]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/s390/kernel/early.c
2 * Copyright IBM Corp. 2007, 2009
3 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
4 * Heiko Carstens <heiko.carstens@de.ibm.com>
7 #define KMSG_COMPONENT "setup"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10 #include <linux/compiler.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/ctype.h>
15 #include <linux/ftrace.h>
16 #include <linux/lockdep.h>
17 #include <linux/module.h>
18 #include <linux/pfn.h>
19 #include <linux/uaccess.h>
20 #include <linux/kernel.h>
21 #include <asm/ebcdic.h>
23 #include <asm/lowcore.h>
24 #include <asm/processor.h>
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sysinfo.h>
28 #include <asm/cpcmd.h>
30 #include <asm/facility.h>
34 * Create a Kernel NSS if the SAVESYS= parameter is defined
36 #define DEFSYS_CMD_SIZE 128
37 #define SAVESYS_CMD_SIZE 32
39 char kernel_nss_name
[NSS_NAME_SIZE
+ 1];
41 static void __init
setup_boot_command_line(void);
44 * Get the TOD clock running.
46 static void __init
reset_tod_clock(void)
50 if (store_clock(&time
) == 0)
52 /* TOD clock not running. Set the clock to Unix Epoch. */
53 if (set_clock(TOD_UNIX_EPOCH
) != 0 || store_clock(&time
) != 0)
56 sched_clock_base_cc
= TOD_UNIX_EPOCH
;
57 S390_lowcore
.last_update_clock
= sched_clock_base_cc
;
60 #ifdef CONFIG_SHARED_KERNEL
61 int __init
savesys_ipl_nss(char *cmd
, const int cmdlen
);
64 " .section .init.text,\"ax\",@progbits\n"
66 " .type savesys_ipl_nss, @function\n"
84 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
87 static __initdata
char upper_command_line
[COMMAND_LINE_SIZE
];
89 static noinline __init
void create_kernel_nss(void)
91 unsigned int i
, stext_pfn
, eshared_pfn
, end_pfn
, min_size
;
92 #ifdef CONFIG_BLK_DEV_INITRD
93 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 hlen
= snprintf(defsys_cmd
, DEFSYS_CMD_SIZE
,
128 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
129 kernel_nss_name
, stext_pfn
- 1, stext_pfn
,
130 eshared_pfn
- 1, eshared_pfn
, end_pfn
);
132 #ifdef CONFIG_BLK_DEV_INITRD
133 if (INITRD_START
&& INITRD_SIZE
) {
134 sinitrd_pfn
= PFN_DOWN(__pa(INITRD_START
));
135 einitrd_pfn
= PFN_UP(__pa(INITRD_START
+ INITRD_SIZE
));
136 min_size
= einitrd_pfn
<< 2;
137 hlen
+= snprintf(defsys_cmd
+ hlen
, DEFSYS_CMD_SIZE
- hlen
,
138 " EW %.5X-%.5X", sinitrd_pfn
, einitrd_pfn
);
142 snprintf(defsys_cmd
+ hlen
, DEFSYS_CMD_SIZE
- hlen
,
143 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size
);
144 defsys_cmd
[DEFSYS_CMD_SIZE
- 1] = '\0';
145 snprintf(savesys_cmd
, SAVESYS_CMD_SIZE
, "SAVESYS %s \n IPL %s",
146 kernel_nss_name
, kernel_nss_name
);
147 savesys_cmd
[SAVESYS_CMD_SIZE
- 1] = '\0';
149 __cpcmd(defsys_cmd
, NULL
, 0, &response
);
152 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
154 kernel_nss_name
[0] = '\0';
158 len
= strlen(savesys_cmd
);
159 ASCEBC(savesys_cmd
, len
);
160 response
= savesys_ipl_nss(savesys_cmd
, len
);
162 /* On success: response is equal to the command size,
163 * max SAVESYS_CMD_SIZE
164 * On error: response contains the numeric portion of cp error message.
