blob: df4f2ae0ed580b479c4171d948ac93d28a578ca1 [file] [log] [blame]
/*
* 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/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>
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blk.h>
#endif
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/smp.h>
#include <asm/mmu_context.h>
#include <asm/cpcmd.h>
/*
* Machine setup..
*/
unsigned int console_mode = 0;
unsigned int console_device = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
struct { unsigned long addr, size, type; } memory_chunk[16] = { { 0 } };
#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
__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
*/
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, };
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);
/*
* 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_device = vdev;
return 1;
}
__setup("condev=", condev_setup);
static int __init conmode_setup(char *str)
{
#if defined(CONFIG_HWC_CONSOLE)
if (strncmp(str, "hwc", 4) == 0)
SET_CONSOLE_HWC;
#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 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_HWC_CONSOLE)
SET_CONSOLE_HWC;
#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_HWC_CONSOLE)
SET_CONSOLE_HWC;
#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_HWC_CONSOLE)
SET_CONSOLE_HWC;
#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_HWC_CONSOLE)
SET_CONSOLE_HWC;
#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.
*/
static void do_machine_restart_nonsmp(char * __unused)
{
reipl(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)
{
_machine_restart(command);
}
void machine_halt(void)
{
_machine_halt();
}
void machine_power_off(void)
{
_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;
struct resource *res;
unsigned long start_pfn, end_pfn;
static unsigned int smptrap=0;
unsigned long delay = 0;
struct _lowcore *lowcore;
int i;
if (smptrap)
return;
smptrap=1;
/*
* print what head.S has found out about the machine
*/
printk((MACHINE_IS_VM) ?
"We are running under VM (64 bit mode)\n" :
"We are running native (64 bit mode)\n");
ROOT_DEV = to_kdev_t(0x0100);
memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/
memory_end = memory_size & ~0x200000UL; /* 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) {
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 = memory_end >> PAGE_SHIFT;
/*
* Initialize the boot-time allocator
*/
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
/*
* Setup lowcore for boot cpu
*/
lowcore = (struct _lowcore *)
__alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
memset(lowcore, 0, 2*PAGE_SIZE);
lowcore->restart_psw.mask = _RESTART_PSW_MASK;
lowcore->restart_psw.addr = (addr_t) &restart_int_handler;
lowcore->external_new_psw.mask = _EXT_PSW_MASK;
lowcore->external_new_psw.addr = (addr_t) &ext_int_handler;
lowcore->svc_new_psw.mask = _SVC_PSW_MASK;
lowcore->svc_new_psw.addr = (addr_t) &system_call;
lowcore->program_new_psw.mask = _PGM_PSW_MASK;
lowcore->program_new_psw.addr = (addr_t) &pgm_check_handler;
lowcore->mcck_new_psw.mask = _MCCK_PSW_MASK;
lowcore->mcck_new_psw.addr = (addr_t) &mcck_int_handler;
lowcore->io_new_psw.mask = _IO_PSW_MASK;
lowcore->io_new_psw.addr = (addr_t) &io_int_handler;
lowcore->ipl_device = S390_lowcore.ipl_device;
lowcore->kernel_stack = ((__u64) &init_task_union) + 16384;
lowcore->async_stack = (__u64)
__alloc_bootmem(4*PAGE_SIZE, 4*PAGE_SIZE, 0) + 16384;
lowcore->jiffy_timer = -1LL;
if (MACHINE_HAS_DIAG44)
lowcore->diag44_opcode = 0x83000044;
else
lowcore->diag44_opcode = 0x07000700;
set_prefix((__u32)(__u64) lowcore);
cpu_init();
boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
__cpu_logical_map[0] = boot_cpu_addr;
/*
* Create kernel page tables and switch to virtual addressing.
*/
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);
/* 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",
smp_num_cpus, loops_per_jiffy/(500000/HZ),
(loops_per_jiffy/(5000/HZ))%100);
}
if (cpu_online_map & (1 << n)) {
cpuinfo = &safe_get_cpu_lowcore(n)->cpu_data;
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,
};