hw/alpha/dp264.c

   1 /*
   2  * QEMU Alpha DP264/CLIPPER hardware system emulator.
   3  *
   4  * Choose CLIPPER IRQ mappings over, say, DP264, MONET, or WEBBRICK
   5  * variants because CLIPPER doesn't have an SMC669 SuperIO controller
   6  * that we need to emulate as well.
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "cpu.h"
  11 #include "elf.h"
  12 #include "hw/loader.h"
  13 #include "alpha_sys.h"
  14 #include "qemu/error-report.h"
  15 #include "hw/rtc/mc146818rtc.h"
  16 #include "hw/ide/pci.h"
  17 #include "hw/isa/superio.h"
  18 #include "net/net.h"
  19 #include "qemu/cutils.h"
  20 #include "qemu/datadir.h"
  21
  22 static uint64_t cpu_alpha_superpage_to_phys(void *opaque, uint64_t addr)
  23 {
  24     if (((addr >> 41) & 3) == 2) {
  25         addr &= 0xffffffffffull;
  26     }
  27     return addr;
  28 }
  29
  30 /* Note that there are at least 3 viewpoints of IRQ numbers on Alpha systems.
  31     (0) The dev_irq_n lines into the cpu, which we totally ignore,
  32     (1) The DRIR lines in the typhoon chipset,
  33     (2) The "vector" aka mangled interrupt number reported by SRM PALcode,
  34     (3) The interrupt number assigned by the kernel.
  35    The following function is concerned with (1) only.  */
  36
  37 static int clipper_pci_map_irq(PCIDevice *d, int irq_num)
  38 {
  39     int slot = d->devfn >> 3;
  40
  41     assert(irq_num >= 0 && irq_num <= 3);
  42
  43     return (slot + 1) * 4 + irq_num;
  44 }
  45
  46 static void clipper_init(MachineState *machine)
  47 {
  48     ram_addr_t ram_size = machine->ram_size;
  49     const char *kernel_filename = machine->kernel_filename;
  50     const char *kernel_cmdline = machine->kernel_cmdline;
  51     const char *initrd_filename = machine->initrd_filename;
  52     MachineClass *mc = MACHINE_GET_CLASS(machine);
  53     AlphaCPU *cpus[4];
  54     PCIBus *pci_bus;
  55     PCIDevice *pci_dev;
  56     DeviceState *i82378_dev;
  57     ISABus *isa_bus;
  58     qemu_irq rtc_irq;
  59     qemu_irq isa_irq;
  60     long size, i;
  61     char *palcode_filename;
  62     uint64_t palcode_entry;
  63     uint64_t kernel_entry, kernel_low;
  64     unsigned int smp_cpus = machine->smp.cpus;
  65
  66     /* Create up to 4 cpus.  */
  67     memset(cpus, 0, sizeof(cpus));
  68     for (i = 0; i < smp_cpus; ++i) {
  69         cpus[i] = ALPHA_CPU(cpu_create(machine->cpu_type));
  70     }
  71
  72     /*
  73      * arg0 -> memory size
  74      * arg1 -> kernel entry point
  75      * arg2 -> config word
  76      *
  77      * Config word: bits 0-5 -> ncpus
  78      *              bit  6   -> nographics option (for HWRPB CTB)
  79      *
  80      * See init_hwrpb() in the PALcode.
  81      */
  82     cpus[0]->env.trap_arg0 = ram_size;
  83     cpus[0]->env.trap_arg1 = 0;
  84     cpus[0]->env.trap_arg2 = smp_cpus | (!machine->enable_graphics << 6);
  85
  86     /*
  87      * Init the chipset.  Because we're using CLIPPER IRQ mappings,
  88      * the minimum PCI device IdSel is 1.
  89      */
  90     pci_bus = typhoon_init(machine->ram, &isa_irq, &rtc_irq, cpus,
  91                            clipper_pci_map_irq, PCI_DEVFN(1, 0));
  92
  93     /*
  94      * Init the PCI -> ISA bridge.
  95      *
  96      * Technically, PCI-based Alphas shipped with one of three different
  97      * PCI-ISA bridges:
  98      *
  99      * - Intel i82378 SIO
 100      * - Cypress CY82c693UB
 101      * - ALI M1533
 102      *
 103      * (An Intel i82375 PCI-EISA bridge was also used on some models.)
 104      *
 105      * For simplicity, we model an i82378 here, even though it wouldn't
 106      * have been on any Tsunami/Typhoon systems; it's close enough, and
 107      * we don't want to deal with modelling the CY82c693UB (which has
 108      * incompatible edge/level control registers, plus other peripherals
 109      * like IDE and USB) or the M1533 (which also has IDE and USB).
