#include "config.h" // BUILD_BIOS_ADDR
#include "memmap.h" // find_high_area
#include "farptr.h" // GET_FARVAR
-#include "biosvar.h" // EBDA_SEGMENT_MINIMUM
+#include "biosvar.h" // GET_BDA
-/****************************************************************
- * malloc
- ****************************************************************/
-
-#if MODE16
+#if MODESEGMENT
// The 16bit pmm entry points runs in "big real" mode, and can
// therefore read/write to the 32bit malloc variables.
-#define GET_PMMVAR(var) GET_FARVAR(0, (var))
-#define SET_PMMVAR(var, val) SET_FARVAR(0, (var), (val))
+#define GET_PMMVAR(var) ({ \
+ SET_SEG(ES, 0); \
+ __GET_VAR("addr32 ", ES, (var)); })
+#define SET_PMMVAR(var, val) do { \
+ SET_SEG(ES, 0); \
+ __SET_VAR("addr32 ", ES, (var), (val)); \
+ } while (0)
#else
#define GET_PMMVAR(var) (var)
#define SET_PMMVAR(var, val) do { (var) = (val); } while (0)
u32 top, bottom, cur;
};
-struct zone_s ZoneLow VAR32VISIBLE, ZoneHigh VAR32VISIBLE;
-struct zone_s ZoneFSeg VAR32VISIBLE;
-struct zone_s ZoneTmpLow VAR32VISIBLE, ZoneTmpHigh VAR32VISIBLE;
+struct zone_s ZoneLow VAR32FLATVISIBLE, ZoneHigh VAR32FLATVISIBLE;
+struct zone_s ZoneFSeg VAR32FLATVISIBLE;
+struct zone_s ZoneTmpLow VAR32FLATVISIBLE, ZoneTmpHigh VAR32FLATVISIBLE;
-struct zone_s *Zones[] VAR32VISIBLE = {
+struct zone_s *Zones[] VAR32FLATVISIBLE = {
&ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh
};
+
+/****************************************************************
+ * 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
+ if (MODESEGMENT)
+ memcpy_far(FLATPTR_TO_SEG(newebda)
+ , (void*)FLATPTR_TO_OFFSET(newebda)
+ , FLATPTR_TO_SEG(oldebda)
+ , (void*)FLATPTR_TO_OFFSET(oldebda)
+ , ebda_size * 1024);
+ else
+ 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)
+{
+ u32 oldpos = GET_PMMVAR(ZoneLow.cur);
+ u32 newpos = ALIGN_DOWN(oldpos - size, align);
+ u32 bottom = GET_PMMVAR(ZoneLow.bottom);
+ if (newpos >= bottom && newpos <= oldpos)
+ // Space already present.
+ return;
+ u16 ebda_seg = get_ebda_seg();
+ u32 ebda_pos = (u32)MAKE_FLATPTR(ebda_seg, 0);
+ u8 ebda_size = GET_EBDA2(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.
+ oldpos = ebda_end;
+ newpos = ALIGN_DOWN(oldpos - 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;
+
+ // Move ebda
+ int ret = relocate_ebda(newebda, ebda_pos, ebda_size);
+ if (ret)
+ return;
+
+ // Update zone
+ SET_PMMVAR(ZoneLow.cur, oldpos);
+ SET_PMMVAR(ZoneLow.bottom, newbottom);
+}
+
+
+/****************************************************************
+ * zone allocations
+ ****************************************************************/
+
// Obtain memory from a given zone.
-void *
+static void *
zone_malloc(struct zone_s *zone, u32 size, u32 align)
{
u32 oldpos = GET_PMMVAR(zone->cur);
return (void*)newpos;
}
-// Return memory to a zone (if it was the last to be allocated).
-static void
-zone_free(struct zone_s *zone, void *data, u32 olddata)
-{
- if (! data || GET_PMMVAR(zone->cur) != (u32)data)
- return;
- SET_PMMVAR(zone->cur, olddata);
-}
-
// Find the zone that contains the given data block.
static struct zone_s *
zone_find(void *data)
return NULL;
}
+// Return memory to a zone (if it was the last to be allocated).
+static int
+zone_free(void *data, u32 olddata)
+{
+ struct zone_s *zone = zone_find(data);
+ if (!zone || !data || GET_PMMVAR(zone->cur) != (u32)data)
+ return -1;
+ SET_PMMVAR(zone->cur, olddata);
+ return 0;
+}
+
// Report the status of all the zones.
static void
dumpZones()
}
}
-void
-malloc_setup()
-{
- ASSERT32();
- dprintf(3, "malloc setup\n");
-
- // Memory in 0xf0000 area.
- memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE);
- ZoneFSeg.bottom = (u32)BiosTableSpace;
- ZoneFSeg.top = ZoneFSeg.cur = ZoneFSeg.bottom + CONFIG_MAX_BIOSTABLE;
-
- // Memory under 1Meg.
