2 * arch/s390/kernel/early.c
4 * Copyright IBM Corp. 2007
5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
9 #include <linux/compiler.h>
10 #include <linux/init.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/ctype.h>
14 #include <linux/lockdep.h>
15 #include <linux/module.h>
16 #include <linux/pfn.h>
17 #include <linux/uaccess.h>
18 #include <asm/ebcdic.h>
20 #include <asm/lowcore.h>
21 #include <asm/processor.h>
22 #include <asm/sections.h>
23 #include <asm/setup.h>
24 #include <asm/sysinfo.h>
25 #include <asm/cpcmd.h>
30 * Create a Kernel NSS if the SAVESYS= parameter is defined
32 #define DEFSYS_CMD_SIZE 128
33 #define SAVESYS_CMD_SIZE 32
35 char kernel_nss_name[NSS_NAME_SIZE + 1];
37 static void __init setup_boot_command_line(void);
40 #ifdef CONFIG_SHARED_KERNEL
41 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
44 " .section .init.text,\"ax\",@progbits\n"
46 " .type savesys_ipl_nss, @function\n"
64 " .size savesys_ipl_nss, .-savesys_ipl_nss\n");
66 static noinline __init void create_kernel_nss(void)
68 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
69 #ifdef CONFIG_BLK_DEV_INITRD
70 unsigned int sinitrd_pfn, einitrd_pfn;
75 char upper_command_line[COMMAND_LINE_SIZE];
76 char defsys_cmd[DEFSYS_CMD_SIZE];
77 char savesys_cmd[SAVESYS_CMD_SIZE];
79 /* Do nothing if we are not running under VM */
83 /* Convert COMMAND_LINE to upper case */
84 for (i = 0; i < strlen(boot_command_line); i++)
85 upper_command_line[i] = toupper(boot_command_line[i]);
87 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
92 savesys_ptr += 8; /* Point to the beginning of the NSS name */
93 for (i = 0; i < NSS_NAME_SIZE; i++) {
94 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
96 kernel_nss_name[i] = savesys_ptr[i];
99 stext_pfn = PFN_DOWN(__pa(&_stext));
100 eshared_pfn = PFN_DOWN(__pa(&_eshared));
101 end_pfn = PFN_UP(__pa(&_end));
102 min_size = end_pfn << 2;
104 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
105 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
106 eshared_pfn, end_pfn);
108 #ifdef CONFIG_BLK_DEV_INITRD
109 if (INITRD_START && INITRD_SIZE) {
110 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
111 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
112 min_size = einitrd_pfn << 2;
113 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
114 sinitrd_pfn, einitrd_pfn);
118 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
119 defsys_cmd, min_size);
120 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
121 kernel_nss_name, kernel_nss_name);
123 __cpcmd(defsys_cmd, NULL, 0, &response);
126 kernel_nss_name[0] = '\0';
130 len = strlen(savesys_cmd);
131 ASCEBC(savesys_cmd, len);
132 response = savesys_ipl_nss(savesys_cmd, len);
134 /* On success: response is equal to the command size,
135 * max SAVESYS_CMD_SIZE
136 * On error: response contains the numeric portion of cp error message.
137 * for SAVESYS it will be >= 263
139 if (response > SAVESYS_CMD_SIZE) {
140 kernel_nss_name[0] = '\0';
144 /* re-setup boot command line with new ipl vm parms */
145 ipl_update_parameters();
146 setup_boot_command_line();
148 ipl_flags = IPL_NSS_VALID;
151 #else /* CONFIG_SHARED_KERNEL */
153 static inline void create_kernel_nss(void) { }
155 #endif /* CONFIG_SHARED_KERNEL */
160 static noinline __init void clear_bss_section(void)
162 memset(__bss_start, 0, __bss_stop - __bss_start);
166 * Initialize storage key for kernel pages
168 static noinline __init void init_kernel_storage_key(void)
170 unsigned long end_pfn, init_pfn;
172 end_pfn = PFN_UP(__pa(&_end));
174 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
175 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
178 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
180 static noinline __init void detect_machine_type(void)
182 /* No VM information? Looks like LPAR */
183 if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
188 /* Running under KVM? If not we assume z/VM */
189 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
190 machine_flags |= MACHINE_FLAG_KVM;
192 machine_flags |= MACHINE_FLAG_VM;
195 static __init void early_pgm_check_handler(void)
198 const struct exception_table_entry *fixup;
200 addr = S390_lowcore.program_old_psw.addr;
201 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
204 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
207 static noinline __init void setup_lowcore_early(void)
211 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
212 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
213 S390_lowcore.external_new_psw = psw;
214 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
215 S390_lowcore.program_new_psw = psw;
216 s390_base_pgm_handler_fn = early_pgm_check_handler;
219 static noinline __init void setup_hpage(void)
221 #ifndef CONFIG_DEBUG_PAGEALLOC
222 unsigned int facilities;
225 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
227 machine_flags |= MACHINE_FLAG_HPAGE;
228 __ctl_set_bit(0, 23);
232 static __init void detect_mvpg(void)
243 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
245 machine_flags |= MACHINE_FLAG_MVPG;
249 static __init void detect_ieee(void)
259 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
261 machine_flags |= MACHINE_FLAG_IEEE;
265 static __init void detect_csp(void)
278 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
280 machine_flags |= MACHINE_FLAG_CSP;
284 static __init void detect_diag9c(void)
286 unsigned int cpu_address;
289 cpu_address = stap();
295 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
297 machine_flags |= MACHINE_FLAG_DIAG9C;
300 static __init void detect_diag44(void)
310 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
312 machine_flags |= MACHINE_FLAG_DIAG44;
316 static __init void detect_machine_facilities(void)
319 unsigned int facilities;
322 if (facilities & (1 << 28))
323 machine_flags |= MACHINE_FLAG_IDTE;
324 if (facilities & (1 << 23))
325 machine_flags |= MACHINE_FLAG_PFMF;
326 if (facilities & (1 << 4))
327 machine_flags |= MACHINE_FLAG_MVCOS;
331 static __init void rescue_initrd(void)
333 #ifdef CONFIG_BLK_DEV_INITRD
335 * Move the initrd right behind the bss section in case it starts
336 * within the bss section. So we don't overwrite it when the bss
337 * section gets cleared.
339 if (!INITRD_START || !INITRD_SIZE)
341 if (INITRD_START >= (unsigned long) __bss_stop)
343 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
344 INITRD_START = (unsigned long) __bss_stop;
348 /* Set up boot command line */
349 static void __init setup_boot_command_line(void)
353 /* copy arch command line */
354 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
356 /* append IPL PARM data to the boot command line */
358 parm = boot_command_line + strlen(boot_command_line);
360 get_ipl_vmparm(parm);
362 memmove(boot_command_line, parm + 1, strlen(parm));
368 * Save ipl parameters, clear bss memory, initialize storage keys
369 * and create a kernel NSS at startup if the SAVESYS= parm is defined
371 void __init startup_init(void)
373 ipl_save_parameters();
376 init_kernel_storage_key();
380 setup_lowcore_early();
381 detect_machine_type();
382 ipl_update_parameters();
383 setup_boot_command_line();
390 detect_machine_facilities();
392 sclp_facilities_detect();
393 detect_memory_layout(memory_chunk);