261 lines
6.4 KiB
C
261 lines
6.4 KiB
C
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/*
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* Copyright (c) 2015 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* EXYNOS - EL3 monitor support
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* Author: Jang Hyunsung <hs79.jang@samsung.com>
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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 as
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* published by the Free Software Foundation.
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*/
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#include <linux/slab.h>
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#include <linux/smc.h>
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#include <asm/cacheflush.h>
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#include <asm/memory.h>
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#include <soc/samsung/exynos-el3_mon.h>
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static char *smc_debug_mem;
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#ifdef CONFIG_EXYNOS_KERNEL_PROTECTION
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static int __init exynos_protect_kernel_text(void)
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{
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int ret = 0;
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unsigned long ktext_start_va = 0;
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unsigned long ktext_start_pa = 0;
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unsigned long ktext_end_va = 0;
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unsigned long ktext_end_pa = 0;
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/* Get virtual addresses of kernel text */
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ktext_start_va = (unsigned long)_text;
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if (!ktext_start_va) {
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pr_err("%s: [ERROR] Kernel text start address is invalid\n",
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__func__);
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return -1;
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}
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ktext_end_va = (unsigned long)_etext;
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if (!ktext_end_va) {
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pr_err("%s: [ERROR] Kernel text end address is invalid\n",
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__func__);
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return -1;
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}
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/* Translate VA to PA */
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ktext_start_pa = (unsigned long)__pa_symbol(_text);
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ktext_end_pa = (unsigned long)__pa_symbol(_etext);
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pr_info("%s: Kernel text start VA(%#lx), PA(%#lx)\n",
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__func__, ktext_start_va, ktext_start_pa);
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pr_info("%s: Kernel text end VA(%#lx), PA(%#lx)\n",
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__func__, ktext_end_va, ktext_end_pa);
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/* Request to protect kernel text area */
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ret = exynos_smc(SMC_CMD_PROTECT_KERNEL_TEXT,
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ktext_start_pa,
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ktext_end_pa,
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0);
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if (ret) {
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switch (ret) {
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case EXYNOS_ERROR_NOT_VALID_ADDRESS:
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pr_err("%s: [ERROR] Invalid address\n", __func__);
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break;
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case EXYNOS_ERROR_TZASC_WRONG_REGION:
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pr_err("%s: [ERROR] Wrong TZASC region\n", __func__);
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break;
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case EXYNOS_ERROR_ALREADY_INITIALIZED:
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pr_err("%s: [ERROR] Already initialized\n", __func__);
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break;
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default:
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pr_err("%s: [ERROR] Unknown error [ret = %#x]\n",
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__func__, ret);
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break;
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}
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return ret;
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}
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pr_info("%s: Success to set Kernel code as read-only\n", __func__);
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return 0;
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}
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core_initcall(exynos_protect_kernel_text);
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#endif
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static int __init exynos_set_debug_mem(void)
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{
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int ret;
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char *phys;
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unsigned int size = PAGE_SIZE * 2;
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smc_debug_mem = kmalloc(size, GFP_KERNEL);
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if (!smc_debug_mem) {
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pr_err("%s: kmalloc for smc_debug failed.\n", __func__);
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return 0;
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}
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/* to map & flush memory */
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memset(smc_debug_mem, 0x00, size);
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__flush_dcache_area(smc_debug_mem, size);
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phys = (char *)virt_to_phys(smc_debug_mem);
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pr_err("%s: alloc kmem for smc_dbg virt: 0x%p phys: 0x%p size: %d.\n",
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__func__, smc_debug_mem, phys, size);
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ret = exynos_smc(SMC_CMD_SET_DEBUG_MEM, (u64)phys, (u64)size, 0);
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/* correct return value is input size */
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if (ret != size) {
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pr_err("%s: Can not set the address to el3 monitor. "
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"ret = 0x%x. free the kmem\n", __func__, ret);
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kfree(smc_debug_mem);
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}
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return 0;
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}
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arch_initcall(exynos_set_debug_mem);
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static void exynos_smart_exception_handler(unsigned int id,
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unsigned long elr, unsigned long esr,
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unsigned long sctlr, unsigned long ttbr,
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unsigned long tcr, unsigned long x6,
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unsigned int offset)
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{
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int i;
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unsigned long *ptr;
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unsigned long tmp;
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pr_err("========================================="
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"=========================================\n");
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if (id)
