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early.c

/*
 *  arch/s390/kernel/early.c
 *
 *    Copyright IBM Corp. 2007
 *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
 *           Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/pfn.h>
#include <linux/uaccess.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/cpcmd.h>
#include <asm/sclp.h>
#include "entry.h"

/*
 * Create a Kernel NSS if the SAVESYS= parameter is defined
 */
#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);


#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");

static noinline __init void create_kernel_nss(void)
{
      unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
#ifdef CONFIG_BLK_DEV_INITRD
      unsigned int sinitrd_pfn, einitrd_pfn;
#endif
      int response;
      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];

      /* Do nothing if we are not running under VM */
      if (!MACHINE_IS_VM)
            return;

      /* Convert COMMAND_LINE to upper case */
      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=");

      if (!savesys_ptr)
            return;

      savesys_ptr += 8;    /* Point to the beginning of the NSS name */
      for (i = 0; i < NSS_NAME_SIZE; i++) {
            if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
                  break;
            kernel_nss_name[i] = savesys_ptr[i];
      }

      stext_pfn = PFN_DOWN(__pa(&_stext));
      eshared_pfn = PFN_DOWN(__pa(&_eshared));
      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);

#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);
      }
#endif

      sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
            defsys_cmd, min_size);
      sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
            kernel_nss_name, kernel_nss_name);

      __cpcmd(defsys_cmd, NULL, 0, &response);

      if (response != 0) {
            kernel_nss_name[0] = '\0';
            return;
      }

      len = strlen(savesys_cmd);
      ASCEBC(savesys_cmd, len);
      response = savesys_ipl_nss(savesys_cmd, len);

      /* 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
       */
      if (response > SAVESYS_CMD_SIZE) {
            kernel_nss_name[0] = '\0';
            return;
      }

      /* re-setup boot command line with new ipl vm parms */
      ipl_update_parameters();
      setup_boot_command_line();

      ipl_flags = IPL_NSS_VALID;
}

#else /* CONFIG_SHARED_KERNEL */

static inline void create_kernel_nss(void) { }

#endif /* CONFIG_SHARED_KERNEL */

/*
 * Clear bss memory
 */
static noinline __init void clear_bss_section(void)
{
      memset(__bss_start, 0, __bss_stop - __bss_start);
}

/*
 * Initialize storage key for kernel pages
 */
static noinline __init void init_kernel_storage_key(void)
{
      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 under KVM ? */
      if (cpuinfo->cpu_id.version == 0xfe)
            machine_flags |= MACHINE_FLAG_KVM;
}

static __init void early_pgm_check_handler(void)
{
      unsigned long addr;
      const struct exception_table_entry *fixup;

      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;
}

static noinline __init void setup_lowcore_early(void)
{
      psw_t psw;

      psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
      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;
      S390_lowcore.program_new_psw = psw;
      s390_base_pgm_handler_fn = early_pgm_check_handler;
}

static noinline __init void setup_hpage(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
}

static __init void detect_mvpg(void)
{
#ifndef CONFIG_64BIT
      int rc;

      asm volatile(
            "     la    0,0\n"
            "     mvpg  %2,%2\n"
            "0:   la    %0,0\n"
            "1:\n"
            EX_TABLE(0b,1b)
            : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
      if (!rc)
            machine_flags |= MACHINE_FLAG_MVPG;
#endif
}

static __init void detect_ieee(void)
{
#ifndef CONFIG_64BIT
      int rc, tmp;

      asm volatile(
            "     efpc  %1,0\n"
            "0:   la    %0,0\n"
            "1:\n"
            EX_TABLE(0b,1b)
            : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
      if (!rc)
            machine_flags |= MACHINE_FLAG_IEEE;
#endif
}

static __init void detect_csp(void)
{
#ifndef CONFIG_64BIT
      int rc;

      asm volatile(
            "     la    0,0\n"
            "     la    1,0\n"
            "     la    2,4\n"
            "     csp   0,2\n"
            "0:   la    %0,0\n"
            "1:\n"
            EX_TABLE(0b,1b)
            : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
      if (!rc)
            machine_flags |= MACHINE_FLAG_CSP;
#endif
}

static __init void detect_diag9c(void)
{
      unsigned int cpu_address;
      int rc;

      cpu_address = stap();
      asm volatile(
            "     diag  %2,0,0x9c\n"
            "0:   la    %0,0\n"
            "1:\n"
            EX_TABLE(0b,1b)
            : "=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;
      if (facilities & (1 << 23))
            machine_flags |= MACHINE_FLAG_PFMF;
      if (facilities & (1 << 4))
            machine_flags |= MACHINE_FLAG_MVCOS;
#endif
}

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
}

/* Set up boot command line */
static void __init setup_boot_command_line(void)
{
      char *parm = NULL;

      /* copy arch command line */
      strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
      boot_command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0;

      /* append IPL PARM data to the boot command line */
      if (MACHINE_IS_VM) {
            parm = boot_command_line + strlen(boot_command_line);
            *parm++ = ' ';
            get_ipl_vmparm(parm);
            if (parm[0] == '=')
                  memmove(boot_command_line, parm + 1, strlen(parm));
      }
}


/*
 * 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)
{
      ipl_save_parameters();
      rescue_initrd();
      clear_bss_section();
      init_kernel_storage_key();
      lockdep_init();
      lockdep_off();
      sort_main_extable();
      setup_lowcore_early();
      detect_machine_type();
      ipl_update_parameters();
      setup_boot_command_line();
      create_kernel_nss();
      detect_mvpg();
      detect_ieee();
      detect_csp();
      detect_diag9c();
      detect_diag44();
      detect_machine_facilities();
      setup_hpage();
      sclp_facilities_detect();
      detect_memory_layout(memory_chunk);
      lockdep_on();
}

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