#include "util.h" // checksum
#include "config.h" // BUILD_BIOS_ADDR
+#include "memmap.h" // find_high_area
+#include "farptr.h" // GET_FARVAR
+#include "biosvar.h" // EBDA_SEGMENT_MINIMUM
+
+
+/****************************************************************
+ * malloc
+ ****************************************************************/
+
+#if MODE16
+// 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))
+#else
+#define GET_PMMVAR(var) (var)
+#define SET_PMMVAR(var, val) do { (var) = (val); } while (0)
+#endif
+
+// Zone definitions
+struct zone_s {
+ 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 *Zones[] VAR32VISIBLE = {
+ &ZoneTmpLow, &ZoneLow, &ZoneFSeg, &ZoneTmpHigh, &ZoneHigh
+};
+
+// Obtain memory from a given zone.
+static void *
+zone_malloc(struct zone_s *zone, u32 size, u32 align)
+{
+ u32 newpos = (GET_PMMVAR(zone->cur) - size) / align * align;
+ if ((s32)(newpos - GET_PMMVAR(zone->bottom)) < 0)
+ // No space
+ return NULL;
+ SET_PMMVAR(zone->cur, newpos);
+ 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)
+{
+ int i;
+ for (i=0; i<ARRAY_SIZE(Zones); i++) {
+ struct zone_s *zone = GET_PMMVAR(Zones[i]);
+ if ((u32)data >= GET_PMMVAR(zone->cur)
+ && (u32)data < GET_PMMVAR(zone->top))
+ return zone;
+ }
+ return NULL;
+}
+
+// Report the status of all the zones.
+static void
+dumpZones()
+{
+ int i;
+ for (i=0; i<ARRAY_SIZE(Zones); i++) {
+ struct zone_s *zone = Zones[i];
+ u32 used = zone->top - zone->cur;
+ u32 avail = zone->top - zone->bottom;
+ u32 pct = avail ? ((100 * used) / avail) : 0;
+ dprintf(2, "zone %d: %08x-%08x used=%d (%d%%)\n"
+ , i, zone->bottom, zone->top, used, pct);
+ }
+}
+
+// Allocate memory at the top of 32bit ram.
+void *
+malloc_high(u32 size)
+{
+ return zone_malloc(&ZoneHigh, size, MALLOC_MIN_ALIGN);
+}
+
+// Allocate memory in the 0xf0000-0x100000 area of ram.
+void *
+malloc_fseg(u32 size)
+{
+ return zone_malloc(&ZoneFSeg, size, MALLOC_MIN_ALIGN);
+}
+
+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 = (ZoneHigh.cur - ZoneHigh.bottom) / 4096 * 4096;
+ 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
+ ****************************************************************/
+
+// Information on PMM tracked allocations
+struct pmmalloc_s {
+ void *data;
+ u32 olddata;
+ u32 handle;
+ u32 oldallocdata;
+ struct pmmalloc_s *next;
+};
+
+struct pmmalloc_s *PMMAllocs VAR32VISIBLE;
+
+// Memory zone that pmm allocation tracking info is stored in
+#define ZONEALLOC (&ZoneTmpHigh)
+
+// Allocate memory from the given zone and track it as a PMM allocation
+static 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)
+ , MALLOC_MIN_ALIGN);
+ if (!info)
+ return NULL;
+ u32 olddata = GET_PMMVAR(zone->cur);
+ void *data = zone_malloc(zone, size, align);
+ if (! data) {
+ zone_free(ZONEALLOC, info, oldallocdata);
+ return NULL;
+ }
+ dprintf(8, "pmm_malloc zone=%p handle=%x size=%d align=%x"
+ " ret=%p (info=%p)\n"
+ , zone, handle, size, align
+ , data, info);
+ SET_PMMVAR(info->data, data);
+ SET_PMMVAR(info->olddata, olddata);
+ SET_PMMVAR(info->handle, handle);
+ SET_PMMVAR(info->oldallocdata, oldallocdata);
+ SET_PMMVAR(info->next, GET_PMMVAR(PMMAllocs));
+ SET_PMMVAR(PMMAllocs, info);
+ return data;
+}
+
+// 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)
+{
+ if (GET_PMMVAR(zone->cur) == (u32)data) {
+ zone_free(zone, data, olddata);
+ return;
+ }
+ struct pmmalloc_s *info;
+ for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
+ if (GET_PMMVAR(info->olddata) == (u32)data) {
+ SET_PMMVAR(info->olddata, olddata);
+ return;
+ } else if (GET_PMMVAR(info->oldallocdata) == (u32)data) {
+ SET_PMMVAR(info->oldallocdata, olddata);
+ return;
+ }
+}
+
+// Free a data block allocated with pmm_malloc
+static 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);
+ if (!info)
+ return -1;
+ if (GET_PMMVAR(info->data) == data) {
+ 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);
+ return 0;
+ }
+ pinfo = &info->next;
+ }
+}
+
+// Find the amount of free space in a given zone.
