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>
32 #include <asm/facility.h>
36 * Create a Kernel NSS if the SAVESYS= parameter is defined
38 #define DEFSYS_CMD_SIZE 128
39 #define SAVESYS_CMD_SIZE 32
41 char kernel_nss_name
[NSS_NAME_SIZE
+ 1];
43 static void __init
setup_boot_command_line(void);
46 * Get the TOD clock running.
48 static void __init
reset_tod_clock(void)
52 if (store_clock(&time
) == 0)
54 /* TOD clock not running. Set the clock to Unix Epoch. */
55 if (set_clock(TOD_UNIX_EPOCH
) != 0 || store_clock(&time
) != 0)
58 sched_clock_base_cc
= TOD_UNIX_EPOCH
;
59 S390_lowcore
.last_update_clock
= sched_clock_base_cc
;
62 #ifdef CONFIG_SHARED_KERNEL
63 int __init
savesys_ipl_nss(char *cmd
, const int cmdlen
);
66 " .section .init.text,\"ax\",@progbits\n"
68 " .type savesys_ipl_nss, @function\n"
86 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
89 static __initdata
char upper_command_line
[COMMAND_LINE_SIZE
];
91 static noinline __init
void create_kernel_nss(void)
93 unsigned int i
, stext_pfn
, eshared_pfn
, end_pfn
, min_size
;
94 #ifdef CONFIG_BLK_DEV_INITRD
95 unsigned int sinitrd_pfn
, einitrd_pfn
;
101 char defsys_cmd
[DEFSYS_CMD_SIZE
];
102 char savesys_cmd
[SAVESYS_CMD_SIZE
];
104 /* Do nothing if we are not running under VM */
108 /* Convert COMMAND_LINE to upper case */
109 for (i
= 0; i
< strlen(boot_command_line
); i
++)
110 upper_command_line
[i
] = toupper(boot_command_line
[i
]);
112 savesys_ptr
= strstr(upper_command_line
, "SAVESYS=");
117 savesys_ptr
+= 8; /* Point to the beginning of the NSS name */
118 for (i
= 0; i
< NSS_NAME_SIZE
; i
++) {
119 if (savesys_ptr
[i
] == ' ' || savesys_ptr
[i
] == '\0')
121 kernel_nss_name
[i
] = savesys_ptr
[i
];
124 stext_pfn
= PFN_DOWN(__pa(&_stext
));
125 eshared_pfn
= PFN_DOWN(__pa(&_eshared
));
126 end_pfn
= PFN_UP(__pa(&_end
));
127 min_size
= end_pfn
<< 2;
129 hlen
= snprintf(defsys_cmd
, DEFSYS_CMD_SIZE
,
130 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
131 kernel_nss_name
, stext_pfn
- 1, stext_pfn
,
132 eshared_pfn
- 1, eshared_pfn
, end_pfn
);
134 #ifdef CONFIG_BLK_DEV_INITRD
135 if (INITRD_START
&& INITRD_SIZE
) {
136 sinitrd_pfn
= PFN_DOWN(__pa(INITRD_START
));
137 einitrd_pfn
= PFN_UP(__pa(INITRD_START
+ INITRD_SIZE
));
138 min_size
= einitrd_pfn
<< 2;
139 hlen
+= snprintf(defsys_cmd
+ hlen
, DEFSYS_CMD_SIZE
- hlen
,
140 " EW %.5X-%.5X", sinitrd_pfn
, einitrd_pfn
);
144 snprintf(defsys_cmd
+ hlen
, DEFSYS_CMD_SIZE
- hlen
,
145 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size
);
146 defsys_cmd
[DEFSYS_CMD_SIZE
- 1] = '\0';
147 snprintf(savesys_cmd
, SAVESYS_CMD_SIZE
, "SAVESYS %s \n IPL %s",
148 kernel_nss_name
, kernel_nss_name
);
149 savesys_cmd
[SAVESYS_CMD_SIZE
- 1] = '\0';
151 __cpcmd(defsys_cmd
, NULL
, 0, &response
);
154 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
156 kernel_nss_name
[0] = '\0';
160 len
= strlen(savesys_cmd
);
161 ASCEBC(savesys_cmd
, len
);
162 response
= savesys_ipl_nss(savesys_cmd
, len
);
164 /* On success: response is equal to the command size,
165 * max SAVESYS_CMD_SIZE
166 * On error: response contains the numeric portion of cp error message.
