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- // 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 <cpu_func.h>
- #include <log.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);
- }
- }
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