2 * arch/s390/kernel/early.c
4 * Copyright IBM Corp. 2007, 2009
5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
9 #define KMSG_COMPONENT "setup"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/compiler.h>
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/ctype.h>
17 #include <linux/ftrace.h>
18 #include <linux/lockdep.h>
19 #include <linux/module.h>
20 #include <linux/pfn.h>
21 #include <linux/uaccess.h>
22 #include <linux/kernel.h>
23 #include <asm/ebcdic.h>
25 #include <asm/lowcore.h>
26 #include <asm/processor.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/sysinfo.h>
30 #include <asm/cpcmd.h>
35 * Create a Kernel NSS if the SAVESYS= parameter is defined
37 #define DEFSYS_CMD_SIZE 128
38 #define SAVESYS_CMD_SIZE 32
40 char kernel_nss_name
[NSS_NAME_SIZE
+ 1];
42 static void __init
setup_boot_command_line(void);
45 * Get the TOD clock running.
47 static void __init
reset_tod_clock(void)
51 if (store_clock(&time
) == 0)
53 /* TOD clock not running. Set the clock to Unix Epoch. */
54 if (set_clock(TOD_UNIX_EPOCH
) != 0 || store_clock(&time
) != 0)
57 sched_clock_base_cc
= TOD_UNIX_EPOCH
;
58 S390_lowcore
.last_update_clock
= sched_clock_base_cc
;
61 #ifdef CONFIG_SHARED_KERNEL
62 int __init
savesys_ipl_nss(char *cmd
, const int cmdlen
);
65 " .section .init.text,\"ax\",@progbits\n"
67 " .type savesys_ipl_nss, @function\n"
85 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
88 static __initdata
char upper_command_line
[COMMAND_LINE_SIZE
];
90 static noinline __init
void create_kernel_nss(void)
92 unsigned int i
, stext_pfn
, eshared_pfn
, end_pfn
, min_size
;
93 #ifdef CONFIG_BLK_DEV_INITRD
94 unsigned int sinitrd_pfn
, einitrd_pfn
;
99 char defsys_cmd
[DEFSYS_CMD_SIZE
];
100 char savesys_cmd
[SAVESYS_CMD_SIZE
];
102 /* Do nothing if we are not running under VM */
106 /* Convert COMMAND_LINE to upper case */
107 for (i
= 0; i
< strlen(boot_command_line
); i
++)
108 upper_command_line
[i
] = toupper(boot_command_line
[i
]);
110 savesys_ptr
= strstr(upper_command_line
, "SAVESYS=");
115 savesys_ptr
+= 8; /* Point to the beginning of the NSS name */
116 for (i
= 0; i
< NSS_NAME_SIZE
; i
++) {
117 if (savesys_ptr
[i
] == ' ' || savesys_ptr
[i
] == '\0')
119 kernel_nss_name
[i
] = savesys_ptr
[i
];
122 stext_pfn
= PFN_DOWN(__pa(&_stext
));
123 eshared_pfn
= PFN_DOWN(__pa(&_eshared
));
124 end_pfn
= PFN_UP(__pa(&_end
));
125 min_size
= end_pfn
<< 2;
127 sprintf(defsys_cmd
, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
128 kernel_nss_name
, stext_pfn
- 1, stext_pfn
, eshared_pfn
- 1,
129 eshared_pfn
, end_pfn
);
131 #ifdef CONFIG_BLK_DEV_INITRD
132 if (INITRD_START
&& INITRD_SIZE
) {
133 sinitrd_pfn
= PFN_DOWN(__pa(INITRD_START
));
134 einitrd_pfn
= PFN_UP(__pa(INITRD_START
+ INITRD_SIZE
));
135 min_size
= einitrd_pfn
<< 2;
136 sprintf(defsys_cmd
, "%s EW %.5X-%.5X", defsys_cmd
,
137 sinitrd_pfn
, einitrd_pfn
);
141 sprintf(defsys_cmd
, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
142 defsys_cmd
, min_size
);
143 sprintf(savesys_cmd
, "SAVESYS %s \n IPL %s",
144 kernel_nss_name
, kernel_nss_name
);
146 __cpcmd(defsys_cmd
, NULL
, 0, &response
);
149 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
151 kernel_nss_name
[0] = '\0';
155 len
= strlen(savesys_cmd
);
156 ASCEBC(savesys_cmd
, len
);
157 response
= savesys_ipl_nss(savesys_cmd
, len
);
159 /* On success: response is equal to the command size,
160 * max SAVESYS_CMD_SIZE
161 * On error: response contains the numeric portion of cp error message.