165 * for SAVESYS it will be >= 263
166 * for missing privilege class, it will be 1
168 if (response
> SAVESYS_CMD_SIZE
|| response
== 1) {
169 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
171 kernel_nss_name
[0] = '\0';
175 /* re-initialize cputime accounting. */
176 sched_clock_base_cc
= get_clock();
177 S390_lowcore
.last_update_clock
= sched_clock_base_cc
;
178 S390_lowcore
.last_update_timer
= 0x7fffffffffffffffULL
;
179 S390_lowcore
.user_timer
= 0;
180 S390_lowcore
.system_timer
= 0;
181 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore
.last_update_timer
));
183 /* re-setup boot command line with new ipl vm parms */
184 ipl_update_parameters();
185 setup_boot_command_line();
187 ipl_flags
= IPL_NSS_VALID
;
190 #else /* CONFIG_SHARED_KERNEL */
192 static inline void create_kernel_nss(void) { }
194 #endif /* CONFIG_SHARED_KERNEL */
199 static noinline __init
void clear_bss_section(void)
201 memset(__bss_start
, 0, __bss_stop
- __bss_start
);
205 * Initialize storage key for kernel pages
207 static noinline __init
void init_kernel_storage_key(void)
209 unsigned long end_pfn
, init_pfn
;
211 end_pfn
= PFN_UP(__pa(&_end
));
213 for (init_pfn
= 0 ; init_pfn
< end_pfn
; init_pfn
++)
214 page_set_storage_key(init_pfn
<< PAGE_SHIFT
,
215 PAGE_DEFAULT_KEY
, 0);
218 static __initdata
struct sysinfo_3_2_2 vmms
__aligned(PAGE_SIZE
);
220 static noinline __init
void detect_machine_type(void)
222 /* Check current-configuration-level */
223 if ((stsi(NULL
, 0, 0, 0) >> 28) <= 2) {
224 S390_lowcore
.machine_flags
|= MACHINE_FLAG_LPAR
;
227 /* Get virtual-machine cpu information. */
228 if (stsi(&vmms
, 3, 2, 2) == -ENOSYS
|| !vmms
.count
)
231 /* Running under KVM? If not we assume z/VM */
232 if (!memcmp(vmms
.vm
[0].cpi
, "\xd2\xe5\xd4", 3))
233 S390_lowcore
.machine_flags
|= MACHINE_FLAG_KVM
;
235 S390_lowcore
.machine_flags
|= MACHINE_FLAG_VM
;
238 static void early_pgm_check_handler(void)
241 const struct exception_table_entry
*fixup
;
243 addr
= S390_lowcore
.program_old_psw
.addr
;
244 fixup
= search_exception_tables(addr
& PSW_ADDR_INSN
);
247 S390_lowcore
.program_old_psw
.addr
= fixup
->fixup
| PSW_ADDR_AMODE
;
250 static noinline __init
void setup_lowcore_early(void)
254 psw
.mask
= PSW_MASK_BASE
| PSW_DEFAULT_KEY
| PSW_MASK_EA
| PSW_MASK_BA
;
255 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) s390_base_ext_handler
;
256 S390_lowcore
.external_new_psw
= psw
;
257 psw
.addr
= PSW_ADDR_AMODE
| (unsigned long) s390_base_pgm_handler
;
258 S390_lowcore
.program_new_psw
= psw
;
259 s390_base_pgm_handler_fn
= early_pgm_check_handler
;
262 static noinline __init
void setup_facility_list(void)
264 stfle(S390_lowcore
.stfle_fac_list
,
265 ARRAY_SIZE(S390_lowcore
.stfle_fac_list
));
268 static noinline __init
void setup_hpage(void)
270 #ifndef CONFIG_DEBUG_PAGEALLOC
271 if (!test_facility(2) || !test_facility(8))
273 S390_lowcore
.machine_flags
|= MACHINE_FLAG_HPAGE
;
274 __ctl_set_bit(0, 23);
278 static __init
void detect_mvpg(void)
289 : "=d" (rc
) : "0" (-EOPNOTSUPP
), "a" (0) : "memory", "cc", "0");
291 S390_lowcore
.machine_flags
|= MACHINE_FLAG_MVPG
;
295 static __init
void detect_ieee(void)
305 : "=d" (rc
), "=d" (tmp
): "0" (-EOPNOTSUPP
) : "cc");
307 S390_lowcore
