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/*
* Commonly used ACPI utility functions.
* Probing for devices and writing SSDT entries into XSDT and RSDT tables.
*
* Yu Ke, ke.yu@intel.com
* Copyright (c) 2005, Intel Corporation.
* Copyright (c) 2006, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*/
#include "acpi/acpi2_0.h"
#include "acpi_utils.h"
#include "util.h"
#include <xen/hvm/e820.h>
static int acpi_rsdt_add_entry_pointer(unsigned char *acpi_start,
unsigned char *entry);
static int acpi_xsdt_add_entry_pointer(unsigned char *acpi_start,
unsigned char *entry);
static unsigned char *acpi_xsdt_add_entry(unsigned char *acpi_start,
unsigned char **freemem,
unsigned char *limit,
unsigned char *table,
unsigned int table_size);
void set_checksum(void *start, int checksum_offset, int len)
{
unsigned char sum = 0;
unsigned char *ptr;
ptr = start;
ptr[checksum_offset] = 0;
while ( len-- )
sum += *ptr++;
ptr = start;
ptr[checksum_offset] = -sum;
}
#include "acpi_ssdt_tpm.h"
static void acpi_tpm_tis_probe(unsigned char *acpi_start,
unsigned char **freemem,
unsigned char *limit)
{
unsigned char *addr;
ACPI_2_0_TCPA_CLIENT *tcpa;
/* check TPM_DID, TPM_VID, TPM_RID in ioemu/hw/tpm_tis.c */
uint16_t tis_did_vid_rid[] = {0x0001, 0x0001, 0x0001};
static const ACPI_2_0_TCPA_CLIENT Tcpa = {
.header = {
.signature = ACPI_2_0_TCPA_SIGNATURE,
.length = sizeof(ACPI_2_0_TCPA_CLIENT),
.revision = ACPI_2_0_TCPA_REVISION,
.oem_id = {'I', 'B', 'M', ' ', ' ', ' '},
.oem_table_id = ASCII64(' ', ' ', ' ', ' ', ' ', 'x', 'e', 'n'),
.oem_revision = 1,
.creator_id = ASCII32('I', 'B', 'M', ' '),
.creator_revision = 1,
}
};
/* probe for TIS interface ... */
if ( memcmp((char *)(0xFED40000 + 0xF00),
tis_did_vid_rid,
sizeof(tis_did_vid_rid)) != 0 )
return;
printf("TIS is available\n");
addr = acpi_xsdt_add_entry(acpi_start, freemem, limit,
AmlCode_TPM, sizeof(AmlCode_TPM));
if ( addr == NULL )
return;
/* legacy systems need an RSDT entry */
if ( acpi_rsdt_add_entry_pointer(acpi_start, addr) != 1 )
return;
/* add ACPI TCPA table */
addr = acpi_xsdt_add_entry(acpi_start, freemem, limit,
(unsigned char *)&Tcpa,
sizeof(Tcpa));
if ( addr == NULL )
return;
tcpa = (ACPI_2_0_TCPA_CLIENT *)addr;
tcpa->LASA = e820_malloc(
ACPI_2_0_TCPA_LAML_SIZE, E820_RESERVED, (uint32_t)~0);
if ( tcpa->LASA )
{
tcpa->LAML = ACPI_2_0_TCPA_LAML_SIZE;
memset((char *)(unsigned long)tcpa->LASA,
0x0,
tcpa->LAML);
set_checksum(tcpa,
FIELD_OFFSET(struct acpi_header, checksum),
tcpa->header.length);
}
if ( acpi_rsdt_add_entry_pointer(acpi_start, addr) != 1 )
return;
}
/*
* Call functions that probe for devices and have them register their
* SSDT entries with the XSDT and RSDT tables.
