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 "hw/hw.h"
  10 #include "elf.h"
  11 #include "hw/loader.h"
  12 #include "hw/boards.h"
  13 #include "alpha_sys.h"
  14 #include "sysemu/sysemu.h"
  15 #include "hw/timer/mc146818rtc.h"
  16 #include "hw/ide.h"
  17 #include "hw/timer/i8254.h"
  18 #include "hw/char/serial.h"
  19
  20 #define MAX_IDE_BUS 2
  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 *cpu_model = machine->cpu_model;
  50     const char *kernel_filename = machine->kernel_filename;
  51     const char *kernel_cmdline = machine->kernel_cmdline;
  52     const char *initrd_filename = machine->initrd_filename;
  53     AlphaCPU *cpus[4];
  54     PCIBus *pci_bus;
  55     ISABus *isa_bus;
  56     qemu_irq rtc_irq;
  57     long size, i;
  58     char *palcode_filename;
  59     uint64_t palcode_entry, palcode_low, palcode_high;
  60     uint64_t kernel_entry, kernel_low, kernel_high;
  61
  62     /* Create up to 4 cpus.  */
  63     memset(cpus, 0, sizeof(cpus));
  64     for (i = 0; i < smp_cpus; ++i) {
  65         cpus[i] = cpu_alpha_init(cpu_model ? cpu_model : "ev67");
  66     }
  67
  68     cpus[0]->env.trap_arg0 = ram_size;
  69     cpus[0]->env.trap_arg1 = 0;
  70     cpus[0]->env.trap_arg2 = smp_cpus;
  71
  72     /* Init the chipset.  */
  73     pci_bus = typhoon_init(ram_size, &isa_bus, &rtc_irq, cpus,
  74                            clipper_pci_map_irq);
  75
  76     /* Since we have an SRM-compatible PALcode, use the SRM epoch.  */
  77     rtc_init(isa_bus, 1900, rtc_irq);
  78
  79     pit_init(isa_bus, 0x40, 0, NULL);
  80     isa_create_simple(isa_bus, "i8042");
  81
  82     /* VGA setup.  Don't bother loading the bios.  */
  83     pci_vga_init(pci_bus);
  84
  85     /* Serial code setup.  */
  86     serial_hds_isa_init(isa_bus, MAX_SERIAL_PORTS);
  87
  88     /* Network setup.  e1000 is good enough, failing Tulip support.  */
  89     for (i = 0; i < nb_nics; i++) {
  90         pci_nic_init_nofail(&nd_table[i], pci_bus, "e1000", NULL);
  91     }
  92
  93     /* IDE disk setup.  */
  94     {
  95         DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
  96         ide_drive_get(hd, ARRAY_SIZE(hd));
  97
  98         pci_cmd646_ide_init(pci_bus, hd, 0);
  99     }
 100
 101     /* Load PALcode.  Given that this is not "real" cpu palcode,
 102        but one explicitly written for the emulation, we might as
 103        well load it directly from and ELF image.  */
 104     palcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
 105                                 bios_name ? bios_name : "palcode-clipper");
 106     if (palcode_filename == NULL) {
 107         hw_error("no palcode provided\n");
 108         exit(1);
 109     }
 110     size = load_elf(palcode_filename, cpu_alpha_superpage_to_phys,
 111                     NULL, &palcode_entry, &palcode_low, &palcode_high,
 112                     0, EM_ALPHA, 0);
 113     if (size < 0) {
 114         hw_error("could not load palcode '%s'\n", palcode_filename);
 115         exit(1);
 116     }
 117     g_free(palcode_filename);
 118
 119     /* Start all cpus at the PALcode RESET entry point.  */
 120     for (i = 0; i < smp_cpus; ++i) {
 121         cpus[i]->env.pal_mode = 1;
 122         cpus[i]->env.pc = palcode_entry;
 123         cpus[i]->env.palbr = palcode_entry;
 124     }
 125
 126     /* Load a kernel.  */
 127     if (kernel_filename) {
 128         uint64_t param_offset;
 129
 130         size = load_elf(kernel_filename, cpu_alpha_superpage_to_phys,
 131                         NULL, &kernel_entry, &kernel_low, &kernel_high,
 132                         0, EM_ALPHA, 0);
 133         if (size < 0) {
 134             hw_error("could not load kernel '%s'\n", kernel_filename);
 135             exit(1);
 136         }
 137
 138         cpus[0]->env.trap_arg1 = kernel_entry;
 139
 140         param_offset = kernel_low - 0x6000;
 141
 142         if (kernel_cmdline) {
 143             pstrcpy_targphys("cmdline", param_offset, 0x100, kernel_cmdline);
 144         }
 145
 146         if (initrd_filename) {
 147             long initrd_base, initrd_size;
 148
 149             initrd_size = get_image_size(initrd_filename);
 150             if (initrd_size < 0) {
 151                 hw_error("could not load initial ram disk '%s'\n",
 152                          initrd_filename);
 153                 exit(1);
 154             }
 155
 156             /* Put the initrd image as high in memory as possible.  */
 157             initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK;
 158             load_image_targphys(initrd_filename, initrd_base,
 159                                 ram_size - initrd_base);
 160
 161             address_space_stq(&address_space_memory, param_offset + 0x100,
 162                               initrd_base + 0xfffffc0000000000ULL,
 163                               MEMTXATTRS_UNSPECIFIED,
 164                               NULL);
 165             address_space_stq(&address_space_memory, param_offset + 0x108,
 166                               initrd_size, MEMTXATTRS_UNSPECIFIED, NULL);
 167         }
 168     }
 169 }
 170
 171 static QEMUMachine clipper_machine = {
 172     .name = "clipper",
 173     .desc = "Alpha DP264/CLIPPER",
 174     .init = clipper_init,
 175     .max_cpus = 4,
 176     .is_default = 1,
 177 };
 178
 179 static void clipper_machine_init(void)
 180 {
 181     qemu_register_machine(&clipper_machine);
 182 }
 183
 184 machine_init(clipper_machine_init);