| // Post memory manager (PMM) calls |
| // |
| // Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "util.h" // checksum |
| #include "config.h" // BUILD_BIOS_ADDR |
| #include "memmap.h" // struct e820entry |
| #include "farptr.h" // GET_FARVAR |
| #include "biosvar.h" // GET_BDA |
| #include "optionroms.h" // OPTION_ROM_ALIGN |
| |
| // Information on a reserved area. |
| struct allocinfo_s { |
| struct allocinfo_s *next, **pprev; |
| 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 allocinfo_s *info; |
| }; |
| |
| struct zone_s ZoneLow, ZoneHigh, ZoneFSeg, ZoneTmpLow, ZoneTmpHigh; |
| |
| static struct zone_s *Zones[] = { |
| &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; |
| for (info = zone->info; info; info = info->next) { |
| 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. |
| struct allocinfo_s **pprev = info->pprev; |
| if (!fill) |
| fill = newallocend; |
| fill->next = info; |
| fill->pprev = pprev; |
| fill->data = newallocend; |
| fill->dataend = newallocend + size; |
| fill->allocend = allocend; |
| |
| info->allocend = newallocend; |
| info->pprev = &fill->next; |
| *pprev = fill; |
| return newallocend; |
| } |
| } |
| return NULL; |
| } |
| |
| // Release space allocated with allocSpace() |
| static void |
| freeSpace(struct allocinfo_s *info) |
| { |
| struct allocinfo_s *next = info->next; |
| struct allocinfo_s **pprev = info->pprev; |
| *pprev = next; |
| if (next) { |
| if (next->allocend == info->data) |
| next->allocend = info->allocend; |
| next->pprev = pprev; |
| } |
| } |
| |
| // 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 **pprev = &zone->info, *info; |
| for (;;) { |
| info = *pprev; |
| if (!info || info->data < start) |
| break; |
| pprev = &info->next; |
| } |
| |
| // Add space using temporary allocation info. |
| struct allocdetail_s tempdetail; |
| tempdetail.datainfo.next = info; |
| tempdetail.datainfo.pprev = pprev; |
| tempdetail.datainfo.data = tempdetail.datainfo.dataend = start; |
| tempdetail.datainfo.allocend = end; |
| *pprev = &tempdetail.datainfo; |
| if (info) |
| info->pprev = &tempdetail.datainfo.next; |
| |
| // 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) { |
| *tempdetail.datainfo.pprev = tempdetail.datainfo.next; |
| if (tempdetail.datainfo.next) |
| tempdetail.datainfo.next->pprev = tempdetail.datainfo.pprev; |
| warn_noalloc(); |
| return; |
| } |
| } |
| |
| // Replace temp alloc space with final alloc space |
| memcpy(&detail->datainfo, &tempdetail.datainfo, sizeof(detail->datainfo)); |
| detail->handle = PMM_DEFAULT_HANDLE; |
| |
| *tempdetail.datainfo.pprev = &detail->datainfo; |
| if (tempdetail.datainfo.next) |
| tempdetail.datainfo.next->pprev = &detail->datainfo.next; |
| } |
| |
| // 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 zone_s *zone = Zones[i]; |
| struct allocinfo_s *info; |
| for (info = zone->info; info; info = info->next) |
| 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 = zone->info; |
| if (!info) |
| return NULL; |
| for (;;) { |
| struct allocinfo_s *next = info->next; |
| if (!next) |
| return info; |
| info = next; |
| } |
| } |
| |
| |
| /**************************************************************** |
| * 0xc0000-0xf0000 management |
| ****************************************************************/ |
| |
| static u32 RomEnd = BUILD_ROM_START; |
| static struct allocinfo_s *RomBase; |
| |
| #define OPROM_HEADER_RESERVE 16 |
| |
| // Return the memory position up to which roms may be located. |
| u32 |
| rom_get_top(void) |
| { |
| return ALIGN_DOWN((u32)RomBase->allocend - OPROM_HEADER_RESERVE |
| , OPTION_ROM_ALIGN); |
| } |
| |
| // Return the end of the last deployed 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) + OPROM_HEADER_RESERVE; |
