| // Internal dynamic memory allocations. |
| // |
| // Copyright (C) 2009-2013 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "biosvar.h" // GET_BDA |
| #include "config.h" // BUILD_BIOS_ADDR |
| #include "list.h" // hlist_node |
| #include "malloc.h" // _malloc |
| #include "memmap.h" // struct e820entry |
| #include "output.h" // dprintf |
| #include "stacks.h" // wait_preempt |
| #include "std/optionrom.h" // OPTION_ROM_ALIGN |
| #include "string.h" // memset |
| |
| // Information on a reserved area. |
| struct allocinfo_s { |
| struct hlist_node node; |
| void *data, *dataend, *allocend; |
| }; |
| |
| // Information on a tracked memory allocation. |
| struct allocdetail_s { |
| struct allocinfo_s detailinfo; |
| struct allocinfo_s datainfo; |
| u32 handle; |
| }; |
| |
| // The various memory zones. |
| struct zone_s { |
| struct hlist_head head; |
| }; |
| |
| struct zone_s ZoneLow VARVERIFY32INIT, ZoneHigh VARVERIFY32INIT; |
| struct zone_s ZoneFSeg VARVERIFY32INIT; |
| struct zone_s ZoneTmpLow VARVERIFY32INIT, ZoneTmpHigh VARVERIFY32INIT; |
| |
| static struct zone_s *Zones[] VARVERIFY32INIT = { |
| &ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh |
| }; |
| |
| |
| /**************************************************************** |
| * low-level memory reservations |
| ****************************************************************/ |
| |
| // Find and reserve space from a given zone |
| static void * |
| allocSpace(struct zone_s *zone, u32 size, u32 align, struct allocinfo_s *fill) |
| { |
| struct allocinfo_s *info; |
| hlist_for_each_entry(info, &zone->head, node) { |
| void *dataend = info->dataend; |
| void *allocend = info->allocend; |
| void *newallocend = (void*)ALIGN_DOWN((u32)allocend - size, align); |
| if (newallocend >= dataend && newallocend <= allocend) { |
| // Found space - now reserve it. |
| if (!fill) |
| fill = newallocend; |
| fill->data = newallocend; |
| fill->dataend = newallocend + size; |
| fill->allocend = allocend; |
| |
| info->allocend = newallocend; |
| hlist_add_before(&fill->node, &info->node); |
| return newallocend; |
| } |
| } |
| return NULL; |
| } |
| |
| // Release space allocated with allocSpace() |
| static void |
| freeSpace(struct allocinfo_s *info) |
| { |
| struct allocinfo_s *next = container_of_or_null( |
| info->node.next, struct allocinfo_s, node); |
| if (next && next->allocend == info->data) |
| next->allocend = info->allocend; |
| hlist_del(&info->node); |
| } |
| |
| // Add new memory to a zone |
| static void |
| addSpace(struct zone_s *zone, void *start, void *end) |
| { |
| // Find position to add space |
| struct allocinfo_s *info; |
| struct hlist_node **pprev; |
| hlist_for_each_entry_pprev(info, pprev, &zone->head, node) { |
| if (info->data < start) |
| break; |
| } |
| |
| // Add space using temporary allocation info. |
| struct allocdetail_s tempdetail; |
| tempdetail.datainfo.data = tempdetail.datainfo.dataend = start; |
| tempdetail.datainfo.allocend = end; |
| hlist_add(&tempdetail.datainfo.node, pprev); |
| |
| // Allocate final allocation info. |
| struct allocdetail_s *detail = allocSpace( |
