2007-02-05 13:18:37 -07:00
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/*
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* arch/s390/kernel/early.c
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*
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* Copyright IBM Corp. 2007
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* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/lockdep.h>
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#include <linux/module.h>
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#include <linux/pfn.h>
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#include <linux/uaccess.h>
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2007-02-21 02:55:21 -07:00
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#include <asm/ipl.h>
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2007-02-05 13:18:37 -07:00
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#include <asm/lowcore.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/cpcmd.h>
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#include <asm/sclp.h>
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2008-04-16 23:46:26 -06:00
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#include "entry.h"
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2007-02-05 13:18:37 -07:00
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/*
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* Create a Kernel NSS if the SAVESYS= parameter is defined
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*/
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#define DEFSYS_CMD_SIZE 96
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#define SAVESYS_CMD_SIZE 32
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char kernel_nss_name[NSS_NAME_SIZE + 1];
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#ifdef CONFIG_SHARED_KERNEL
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static noinline __init void create_kernel_nss(void)
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{
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unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned int sinitrd_pfn, einitrd_pfn;
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#endif
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int response;
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char *savesys_ptr;
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char upper_command_line[COMMAND_LINE_SIZE];
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char defsys_cmd[DEFSYS_CMD_SIZE];
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char savesys_cmd[SAVESYS_CMD_SIZE];
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/* Do nothing if we are not running under VM */
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if (!MACHINE_IS_VM)
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return;
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/* Convert COMMAND_LINE to upper case */
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for (i = 0; i < strlen(COMMAND_LINE); i++)
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upper_command_line[i] = toupper(COMMAND_LINE[i]);
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savesys_ptr = strstr(upper_command_line, "SAVESYS=");
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if (!savesys_ptr)
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return;
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savesys_ptr += 8; /* Point to the beginning of the NSS name */
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for (i = 0; i < NSS_NAME_SIZE; i++) {
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if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
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break;
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kernel_nss_name[i] = savesys_ptr[i];
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}
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stext_pfn = PFN_DOWN(__pa(&_stext));
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eshared_pfn = PFN_DOWN(__pa(&_eshared));
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end_pfn = PFN_UP(__pa(&_end));
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min_size = end_pfn << 2;
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sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
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kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
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eshared_pfn, end_pfn);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (INITRD_START && INITRD_SIZE) {
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sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
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einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
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min_size = einitrd_pfn << 2;
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sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
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sinitrd_pfn, einitrd_pfn);
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}
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#endif
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sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK", defsys_cmd, min_size);
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sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
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kernel_nss_name, kernel_nss_name);
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__cpcmd(defsys_cmd, NULL, 0, &response);
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2008-03-05 04:37:16 -07:00
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if (response != 0) {
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kernel_nss_name[0] = '\0';
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2007-02-05 13:18:37 -07:00
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return;
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2008-03-05 04:37:16 -07:00
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}
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2007-02-05 13:18:37 -07:00
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__cpcmd(savesys_cmd, NULL, 0, &response);
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2008-03-05 04:37:16 -07:00
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if (response != strlen(savesys_cmd)) {
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kernel_nss_name[0] = '\0';
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2007-02-05 13:18:37 -07:00
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return;
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2008-03-05 04:37:16 -07:00
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}
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2007-02-05 13:18:37 -07:00
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ipl_flags = IPL_NSS_VALID;
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}
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#else /* CONFIG_SHARED_KERNEL */
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static inline void create_kernel_nss(void) { }
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#endif /* CONFIG_SHARED_KERNEL */
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/*
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* Clear bss memory
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*/
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static noinline __init void clear_bss_section(void)
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{
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2007-02-21 02:55:29 -07:00
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memset(__bss_start, 0, __bss_stop - __bss_start);
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2007-02-05 13:18:37 -07:00
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}
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/*
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* Initialize storage key for kernel pages
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*/
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static noinline __init void init_kernel_storage_key(void)
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{
