1 files changed, 561 insertions, 0 deletions

diff --git a/roms/seabios/src/malloc.c b/roms/seabios/src/malloc.c
new file mode 100644
index 000000000..3733855ca
--- /dev/null
+++ b/roms/seabios/src/malloc.c
@@ -0,0 +1,561 @@
+// 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 "e820map.h" // struct e820entry
+#include "list.h" // hlist_node
+#include "malloc.h" // _malloc
+#include "memmap.h" // PAGE_SIZE
+#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;
+    u32 range_start, range_end, alloc_size;
+};
+
+// 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 u32
+alloc_new(struct zone_s *zone, u32 size, u32 align, struct allocinfo_s *fill)
+{
+    struct allocinfo_s *info;
+    hlist_for_each_entry(info, &zone->head, node) {
+        u32 alloc_end = info->range_start + info->alloc_size;
+        u32 range_end = info->range_end;
+        u32 new_range_end = ALIGN_DOWN(range_end - size, align);
+        if (new_range_end >= alloc_end && new_range_end <= range_end) {
+            // Found space - now reserve it.
+            fill->range_start = new_range_end;
+            fill->range_end = range_end;
+            fill->alloc_size = size;
+
+            info->range_end = new_range_end;
+            hlist_add_before(&fill->node, &info->node);
+            return new_range_end;
+        }
+    }
+    return 0;
+}
+
+// Reserve space for a 'struct allocdetail_s' and fill
+static struct allocdetail_s *
+alloc_new_detail(struct allocdetail_s *temp)
+{
+    u32 detail_addr = alloc_new(&ZoneTmpHigh, sizeof(struct allocdetail_s)
+                                , MALLOC_MIN_ALIGN, &temp->detailinfo);
+    if (!detail_addr) {
+        detail_addr = alloc_new(&ZoneTmpLow, sizeof(struct allocdetail_s)
+                                , MALLOC_MIN_ALIGN, &temp->detailinfo);
+        if (!detail_addr) {
+            warn_noalloc();
+            return NULL;
+        }
+    }
+    struct allocdetail_s *detail = memremap(detail_addr, sizeof(*detail));
+
+    // Fill final 'detail' allocation from data in 'temp'
+    memcpy(detail, temp, sizeof(*detail));
+    hlist_replace(&temp->detailinfo.node, &detail->detailinfo.node);
+    hlist_replace(&temp->datainfo.node, &detail->datainfo.node);
+    return detail;
+}
+
+// Add new memory to a zone
+static void
+alloc_add(struct zone_s *zone, u32 start, u32 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->range_start < start)
+            break;
+    }
+
+    // Add space using temporary allocation info.
+    struct allocdetail_s tempdetail;
+    tempdetail.handle = MALLOC_DEFAULT_HANDLE;
+    tempdetail.datainfo.range_start = start;
+    tempdetail.datainfo.range_end = end;
+    tempdetail.datainfo.alloc_size = 0;
+    hlist_add(&tempdetail.datainfo.node, pprev);
+
+    // Allocate final allocation info.
+    struct allocdetail_s *detail = alloc_new_detail(&tempdetail);
+    if (!detail)
+        hlist_del(&tempdetail.datainfo.node);
+}
+
+// Release space allocated with alloc_new()
+static void
+alloc_free(struct allocinfo_s *info)
+{
+    struct allocinfo_s *next = container_of_or_null(
+        info->node.next, struct allocinfo_s, node);
+    if (next && next->range_end == info->range_start)
+        next->range_end = info->range_end;
+    hlist_del(&info->node);
+}
+
+// Search all zones for an allocation obtained from alloc_new()
+static struct allocinfo_s *
+alloc_find(u32 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->range_start == data)
+                return info;
+        }
+    }
+    return NULL;
+}
+
+// Find the lowest memory range added by alloc_add()
+static struct allocinfo_s *
+alloc_find_lowest(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 u32
+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())) {
+        u32 data = alloc_new(&ZoneLow, size, align, fill);
+        if (data)
+            return data;
+    }
+
+    struct allocinfo_s *info = alloc_find_lowest(&ZoneLow);
+    if (!info)
+        return 0;
+    u32 oldpos = info->range_end;
+    u32 newpos = ALIGN_DOWN(oldpos - size, align);
+    u32 bottom = info->range_start + info->alloc_size;
+    if (newpos >= bottom && newpos <= oldpos)
+        // Space already present.
+        return alloc_new(&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 0;
+
+    // Move ebda
+    int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
+    if (ret)
+        return 0;
+
+    // Update zone
+    if (ebda_end == bottom)
+        info->range_start = newbottom;
+    else
+        alloc_add(&ZoneLow, newbottom, ebda_end);
+
+    return alloc_new(&ZoneLow, size, align, fill);
+}
+
+
+/****************************************************************
+ * tracked memory allocations
+ ****************************************************************/
+
+// Allocate physical memory from the given zone and track it as a PMM allocation
+u32
+malloc_palloc(struct zone_s *zone, u32 size, u32 align)
+{
+    ASSERT32FLAT();
+    if (!size)
+        return 0;
+
+    // Find and reserve space for main allocation
+    struct allocdetail_s tempdetail;
+    tempdetail.handle = MALLOC_DEFAULT_HANDLE;
+    u32 data = alloc_new(zone, size, align, &tempdetail.datainfo);
+    if (!CONFIG_MALLOC_UPPERMEMORY && !data && zone == &ZoneLow)
+        data = zonelow_expand(size, align, &tempdetail.datainfo);
+    if (!data)
+        return 0;
+
+    // Find and reserve space for bookkeeping.
