// 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
+
+/****************************************************************
+ * e820 memory map
+ ****************************************************************/
+
// Remove an entry from the e820_list.
static void
remove_e820(int i)
insert_e820(int i, u64 start, u64 size, u32 type)
{
if (e820_count >= CONFIG_MAX_E820) {
- dprintf(1, "Overflowed e820 list!\n");
+ warn_noalloc();
return;
}
// 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\n", i
, (u32)(e->start >> 32), (u32)e->start
, (u32)(e_end >> 32), (u32)e_end
, 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.
continue;
- // New item overlaps (or borders) 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);
if (type == e->type) {
// Same type - merge them.
size += start - e->start;
start = e->start;
- i--;
- remove_e820(i);
+ } else {
+ // Split existing item.
+ e->size = start - e->start;
+ i++;
+ if (e_end > end)
+ insert_e820(i, end, e_end - end, e->type);
}
}
- if (type != E820_HOLE) {
- 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)
- // No overlap - done.
- break;
- e_end = e->start + e->size;
- if (end >= e_end) {
- // Existing item completely overlapped - remove it.
- remove_e820(i);
- continue;
- }
- // Not completely overlapped - adjust its start.
- e->start = end;
- e->size = e_end - e->start;
- if (type == e->type) {
- // Same type - merge them.
- (e-1)->size += e->size;
- remove_e820(i);
- }
+ 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();
}
-// Symbols defined in romlayout.S
-extern char freespace2_start, freespace2_end;
-
-u32 bios_table_cur_addr, bios_table_end_addr;
+// Find highest area of 32bit memory that can hold the given size.
+struct e820entry *
+find_high_area(u32 size)
+{
+ int i;
+ for (i=e820_count-1; i>=0; i--) {
+ struct e820entry *e = &e820_list[i];
+ u64 end = e->start + e->size;
+ if (e->type != E820_RAM || end > 0xffffffff || e->size < size)
+ continue;
+ if (end < 1024*1024 + size)
+ break;
+ return e;
+ }
+ return NULL;
+}
// Prep for memmap stuff - init bios table locations.
void
-memmap_setup()
+memmap_setup(void)
{
- bios_table_cur_addr = (u32)&freespace2_start;
- bios_table_end_addr = (u32)&freespace2_end;
- dprintf(1, "bios_table_addr: 0x%08x end=0x%08x\n",
- bios_table_cur_addr, bios_table_end_addr);
-
- bios_table_cur_addr = ALIGN(bios_table_cur_addr, 4);
- u32 msize = CONFIG_MAX_E820 * sizeof(e820_list[0]);
- if (bios_table_cur_addr + msize > bios_table_end_addr) {
- dprintf(1, "No room for e820 map!\n");
- return;
- }
- e820_list = (void*)bios_table_cur_addr;
- bios_table_cur_addr += msize;
+ e820_count = 0;
}
-// Copy the temporary e820 map info to its permanent location.
+// Report on final memory locations.
void
-memmap_finalize()
+memmap_finalize(void)
{
dump_map();
-
- dprintf(1, "final bios_table_addr: 0x%08x (used %d%%)\n"
- , bios_table_cur_addr
- , (100 * (bios_table_cur_addr - (u32)&freespace2_start)
- / ((u32)&freespace2_end - (u32)&freespace2_start)));
- if (bios_table_cur_addr > bios_table_end_addr)
- BX_PANIC("bios_table_end_addr overflow!\n");
}
projects / seabios.git / blobdiff