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 "qemu-common.h"
  11 #include "cpu.h"
  12 #include "hw/hw.h"
  13 #include "elf.h"
  14 #include "hw/loader.h"
  15 #include "hw/boards.h"
  16 #include "alpha_sys.h"
  17 #include "qemu/error-report.h"
  18 #include "sysemu/sysemu.h"
  19 #include "hw/timer/mc146818rtc.h"
  20 #include "hw/ide.h"
  21 #include "hw/timer/i8254.h"
  22 #include "hw/char/serial.h"
  23 #include "qemu/cutils.h"
  24
  25 #define MAX_IDE_BUS 2
  26
  27 static uint64_t cpu_alpha_superpage_to_phys(void *opaque, uint64_t addr)
  28 {
  29     if (((addr >> 41) & 3) == 2) {
  30         addr &= 0xffffffffffull;
  31     }
  32     return addr;
  33 }
  34
  35 /* Note that there are at least 3 viewpoints of IRQ numbers on Alpha systems.
  36     (0) The dev_irq_n lines into the cpu, which we totally ignore,
  37     (1) The DRIR lines in the typhoon chipset,
  38     (2) The "vector" aka mangled interrupt number reported by SRM PALcode,
  39     (3) The interrupt number assigned by the kernel.
  40    The following function is concerned with (1) only.  */
  41
  42 static int clipper_pci_map_irq(PCIDevice *d, int irq_num)
  43 {
  44     int slot = d->devfn >> 3;
  45
  46     assert(irq_num >= 0 && irq_num <= 3);
  47
  48     return (slot + 1) * 4 + irq_num;
  49 }
  50
  51 static void clipper_init(MachineState *machine)
  52 {
  53     ram_addr_t ram_size = machine->ram_size;
  54     const char *cpu_model = machine->cpu_model;
  55     const char *kernel_filename = machine->kernel_filename;
  56     const char *kernel_cmdline = machine->kernel_cmdline;
  57     const char *initrd_filename = machine->initrd_filename;
  58     AlphaCPU *cpus[4];
  59     PCIBus *pci_bus;
  60     ISABus *isa_bus;
  61     qemu_irq rtc_irq;
  62     long size, i;
  63     char *palcode_filename;
  64     uint64_t palcode_entry, palcode_low, palcode_high;
  65     uint64_t kernel_entry, kernel_low, kernel_high;
  66
  67     /* Create up to 4 cpus.  */
  68     memset(cpus, 0, sizeof(cpus));
  69     for (i = 0; i < smp_cpus; ++i) {
  70         cpus[i] = cpu_alpha_init(cpu_model ? cpu_model : "ev67");
  71     }
  72
  73     cpus[0]->env.trap_arg0 = ram_size;
  74     cpus[0]->env.trap_arg1 = 0;
  75     cpus[0]->env.trap_arg2 = smp_cpus;
  76
  77     /* Init the chipset.  */
  78     pci_bus = typhoon_init(ram_size, &isa_bus, &rtc_irq, cpus,
  79                            clipper_pci_map_irq);
  80
  81     /* Since we have an SRM-compatible PALcode, use the SRM epoch.  */
  82     rtc_init(isa_bus, 1900, rtc_irq);
  83
  84     pit_init(isa_bus, 0x40, 0, NULL);
  85     isa_create_simple(isa_bus, "i8042");
  86
  87     /* VGA setup.  Don't bother loading the bios.  */
  88     pci_vga_init(pci_bus);
  89
  90     /* Serial code setup.  */
  91     serial_hds_isa_init(isa_bus, 0, MAX_SERIAL_PORTS);
  92
  93     /* Network setup.  e1000 is good enough, failing Tulip support.  */
  94     for (i = 0; i < nb_nics; i++) {
  95         pci_nic_init_nofail(&nd_table[i], pci_bus, "e1000", NULL);
  96     }
  97
  98     /* IDE disk setup.  */
  99     {
 100         DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
 101         ide_drive_get(hd, ARRAY_SIZE(hd));
 102
 103         pci_cmd646_ide_init(pci_bus, hd, 0);
 104     }
 105
 106     /* Load PALcode.  Given that this is not "real" cpu palcode,
 107        but one explicitly written for the emulation, we might as
 108        well load it directly from and ELF image.  */
 109     palcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
 110                                 bios_name ? bios_name : "palcode-clipper");
 111     if (palcode_filename == NULL) {
 112         error_report("no palcode provided");
 113         exit(1);
 114     }
 115     size = load_elf(palcode_filename, cpu_alpha_superpage_to_phys,
 116                     NULL, &palcode_entry, &palcode_low, &palcode_high,
 117                     0, EM_ALPHA, 0, 0);
 118     if (size < 0) {
 119         error_report("could not load palcode '%s'", palcode_filename);
 120         exit(1);
 121     }
 122     g_free(palcode_filename);
 123
 124     /* Start all cpus at the PALcode RESET entry point.  */
 125     for (i = 0; i < smp_cpus; ++i) {
 126         cpus[i]->env.pc = palcode_entry;
 127         cpus[i]->env.palbr = palcode_entry;
 128     }
 129
 130     /* Load a kernel.  */
 131     if (kernel_filename) {
 132         uint64_t param_offset;
 133
 134         size = load_elf(kernel_filename, cpu_alpha_superpage_to_phys,
 135                         NULL, &kernel_entry, &kernel_low, &kernel_high,
 136                         0, EM_ALPHA, 0, 0);
 137         if (size < 0) {
 138             error_report("could not load kernel '%s'", kernel_filename);
 139             exit(1);
 140         }
 141
 142         cpus[0]->env.trap_arg1 = kernel_entry;
 143
 144         param_offset = kernel_low - 0x6000;
 145
 146         if (kernel_cmdline) {
 147             pstrcpy_targphys("cmdline", param_offset, 0x100, kernel_cmdline);
 148         }
 149
 150         if (initrd_filename) {
 151             long initrd_base, initrd_size;
 152
 153             initrd_size = get_image_size(initrd_filename);
 154             if (initrd_size < 0) {
 155                 error_report("could not load initial ram disk '%s'",
 156                              initrd_filename);
 157                 exit(1);
 158             }
 159
 160             /* Put the initrd image as high in memory as possible.  */
 161             initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK;
 162             load_image_targphys(initrd_filename, initrd_base,
 163                                 ram_size - initrd_base);
 164
 165             address_space_stq(&address_space_memory, param_offset + 0x100,
 166                               initrd_base + 0xfffffc0000000000ULL,
 167                               MEMTXATTRS_UNSPECIFIED,
 168                               NULL);
 169             address_space_stq(&address_space_memory, param_offset + 0x108,
 170                               initrd_size, MEMTXATTRS_UNSPECIFIED, NULL);
 171         }
 172     }
 173 }
 174
 175 static void clipper_machine_init(MachineClass *mc)
 176 {
 177     mc->desc = "Alpha DP264/CLIPPER";
 178     mc->init = clipper_init;
 179     mc->block_default_type = IF_IDE;
 180     mc->max_cpus = 4;
 181     mc->is_default = 1;
 182 }
 183
 184 DEFINE_MACHINE("clipper", clipper_machine_init)