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 for (i = 0; i < nb_nics; i++) { 128 pci_nic_init_nofail(&nd_table[i], pci_bus, mc->default_nic, NULL); 129 } 130 131 /* Super I/O */ 132 isa_create_simple(isa_bus, TYPE_SMC37C669_SUPERIO); 133 134 /* IDE disk setup. */ 135 pci_dev = pci_create_simple(pci_bus, -1, "cmd646-ide"); 136 pci_ide_create_devs(pci_dev); 137 138 /* Load PALcode. Given that this is not "real" cpu palcode, 139 but one explicitly written for the emulation, we might as 140 well load it directly from and ELF image. */ 141 palcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, 142 machine->firmware ?: "palcode-clipper"); 143 if (palcode_filename == NULL) { 144 error_report("no palcode provided"); 145 exit(1); 146 } 147 size = load_elf(palcode_filename, NULL, cpu_alpha_superpage_to_phys, 148 NULL, &palcode_entry, NULL, NULL, NULL, 149 0, EM_ALPHA, 0, 0); 150 if (size < 0) { 151 error_report("could not load palcode '%s'", palcode_filename); 152 exit(1); 153 } 154 g_free(palcode_filename); 155 156 /* Start all cpus at the PALcode RESET entry point. */ 157 for (i = 0; i < smp_cpus; ++i) { 158 cpus[i]->env.pc = palcode_entry; 159 cpus[i]->env.palbr = palcode_entry; 160 } 161 162 /* Load a kernel. */ 163 if (kernel_filename) { 164 uint64_t param_offset; 165 166 size = load_elf(kernel_filename, NULL, cpu_alpha_superpage_to_phys, 167 NULL, &kernel_entry, &kernel_low, NULL, NULL, 168 0, EM_ALPHA, 0, 0); 169 if (size < 0) { 170 error_report("could not load kernel '%s'", kernel_filename); 171 exit(1); 172 } 173 174 cpus[0]->env.trap_arg1 = kernel_entry; 175 176 param_offset = kernel_low - 0x6000; 177 178 if (kernel_cmdline) { 179 pstrcpy_targphys("cmdline", param_offset, 0x100, kernel_cmdline); 180 } 181 182 if (initrd_filename) { 183 long initrd_base; 184 int64_t initrd_size; 185 186 initrd_size = get_image_size(initrd_filename); 187 if (initrd_size < 0) { 188 error_report("could not load initial ram disk '%s'", 189 initrd_filename); 190 exit(1); 191 } 192 193 /* Put the initrd image as high in memory as possible. */ 194 initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK; 195 load_image_targphys(initrd_filename, initrd_base, 196 ram_size - initrd_base); 197 198 address_space_stq(&address_space_memory, param_offset + 0x100, 199 initrd_base + 0xfffffc0000000000ULL, 200 MEMTXATTRS_UNSPECIFIED, 201 NULL); 202 address_space_stq(&address_space_memory, param_offset + 0x108, 203 initrd_size, MEMTXATTRS_UNSPECIFIED, NULL); 204 } 205 } 206 } 207 208 static void clipper_machine_init(MachineClass *mc) 209 { 210 mc->desc = "Alpha DP264/CLIPPER"; 211 mc->init = clipper_init; 212 mc->block_default_type = IF_IDE; 213 mc->max_cpus = 4; 214 mc->is_default = true; 215 mc->default_cpu_type = ALPHA_CPU_TYPE_NAME("ev67"); 216 mc->default_ram_id = "ram"; 217 mc->default_nic = "e1000"; 218 } 219 220 DEFINE_MACHINE("clipper", clipper_machine_init) 221