162 * for SAVESYS it will be >= 263
163 * for missing privilege class, it will be 1
165 if (response
> SAVESYS_CMD_SIZE
|| response
== 1) {
166 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
168 kernel_nss_name
[0] = '\0';
172 /* re-initialize cputime accounting. */
173 sched_clock_base_cc
= get_clock();
174 S390_lowcore
.last_update_clock
= sched_clock_base_cc
;
175 S390_lowcore
.last_update_timer
= 0x7fffffffffffffffULL
;
176 S390_lowcore
.user_timer
= 0;
177 S390_lowcore
.system_timer
= 0;
178 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore
.last_update_timer
));
180 /* re-setup boot command line with new ipl vm parms */
181 ipl_update_parameters();
182 setup_boot_command_line();
184 ipl_flags
= IPL_NSS_VALID
;
187 #else /* CONFIG_SHARED_KERNEL */
189 static inline void create_kernel_nss(void) { }
191 #endif /* CONFIG_SHARED_KERNEL */
196 static noinline __init
void clear_bss_section(void)
198 memset(__bss_start
, 0, __bss_stop
- __bss_start
);
202 * Initialize storage key for kernel pages
204 static noinline __init
void init_kernel_storage_key(void)
206 unsigned long end_pfn
, init_pfn
;
208 end_pfn
= PFN_UP(__pa(&_end
));
210 for (init_pfn
= 0 ; init_pfn
< end_pfn
; init_pfn
++)
211 page_set_storage_key(init_pfn
<< PAGE_SHIFT
, PAGE_DEFAULT_KEY
);
214 static __initdata
struct sysinfo_3_2_2 vmms
__aligned(PAGE_SIZE
);
216 static noinline __init
void detect_machine_type(void)
218 /* Check current-configuration-level */
219 if ((stsi(NULL
, 0, 0, 0) >> 28) <= 2) {
220 S390_lowcore
.machine_flags
|= MACHINE_FLAG_LPAR
;
223 /* Get virtual-machine cpu information. */
224 if (stsi(&vmms
, 3, 2, 2) == -ENOSYS
|| !vmms
.count
)
227 /* Running under KVM? If not we assume z/VM */
228 if (!memcmp(vmms
.vm
[0].cpi
, "\xd2\xe5\xd4", 3))
229 S390_lowcore
.machine_flags
|= MACHINE_FLAG_KVM
;
231 S390_lowcore
.machine_flags
|= MACHINE_FLAG_VM
;
234 static __init
void early_pgm_check_handler(void)
237 const struct exception_table_entry
*fixup
;
239 addr
= S390_lowcore
.program_old_psw
.addr
;
240 fixup
= search_exception_tables(addr
& PSW_ADDR_INSN
);
243 S390_lowcore
.program_old_psw
.addr
= fixup
->fixup
| PSW_ADDR_AMODE
;
246 static noinline __init
void setup_lowcore_early(void)
250 psw
.mask
= PSW_BASE_BITS
| PSW_DEFAULT_KEY
;
251 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) s390_base_ext_handler
;
252 S390_lowcore
.external_new_psw
= psw
;
253 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) s390_base_pgm_handler
;
254 S390_lowcore
.program_new_psw
= psw
;
255 s390_base_pgm_handler_fn
= early_pgm_check_handler
;
258 static noinline __init
void setup_hpage(void)
260 #ifndef CONFIG_DEBUG_PAGEALLOC
261 unsigned int facilities
;
264 if (!(facilities
& (1UL << 23)) || !(facilities
& (1UL << 29)))
266 S390_lowcore
.machine_flags
|= MACHINE_FLAG_HPAGE
;
267 __ctl_set_bit(0, 23);
271 static __init
void detect_mvpg(void)
282 : "=d" (rc
) : "0" (-EOPNOTSUPP
), "a" (0) : "memory", "cc", "0");
284 S390_lowcore
.machine_flags
|= MACHINE_FLAG_MVPG
;
288 static __init
