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