--- /dev/null
+// 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 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;
+ }
+ detail->handle = MALLOC_DEFAULT_HANDLE;
+
+ // 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 size=%d align=%x ret=%p (detail=%p)\n"
+ , zone, size, align, data, detail);
+
+ 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;
+}
+
+// Set a handle associated with an allocation.
+void
+malloc_sethandle(void *data, u32 handle)
+{
+ ASSERT32FLAT();
+ struct allocinfo_s *info = findAlloc(data);
+ if (!info || data == (void*)info || data == info->dataend)
+ return;
+ struct allocdetail_s *detail = container_of(
+ info, struct allocdetail_s, datainfo);
+ detail->handle = handle;
+}
+
+// Find the data block allocated with _malloc with a given handle.
+void *
+malloc_findhandle(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 final_readonly_start[];
+ return (u32)final_readonly_start;
+}
+
+// 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();
+}
Code Review / kvmfornfv.git / blobdiff