.machine_flags
|= MACHINE_FLAG_IEEE
;
311 static __init
void detect_csp(void)
324 : "=d" (rc
) : "0" (-EOPNOTSUPP
) : "cc", "0", "1", "2");
326 S390_lowcore
.machine_flags
|= MACHINE_FLAG_CSP
;
330 static __init
void detect_diag9c(void)
332 unsigned int cpu_address
;
335 cpu_address
= stap();
341 : "=d" (rc
) : "0" (-EOPNOTSUPP
), "d" (cpu_address
) : "cc");
343 S390_lowcore
.machine_flags
|= MACHINE_FLAG_DIAG9C
;
346 static __init
void detect_diag44(void)
356 : "=d" (rc
) : "0" (-EOPNOTSUPP
) : "cc");
358 S390_lowcore
.machine_flags
|= MACHINE_FLAG_DIAG44
;
362 static __init
void detect_machine_facilities(void)
365 if (test_facility(3))
366 S390_lowcore
.machine_flags
|= MACHINE_FLAG_IDTE
;
367 if (test_facility(8))
368 S390_lowcore
.machine_flags
|= MACHINE_FLAG_PFMF
;
369 if (test_facility(11))
370 S390_lowcore
.machine_flags
|= MACHINE_FLAG_TOPOLOGY
;
371 if (test_facility(27))
372 S390_lowcore
.machine_flags
|= MACHINE_FLAG_MVCOS
;
373 if (test_facility(40))
374 S390_lowcore
.machine_flags
|= MACHINE_FLAG_SPP
;
378 static __init
void rescue_initrd(void)
380 #ifdef CONFIG_BLK_DEV_INITRD
381 unsigned long min_initrd_addr
= (unsigned long) _end
+ (4UL << 20);
383 * Just like in case of IPL from VM reader we make sure there is a
384 * gap of 4MB between end of kernel and start of initrd.
385 * That way we can also be sure that saving an NSS will succeed,
386 * which however only requires different segments.
388 if (!INITRD_START
|| !INITRD_SIZE
)
390 if (INITRD_START
>= min_initrd_addr
)
392 memmove((void *) min_initrd_addr
, (void *) INITRD_START
, INITRD_SIZE
);
393 INITRD_START
= min_initrd_addr
;
397 /* Set up boot command line */
398 static void __init
append_to_cmdline(size_t (*ipl_data
)(char *, size_t))
403 len
= strlen(boot_command_line
);
405 delim
= boot_command_line
+ len
; /* '\0' character position */
406 parm
= boot_command_line
+ len
+ 1; /* append right after '\0' */
408 rc
= ipl_data(parm
, COMMAND_LINE_SIZE
- len
- 1);
411 memmove(boot_command_line
, parm
+ 1, rc
);
413 *delim
= ' '; /* replace '\0' with space */
417 static inline int has_ebcdic_char(const char *str
)
421 for (i
= 0; str
[i
]; i
++)
427 static void __init
setup_boot_command_line(void)
429 COMMAND_LINE
[ARCH_COMMAND_LINE_SIZE
- 1] = 0;
430 /* convert arch command line to ascii if necessary */
431 if (has_ebcdic_char(COMMAND_LINE
))
432 EBCASC(COMMAND_LINE
, ARCH_COMMAND_LINE_SIZE
);
433 /* copy arch command line */
434 strlcpy(boot_command_line
, strstrip(COMMAND_LINE
),
435 ARCH_COMMAND_LINE_SIZE
);
437 /* append IPL PARM data to the boot command line */
439 append_to_cmdline(append_ipl_vmparm
);
441 append_to_cmdline(append_ipl_scpdata
);
446 * Save ipl parameters, clear bss memory, initialize storage keys
447 * and create a kernel NSS at startup if the SAVESYS= parm is defined
449 void __init
startup_init(void)
452 ipl_save_parameters();
455 init_kernel_storage_key();
459 setup_lowcore_early();
460 setup_facility_list();
461 detect_machine_type();
462 ipl_update_parameters();
463 setup_boot_command_line();
470 detect_machine_facilities();
472 sclp_facilities_detect();
473 detect_memory_layout(memory_chunk
);
474 #ifdef CONFIG_DYNAMIC_FTRACE
475 S390_lowcore
.ftrace_func
= (unsigned long)ftrace_caller
;