| if (newend > (u32)RomBase->allocend) |
| return NULL; |
| if (newend < (u32)datalow_base + OPROM_HEADER_RESERVE) |
| newend = (u32)datalow_base + OPROM_HEADER_RESERVE; |
| RomBase->data = RomBase->dataend = (void*)newend; |
| 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_setup(void) |
| { |
| ASSERT32FLAT(); |
| dprintf(3, "malloc setup\n"); |
| |
| // 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 - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN); |
| if (newe <= e && newe >= s) { |
| highram = newe; |
| e = newe; |
| } |
| } |
| addSpace(&ZoneTmpHigh, (void*)s, (void*)e); |
| } |
| |
| // Populate other regions |
| addSpace(&ZoneTmpLow, (void*)BUILD_STACK_ADDR, (void*)BUILD_EBDA_MINIMUM); |
| addSpace(&ZoneFSeg, BiosTableSpace, &BiosTableSpace[CONFIG_MAX_BIOSTABLE]); |
| extern u8 final_datalow_start[]; |
| addSpace(&ZoneLow, datalow_base + OPROM_HEADER_RESERVE, final_datalow_start); |
| RomBase = findLast(&ZoneLow); |
| if (highram) { |
| addSpace(&ZoneHigh, (void*)highram |
| , (void*)highram + CONFIG_MAX_HIGHTABLE); |
| add_e820(highram, CONFIG_MAX_HIGHTABLE, E820_RESERVED); |
| } |
| } |
| |
| // Update pointers after code relocation. |
| void |
| malloc_fixupreloc(void) |
| { |
| ASSERT32FLAT(); |
| if (!CONFIG_RELOCATE_INIT) |
| return; |
| dprintf(3, "malloc fixup reloc\n"); |
| |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct zone_s *zone = Zones[i]; |
| if (zone->info) |
| zone->info->pprev = &zone->info; |
| } |
| |
| // Add space free'd during relocation in f-segment to ZoneFSeg |
| extern u8 code32init_end[]; |
| if ((u32)code32init_end > BUILD_BIOS_ADDR) { |
| memset((void*)BUILD_BIOS_ADDR, 0, (u32)code32init_end - BUILD_BIOS_ADDR); |
| addSpace(&ZoneFSeg, (void*)BUILD_BIOS_ADDR, code32init_end); |
| } |
| } |
| |
| void |
| malloc_finalize(void) |
| { |
| ASSERT32FLAT(); |
| dprintf(3, "malloc finalize\n"); |
| |
| // Place an optionrom signature around used low mem area. |
| u32 base = rom_get_top(); |
| struct rom_header *dummyrom = (void*)base; |
| dummyrom->signature = OPTION_ROM_SIGNATURE; |
| int size = (BUILD_BIOS_ADDR - base) / 512; |
| dummyrom->size = (size > 255) ? 255 : size; |
| memset((void*)RomEnd, 0, base-RomEnd); |
| dprintf(1, "Space available for UMB: %08x-%08x\n", RomEnd, base); |
| |
| // Clear unused f-seg ram. |
| struct allocinfo_s *info = findLast(&ZoneFSeg); |
| memset(info->dataend, 0, info->allocend - info->dataend); |
| |
| // 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); |
| } |
| } |
| |
| |
| /**************************************************************** |
| * tracked memory allocations |
| ****************************************************************/ |
| |
| // Allocate memory from the given zone and track it as a PMM allocation |
| void * __malloc |
| pmm_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 (!data) { |
| freeSpace(&detail->detailinfo); |
| return NULL; |
| } |
| |
| dprintf(8, "pmm_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 pmm_malloc |
| int |
| pmm_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, "pmm_free %p (detail=%p)\n", data, detail); |
| freeSpace(info); |
| freeSpace(&detail->detailinfo); |
| return 0; |
| } |
| |
| // Find the amount of free space in a given zone. |
| static u32 |
| pmm_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; |
| for (info = zone->info; info; info = info->next) { |
| 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 pmm_malloc with a given handle. |
| static void * |
| pmm_find(u32 handle) |
| { |
| int i; |
| for (i=0; i<ARRAY_SIZE(Zones); i++) { |
| struct zone_s *zone = Zones[i]; |
| struct allocinfo_s *info; |