+static u32
+pmm_getspace(struct zone_s *zone)
+{
+ u32 space = GET_PMMVAR(zone->cur) - GET_PMMVAR(zone->bottom);
+ if (zone != ZONEALLOC)
+ return space;
+ u32 reserve = ALIGN(sizeof(struct pmmalloc_s), MALLOC_MIN_ALIGN);
+ if (space <= reserve)
+ return 0;
+ return space - reserve;
+}
+
+// Find the data block allocated with pmm_malloc with a given handle.
+static void *
+pmm_find(u32 handle)
+{
+ struct pmmalloc_s *info;
+ for (info=GET_PMMVAR(PMMAllocs); info; info = GET_PMMVAR(info->next))
+ if (GET_PMMVAR(info->handle) == handle)
+ return GET_PMMVAR(info->data);
+ return NULL;
+}
+
+
+/****************************************************************
+ * pmm interface
+ ****************************************************************/
struct pmmheader {
u32 signature;
};
#endif
-#define FUNCTION_NOT_SUPPORTED 0xffffffff
+#define PMM_FUNCTION_NOT_SUPPORTED 0xffffffff
// PMM - allocate
static u32
{
u32 length = *(u32*)&args[1], handle = *(u32*)&args[3];
u16 flags = args[5];
- dprintf(1, "pmm00: length=%x handle=%x flags=%x\n"
+ dprintf(3, "pmm00: length=%x handle=%x flags=%x\n"
, length, handle, flags);
- // XXX
- return 0;
+ 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
handle_pmm01(u16 *args)
{
u32 handle = *(u32*)&args[1];
- dprintf(1, "pmm01: handle=%x\n", handle);
- // XXX
- return 0;
+ dprintf(3, "pmm01: handle=%x\n", handle);
+ if (handle == 0xFFFFFFFF)
+ return 0;
+ return (u32)pmm_find(handle);
}
// PMM - deallocate
handle_pmm02(u16 *args)
{
u32 buffer = *(u32*)&args[1];
- dprintf(1, "pmm02: buffer=%x\n", buffer);
- // XXX
+ 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 FUNCTION_NOT_SUPPORTED;
+ return PMM_FUNCTION_NOT_SUPPORTED;
}
u32 VISIBLE16
handle_pmm(u16 *args)
{
if (! CONFIG_PMM)
- return FUNCTION_NOT_SUPPORTED;
+ return PMM_FUNCTION_NOT_SUPPORTED;
u16 arg1 = args[0];
dprintf(DEBUG_HDL_pmm, "pmm call arg1=%x\n", arg1);
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));
PMMHEADER.signature = 0;
PMMHEADER.entry_offset = 0;
-
- // XXX - zero low-memory allocations.
}
projects / seabios.git / blobdiff