521 lines
13 KiB
C
521 lines
13 KiB
C
/* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <asm/cacheflush.h>
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#include <mach/scm.h>
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#define SCM_ENOMEM -5
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#define SCM_EOPNOTSUPP -4
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#define SCM_EINVAL_ADDR -3
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#define SCM_EINVAL_ARG -2
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#define SCM_ERROR -1
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#define SCM_INTERRUPTED 1
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static DEFINE_MUTEX(scm_lock);
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#define SCM_BUF_LEN(__cmd_size, __resp_size) \
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(sizeof(struct scm_command) + sizeof(struct scm_response) + \
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__cmd_size + __resp_size)
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/**
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* struct scm_command - one SCM command buffer
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* @len: total available memory for command and response
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* @buf_offset: start of command buffer
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* @resp_hdr_offset: start of response buffer
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* @id: command to be executed
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* @buf: buffer returned from scm_get_command_buffer()
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*
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* An SCM command is laid out in memory as follows:
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*
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* ------------------- <--- struct scm_command
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* | command header |
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* ------------------- <--- scm_get_command_buffer()
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* | command buffer |
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* ------------------- <--- struct scm_response and
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* | response header | scm_command_to_response()
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* ------------------- <--- scm_get_response_buffer()
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* | response buffer |
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* -------------------
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*
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* There can be arbitrary padding between the headers and buffers so
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* you should always use the appropriate scm_get_*_buffer() routines
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* to access the buffers in a safe manner.
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*/
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struct scm_command {
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u32 len;
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u32 buf_offset;
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u32 resp_hdr_offset;
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u32 id;
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u32 buf[0];
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};
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/**
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* struct scm_response - one SCM response buffer
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* @len: total available memory for response
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* @buf_offset: start of response data relative to start of scm_response
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* @is_complete: indicates if the command has finished processing
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*/
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struct scm_response {
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u32 len;
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u32 buf_offset;
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u32 is_complete;
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};
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/**
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* scm_command_to_response() - Get a pointer to a scm_response
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* @cmd: command
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*
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* Returns a pointer to a response for a command.
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*/
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static inline struct scm_response *scm_command_to_response(
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const struct scm_command *cmd)
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{
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return (void *)cmd + cmd->resp_hdr_offset;
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}
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/**
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* scm_get_command_buffer() - Get a pointer to a command buffer
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* @cmd: command
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*
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* Returns a pointer to the command buffer of a command.
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*/
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static inline void *scm_get_command_buffer(const struct scm_command *cmd)
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{
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return (void *)cmd->buf;
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}
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/**
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* scm_get_response_buffer() - Get a pointer to a response buffer
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* @rsp: response
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*
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* Returns a pointer to a response buffer of a response.
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*/
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static inline void *scm_get_response_buffer(const struct scm_response *rsp)
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{
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return (void *)rsp + rsp->buf_offset;
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}
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static int scm_remap_error(int err)
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{
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switch (err) {
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case SCM_ERROR:
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return -EIO;
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case SCM_EINVAL_ADDR:
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case SCM_EINVAL_ARG:
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return -EINVAL;
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case SCM_EOPNOTSUPP:
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return -EOPNOTSUPP;
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case SCM_ENOMEM:
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return -ENOMEM;
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}
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return -EINVAL;
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}
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static u32 smc(u32 cmd_addr)
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{
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int context_id;
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register u32 r0 asm("r0") = 1;
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register u32 r1 asm("r1") = (u32)&context_id;
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register u32 r2 asm("r2") = cmd_addr;
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do {
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r0")
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__asmeq("%2", "r1")
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__asmeq("%3", "r2")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0 @ switch to secure world\n"
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: "=r" (r0)
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: "r" (r0), "r" (r1), "r" (r2)
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: "r3");
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} while (r0 == SCM_INTERRUPTED);
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return r0;
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}
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static int __scm_call(const struct scm_command *cmd)
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{
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int ret;
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u32 cmd_addr = virt_to_phys(cmd);
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/*
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* Flush the entire cache here so callers don't have to remember
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* to flush the cache when passing physical addresses to the secure
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* side in the buffer.
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*/
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flush_cache_all();
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outer_flush_all();
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ret = smc(cmd_addr);
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if (ret < 0)
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ret = scm_remap_error(ret);
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return ret;
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}
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static void scm_inv_range(unsigned long start, unsigned long end)
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{
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u32 cacheline_size, ctr;
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asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
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cacheline_size = 4 << ((ctr >> 16) & 0xf);
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start = round_down(start, cacheline_size);
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end = round_up(end, cacheline_size);
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outer_inv_range(start, end);
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while (start < end) {
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asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
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: "memory");
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start += cacheline_size;
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}
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dsb();
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isb();
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}
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/**
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* scm_call_common() - Send an SCM command
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* @svc_id: service identifier
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* @cmd_id: command identifier
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* @cmd_buf: command buffer
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* @cmd_len: length of the command buffer
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* @resp_buf: response buffer
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* @resp_len: length of the response buffer
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* @scm_buf: internal scm structure used for passing data
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* @scm_buf_len: length of the internal scm structure
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*
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* Core function to scm call. Initializes the given cmd structure with
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* appropriate values and makes the actual scm call. Validation of cmd
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* pointer and length must occur in the calling function.
