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6d132b2b09
Create a few public APIs which rely on secure world ROM/HAL APIs for their implementation. These are intended to be used to reserve a portion of the EMIF memory and configure hardware firewalls around that region to prevent public code from manipulating or interfering with that memory. Signed-off-by: Daniel Allred <d-allred@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*
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*
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* Security related functions for OMAP5 class devices
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*
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* (C) Copyright 2016
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* Texas Instruments, <www.ti.com>
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*
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* Daniel Allred <d-allred@ti.com>
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* Harinarayan Bhatta <harinarayan@ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <stdarg.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/omap_common.h>
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#include <asm/omap_sec_common.h>
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#include <asm/spl.h>
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#include <spl.h>
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/* Index for signature PPA-based TI HAL APIs */
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#define PPA_HAL_SERVICES_START_INDEX (0x200)
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#define PPA_SERV_HAL_SETUP_SEC_RESVD_REGION (PPA_HAL_SERVICES_START_INDEX + 25)
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#define PPA_SERV_HAL_SETUP_EMIF_FW_REGION (PPA_HAL_SERVICES_START_INDEX + 26)
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#define PPA_SERV_HAL_LOCK_EMIF_FW (PPA_HAL_SERVICES_START_INDEX + 27)
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static u32 get_sec_mem_start(void)
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{
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u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START;
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u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE;
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/*
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* Total reserved region is all contiguous with protected
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* region coming first, followed by the non-secure region.
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* If 0x0 start address is given, we simply put the reserved
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* region at the end of the external DRAM.
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*/
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if (sec_mem_start == 0)
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sec_mem_start =
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(CONFIG_SYS_SDRAM_BASE +
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(omap_sdram_size() - sec_mem_size));
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return sec_mem_start;
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}
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int secure_emif_firewall_setup(uint8_t region_num, uint32_t start_addr,
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uint32_t size, uint32_t access_perm,
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uint32_t initiator_perm)
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{
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int result = 1;
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/*
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* Call PPA HAL API to do any other general firewall
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* configuration for regions 1-6 of the EMIF firewall.
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*/
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debug("%s: regionNum = %x, startAddr = %x, size = %x", __func__,
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region_num, start_addr, size);
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result = secure_rom_call(
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PPA_SERV_HAL_SETUP_EMIF_FW_REGION, 0, 0, 4,
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(start_addr & 0xFFFFFFF0) | (region_num & 0x0F),
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size, access_perm, initiator_perm);
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if (result != 0) {
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puts("Secure EMIF Firewall Setup failed!\n");
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debug("Return Value = %x\n", result);
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}
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return result;
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}
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#if (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE < \
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CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE)
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#error "TI Secure EMIF: Protected size cannot be larger than total size."
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#endif
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int secure_emif_reserve(void)
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{
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int result = 1;
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u32 sec_mem_start = get_sec_mem_start();
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u32 sec_prot_size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
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/* If there is no protected region, there is no reservation to make */
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if (sec_prot_size == 0)
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return 0;
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/*
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* Call PPA HAL API to reserve a chunk of EMIF SDRAM
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* for secure world use. This region should be carved out
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* from use by any public code. EMIF firewall region 7
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* will be used to protect this block of memory.
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*/
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result = secure_rom_call(
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PPA_SERV_HAL_SETUP_SEC_RESVD_REGION,
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0, 0, 2, sec_mem_start, sec_prot_size);
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if (result != 0) {
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puts("SDRAM Firewall: Secure memory reservation failed!\n");
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debug("Return Value = %x\n", result);
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}
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return result;
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}
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int secure_emif_firewall_lock(void)
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{
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int result = 1;
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/*
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* Call PPA HAL API to lock the EMIF firewall configurations.
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* After this API is called, none of the PPA HAL APIs for
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* configuring the EMIF firewalls will be usable again (that
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* is, calls to those APIs will return failure and have no
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* effect).
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*/
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result = secure_rom_call(
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PPA_SERV_HAL_LOCK_EMIF_FW,
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0, 0, 0);
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if (result != 0) {
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puts("Secure EMIF Firewall Lock failed!\n");
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debug("Return Value = %x\n", result);
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}
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return result;
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}
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