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unsigned long end_pfn, init_pfn;
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end_pfn = PFN_UP(__pa(&_end));
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for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
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page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
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}
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static noinline __init void detect_machine_type(void)
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{
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struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
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2007-02-21 02:55:18 -07:00
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get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
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2007-02-05 13:18:37 -07:00
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/* Running under z/VM ? */
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if (cpuinfo->cpu_id.version == 0xff)
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2008-04-30 05:38:45 -06:00
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machine_flags |= MACHINE_FLAG_VM;
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2007-02-05 13:18:37 -07:00
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/* Running on a P/390 ? */
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if (cpuinfo->cpu_id.machine == 0x7490)
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2008-04-30 05:38:45 -06:00
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machine_flags |= MACHINE_FLAG_P390;
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2008-03-25 11:47:44 -06:00
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/* Running under KVM ? */
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if (cpuinfo->cpu_id.version == 0xfe)
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2008-04-30 05:38:45 -06:00
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machine_flags |= MACHINE_FLAG_KVM;
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2007-02-05 13:18:37 -07:00
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}
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2007-03-19 06:18:50 -06:00
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#ifdef CONFIG_64BIT
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2007-02-05 13:18:37 -07:00
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static noinline __init int memory_fast_detect(void)
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{
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unsigned long val0 = 0;
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unsigned long val1 = 0xc;
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int ret = -ENOSYS;
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if (ipl_flags & IPL_NSS_VALID)
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return -ENOSYS;
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asm volatile(
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" diag %1,%2,0x260\n"
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"0: lhi %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (ret), "+d" (val0), "+d" (val1) : : "cc");
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if (ret || val0 != val1)
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return -ENOSYS;
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2007-03-19 06:18:50 -06:00
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memory_chunk[0].size = val0 + 1;
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2007-02-05 13:18:37 -07:00
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return 0;
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}
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2007-03-19 06:18:50 -06:00
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#else
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static inline int memory_fast_detect(void)
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{
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return -ENOSYS;
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}
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#endif
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2007-02-05 13:18:37 -07:00
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static inline __init unsigned long __tprot(unsigned long addr)
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{
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int cc = -1;
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asm volatile(
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" tprot 0(%1),0\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (cc) : "a" (addr) : "cc");
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return (unsigned long)cc;
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}
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/* Checking memory in 128KB increments. */
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#define CHUNK_INCR (1UL << 17)
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2007-07-10 03:24:09 -06:00
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#define ADDR2G (1UL << 31)
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2007-02-05 13:18:37 -07:00
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static noinline __init void find_memory_chunks(unsigned long memsize)
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{
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unsigned long addr = 0, old_addr = 0;
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unsigned long old_cc = CHUNK_READ_WRITE;
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unsigned long cc;
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int chunk = 0;
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while (chunk < MEMORY_CHUNKS) {
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cc = __tprot(addr);
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while (cc == old_cc) {
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addr += CHUNK_INCR;
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2007-11-20 03:13:39 -07:00
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if (memsize && addr >= memsize)
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2007-11-05 03:10:11 -07:00
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break;
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2007-02-05 13:18:37 -07:00
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#ifndef CONFIG_64BIT
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if (addr == ADDR2G)
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break;
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#endif
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2007-11-05 03:10:11 -07:00
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cc = __tprot(addr);
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2007-02-05 13:18:37 -07:00
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}
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if (old_addr != addr &&
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(old_cc == CHUNK_READ_WRITE || old_cc == CHUNK_READ_ONLY)) {
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memory_chunk[chunk].addr = old_addr;
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memory_chunk[chunk].size = addr - old_addr;
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memory_chunk[chunk].type = old_cc;
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chunk++;
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}
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old_addr = addr;
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old_cc = cc;
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#ifndef CONFIG_64BIT
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if (addr == ADDR2G)
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break;
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#endif
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/*
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2007-04-27 08:01:04 -06:00
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* Finish memory detection at the first hole
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* if storage size is unknown.
