mirror of
https://github.com/AsahiLinux/u-boot
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f7ae49fc4f
Move this header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
381 lines
11 KiB
C
381 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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*
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* Common security related functions for OMAP devices
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*
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* (C) Copyright 2016-2017
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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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* Andreas Dannenberg <dannenberg@ti.com>
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* Harinarayan Bhatta <harinarayan@ti.com>
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* Andrew F. Davis <afd@ti.com>
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*/
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#include <common.h>
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#include <command.h>
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#include <cpu_func.h>
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#include <hang.h>
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#include <init.h>
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#include <log.h>
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#include <stdarg.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/cache.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 <asm/ti-common/sys_proto.h>
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#include <mapmem.h>
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#include <spl.h>
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#include <tee/optee.h>
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/* Index for signature verify ROM API */
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#ifdef CONFIG_AM33XX
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#define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000C)
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#else
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#define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000E)
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#endif
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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_TEE_LOAD_MASTER (PPA_HAL_SERVICES_START_INDEX + 23)
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#define PPA_SERV_HAL_TEE_LOAD_SLAVE (PPA_HAL_SERVICES_START_INDEX + 24)
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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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/* Offset of header size if image is signed as ISW */
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#define HEADER_SIZE_OFFSET (0x6D)
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int tee_loaded = 0;
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/* Argument for PPA_SERV_HAL_TEE_LOAD_MASTER */
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struct ppa_tee_load_info {
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u32 tee_sec_mem_start; /* Physical start address reserved for TEE */
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u32 tee_sec_mem_size; /* Size of the memory reserved for TEE */
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u32 tee_cert_start; /* Address where signed TEE binary is loaded */
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u32 tee_cert_size; /* Size of TEE certificate (signed binary) */
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u32 tee_jump_addr; /* Address to jump to start TEE execution */
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u32 tee_arg0; /* argument to TEE jump function, in r0 */
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};
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static uint32_t secure_rom_call_args[5] __aligned(ARCH_DMA_MINALIGN) __section(".data");
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u32 secure_rom_call(u32 service, u32 proc_id, u32 flag, ...)
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{
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int i;
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u32 num_args;
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va_list ap;
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va_start(ap, flag);
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num_args = va_arg(ap, u32);
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if (num_args > 4) {
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va_end(ap);
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return 1;
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}
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/* Copy args to aligned args structure */
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for (i = 0; i < num_args; i++)
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secure_rom_call_args[i + 1] = va_arg(ap, u32);
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secure_rom_call_args[0] = num_args;
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va_end(ap);
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/* if data cache is enabled, flush the aligned args structure */
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flush_dcache_range(
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(unsigned int)&secure_rom_call_args[0],
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(unsigned int)&secure_rom_call_args[0] +
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roundup(sizeof(secure_rom_call_args), ARCH_DMA_MINALIGN));
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return omap_smc_sec(service, proc_id, flag, secure_rom_call_args);
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}
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static u32 find_sig_start(char *image, size_t size)
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{
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char *image_end = image + size;
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char *sig_start_magic = "CERT_";
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int magic_str_len = strlen(sig_start_magic);
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char *ch;
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while (--image_end > image) {
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if (*image_end == '_') {
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ch = image_end - magic_str_len + 1;
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if (!strncmp(ch, sig_start_magic, magic_str_len))
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return (u32)ch;
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}
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}
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return 0;
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}
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int secure_boot_verify_image(void **image, size_t *size)
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{
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int result = 1;
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u32 cert_addr, sig_addr;
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size_t cert_size;
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/* Perform cache writeback on input buffer */
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flush_dcache_range(
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rounddown((u32)*image, ARCH_DMA_MINALIGN),
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roundup((u32)*image + *size, ARCH_DMA_MINALIGN));
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cert_addr = (uint32_t)*image;
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sig_addr = find_sig_start((char *)*image, *size);
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if (sig_addr == 0) {
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printf("No signature found in image!\n");
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result = 1;
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goto auth_exit;
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}
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*size = sig_addr - cert_addr; /* Subtract out the signature size */
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/* Subtract header if present */
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if (strncmp((char *)sig_addr, "CERT_ISW_", 9) == 0)
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*size -= ((u32 *)*image)[HEADER_SIZE_OFFSET];
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cert_size = *size;
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/* Check if image load address is 32-bit aligned */
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if (!IS_ALIGNED(cert_addr, 4)) {
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printf("Image is not 4-byte aligned!\n");
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result = 1;
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goto auth_exit;
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}
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/* Image size also should be multiple of 4 */
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if (!IS_ALIGNED(cert_size, 4)) {
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printf("Image size is not 4-byte aligned!\n");
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result = 1;
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goto auth_exit;
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}
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/* Call ROM HAL API to verify certificate signature */
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debug("%s: load_addr = %x, size = %x, sig_addr = %x\n", __func__,
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cert_addr, cert_size, sig_addr);
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result = secure_rom_call(
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API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX, 0, 0,
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4, cert_addr, cert_size, sig_addr, 0xFFFFFFFF);
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/* Perform cache writeback on output buffer */
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flush_dcache_range(
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rounddown((u32)*image, ARCH_DMA_MINALIGN),
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roundup((u32)*image + *size, ARCH_DMA_MINALIGN));
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auth_exit:
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if (result != 0) {
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printf("Authentication failed!\n");
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printf("Return Value = %08X\n", result);
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hang();
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}
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/*
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* Output notification of successful authentication to re-assure the
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* user that the secure code is being processed as expected. However
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* suppress any such log output in case of building for SPL and booting
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* via YMODEM. This is done to avoid disturbing the YMODEM serial
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* protocol transactions.