| &ZoneTmpHigh, sizeof(*detail), MALLOC_MIN_ALIGN, NULL); |
| if (!detail) { |
| detail = allocSpace(&ZoneTmpLow, sizeof(*detail) |
| , MALLOC_MIN_ALIGN, NULL); |
| if (!detail) { |
| hlist_del(&tempdetail.datainfo.node); |
| warn_noalloc(); |
| return; |
| } |
| } |
| |
| // Replace temp alloc space with final alloc space |
| pprev = tempdetail.datainfo.node.pprev; |
| hlist_del(&tempdetail.datainfo.node); |
| memcpy(&detail->datainfo, &tempdetail.datainfo, sizeof(detail->datainfo)); |
| detail->handle = MALLOC_DEFAULT_HANDLE; |
| hlist_add(&detail->datainfo.node, pprev); |
| } |
| |
| // Search all zones for an allocation obtained from allocSpace() |
| static struct allocinfo_s * |
| findAlloc(void *data) |
| { |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct allocinfo_s *info; |
| hlist_for_each_entry(info, &Zones[i]->head, node) { |
| if (info->data == data) |
| return info; |
| } |
| } |
| return NULL; |
| } |
| |
| // Return the last sentinal node of a zone |
| static struct allocinfo_s * |
| findLast(struct zone_s *zone) |
| { |
| struct allocinfo_s *info, *last = NULL; |
| hlist_for_each_entry(info, &zone->head, node) { |
| last = info; |
| } |
| return last; |
| } |
| |
| |
| /**************************************************************** |
| * ebda movement |
| ****************************************************************/ |
| |
| // Move ebda |
| static int |
| relocate_ebda(u32 newebda, u32 oldebda, u8 ebda_size) |
| { |
| u32 lowram = GET_BDA(mem_size_kb) * 1024; |
| if (oldebda != lowram) |
| // EBDA isn't at end of ram - give up. |
| return -1; |
| |
| // Do copy |
| memmove((void*)newebda, (void*)oldebda, ebda_size * 1024); |
| |
| // Update indexes |
| dprintf(1, "ebda moved from %x to %x\n", oldebda, newebda); |
| SET_BDA(mem_size_kb, newebda / 1024); |
| SET_BDA(ebda_seg, FLATPTR_TO_SEG(newebda)); |
| return 0; |
| } |
| |
| // Support expanding the ZoneLow dynamically. |
| static void * |
| zonelow_expand(u32 size, u32 align, struct allocinfo_s *fill) |
| { |
| // Make sure to not move ebda while an optionrom is running. |
| if (unlikely(wait_preempt())) { |
| void *data = allocSpace(&ZoneLow, size, align, fill); |
| if (data) |
| return data; |
| } |
| |
| struct allocinfo_s *info = findLast(&ZoneLow); |
| if (!info) |
| return NULL; |
| u32 oldpos = (u32)info->allocend; |
| u32 newpos = ALIGN_DOWN(oldpos - size, align); |
| u32 bottom = (u32)info->dataend; |
| if (newpos >= bottom && newpos <= oldpos) |
| // Space already present. |
| return allocSpace(&ZoneLow, size, align, fill); |
| u16 ebda_seg = get_ebda_seg(); |
| u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0); |
| u8 ebda_size = GET_EBDA(ebda_seg, size); |
| u32 ebda_end = ebda_pos + ebda_size * 1024; |
| if (ebda_end != bottom) |
| // Something else is after ebda - can't use any existing space. |
| newpos = ALIGN_DOWN(ebda_end - size, align); |
| u32 newbottom = ALIGN_DOWN(newpos, 1024); |
| u32 newebda = ALIGN_DOWN(newbottom - ebda_size * 1024, 1024); |
| if (newebda < BUILD_EBDA_MINIMUM) |
| // Not enough space. |
| return NULL; |
| |
| // Move ebda |
