text: /*
   * QEMU HPPA hardware system emulator.
   * Copyright 2018 Helge Deller <deller@gmx.de>
   */
  
  #include "qemu/osdep.h"
  #include "qemu-common.h"
  #include "cpu.h"
  #include "hw/hw.h"
  #include "elf.h"
  #include "hw/loader.h"
  #include "hw/boards.h"
  #include "qemu/error-report.h"
  #include "sysemu/sysemu.h"
  #include "hw/timer/mc146818rtc.h"
  #include "hw/ide.h"
  #include "hw/timer/i8254.h"
  #include "hw/char/serial.h"
  #include "hppa_sys.h"
  #include "qemu/units.h"
  #include "qapi/error.h"
  #include "qemu/log.h"
  
  #define MAX_IDE_BUS 2
  
  static ISABus *hppa_isa_bus(void)
  {
      ISABus *isa_bus;
      qemu_irq *isa_irqs;
      MemoryRegion *isa_region;
  
      isa_region = g_new(MemoryRegion, 1);
      memory_region_init_io(isa_region, NULL, &hppa_pci_ignore_ops,
                            NULL, "isa-io", 0x800);
      memory_region_add_subregion(get_system_memory(), IDE_HPA,
                                  isa_region);
  
      isa_bus = isa_bus_new(NULL, get_system_memory(), isa_region,
                            &error_abort);
      isa_irqs = i8259_init(isa_bus,
                            /* qemu_allocate_irq(dino_set_isa_irq, s, 0)); */
                            NULL);
      isa_bus_irqs(isa_bus, isa_irqs);
  
      return isa_bus;
  }
  
  static uint64_t cpu_hppa_to_phys(void *opaque, uint64_t addr)
  {
      addr &= (0x10000000 - 1);
      return addr;
  }
  
  static HPPACPU *cpu[HPPA_MAX_CPUS];
  static uint64_t firmware_entry;
  
  static void machine_hppa_init(MachineState *machine)
  {
      const char *kernel_filename = machine->kernel_filename;
      const char *kernel_cmdline = machine->kernel_cmdline;
      const char *initrd_filename = machine->initrd_filename;
      DeviceState *dev;
      PCIBus *pci_bus;
      ISABus *isa_bus;
      qemu_irq rtc_irq, serial_irq;
      char *firmware_filename;
      uint64_t firmware_low, firmware_high;
      long size;
      uint64_t kernel_entry = 0, kernel_low, kernel_high;
      MemoryRegion *addr_space = get_system_memory();
      MemoryRegion *rom_region;
      MemoryRegion *ram_region;
      MemoryRegion *cpu_region;
      long i;
  
      ram_size = machine->ram_size;
  
      /* Create CPUs.  */
      for (i = 0; i < smp_cpus; i++) {
          cpu[i] = HPPA_CPU(cpu_create(machine->cpu_type));
  
          cpu_region = g_new(MemoryRegion, 1);
          memory_region_init_io(cpu_region, OBJECT(cpu[i]), &hppa_io_eir_ops,
                                cpu[i], g_strdup_printf("cpu%ld-io-eir", i), 4);
          memory_region_add_subregion(addr_space, CPU_HPA + i * 0x1000,
                                      cpu_region);
      }
  
      /* Limit main memory. */
      if (ram_size > FIRMWARE_START) {
          machine->ram_size = ram_size = FIRMWARE_START;
      }
  
      /* Main memory region. */
      ram_region = g_new(MemoryRegion, 1);
      memory_region_allocate_system_memory(ram_region, OBJECT(machine),
                                           "ram", ram_size);
      memory_region_add_subregion(addr_space, 0, ram_region);
  
      /* Init Dino (PCI host bus chip).  */
      pci_bus = dino_init(addr_space, &rtc_irq, &serial_irq);
      assert(pci_bus);
  
      /* Create ISA bus. */
      isa_bus = hppa_isa_bus();
      assert(isa_bus);
  
      /* Realtime clock, used by firmware for PDC_TOD call. */
      mc146818_rtc_init(isa_bus, 2000, rtc_irq);
  
      /* Serial code setup.  */
      if (serial_hd(0)) {
          uint32_t addr = DINO_UART_HPA + 0x800;
          serial_mm_init(addr_space, addr, 0, serial_irq,
                         115200, serial_hd(0), DEVICE_BIG_ENDIAN);
      }
  
      /* SCSI disk setup. */
      dev = DEVICE(pci_create_simple(pci_bus, -1, "lsi53c895a"));
      lsi53c8xx_handle_legacy_cmdline(dev);
  
      /* Network setup.  e1000 is good enough, failing Tulip support.  */
      for (i = 0; i < nb_nics; i++) {
          pci_nic_init_nofail(&nd_table[i], pci_bus, "e1000", NULL);
      }
  
      /* Load firmware.  Given that this is not "real" firmware,
         but one explicitly written for the emulation, we might as
         well load it directly from an ELF image.  */
      firmware_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
                                         bios_name ? bios_name :
                                         "hppa-firmware.img");
      if (firmware_filename == NULL) {
          error_report("no firmware provided");
          exit(1);
      }
  
      size = load_elf(firmware_filename, NULL, NULL, NULL,
                      &firmware_entry, &firmware_low, &firmware_high,
                      true, EM_PARISC, 0, 0);
  
