// Support for building memory maps suitable for int 15 e820 calls.
//
-// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
//
-// This file may be distributed under the terms of the GNU GPLv3 license.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "memmap.h" // struct e820entry
#include "util.h" // dprintf.h
+#include "biosvar.h" // SET_EBDA
-// Temporary storage used during map building.
-static struct e820entry e820_list[64];
-static int e820_count;
+
+/****************************************************************
+ * e820 memory map
+ ****************************************************************/
// Remove an entry from the e820_list.
static void
static void
insert_e820(int i, u64 start, u64 size, u32 type)
{
- if (e820_count >= ARRAY_SIZE(e820_list)) {
- dprintf(1, "Overflowed e820 list!\n");
+ if (e820_count >= CONFIG_MAX_E820) {
+ warn_noalloc();
return;
}
e->type = type;
}
+static const char *
+e820_type_name(u32 type)
+{
+ switch (type) {
+ case E820_RAM: return "RAM";
+ case E820_RESERVED: return "RESERVED";
+ case E820_ACPI: return "ACPI";
+ case E820_NVS: return "NVS";
+ case E820_UNUSABLE: return "UNUSABLE";
+ case E820_HOLE: return "HOLE";
+ default: return "UNKNOWN";
+ }
+}
+
// Show the current e820_list.
static void
-dump_map()
+dump_map(void)
{
dprintf(1, "e820 map has %d items:\n", e820_count);
int i;
for (i=0; i<e820_count; i++) {
struct e820entry *e = &e820_list[i];
u64 e_end = e->start + e->size;
- dprintf(1, " %d: %x%x - %x%x = %d\n", i
+ dprintf(1, " %d: %08x%08x - %08x%08x = %d %s\n", i
, (u32)(e->start >> 32), (u32)e->start
, (u32)(e_end >> 32), (u32)e_end
- , e->type);
+ , e->type, e820_type_name(e->type));
}
}
void
add_e820(u64 start, u64 size, u32 type)
{
- dprintf(8, "Add to e820 map: %x %x %d\n", (u32)start, (u32)size, type);
+ dprintf(8, "Add to e820 map: %08x %08x %d\n", (u32)start, (u32)size, type);
if (! size)
// Huh? Nothing to do.
return;
+ // Find position of new item (splitting existing item if needed).
u64 end = start + size;
int i;
for (i=0; i<e820_count; i++) {
struct e820entry *e = &e820_list[i];
- if (end <= e->start)
- // Simple insertion point.
- break;
u64 e_end = e->start + e->size;
- if (start >= e_end)
- // No overlap.
+ if (start > e_end)
continue;
- // New item overlaps with an existing one.
+ // Found position - check if an existing item needs to be split.
if (start > e->start) {
- e->size = start - e->start;
- i++;
- if (end < e_end)
- // Need to split existing item
- insert_e820(i, end, e_end - end, e->type);
- }
- insert_e820(i, start, size, type);
- i++;
- // Remove all existing items that are completely overlapped.
- while (i<e820_count) {
- e = &e820_list[i];
- if (end <= e->start)
- break;
- e_end = e->start + e->size;
- if (end < e_end) {
- // Existing item not completely overlapped - adjust its start.
- e->start = end;
- e->size = e_end - e->start;
- break;
+ if (type == e->type) {
+ // Same type - merge them.
+ size += start - e->start;
+ start = e->start;
+ } else {
+ // Split existing item.
+ e->size = start - e->start;
+ i++;
+ if (e_end > end)
+ insert_e820(i, end, e_end - end, e->type);
}
+ }
+ break;
+ }
+ // Remove/adjust existing items that are overlapping.
+ while (i<e820_count) {
+ struct e820entry *e = &e820_list[i];
+ if (end < e->start)
+ // No overlap - done.
+ break;
+ u64 e_end = e->start + e->size;
+ if (end >= e_end) {
+ // Existing item completely overlapped - remove it.
remove_e820(i);
+ continue;
}
- //dump_map();
- return;
+ // Not completely overlapped - adjust its start.
+ e->start = end;
+ e->size = e_end - end;
+ if (type == e->type) {
+ // Same type - merge them.
+ size += e->size;
+ remove_e820(i);
+ }
+ break;
}
- // Just insert item.
- insert_e820(i, start, size, type);
+ // Insert new item.
+ if (type != E820_HOLE)
+ insert_e820(i, start, size, type);
//dump_map();
}
-u32 bios_table_cur_addr, bios_table_end_addr;
-
-// Prep for memmap stuff - init bios table locations.
-void
-memmap_setup()
-{
- bios_table_cur_addr = 0xf0000 | OFFSET_freespace2_start;
- bios_table_end_addr = 0xf0000 | OFFSET_freespace2_end;
- dprintf(1, "bios_table_addr: 0x%08x end=0x%08x\n",
- bios_table_cur_addr, bios_table_end_addr);
-}
-
-// Copy the temporary e820 map info to its permanent location.
+// Report on final memory locations.
void
-memmap_finalize()
+memmap_finalize(void)
{
dump_map();
-
- u32 msize = e820_count * sizeof(e820_list[0]);
- if (bios_table_cur_addr + msize > bios_table_end_addr) {
- dprintf(1, "No room for e820 map!\n");
- return;
- }
- memcpy((void*)bios_table_cur_addr, e820_list, msize);
- SET_EBDA(e820_loc, bios_table_cur_addr);
- SET_EBDA(e820_count, e820_count);
- bios_table_cur_addr += msize;
}
projects / seabios.git / blobdiff