u-boot/arch/arm/mach-omap2/omap5/sec-fxns.c
Harinarayan Bhatta 57de1ea5be arm: omap5: Add TEE loading support
secure_tee_install is used to install and initialize a secure TEE OS such as
Linaro OP-TEE into the secure world. This function takes in the address
where the signed TEE image is loaded as an argument. The signed TEE image
consists of a header (struct tee_header), TEE code+data followed by the
signature generated using image signing tool from TI security development
package (SECDEV). Refer to README.ti-secure for more information.

This function uses 2 new secure APIs.

1. PPA_SERV_HAL_TEE_LOAD_MASTER - Must be called on CPU Core 0. Protected
   memory for TEE must be reserved before calling this function. This API
   needs arguments filled into struct ppa_tee_load_info. The TEE image is
   authenticated and if there are no errors, the control passes to the TEE
   entry point.

2. PPA_SERV_HAL_TEE_LOAD_SLAVE - Called on other CPU cores only after
   a TEE_LOAD_MASTER call. Takes no arguments. Checks if TEE was
   successfully loaded (on core 0) and transfers control to the same TEE
   entry point.

The code at TEE entry point is expected perform OS initialization steps
and return back to non-secure world (U-Boot).

Signed-off-by: Harinarayan Bhatta <harinarayan@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-12-03 13:21:21 -05:00