+    struct allocdetail_s *detail = alloc_new_detail(&tempdetail);
+    if (!detail) {
+        alloc_free(&tempdetail.datainfo);
+        return 0;
+    }
+
+    dprintf(8, "phys_alloc zone=%p size=%d align=%x ret=%x (detail=%p)\n"
+            , zone, size, align, data, detail);
+
+    return data;
+}
+
+// Allocate virtual memory from the given zone
+void * __malloc
+_malloc(struct zone_s *zone, u32 size, u32 align)
+{
+    return memremap(malloc_palloc(zone, size, align), size);
+}
+
+// Free a data block allocated with phys_alloc
+int
+malloc_pfree(u32 data)
+{
+    ASSERT32FLAT();
+    struct allocinfo_s *info = alloc_find(data);
+    if (!info || data == virt_to_phys(info) || !info->alloc_size)
+        return -1;
+    struct allocdetail_s *detail = container_of(
+        info, struct allocdetail_s, datainfo);
+    dprintf(8, "phys_free %x (detail=%p)\n", data, detail);
+    alloc_free(info);
+    alloc_free(&detail->detailinfo);
+    return 0;
+}
+
+void
+free(void *data)
+{
+    if (!data)
+        return;
+    int ret = malloc_pfree(virt_to_phys(data));
+    if (ret)
+        warn_internalerror();
+}
+
+// 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->range_end - info->range_start - info->alloc_size;
+        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(u32 data, u32 handle)
+{
+    ASSERT32FLAT();
+    struct allocinfo_s *info = alloc_find(data);
+    if (!info || data == virt_to_phys(info) || !info->alloc_size)
+        return;
+    struct allocdetail_s *detail = container_of(
+        info, struct allocdetail_s, datainfo);
+    detail->handle = handle;
+}
+
+// Find the data block allocated with phys_alloc with a given handle.
+u32
+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->range_start != virt_to_phys(info))
+                continue;
+            struct allocdetail_s *detail = container_of(
+                info, struct allocdetail_s, detailinfo);
+            if (detail->handle == handle)
+                return detail->datainfo.range_start;
+        }
+    }
+    return 0;
+}
+
+
+/****************************************************************
+ * 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(RomBase->range_end - OPROM_HEADER_RESERVE
+                          , OPTION_ROM_ALIGN);
+    return SYMBOL(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 < SYMBOL(zonelow_base))
+            newend = SYMBOL(zonelow_base);
+        RomBase->range_start = 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
+    e820_remove(BUILD_LOWRAM_END, BUILD_BIOS_ADDR-BUILD_LOWRAM_END);
+
+    // Mark known areas as reserved.
+    e820_add(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;
+            }
+        }
+        alloc_add(&ZoneTmpHigh, s, e);
+    }
+
+    // Populate regions
+    alloc_add(&ZoneTmpLow, BUILD_STACK_ADDR, BUILD_EBDA_MINIMUM);
+    if (highram) {
+        alloc_add(&ZoneHigh, highram, highram + BUILD_MAX_HIGHTABLE);
+        e820_add(highram, BUILD_MAX_HIGHTABLE, E820_RESERVED);
+    }
+}
+
+void
+malloc_csm_preinit(u32 low_pmm, u32 low_pmm_size, u32 hi_pmm, u32 hi_pmm_size)
+{
+    ASSERT32FLAT();
+
+    if (hi_pmm_size > BUILD_MAX_HIGHTABLE) {
+        u32 hi_pmm_end = hi_pmm + hi_pmm_size;
+        alloc_add(&ZoneTmpHigh, hi_pmm, hi_pmm_end - BUILD_MAX_HIGHTABLE);
+        alloc_add(&ZoneHigh, hi_pmm_end - BUILD_MAX_HIGHTABLE, hi_pmm_end);
+    } else {
+        alloc_add(&ZoneTmpHigh, hi_pmm, hi_pmm + hi_pmm_size);
+    }
+    alloc_add(&ZoneTmpLow, low_pmm, 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
+    memmove(VSYMBOL(final_varlow_start), VSYMBOL(varlow_start)
+            , SYMBOL(varlow_end) - SYMBOL(varlow_start));
+    if (CONFIG_MALLOC_UPPERMEMORY) {
+        alloc_add(&ZoneLow, SYMBOL(zonelow_base) + OPROM_HEADER_RESERVE
+                  , SYMBOL(final_varlow_start));
+        RomBase = alloc_find_lowest(&ZoneLow);
+    } else {
+        alloc_add(&ZoneLow, ALIGN_DOWN(SYMBOL(final_varlow_start), 1024)
+                  , SYMBOL(final_varlow_start));
+    }
+
+    // Add space available in f-segment to ZoneFSeg
+    memset(VSYMBOL(zonefseg_start), 0
+           , SYMBOL(zonefseg_end) - SYMBOL(zonefseg_start));
+    alloc_add(&ZoneFSeg, SYMBOL(zonefseg_start), SYMBOL(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;
+    e820_add(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
+
+    // Clear unused f-seg ram.
+    struct allocinfo_s *info = alloc_find_lowest(&ZoneFSeg);
+    u32 size = info->range_end - info->range_start;
+    memset(memremap(info->range_start, size), 0, size);
+    dprintf(1, "Space available for UMB: %x-%x, %x-%x\n"
+            , RomEnd, base, info->range_start, info->range_end);
+
+    // Give back unused high ram.
+    info = alloc_find_lowest(&ZoneHigh);
+    if (info) {
+        u32 giveback = ALIGN_DOWN(info->range_end-info->range_start, PAGE_SIZE);
+        e820_add(info->range_start, giveback, E820_RAM);
+        dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
+    }
+
+    calcRamSize();
+}