      /* Unfortunately, load_elf sign-extends reading elf32.  */
      firmware_entry = (target_ureg)firmware_entry;
      firmware_low = (target_ureg)firmware_low;
      firmware_high = (target_ureg)firmware_high;
  
      if (size < 0) {
          error_report("could not load firmware '%s'", firmware_filename);
          exit(1);
      }
      qemu_log_mask(CPU_LOG_PAGE, "Firmware loaded at 0x%08" PRIx64
                    "-0x%08" PRIx64 ", entry at 0x%08" PRIx64 ".\n",
                    firmware_low, firmware_high, firmware_entry);
      if (firmware_low < ram_size || firmware_high >= FIRMWARE_END) {
          error_report("Firmware overlaps with memory or IO space");
          exit(1);
      }
      g_free(firmware_filename);
  
      rom_region = g_new(MemoryRegion, 1);
      memory_region_allocate_system_memory(rom_region, OBJECT(machine),
                                           "firmware",
                                           (FIRMWARE_END - FIRMWARE_START));
      memory_region_add_subregion(addr_space, FIRMWARE_START, rom_region);
  
      /* Load kernel */
      if (kernel_filename) {
          size = load_elf(kernel_filename, NULL, &cpu_hppa_to_phys,
                          NULL, &kernel_entry, &kernel_low, &kernel_high,
                          true, EM_PARISC, 0, 0);
  
          /* Unfortunately, load_elf sign-extends reading elf32.  */
          kernel_entry = (target_ureg) cpu_hppa_to_phys(NULL, kernel_entry);
          kernel_low = (target_ureg)kernel_low;
          kernel_high = (target_ureg)kernel_high;
  
          if (size < 0) {
              error_report("could not load kernel '%s'", kernel_filename);
              exit(1);
          }
          qemu_log_mask(CPU_LOG_PAGE, "Kernel loaded at 0x%08" PRIx64
                        "-0x%08" PRIx64 ", entry at 0x%08" PRIx64
                        ", size %" PRIu64 " kB\n",
                        kernel_low, kernel_high, kernel_entry, size / KiB);
  
          if (kernel_cmdline) {
              cpu[0]->env.gr[24] = 0x4000;
              pstrcpy_targphys("cmdline", cpu[0]->env.gr[24],
                               TARGET_PAGE_SIZE, kernel_cmdline);
          }
  
          if (initrd_filename) {
              ram_addr_t initrd_base;
              int64_t initrd_size;
  
              initrd_size = get_image_size(initrd_filename);
              if (initrd_size < 0) {
                  error_report("could not load initial ram disk '%s'",
                               initrd_filename);
                  exit(1);
              }
  
              /* Load the initrd image high in memory.
                 Mirror the algorithm used by palo:
                 (1) Due to sign-extension problems and PDC,
                 put the initrd no higher than 1G.
                 (2) Reserve 64k for stack.  */
              initrd_base = MIN(ram_size, 1 * GiB);
              initrd_base = initrd_base - 64 * KiB;
              initrd_base = (initrd_base - initrd_size) & TARGET_PAGE_MASK;
  
              if (initrd_base < kernel_high) {
                  error_report("kernel and initial ram disk too large!");
                  exit(1);
              }
  
              load_image_targphys(initrd_filename, initrd_base, initrd_size);
              cpu[0]->env.gr[23] = initrd_base;
              cpu[0]->env.gr[22] = initrd_base + initrd_size;
          }
      }
  
      if (!kernel_entry) {
          /* When booting via firmware, tell firmware if we want interactive
           * mode (kernel_entry=1), and to boot from CD (gr[24]='d')
           * or hard disc * (gr[24]='c').
           */
          kernel_entry = boot_menu ? 1 : 0;
          cpu[0]->env.gr[24] = machine->boot_order[0];
      }
  
      /* We jump to the firmware entry routine and pass the
       * various parameters in registers. After firmware initialization,
       * firmware will start the Linux kernel with ramdisk and cmdline.
       */
      cpu[0]->env.gr[26] = ram_size;
      cpu[0]->env.gr[25] = kernel_entry;
  
      /* tell firmware how many SMP CPUs to present in inventory table */
      cpu[0]->env.gr[21] = smp_cpus;
  }
  
  static void hppa_machine_reset(void)
  {
      int i;
  
      qemu_devices_reset();
  
      /* Start all CPUs at the firmware entry point.
       *  Monarch CPU will initialize firmware, secondary CPUs
       *  will enter a small idle look and wait for rendevouz. */
      for (i = 0; i < smp_cpus; i++) {
          cpu_set_pc(CPU(cpu[i]), firmware_entry);
          cpu[i]->env.gr[5] = CPU_HPA + i * 0x1000;
      }
  
      /* already initialized by machine_hppa_init()? */
      if (cpu[0]->env.gr[26] == ram_size) {
          return;
      }
  
      cpu[0]->env.gr[26] = ram_size;
      cpu[0]->env.gr[25] = 0; /* no firmware boot menu */
      cpu[0]->env.gr[24] = 'c';
      /* gr22/gr23 unused, no initrd while reboot. */
      cpu[0]->env.gr[21] = smp_cpus;
  }
  
  
  static void machine_hppa_machine_init(MachineClass *mc)
  {
      mc->desc = "HPPA generic machine";
      mc->default_cpu_type = TYPE_HPPA_CPU;
      mc->init = machine_hppa_init;
      mc->reset = hppa_machine_reset;
      mc->block_default_type = IF_SCSI;
      mc->max_cpus = HPPA_MAX_CPUS;
      mc->default_cpus = 1;
      mc->is_default = 1;
      mc->default_ram_size = 512 * MiB;
      mc->default_boot_order = "cd";
  }
  
  DEFINE_MACHINE("hppa", machine_hppa_machine_init)
  