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exosphere: Implement smc_ams_iram_copy

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This commit is contained in:
Michael Scire 2019-01-20 05:05:24 -08:00
parent eeef08e58e
commit deb124138b
3 changed files with 141 additions and 9 deletions
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10
exosphere/src/memory_map.h
View file

@ -48,7 +48,9 @@
#define _MMAPDEV15 ( 0x6000D000ull, 0x1000ull, true ) /* GPIO-1 - GPIO-8 */
#define _MMAPDEV16 ( 0x7000C000ull, 0x1000ull, true ) /* I2C-I2C4 */
#define _MMAPDEV17 ( 0x6000F000ull, 0x1000ull, true ) /* Exception vectors */
#define _MMAPDEV18 ( 0x40038000ull, 0x8000ull, true ) /* DEBUG: IRAM */
#define _MMAPDEV18 ( 0x00000000ull, 0x1000ull, true ) /* AMS irampage, NOT mapped at startup */
#define _MMAPDEV19 ( 0x00000000ull, 0x1000ull, true ) /* AMS userpage, NOT mapped at startup */
#define _MMAPDEV20 ( 0x40038000ull, 0x5000ull, true ) /* DEBUG: IRAM */
/* LP0 entry ram segments (addr, size, additional attributes) */
#define _MMAPLP0ES0 ( 0x40020000ull, 0x10000ull, MMU_PTE_BLOCK_NS | ATTRIB_MEMTYPE_DEVICE ) /* Encrypted TZRAM */
@ -108,8 +110,10 @@
#define MMIO_DEVID_GPIO 15
#define MMIO_DEVID_DTV_I2C234 16
#define MMIO_DEVID_EXCEPTION_VECTORS 17
#define MMIO_DEVID_DEBUG_IRAM 18
#define MMIO_DEVID_MAX 19
#define MMIO_DEVID_AMS_IRAM_PAGE 18
#define MMIO_DEVID_AMS_USER_PAGE 19
#define MMIO_DEVID_DEBUG_IRAM 20
#define MMIO_DEVID_MAX 21
#define LP0_ENTRY_RAM_SEGMENT_ID_ENCRYPTED_TZRAM 0
#define LP0_ENTRY_RAM_SEGMENT_ID_LP0_ENTRY_CODE 1

4
exosphere/src/mmu.h
View file

@ -165,6 +165,10 @@ static inline void mmu_unmap(unsigned int level, uintptr_t *tbl, uintptr_t base_
tbl[mmu_compute_index(level, base_addr)] = MMU_PTE_TYPE_FAULT;
}
static inline void mmu_unmap_page(uintptr_t *tbl, uintptr_t base_addr) {
tbl[mmu_compute_index(3, base_addr)] = MMU_PTE_TYPE_FAULT;
}
static inline void mmu_map_block_range(unsigned int level, uintptr_t *tbl, uintptr_t base_addr, uintptr_t phys_addr, size_t size, uint64_t attrs) {
size = ((size + (BITL(MMU_Lx_SHIFT(level)) - 1)) >> MMU_Lx_SHIFT(level)) << MMU_Lx_SHIFT(level);
for(size_t offset = 0; offset < size; offset += BITL(MMU_Lx_SHIFT(level))) {

