diff options
Diffstat (limited to 'arch/s390/kernel/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 632 |
1 files changed, 632 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c new file mode 100644 index 000000000000..c879c40aa7a5 --- /dev/null +++ b/arch/s390/kernel/setup.c @@ -0,0 +1,632 @@ +/* + * 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 <linux/errno.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/user.h> +#include <linux/a.out.h> +#include <linux/tty.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/config.h> +#include <linux/init.h> +#include <linux/initrd.h> +#include <linux/bootmem.h> +#include <linux/root_dev.h> +#include <linux/console.h> +#include <linux/seq_file.h> +#include <linux/kernel_stat.h> + +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/smp.h> +#include <asm/mmu_context.h> +#include <asm/cpcmd.h> +#include <asm/lowcore.h> +#include <asm/irq.h> + +/* + * Machine setup.. + */ +unsigned int console_mode = 0; +unsigned int console_devno = -1; +unsigned int console_irq = -1; +unsigned long memory_size = 0; +unsigned long machine_flags = 0; +unsigned int default_storage_key = 0; +struct { + unsigned long addr, size, type; +} memory_chunk[MEMORY_CHUNKS] = { { 0 } }; +#define CHUNK_READ_WRITE 0 +#define CHUNK_READ_ONLY 1 +volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ + +/* + * Setup options + */ +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 <asm/setup.h> + +static char command_line[COMMAND_LINE_SIZE] = { 0, }; + +static struct resource code_resource = { + .name = "Kernel code", + .flags = IORESOURCE_BUSY | IORESOURCE_MEM, +}; + +static struct resource data_resource = { + .name = "Kernel data", + .flags = IORESOURCE_BUSY | IORESOURCE_MEM, +}; + +/* + * cpu_init() initializes state that is per-CPU. + */ +void __devinit cpu_init (void) +{ + int addr = hard_smp_processor_id(); + + /* + * 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; + + /* + * Force FPU initialization: + */ + clear_thread_flag(TIF_USEDFPU); + clear_used_math(); + + atomic_inc(&init_mm.mm_count); + current->active_mm = &init_mm; + if (current->mm) + BUG(); + enter_lazy_tlb(&init_mm, current); +} + +/* + * 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); + +/* + * condev= and conmode= setup parameter. + */ + +static int __init condev_setup(char *str) +{ + int vdev; + + vdev = simple_strtoul(str, &str, 0); + if (vdev >= 0 && vdev < 65536) { + console_devno = vdev; + console_irq = -1; + } + return 1; +} + +__setup("condev=", condev_setup); + +static int __init conmode_setup(char *str) +{ +#if defined(CONFIG_SCLP_CONSOLE) + if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) + SET_CONSOLE_SCLP; +#endif +#if defined(CONFIG_TN3215_CONSOLE) + if (strncmp(str, "3215", 5) == 0) + SET_CONSOLE_3215; +#endif +#if defined(CONFIG_TN3270_CONSOLE) + if (strncmp(str, "3270", 5) == 0) + SET_CONSOLE_3270; +#endif + return 1; +} + +__setup("conmode=", conmode_setup); + +static void __init conmode_default(void) +{ + char query_buffer[1024]; + char *ptr; + + if (MACHINE_IS_VM) { + __cpcmd("QUERY CONSOLE", query_buffer, 1024); + console_devno = simple_strtoul(query_buffer + 5, NULL, 16); + ptr = strstr(query_buffer, "SUBCHANNEL ="); + console_irq = simple_strtoul(ptr + 13, NULL, 16); + __cpcmd("QUERY TERM", query_buffer, 1024); + ptr = strstr(query_buffer, "CONMODE"); + /* + * Set the conmode to 3215 so that the device recognition + * will set the cu_type of the console to 3215. If the + * conmode is 3270 and we don't set it back then both + * 3215 and the 3270 driver will try to access the console + * device (3215 as console and 3270 as normal tty). + */ + __cpcmd("TERM CONMODE 3215", NULL, 0); + if (ptr == NULL) { +#if defined(CONFIG_SCLP_CONSOLE) + SET_CONSOLE_SCLP; +#endif + return; + } + if (strncmp(ptr + 8, "3270", 4) == 0) { +#if defined(CONFIG_TN3270_CONSOLE) + SET_CONSOLE_3270; +#elif defined(CONFIG_TN3215_CONSOLE) + SET_CONSOLE_3215; +#elif defined(CONFIG_SCLP_CONSOLE) + SET_CONSOLE_SCLP; +#endif + } else if (strncmp(ptr + 8, "3215", 4) == 0) { +#if defined(CONFIG_TN3215_CONSOLE) + SET_CONSOLE_3215; +#elif defined(CONFIG_TN3270_CONSOLE) + SET_CONSOLE_3270; +#elif defined(CONFIG_SCLP_CONSOLE) + SET_CONSOLE_SCLP; +#endif + } + } else if (MACHINE_IS_P390) { +#if defined(CONFIG_TN3215_CONSOLE) + SET_CONSOLE_3215; +#elif defined(CONFIG_TN3270_CONSOLE) + SET_CONSOLE_3270; +#endif + } else { +#if defined(CONFIG_SCLP_CONSOLE) + SET_CONSOLE_SCLP; +#endif + } +} + +#ifdef CONFIG_SMP +extern void machine_restart_smp(char *); +extern void machine_halt_smp(void); +extern void machine_power_off_smp(void); + +void (*_machine_restart)(char *command) = machine_restart_smp; +void (*_machine_halt)(void) = machine_halt_smp; +void (*_machine_power_off)(void) = machine_power_off_smp; +#else +/* + * Reboot, halt and power_off routines for non SMP. + */ +extern void reipl(unsigned long devno); +static void do_machine_restart_nonsmp(char * __unused) +{ + if (MACHINE_IS_VM) + cpcmd ("IPL", NULL, 0); + else + reipl (0x10000 | S390_lowcore.ipl_device); +} + +static void do_machine_halt_nonsmp(void) +{ + if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) + cpcmd(vmhalt_cmd, NULL, 0); + signal_processor(smp_processor_id(), sigp_stop_and_store_status); +} + +static void do_machine_power_off_nonsmp(void) +{ + if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) + cpcmd(vmpoff_cmd, NULL, 0); + signal_processor(smp_processor_id(), sigp_stop_and_store_status); +} + +void (*_machine_restart)(char *command) = do_machine_restart_nonsmp; +void (*_machine_halt)(void) = do_machine_halt_nonsmp; +void (*_machine_power_off)(void) = do_machine_power_off_nonsmp; +#endif + + /* + * Reboot, halt and power_off stubs. They just call _machine_restart, + * _machine_halt or _machine_power_off. + */ + +void machine_restart(char *command) +{ + console_unblank(); + _machine_restart(command); +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt(void) +{ + console_unblank(); + _machine_halt(); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off(void) +{ + console_unblank(); + _machine_power_off(); +} + +EXPORT_SYMBOL(machine_power_off); + +/* + * Setup function called from init/main.c just after the banner + * was printed. + */ +extern char _pstart, _pend, _stext; + +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; + unsigned long start_pfn, end_pfn; + static unsigned int smptrap=0; + unsigned long delay = 0; + struct _lowcore *lc; + int i; + + if (smptrap) + return; + smptrap=1; + + /* + * print what head.S has found out about the machine + */ +#ifndef CONFIG_ARCH_S390X + printk((MACHINE_IS_VM) ? + "We are running under VM (31 bit mode)\n" : + "We are running native (31 bit mode)\n"); + printk((MACHINE_HAS_IEEE) ? + "This machine has an IEEE fpu\n" : + "This machine has no IEEE fpu\n"); +#else /* CONFIG_ARCH_S390X */ + printk((MACHINE_IS_VM) ? + "We are running under VM (64 bit mode)\n" : + "We are running native (64 bit mode)\n"); +#endif /* CONFIG_ARCH_S390X */ + + ROOT_DEV = Root_RAM0; + memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/ +#ifndef CONFIG_ARCH_S390X + memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */ + /* + * We need some free virtual space to be able to do vmalloc. + * On a machine with 2GB memory we make sure that we have at + * least 128 MB free space for vmalloc. + */ + if (memory_end > 1920*1024*1024) + memory_end = 1920*1024*1024; +#else /* CONFIG_ARCH_S390X */ + memory_end = memory_size & ~0x200000UL; /* detected in head.s */ +#endif /* CONFIG_ARCH_S390X */ + 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) { + 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) { + 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 requested amount of time */ + udelay(delay); + } + cn = *(from++); + if (!cn) + break; + if (cn == '\n') + cn = ' '; /* replace newlines with space */ + if (cn == 0x0d) + cn = ' '; /* replace 0x0d with space */ + if (cn == ' ' && c == ' ') + continue; /* remove additional spaces */ + c = cn; + if (to - command_line >= COMMAND_LINE_SIZE) + 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 = max_pfn = memory_end >> PAGE_SHIFT; + + /* + * Initialize the boot-time allocator (with low memory only): + */ + bootmap_size = init_bootmem(start_pfn, end_pfn); + + /* + * Register RAM areas with the bootmem allocator. + */ + for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) { + unsigned long start_chunk, end_chunk; + + if (memory_chunk[i].type != CHUNK_READ_WRITE) + continue; + start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1); + start_chunk >>= PAGE_SHIFT; + end_chunk = (memory_chunk[i].addr + memory_chunk[i].size); + end_chunk >>= PAGE_SHIFT; + if (start_chunk < start_pfn) + start_chunk = start_pfn; + if (end_chunk > end_pfn) + end_chunk = end_pfn; + if (start_chunk < end_chunk) + free_bootmem(start_chunk << PAGE_SHIFT, + (end_chunk - start_chunk) << 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 + + for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) { + struct resource *res; + + res = alloc_bootmem_low(sizeof(struct resource)); + res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; + + switch (memory_chunk[i].type) { + case CHUNK_READ_WRITE: + res->name = "System RAM"; + break; + case CHUNK_READ_ONLY: + res->name = "System ROM"; + res->flags |= IORESOURCE_READONLY; + break; + default: + res->name = "reserved"; + } + res->start = memory_chunk[i].addr; + res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; + request_resource(&iomem_resource, res); + request_resource(res, &code_resource); + request_resource(res, &data_resource); + } + + /* + * Setup lowcore for boot cpu + */ +#ifndef CONFIG_ARCH_S390X + lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); + memset(lc, 0, PAGE_SIZE); +#else /* CONFIG_ARCH_S390X */ + lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0); + memset(lc, 0, 2*PAGE_SIZE); +#endif /* CONFIG_ARCH_S390X */ + lc->restart_psw.mask = PSW_BASE_BITS; + lc->restart_psw.addr = + PSW_ADDR_AMODE | (unsigned long) restart_int_handler; + lc->external_new_psw.mask = PSW_KERNEL_BITS; + lc->external_new_psw.addr = + PSW_ADDR_AMODE | (unsigned long) ext_int_handler; + lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT; + lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; + lc->program_new_psw.mask = PSW_KERNEL_BITS; + lc->program_new_psw.addr = + PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; + lc->mcck_new_psw.mask = PSW_KERNEL_BITS; + lc->mcck_new_psw.addr = + PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; + lc->io_new_psw.mask = PSW_KERNEL_BITS; + lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; + lc->ipl_device = S390_lowcore.ipl_device; + lc->jiffy_timer = -1LL; + lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; + lc->async_stack = (unsigned long) + __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; +#ifdef CONFIG_CHECK_STACK + lc->panic_stack = (unsigned long) + __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; +#endif + lc->current_task = (unsigned long) init_thread_union.thread_info.task; + lc->thread_info = (unsigned long) &init_thread_union; +#ifdef CONFIG_ARCH_S390X + if (MACHINE_HAS_DIAG44) + lc->diag44_opcode = 0x83000044; + else + lc->diag44_opcode = 0x07000700; +#endif /* CONFIG_ARCH_S390X */ + set_prefix((u32)(unsigned long) lc); + cpu_init(); + __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; + + /* + * Create kernel page tables and switch to virtual addressing. + */ + paging_init(); + + /* Setup default console */ + conmode_default(); +} + +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); +} + +/* + * show_cpuinfo - Get information on one CPU for use by procfs. + */ + +static int show_cpuinfo(struct seq_file *m, void *v) +{ + struct cpuinfo_S390 *cpuinfo; + unsigned long n = (unsigned long) v - 1; + + if (!n) { + seq_printf(m, "vendor_id : IBM/S390\n" + "# processors : %i\n" + "bogomips per cpu: %lu.%02lu\n", + num_online_cpus(), loops_per_jiffy/(500000/HZ), + (loops_per_jiffy/(5000/HZ))%100); + } + if (cpu_online(n)) { +#ifdef CONFIG_SMP + if (smp_processor_id() == n) + cpuinfo = &S390_lowcore.cpu_data; + else + cpuinfo = &lowcore_ptr[n]->cpu_data; +#else + cpuinfo = &S390_lowcore.cpu_data; +#endif + seq_printf(m, "processor %li: " + "version = %02X, " + "identification = %06X, " + "machine = %04X\n", + n, cpuinfo->cpu_id.version, + cpuinfo->cpu_id.ident, + cpuinfo->cpu_id.machine); + } + return 0; +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; +} +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return c_start(m, pos); +} +static void c_stop(struct seq_file *m, void *v) +{ +} +struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, +}; + |