316 lines
8.0 KiB
C
316 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright IBM Corp. 2007, 2009
|
|
* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "setup"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/extable.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/diag.h>
|
|
#include <asm/ebcdic.h>
|
|
#include <asm/ipl.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/sysinfo.h>
|
|
#include <asm/cpcmd.h>
|
|
#include <asm/sclp.h>
|
|
#include <asm/facility.h>
|
|
#include <asm/boot_data.h>
|
|
#include <asm/switch_to.h>
|
|
#include "entry.h"
|
|
|
|
static void __init reset_tod_clock(void)
|
|
{
|
|
u64 time;
|
|
|
|
if (store_tod_clock(&time) == 0)
|
|
return;
|
|
/* TOD clock not running. Set the clock to Unix Epoch. */
|
|
if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
|
|
disabled_wait();
|
|
|
|
memset(tod_clock_base, 0, 16);
|
|
*(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
|
|
S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
|
|
}
|
|
|
|
/*
|
|
* Initialize storage key for kernel pages
|
|
*/
|
|
static noinline __init void init_kernel_storage_key(void)
|
|
{
|
|
#if PAGE_DEFAULT_KEY
|
|
unsigned long end_pfn, init_pfn;
|
|
|
|
end_pfn = PFN_UP(__pa(_end));
|
|
|
|
for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
|
|
page_set_storage_key(init_pfn << PAGE_SHIFT,
|
|
PAGE_DEFAULT_KEY, 0);
|
|
#endif
|
|
}
|
|
|
|
static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
|
|
|
|
static noinline __init void detect_machine_type(void)
|
|
{
|
|
struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
|
|
|
|
/* Check current-configuration-level */
|
|
if (stsi(NULL, 0, 0, 0) <= 2) {
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
|
|
return;
|
|
}
|
|
/* Get virtual-machine cpu information. */
|
|
if (stsi(vmms, 3, 2, 2) || !vmms->count)
|
|
return;
|
|
|
|
/* Detect known hypervisors */
|
|
if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
|
|
else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
|
|
}
|
|
|
|
/* Remove leading, trailing and double whitespace. */
|
|
static inline void strim_all(char *str)
|
|
{
|
|
char *s;
|
|
|
|
s = strim(str);
|
|
if (s != str)
|
|
memmove(str, s, strlen(s));
|
|
while (*str) {
|
|
if (!isspace(*str++))
|
|
continue;
|
|
if (isspace(*str)) {
|
|
s = skip_spaces(str);
|
|
memmove(str, s, strlen(s) + 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
static noinline __init void setup_arch_string(void)
|
|
{
|
|
struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
|
|
struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
|
|
char mstr[80], hvstr[17];
|
|
|
|
if (stsi(mach, 1, 1, 1))
|
|
return;
|
|
EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
|
|
EBCASC(mach->type, sizeof(mach->type));
|
|
EBCASC(mach->model, sizeof(mach->model));
|
|
EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
|
|
sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
|
|
mach->manufacturer, mach->type,
|
|
mach->model, mach->model_capacity);
|
|
strim_all(mstr);
|
|
if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
|
|
EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
|
|
sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
|
|
strim_all(hvstr);
|
|
} else {
|
|
sprintf(hvstr, "%s",
|
|
MACHINE_IS_LPAR ? "LPAR" :
|
|
MACHINE_IS_VM ? "z/VM" :
|
|
MACHINE_IS_KVM ? "KVM" : "unknown");
|
|
}
|
|
dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
|
|
}
|
|
|
|
static __init void setup_topology(void)
|
|
{
|
|
int max_mnest;
|
|
|
|
if (!test_facility(11))
|
|
return;
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
|
|
for (max_mnest = 6; max_mnest > 1; max_mnest--) {
|
|
if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
|
|
break;
|
|
}
|
|
topology_max_mnest = max_mnest;
|
|
}
|
|
|
|
static void early_pgm_check_handler(void)
|
|
{
|
|
const struct exception_table_entry *fixup;
|
|
unsigned long cr0, cr0_new;
|
|
unsigned long addr;
|
|
|
|
addr = S390_lowcore.program_old_psw.addr;
|
|
fixup = s390_search_extables(addr);
|
|
if (!fixup)
|
|
disabled_wait();
|
|
/* Disable low address protection before storing into lowcore. */
|
|
__ctl_store(cr0, 0, 0);
|
|
cr0_new = cr0 & ~(1UL << 28);
|
|
__ctl_load(cr0_new, 0, 0);
|
|
S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
|
|