234 lines
6.9 KiB
C

/*
*
* Security related functions for OMAP5 class devices
*
* (C) Copyright 2016
* Texas Instruments, <www.ti.com>
*
* Daniel Allred <d-allred@ti.com>
* Harinarayan Bhatta <harinarayan@ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <stdarg.h>
#include <asm/arch/sys_proto.h>
#include <asm/omap_common.h>
#include <asm/omap_sec_common.h>
#include <asm/spl.h>
#include <spl.h>
#include <asm/cache.h>
#include <mapmem.h>
#include <tee/optee.h>
/* Index for signature PPA-based TI HAL APIs */
#define PPA_HAL_SERVICES_START_INDEX (0x200)
#define PPA_SERV_HAL_TEE_LOAD_MASTER (PPA_HAL_SERVICES_START_INDEX + 23)
#define PPA_SERV_HAL_TEE_LOAD_SLAVE (PPA_HAL_SERVICES_START_INDEX + 24)
#define PPA_SERV_HAL_SETUP_SEC_RESVD_REGION (PPA_HAL_SERVICES_START_INDEX + 25)
#define PPA_SERV_HAL_SETUP_EMIF_FW_REGION (PPA_HAL_SERVICES_START_INDEX + 26)
#define PPA_SERV_HAL_LOCK_EMIF_FW (PPA_HAL_SERVICES_START_INDEX + 27)
int tee_loaded = 0;
/* Argument for PPA_SERV_HAL_TEE_LOAD_MASTER */
struct ppa_tee_load_info {
u32 tee_sec_mem_start; /* Physical start address reserved for TEE */
u32 tee_sec_mem_size; /* Size of the memory reserved for TEE */
u32 tee_cert_start; /* Address where signed TEE binary is loaded */
u32 tee_cert_size; /* Size of TEE certificate (signed binary) */
u32 tee_jump_addr; /* Address to jump to start TEE execution */
u32 tee_arg0; /* argument to TEE jump function, in r0 */
};
static u32 get_sec_mem_start(void)
{
u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START;
u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE;
/*
* Total reserved region is all contiguous with protected
* region coming first, followed by the non-secure region.
* If 0x0 start address is given, we simply put the reserved
* region at the end of the external DRAM.
*/
if (sec_mem_start == 0)
sec_mem_start =
(CONFIG_SYS_SDRAM_BASE +
(omap_sdram_size() - sec_mem_size));
return sec_mem_start;
}
int secure_emif_firewall_setup(uint8_t region_num, uint32_t start_addr,
uint32_t size, uint32_t access_perm,
uint32_t initiator_perm)
{
int result = 1;
/*
* Call PPA HAL API to do any other general firewall
* configuration for regions 1-6 of the EMIF firewall.
*/
debug("%s: regionNum = %x, startAddr = %x, size = %x", __func__,
region_num, start_addr, size);
result = secure_rom_call(
PPA_SERV_HAL_SETUP_EMIF_FW_REGION, 0, 0, 4,
(start_addr & 0xFFFFFFF0) | (region_num & 0x0F),
size, access_perm, initiator_perm);
if (result != 0) {
puts("Secure EMIF Firewall Setup failed!\n");
debug("Return Value = %x\n", result);
}
return result;
}
#if (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE < \
CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE)
#error "TI Secure EMIF: Protected size cannot be larger than total size."
#endif
int secure_emif_reserve(void)
{
int result = 1;
u32 sec_mem_start = get_sec_mem_start();
u32 sec_prot_size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
/* If there is no protected region, there is no reservation to make */
if (sec_prot_size == 0)
return 0;
/*
* Call PPA HAL API to reserve a chunk of EMIF SDRAM
* for secure world use. This region should be carved out
* from use by any public code. EMIF firewall region 7
* will be used to protect this block of memory.
*/
result = secure_rom_call(
PPA_SERV_HAL_SETUP_SEC_RESVD_REGION,
0, 0, 2, sec_mem_start, sec_prot_size);
if (result != 0) {
puts("SDRAM Firewall: Secure memory reservation failed!\n");
debug("Return Value = %x\n", result);
}
return result;
}
int secure_emif_firewall_lock(void)
{
int result = 1;
/*
* Call PPA HAL API to lock the EMIF firewall configurations.
* After this API is called, none of the PPA HAL APIs for
* configuring the EMIF firewalls will be usable again (that
* is, calls to those APIs will return failure and have no
* effect).
*/
result = secure_rom_call(
PPA_SERV_HAL_LOCK_EMIF_FW,
0, 0, 0);
if (result != 0) {
puts("Secure EMIF Firewall Lock failed!\n");
debug("Return Value = %x\n", result);
}
return result;
}
static struct ppa_tee_load_info tee_info __aligned(ARCH_DMA_MINALIGN);
int secure_tee_install(u32 addr)
{
struct optee_header *hdr;
void *loadptr;
u32 tee_file_size;
u32 sec_mem_start = get_sec_mem_start();
const u32 size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
u32 *smc_cpu1_params;
u32 ret;
/* If there is no protected region, there is no place to put the TEE */
if (size == 0) {
printf("Error loading TEE, no protected memory region available\n");
return -ENOBUFS;
}
hdr = (struct optee_header *)map_sysmem(addr, sizeof(struct optee_header));
/* 280 bytes = size of signature */
tee_file_size = hdr->init_size + hdr->paged_size +
sizeof(struct optee_header) + 280;
if ((hdr->magic != OPTEE_MAGIC) ||
(hdr->version != OPTEE_VERSION) ||
(hdr->init_load_addr_hi != 0) ||
(hdr->init_load_addr_lo < (sec_mem_start + sizeof(struct optee_header))) ||
(tee_file_size > size) ||
((hdr->init_load_addr_lo + tee_file_size - 1) >
(sec_mem_start + size - 1))) {
printf("Error in TEE header. Check load address and sizes\n");
unmap_sysmem(hdr);
return CMD_RET_FAILURE;
}
tee_info.tee_sec_mem_start = sec_mem_start;
tee_info.tee_sec_mem_size = size;
tee_info.tee_jump_addr = hdr->init_load_addr_lo;
tee_info.tee_cert_start = addr;
tee_info.tee_cert_size = tee_file_size;
tee_info.tee_arg0 = hdr->init_size + tee_info.tee_jump_addr;
unmap_sysmem(hdr);
loadptr = map_sysmem(addr, tee_file_size);
debug("tee_info.tee_sec_mem_start= %08X\n", tee_info.tee_sec_mem_start);
debug("tee_info.tee_sec_mem_size = %08X\n", tee_info.tee_sec_mem_size);
debug("tee_info.tee_jump_addr = %08X\n", tee_info.tee_jump_addr);
debug("tee_info.tee_cert_start = %08X\n", tee_info.tee_cert_start);
debug("tee_info.tee_cert_size = %08X\n", tee_info.tee_cert_size);
debug("tee_info.tee_arg0 = %08X\n", tee_info.tee_arg0);
debug("tee_file_size = %d\n", tee_file_size);
#if !defined(CONFIG_SYS_DCACHE_OFF)
flush_dcache_range(
rounddown((u32)loadptr, ARCH_DMA_MINALIGN),
roundup((u32)loadptr + tee_file_size, ARCH_DMA_MINALIGN));
flush_dcache_range((u32)&tee_info, (u32)&tee_info +
roundup(sizeof(tee_info), ARCH_DMA_MINALIGN));
#endif
unmap_sysmem(loadptr);
ret = secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info);
if (ret) {
printf("TEE_LOAD_MASTER Failed\n");
return ret;
}
printf("TEE_LOAD_MASTER Done\n");
if (!is_dra72x()) {
/* Reuse the tee_info buffer for SMC params */
smc_cpu1_params = (u32 *)&tee_info;
smc_cpu1_params[0] = 0;
#if !defined(CONFIG_SYS_DCACHE_OFF)
flush_dcache_range((u32)smc_cpu1_params, (u32)smc_cpu1_params +
roundup(sizeof(u32), ARCH_DMA_MINALIGN));
#endif
ret = omap_smc_sec_cpu1(PPA_SERV_HAL_TEE_LOAD_SLAVE, 0, 0,
smc_cpu1_params);
if (ret) {
printf("TEE_LOAD_SLAVE Failed\n");
return ret;
}
printf("TEE_LOAD_SLAVE Done\n");
}
tee_loaded = 1;
return 0;
}