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 AlphaCPU *cpus[4]; 53 PCIBus *pci_bus; 54 PCIDevice *pci_dev; 55 DeviceState *i82378_dev; 56 ISABus *isa_bus; 57 qemu_irq rtc_irq; 58 qemu_irq isa_irq; 59 long size, i; 60 char *palcode_filename; 61 uint64_t palcode_entry; 62 uint64_t kernel_entry, kernel_low; 63 unsigned int smp_cpus = machine->smp.cpus; 64 65 /* Create up to 4 cpus. */ 66 memset(cpus, 0, sizeof(cpus)); 67 for (i = 0; i < smp_cpus; ++i) { 68 cpus[i] = ALPHA_CPU(cpu_create(machine->cpu_type)); 69 } 70 71 /* 72 * arg0 -> memory size 73 * arg1 -> kernel entry point 74 * arg2 -> config word 75 * 76 * Config word: bits 0-5 -> ncpus 77 * bit 6 -> nographics option (for HWRPB CTB) 78 * 79 * See init_hwrpb() in the PALcode. 80 */ 81 cpus[0]->env.trap_arg0 = ram_size; 82 cpus[0]->env.trap_arg1 = 0; 83 cpus[0]->env.trap_arg2 = smp_cpus | (!machine->enable_graphics << 6); 84 85 /* 86 * Init the chipset. Because we're using CLIPPER IRQ mappings, 87 * the minimum PCI device IdSel is 1. 88 */ 89 pci_bus = typhoon_init(machine->ram, &isa_irq, &rtc_irq, cpus, 90 clipper_pci_map_irq, PCI_DEVFN(1, 0)); 91 92 /* 93 * Init the PCI -> ISA bridge. 94 * 95 * Technically, PCI-based Alphas shipped with one of three different 96 * PCI-ISA bridges: 97 * 98 * - Intel i82378 SIO 99 * - Cypress CY82c693UB 100 * - ALI M1533 101 * 102 * (An Intel i82375 PCI-EISA bridge was also used on some models.) 103 * 104 * For simplicity, we model an i82378 here, even though it wouldn't 105 * have been on any Tsunami/Typhoon systems; it's close enough, and 106 * we don't want to deal with modelling the CY82c693UB (which has 107 * incompatible edge/level control registers, plus other peripherals 108 * like IDE and USB) or the M1533 (which also has IDE and USB). 109 * 110 * Importantly, we need to provide a PCI device node for it, otherwise 111 * some operating systems won't notice there's an ISA bus to configure. 112 */ 113 i82378_dev = DEVICE(pci_create_simple(pci_bus, PCI_DEVFN(7, 0), "i82378")); 114 isa_bus = ISA_BUS(qdev_get_child_bus(i82378_dev, "isa.0")); 115 116 /* Connect the ISA PIC to the Typhoon IRQ used for ISA interrupts. */ 117 qdev_connect_gpio_out(i82378_dev, 0, isa_irq); 118 119 /* Since we have an SRM-compatible PALcode, use the SRM epoch. */ 120 mc146818_rtc_init(isa_bus, 1900, rtc_irq); 121 122 /* VGA setup. Don't bother loading the bios. */ 123 pci_vga_init(pci_bus); 124 125 /* Network setup. e1000 is good enough, failing Tulip support. */ 126 for (i = 0; i < nb_nics; i++) { 127 pci_nic_init_nofail(&nd_table[i], pci_bus, "e1000", NULL); 128 } 129 130 /* Super I/O */ 131 isa_create_simple(isa_bus, TYPE_SMC37C669_SUPERIO); 132 133 /* IDE disk setup. */ 134 pci_dev = pci_create_simple(pci_bus, -1, "cmd646-ide"); 135 pci_ide_create_devs(pci_dev); 136 137 /* Load PALcode. Given that this is not "real" cpu palcode, 138 but one explicitly written for the emulation, we might as 139 well load it directly from and ELF image. */ 140 palcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, 141 machine->firmware ?: "palcode-clipper"); 142 if (palcode_filename == NULL) { 143 error_report("no palcode provided"); 144 exit(1); 145 } 146 size = load_elf(palcode_filename, NULL, cpu_alpha_superpage_to_phys, 147 NULL, &palcode_entry, NULL, NULL, NULL, 148 0, EM_ALPHA, 0, 0); 149 if (size < 0) { 150 error_report("could not load palcode '%s'", palcode_filename); 151 exit(1); 152 } 153 g_free(palcode_filename); 154 155 /* Start all cpus at the PALcode RESET entry point. */ 156 for (i = 0; i < smp_cpus; ++i) { 157 cpus[i]->env.pc = palcode_entry; 158 cpus[i]->env.palbr = palcode_entry; 159 } 160 161 /* Load a kernel. */ 162 if (kernel_filename) { 163 uint64_t param_offset; 164 165 size = load_elf(kernel_filename, NULL, cpu_alpha_superpage_to_phys, 166 NULL, &kernel_entry, &kernel_low, NULL, NULL, 167 0, EM_ALPHA, 0, 0); 168 if (size < 0) { 169 error_report("could not load kernel '%s'", kernel_filename); 170 exit(1); 171 } 172 173 cpus[0]->env.trap_arg1 = kernel_entry; 174 175 param_offset = kernel_low - 0x6000; 176 177 if (kernel_cmdline) { 178 pstrcpy_targphys("cmdline", param_offset, 0x100, kernel_cmdline); 179 } 180 181 if (initrd_filename) { 182 long initrd_base; 183 int64_t initrd_size; 184 185 initrd_size = get_image_size(initrd_filename); 186 if (initrd_size < 0) { 187 error_report("could not load initial ram disk '%s'", 188 initrd_filename); 189 exit(1); 190 } 191 192 /* Put the initrd image as high in memory as possible. */ 193 initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK; 194 load_image_targphys(initrd_filename, initrd_base, 195 ram_size - initrd_base); 196 197 address_space_stq(&address_space_memory, param_offset + 0x100, 198 initrd_base + 0xfffffc0000000000ULL, 199 MEMTXATTRS_UNSPECIFIED, 200 NULL); 201 address_space_stq(&address_space_memory, param_offset + 0x108, 202 initrd_size, MEMTXATTRS_UNSPECIFIED, NULL); 203 } 204 } 205 } 206 207 static void clipper_machine_init(MachineClass *mc) 208 { 209 mc->desc = "Alpha DP264/CLIPPER"; 210 mc->init = clipper_init; 211 mc->block_default_type = IF_IDE; 212 mc->max_cpus = 4; 213 mc->is_default = true; 214 mc->default_cpu_type = ALPHA_CPU_TYPE_NAME("ev67"); 215 mc->default_ram_id = "ram"; 216 } 217 218 DEFINE_MACHINE("clipper", clipper_machine_init) 219