*/
void acpi_update(unsigned char *acpi_start,
unsigned long acpi_size,
unsigned char *limit,
unsigned char **freemem)
{
acpi_tpm_tis_probe(acpi_start, freemem, limit);
}
/*
* Search for the RSDP in memory below the BIOS
*/
struct acpi_20_rsdp *acpi_rsdp_get(unsigned char *acpi_start)
{
int offset = 0;
int found = 0;
static int displayed = 0;
struct acpi_20_rsdp *rsdp;
while ( &acpi_start[offset] < (unsigned char *)0xf0000 )
{
rsdp = (struct acpi_20_rsdp *)&acpi_start[offset];
if ( rsdp->signature == ACPI_2_0_RSDP_SIGNATURE )
{
found = 1;
break;
}
offset += 0x10;
}
if ( !found )
rsdp = NULL;
if ( !displayed )
{
if ( rsdp )
printf("Found RSDP at %lx\n",(long)rsdp);
else
printf("ERROR: RSDP was not found\n");
displayed = 1;
}
return rsdp;
}
struct acpi_20_rsdt *acpi_rsdt_get(unsigned char *acpi_start)
{
struct acpi_20_rsdp *rsdp;
struct acpi_20_rsdt *rsdt;
rsdp = acpi_rsdp_get(acpi_start);
if (!rsdp)
return NULL;
rsdt = (struct acpi_20_rsdt *)
(acpi_start + rsdp->rsdt_address - ACPI_PHYSICAL_ADDRESS);
if ( rsdt->header.signature != ACPI_2_0_RSDT_SIGNATURE )
{
printf("Bad RSDT signature\n");
return NULL;
}
return rsdt;
}
/*
* Add an entry to the RSDT table given the pointer to the entry.
*/
static int acpi_rsdt_add_entry_pointer(unsigned char *acpi_start,
unsigned char *entry)
{
struct acpi_20_rsdt *rsdt = acpi_rsdt_get(acpi_start);
int found = 0;
int i = 0;
/* Find an empty slot in the RSDT table. */
while ( i < ACPI_MAX_NUM_TABLES )
{
if ( rsdt->entry[i] == 0 )
{
found = 1;
break;
}
i++;
}
if ( found )
{
rsdt->entry[i] = (uint64_t)(unsigned long)entry;
rsdt->header.length =
sizeof(struct acpi_header) +
(i + 1) * sizeof(uint64_t);
set_checksum(rsdt,
FIELD_OFFSET(struct acpi_header, checksum),
rsdt->header.length);
}
return found;
}
/* Get the XSDT table. */
struct acpi_20_xsdt *acpi_xsdt_get(unsigned char *acpi_start)
{
struct acpi_20_rsdp *rsdp;
struct acpi_20_xsdt *xsdt;
rsdp = acpi_rsdp_get(acpi_start);
if (!rsdp)
return NULL;
xsdt = (struct acpi_20_xsdt *)
(acpi_start + rsdp->xsdt_address - ACPI_PHYSICAL_ADDRESS);
if ( xsdt->header.signature != ACPI_2_0_XSDT_SIGNATURE )
{
printf("Bad XSDT signature\n");
return NULL;
}
return xsdt;
}
/*
* Add an entry to the XSDT table given the pointer to the entry.
*/
static int acpi_xsdt_add_entry_pointer(unsigned char *acpi_start,
unsigned char *entry)
{
struct acpi_20_xsdt *xsdt = acpi_xsdt_get(acpi_start);
int found = 0;
int i = 0;
/* Find an empty slot in the XSDT table. */
while ( i < ACPI_MAX_NUM_TABLES )
{
if ( xsdt->entry[i] == 0 )
{
found = 1;
break;
}
i++;
}
if ( found )
{
xsdt->entry[i] = (uint64_t)(unsigned long)entry;
xsdt->header.length =
sizeof(struct acpi_header) +
(i + 1) * sizeof(uint64_t);
set_checksum(xsdt,
FIELD_OFFSET(struct acpi_header, checksum),
xsdt->header.length);
}
return found;
}
/*
add an entry to the xdst table entry pointers
copy the given ssdt data to the current available memory at
freemem, if it does not exceed the limit
*/
static unsigned char *acpi_xsdt_add_entry(unsigned char *acpi_start,
unsigned char **freemem,
unsigned char *limit,
unsigned char *table,
unsigned int table_size)
{
struct acpi_20_xsdt *xsdt = acpi_xsdt_get(acpi_start);
int found = 0, i = 0;
unsigned char *addr = NULL;
/* Check for an empty slot in the Xsdt table. */
while ( i < ACPI_MAX_NUM_TABLES )
{
if ( xsdt->entry[i] == 0 )
{
found = 1;
break;
}
i++;
}
if ( found )
{
/* memory below hard limit ? */
if ( (*freemem + table_size) <= limit )
{
addr = *freemem;
memcpy(addr, table, table_size);
printf("Copied dyn. ACPI entry to %lx\n",(long)addr);
*freemem += ((table_size + 0xf) & ~0xf);
acpi_xsdt_add_entry_pointer(acpi_start, addr);
}
}
return addr;
}
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