aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel/early.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel/early.c')
-rw-r--r--arch/s390/kernel/early.c404
1 files changed, 240 insertions, 164 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index d0e09684b9c..0dff972a169 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -1,37 +1,91 @@
/*
- * arch/s390/kernel/early.c
- *
- * Copyright IBM Corp. 2007
+ * 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/ftrace.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
+#include <linux/kernel.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 96
+#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);
+
+ sched_clock_base_cc = TOD_UNIX_EPOCH;
+ S390_lowcore.last_update_clock = sched_clock_base_cc;
+}
+
#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"
+#ifdef CONFIG_64BIT
+ " 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"
+#else
+ " stm 6,15,24(15)\n"
+ " lr 14,3\n"
+ " diag 2,14,0x8\n"
+ " lr 2,14\n"
+ " lm 6,15,24(15)\n"
+#endif
+ " 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;
@@ -39,8 +93,9 @@ static noinline __init void create_kernel_nss(void)
unsigned int sinitrd_pfn, einitrd_pfn;
#endif
int response;
+ int hlen;
+ size_t len;
char *savesys_ptr;
- char upper_command_line[COMMAND_LINE_SIZE];
char defsys_cmd[DEFSYS_CMD_SIZE];
char savesys_cmd[SAVESYS_CMD_SIZE];
@@ -49,8 +104,8 @@ static noinline __init void create_kernel_nss(void)
return;
/* Convert COMMAND_LINE to upper case */
- for (i = 0; i < strlen(COMMAND_LINE); i++)
- upper_command_line[i] = toupper(COMMAND_LINE[i]);
+ 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=");
@@ -69,38 +124,66 @@ static noinline __init void create_kernel_nss(void)
end_pfn = PFN_UP(__pa(&_end));
min_size = end_pfn << 2;
- sprintf(defsys_cmd, "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);
+ 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;
- sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
- sinitrd_pfn, einitrd_pfn);
+ hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
+ " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
}
#endif
- sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK", defsys_cmd, min_size);
- sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
- kernel_nss_name, kernel_nss_name);
+ 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;
}
- __cpcmd(savesys_cmd, NULL, 0, &response);
+ len = strlen(savesys_cmd);
+ ASCEBC(savesys_cmd, len);
+ response = savesys_ipl_nss(savesys_cmd, len);
- if (response != strlen(savesys_cmd)) {
+ /* 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. */
+ sched_clock_base_cc = get_tod_clock();
+ S390_lowcore.last_update_clock = sched_clock_base_cc;
+ 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;
}
@@ -123,144 +206,78 @@ static noinline __init void clear_bss_section(void)
*/
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);
-}
-
-static noinline __init void detect_machine_type(void)
-{
- struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
-
- get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
-
- /* Running under z/VM ? */
- if (cpuinfo->cpu_id.version == 0xff)
- machine_flags |= MACHINE_FLAG_VM;
-
- /* Running on a P/390 ? */
- if (cpuinfo->cpu_id.machine == 0x7490)
- machine_flags |= MACHINE_FLAG_P390;
-
- /* Running under KVM ? */
- if (cpuinfo->cpu_id.version == 0xfe)
- machine_flags |= MACHINE_FLAG_KVM;
+ page_set_storage_key(init_pfn << PAGE_SHIFT,
+ PAGE_DEFAULT_KEY, 0);
+#endif
}
-#ifdef CONFIG_64BIT
-static noinline __init int memory_fast_detect(void)
-{
- unsigned long val0 = 0;
- unsigned long val1 = 0xc;
- int ret = -ENOSYS;
-
- if (ipl_flags & IPL_NSS_VALID)
- return -ENOSYS;
-
- asm volatile(
- " diag %1,%2,0x260\n"
- "0: lhi %0,0\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+d" (ret), "+d" (val0), "+d" (val1) : : "cc");
-
- if (ret || val0 != val1)
- return -ENOSYS;
+static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
- memory_chunk[0].size = val0 + 1;
- return 0;
-}
-#else
-static inline int memory_fast_detect(void)
+static noinline __init void detect_machine_type(void)
{
- return -ENOSYS;
-}
-#endif
+ struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
-static inline __init unsigned long __tprot(unsigned long addr)
-{
- int cc = -1;
+ /* 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;
- asm volatile(
- " tprot 0(%1),0\n"
- "0: ipm %0\n"
- " srl %0,28\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+d" (cc) : "a" (addr) : "cc");
- return (unsigned long)cc;
+ /* Running under KVM? If not we assume z/VM */
+ if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
+ S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
+ else
+ S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
}
-/* Checking memory in 128KB increments. */
-#define CHUNK_INCR (1UL << 17)
-#define ADDR2G (1UL << 31)
-
-static noinline __init void find_memory_chunks(unsigned long memsize)
+static __init void setup_topology(void)
{
- unsigned long addr = 0, old_addr = 0;
- unsigned long old_cc = CHUNK_READ_WRITE;
- unsigned long cc;
- int chunk = 0;
-
- while (chunk < MEMORY_CHUNKS) {
- cc = __tprot(addr);
- while (cc == old_cc) {
- addr += CHUNK_INCR;
- if (memsize && addr >= memsize)
- break;
-#ifndef CONFIG_64BIT
- if (addr == ADDR2G)
- break;
-#endif
- cc = __tprot(addr);
- }
-
- if (old_addr != addr &&
- (old_cc == CHUNK_READ_WRITE || old_cc == CHUNK_READ_ONLY)) {
- memory_chunk[chunk].addr = old_addr;
- memory_chunk[chunk].size = addr - old_addr;
- memory_chunk[chunk].type = old_cc;
- chunk++;
- }
-
- old_addr = addr;
- old_cc = cc;
+#ifdef CONFIG_64BIT
+ int max_mnest;
-#ifndef CONFIG_64BIT
- if (addr == ADDR2G)
- break;
-#endif
- /*
- * Finish memory detection at the first hole
- * if storage size is unknown.