| int ret = relocate_ebda(newebda, ebda_pos, ebda_size); |
| if (ret) |
| return NULL; |
| |
| // Update zone |
| if (ebda_end == bottom) { |
| info->data = (void*)newbottom; |
| info->dataend = (void*)newbottom; |
| } else |
| addSpace(&ZoneLow, (void*)newbottom, (void*)ebda_end); |
| |
| return allocSpace(&ZoneLow, size, align, fill); |
| } |
| |
| |
| /**************************************************************** |
| * tracked memory allocations |
| ****************************************************************/ |
| |
| // Allocate memory from the given zone and track it as a PMM allocation |
| void * __malloc |
| _malloc(struct zone_s *zone, u32 handle, u32 size, u32 align) |
| { |
| ASSERT32FLAT(); |
| if (!size) |
| return NULL; |
| |
| // Find and reserve space for bookkeeping. |
| struct allocdetail_s *detail = allocSpace( |
| &ZoneTmpHigh, sizeof(*detail), MALLOC_MIN_ALIGN, NULL); |
| if (!detail) { |
| detail = allocSpace(&ZoneTmpLow, sizeof(*detail) |
| , MALLOC_MIN_ALIGN, NULL); |
| if (!detail) |
| return NULL; |
| } |
| |
| // Find and reserve space for main allocation |
| void *data = allocSpace(zone, size, align, &detail->datainfo); |
| if (!CONFIG_MALLOC_UPPERMEMORY && !data && zone == &ZoneLow) |
| data = zonelow_expand(size, align, &detail->datainfo); |
| if (!data) { |
| freeSpace(&detail->detailinfo); |
| return NULL; |
| } |
| |
| dprintf(8, "_malloc zone=%p handle=%x size=%d align=%x ret=%p (detail=%p)\n" |
| , zone, handle, size, align, data, detail); |
| detail->handle = handle; |
| |
| return data; |
| } |
| |
| // Free a data block allocated with _malloc |
| int |
| _free(void *data) |
| { |
| ASSERT32FLAT(); |
| struct allocinfo_s *info = findAlloc(data); |
| if (!info || data == (void*)info || data == info->dataend) |
| return -1; |
| struct allocdetail_s *detail = container_of( |
| info, struct allocdetail_s, datainfo); |
| dprintf(8, "_free %p (detail=%p)\n", data, detail); |
| freeSpace(info); |
| freeSpace(&detail->detailinfo); |
| return 0; |
| } |
| |
| // Find the amount of free space in a given zone. |
| u32 |
| malloc_getspace(struct zone_s *zone) |
| { |
| // XXX - doesn't account for ZoneLow being able to grow. |
| // XXX - results not reliable when CONFIG_THREAD_OPTIONROMS |
| u32 maxspace = 0; |
| struct allocinfo_s *info; |
| hlist_for_each_entry(info, &zone->head, node) { |
| u32 space = info->allocend - info->dataend; |
| if (space > maxspace) |
| maxspace = space; |
| } |
| |
| if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow) |
| return maxspace; |
| // Account for space needed for PMM tracking. |
| u32 reserve = ALIGN(sizeof(struct allocdetail_s), MALLOC_MIN_ALIGN); |
| if (maxspace <= reserve) |
| return 0; |
| return maxspace - reserve; |
| } |
| |
| // Find the data block allocated with _malloc with a given handle. |
| void * |
| malloc_find(u32 handle) |
| { |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct allocinfo_s *info; |
| hlist_for_each_entry(info, &Zones[i]->head, node) { |
| if (info->data != (void*)info) |
| continue; |
| struct allocdetail_s *detail = container_of( |
| info, struct allocdetail_s, detailinfo); |