167 * for SAVESYS it will be >= 263
168 * for missing privilege class, it will be 1
170 if (response
> SAVESYS_CMD_SIZE
|| response
== 1) {
171 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
173 kernel_nss_name
[0] = '\0';
177 /* re-initialize cputime accounting. */
178 sched_clock_base_cc
= get_clock();
179 S390_lowcore
.last_update_clock
= sched_clock_base_cc
;
180 S390_lowcore
.last_update_timer
= 0x7fffffffffffffffULL
;
181 S390_lowcore
.user_timer
= 0;
182 S390_lowcore
.system_timer
= 0;
183 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore
.last_update_timer
));
185 /* re-setup boot command line with new ipl vm parms */
186 ipl_update_parameters();
187 setup_boot_command_line();
189 ipl_flags
= IPL_NSS_VALID
;
192 #else /* CONFIG_SHARED_KERNEL */
194 static inline void create_kernel_nss(void) { }
196 #endif /* CONFIG_SHARED_KERNEL */
201 static noinline __init
void clear_bss_section(void)
203 memset(__bss_start
, 0, __bss_stop
- __bss_start
);
207 * Initialize storage key for kernel pages
209 static noinline __init
void init_kernel_storage_key(void)
211 unsigned long end_pfn
, init_pfn
;
213 end_pfn
= PFN_UP(__pa(&_end
));
215 for (init_pfn
= 0 ; init_pfn
< end_pfn
; init_pfn
++)
216 page_set_storage_key(init_pfn
<< PAGE_SHIFT
,
217 PAGE_DEFAULT_KEY
, 0);
220 static __initdata
struct sysinfo_3_2_2 vmms
__aligned(PAGE_SIZE
);
222 static noinline __init
void detect_machine_type(void)
224 /* Check current-configuration-level */
225 if ((stsi(NULL
, 0, 0, 0) >> 28) <= 2) {
226 S390_lowcore
.machine_flags
|= MACHINE_FLAG_LPAR
;
229 /* Get virtual-machine cpu information. */
230 if (stsi(&vmms
, 3, 2, 2) == -ENOSYS
|| !vmms
.count
)
233 /* Running under KVM? If not we assume z/VM */
234 if (!memcmp(vmms
.vm
[0].cpi
, "\xd2\xe5\xd4", 3))
235 S390_lowcore
.machine_flags
|= MACHINE_FLAG_KVM
;
237 S390_lowcore
.machine_flags
|= MACHINE_FLAG_VM
;
240 static __init
void early_pgm_check_handler(void)
243 const struct exception_table_entry
*fixup
;
245 addr
= S390_lowcore
.program_old_psw
.addr
;
246 fixup
= search_exception_tables(addr
& PSW_ADDR_INSN
);
249 S390_lowcore
.program_old_psw
.addr
= fixup
->fixup
| PSW_ADDR_AMODE
;
252 static noinline __init
void setup_lowcore_early(void)
256 psw
.mask
= PSW_MASK_BASE
| PSW_DEFAULT_KEY
| PSW_MASK_EA
| PSW_MASK_BA
;
257 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) s390_base_ext_handler
;
258 S390_lowcore
.external_new_psw
= psw
;
259 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) s390_base_pgm_handler
;
260 S390_lowcore
.program_new_psw
= psw
;
261 s390_base_pgm_handler_fn
= early_pgm_check_handler
;
264 static noinline __init
void setup_facility_list(void)
266 stfle(S390_lowcore
.stfle_fac_list
,
267 ARRAY_SIZE(S390_lowcore
.stfle_fac_list
));
270 static noinline __init
void setup_hpage(void)
272 #ifndef CONFIG_DEBUG_PAGEALLOC
273 if (!test_facility(2) || !test_facility(8))
275 S390_lowcore
.machine_flags
|= MACHINE_FLAG_HPAGE
;
276 __ctl_set_bit(0, 23);
280 static __init
void detect_mvpg(void)
291 : "=d" (rc
) : "0" (-EOPNOTSUPP
), "a" (0) : "memory", "cc", "0");
293 S390_lowcore
.machine_flags
|= MACHINE_FLAG_MVPG
;
297 static __init
void detect_ieee(void)
307 : "=d" (rc
), "=d" (tmp
): "0" (-EOPNOTSUPP
) : "cc");
309 S390_lowcore
.machine_flags
|= MACHINE_FLAG_IEEE
;
313 static __init
