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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2003-2004 Eric Biederman
* Copyright (C) 2005-2010 coresystems GmbH
* Copyright (C) 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <console/console.h>
#include <bootmem.h>
#include <cbmem.h>
#include <device/resource.h>
#include <stdlib.h>
static struct memranges bootmem;
void bootmem_init(void)
{
const unsigned long cacheable = IORESOURCE_CACHEABLE;
const unsigned long reserved = IORESOURCE_RESERVE;
struct memranges *bm = &bootmem;
/*
* Fill the memory map out. The order of operations is important in
* that each overlapping range will take over the next. Therefore,
* add cacheable resources as RAM then add the reserved resources.
*/
memranges_init(bm, cacheable, cacheable, LB_MEM_RAM);
memranges_add_resources(bm, reserved, reserved, LB_MEM_RESERVED);
/* Add memory used by CBMEM. */
cbmem_add_bootmem();
}
void bootmem_add_range(uint64_t start, uint64_t size, uint32_t type)
{
memranges_insert(&bootmem, start, size, type);
}
void bootmem_write_memory_table(struct lb_memory *mem)
{
const struct range_entry *r;
struct lb_memory_range *lb_r;
lb_r = &mem->map[0];
bootmem_dump_ranges();
memranges_each_entry(r, &bootmem) {
lb_r->start = pack_lb64(range_entry_base(r));
lb_r->size = pack_lb64(range_entry_size(r));
lb_r->type = range_entry_tag(r);
lb_r++;
mem->size += sizeof(struct lb_memory_range);
}
}
struct range_strings {
unsigned long tag;
const char *str;
};
static const struct range_strings type_strings[] = {
{ LB_MEM_RAM, "RAM" },
{ LB_MEM_RESERVED, "RESERVED" },
{ LB_MEM_ACPI, "ACPI" },
{ LB_MEM_NVS, "NVS" },
{ LB_MEM_UNUSABLE, "UNUSABLE" },
{ LB_MEM_VENDOR_RSVD, "VENDOR RESERVED" },
{ LB_MEM_TABLE, "CONFIGURATION TABLES" },
};
static const char *bootmem_range_string(unsigned long tag)
{
int i;
for (i = 0; i < ARRAY_SIZE(type_strings); i++) {
if (type_strings[i].tag == tag)
return type_strings[i].str;
}
return "UNKNOWN!";
}
void bootmem_dump_ranges(void)
{
int i;
const struct range_entry *r;
i = 0;
memranges_each_entry(r, &bootmem) {
printk(BIOS_DEBUG, "%2d. %016llx-%016llx: %s\n",
i, range_entry_base(r), range_entry_end(r) - 1,
bootmem_range_string(range_entry_tag(r)));
i++;
}
}
int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size)
{
const struct range_entry *r;
uint64_t end = start + size;
memranges_each_entry(r, &bootmem) {
/* All further bootmem entries are beyond this range. */
if (end <= range_entry_base(r))
break;
if (start >= range_entry_base(r) && end <= range_entry_end(r)) {
if (range_entry_tag(r) == LB_MEM_RAM)
return 1;
}
}
return 0;
}
void *bootmem_allocate_buffer(size_t size)
{
const struct range_entry *r;
const struct range_entry *region;
/* All allocated buffers fall below the 32-bit boundary. */
const resource_t max_addr = 1ULL << 32;
resource_t begin;
resource_t end;
/* 4KiB alignment. */
size = ALIGN(size, 4096);
region = NULL;
memranges_each_entry(r, &bootmem) {
if (range_entry_size(r) < size)
continue;
if (range_entry_tag(r) != LB_MEM_RAM)
continue;
if (range_entry_base(r) >= max_addr)
continue;
end = range_entry_end(r);
if (end > max_addr)
end = max_addr;
if ((end - range_entry_base(r)) < size)
continue;
region = r;
}
if (region == NULL)
return NULL;
/* region now points to the highest usable region for the given size. */
begin = range_entry_base(region);
end = range_entry_end(region);
if (end > max_addr)
end = max_addr;
begin = end - size;
/* Mark buffer as unusuable for future buffer use. */
bootmem_add_range(begin, size, LB_MEM_UNUSABLE);
return (void *)(uintptr_t)begin;
}
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