| if (detail->handle == handle) |
| return detail->datainfo.data; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| /**************************************************************** |
| * 0xc0000-0xf0000 management |
| ****************************************************************/ |
| |
| static u32 RomEnd = BUILD_ROM_START; |
| static struct allocinfo_s *RomBase; |
| |
| #define OPROM_HEADER_RESERVE 16 |
| |
| // Return the maximum memory position option roms may use. |
| u32 |
| rom_get_max(void) |
| { |
| if (CONFIG_MALLOC_UPPERMEMORY) |
| return ALIGN_DOWN((u32)RomBase->allocend - OPROM_HEADER_RESERVE |
| , OPTION_ROM_ALIGN); |
| extern u8 code32init_end[]; |
| u32 end = (u32)code32init_end; |
| return end > BUILD_BIOS_ADDR ? BUILD_BIOS_ADDR : end; |
| } |
| |
| // Return the end of the last deployed option rom. |
| u32 |
| rom_get_last(void) |
| { |
| return RomEnd; |
| } |
| |
| // Request space for an optionrom in 0xc0000-0xf0000 area. |
| struct rom_header * |
| rom_reserve(u32 size) |
| { |
| u32 newend = ALIGN(RomEnd + size, OPTION_ROM_ALIGN); |
| if (newend > rom_get_max()) |
| return NULL; |
| if (CONFIG_MALLOC_UPPERMEMORY) { |
| if (newend < (u32)zonelow_base) |
| newend = (u32)zonelow_base; |
| RomBase->data = RomBase->dataend = (void*)newend + OPROM_HEADER_RESERVE; |
| } |
| return (void*)RomEnd; |
| } |
| |
| // Confirm space as in use by an optionrom. |
| int |
| rom_confirm(u32 size) |
| { |
| void *new = rom_reserve(size); |
| if (!new) { |
| warn_noalloc(); |
| return -1; |
| } |
| RomEnd = ALIGN(RomEnd + size, OPTION_ROM_ALIGN); |
| return 0; |
| } |
| |
| |
| /**************************************************************** |
| * Setup |
| ****************************************************************/ |
| |
| void |
| malloc_preinit(void) |
| { |
| ASSERT32FLAT(); |
| dprintf(3, "malloc preinit\n"); |
| |
| // Don't declare any memory between 0xa0000 and 0x100000 |
| add_e820(BUILD_LOWRAM_END, BUILD_BIOS_ADDR-BUILD_LOWRAM_END, E820_HOLE); |
| |
| // Mark known areas as reserved. |
| add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED); |
| |
| // Populate temp high ram |
| u32 highram = 0; |
| int i; |
| for (i=e820_count-1; i>=0; i--) { |
| struct e820entry *en = &e820_list[i]; |
| u64 end = en->start + en->size; |
| if (end < 1024*1024) |
| break; |
| if (en->type != E820_RAM || end > 0xffffffff) |
| continue; |
| u32 s = en->start, e = end; |
| if (!highram) { |
| u32 newe = ALIGN_DOWN(e - BUILD_MAX_HIGHTABLE, MALLOC_MIN_ALIGN); |
| if (newe <= e && newe >= s) { |
| highram = newe; |
| e = newe; |
| } |
| } |
| addSpace(&ZoneTmpHigh, (void*)s, (void*)e); |
| } |
| |
| // Populate regions |
| addSpace(&ZoneTmpLow, (void*)BUILD_STACK_ADDR, (void*)BUILD_EBDA_MINIMUM); |
| if (highram) { |
| addSpace(&ZoneHigh, (void*)highram |
| , (void*)highram + BUILD_MAX_HIGHTABLE); |
| add_e820(highram, BUILD_MAX_HIGHTABLE, E820_RESERVED); |
| } |
| } |
| |
| void |
| csm_malloc_preinit(u32 low_pmm, u32 low_pmm_size, u32 hi_pmm, u32 hi_pmm_size) |
| { |
| ASSERT32FLAT(); |
| |
| if (hi_pmm_size > BUILD_MAX_HIGHTABLE) { |
| void *hi_pmm_end = (void *)hi_pmm + hi_pmm_size; |
