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- /*
- * Architecture-specific setup.
- *
- * Copyright (C) 1998-2003 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support
- *
- * 2005-10-07 Keith Owens <kaos@sgi.com>
- * Add notify_die() hooks.
- */
- #include <linux/cpu.h>
- #include <linux/pm.h>
- #include <linux/elf.h>
- #include <linux/errno.h>
- #include <linux/kallsyms.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/module.h>
- #include <linux/notifier.h>
- #include <linux/personality.h>
- #include <linux/sched.h>
- #include <linux/stddef.h>
- #include <linux/thread_info.h>
- #include <linux/unistd.h>
- #include <linux/efi.h>
- #include <linux/interrupt.h>
- #include <linux/delay.h>
- #include <linux/kdebug.h>
- #include <linux/utsname.h>
- #include <linux/tracehook.h>
- #include <linux/rcupdate.h>
- #include <asm/cpu.h>
- #include <asm/delay.h>
- #include <asm/elf.h>
- #include <asm/irq.h>
- #include <asm/kexec.h>
- #include <asm/pgalloc.h>
- #include <asm/processor.h>
- #include <asm/sal.h>
- #include <asm/switch_to.h>
- #include <asm/tlbflush.h>
- #include <asm/uaccess.h>
- #include <asm/unwind.h>
- #include <asm/user.h>
- #include "entry.h"
- #ifdef CONFIG_PERFMON
- # include <asm/perfmon.h>
- #endif
- #include "sigframe.h"
- void (*ia64_mark_idle)(int);
- unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
- EXPORT_SYMBOL(boot_option_idle_override);
- void (*pm_power_off) (void);
- EXPORT_SYMBOL(pm_power_off);
- void
- ia64_do_show_stack (struct unw_frame_info *info, void *arg)
- {
- unsigned long ip, sp, bsp;
- char buf[128]; /* don't make it so big that it overflows the stack! */
- printk("\nCall Trace:\n");
- do {
- unw_get_ip(info, &ip);
- if (ip == 0)
- break;
- unw_get_sp(info, &sp);
- unw_get_bsp(info, &bsp);
- snprintf(buf, sizeof(buf),
- " [<%016lx>] %%s\n"
- " sp=%016lx bsp=%016lx\n",
- ip, sp, bsp);
- print_symbol(buf, ip);
- } while (unw_unwind(info) >= 0);
- }
- void
- show_stack (struct task_struct *task, unsigned long *sp)
- {
- if (!task)
- unw_init_running(ia64_do_show_stack, NULL);
- else {
- struct unw_frame_info info;
- unw_init_from_blocked_task(&info, task);
- ia64_do_show_stack(&info, NULL);
- }
- }
- void
- show_regs (struct pt_regs *regs)
- {
- unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;
- print_modules();
- printk("\n");
- show_regs_print_info(KERN_DEFAULT);
- printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n",
- regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(),
- init_utsname()->release);
- print_symbol("ip is at %s\n", ip);
- printk("unat: %016lx pfs : %016lx rsc : %016lx\n",
- regs->ar_unat, regs->ar_pfs, regs->ar_rsc);
- printk("rnat: %016lx bsps: %016lx pr : %016lx\n",
- regs->ar_rnat, regs->ar_bspstore, regs->pr);
- printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n",
- regs->loadrs, regs->ar_ccv, regs->ar_fpsr);
- printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd);
- printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7);
- printk("f6 : %05lx%016lx f7 : %05lx%016lx\n",
- regs->f6.u.bits[1], regs->f6.u.bits[0],
- regs->f7.u.bits[1], regs->f7.u.bits[0]);
- printk("f8 : %05lx%016lx f9 : %05lx%016lx\n",
- regs->f8.u.bits[1], regs->f8.u.bits[0],
- regs->f9.u.bits[1], regs->f9.u.bits[0]);
- printk("f10 : %05lx%016lx f11 : %05lx%016lx\n",
- regs->f10.u.bits[1], regs->f10.u.bits[0],
- regs->f11.u.bits[1], regs->f11.u.bits[0]);
- printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3);
- printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10);
- printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13);
- printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16);
- printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19);
- printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22);
- printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25);
- printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28);
- printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31);
- if (user_mode(regs)) {
- /* print the stacked registers */
- unsigned long val, *bsp, ndirty;
- int i, sof, is_nat = 0;
- sof = regs->cr_ifs & 0x7f; /* size of frame */
- ndirty = (regs->loadrs >> 19);
- bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty);
- for (i = 0; i < sof; ++i) {
- get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i));
- printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val,
- ((i == sof - 1) || (i % 3) == 2) ? "\n" : " ");
- }
- } else
- show_stack(NULL, NULL);
- }
- /* local support for deprecated console_print */
- void
- console_print(const char *s)
- {
- printk(KERN_EMERG "%s", s);
- }
- void
- do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
- {
- if (fsys_mode(current, &scr->pt)) {
- /*
- * defer signal-handling etc. until we return to
- * privilege-level 0.