136
exosphere/src/smc_ams.c
View file

@ -14,20 +14,144 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdatomic.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "utils.h"
#include "smc_api.h"
#include "smc_ams.h"
#include "arm.h"
#include "synchronization.h"
#include "memory_map.h"
#include "mmu.h"
static atomic_flag g_ams_userpage_mapped = ATOMIC_FLAG_INIT;
static atomic_flag g_ams_iram_page_mapped = ATOMIC_FLAG_INIT;
static inline uintptr_t get_ams_user_page_secure_monitor_addr(void) {
return MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_AMS_USER_PAGE);
}
static inline uintptr_t get_ams_iram_page_secure_monitor_addr(void) {
return MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_AMS_IRAM_PAGE);
}
#define AMS_USER_PAGE_SECURE_MONITOR_ADDR (get_ams_user_page_secure_monitor_addr())
#define AMS_IRAM_PAGE_SECURE_MONITOR_ADDR (get_ams_iram_page_secure_monitor_addr())
static inline uintptr_t get_page_for_address(void *address) {
return ((uintptr_t)(address)) & ~0xFFFULL;
}
static bool ams_is_user_addr_valid(uintptr_t user_address) {
/* Check that the address is in dram. */
uintptr_t page_address = get_page_for_address((void *)user_address);
return (page_address - 0x80000000ull) < (6ull << 30);
}
static bool ams_is_iram_addr_valid(uintptr_t iram_address) {
/* Check that the address is in iram. */
return 0x40000000ULL <= iram_address && iram_address <= 0x4003FFFFULL;
}
static void ams_map_userpage(uintptr_t user_address) {
lock_acquire(&g_ams_userpage_mapped);
static const uint64_t userpage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | MMU_PTE_BLOCK_NS | ATTRIB_MEMTYPE_NORMAL;
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
mmu_map_page(mmu_l3_tbl, AMS_USER_PAGE_SECURE_MONITOR_ADDR, get_page_for_address((void *)user_address), userpage_attributes);
tlb_invalidate_page_inner_shareable((void *)AMS_USER_PAGE_SECURE_MONITOR_ADDR);
}
static void ams_unmap_userpage(void) {
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
mmu_unmap_page(mmu_l3_tbl, AMS_USER_PAGE_SECURE_MONITOR_ADDR);
tlb_invalidate_page_inner_shareable((void *)AMS_USER_PAGE_SECURE_MONITOR_ADDR);
lock_release(&g_ams_userpage_mapped);
}
static void ams_map_irampage(uintptr_t iram_address) {
lock_acquire(&g_ams_iram_page_mapped);
static const uint64_t irampage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | ATTRIB_MEMTYPE_DEVICE;
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
mmu_map_page(mmu_l3_tbl, AMS_IRAM_PAGE_SECURE_MONITOR_ADDR, get_page_for_address((void *)iram_address), irampage_attributes);
tlb_invalidate_page_inner_shareable((void *)AMS_IRAM_PAGE_SECURE_MONITOR_ADDR);
}
static void ams_unmap_irampage(void) {
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
mmu_unmap_page(mmu_l3_tbl, AMS_IRAM_PAGE_SECURE_MONITOR_ADDR);
tlb_invalidate_page_inner_shareable((void *)AMS_IRAM_PAGE_SECURE_MONITOR_ADDR);
lock_release(&g_ams_iram_page_mapped);
}
uint32_t ams_iram_copy(smc_args_t *args) {
/* TODO: Implement a DRAM <-> IRAM copy of up to one page here. */
/* Implements a DRAM <-> IRAM copy of up to one page. */
/* This operation is necessary to implement reboot-to-payload. */
/* args->X[1] = DRAM address (translated by kernel). */
/* args->X[2] = IRAM address. */
/* args->X[3] = size (must be <= 0x1000). */
/* args->X[1] = DRAM address (translated by kernel), must be 4-byte aligned. */
/* args->X[2] = IRAM address, must be 4-byte aligned. */
/* args->X[3] = size (must be <= 0x1000 and 4-byte aligned). */
/* args->X[4] = 0 for read, 1 for write. */
return 2;
const uintptr_t dram_address = (uintptr_t)args->X[1];
const uintptr_t iram_address = (uintptr_t)args->X[2];
const uintptr_t dram_page_offset = (dram_address & 0xFFFULL);
const uintptr_t iram_page_offset = (iram_address & 0xFFFULL);
const size_t size = args->X[3];
const uint32_t option = (uint32_t)args->X[4];
/* Validate addresses. */
if (!ams_is_user_addr_valid(dram_address) || !ams_is_iram_addr_valid(iram_address)) {
return 2;
}
/* Validate size. */
if (size > 0x1000 || (size + dram_page_offset) > 0x1000 || (size + iram_page_offset) > 0x1000) {
return 2;
}
/* Validate alignment. */
if (size % sizeof(uint32_t) || dram_page_offset % sizeof(uint32_t) || iram_page_offset % sizeof(uint32_t)) {
return 2;
}
/* Validate argument. */
if (option != 0 && option != 1) {
return 2;
}
/* Map pages. */
ams_map_userpage(dram_address);
ams_map_irampage(iram_address);
/* Set source/destination for copy. */
volatile uint32_t *dram_ptr = (volatile uint32_t *)(AMS_USER_PAGE_SECURE_MONITOR_ADDR + dram_page_offset);
volatile uint32_t *iram_ptr = (volatile uint32_t *)(AMS_IRAM_PAGE_SECURE_MONITOR_ADDR + iram_page_offset);
volatile uint32_t *dst;
volatile uint32_t *src;
const size_t num_dwords = size / sizeof(uint32_t);
if (option == 0) {
dst = dram_ptr;
src = iram_ptr;
} else {
dst = iram_ptr;
src = dram_ptr;
}
/* Actually copy data. */
for (size_t i = 0; i < num_dwords; i++) {
dst[i] = src[i];
}
/* Flush! */
flush_dcache_range((void *)dst, (void *)(dst + num_dwords));
/* Unmap pages. */
ams_unmap_irampage();
ams_unmap_userpage();
return 0;
}