- */
- if (cc == -1UL && !memsize)
- break;
- if (memsize && addr >= memsize)
+ 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;
+#endif
}
-static __init void early_pgm_check_handler(void)
+static void early_pgm_check_handler(void)
{
- unsigned long addr;
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 & PSW_ADDR_INSN);
if (!fixup)
disabled_wait(0);
- S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
+ /* 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)|PSW_ADDR_AMODE;
+ __ctl_load(cr0, 0, 0);
}
static noinline __init void setup_lowcore_early(void)
{
psw_t psw;
- psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
S390_lowcore.external_new_psw = psw;
psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
@@ -268,17 +285,10 @@ static noinline __init void setup_lowcore_early(void)
s390_base_pgm_handler_fn = early_pgm_check_handler;
}
-static noinline __init void setup_hpage(void)
+static noinline __init void setup_facility_list(void)
{
-#ifndef CONFIG_DEBUG_PAGEALLOC
- unsigned int facilities;
-
- facilities = stfl();
- if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
- return;
- machine_flags |= MACHINE_FLAG_HPAGE;
- __ctl_set_bit(0, 23);
-#endif
+ stfle(S390_lowcore.stfle_fac_list,
+ ARRAY_SIZE(S390_lowcore.stfle_fac_list));
}
static __init void detect_mvpg(void)
@@ -294,7 +304,7 @@ static __init void detect_mvpg(void)
EX_TABLE(0b,1b)
: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
if (!rc)
- machine_flags |= MACHINE_FLAG_MVPG;
+ S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
#endif
}
@@ -310,7 +320,7 @@ static __init void detect_ieee(void)
EX_TABLE(0b,1b)
: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
if (!rc)
- machine_flags |= MACHINE_FLAG_IEEE;
+ S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
#endif
}
@@ -329,7 +339,7 @@ static __init void detect_csp(void)
EX_TABLE(0b,1b)
: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
if (!rc)
- machine_flags |= MACHINE_FLAG_CSP;
+ S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
#endif
}
@@ -346,7 +356,7 @@ static __init void detect_diag9c(void)
EX_TABLE(0b,1b)
: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
if (!rc)
- machine_flags |= MACHINE_FLAG_DIAG9C;
+ S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
}
static __init void detect_diag44(void)
@@ -361,61 +371,127 @@ static __init void detect_diag44(void)
EX_TABLE(0b,1b)
: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
if (!rc)
- machine_flags |= MACHINE_FLAG_DIAG44;
+ S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
#endif
}
static __init void detect_machine_facilities(void)
{
#ifdef CONFIG_64BIT
- unsigned int facilities;
-
- facilities = stfl();
- if (facilities & (1 << 28))
- machine_flags |= MACHINE_FLAG_IDTE;
- if (facilities & (1 << 23))
- machine_flags |= MACHINE_FLAG_PFMF;
- if (facilities & (1 << 4))
- machine_flags |= MACHINE_FLAG_MVCOS;
+ 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;
+ if (test_facility(66))
+ S390_lowcore.machine_flags |= MACHINE_FLAG_RRBM;
+ if (test_facility(51))
+ S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
#endif
}
+static __init 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((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)
{
- unsigned long long memsize;
-
+ reset_tod_clock();
ipl_save_parameters();
+ rescue_initrd();
clear_bss_section();
init_kernel_storage_key();
lockdep_init();
lockdep_off();
+ setup_lowcore_early();
+ setup_facility_list();
detect_machine_type();
+ ipl_update_parameters();
+ setup_boot_command_line();
create_kernel_nss();
- sort_main_extable();
- setup_lowcore_early();
detect_mvpg();
detect_ieee();
detect_csp();
detect_diag9c();
detect_diag44();
detect_machine_facilities();
- setup_hpage();
- sclp_read_info_early();
- sclp_facilities_detect();
- memsize = sclp_memory_detect();
-#ifndef CONFIG_64BIT
- /*
- * Can't deal with more than 2G in 31 bit addressing mode, so
- * limit the value in order to avoid strange side effects.
- */
- if (memsize > ADDR2G)
- memsize = ADDR2G;
+ setup_topology();
+ sclp_early_detect();
+#ifdef CONFIG_DYNAMIC_FTRACE
+ S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
#endif
- if (memory_fast_detect() < 0)
- find_memory_chunks((unsigned long) memsize);
lockdep_on();
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-14 13:51:20 +0000