void detect_ieee(void)
298 : "=d" (rc
), "=d" (tmp
): "0" (-EOPNOTSUPP
) : "cc");
300 S390_lowcore
.machine_flags
|= MACHINE_FLAG_IEEE
;
304 static __init
void detect_csp(void)
317 : "=d" (rc
) : "0" (-EOPNOTSUPP
) : "cc", "0", "1", "2");
319 S390_lowcore
.machine_flags
|= MACHINE_FLAG_CSP
;
323 static __init
void detect_diag9c(void)
325 unsigned int cpu_address
;
328 cpu_address
= stap();
334 : "=d" (rc
) : "0" (-EOPNOTSUPP
), "d" (cpu_address
) : "cc");
336 S390_lowcore
.machine_flags
|= MACHINE_FLAG_DIAG9C
;
339 static __init
void detect_diag44(void)
349 : "=d" (rc
) : "0" (-EOPNOTSUPP
) : "cc");
351 S390_lowcore
.machine_flags
|= MACHINE_FLAG_DIAG44
;
355 static __init
void detect_machine_facilities(void)
358 unsigned int facilities
;
361 if (facilities
& (1 << 28))
362 S390_lowcore
.machine_flags
|= MACHINE_FLAG_IDTE
;
363 if (facilities
& (1 << 23))
364 S390_lowcore
.machine_flags
|= MACHINE_FLAG_PFMF
;
365 if (facilities
& (1 << 4))
366 S390_lowcore
.machine_flags
|= MACHINE_FLAG_MVCOS
;
370 static __init
void rescue_initrd(void)
372 #ifdef CONFIG_BLK_DEV_INITRD
374 * Move the initrd right behind the bss section in case it starts
375 * within the bss section. So we don't overwrite it when the bss
376 * section gets cleared.
378 if (!INITRD_START
|| !INITRD_SIZE
)
380 if (INITRD_START
>= (unsigned long) __bss_stop
)
382 memmove(__bss_stop
, (void *) INITRD_START
, INITRD_SIZE
);
383 INITRD_START
= (unsigned long) __bss_stop
;
387 /* Set up boot command line */
388 static void __init
append_to_cmdline(size_t (*ipl_data
)(char *, size_t))
393 len
= strlen(boot_command_line
);
395 delim
= boot_command_line
+ len
; /* '\0' character position */
396 parm
= boot_command_line
+ len
+ 1; /* append right after '\0' */
398 rc
= ipl_data(parm
, COMMAND_LINE_SIZE
- len
- 1);
401 memmove(boot_command_line
, parm
+ 1, rc
);
403 *delim
= ' '; /* replace '\0' with space */
407 static void __init
setup_boot_command_line(void)
411 /* convert arch command line to ascii */
412 for (i
= 0; i
< ARCH_COMMAND_LINE_SIZE
; i
++)
413 if (COMMAND_LINE
[i
] & 0x80)
415 if (i
< ARCH_COMMAND_LINE_SIZE
)
416 EBCASC(COMMAND_LINE
, ARCH_COMMAND_LINE_SIZE
);
417 COMMAND_LINE
[ARCH_COMMAND_LINE_SIZE
-1] = 0;
419 /* copy arch command line */
420 strlcpy(boot_command_line
, strstrip(COMMAND_LINE
),
421 ARCH_COMMAND_LINE_SIZE
);
423 /* append IPL PARM data to the boot command line */
425 append_to_cmdline(append_ipl_vmparm
);
427 append_to_cmdline(append_ipl_scpdata
);
432 * Save ipl parameters, clear bss memory, initialize storage keys
433 * and create a kernel NSS at startup if the SAVESYS= parm is defined
435 void __init
startup_init(void)
438 ipl_save_parameters();
441 init_kernel_storage_key();
445 setup_lowcore_early();
446 detect_machine_type();
447 ipl_update_parameters();
448 setup_boot_command_line();
455 detect_machine_facilities();
457 sclp_facilities_detect();
458 detect_memory_layout(memory_chunk
);
459 #ifdef CONFIG_DYNAMIC_FTRACE
460 S390_lowcore
.ftrace_func
= (unsigned long)ftrace_caller
;