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*
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* Returns the appropriate error code from the scm call
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*/
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static int scm_call_common(u32 svc_id, u32 cmd_id, const void *cmd_buf,
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size_t cmd_len, void *resp_buf, size_t resp_len,
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struct scm_command *scm_buf,
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size_t scm_buf_length)
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{
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int ret;
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struct scm_response *rsp;
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unsigned long start, end;
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scm_buf->len = scm_buf_length;
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scm_buf->buf_offset = offsetof(struct scm_command, buf);
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scm_buf->resp_hdr_offset = scm_buf->buf_offset + cmd_len;
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scm_buf->id = (svc_id << 10) | cmd_id;
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if (cmd_buf)
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memcpy(scm_get_command_buffer(scm_buf), cmd_buf, cmd_len);
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mutex_lock(&scm_lock);
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ret = __scm_call(scm_buf);
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mutex_unlock(&scm_lock);
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if (ret)
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return ret;
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rsp = scm_command_to_response(scm_buf);
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start = (unsigned long)rsp;
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do {
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scm_inv_range(start, start + sizeof(*rsp));
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} while (!rsp->is_complete);
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end = (unsigned long)scm_get_response_buffer(rsp) + resp_len;
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scm_inv_range(start, end);
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if (resp_buf)
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memcpy(resp_buf, scm_get_response_buffer(rsp), resp_len);
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return ret;
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}
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/**
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* scm_call_noalloc - Send an SCM command
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*
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* Same as scm_call except clients pass in a buffer (@scm_buf) to be used for
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* scm internal structures. The buffer should be allocated with
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* DEFINE_SCM_BUFFER to account for the proper alignment and size.
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*/
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int scm_call_noalloc(u32 svc_id, u32 cmd_id, const void *cmd_buf,
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size_t cmd_len, void *resp_buf, size_t resp_len,
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void *scm_buf, size_t scm_buf_len)
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{
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int ret;
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size_t len = SCM_BUF_LEN(cmd_len, resp_len);
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if (cmd_len > scm_buf_len || resp_len > scm_buf_len ||
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len > scm_buf_len)
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return -EINVAL;
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if (!IS_ALIGNED((unsigned long)scm_buf, PAGE_SIZE))
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return -EINVAL;
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memset(scm_buf, 0, scm_buf_len);
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ret = scm_call_common(svc_id, cmd_id, cmd_buf, cmd_len, resp_buf,
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resp_len, scm_buf, len);
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return ret;
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}
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/**
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* scm_call() - Send an SCM command
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* @svc_id: service identifier
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* @cmd_id: command identifier
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* @cmd_buf: command buffer
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* @cmd_len: length of the command buffer
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* @resp_buf: response buffer
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* @resp_len: length of the response buffer
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*
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* Sends a command to the SCM and waits for the command to finish processing.
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*/
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int scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf, size_t cmd_len,
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void *resp_buf, size_t resp_len)
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{
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struct scm_command *cmd;
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int ret;
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size_t len = SCM_BUF_LEN(cmd_len, resp_len);
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if (cmd_len > len || resp_len > len)
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return -EINVAL;
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cmd = kzalloc(PAGE_ALIGN(len), GFP_KERNEL);
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if (!cmd)
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return -ENOMEM;
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ret = scm_call_common(svc_id, cmd_id, cmd_buf, cmd_len, resp_buf,
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resp_len, cmd, len);
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kfree(cmd);
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return ret;
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}
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EXPORT_SYMBOL(scm_call);
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#define SCM_CLASS_REGISTER (0x2 << 8)
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#define SCM_MASK_IRQS BIT(5)
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#define SCM_ATOMIC(svc, cmd, n) (((((svc) << 10)|((cmd) & 0x3ff)) << 12) | \
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SCM_CLASS_REGISTER | \
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SCM_MASK_IRQS | \
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(n & 0xf))
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/**
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* scm_call_atomic1() - Send an atomic SCM command with one argument
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* @svc_id: service identifier
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* @cmd_id: command identifier
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* @arg1: first argument
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*
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* This shall only be used with commands that are guaranteed to be
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* uninterruptable, atomic and SMP safe.
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*/
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s32 scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
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{
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int context_id;
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register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 1);
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register u32 r1 asm("r1") = (u32)&context_id;
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register u32 r2 asm("r2") = arg1;
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r0")
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__asmeq("%2", "r1")
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__asmeq("%3", "r2")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0 @ switch to secure world\n"
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: "=r" (r0)
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: "r" (r0), "r" (r1), "r" (r2)
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: "r3");
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return r0;
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}
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EXPORT_SYMBOL(scm_call_atomic1);
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/**
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* scm_call_atomic2() - Send an atomic SCM command with two arguments
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* @svc_id: service identifier
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* @cmd_id: command identifier
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* @arg1: first argument
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* @arg2: second argument
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*
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* This shall only be used with commands that are guaranteed to be
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* uninterruptable, atomic and SMP safe.
