/* adi_64.c: support for ADI (Application Data Integrity) feature on
* sparc m7 and newer processors. This feature is also known as
* SSM (Silicon Secured Memory).
*
* Copyright (C) 2016 Oracle and/or its affiliates. All rights reserved.
* Author: Khalid Aziz (khalid.aziz@oracle.com)
*
* This work is licensed under the terms of the GNU GPL, version 2.
*/
#include <linux/init.h>
#include <asm/mdesc.h>
#include <asm/adi_64.h>
struct adi_config adi_state;
/* mdesc_adi_init() : Parse machine description provided by the
* hypervisor to detect ADI capabilities
*
* Hypervisor reports ADI capabilities of platform in "hwcap-list" property
* for "cpu" node. If the platform supports ADI, "hwcap-list" property
* contains the keyword "adp". If the platform supports ADI, "platform"
* node will contain "adp-blksz", "adp-nbits" and "ue-on-adp" properties
* to describe the ADI capabilities.
*/
void __init mdesc_adi_init(void)
{
struct mdesc_handle *hp = mdesc_grab();
const char *prop;
u64 pn, *val;
int len;
if (!hp)
goto adi_not_found;
pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "cpu");
if (pn == MDESC_NODE_NULL)
goto adi_not_found;
prop = mdesc_get_property(hp, pn, "hwcap-list", &len);
if (!prop)
goto adi_not_found;
/*
* Look for "adp" keyword in hwcap-list which would indicate
* ADI support
*/
adi_state.enabled = false;
while (len) {
int plen;
if (!strcmp(prop, "adp")) {
adi_state.enabled = true;
break;
}
plen = strlen(prop) + 1;
prop += plen;
len -= plen;
}
if (!adi_state.enabled)
goto adi_not_found;
/* Find the ADI properties in "platform" node. If all ADI
* properties are not found, ADI support is incomplete and
* do not enable ADI in the kernel.
*/
pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
if (pn == MDESC_NODE_NULL)
goto adi_not_found;
val = (u64 *) mdesc_get_property(hp, pn, "adp-blksz", &len);
if (!val)
goto adi_not_found;
adi_state.caps.blksz = *val;
val = (u64 *) mdesc_get_property(hp, pn, "adp-nbits", &len);
if (!val)
goto adi_not_found;
adi_state.caps.nbits = *val;
val = (u64 *) mdesc_get_property(hp, pn, "ue-on-adp", &len);
if (!val)
goto adi_not_found;
adi_state.caps.ue_on_adi = *val;
mdesc_release(hp);
return;
adi_not_found:
adi_state.enabled = false;
adi_state.caps.blksz = 0;
adi_state.caps.nbits = 0;
if (hp)
mdesc_release(hp);
}
