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// 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 "entry.h"
/*
* Create a Kernel NSS if the SAVESYS= parameter is defined
*/
#define DEFSYS_CMD_SIZE 128
#define SAVESYS_CMD_SIZE 32
char kernel_nss_name[NSS_NAME_SIZE + 1];
static void __init setup_boot_command_line(void);
/*
* Get the TOD clock running.
*/
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(0);
memset(tod_clock_base, 0, 16);
*(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
}
#ifdef CONFIG_SHARED_KERNEL
int __init savesys_ipl_nss(char *cmd, const int cmdlen);
asm(
" .section .init.text,\"ax\",@progbits\n"
" .align 4\n"
" .type savesys_ipl_nss, @function\n"
"savesys_ipl_nss:\n"
" stmg 6,15,48(15)\n"
" lgr 14,3\n"
" sam31\n"
" diag 2,14,0x8\n"
" sam64\n"
" lgr 2,14\n"
" lmg 6,15,48(15)\n"
" br 14\n"
" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
" .previous\n");
static __initdata char upper_command_line[COMMAND_LINE_SIZE];
static noinline __init void create_kernel_nss(void)
{
unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
#ifdef CONFIG_BLK_DEV_INITRD
unsigned int sinitrd_pfn, einitrd_pfn;
#endif
int response;
int hlen;
size_t len;
char *savesys_ptr;
char defsys_cmd[DEFSYS_CMD_SIZE];
char savesys_cmd[SAVESYS_CMD_SIZE];
/* Do nothing if we are not running under VM */
if (!MACHINE_IS_VM)
return;
/* Convert COMMAND_LINE to upper case */
for (i = 0; i < strlen(boot_command_line); i++)
upper_command_line[i] = toupper(boot_command_line[i]);
savesys_ptr = strstr(upper_command_line, "SAVESYS=");
if (!savesys_ptr)
return;
savesys_ptr += 8; /* Point to the beginning of the NSS name */
for (i = 0; i < NSS_NAME_SIZE; i++) {
if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
break;
kernel_nss_name[i] = savesys_ptr[i];
}
stext_pfn = PFN_DOWN(__pa(&_stext));
eshared_pfn = PFN_DOWN(__pa(&_eshared));
end_pfn = PFN_UP(__pa(&_end));
min_size = end_pfn << 2;
hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
kernel_nss_name, stext_pfn - 1, stext_pfn,
eshared_pfn - 1, eshared_pfn, end_pfn);
#ifdef CONFIG_BLK_DEV_INITRD
if (INITRD_START && INITRD_SIZE) {
sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
min_size = einitrd_pfn << 2;
hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
" EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
}
#endif
snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
" EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
kernel_nss_name, kernel_nss_name);
savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
__cpcmd(defsys_cmd, NULL, 0, &response);
if (response != 0) {
pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
response);
kernel_nss_name[0] = '\0';
return;
}
len = strlen(savesys_cmd);
ASCEBC(savesys_cmd, len);
response = savesys_ipl_nss(savesys_cmd, len);
/* On success: response is equal to the command size,
* max SAVESYS_CMD_SIZE
* On error: response contains the numeric portion of cp error message.