void detect_csp(void)
326 : "=d" (rc
) : "0" (-EOPNOTSUPP
) : "cc", "0", "1", "2");
328 S390_lowcore
.machine_flags
|= MACHINE_FLAG_CSP
;
332 static __init
void detect_diag9c(void)
334 unsigned int cpu_address
;
337 cpu_address
= stap();
343 : "=d" (rc
) : "0" (-EOPNOTSUPP
), "d" (cpu_address
) : "cc");
345 S390_lowcore
.machine_flags
|= MACHINE_FLAG_DIAG9C
;
348 static __init
void detect_diag44(void)
358 : "=d" (rc
) : "0" (-EOPNOTSUPP
) : "cc");
360 S390_lowcore
.machine_flags
|= MACHINE_FLAG_DIAG44
;
364 static __init
void detect_machine_facilities(void)
367 if (test_facility(3))
368 S390_lowcore
.machine_flags
|= MACHINE_FLAG_IDTE
;
369 if (test_facility(8))
370 S390_lowcore
.machine_flags
|= MACHINE_FLAG_PFMF
;
371 if (test_facility(11))
372 S390_lowcore
.machine_flags
|= MACHINE_FLAG_TOPOLOGY
;
373 if (test_facility(27))
374 S390_lowcore
.machine_flags
|= MACHINE_FLAG_MVCOS
;
375 if (test_facility(40))
376 S390_lowcore
.machine_flags
|= MACHINE_FLAG_SPP
;
377 if (test_facility(25))
378 S390_lowcore
.machine_flags
|= MACHINE_FLAG_STCKF
;
382 static __init
void rescue_initrd(void)
384 #ifdef CONFIG_BLK_DEV_INITRD
385 unsigned long min_initrd_addr
= (unsigned long) _end
+ (4UL << 20);
387 * Just like in case of IPL from VM reader we make sure there is a
388 * gap of 4MB between end of kernel and start of initrd.
389 * That way we can also be sure that saving an NSS will succeed,
390 * which however only requires different segments.
392 if (!INITRD_START
|| !INITRD_SIZE
)
394 if (INITRD_START
>= min_initrd_addr
)
396 memmove((void *) min_initrd_addr
, (void *) INITRD_START
, INITRD_SIZE
);
397 INITRD_START
= min_initrd_addr
;
401 /* Set up boot command line */
402 static void __init
append_to_cmdline(size_t (*ipl_data
)(char *, size_t))
407 len
= strlen(boot_command_line
);
409 delim
= boot_command_line
+ len
; /* '\0' character position */
410 parm
= boot_command_line
+ len
+ 1; /* append right after '\0' */
412 rc
= ipl_data(parm
, COMMAND_LINE_SIZE
- len
- 1);
415 memmove(boot_command_line
, parm
+ 1, rc
);
417 *delim
= ' '; /* replace '\0' with space */
421 static inline int has_ebcdic_char(const char *str
)
425 for (i
= 0; str
[i
]; i
++)
431 static void __init
setup_boot_command_line(void)
433 COMMAND_LINE
[ARCH_COMMAND_LINE_SIZE
- 1] = 0;
434 /* convert arch command line to ascii if necessary */
435 if (has_ebcdic_char(COMMAND_LINE
))
436 EBCASC(COMMAND_LINE
, ARCH_COMMAND_LINE_SIZE
);
437 /* copy arch command line */
438 strlcpy(boot_command_line
, strstrip(COMMAND_LINE
),
439 ARCH_COMMAND_LINE_SIZE
);
441 /* append IPL PARM data to the boot command line */
443 append_to_cmdline(append_ipl_vmparm
);
445 append_to_cmdline(append_ipl_scpdata
);
450 * Save ipl parameters, clear bss memory, initialize storage keys
451 * and create a kernel NSS at startup if the SAVESYS= parm is defined
453 void __init
startup_init(void)
456 ipl_save_parameters();
459 init_kernel_storage_key();
463 setup_lowcore_early();
464 setup_facility_list();
465 detect_machine_type();
466 ipl_update_parameters();
467 setup_boot_command_line();
474 detect_machine_facilities();
476 sclp_facilities_detect();
477 detect_memory_layout(memory_chunk
);
478 #ifdef CONFIG_DYNAMIC_FTRACE
479 S390_lowcore
.ftrace_func
= (unsigned long)ftrace_caller
;
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