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pr_err("%s: There has been an unexpected exception from "
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"a LDFW which has smc id 0x%x\n\n", __func__, id);
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else
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pr_err("%s: There has been an unexpected exception from "
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"the EL3 monitor.\n\n", __func__);
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if (id) {
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pr_err("elr_el1 : 0x%016lx, \tesr_el1 : 0x%016lx\n",
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elr, esr);
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pr_err("sctlr_el1 : 0x%016lx, \tttbr_el1 : 0x%016lx\n",
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sctlr, ttbr);
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pr_err("tcr_el1 : 0x%016lx, \tlr (EL1) : 0x%016lx\n\n",
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tcr, x6);
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} else {
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pr_err("elr_el3 : 0x%016lx, \tesr_el3 : 0x%016lx\n",
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elr, esr);
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pr_err("sctlr_el3 : 0x%016lx, \tttbr_el3 : 0x%016lx\n",
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sctlr, ttbr);
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pr_err("tcr_el3 : 0x%016lx, \tscr_el3 : 0x%016lx\n\n",
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tcr, x6);
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if ((offset > 0x0 && offset < (PAGE_SIZE * 2))
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&& !(offset % 0x8) && (smc_debug_mem)) {
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/* Invalidate smc_debug_mem for cache coherency */
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__inval_dcache_area(smc_debug_mem, PAGE_SIZE * 2);
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tmp = (unsigned long)smc_debug_mem;
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tmp += (unsigned long)offset;
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ptr = (unsigned long *)tmp;
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for (i = 0; i < 15; i++) {
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pr_err("x%02d : 0x%016lx, \tx%02d : 0x%016lx\n",
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i * 2, ptr[i * 2],
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i * 2 + 1, ptr[i * 2 + 1]);
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}
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pr_err("x%02d : 0x%016lx\n", i * 2, ptr[i * 2]);
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}
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}
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pr_err("\n[WARNING] IT'S GOING TO CAUSE KERNEL PANIC FOR DEBUGGING.\n\n");
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pr_err("========================================="
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"=========================================\n");
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/* make kernel panic */
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BUG();
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/* SHOULD NOT be here */
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while(1);
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}
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static int __init exynos_set_seh_address(void)
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{
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int ret;
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unsigned long addr = (unsigned long)exynos_smart_exception_handler;
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pr_info("%s: send smc call with SMC_CMD_SET_SEH_ADDRESS.\n", __func__);
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ret = exynos_smc(SMC_CMD_SET_SEH_ADDRESS, addr, 0, 0);
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/* return value not zero means failure */
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if (ret)
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pr_err("%s: did not set the seh address to el3 monitor. "
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"ret = 0x%x.\n", __func__, ret);
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else
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pr_err("%s: set the seh address to el3 monitor well.\n",
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__func__);
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return 0;
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}
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arch_initcall(exynos_set_seh_address);
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/*
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* The function to save TZPC of power domains
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* by calling SMC to EL3 Monitor
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*
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* Power domains for runtime PM
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*/
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int exynos_pd_tz_save(unsigned int addr)
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{
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return exynos_smc(SMC_CMD_PREAPRE_PD_ONOFF,
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EXYNOS_GET_IN_PD_DOWN,
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addr,
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EXYNOS_PD_RUNTIME_PM);
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}
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/*
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* The function to restore TZPC of power domains
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* by calling SMC to EL3 Monitor
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*
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* Power domains for runtime PM
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*/
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int exynos_pd_tz_restore(unsigned int addr)
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{
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return exynos_smc(SMC_CMD_PREAPRE_PD_ONOFF,
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EXYNOS_WAKEUP_PD_DOWN,
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addr,
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EXYNOS_PD_RUNTIME_PM);
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}
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/*
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* The function to save TZPC of power domain
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* by calling SMC to EL3 Monitor
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*
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* Power domains for connectivity
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*/
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int exynos_conn_tz_save(unsigned int addr)
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{
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return exynos_smc(SMC_CMD_PREAPRE_PD_ONOFF,
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EXYNOS_GET_IN_PD_DOWN,
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addr,
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EXYNOS_PD_CONNECTIVITY);
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}
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/*
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* The function to restore TZPC of power domain
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* by calling SMC to EL3 Monitor
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*
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* Power domains for connectivity
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*/
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int exynos_conn_tz_restore(unsigned int addr)
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{
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return exynos_smc(SMC_CMD_PREAPRE_PD_ONOFF,
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EXYNOS_WAKEUP_PD_DOWN,
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addr,
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EXYNOS_PD_CONNECTIVITY);
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}
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