-
- /* MRC p15,0,<Rt>,c2,c0,ttb */
- retval = dpm->instr_read_data_r0(dpm,
- ARMV4_5_MRC(15, 0, 0, 2, 0, ttb),
- &ttb);
- if (retval != ERROR_OK)
- return retval;
- retval = armv8->armv8_mmu.read_physical_memory(target,
- (ttb & 0xffffc000) | ((va & 0xfff00000) >> 18),
- 4, 1, (uint8_t *)&first_lvl_descriptor);
- if (retval != ERROR_OK)
- return retval;
- first_lvl_descriptor = target_buffer_get_u32(target, (uint8_t *)
- &first_lvl_descriptor);
- /* reuse armv4_5 piece of code, specific armv8 changes may come later */
- LOG_DEBUG("1st lvl desc: %8.8" PRIx32 "", first_lvl_descriptor);
-
- if ((first_lvl_descriptor & 0x3) == 0) {
- LOG_ERROR("Address translation failure");
- return ERROR_TARGET_TRANSLATION_FAULT;
- }
-
-
- if ((first_lvl_descriptor & 0x3) == 2) {
- /* section descriptor */
- *val = (first_lvl_descriptor & 0xfff00000) | (va & 0x000fffff);
- return ERROR_OK;
- }
-
- if ((first_lvl_descriptor & 0x3) == 1) {
- /* coarse page table */
- retval = armv8->armv8_mmu.read_physical_memory(target,
- (first_lvl_descriptor & 0xfffffc00) | ((va & 0x000ff000) >> 10),
- 4, 1, (uint8_t *)&second_lvl_descriptor);
- if (retval != ERROR_OK)
- return retval;
- } else if ((first_lvl_descriptor & 0x3) == 3) {
- /* fine page table */
- retval = armv8->armv8_mmu.read_physical_memory(target,
- (first_lvl_descriptor & 0xfffff000) | ((va & 0x000ffc00) >> 8),
- 4, 1, (uint8_t *)&second_lvl_descriptor);
- if (retval != ERROR_OK)
- return retval;
- }
-
- second_lvl_descriptor = target_buffer_get_u32(target, (uint8_t *)
- &second_lvl_descriptor);
-
- LOG_DEBUG("2nd lvl desc: %8.8" PRIx32 "", second_lvl_descriptor);
-
- if ((second_lvl_descriptor & 0x3) == 0) {
- LOG_ERROR("Address translation failure");
- return ERROR_TARGET_TRANSLATION_FAULT;
- }
-
- if ((second_lvl_descriptor & 0x3) == 1) {
- /* large page descriptor */
- *val = (second_lvl_descriptor & 0xffff0000) | (va & 0x0000ffff);
- return ERROR_OK;
- }
-
- if ((second_lvl_descriptor & 0x3) == 2) {
- /* small page descriptor */
- *val = (second_lvl_descriptor & 0xfffff000) | (va & 0x00000fff);
- return ERROR_OK;
- }
-
- if ((second_lvl_descriptor & 0x3) == 3) {
- *val = (second_lvl_descriptor & 0xfffffc00) | (va & 0x000003ff);
- return ERROR_OK;
- }
-
- /* should not happen */
- LOG_ERROR("Address translation failure");
- return ERROR_TARGET_TRANSLATION_FAULT;