| addSpace(&ZoneTmpHigh, (void *)hi_pmm, hi_pmm_end - BUILD_MAX_HIGHTABLE); |
| addSpace(&ZoneHigh, hi_pmm_end - BUILD_MAX_HIGHTABLE, hi_pmm_end); |
| } else { |
| addSpace(&ZoneTmpHigh, (void *)hi_pmm, (void *)hi_pmm + hi_pmm_size); |
| } |
| addSpace(&ZoneTmpLow, (void *)low_pmm, (void *)low_pmm + low_pmm_size); |
| } |
| |
| u32 LegacyRamSize VARFSEG; |
| |
| // Calculate the maximum ramsize (less than 4gig) from e820 map. |
| static void |
| calcRamSize(void) |
| { |
| u32 rs = 0; |
| int i; |
| for (i=e820_count-1; i>=0; i--) { |
| struct e820entry *en = &e820_list[i]; |
| u64 end = en->start + en->size; |
| u32 type = en->type; |
| if (end <= 0xffffffff && (type == E820_ACPI || type == E820_RAM)) { |
| rs = end; |
| break; |
| } |
| } |
| LegacyRamSize = rs >= 1024*1024 ? rs : 1024*1024; |
| } |
| |
| // Update pointers after code relocation. |
| void |
| malloc_init(void) |
| { |
| ASSERT32FLAT(); |
| dprintf(3, "malloc init\n"); |
| |
| if (CONFIG_RELOCATE_INIT) { |
| // Fixup malloc pointers after relocation |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct zone_s *zone = Zones[i]; |
| if (zone->head.first) |
| zone->head.first->pprev = &zone->head.first; |
| } |
| } |
| |
| // Initialize low-memory region |
| extern u8 varlow_start[], varlow_end[], final_varlow_start[]; |
| memmove(final_varlow_start, varlow_start, varlow_end - varlow_start); |
| if (CONFIG_MALLOC_UPPERMEMORY) { |
| addSpace(&ZoneLow, zonelow_base + OPROM_HEADER_RESERVE |
| , final_varlow_start); |
| RomBase = findLast(&ZoneLow); |
| } else { |
| addSpace(&ZoneLow, (void*)ALIGN_DOWN((u32)final_varlow_start, 1024) |
| , final_varlow_start); |
| } |
| |
| // Add space available in f-segment to ZoneFSeg |
| extern u8 zonefseg_start[], zonefseg_end[]; |
| memset(zonefseg_start, 0, zonefseg_end - zonefseg_start); |
| addSpace(&ZoneFSeg, zonefseg_start, zonefseg_end); |
| |
| calcRamSize(); |
| } |
| |
| void |
| malloc_prepboot(void) |
| { |
| ASSERT32FLAT(); |
| dprintf(3, "malloc finalize\n"); |
| |
| u32 base = rom_get_max(); |
| memset((void*)RomEnd, 0, base-RomEnd); |
| if (CONFIG_MALLOC_UPPERMEMORY) { |
| // Place an optionrom signature around used low mem area. |
| struct rom_header *dummyrom = (void*)base; |
| dummyrom->signature = OPTION_ROM_SIGNATURE; |
| int size = (BUILD_BIOS_ADDR - base) / 512; |
| dummyrom->size = (size > 255) ? 255 : size; |
| } |
| |
| // Reserve more low-mem if needed. |
| u32 endlow = GET_BDA(mem_size_kb)*1024; |
| add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED); |
| |
| // Clear unused f-seg ram. |
| struct allocinfo_s *info = findLast(&ZoneFSeg); |
| memset(info->dataend, 0, info->allocend - info->dataend); |
| dprintf(1, "Space available for UMB: %x-%x, %x-%x\n" |
| , RomEnd, base, (u32)info->dataend, (u32)info->allocend); |
| |
| // Give back unused high ram. |
| info = findLast(&ZoneHigh); |
| if (info) { |
| u32 giveback = ALIGN_DOWN(info->allocend - info->dataend, PAGE_SIZE); |
| add_e820((u32)info->dataend, giveback, E820_RAM); |
| dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback); |
| } |
| |
| calcRamSize(); |
| } |