1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
633 lines
17 KiB
C
633 lines
17 KiB
C
/*
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* arch/s390/kernel/setup.c
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "arch/i386/kernel/setup.c"
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* Copyright (C) 1995, Linus Torvalds
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*/
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/*
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* This file handles the architecture-dependent parts of initialization
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/bootmem.h>
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#include <linux/root_dev.h>
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#include <linux/console.h>
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#include <linux/seq_file.h>
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#include <linux/kernel_stat.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/smp.h>
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#include <asm/mmu_context.h>
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#include <asm/cpcmd.h>
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#include <asm/lowcore.h>
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#include <asm/irq.h>
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/*
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* Machine setup..
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*/
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unsigned int console_mode = 0;
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unsigned int console_devno = -1;
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unsigned int console_irq = -1;
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unsigned long memory_size = 0;
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unsigned long machine_flags = 0;
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unsigned int default_storage_key = 0;
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struct {
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unsigned long addr, size, type;
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} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
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#define CHUNK_READ_WRITE 0
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#define CHUNK_READ_ONLY 1
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volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
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/*
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* Setup options
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*/
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extern int _text,_etext, _edata, _end;
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/*
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* This is set up by the setup-routine at boot-time
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* for S390 need to find out, what we have to setup
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* using address 0x10400 ...
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*/
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#include <asm/setup.h>
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static char command_line[COMMAND_LINE_SIZE] = { 0, };
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static struct resource code_resource = {
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.name = "Kernel code",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource data_resource = {
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.name = "Kernel data",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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/*
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* cpu_init() initializes state that is per-CPU.
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*/
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void __devinit cpu_init (void)
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{
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int addr = hard_smp_processor_id();
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/*
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* Store processor id in lowcore (used e.g. in timer_interrupt)
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*/
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asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
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S390_lowcore.cpu_data.cpu_addr = addr;
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/*
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* Force FPU initialization:
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*/
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clear_thread_flag(TIF_USEDFPU);
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clear_used_math();
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atomic_inc(&init_mm.mm_count);
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current->active_mm = &init_mm;
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if (current->mm)
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BUG();
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enter_lazy_tlb(&init_mm, current);
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}
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/*
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* VM halt and poweroff setup routines
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*/
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char vmhalt_cmd[128] = "";
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char vmpoff_cmd[128] = "";
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static inline void strncpy_skip_quote(char *dst, char *src, int n)
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{
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int sx, dx;
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dx = 0;
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for (sx = 0; src[sx] != 0; sx++) {
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if (src[sx] == '"') continue;
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dst[dx++] = src[sx];
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if (dx >= n) break;
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}
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}
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static int __init vmhalt_setup(char *str)
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{
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strncpy_skip_quote(vmhalt_cmd, str, 127);
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vmhalt_cmd[127] = 0;
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return 1;
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}
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__setup("vmhalt=", vmhalt_setup);
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static int __init vmpoff_setup(char *str)
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{
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strncpy_skip_quote(vmpoff_cmd, str, 127);
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vmpoff_cmd[127] = 0;
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return 1;
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}
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__setup("vmpoff=", vmpoff_setup);
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/*
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* condev= and conmode= setup parameter.
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*/
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static int __init condev_setup(char *str)
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{
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int vdev;
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vdev = simple_strtoul(str, &str, 0);
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if (vdev >= 0 && vdev < 65536) {
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console_devno = vdev;
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console_irq = -1;
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}
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return 1;
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}
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__setup("condev=", condev_setup);
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static int __init conmode_setup(char *str)
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{
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#if defined(CONFIG_SCLP_CONSOLE)
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if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
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SET_CONSOLE_SCLP;
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#endif
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#if defined(CONFIG_TN3215_CONSOLE)
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if (strncmp(str, "3215", 5) == 0)
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SET_CONSOLE_3215;
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#endif
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#if defined(CONFIG_TN3270_CONSOLE)
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if (strncmp(str, "3270", 5) == 0)
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SET_CONSOLE_3270;
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#endif
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return 1;
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}
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__setup("conmode=", conmode_setup);
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static void __init conmode_default(void)
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{
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char query_buffer[1024];
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char *ptr;
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if (MACHINE_IS_VM) {
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__cpcmd("QUERY CONSOLE", query_buffer, 1024);
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console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
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ptr = strstr(query_buffer, "SUBCHANNEL =");
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console_irq = simple_strtoul(ptr + 13, NULL, 16);
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__cpcmd("QUERY TERM", query_buffer, 1024);
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ptr = strstr(query_buffer, "CONMODE");
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/*
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* Set the conmode to 3215 so that the device recognition
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* will set the cu_type of the console to 3215. If the
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* conmode is 3270 and we don't set it back then both
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* 3215 and the 3270 driver will try to access the console
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* device (3215 as console and 3270 as normal tty).
