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/* Copyright 2013-2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef pr_fmt
#define pr_fmt(fmt) "STB: " fmt
#endif
#include <skiboot.h>
#include <string.h>
#include <chip.h>
#include <xscom.h>
#include <inttypes.h>
#include "secureboot.h"
#include "cvc.h"
struct container_verification_code {
uint64_t start_addr;
uint64_t end_addr;
struct list_head service_list;
};
static struct container_verification_code *cvc = NULL;
static void *secure_rom_mem = NULL;
struct cvc_service {
int id;
uint64_t addr; /* base_addr + offset */
uint32_t version;
struct list_node link;
};
static struct {
enum cvc_service_id id;
const char *name;
} cvc_service_map[] = {
{ CVC_SHA512_SERVICE, "sha512" },
{ CVC_VERIFY_SERVICE, "verify" },
};
static struct cvc_service *cvc_find_service(enum cvc_service_id id)
{
struct cvc_service *service;
if (!cvc)
return NULL;
list_for_each(&cvc->service_list, service, link) {
if (service->id == id)
return service;
}
return NULL;
}
static const char *cvc_service_map_name(enum cvc_service_id id)
{
int i;
for (i = 0; i < ARRAY_SIZE(cvc_service_map); i++) {
if (cvc_service_map[i].id == id)
return cvc_service_map[i].name;
}
return NULL;
}
static void cvc_register(uint64_t start_addr, uint64_t end_addr)
{
if (cvc)
return;
cvc = malloc(sizeof(struct container_verification_code));
assert(cvc);
cvc->start_addr = start_addr;
cvc->end_addr = end_addr;
list_head_init(&cvc->service_list);
prlog(PR_INFO, "Found CVC @ %" PRIx64 "-%" PRIx64 "\n",
start_addr, end_addr);
}
static void cvc_service_register(uint32_t id, uint32_t offset, uint32_t version)
{
struct cvc_service *service;
const char *name;
if (!cvc)
return;
/* Service already registered? */
if (cvc_find_service(id))
return;
if (cvc->start_addr + offset > cvc->end_addr) {
prlog(PR_WARNING, "CVC service @ %x out of range, "
"id=%d\n", offset, id);
return;
}
name = cvc_service_map_name(id);
if (!name) {
prlog(PR_ERR, "CVC service %d not supported\n", id);
return;
}
service = malloc(sizeof(struct cvc_service));
assert(service);
service->id = id;
service->version = version;
service->addr = cvc->start_addr + offset;
list_add_tail(&cvc->service_list, &service->link);
prlog(PR_INFO, "Found CVC-%s @ %" PRIx64 ", version=%d\n",
name, service->addr, service->version);
}
#define SECURE_ROM_MEMORY_SIZE (16 * 1024)
#define SECURE_ROM_XSCOM_ADDRESS 0x02020017
#define SECURE_ROM_SHA512_OFFSET 0x20
#define SECURE_ROM_VERIFY_OFFSET 0x30
static int cvc_secure_rom_init(void) {
const uint32_t reg_addr = SECURE_ROM_XSCOM_ADDRESS;
uint64_t reg_data;
struct proc_chip *chip;
if (!secure_rom_mem) {
secure_rom_mem = malloc(SECURE_ROM_MEMORY_SIZE);
assert(secure_rom_mem);
}
/*
* The logic that contains the ROM within the processor is implemented
* in a way that it only responds to CI (cache inhibited) operations.
* Due to performance issues we copy the verification code from the
* secure ROM to RAM. We use memcpy_from_ci() to do that.
*/
chip = next_chip(NULL);
xscom_read(chip->id, reg_addr, ®_data);
memcpy_from_ci(secure_rom_mem, (void*) reg_data,
SECURE_ROM_MEMORY_SIZE);
cvc_register((uint64_t)&secure_rom_mem,
(uint64_t)&secure_rom_mem + SECURE_ROM_MEMORY_SIZE-1);
cvc_service_register(CVC_SHA512_SERVICE, SECURE_ROM_SHA512_OFFSET, 1);
cvc_service_register(CVC_VERIFY_SERVICE, SECURE_ROM_VERIFY_OFFSET, 1);
return 0;
}
int cvc_init(void)
{
struct dt_node *node;
int version;
int rc = 0;
if (cvc)
return 0;
node = dt_find_by_path(dt_root, "/ibm,secureboot");
if (!node)
return -1;
if (!secureboot_is_compatible(node, &version, NULL)) {
/**
* @fwts-label CVCNotCompatible
* @fwts-advice Compatible CVC driver not found. Probably,
* hostboot/mambo/skiboot has updated the
* /ibm,secureboot/compatible without adding a driver that
* supports it.
*/
prlog(PR_ERR, "%s FAILED, /ibm,secureboot not compatible.\n",
__func__);
return -1;
}
/* Only in P8 the CVC is stored in a secure ROM */
if (version == IBM_SECUREBOOT_V1 &&
proc_gen == proc_gen_p8) {
rc = cvc_secure_rom_init();
} else {
prlog(PR_ERR, "%s FAILED. /ibm,secureboot not supported\n",
__func__);
return -1;
}
return rc;
}
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