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*/
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s32 scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2)
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{
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int context_id;
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register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 2);
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register u32 r1 asm("r1") = (u32)&context_id;
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register u32 r2 asm("r2") = arg1;
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register u32 r3 asm("r3") = arg2;
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r0")
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__asmeq("%2", "r1")
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__asmeq("%3", "r2")
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__asmeq("%4", "r3")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0 @ switch to secure world\n"
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: "=r" (r0)
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: "r" (r0), "r" (r1), "r" (r2), "r" (r3));
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return r0;
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}
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EXPORT_SYMBOL(scm_call_atomic2);
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/**
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* scm_call_atomic3() - Send an atomic SCM command with three arguments
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* @svc_id: service identifier
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* @cmd_id: command identifier
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* @arg1: first argument
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* @arg2: second argument
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* @arg3: third argument
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*
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* This shall only be used with commands that are guaranteed to be
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* uninterruptable, atomic and SMP safe.
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*/
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s32 scm_call_atomic3(u32 svc, u32 cmd, u32 arg1, u32 arg2, u32 arg3)
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{
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int context_id;
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register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 3);
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register u32 r1 asm("r1") = (u32)&context_id;
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register u32 r2 asm("r2") = arg1;
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register u32 r3 asm("r3") = arg2;
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register u32 r4 asm("r4") = arg3;
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r0")
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__asmeq("%2", "r1")
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__asmeq("%3", "r2")
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__asmeq("%4", "r3")
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__asmeq("%5", "r4")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0 @ switch to secure world\n"
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: "=r" (r0)
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: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4));
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return r0;
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}
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EXPORT_SYMBOL(scm_call_atomic3);
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s32 scm_call_atomic4_3(u32 svc, u32 cmd, u32 arg1, u32 arg2,
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u32 arg3, u32 arg4, u32 *ret1, u32 *ret2)
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{
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int ret;
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int context_id;
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register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 4);
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register u32 r1 asm("r1") = (u32)&context_id;
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register u32 r2 asm("r2") = arg1;
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register u32 r3 asm("r3") = arg2;
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register u32 r4 asm("r4") = arg3;
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register u32 r5 asm("r5") = arg4;
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r1")
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__asmeq("%2", "r2")
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__asmeq("%3", "r0")
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__asmeq("%4", "r1")
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__asmeq("%5", "r2")
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__asmeq("%6", "r3")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0 @ switch to secure world\n"
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: "=r" (r0), "=r" (r1), "=r" (r2)
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: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5));
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ret = r0;
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if (ret1)
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*ret1 = r1;
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if (ret2)
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*ret2 = r2;
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return r0;
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}
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EXPORT_SYMBOL(scm_call_atomic4_3);
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u32 scm_get_version(void)
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{
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int context_id;
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static u32 version = -1;
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register u32 r0 asm("r0");
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register u32 r1 asm("r1");
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if (version != -1)
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return version;
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mutex_lock(&scm_lock);
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r0 = 0x1 << 8;
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r1 = (u32)&context_id;
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do {
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r1")
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__asmeq("%2", "r0")
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__asmeq("%3", "r1")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0 @ switch to secure world\n"
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: "=r" (r0), "=r" (r1)
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: "r" (r0), "r" (r1)
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: "r2", "r3");
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} while (r0 == SCM_INTERRUPTED);
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version = r1;
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mutex_unlock(&scm_lock);
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return version;
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}
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EXPORT_SYMBOL(scm_get_version);
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#define IS_CALL_AVAIL_CMD 1
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int scm_is_call_available(u32 svc_id, u32 cmd_id)
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{
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int ret;
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u32 svc_cmd = (svc_id << 10) | cmd_id;
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u32 ret_val = 0;
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ret = scm_call(SCM_SVC_INFO, IS_CALL_AVAIL_CMD, &svc_cmd,
|
|
sizeof(svc_cmd), &ret_val, sizeof(ret_val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
return ret_val;
|
|
}
|
|
EXPORT_SYMBOL(scm_is_call_available);
|
|
|
|
#define GET_FEAT_VERSION_CMD 3
|
|
int scm_get_feat_version(u32 feat)
|
|
{
|
|
if (scm_is_call_available(SCM_SVC_INFO, GET_FEAT_VERSION_CMD)) {
|
|
u32 version;
|
|
if (!scm_call(SCM_SVC_INFO, GET_FEAT_VERSION_CMD, &feat,
|
|
sizeof(feat), &version, sizeof(version)))
|
|
return version;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(scm_get_feat_version);
|
|
|