 110      *
 111      * Importantly, we need to provide a PCI device node for it, otherwise
 112      * some operating systems won't notice there's an ISA bus to configure.
 113      */
 114     i82378_dev = DEVICE(pci_create_simple(pci_bus, PCI_DEVFN(7, 0), "i82378"));
 115     isa_bus = ISA_BUS(qdev_get_child_bus(i82378_dev, "isa.0"));
 116
 117     /* Connect the ISA PIC to the Typhoon IRQ used for ISA interrupts. */
 118     qdev_connect_gpio_out(i82378_dev, 0, isa_irq);
 119
 120     /* Since we have an SRM-compatible PALcode, use the SRM epoch.  */
 121     mc146818_rtc_init(isa_bus, 1900, rtc_irq);
 122
 123     /* VGA setup.  Don't bother loading the bios.  */
 124     pci_vga_init(pci_bus);
 125
 126     /* Network setup.  e1000 is good enough, failing Tulip support.  */
 127     pci_init_nic_devices(pci_bus, mc->default_nic);
 128
 129     /* Super I/O */
 130     isa_create_simple(isa_bus, TYPE_SMC37C669_SUPERIO);
 131
 132     /* IDE disk setup.  */
 133     pci_dev = pci_create_simple(pci_bus, -1, "cmd646-ide");
 134     pci_ide_create_devs(pci_dev);
 135
 136     /* Load PALcode.  Given that this is not "real" cpu palcode,
 137        but one explicitly written for the emulation, we might as
 138        well load it directly from and ELF image.  */
 139     palcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
 140                                       machine->firmware ?: "palcode-clipper");
 141     if (palcode_filename == NULL) {
 142         error_report("no palcode provided");
 143         exit(1);
 144     }
 145     size = load_elf(palcode_filename, NULL, cpu_alpha_superpage_to_phys,
 146                     NULL, &palcode_entry, NULL, NULL, NULL,
 147                     0, EM_ALPHA, 0, 0);
 148     if (size < 0) {
 149         error_report("could not load palcode '%s'", palcode_filename);
 150         exit(1);
 151     }
 152     g_free(palcode_filename);
 153
 154     /* Start all cpus at the PALcode RESET entry point.  */
 155     for (i = 0; i < smp_cpus; ++i) {
 156         cpus[i]->env.pc = palcode_entry;
 157         cpus[i]->env.palbr = palcode_entry;
 158     }
 159
 160     /* Load a kernel.  */
 161     if (kernel_filename) {
 162         uint64_t param_offset;
 163
 164         size = load_elf(kernel_filename, NULL, cpu_alpha_superpage_to_phys,
 165                         NULL, &kernel_entry, &kernel_low, NULL, NULL,
 166                         0, EM_ALPHA, 0, 0);
 167         if (size < 0) {
 168             error_report("could not load kernel '%s'", kernel_filename);
 169             exit(1);
 170         }
 171
 172         cpus[0]->env.trap_arg1 = kernel_entry;
 173
 174         param_offset = kernel_low - 0x6000;
 175
 176         if (kernel_cmdline) {
 177             pstrcpy_targphys("cmdline", param_offset, 0x100, kernel_cmdline);
 178         }
 179
 180         if (initrd_filename) {
 181             long initrd_base;
 182             int64_t initrd_size;
 183
 184             initrd_size = get_image_size(initrd_filename);
 185             if (initrd_size < 0) {
 186                 error_report("could not load initial ram disk '%s'",
 187                              initrd_filename);
 188                 exit(1);
 189             }
 190
 191             /* Put the initrd image as high in memory as possible.  */
 192             initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK;
 193             load_image_targphys(initrd_filename, initrd_base,
 194                                 ram_size - initrd_base);
 195
 196             address_space_stq(&address_space_memory, param_offset + 0x100,
 197                               initrd_base + 0xfffffc0000000000ULL,
 198                               MEMTXATTRS_UNSPECIFIED,
 199                               NULL);
 200             address_space_stq(&address_space_memory, param_offset + 0x108,
 201                               initrd_size, MEMTXATTRS_UNSPECIFIED, NULL);
 202         }
 203     }
 204 }
 205
 206 static void clipper_machine_init(MachineClass *mc)
 207 {
 208     mc->desc = "Alpha DP264/CLIPPER";
 209     mc->init = clipper_init;
 210     mc->block_default_type = IF_IDE;
 211     mc->max_cpus = 4;
 212     mc->is_default = true;
 213     mc->default_cpu_type = ALPHA_CPU_TYPE_NAME("ev67");
 214     mc->default_ram_id = "ram";
 215     mc->default_nic = "e1000";
 216 }
 217
 218 DEFINE_MACHINE("clipper", clipper_machine_init)