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2007-02-05 13:18:37 -07:00
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*/
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2007-04-27 08:01:04 -06:00
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if (cc == -1UL && !memsize)
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2007-02-05 13:18:37 -07:00
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break;
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if (memsize && addr >= memsize)
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break;
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}
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}
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static __init void early_pgm_check_handler(void)
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{
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unsigned long addr;
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const struct exception_table_entry *fixup;
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addr = S390_lowcore.program_old_psw.addr;
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fixup = search_exception_tables(addr & PSW_ADDR_INSN);
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if (!fixup)
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disabled_wait(0);
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S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
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}
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static noinline __init void setup_lowcore_early(void)
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{
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psw_t psw;
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psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
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psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
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S390_lowcore.external_new_psw = psw;
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psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
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S390_lowcore.program_new_psw = psw;
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s390_base_pgm_handler_fn = early_pgm_check_handler;
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}
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2008-04-30 05:38:46 -06:00
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static noinline __init void setup_hpage(void)
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{
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#ifndef CONFIG_DEBUG_PAGEALLOC
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unsigned int facilities;
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facilities = stfl();
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if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
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return;
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machine_flags |= MACHINE_FLAG_HPAGE;
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__ctl_set_bit(0, 23);
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#endif
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}
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2008-04-30 05:38:45 -06:00
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static __init void detect_mvpg(void)
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{
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#ifndef CONFIG_64BIT
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int rc;
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asm volatile(
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" la 0,0\n"
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" mvpg %2,%2\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
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if (!rc)
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machine_flags |= MACHINE_FLAG_MVPG;
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#endif
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}
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static __init void detect_ieee(void)
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{
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#ifndef CONFIG_64BIT
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int rc, tmp;
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asm volatile(
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" efpc %1,0\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
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if (!rc)
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machine_flags |= MACHINE_FLAG_IEEE;
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#endif
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}
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static __init void detect_csp(void)
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{
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#ifndef CONFIG_64BIT
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int rc;
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asm volatile(
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" la 0,0\n"
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" la 1,0\n"
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" la 2,4\n"
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" csp 0,2\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
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if (!rc)
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machine_flags |= MACHINE_FLAG_CSP;
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#endif
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}
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static __init void detect_diag9c(void)
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{
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unsigned int cpu_address;
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int rc;
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cpu_address = stap();
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asm volatile(
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" diag %2,0,0x9c\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
|
|
|
|
if (!rc)
|
|
|
|
machine_flags |= MACHINE_FLAG_DIAG9C;
|
|
|
|
}
|
|
|
|
|
|
|
|
static __init void detect_diag44(void)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_64BIT
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
asm volatile(
|
|
|
|
" diag 0,0,0x44\n"
|
|
|
|
"0: la %0,0\n"
|
|
|
|
"1:\n"
|
|
|
|
EX_TABLE(0b,1b)
|
|
|
|
: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
|
|
|
|
if (!rc)
|
|
|
|
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;
|
2008-04-30 05:38:46 -06:00
|
|
|
if (facilities & (1 << 23))
|
|
|
|
machine_flags |= MACHINE_FLAG_PFMF;
|
2008-04-30 05:38:45 -06:00
|
|
|
if (facilities & (1 << 4))
|
|
|
|
machine_flags |= MACHINE_FLAG_MVCOS;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2008-07-14 01:58:55 -06:00
|
|
|
static __init void rescue_initrd(void)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
/*
|
|
|
|
* Move the initrd right behind the bss section in case it starts
|
|
|
|
* within the bss section. So we don't overwrite it when the bss
|
|
|
|
* section gets cleared.
|
|
|
|
*/
|
|
|
|
if (!INITRD_START || !INITRD_SIZE)
|
|
|
|
return;
|
|
|
|
if (INITRD_START >= (unsigned long) __bss_stop)
|
|
|
|
return;
|
|
|
|
memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
|
|
|
|
INITRD_START = (unsigned long) __bss_stop;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2007-02-05 13:18:37 -07:00
|
|
|
/*
|
|
|
|
* 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)
|
|
|
|
{
|
2007-07-10 03:24:09 -06:00
|
|
|
unsigned long long memsize;
|
2007-02-05 13:18:37 -07:00
|
|
|
|
|
|
|
ipl_save_parameters();
|
2008-07-14 01:58:55 -06:00
|
|
|
rescue_initrd();
|
2007-02-05 13:18:37 -07:00
|
|
|
clear_bss_section();
|
|
|
|
init_kernel_storage_key();
|
|
|
|
lockdep_init();
|
|
|
|
lockdep_off();
|
|
|
|
detect_machine_type();
|
|
|
|
create_kernel_nss();
|
|
|
|
sort_main_extable();
|
|
|
|
setup_lowcore_early();
|
2008-04-30 05:38:45 -06:00
|
|
|
detect_mvpg();
|
|
|
|
detect_ieee();
|
|
|
|
detect_csp();
|
|
|
|
detect_diag9c();
|
|
|
|
detect_diag44();
|
|
|
|
detect_machine_facilities();
|
2008-04-30 05:38:46 -06:00
|
|
|
setup_hpage();
|
2008-01-26 06:10:56 -07:00
|
|
|
sclp_read_info_early();
|
2007-07-10 03:24:10 -06:00
|
|
|
sclp_facilities_detect();
|
2007-02-05 13:18:37 -07:00
|
|
|
memsize = sclp_memory_detect();
|
2007-07-10 03:24:09 -06:00
|
|
|
#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;
|
|
|
|
#endif
|
2007-02-05 13:18:37 -07:00
|
|
|
if (memory_fast_detect() < 0)
|
2007-07-10 03:24:09 -06:00
|
|
|
find_memory_chunks((unsigned long) memsize);
|
2007-02-05 13:18:37 -07:00
|
|
|
lockdep_on();
|
|
|
|
}
|