The Nios2 architecture supports two different interrupt controller options: * The IIC (Internal Interrupt Controller) is part of the CPU itself; it has 32 IRQ input lines and no NMI support. Interrupt status is queried and controlled via the CPU's ipending and istatus registers. * The EIC (External Interrupt Controller) interface allows the CPU to connect to an external interrupt controller. The interface allows the interrupt controller to present a packet of information containing: - handler address - interrupt level - register set - NMI mode QEMU does not model an EIC currently. We do model the IIC, but its implementation is split across code in hw/nios2/cpu_pic.c and hw/intc/nios2_iic.c. The code in those two files has no state of its own -- the IIC state is in the Nios2CPU state struct. Because CPU objects now inherit (indirectly) from TYPE_DEVICE, they can have GPIO input lines themselves, so we can implement the IIC directly in the CPU object the same way that real hardware does. Create named "IRQ" GPIO inputs to the Nios2 CPU object, and make the only user of the IIC wire up directly to those instead. Note that the old code had an "NMI" concept which was entirely unused and also as far as I can see not architecturally correct, since only the EIC has a concept of an NMI. This fixes a Coverity-reported trivial memory leak of the IRQ array allocated in nios2_cpu_pic_init(). Fixes: Coverity CID 1421916 Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20201129174022.26530-2-peter.maydell@linaro.org Reviewed-by: Wentong Wu <wentong.wu@intel.com> Tested-by: Wentong Wu <wentong.wu@intel.com>
256 lines
7.2 KiB
C
256 lines
7.2 KiB
C
/*
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* QEMU Nios II CPU
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*
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* Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see
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* <http://www.gnu.org/licenses/lgpl-2.1.html>
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*/
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#include "qemu/osdep.h"
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#include "qemu/module.h"
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#include "qapi/error.h"
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#include "cpu.h"
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#include "exec/log.h"
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#include "exec/gdbstub.h"
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#include "hw/qdev-properties.h"
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static void nios2_cpu_set_pc(CPUState *cs, vaddr value)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUNios2State *env = &cpu->env;
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env->regs[R_PC] = value;
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}
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static bool nios2_cpu_has_work(CPUState *cs)
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{
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return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
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}
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static void nios2_cpu_reset(DeviceState *dev)
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{
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CPUState *cs = CPU(dev);
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Nios2CPU *cpu = NIOS2_CPU(cs);
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Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(cpu);
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CPUNios2State *env = &cpu->env;
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if (qemu_loglevel_mask(CPU_LOG_RESET)) {
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qemu_log("CPU Reset (CPU %d)\n", cs->cpu_index);
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log_cpu_state(cs, 0);
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}
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ncc->parent_reset(dev);
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memset(env->regs, 0, sizeof(uint32_t) * NUM_CORE_REGS);
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env->regs[R_PC] = cpu->reset_addr;
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#if defined(CONFIG_USER_ONLY)
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/* Start in user mode with interrupts enabled. */
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env->regs[CR_STATUS] = CR_STATUS_U | CR_STATUS_PIE;
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#else
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env->regs[CR_STATUS] = 0;
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#endif
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}
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#ifndef CONFIG_USER_ONLY
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static void nios2_cpu_set_irq(void *opaque, int irq, int level)
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{
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Nios2CPU *cpu = opaque;
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CPUNios2State *env = &cpu->env;
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CPUState *cs = CPU(cpu);
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env->regs[CR_IPENDING] &= ~(1 << irq);
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env->regs[CR_IPENDING] |= !!level << irq;
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env->irq_pending = env->regs[CR_IPENDING] & env->regs[CR_IENABLE];
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if (env->irq_pending && (env->regs[CR_STATUS] & CR_STATUS_PIE)) {
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env->irq_pending = 0;
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cpu_interrupt(cs, CPU_INTERRUPT_HARD);
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} else if (!env->irq_pending) {
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cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
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}
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}
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#endif
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static void nios2_cpu_initfn(Object *obj)
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{
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Nios2CPU *cpu = NIOS2_CPU(obj);
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cpu_set_cpustate_pointers(cpu);
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#if !defined(CONFIG_USER_ONLY)
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mmu_init(&cpu->env);
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/*
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* These interrupt lines model the IIC (internal interrupt
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* controller). QEMU does not currently support the EIC
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* (external interrupt controller) -- if we did it would be
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* a separate device in hw/intc with a custom interface to
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* the CPU, and boards using it would not wire up these IRQ lines.