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*/
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if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
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IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
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spl_boot_device() == BOOT_DEVICE_UART))
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printf("Authentication passed\n");
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return result;
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}
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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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#if defined(CONFIG_OMAP54XX)
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omap_sdram_size()
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#else
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get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
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CONFIG_MAX_RAM_BANK_SIZE)
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#endif
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- 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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static struct ppa_tee_load_info tee_info __aligned(ARCH_DMA_MINALIGN);
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int secure_tee_install(u32 addr)
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{
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struct optee_header *hdr;
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void *loadptr;
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u32 tee_file_size;
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u32 sec_mem_start = get_sec_mem_start();
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const u32 size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
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u32 ret;
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/* If there is no protected region, there is no place to put the TEE */
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if (size == 0) {
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printf("Error loading TEE, no protected memory region available\n");
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return -ENOBUFS;
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}
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hdr = (struct optee_header *)map_sysmem(addr, sizeof(struct optee_header));
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/* 280 bytes = size of signature */
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tee_file_size = hdr->init_size + hdr->paged_size +
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sizeof(struct optee_header) + 280;
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if ((hdr->magic != OPTEE_MAGIC) ||
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(hdr->version != OPTEE_VERSION) ||
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(tee_file_size > size)) {
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printf("Error in TEE header. Check firewall and TEE sizes\n");
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unmap_sysmem(hdr);
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return CMD_RET_FAILURE;
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}
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tee_info.tee_sec_mem_start = sec_mem_start;
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tee_info.tee_sec_mem_size = size;
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tee_info.tee_jump_addr = hdr->init_load_addr_lo;
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tee_info.tee_cert_start = addr;
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tee_info.tee_cert_size = tee_file_size;
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tee_info.tee_arg0 = hdr->init_size + tee_info.tee_jump_addr;
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unmap_sysmem(hdr);
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loadptr = map_sysmem(addr, tee_file_size);
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debug("tee_info.tee_sec_mem_start= %08X\n", tee_info.tee_sec_mem_start);
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debug("tee_info.tee_sec_mem_size = %08X\n", tee_info.tee_sec_mem_size);
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debug("tee_info.tee_jump_addr = %08X\n", tee_info.tee_jump_addr);
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debug("tee_info.tee_cert_start = %08X\n", tee_info.tee_cert_start);
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debug("tee_info.tee_cert_size = %08X\n", tee_info.tee_cert_size);
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debug("tee_info.tee_arg0 = %08X\n", tee_info.tee_arg0);
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debug("tee_file_size = %d\n", tee_file_size);
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#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
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flush_dcache_range(
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rounddown((u32)loadptr, ARCH_DMA_MINALIGN),
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roundup((u32)loadptr + tee_file_size, ARCH_DMA_MINALIGN));
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flush_dcache_range((u32)&tee_info, (u32)&tee_info +
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roundup(sizeof(tee_info), ARCH_DMA_MINALIGN));
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#endif
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unmap_sysmem(loadptr);
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ret = secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info);
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if (ret) {
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printf("TEE_LOAD_MASTER Failed\n");
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return ret;
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}
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printf("TEE_LOAD_MASTER Done\n");
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#if defined(CONFIG_OMAP54XX)
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if (!is_dra72x()) {
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u32 *smc_cpu1_params;
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/* Reuse the tee_info buffer for SMC params */
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smc_cpu1_params = (u32 *)&tee_info;
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smc_cpu1_params[0] = 0;
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#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
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flush_dcache_range((u32)smc_cpu1_params, (u32)smc_cpu1_params +
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roundup(sizeof(u32), ARCH_DMA_MINALIGN));
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#endif
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ret = omap_smc_sec_cpu1(PPA_SERV_HAL_TEE_LOAD_SLAVE, 0, 0,
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smc_cpu1_params);
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if (ret) {
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printf("TEE_LOAD_SLAVE Failed\n");
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return ret;
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}
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printf("TEE_LOAD_SLAVE Done\n");
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}
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#endif
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tee_loaded = 1;
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return 0;
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}
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