mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-26 04:53:42 +00:00
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* Switch to non-secure mode
|
||
|
|
*
|
||
|
|
* Copyright (c) 2018 Heinrich Schuchardt
|
||
|
|
*
|
||
|
|
* This module contains the ARMv7 specific code required for leaving the
|
||
|
|
* secure mode before booting an operating system.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <common.h>
|
||
|
|
#include <bootm.h>
|
||
|
|
#include <asm/armv7.h>
|
||
|
|
#include <asm/secure.h>
|
||
|
|
#include <asm/setjmp.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* entry_non_secure() - entry point when switching to non-secure mode
|
||
|
|
*
|
||
|
|
* When switching to non-secure mode switch_to_non_secure_mode() calls this
|
||
|
|
* function passing a jump buffer. We use this jump buffer to restore the
|
||
|
|
* original stack and register state.
|
||
|
|
*
|
||
|
|
* @non_secure_jmp: jump buffer for restoring stack and registers
|
||
|
|
*/
|
||
|
|
static void entry_non_secure(struct jmp_buf_data *non_secure_jmp)
|
||
|
|
{
|
||
|
|
dcache_enable();
|
||
|
|
debug("Reached non-secure mode\n");
|
||
|
|
|
||
|
|
/* Restore stack and registers saved in switch_to_non_secure_mode() */
|
||
|
|
longjmp(non_secure_jmp, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* switch_to_non_secure_mode() - switch to non-secure mode
|
||
|
|
*
|
||
|
|
* Operating systems may expect to run in non-secure mode. Here we check if
|
||
|
|
* we are running in secure mode and switch to non-secure mode if necessary.
|
||
|
|
*/
|
||
|
|
void switch_to_non_secure_mode(void)
|
||
|
|
{
|
||
|
|
static bool is_nonsec;
|
||
|
|
struct jmp_buf_data non_secure_jmp;
|
||
|
|
|
||
|
|
if (armv7_boot_nonsec() && !is_nonsec) {
|
||
|
|
if (setjmp(&non_secure_jmp))
|
||
|
|
return;
|
||
|
|
dcache_disable(); /* flush cache before switch to HYP */
|
||
|
|
armv7_init_nonsec();
|
||
|
|
is_nonsec = true;
|
||
|
|
secure_ram_addr(_do_nonsec_entry)(entry_non_secure,
|
||
|
|
(uintptr_t)&non_secure_jmp,
|
||
|
|
0, 0);
|
||
|
|
}
|
||
|
|
}
|