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*/
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__cpcmd("TERM CONMODE 3215", NULL, 0);
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if (ptr == NULL) {
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#if defined(CONFIG_SCLP_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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return;
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}
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if (strncmp(ptr + 8, "3270", 4) == 0) {
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#if defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#elif defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_SCLP_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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} else if (strncmp(ptr + 8, "3215", 4) == 0) {
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#if defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#elif defined(CONFIG_SCLP_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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}
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} else if (MACHINE_IS_P390) {
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#if defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#endif
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} else {
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#if defined(CONFIG_SCLP_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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}
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}
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#ifdef CONFIG_SMP
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extern void machine_restart_smp(char *);
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extern void machine_halt_smp(void);
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extern void machine_power_off_smp(void);
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void (*_machine_restart)(char *command) = machine_restart_smp;
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void (*_machine_halt)(void) = machine_halt_smp;
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void (*_machine_power_off)(void) = machine_power_off_smp;
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#else
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/*
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* Reboot, halt and power_off routines for non SMP.
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*/
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extern void reipl(unsigned long devno);
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static void do_machine_restart_nonsmp(char * __unused)
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{
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if (MACHINE_IS_VM)
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cpcmd ("IPL", NULL, 0);
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else
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reipl (0x10000 | S390_lowcore.ipl_device);
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}
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static void do_machine_halt_nonsmp(void)
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{
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if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
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cpcmd(vmhalt_cmd, NULL, 0);
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signal_processor(smp_processor_id(), sigp_stop_and_store_status);
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}
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static void do_machine_power_off_nonsmp(void)
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{
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if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
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cpcmd(vmpoff_cmd, NULL, 0);
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signal_processor(smp_processor_id(), sigp_stop_and_store_status);
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}
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void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
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void (*_machine_halt)(void) = do_machine_halt_nonsmp;
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void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
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#endif
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/*
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* Reboot, halt and power_off stubs. They just call _machine_restart,
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* _machine_halt or _machine_power_off.
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*/
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void machine_restart(char *command)
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{
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console_unblank();
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_machine_restart(command);
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}
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EXPORT_SYMBOL(machine_restart);
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void machine_halt(void)
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{
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console_unblank();
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_machine_halt();
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}
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EXPORT_SYMBOL(machine_halt);
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void machine_power_off(void)
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{
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console_unblank();
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_machine_power_off();
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}
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EXPORT_SYMBOL(machine_power_off);
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/*
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* Setup function called from init/main.c just after the banner
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* was printed.
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*/
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extern char _pstart, _pend, _stext;
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void __init setup_arch(char **cmdline_p)
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{
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unsigned long bootmap_size;
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unsigned long memory_start, memory_end;
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char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
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unsigned long start_pfn, end_pfn;
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static unsigned int smptrap=0;
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unsigned long delay = 0;
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struct _lowcore *lc;
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int i;
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if (smptrap)
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return;
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smptrap=1;
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/*
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* print what head.S has found out about the machine
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*/
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#ifndef CONFIG_ARCH_S390X
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printk((MACHINE_IS_VM) ?
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"We are running under VM (31 bit mode)\n" :
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"We are running native (31 bit mode)\n");
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printk((MACHINE_HAS_IEEE) ?
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"This machine has an IEEE fpu\n" :
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"This machine has no IEEE fpu\n");
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#else /* CONFIG_ARCH_S390X */
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printk((MACHINE_IS_VM) ?
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"We are running under VM (64 bit mode)\n" :
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"We are running native (64 bit mode)\n");
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#endif /* CONFIG_ARCH_S390X */
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ROOT_DEV = Root_RAM0;
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memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/
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#ifndef CONFIG_ARCH_S390X
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memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
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/*
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* We need some free virtual space to be able to do vmalloc.
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* On a machine with 2GB memory we make sure that we have at
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* least 128 MB free space for vmalloc.
