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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 coresystems GmbH
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <types.h>
#include <string.h>
#include <cbmem.h>
#include <console/console.h>
#if 1
#define debug(x...) printk_debug(x)
#else
#define debug(x...)
#endif
// The CBMEM TOC reserves 512 bytes to keep
// the other entries somewhat aligned.
// Increase if MAX_CBMEM_ENTRIES exceeds 21
#define CBMEM_TOC_RESERVED 512
#define MAX_CBMEM_ENTRIES 16
#define CBMEM_MAGIC 0x434f5245
struct cbmem_entry {
u32 magic;
u32 id;
u64 base;
u64 size;
} __attribute__((packed));
#ifndef __PRE_RAM__
struct cbmem_entry *bss_cbmem_toc;
#endif
/**
* cbmem is a simple mechanism to do some kind of book keeping of the coreboot
* high tables memory. This is a small amount of memory which is "stolen" from
* the system memory for coreboot purposes. Usually this memory is used for
* - the coreboot table
* - legacy tables (PIRQ, MP table)
* - ACPI tables
* - suspend/resume backup memory
*/
void cbmem_init(u64 baseaddr, u64 size)
{
struct cbmem_entry *cbmem_toc;
cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
#ifndef __PRE_RAM__
bss_cbmem_toc = cbmem_toc;
#endif
debug("Initializing CBMEM area to 0x%llx (%lld bytes)\n", baseaddr, size);
if (size < (64 * 1024)) {
debug("Increase CBMEM size!!\n");
for (;;) ;
}
memset(cbmem_toc, 0, CBMEM_TOC_RESERVED);
cbmem_toc[0] = (struct cbmem_entry) {
.magic = CBMEM_MAGIC,
.id = CBMEM_ID_FREESPACE,
.base = baseaddr + CBMEM_TOC_RESERVED,
.size = size - CBMEM_TOC_RESERVED
};
}
int cbmem_reinit(u64 baseaddr)
{
struct cbmem_entry *cbmem_toc;
cbmem_toc = (struct cbmem_entry *)(unsigned long)baseaddr;
debug("Re-Initializing CBMEM area to 0x%lx\n", (unsigned long)baseaddr);
#ifndef __PRE_RAM__
bss_cbmem_toc = cbmem_toc;
#endif
return (cbmem_toc[0].magic == CBMEM_MAGIC);
}
void *cbmem_add(u32 id, u64 size)
{
struct cbmem_entry *cbmem_toc;
int i;
#ifdef __PRE_RAM__
cbmem_toc = (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE);
#else
cbmem_toc = bss_cbmem_toc;
#endif
if (cbmem_toc == NULL) {
return NULL;
}
if (cbmem_toc[0].magic != CBMEM_MAGIC) {
printk_err("ERROR: CBMEM was not initialized yet.\n");
return NULL;
}
/* Will the entry fit at all? */
if (size > cbmem_toc[0].size) {
printk_err("ERROR: Not enough memory for table %x\n", id);
return NULL;
}
/* Align size to 512 byte blocks */
size = ALIGN(size, 512) < cbmem_toc[0].size ?
ALIGN(size, 512) : cbmem_toc[0].size;
/* Now look for the first free/usable TOC entry */
for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
if (cbmem_toc[i].id == CBMEM_ID_NONE)
break;
}
if (i >= MAX_CBMEM_ENTRIES) {
printk_err("ERROR: No more CBMEM entries available.\n");
return NULL;
}
debug("Adding CBMEM entry as no. %d\n", i);
cbmem_toc[i] = (struct cbmem_entry) {
.magic = CBMEM_MAGIC,
.id = id,
.base = cbmem_toc[0].base,
.size = size
};
cbmem_toc[0].base += size;
cbmem_toc[0].size -= size;
return (void *)(u32)cbmem_toc[i].base;
}
void *cbmem_find(u32 id)
{
struct cbmem_entry *cbmem_toc;
int i;
#ifdef __PRE_RAM__
cbmem_toc = (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE);
#else
cbmem_toc = bss_cbmem_toc;
#endif
if (cbmem_toc == NULL)
return NULL;
for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
if (cbmem_toc[i].id == id)
return (void *)(unsigned long)cbmem_toc[i].base;
}
return (void *)NULL;
}
#ifndef __PRE_RAM__
#if CONFIG_HAVE_ACPI_RESUME
extern u8 acpi_slp_type;
#endif
extern uint64_t high_tables_base, high_tables_size;
void cbmem_initialize(void)
{
#if CONFIG_HAVE_ACPI_RESUME
if (acpi_slp_type == 3) {
if (!cbmem_reinit(high_tables_base)) {
/* Something went wrong, our high memory area got wiped */
acpi_slp_type == 0;
cbmem_init(high_tables_base, high_tables_size);
}
} else {
cbmem_init(high_tables_base, high_tables_size);
}
#else
cbmem_init(high_tables_base, high_tables_size);
#endif
cbmem_arch_init();
}
#ifndef __PRE_RAM__
void cbmem_list(void)
{
struct cbmem_entry *cbmem_toc;
int i;
#ifdef __PRE_RAM__
cbmem_toc = (struct cbmem_entry *)(get_top_of_ram() - HIGH_MEMORY_SIZE);
#else
cbmem_toc = bss_cbmem_toc;
#endif
if (cbmem_toc == NULL)
return;
for (i = 0; i < MAX_CBMEM_ENTRIES; i++) {
if (cbmem_toc[i].magic != CBMEM_MAGIC)
continue;
printk_debug("%2d. ", i);
switch (cbmem_toc[i].id) {
case CBMEM_ID_FREESPACE: printk_debug("FREE SPACE "); break;
case CBMEM_ID_GDT: printk_debug("GDT "); break;
case CBMEM_ID_ACPI: printk_debug("ACPI "); break;
case CBMEM_ID_CBTABLE: printk_debug("COREBOOT "); break;
case CBMEM_ID_PIRQ: printk_debug("IRQ TABLE "); break;
case CBMEM_ID_MPTABLE: printk_debug("SMP TABLE "); break;
case CBMEM_ID_RESUME: printk_debug("ACPI RESUME"); break;
default: printk_debug("%08x ", cbmem_toc[i].id);
}
printk_debug("%08llx ", cbmem_toc[i].base);
printk_debug("%08llx\n", cbmem_toc[i].size);
}
}
#endif
#endif
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