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