- ZoneTmpLow.bottom = BUILD_STACK_ADDR;
- ZoneTmpLow.top = ZoneTmpLow.cur = (u32)MAKE_FLATPTR(EBDA_SEGMENT_MINIMUM, 0);
-
- // Permanent memory under 1Meg. XXX - not implemented yet.
- ZoneLow.bottom = ZoneLow.top = ZoneLow.cur = 0xa0000;
-
- // Find memory at the top of ram.
- struct e820entry *e = find_high_area(CONFIG_MAX_HIGHTABLE+MALLOC_MIN_ALIGN);
- if (!e) {
- // No memory above 1Meg
- memset(&ZoneHigh, 0, sizeof(ZoneHigh));
- memset(&ZoneTmpHigh, 0, sizeof(ZoneTmpHigh));
- return;
- }
- u32 top = e->start + e->size, bottom = e->start;
-
- // Memory at top of ram.
- ZoneHigh.bottom = ALIGN(top - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
- ZoneHigh.top = ZoneHigh.cur = ZoneHigh.bottom + CONFIG_MAX_HIGHTABLE;
- add_e820(ZoneHigh.bottom, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
-
- // Memory above 1Meg
- ZoneTmpHigh.bottom = ALIGN(bottom, MALLOC_MIN_ALIGN);
- ZoneTmpHigh.top = ZoneTmpHigh.cur = ZoneHigh.bottom;
-}
-
-void
-malloc_finalize()
-{
- dprintf(3, "malloc finalize\n");
-
- dumpZones();
-
- // Give back unused high ram.
- u32 giveback = ALIGN_DOWN(ZoneHigh.cur - ZoneHigh.bottom, PAGE_SIZE);
- add_e820(ZoneHigh.bottom, giveback, E820_RAM);
- dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
-
- // Clear low-memory allocations.
- memset((void*)ZoneTmpLow.bottom, 0, ZoneTmpLow.top - ZoneTmpLow.bottom);
-}
-
/****************************************************************
- * pmm allocation
+ * tracked memory allocations
****************************************************************/
// Information on PMM tracked allocations
struct pmmalloc_s *next;
};
-struct pmmalloc_s *PMMAllocs VAR32VISIBLE;
-
-// Memory zone that pmm allocation tracking info is stored in
-#define ZONEALLOC (&ZoneTmpHigh)
+struct pmmalloc_s *PMMAllocs VAR32FLATVISIBLE;
// Allocate memory from the given zone and track it as a PMM allocation
-static void *
+void *
pmm_malloc(struct zone_s *zone, u32 handle, u32 size, u32 align)
{
- u32 oldallocdata = GET_PMMVAR(ZONEALLOC->cur);
- struct pmmalloc_s *info = zone_malloc(ZONEALLOC, sizeof(*info)
+ u32 oldallocdata = GET_PMMVAR(ZoneTmpHigh.cur);
+ struct pmmalloc_s *info = zone_malloc(&ZoneTmpHigh, sizeof(*info)
, MALLOC_MIN_ALIGN);
- if (!info)
- return NULL;
+ if (!info) {
+ oldallocdata = GET_PMMVAR(ZoneTmpLow.cur);
+ info = zone_malloc(&ZoneTmpLow, sizeof(*info), MALLOC_MIN_ALIGN);
+ if (!info)
+ return NULL;
+ }
+ if (zone == &ZoneLow)
+ zonelow_expand(size, align);
u32 olddata = GET_PMMVAR(zone->cur);
void *data = zone_malloc(zone, size, align);
if (! data) {
- zone_free(ZONEALLOC, info, oldallocdata);
+ zone_free(info, oldallocdata);
return NULL;
}
dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
// Free a raw data block (either from a zone or from pmm alloc list).
static void
-pmm_free_data(struct zone_s *zone, void *data, u32 olddata)
+pmm_free_data(void *data, u32 olddata)
{
- if (GET_PMMVAR(zone->cur) == (u32)data) {
- zone_free(zone, data, olddata);
+ int ret = zone_free(data, olddata);
+ if (!ret)
+ // Success - done.
return;
- }
struct pmmalloc_s *info;
for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
if (GET_PMMVAR(info->olddata) == (u32)data) {
}
// Free a data block allocated with pmm_malloc
-static int
+int
pmm_free(void *data)
{
- struct zone_s *zone = zone_find(GET_PMMVAR(data));
- if (!zone)
- return -1;
struct pmmalloc_s **pinfo = &PMMAllocs;
for (;;) {
struct pmmalloc_s *info = GET_PMMVAR(*pinfo);
SET_PMMVAR(*pinfo, GET_PMMVAR(info->next));
u32 oldallocdata = GET_PMMVAR(info->oldallocdata);
u32 olddata = GET_PMMVAR(info->olddata);
- pmm_free_data(zone, data, olddata);
- pmm_free_data(ZONEALLOC, info, oldallocdata);
- dprintf(8, "pmm_free data=%p zone=%p olddata=%p oldallocdata=%p"
- " info=%p\n"
- , data, zone, (void*)olddata, (void*)oldallocdata
- , info);
+ pmm_free_data(data, olddata);
+ pmm_free_data(info, oldallocdata);
+ dprintf(8, "pmm_free data=%p olddata=%p oldallocdata=%p info=%p\n"
+ , data, (void*)olddata, (void*)oldallocdata, info);
return 0;
}
pinfo = &info->next;
static u32
pmm_getspace(struct zone_s *zone)
{
+ // XXX - doesn't account for ZoneLow being able to grow.