| for (info = zone->info; info; info = info->next) { |
| 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; |
| } |
| |
| |
| /**************************************************************** |
| * pmm interface |
| ****************************************************************/ |
| |
| struct pmmheader { |
| u32 signature; |
| u8 version; |
| u8 length; |
| u8 checksum; |
| struct segoff_s entry; |
| u8 reserved[5]; |
| } PACKED; |
| |
| extern struct pmmheader PMMHEADER; |
| |
| #define PMM_SIGNATURE 0x4d4d5024 // $PMM |
| |
| #if CONFIG_PMM |
| struct pmmheader PMMHEADER __aligned(16) VAR16EXPORT = { |
| .signature = PMM_SIGNATURE, |
| .version = 0x01, |
| .length = sizeof(PMMHEADER), |
| }; |
| #endif |
| |
| #define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff |
| |
| // PMM - allocate |
| static u32 |
| handle_pmm00(u16 *args) |
| { |
| u32 length = *(u32*)&args[1], handle = *(u32*)&args[3]; |
| u16 flags = args[5]; |
| dprintf(3, "pmm00: length=%x handle=%x flags=%x\n" |
| , length, handle, flags); |
| struct zone_s *lowzone = &ZoneTmpLow, *highzone = &ZoneTmpHigh; |
| if (flags & 8) { |
| // Permanent memory request. |
| lowzone = &ZoneLow; |
| highzone = &ZoneHigh; |
| } |
| if (!length) { |
| // Memory size request |
| switch (flags & 3) { |
| default: |
| case 0: |
| return 0; |
| case 1: |
| return pmm_getspace(lowzone); |
| case 2: |
| return pmm_getspace(highzone); |
| case 3: { |
| u32 spacelow = pmm_getspace(lowzone); |
| u32 spacehigh = pmm_getspace(highzone); |
| if (spacelow > spacehigh) |
| return spacelow; |
| return spacehigh; |
| } |
| } |
| } |
| u32 size = length * 16; |
| if ((s32)size <= 0) |
| return 0; |
| u32 align = MALLOC_MIN_ALIGN; |
| if (flags & 4) { |
| align = 1<<__ffs(size); |
| if (align < MALLOC_MIN_ALIGN) |
| align = MALLOC_MIN_ALIGN; |
| } |
| switch (flags & 3) { |
| default: |
| case 0: |
| return 0; |
| case 1: |
| return (u32)pmm_malloc(lowzone, handle, size, align); |
| case 2: |
| return (u32)pmm_malloc(highzone, handle, size, align); |
| case 3: { |
| void *data = pmm_malloc(lowzone, handle, size, align); |
| if (data) |
| return (u32)data; |
| return (u32)pmm_malloc(highzone, handle, size, align); |
| } |
| } |
| } |
| |
| // PMM - find |
| static u32 |
| handle_pmm01(u16 *args) |
| { |
| u32 handle = *(u32*)&args[1]; |
| dprintf(3, "pmm01: handle=%x\n", handle); |
| if (handle == PMM_DEFAULT_HANDLE) |
| return 0; |
| return (u32)pmm_find(handle); |
| } |
| |
| // PMM - deallocate |
| static u32 |
| handle_pmm02(u16 *args) |
| { |
| u32 buffer = *(u32*)&args[1]; |
| dprintf(3, "pmm02: buffer=%x\n", buffer); |
| int ret = pmm_free((void*)buffer); |
| if (ret) |
| // Error |
| return 1; |
| return 0; |
| } |
| |
| static u32 |
| handle_pmmXX(u16 *args) |
| { |
| return PMM_FUNCTION_NOT_SUPPORTED; |
| } |
| |
| u32 VISIBLE32INIT |
| handle_pmm(u16 *args) |
| { |
| ASSERT32FLAT(); |
| if (! CONFIG_PMM) |
| return PMM_FUNCTION_NOT_SUPPORTED; |
| |
| u16 arg1 = args[0]; |
| dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1); |
| |
| u32 ret; |
| switch (arg1) { |
| case 0x00: ret = handle_pmm00(args); break; |
| case 0x01: ret = handle_pmm01(args); break; |
| case 0x02: ret = handle_pmm02(args); break; |
| default: ret = handle_pmmXX(args); break; |
| } |
| |
| return ret; |
| } |
| |
| void |
| pmm_setup(void) |
| { |
| if (! CONFIG_PMM) |
| return; |
| |
| dprintf(3, "init PMM\n"); |
| |
| PMMHEADER.entry = FUNC16(entry_pmm); |
| PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER)); |
| } |
| |
| void |
| pmm_finalize(void) |
| { |
| if (! CONFIG_PMM) |
| return; |
| |
| dprintf(3, "finalize PMM\n"); |
| |
| PMMHEADER.signature = 0; |
| PMMHEADER.entry.segoff = 0; |
| } |