diff options
Diffstat (limited to 'target/nios2/cpu.c')
| -rw-r--r-- | target/nios2/cpu.c | 410 |
1 files changed, 0 insertions, 410 deletions
diff --git a/target/nios2/cpu.c b/target/nios2/cpu.c deleted file mode 100644 index 679aff5730..0000000000 --- a/target/nios2/cpu.c +++ /dev/null @@ -1,410 +0,0 @@ -/* - * QEMU Nios II CPU - * - * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see - * <http://www.gnu.org/licenses/lgpl-2.1.html> - */ - -#include "qemu/osdep.h" -#include "qemu/module.h" -#include "qapi/error.h" -#include "cpu.h" -#include "exec/log.h" -#include "gdbstub/helpers.h" -#include "hw/qdev-properties.h" - -static void nios2_cpu_set_pc(CPUState *cs, vaddr value) -{ - cpu_env(cs)->pc = value; -} - -static vaddr nios2_cpu_get_pc(CPUState *cs) -{ - return cpu_env(cs)->pc; -} - -static void nios2_restore_state_to_opc(CPUState *cs, - const TranslationBlock *tb, - const uint64_t *data) -{ - cpu_env(cs)->pc = data[0]; -} - -static bool nios2_cpu_has_work(CPUState *cs) -{ - return cs->interrupt_request & CPU_INTERRUPT_HARD; -} - -static int nios2_cpu_mmu_index(CPUState *cs, bool ifetch) -{ - return (cpu_env(cs)->ctrl[CR_STATUS] & CR_STATUS_U - ? MMU_USER_IDX : MMU_SUPERVISOR_IDX); -} - -static void nios2_cpu_reset_hold(Object *obj) -{ - CPUState *cs = CPU(obj); - Nios2CPU *cpu = NIOS2_CPU(cs); - Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(obj); - CPUNios2State *env = &cpu->env; - - if (ncc->parent_phases.hold) { - ncc->parent_phases.hold(obj); - } - - memset(env->ctrl, 0, sizeof(env->ctrl)); - env->pc = cpu->reset_addr; - -#if defined(CONFIG_USER_ONLY) - /* Start in user mode with interrupts enabled. */ - env->ctrl[CR_STATUS] = CR_STATUS_RSIE | CR_STATUS_U | CR_STATUS_PIE; - memset(env->regs, 0, sizeof(env->regs)); -#else - env->ctrl[CR_STATUS] = CR_STATUS_RSIE; - nios2_update_crs(env); - memset(env->shadow_regs, 0, sizeof(env->shadow_regs)); -#endif -} - -#ifndef CONFIG_USER_ONLY -static void eic_set_irq(void *opaque, int irq, int level) -{ - Nios2CPU *cpu = opaque; - CPUState *cs = CPU(cpu); - - if (level) { - cpu_interrupt(cs, CPU_INTERRUPT_HARD); - } else { - cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); - } -} - -static void iic_set_irq(void *opaque, int irq, int level) -{ - Nios2CPU *cpu = opaque; - CPUNios2State *env = &cpu->env; - CPUState *cs = CPU(cpu); - - env->ctrl[CR_IPENDING] = deposit32(env->ctrl[CR_IPENDING], irq, 1, !!level); - - if (env->ctrl[CR_IPENDING]) { - cpu_interrupt(cs, CPU_INTERRUPT_HARD); - } else { - cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); - } -} -#endif - -static void nios2_cpu_initfn(Object *obj) -{ -#if !defined(CONFIG_USER_ONLY) - Nios2CPU *cpu = NIOS2_CPU(obj); - - mmu_init(&cpu->env); -#endif -} - -static ObjectClass *nios2_cpu_class_by_name(const char *cpu_model) -{ - return object_class_by_name(TYPE_NIOS2_CPU); -} - -static void realize_cr_status(CPUState *cs) -{ - Nios2CPU *cpu = NIOS2_CPU(cs); - - /* Begin with all fields of all registers are reserved. */ - memset(cpu->cr_state, 0, sizeof(cpu->cr_state)); - - /* - * The combination of writable and readonly is the set of all - * non-reserved fields. We apply writable as a mask to bits, - * and merge in existing readonly bits, before storing. - */ -#define WR_REG(C) cpu->cr_state[C].writable = -1 -#define RO_REG(C) cpu->cr_state[C].readonly = -1 -#define WR_FIELD(C, F) cpu->cr_state[C].writable |= R_##C##_##F##_MASK -#define