cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rm.c (2127B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright 2020 NXP
      4 *
      5 * File containing client-side RPC functions for the RM service. These
      6 * function are ported to clients that communicate to the SC.
      7 */
      8
      9#include <linux/firmware/imx/svc/rm.h>
     10
     11struct imx_sc_msg_rm_rsrc_owned {
     12	struct imx_sc_rpc_msg hdr;
     13	u16 resource;
     14} __packed __aligned(4);
     15
     16/*
     17 * This function check @resource is owned by current partition or not
     18 *
     19 * @param[in]     ipc         IPC handle
     20 * @param[in]     resource    resource the control is associated with
     21 *
     22 * @return Returns 0 for not owned and 1 for owned.
     23 */
     24bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)
     25{
     26	struct imx_sc_msg_rm_rsrc_owned msg;
     27	struct imx_sc_rpc_msg *hdr = &msg.hdr;
     28
     29	hdr->ver = IMX_SC_RPC_VERSION;
     30	hdr->svc = IMX_SC_RPC_SVC_RM;
     31	hdr->func = IMX_SC_RM_FUNC_IS_RESOURCE_OWNED;
     32	hdr->size = 2;
     33
     34	msg.resource = resource;
     35
     36	/*
     37	 * SCU firmware only returns value 0 or 1
     38	 * for resource owned check which means not owned or owned.
     39	 * So it is always successful.
     40	 */
     41	imx_scu_call_rpc(ipc, &msg, true);
     42
     43	return hdr->func;
     44}
     45EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);
     46
     47struct imx_sc_msg_rm_get_resource_owner {
     48	struct imx_sc_rpc_msg hdr;
     49	union {
     50		struct {
     51			u16 resource;
     52		} req;
     53		struct {
     54			u8 val;
     55		} resp;
     56	} data;
     57} __packed __aligned(4);
     58
     59/*
     60 * This function get @resource partition number
     61 *
     62 * @param[in]     ipc         IPC handle
     63 * @param[in]     resource    resource the control is associated with
     64 * @param[out]    pt          pointer to return the partition number
     65 *
     66 * @return Returns 0 for success and < 0 for errors.
     67 */
     68int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)
     69{
     70	struct imx_sc_msg_rm_get_resource_owner msg;
     71	struct imx_sc_rpc_msg *hdr = &msg.hdr;
     72	int ret;
     73
     74	hdr->ver = IMX_SC_RPC_VERSION;
     75	hdr->svc = IMX_SC_RPC_SVC_RM;
     76	hdr->func = IMX_SC_RM_FUNC_GET_RESOURCE_OWNER;
     77	hdr->size = 2;
     78
     79	msg.data.req.resource = resource;
     80
     81	ret = imx_scu_call_rpc(ipc, &msg, true);
     82	if (ret)
     83		return ret;
     84
     85	if (pt)
     86		*pt = msg.data.resp.val;
     87
     88	return 0;
     89}
     90EXPORT_SYMBOL(imx_sc_rm_get_resource_owner);