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*/
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if (memory_end > 1920*1024*1024)
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memory_end = 1920*1024*1024;
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#else /* CONFIG_ARCH_S390X */
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memory_end = memory_size & ~0x200000UL; /* detected in head.s */
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#endif /* CONFIG_ARCH_S390X */
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init_mm.start_code = PAGE_OFFSET;
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init_mm.end_code = (unsigned long) &_etext;
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init_mm.end_data = (unsigned long) &_edata;
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init_mm.brk = (unsigned long) &_end;
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code_resource.start = (unsigned long) &_text;
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code_resource.end = (unsigned long) &_etext - 1;
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data_resource.start = (unsigned long) &_etext;
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data_resource.end = (unsigned long) &_edata - 1;
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/* Save unparsed command line copy for /proc/cmdline */
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memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
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saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
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for (;;) {
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/*
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* "mem=XXX[kKmM]" sets memsize
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*/
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if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
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memory_end = simple_strtoul(from+4, &from, 0);
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if ( *from == 'K' || *from == 'k' ) {
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memory_end = memory_end << 10;
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from++;
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} else if ( *from == 'M' || *from == 'm' ) {
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memory_end = memory_end << 20;
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from++;
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}
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}
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/*
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* "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
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*/
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if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
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delay = simple_strtoul(from+9, &from, 0);
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if (*from == 's' || *from == 'S') {
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delay = delay*1000000;
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from++;
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} else if (*from == 'm' || *from == 'M') {
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delay = delay*60*1000000;
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from++;
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}
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/* now wait for the requested amount of time */
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udelay(delay);
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}
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cn = *(from++);
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if (!cn)
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break;
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if (cn == '\n')
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cn = ' '; /* replace newlines with space */
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if (cn == 0x0d)
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cn = ' '; /* replace 0x0d with space */
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if (cn == ' ' && c == ' ')
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continue; /* remove additional spaces */
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c = cn;
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if (to - command_line >= COMMAND_LINE_SIZE)
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break;
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*(to++) = c;
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}
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if (c == ' ' && to > command_line) to--;
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*to = '\0';
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*cmdline_p = command_line;
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/*
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* partially used pages are not usable - thus
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* we are rounding upwards:
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*/
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start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
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end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
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/*
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* Initialize the boot-time allocator (with low memory only):
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*/
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bootmap_size = init_bootmem(start_pfn, end_pfn);
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/*
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* Register RAM areas with the bootmem allocator.
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*/
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for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
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unsigned long start_chunk, end_chunk;
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if (memory_chunk[i].type != CHUNK_READ_WRITE)
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continue;
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start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
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start_chunk >>= PAGE_SHIFT;
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end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
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end_chunk >>= PAGE_SHIFT;
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if (start_chunk < start_pfn)
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start_chunk = start_pfn;
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if (end_chunk > end_pfn)
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end_chunk = end_pfn;
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if (start_chunk < end_chunk)
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free_bootmem(start_chunk << PAGE_SHIFT,
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(end_chunk - start_chunk) << PAGE_SHIFT);
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}
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/*
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* Reserve the bootmem bitmap itself as well. We do this in two
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* steps (first step was init_bootmem()) because this catches
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* the (very unlikely) case of us accidentally initializing the
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* bootmem allocator with an invalid RAM area.
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*/
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reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (INITRD_START) {
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if (INITRD_START + INITRD_SIZE <= memory_end) {
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reserve_bootmem(INITRD_START, INITRD_SIZE);
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initrd_start = INITRD_START;
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initrd_end = initrd_start + INITRD_SIZE;
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} else {
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printk("initrd extends beyond end of memory "
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"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
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initrd_start + INITRD_SIZE, memory_end);
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initrd_start = initrd_end = 0;
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}
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}
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#endif
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for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
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struct resource *res;
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res = alloc_bootmem_low(sizeof(struct resource));
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res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
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switch (memory_chunk[i].type) {
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case CHUNK_READ_WRITE:
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res->name = "System RAM";
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break;
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case CHUNK_READ_ONLY:
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res->name = "System ROM";
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res->flags |= IORESOURCE_READONLY;
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break;
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default:
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res->name = "reserved";
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}
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res->start = memory_chunk[i].addr;
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res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
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request_resource(&iomem_resource, res);
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request_resource(res, &code_resource);
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request_resource(res, &data_resource);
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}
|
|
|
|
/*
|
|
* 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,
|
|
};
|
|
|