/* * arch/s390/kernel/setup.c * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Hartmut Penner (hp@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Derived from "arch/i386/kernel/setup.c" * Copyright (C) 1995, Linus Torvalds */ /* * This file handles the architecture-dependent parts of initialization */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_BLK_DEV_RAM #include #endif #include #include #include #include #include #include /* * Machine setup.. */ __u16 boot_cpu_addr; int cpus_initialized = 0; unsigned long cpu_initialized = 0; volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ /* * Setup options */ #ifdef CONFIG_BLK_DEV_RAM extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */ extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt*/ extern int rd_image_start; /* starting block # of image */ #endif extern int root_mountflags; extern int _text,_etext, _edata, _end; /* * This is set up by the setup-routine at boot-time * for S390 need to find out, what we have to setup * using address 0x10400 ... */ #include static char command_line[COMMAND_LINE_SIZE] = { 0, }; char saved_command_line[COMMAND_LINE_SIZE]; static struct resource code_resource = { "Kernel code", 0x100000, 0 }; static struct resource data_resource = { "Kernel data", 0, 0 }; /* * cpu_init() initializes state that is per-CPU. */ void __init cpu_init (void) { int nr = smp_processor_id(); int addr = hard_smp_processor_id(); if (test_and_set_bit(nr,&cpu_initialized)) { printk("CPU#%d ALREADY INITIALIZED!!!!!!!!!\n", nr); for (;;) __sti(); } cpus_initialized++; /* * Store processor id in lowcore (used e.g. in timer_interrupt) */ asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id)); S390_lowcore.cpu_data.cpu_addr = addr; S390_lowcore.cpu_data.cpu_nr = nr; /* * Force FPU initialization: */ current->flags &= ~PF_USEDFPU; current->used_math = 0; /* Setup active_mm for idle_task */ atomic_inc(&init_mm.mm_count); current->active_mm = &init_mm; if (current->mm) BUG(); enter_lazy_tlb(&init_mm, current, nr); } /* * VM halt and poweroff setup routines */ char vmhalt_cmd[128] = ""; char vmpoff_cmd[128] = ""; static inline void strncpy_skip_quote(char *dst, char *src, int n) { int sx, dx; dx = 0; for (sx = 0; src[sx] != 0; sx++) { if (src[sx] == '"') continue; dst[dx++] = src[sx]; if (dx >= n) break; } } static int __init vmhalt_setup(char *str) { strncpy_skip_quote(vmhalt_cmd, str, 127); vmhalt_cmd[127] = 0; return 1; } __setup("vmhalt=", vmhalt_setup); static int __init vmpoff_setup(char *str) { strncpy_skip_quote(vmpoff_cmd, str, 127); vmpoff_cmd[127] = 0; return 1; } __setup("vmpoff=", vmpoff_setup); /* * Reboot, halt and power_off routines for non SMP. */ #ifndef CONFIG_SMP void machine_restart(char * __unused) { reipl(S390_lowcore.ipl_device); } void machine_halt(void) { if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) cpcmd(vmhalt_cmd, NULL, 0); signal_processor(smp_processor_id(), sigp_stop_and_store_status); } void machine_power_off(void) { if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) cpcmd(vmpoff_cmd, NULL, 0); signal_processor(smp_processor_id(), sigp_stop_and_store_status); } #endif /* * Setup function called from init/main.c just after the banner * was printed. */ void __init setup_arch(char **cmdline_p) { unsigned long bootmap_size; unsigned long memory_start, memory_end; char c = ' ', cn, *to = command_line, *from = COMMAND_LINE; struct resource *res; unsigned long start_pfn, end_pfn; static unsigned int smptrap=0; unsigned long delay = 0; int len = 0; if (smptrap) return; smptrap=1; printk("Command line is: %s\n", COMMAND_LINE); /* * Setup lowcore information for boot cpu */ cpu_init(); boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; __cpu_logical_map[0] = boot_cpu_addr; /* * print what head.S has found out about the machine */ printk((MACHINE_IS_VM) ? "We are running under VM\n" : "We are running native\n"); ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV); #ifdef CONFIG_BLK_DEV_RAM rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); #endif /* nasty stuff with PARMAREAs. we use head.S or parameterline if (!MOUNT_ROOT_RDONLY) root_mountflags &= ~MS_RDONLY; */ memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/ memory_end = MEMORY_SIZE; /* detected in head.s */ init_mm.start_code = PAGE_OFFSET; init_mm.end_code = (unsigned long) &_etext; init_mm.end_data = (unsigned long) &_edata; init_mm.brk = (unsigned long) &_end; code_resource.start = (unsigned long) &_text; code_resource.end = (unsigned long) &_etext - 1; data_resource.start = (unsigned long) &_etext; data_resource.end = (unsigned long) &_edata - 1; /* Save unparsed command line copy for /proc/cmdline */ memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; for (;;) { /* * "mem=XXX[kKmM]" sets memsize */ if (c == ' ' && strncmp(from, "mem=", 4) == 0) { if (to != command_line) to--; memory_end = simple_strtoul(from+4, &from, 0); if ( *from == 'K' || *from == 'k' ) { memory_end = memory_end << 10; from++; } else if ( *from == 'M' || *from == 'm' ) { memory_end = memory_end << 20; from++; } } /* * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes */ if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) { if (to != command_line) to--; delay = simple_strtoul(from+9, &from, 0); if (*from == 's' || *from == 'S') { delay = delay*1000000; from++; } else if (*from == 'm' || *from == 'M') { delay = delay*60*1000000; from++; } /* now wait for the requestion amount of time */ udelay(delay); } cn = *(from++); if (!cn) break; if (cn == '\n') cn = ' '; /* replace newlines with space */ if (cn == ' ' && c == ' ') continue; /* remove additional spaces */ c = cn; if (COMMAND_LINE_SIZE <= ++len) break; *(to++) = c; } if (c == ' ' && to > command_line) to--; *to = '\0'; *cmdline_p = command_line; /* * partially used pages are not usable - thus * we are rounding upwards: */ start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT; end_pfn = memory_end >> PAGE_SHIFT; /* * Initialize the boot-time allocator */ bootmap_size = init_bootmem(start_pfn, end_pfn); /* * Register RAM pages with the bootmem allocator. */ free_bootmem(start_pfn << PAGE_SHIFT, (end_pfn - start_pfn) << PAGE_SHIFT); /* * Reserve the bootmem bitmap itself as well. We do this in two * steps (first step was init_bootmem()) because this catches * the (very unlikely) case of us accidentally initializing the * bootmem allocator with an invalid RAM area. */ reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); #ifdef CONFIG_BLK_DEV_INITRD if (INITRD_START) { if (INITRD_START + INITRD_SIZE <= memory_end) { reserve_bootmem(INITRD_START, INITRD_SIZE); initrd_start = INITRD_START; initrd_end = initrd_start + INITRD_SIZE; } else { printk("initrd extends beyond end of memory " "(0x%08lx > 0x%08lx)\ndisabling initrd\n", initrd_start + INITRD_SIZE, memory_end); initrd_start = initrd_end = 0; } } #endif paging_init(); res = alloc_bootmem_low(sizeof(struct resource)); res->start = 0; res->end = memory_end; res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; request_resource(&iomem_resource, res); request_resource(res, &code_resource); request_resource(res, &data_resource); } void print_cpu_info(struct cpuinfo_S390 *cpuinfo) { printk("cpu %d " #ifdef CONFIG_SMP "phys_idx=%d " #endif "vers=%02X ident=%06X machine=%04X unused=%04X\n", cpuinfo->cpu_nr, #ifdef CONFIG_SMP cpuinfo->cpu_addr, #endif cpuinfo->cpu_id.version, cpuinfo->cpu_id.ident, cpuinfo->cpu_id.machine, cpuinfo->cpu_id.unused); } /* * Get CPU information for use by the procfs. */ int get_cpuinfo(char * buffer) { struct cpuinfo_S390 *cpuinfo; char *p = buffer; int i; p += sprintf(p,"vendor_id : IBM/S390\n" "# processors : %i\n" "bogomips per cpu: %lu.%02lu\n", smp_num_cpus, loops_per_jiffy/(500000/HZ), (loops_per_jiffy/(5000/HZ))%100); for (i = 0; i < smp_num_cpus; i++) { cpuinfo = &safe_get_cpu_lowcore(i).cpu_data; p += sprintf(p,"processor %i: " "version = %02X, " "identification = %06X, " "machine = %04X\n", i, cpuinfo->cpu_id.version, cpuinfo->cpu_id.ident, cpuinfo->cpu_id.machine); } return p - buffer; }