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*/
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qdev_init_gpio_in_named(DEVICE(cpu), nios2_cpu_set_irq, "IRQ", 32);
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#endif
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}
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static ObjectClass *nios2_cpu_class_by_name(const char *cpu_model)
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{
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return object_class_by_name(TYPE_NIOS2_CPU);
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}
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static void nios2_cpu_realizefn(DeviceState *dev, Error **errp)
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{
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CPUState *cs = CPU(dev);
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Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(dev);
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Error *local_err = NULL;
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cpu_exec_realizefn(cs, &local_err);
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if (local_err != NULL) {
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error_propagate(errp, local_err);
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return;
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}
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qemu_init_vcpu(cs);
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cpu_reset(cs);
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ncc->parent_realize(dev, errp);
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}
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static bool nios2_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUNios2State *env = &cpu->env;
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if ((interrupt_request & CPU_INTERRUPT_HARD) &&
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(env->regs[CR_STATUS] & CR_STATUS_PIE)) {
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cs->exception_index = EXCP_IRQ;
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nios2_cpu_do_interrupt(cs);
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return true;
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}
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return false;
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}
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static void nios2_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
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{
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/* NOTE: NiosII R2 is not supported yet. */
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info->mach = bfd_arch_nios2;
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#ifdef TARGET_WORDS_BIGENDIAN
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info->print_insn = print_insn_big_nios2;
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#else
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info->print_insn = print_insn_little_nios2;
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#endif
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}
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static int nios2_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUClass *cc = CPU_GET_CLASS(cs);
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CPUNios2State *env = &cpu->env;
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if (n > cc->gdb_num_core_regs) {
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return 0;
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}
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if (n < 32) { /* GP regs */
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return gdb_get_reg32(mem_buf, env->regs[n]);
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} else if (n == 32) { /* PC */
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return gdb_get_reg32(mem_buf, env->regs[R_PC]);
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} else if (n < 49) { /* Status regs */
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return gdb_get_reg32(mem_buf, env->regs[n - 1]);
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}
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/* Invalid regs */
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return 0;
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}
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static int nios2_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUClass *cc = CPU_GET_CLASS(cs);
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CPUNios2State *env = &cpu->env;
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if (n > cc->gdb_num_core_regs) {
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return 0;
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}
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if (n < 32) { /* GP regs */
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env->regs[n] = ldl_p(mem_buf);
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} else if (n == 32) { /* PC */
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env->regs[R_PC] = ldl_p(mem_buf);
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} else if (n < 49) { /* Status regs */
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env->regs[n - 1] = ldl_p(mem_buf);
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}
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return 4;
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}
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static Property nios2_properties[] = {
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DEFINE_PROP_BOOL("mmu_present", Nios2CPU, mmu_present, true),
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/* ALTR,pid-num-bits */
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DEFINE_PROP_UINT32("mmu_pid_num_bits", Nios2CPU, pid_num_bits, 8),
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/* ALTR,tlb-num-ways */
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DEFINE_PROP_UINT32("mmu_tlb_num_ways", Nios2CPU, tlb_num_ways, 16),
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/* ALTR,tlb-num-entries */
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DEFINE_PROP_UINT32("mmu_pid_num_entries", Nios2CPU, tlb_num_entries, 256),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void nios2_cpu_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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CPUClass *cc = CPU_CLASS(oc);
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Nios2CPUClass *ncc = NIOS2_CPU_CLASS(oc);
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device_class_set_parent_realize(dc, nios2_cpu_realizefn,
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&ncc->parent_realize);
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device_class_set_props(dc, nios2_properties);
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device_class_set_parent_reset(dc, nios2_cpu_reset, &ncc->parent_reset);
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cc->class_by_name = nios2_cpu_class_by_name;
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cc->has_work = nios2_cpu_has_work;
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cc->do_interrupt = nios2_cpu_do_interrupt;
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cc->cpu_exec_interrupt = nios2_cpu_exec_interrupt;
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cc->dump_state = nios2_cpu_dump_state;
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cc->set_pc = nios2_cpu_set_pc;
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cc->disas_set_info = nios2_cpu_disas_set_info;
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cc->tlb_fill = nios2_cpu_tlb_fill;
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#ifndef CONFIG_USER_ONLY
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cc->do_unaligned_access = nios2_cpu_do_unaligned_access;
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cc->get_phys_page_debug = nios2_cpu_get_phys_page_debug;
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#endif
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cc->gdb_read_register = nios2_cpu_gdb_read_register;
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cc->gdb_write_register = nios2_cpu_gdb_write_register;
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cc->gdb_num_core_regs = 49;
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cc->tcg_initialize = nios2_tcg_init;
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}
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static const TypeInfo nios2_cpu_type_info = {
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.name = TYPE_NIOS2_CPU,
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.parent = TYPE_CPU,
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.instance_size = sizeof(Nios2CPU),
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.instance_init = nios2_cpu_initfn,
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.class_size = sizeof(Nios2CPUClass),
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.class_init = nios2_cpu_class_init,
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};
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static void nios2_cpu_register_types(void)
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{
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type_register_static(&nios2_cpu_type_info);
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}
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type_init(nios2_cpu_register_types)
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