACK_ADDR;
298: ZoneTmpLow.top = ZoneTmpLow.cur = BUILD_EBDA_MINIMUM;
299:
300: // Permanent memory under 1Meg.
301: ZoneLow.bottom = ZoneLow.top = ZoneLow.cur = BUILD_LOWRAM_END;
302:
303: // Find memory at the top of ram.
304: struct e820entry *e = find_high_area(CONFIG_MAX_HIGHTABLE+MALLOC_MIN_ALIGN);
305: if (!e) {
306: // No memory above 1Meg
307: memset(&ZoneHigh, 0, sizeof(ZoneHigh));
308: memset(&ZoneTmpHigh, 0, sizeof(ZoneTmpHigh));
309: return;
310: }
311: u32 top = e->start + e->size, bottom = e->start;
312:
313: // Memory at top of ram.
314: ZoneHigh.bottom = ALIGN(top - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
315: ZoneHigh.top = ZoneHigh.cur = ZoneHigh.bottom + CONFIG_MAX_HIGHTABLE;
316: add_e820(ZoneHigh.bottom, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
317:
318: // Memory above 1Meg
319: ZoneTmpHigh.bottom = ALIGN(bottom, MALLOC_MIN_ALIGN);
320: ZoneTmpHigh.top = ZoneTmpHigh.cur = ZoneHigh.bottom;
321: }
322:
323: void
324: malloc_finalize()
325: {
326: dprintf(3, "malloc finalize\n");
327:
328: dumpZones();
329:
330: // Reserve more low-mem if needed.
331: u32 endlow = GET_BDA(mem_size_kb)*1024;
332: add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
333:
334: // Give back unused high ram.
335: u32 giveback = ALIGN_DOWN(ZoneHigh.cur - ZoneHigh.bottom, PAGE_SIZE);
336: add_e820(ZoneHigh.bottom, giveback, E820_RAM);
337: dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
338:
339: // Clear low-memory allocations.
340: memset((void*)ZoneTmpLow.bottom, 0, ZoneTmpLow.top - ZoneTmpLow.bottom);
341: }
342:
343:
344: /****************************************************************
345: * pmm interface
346: ****************************************************************/
347:
348: struct pmmheader {
349: u32 signature;
350: u8 version;
351: u8 length;
352: u8 checksum;
353: u16 entry_offset;
354: u16 entry_seg;
355: u8 reserved[5];
356: } PACKED;
357:
358: extern struct pmmheader PMMHEADER;
359:
360: #define PMM_SIGNATURE 0x4d4d5024 // $PMM
361:
362: #if CONFIG_PMM
363: struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = {
364: .version = 0x01,
365: .length = sizeof(PMMHEADER),
366: .entry_seg = SEG_BIOS,
367: };
368: #endif
369:
370: #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff
371:
372: // PMM - allocate
373: static u32
374: handle_pmm00(u16 *args)
375: {
376: u32 length = *(u32*)&args[1], handle = *(u32*)&args[3];
377: u16 flags = args[5];
378: dprintf(3, "pmm00: length=%x handle=%x flags=%x\n"
379: , length, handle, flags);
380: struct zone_s *lowzone = &ZoneTmpLow, *highzone = &ZoneTmpHigh;
381: if (flags & 8) {
382: // Permanent memory request.
383: lowzone = &ZoneLow;
384: highzone = &ZoneHigh;
385: }
386: if (!length) {
387: // Memory size request
388: switch (flags & 3) {
389: default:
390: case 0:
391: return 0;
392: case 1:
393: return pmm_getspace(lowzone);
394: case 2:
395: return pmm_getspace(highzone);
396: case 3: {
397: u32 spacelow = pmm_getspace(lowzone);
398: u32 spacehigh = pmm_getspace(highzone);
399: if (spacelow > spacehigh)
400: return spacelow;
401: return spacehigh;
402: }
403: }
404: }
405: u32 size = length * 16;
406: if ((s32)size <= 0)
407: return 0;
408: u32 align = MALLOC_MIN_ALIGN;
409: if (flags & 4) {
410: align = 1<<__ffs(size);
411: if (align < MALLOC_MIN_ALIGN)
412: align = MALLOC_MIN_ALIGN;
413: }
414: switch (flags & 3) {
415: default:
416: case 0:
417: return 0;
418: case 1:
419: return (u32)pmm_malloc(lowzone, handle, size, align);
420: case 2:
421: return (u32)pmm_malloc(highzone, handle, size, align);
422: case 3: {
423: void *data = pmm_malloc(lowzone, handle, size, align);
424: if (data)
425: return (u32)data;
426: return (u32)pmm_malloc(highzone, handle, size, align);
427: }
428: }
429: }
430:
431: // PMM - find
432: static u32
433: handle_pmm01(u16 *args)
434: {
435: u32 handle = *(u32*)&args[1];
436: dprintf(3, "pmm01: handle=%x\n", handle);
437: if (handle == PMM_DEFAULT_HANDLE)
438: return 0;
439: return (u32)pmm_find(handle);
440: }
441:
442: // PMM - deallocate
443: static u32
444: handle_pmm02(u16 *args)
445: {
446: u32 buffer = *(u32*)&args[1];
447: dprintf(3, "pmm02: buffer=%x\n", buffer);
448: int ret = pmm_free((void*)buffer);
449: if (ret)
450: // Error
451: return 1;
452: return 0;
453: }
454:
455: static u32
456: handle_pmmXX(u16 *args)
457: {
458: return PMM_FUNCTION_NOT_SUPPORTED;
459: }
460:
461: u32 VISIBLE16
462: handle_pmm(u16 *args)
463: {
464: if (! CONFIG_PMM)
465: return PMM_FUNCTION_NOT_SUPPORTED;
466:
467: u16 arg1 = args[0];
468: dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1);
469:
470: switch (arg1) {
471: case 0x00: return handle_pmm00(args);
472: case 0x01: return handle_pmm01(args);
473: case 0x02: return handle_pmm02(args);
474: default: return handle_pmmXX(args);
475: }
476: }
477:
478: // romlayout.S
479: extern void entry_pmm();
480:
481: void
482: pmm_setup()
483: {
484: if (! CONFIG_PMM)
485: return;
486:
487: dprintf(3, "init PMM\n");
488:
489: PMMHEADER.signature = PMM_SIGNATURE;
490: PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
491: PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
492: }
493:
494: void
495: pmm_finalize()
496: {
497: if (! CONFIG_PMM)
498: return;
499:
500: dprintf(3, "finalize PMM\n");
501:
502: PMMHEADER.signature = 0;
503: PMMHEADER.entry_offset = 0;
504: }
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