* for SAVESYS it will be >= 263
* for missing privilege class, it will be 1
*/
if (response > SAVESYS_CMD_SIZE || response == 1) {
pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
response);
kernel_nss_name[0] = '\0';
return;
}
/* re-initialize cputime accounting. */
get_tod_clock_ext(tod_clock_base);
S390_lowcore.last_update_clock = *(__u64 *) &tod_clock_base[1];
S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
S390_lowcore.user_timer = 0;
S390_lowcore.system_timer = 0;
asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
/* re-setup boot command line with new ipl vm parms */
ipl_update_parameters();
setup_boot_command_line();
ipl_flags = IPL_NSS_VALID;
}
#else /* CONFIG_SHARED_KERNEL */
static inline void create_kernel_nss(void) { }
#endif /* CONFIG_SHARED_KERNEL */
/*
* Clear bss memory
*/
static noinline __init void clear_bss_section(void)
{
memset(__bss_start, 0, __bss_stop - __bss_start);
}
/*
* 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 = search_exception_tables(addr);
if (!fixup)
disabled_wait(0);
/* 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;
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)
{
stfle(S390_lowcore.stfle_fac_list,
ARRAY_SIZE(S390_lowcore.stfle_fac_list));
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_diag44(void)
{
int rc;
diag_stat_inc(DIAG_STAT_X044);
asm volatile(
" diag 0,0,0x44\n"
"0: la %0,0\n"
"1:\n"
EX_TABLE(0b,1b)
: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
if (!rc)
S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
}
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(40))
S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
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)) {
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 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);
static int __init noexec_setup(char *str)
{
bool enabled;
int rc;
rc = kstrtobool(str, &enabled);
if (!rc && !enabled) {
/* Disable no-execute support */
S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
__ctl_clear_bit(0, 20);
}
return rc;
}
early_param("noexec", noexec_setup);
static int __init cad_setup(char *str)
{
bool enabled;
int rc;
rc = kstrtobool(str, &enabled);
if (!rc && enabled && test_facility(128))
/* Enable problem state CAD. */
__ctl_set_bit(2, 3);
return rc;
}
early_param("cad", cad_setup);
static __init void memmove_early(void *dst, const void *src, size_t n)
{
unsigned long addr;
long incr;
psw_t old;
if (!n)
return;
incr = 1;
if (dst > src) {
incr = -incr;
dst += n - 1;
src += n - 1;
}
old = S390_lowcore.program_new_psw;
S390_lowcore.program_new_psw.mask = __extract_psw();
asm volatile(
" larl %[addr],1f\n"
" stg %[addr],%[psw_pgm_addr]\n"
"0: mvc 0(1,%[dst]),0(%[src])\n"
" agr %[dst],%[incr]\n"
" agr %[src],%[incr]\n"
" brctg %[n],0b\n"
"1:\n"
: [addr] "=&d" (addr),
[psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr),
[dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n)
: [incr] "d" (incr)
: "cc", "memory");
S390_lowcore.program_new_psw = old;
}
static __init noinline void ipl_save_parameters(void)
{
void *src, *dst;
src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
dst = (void *) IPL_PARMBLOCK_ORIGIN;
memmove_early(dst, src, PAGE_SIZE);
S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
}
static __init noinline void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
/*
* Just like in case of IPL from VM reader we make sure there is a
* gap of 4MB between end of kernel and start of initrd.
* That way we can also be sure that saving an NSS will succeed,
* which however only requires different segments.
*/
if (!INITRD_START || !INITRD_SIZE)
return;
if (INITRD_START >= min_initrd_addr)
return;
memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
INITRD_START = min_initrd_addr;
#endif
}
/* Set up boot command line */
static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
{
char *parm, *delim;
size_t rc, len;
len = strlen(boot_command_line);
delim = boot_command_line + len; /* '\0' character position */
parm = boot_command_line + len + 1; /* append right after '\0' */
rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
if (rc) {
if (*parm == '=')
memmove(boot_command_line, parm + 1, rc);
else
*delim = ' '; /* replace '\0' with space */
}
}
static inline int has_ebcdic_char(const char *str)
{
int i;
for (i = 0; str[i]; i++)
if (str[i] & 0x80)
return 1;
return 0;
}
static void __init setup_boot_command_line(void)
{
COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
/* convert arch command line to ascii if necessary */
if (has_ebcdic_char(COMMAND_LINE))
EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
/* copy arch command line */
strlcpy(boot_command_line, strstrip(COMMAND_LINE),
ARCH_COMMAND_LINE_SIZE);
/* append IPL PARM data to the boot command line */
if (MACHINE_IS_VM)
append_to_cmdline(append_ipl_vmparm);
append_to_cmdline(append_ipl_scpdata);
}
/*
* Save ipl parameters, clear bss memory, initialize storage keys
* and create a kernel NSS at startup if the SAVESYS= parm is defined
*/
void __init startup_init(void)
{
reset_tod_clock();
ipl_save_parameters();
rescue_initrd();
clear_bss_section();
ipl_verify_parameters();
time_early_init();
init_kernel_storage_key();
lockdep_off();
setup_lowcore_early();
setup_facility_list();
detect_machine_type();
setup_arch_string();
ipl_update_parameters();
setup_boot_command_line();
create_kernel_nss();
detect_diag9c();
detect_diag44();
detect_machine_facilities();
save_vector_registers();
setup_topology();
sclp_early_detect();
lockdep_on();
}