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, 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.pal_mode = 1;
 127         cpus[i]->env.pc = palcode_entry;
 128         cpus[i]->env.palbr = palcode_entry;
 129     }
 130
 131     /* Load a kernel.  */
 132     if (kernel_filename) {
 133         uint64_t param_offset;
 134
 135         size = load_elf(kernel_filename, cpu_alpha_superpage_to_phys,
 136                         NULL, &kernel_entry, &kernel_low, &kernel_high,
 137                         0, EM_ALPHA, 0, 0);
 138         if (size < 0) {
 139             error_report("could not load kernel '%s'", kernel_filename);
 140             exit(1);
 141         }
 142
 143         cpus[0]->env.trap_arg1 = kernel_entry;
 144
 145         param_offset = kernel_low - 0x6000;
 146
 147         if (kernel_cmdline) {
 148             pstrcpy_targphys("cmdline", param_offset, 0x100, kernel_cmdline);
 149         }
 150
 151         if (initrd_filename) {
 152             long initrd_base, initrd_size;
 153
 154             initrd_size = get_image_size(initrd_filename);
 155             if (initrd_size < 0) {
 156                 error_report("could not load initial ram disk '%s'",
 157                              initrd_filename);
 158                 exit(1);
 159             }
 160
 161             /* Put the initrd image as high in memory as possible.  */
 162             initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK;
 163             load_image_targphys(initrd_filename, initrd_base,
 164                                 ram_size - initrd_base);
 165
 166             address_space_stq(&address_space_memory, param_offset + 0x100,
 167                               initrd_base + 0xfffffc0000000000ULL,
 168                               MEMTXATTRS_UNSPECIFIED,
 169                               NULL);
 170             address_space_stq(&address_space_memory, param_offset + 0x108,
 171                               initrd_size, MEMTXATTRS_UNSPECIFIED, NULL);
 172         }
 173     }
 174 }
 175
 176 static void clipper_machine_init(MachineClass *mc)
 177 {
 178     mc->desc = "Alpha DP264/CLIPPER";
 179     mc->init = clipper_init;
 180     mc->max_cpus = 4;
 181     mc->is_default = 1;
 182 }
 183
 184 DEFINE_MACHINE("clipper", clipper_machine_init)