RO_FIELD(C, F) cpu->cr_state[C].readonly |= R_##C##_##F##_MASK - - WR_FIELD(CR_STATUS, PIE); - WR_REG(CR_ESTATUS); - WR_REG(CR_BSTATUS); - RO_REG(CR_CPUID); - RO_REG(CR_EXCEPTION); - WR_REG(CR_BADADDR); - - if (cpu->eic_present) { - WR_FIELD(CR_STATUS, RSIE); - RO_FIELD(CR_STATUS, NMI); - WR_FIELD(CR_STATUS, PRS); - RO_FIELD(CR_STATUS, CRS); - WR_FIELD(CR_STATUS, IL); - WR_FIELD(CR_STATUS, IH); - } else { - RO_FIELD(CR_STATUS, RSIE); - WR_REG(CR_IENABLE); - RO_REG(CR_IPENDING); - } - - if (cpu->mmu_present) { - WR_FIELD(CR_STATUS, U); - WR_FIELD(CR_STATUS, EH); - - WR_FIELD(CR_PTEADDR, VPN); - WR_FIELD(CR_PTEADDR, PTBASE); - - RO_FIELD(CR_TLBMISC, D); - RO_FIELD(CR_TLBMISC, PERM); - RO_FIELD(CR_TLBMISC, BAD); - RO_FIELD(CR_TLBMISC, DBL); - WR_FIELD(CR_TLBMISC, PID); - WR_FIELD(CR_TLBMISC, WE); - WR_FIELD(CR_TLBMISC, RD); - WR_FIELD(CR_TLBMISC, WAY); - - WR_REG(CR_TLBACC); - } - - /* - * TODO: ECC (config, eccinj) and MPU (config, mpubase, mpuacc) are - * unimplemented, so their corresponding control regs remain reserved. - */ - -#undef WR_REG -#undef RO_REG -#undef WR_FIELD -#undef RO_FIELD -} - -static void nios2_cpu_realizefn(DeviceState *dev, Error **errp) -{ - CPUState *cs = CPU(dev); - Nios2CPU *cpu = NIOS2_CPU(cs); - Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(dev); - Error *local_err = NULL; - - cpu_exec_realizefn(cs, &local_err); - if (local_err != NULL) { - error_propagate(errp, local_err); - return; - } - - realize_cr_status(cs); - qemu_init_vcpu(cs); - cpu_reset(cs); - - /* We have reserved storage for cpuid; might as well use it. */ - cpu->env.ctrl[CR_CPUID] = cs->cpu_index; - -#ifndef CONFIG_USER_ONLY - if (cpu->eic_present) { - qdev_init_gpio_in_named(DEVICE(cpu), eic_set_irq, "EIC", 1); - } else { - qdev_init_gpio_in_named(DEVICE(cpu), iic_set_irq, "IRQ", 32); - } -#endif - - ncc->parent_realize(dev, errp); -} - -#ifndef CONFIG_USER_ONLY -static bool eic_take_interrupt(Nios2CPU *cpu) -{ - CPUNios2State *env = &cpu->env; - const uint32_t status = env->ctrl[CR_STATUS]; - - if (cpu->rnmi) { - return !(status & CR_STATUS_NMI); - } - if (!(status & CR_STATUS_PIE)) { - return false; - } - if (cpu->ril <= FIELD_EX32(status, CR_STATUS, IL)) { - return false; - } - if (cpu->rrs != FIELD_EX32(status, CR_STATUS, CRS)) { - return true; - } - return status & CR_STATUS_RSIE; -} - -static bool iic_take_interrupt(Nios2CPU *cpu) -{ - CPUNios2State *env = &cpu->env; - - if (!(env->ctrl[CR_STATUS] & CR_STATUS_PIE)) { - return false; - } - return env->ctrl[CR_IPENDING] & env->ctrl[CR_IENABLE]; -} - -static bool nios2_cpu_exec_interrupt(CPUState *cs, int interrupt_request) -{ - Nios2CPU *cpu = NIOS2_CPU(cs); - - if (interrupt_request & CPU_INTERRUPT_HARD) { - if (cpu->eic_present - ? eic_take_interrupt(cpu) - : iic_take_interrupt(cpu)) { - cs->exception_index = EXCP_IRQ; - nios2_cpu_do_interrupt(cs); - return true; - } - } - return false; -} -#endif /* !CONFIG_USER_ONLY */ - -static void nios2_cpu_disas_set_info(CPUState *cpu, disassemble_info *info) -{ - /* NOTE: NiosII R2 is not supported yet. */ - info->mach = bfd_arch_nios2; - info->print_insn = print_insn_nios2; -} - -static int nios2_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n) -{ - Nios2CPU *cpu = NIOS2_CPU(cs); - CPUNios2State *env = &cpu->env; - uint32_t val; - - if (n < 32) { /* GP regs */ - val = env->regs[n]; - } else if (n == 32) { /* PC */ - val = env->pc; - } else if (n < 49) { /* Status regs */ - unsigned cr = n - 33; - if (nios2_cr_reserved(&cpu->cr_state[cr])) { - val = 0; - } else { - val = env->ctrl[n - 33]; - } - } else { - /* Invalid regs */ - return 0; - } - - return gdb_get_reg32(mem_buf, val); -} - -static int nios2_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) -{ - Nios2CPU *cpu = NIOS2_CPU(cs); - CPUClass *cc = CPU_GET_CLASS(cs); - CPUNios2State *env = &cpu->env; - uint32_t val; - - if (n > cc->gdb_num_core_regs) { - return 0; - } - val = ldl_p(mem_buf); - - if (n < 32) { /* GP regs */ - env->regs[n] = val; - } else if (n == 32) { /* PC */ - env->pc = val; - } else if (n < 49) { /* Status regs */ - unsigned cr = n - 33; - /* ??? Maybe allow the debugger to write to readonly fields. */ - val &= cpu->cr_state[cr].writable; - val |= cpu->cr_state[cr].readonly & env->ctrl[cr]; - env->ctrl[cr] = val; - } else { - g_assert_not_reached(); - } - - return 4; -} - -static Property nios2_properties[] = { - DEFINE_PROP_BOOL("diverr_present", Nios2CPU, diverr_present, true), - DEFINE_PROP_BOOL("mmu_present", Nios2CPU, mmu_present, true), - /* ALTR,pid-num-bits */ - DEFINE_PROP_UINT32("mmu_pid_num_bits", Nios2CPU, pid_num_bits, 8), - /* ALTR,tlb-num-ways */ - DEFINE_PROP_UINT32("mmu_tlb_num_ways", Nios2CPU, tlb_num_ways, 16), - /* ALTR,tlb-num-entries */ - DEFINE_PROP_UINT32("mmu_pid_num_entries", Nios2CPU, tlb_num_entries, 256), - DEFINE_PROP_END_OF_LIST(), -}; - -#ifndef CONFIG_USER_ONLY -#include "hw/core/sysemu-cpu-ops.h" - -static const struct SysemuCPUOps nios2_sysemu_ops = { - .get_phys_page_debug = nios2_cpu_get_phys_page_debug, -}; -#endif - -#include "hw/core/tcg-cpu-ops.h" - -static const TCGCPUOps nios2_tcg_ops = { - .initialize = nios2_tcg_init, - .restore_state_to_opc = nios2_restore_state_to_opc, - -#ifndef CONFIG_USER_ONLY - .tlb_fill = nios2_cpu_tlb_fill, - .cpu_exec_interrupt = nios2_cpu_exec_interrupt, - .do_interrupt = nios2_cpu_do_interrupt, - .do_unaligned_access = nios2_cpu_do_unaligned_access, -#endif /* !CONFIG_USER_ONLY */ -}; - -static void nios2_cpu_class_init(ObjectClass *oc, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(oc); - CPUClass *cc = CPU_CLASS(oc); - Nios2CPUClass *ncc = NIOS2_CPU_CLASS(oc); - ResettableClass *rc = RESETTABLE_CLASS(oc); - - device_class_set_parent_realize(dc, nios2_cpu_realizefn, - &ncc->parent_realize); - device_class_set_props(dc, nios2_properties); - resettable_class_set_parent_phases(rc, NULL, nios2_cpu_reset_hold, NULL, - &ncc->parent_phases); - - cc->class_by_name = nios2_cpu_class_by_name; - cc->has_work = nios2_cpu_has_work; - cc->mmu_index = nios2_cpu_mmu_index; - cc->dump_state = nios2_cpu_dump_state; - cc->set_pc = nios2_cpu_set_pc; - cc->get_pc = nios2_cpu_get_pc; - cc->disas_set_info = nios2_cpu_disas_set_info; -#ifndef CONFIG_USER_ONLY - cc->sysemu_ops = &nios2_sysemu_ops; -#endif - cc->gdb_read_register = nios2_cpu_gdb_read_register; - cc->gdb_write_register = nios2_cpu_gdb_write_register; - cc->gdb_num_core_regs = 49; - cc->tcg_ops = &nios2_tcg_ops; -} - -static const TypeInfo nios2_cpu_type_info = { - .name = TYPE_NIOS2_CPU, - .parent = TYPE_CPU, - .instance_size = sizeof(Nios2CPU), - .instance_align = __alignof(Nios2CPU), - .instance_init = nios2_cpu_initfn, - .class_size = sizeof(Nios2CPUClass), - .class_init = nios2_cpu_class_init, -}; - -static void nios2_cpu_register_types(void) -{ - type_register_static(&nios2_cpu_type_info); -} - -type_init(nios2_cpu_register_types) |