+/* read config to config3 cp0 registers and log isa implementation */
+int mips32_read_config_regs(struct target *target)
+{
+ struct mips32_common *mips32 = target_to_mips32(target);
+ struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
+
+ if (ejtag_info->config_regs == 0)
+ for (int i = 0; i != 4; i++) {
+ int retval = mips32_cp0_read(ejtag_info, &ejtag_info->config[i], 16, i);
+ if (retval != ERROR_OK) {
+ LOG_ERROR("isa info not available, failed to read cp0 config register: %" PRId32, i);
+ ejtag_info->config_regs = 0;
+ return retval;
+ }
+ ejtag_info->config_regs = i + 1;
+ if ((ejtag_info->config[i] & (1 << 31)) == 0)
+ break; /* no more config registers implemented */
+ }
+ else
+ return ERROR_OK; /* already succesfully read */
+
+ LOG_DEBUG("read %"PRId32" config registers", ejtag_info->config_regs);
+
+ if (ejtag_info->impcode & EJTAG_IMP_MIPS16) {
+ mips32->isa_imp = MIPS32_MIPS16;
+ LOG_USER("MIPS32 with MIPS16 support implemented");
+
+ } else if (ejtag_info->config_regs >= 4) { /* config3 implemented */
+ unsigned isa_imp = (ejtag_info->config[3] & MIPS32_CONFIG3_ISA_MASK) >> MIPS32_CONFIG3_ISA_SHIFT;
+ if (isa_imp == 1) {
+ mips32->isa_imp = MMIPS32_ONLY;
+ LOG_USER("MICRO MIPS32 only implemented");
+
+ } else if (isa_imp != 0) {
+ mips32->isa_imp = MIPS32_MMIPS32;
+ LOG_USER("MIPS32 and MICRO MIPS32 implemented");
+ }
+ }
+
+ if (mips32->isa_imp == MIPS32_ONLY) /* initial default value */
+ LOG_USER("MIPS32 only implemented");
+
+ return ERROR_OK;
+}