u32 space = GET_PMMVAR(zone->cur) - GET_PMMVAR(zone->bottom);
- if (zone != ZONEALLOC)
+ if (zone != &ZoneTmpHigh && zone != &ZoneTmpLow)
return space;
+ // Account for space needed for PMM tracking.
u32 reserve = ALIGN(sizeof(struct pmmalloc_s), MALLOC_MIN_ALIGN);
if (space <= reserve)
return 0;
return NULL;
}
+void
+malloc_setup()
+{
+ ASSERT32FLAT();
+ dprintf(3, "malloc setup\n");
+
+ PMMAllocs = NULL;
+
+ // Memory in 0xf0000 area.
+ extern u8 code32flat_start[];
+ if ((u32)code32flat_start > BUILD_BIOS_ADDR)
+ // Clear unused parts of f-segment
+ memset((void*)BUILD_BIOS_ADDR, 0
+ , (u32)code32flat_start - BUILD_BIOS_ADDR);
+ memset(BiosTableSpace, 0, CONFIG_MAX_BIOSTABLE);
+ ZoneFSeg.bottom = (u32)BiosTableSpace;
+ ZoneFSeg.top = ZoneFSeg.cur = ZoneFSeg.bottom + CONFIG_MAX_BIOSTABLE;
+
+ // Memory under 1Meg.
+ ZoneTmpLow.bottom = BUILD_STACK_ADDR;
+ ZoneTmpLow.top = ZoneTmpLow.cur = BUILD_EBDA_MINIMUM;
+
+ // Permanent memory under 1Meg.
+ ZoneLow.bottom = ZoneLow.top = ZoneLow.cur = BUILD_LOWRAM_END;
+
+ // Find memory at the top of ram.
+ struct e820entry *e = find_high_area(CONFIG_MAX_HIGHTABLE+MALLOC_MIN_ALIGN);
+ if (!e) {
+ // No memory above 1Meg
+ memset(&ZoneHigh, 0, sizeof(ZoneHigh));
+ memset(&ZoneTmpHigh, 0, sizeof(ZoneTmpHigh));
+ return;
+ }
+ u32 top = e->start + e->size, bottom = e->start;
+
+ // Memory at top of ram.
+ ZoneHigh.bottom = ALIGN(top - CONFIG_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
+ ZoneHigh.top = ZoneHigh.cur = ZoneHigh.bottom + CONFIG_MAX_HIGHTABLE;
+ add_e820(ZoneHigh.bottom, CONFIG_MAX_HIGHTABLE, E820_RESERVED);
+
+ // Memory above 1Meg
+ ZoneTmpHigh.bottom = ALIGN(bottom, MALLOC_MIN_ALIGN);
+ ZoneTmpHigh.top = ZoneTmpHigh.cur = ZoneHigh.bottom;
+}
+
+void
+malloc_finalize()
+{
+ dprintf(3, "malloc finalize\n");
+
+ dumpZones();
+
+ // Reserve more low-mem if needed.
+ u32 endlow = GET_BDA(mem_size_kb)*1024;
+ add_e820(endlow, BUILD_LOWRAM_END-endlow, E820_RESERVED);
+
+ // Give back unused high ram.
+ u32 giveback = ALIGN_DOWN(ZoneHigh.cur - ZoneHigh.bottom, PAGE_SIZE);
+ add_e820(ZoneHigh.bottom, giveback, E820_RAM);
+ dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
+
+ // Clear low-memory allocations.
+ memset((void*)ZoneTmpLow.bottom, 0, ZoneTmpLow.top - ZoneTmpLow.bottom);
+}
+
/****************************************************************
* pmm interface
{
u32 handle = *(u32*)&args[1];
dprintf(3, "pmm01: handle=%x\n", handle);
- if (handle == 0xFFFFFFFF)
+ if (handle == PMM_DEFAULT_HANDLE)
return 0;
return (u32)pmm_find(handle);
}
dprintf(3, "init PMM\n");
- PMMAllocs = NULL;
-
PMMHEADER.signature = PMM_SIGNATURE;
PMMHEADER.entry_offset = (u32)entry_pmm - BUILD_BIOS_ADDR;
PMMHEADER.checksum -= checksum(&PMMHEADER, sizeof(PMMHEADER));
projects / seabios.git / blobdiff