__ctl_load(cr0, 0, 0);
|
|
}
|
|
|
|
static noinline __init void setup_lowcore_early(void)
|
|
{
|
|
psw_t psw;
|
|
|
|
psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
|
|
if (IS_ENABLED(CONFIG_KASAN))
|
|
psw.mask |= PSW_MASK_DAT;
|
|
psw.addr = (unsigned long) s390_base_ext_handler;
|
|
S390_lowcore.external_new_psw = psw;
|
|
psw.addr = (unsigned long) s390_base_pgm_handler;
|
|
S390_lowcore.program_new_psw = psw;
|
|
s390_base_pgm_handler_fn = early_pgm_check_handler;
|
|
S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
|
|
}
|
|
|
|
static noinline __init void setup_facility_list(void)
|
|
{
|
|
memcpy(S390_lowcore.alt_stfle_fac_list,
|
|
S390_lowcore.stfle_fac_list,
|
|
sizeof(S390_lowcore.alt_stfle_fac_list));
|
|
if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
|
|
__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
|
|
}
|
|
|
|
static __init void detect_diag9c(void)
|
|
{
|
|
unsigned int cpu_address;
|
|
int rc;
|
|
|
|
cpu_address = stap();
|
|
diag_stat_inc(DIAG_STAT_X09C);
|
|
asm volatile(
|
|
" diag %2,0,0x9c\n"
|
|
"0: la %0,0\n"
|
|
"1:\n"
|
|
EX_TABLE(0b,1b)
|
|
: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
|
|
if (!rc)
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
|
|
}
|
|
|
|
static __init void detect_machine_facilities(void)
|
|
{
|
|
if (test_facility(8)) {
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
|
|
__ctl_set_bit(0, 23);
|
|
}
|
|
if (test_facility(78))
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
|
|
if (test_facility(3))
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
|
|
if (test_facility(50) && test_facility(73)) {
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
|
|
__ctl_set_bit(0, 55);
|
|
}
|
|
if (test_facility(51))
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
|
|
if (test_facility(129)) {
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
|
|
__ctl_set_bit(0, 17);
|
|
}
|
|
if (test_facility(130) && !noexec_disabled) {
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
|
|
__ctl_set_bit(0, 20);
|
|
}
|
|
if (test_facility(133))
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
|
|
if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
|
|
/* Enabled signed clock comparator comparisons */
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
|
|
clock_comparator_max = -1ULL >> 1;
|
|
__ctl_set_bit(0, 53);
|
|
}
|
|
}
|
|
|
|
static inline void save_vector_registers(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (test_facility(129))
|
|
save_vx_regs(boot_cpu_vector_save_area);
|
|
#endif
|
|
}
|
|
|
|
static inline void setup_control_registers(void)
|
|
{
|
|
unsigned long reg;
|
|
|
|
__ctl_store(reg, 0, 0);
|
|
reg |= CR0_LOW_ADDRESS_PROTECTION;
|
|
reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
|
|
reg |= CR0_EXTERNAL_CALL_SUBMASK;
|
|
__ctl_load(reg, 0, 0);
|
|
}
|
|
|
|
static inline void setup_access_registers(void)
|
|
{
|
|
unsigned int acrs[NUM_ACRS] = { 0 };
|
|
|
|
restore_access_regs(acrs);
|
|
}
|
|
|
|
static int __init disable_vector_extension(char *str)
|
|
{
|
|
S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
|
|
__ctl_clear_bit(0, 17);
|
|
return 0;
|
|
}
|
|
early_param("novx", disable_vector_extension);
|
|
|
|
char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
|
|
static void __init setup_boot_command_line(void)
|
|
{
|
|
/* copy arch command line */
|
|
strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
|
|
}
|
|
|
|
static void __init check_image_bootable(void)
|
|
{
|
|
if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
|
|
return;
|
|
|
|
sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
|
|
sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
|
|
sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
|
|
disabled_wait();
|
|
}
|
|
|
|
void __init startup_init(void)
|
|
{
|
|
reset_tod_clock();
|
|
check_image_bootable();
|
|
time_early_init();
|
|
init_kernel_storage_key();
|
|
lockdep_off();
|
|
setup_lowcore_early();
|
|
setup_facility_list();
|
|
detect_machine_type();
|
|
setup_arch_string();
|
|
setup_boot_command_line();
|
|
detect_diag9c();
|
|
detect_machine_facilities();
|
|
save_vector_registers();
|
|
setup_topology();
|
|
sclp_early_detect();
|
|
setup_control_registers();
|
|
setup_access_registers();
|
|
lockdep_on();
|
|
}
|