- */
- if (!ia64_psr(&scr->pt)->lp)
- ia64_psr(&scr->pt)->lp = 1;
- return;
- }
- #ifdef CONFIG_PERFMON
- if (current->thread.pfm_needs_checking)
- /*
- * Note: pfm_handle_work() allow us to call it with interrupts
- * disabled, and may enable interrupts within the function.
- */
- pfm_handle_work();
- #endif
- /* deal with pending signal delivery */
- if (test_thread_flag(TIF_SIGPENDING)) {
- local_irq_enable(); /* force interrupt enable */
- ia64_do_signal(scr, in_syscall);
- }
- if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
- local_irq_enable(); /* force interrupt enable */
- tracehook_notify_resume(&scr->pt);
- }
- /* copy user rbs to kernel rbs */
- if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
- local_irq_enable(); /* force interrupt enable */
- ia64_sync_krbs();
- }
- local_irq_disable(); /* force interrupt disable */
- }
- static int __init nohalt_setup(char * str)
- {
- cpu_idle_poll_ctrl(true);
- return 1;
- }
- __setup("nohalt", nohalt_setup);
- #ifdef CONFIG_HOTPLUG_CPU
- /* We don't actually take CPU down, just spin without interrupts. */
- static inline void play_dead(void)
- {
- unsigned int this_cpu = smp_processor_id();
- /* Ack it */
- __this_cpu_write(cpu_state, CPU_DEAD);
- max_xtp();
- local_irq_disable();
- idle_task_exit();
- ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]);
- /*
- * The above is a point of no-return, the processor is
- * expected to be in SAL loop now.
- */
- BUG();
- }
- #else
- static inline void play_dead(void)
- {
- BUG();
- }
- #endif /* CONFIG_HOTPLUG_CPU */
- void arch_cpu_idle_dead(void)
- {
- play_dead();
- }
- void arch_cpu_idle(void)
- {
- void (*mark_idle)(int) = ia64_mark_idle;
- #ifdef CONFIG_SMP
- min_xtp();
- #endif
- rmb();
- if (mark_idle)
- (*mark_idle)(1);
- safe_halt();
- if (mark_idle)
- (*mark_idle)(0);
- #ifdef CONFIG_SMP
- normal_xtp();
- #endif
- }
- void
- ia64_save_extra (struct task_struct *task)
- {
- #ifdef CONFIG_PERFMON
- unsigned long info;
- #endif
- if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
- ia64_save_debug_regs(&task->thread.dbr[0]);
- #ifdef CONFIG_PERFMON
- if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
- pfm_save_regs(task);
- info = __this_cpu_read(pfm_syst_info);
- if (info & PFM_CPUINFO_SYST_WIDE)
- pfm_syst_wide_update_task(task, info, 0);
- #endif
- }
- void
- ia64_load_extra (struct task_struct *task)
- {
- #ifdef CONFIG_PERFMON
- unsigned long info;
- #endif
- if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
- ia64_load_debug_regs(&task->thread.dbr[0]);
- #ifdef CONFIG_PERFMON
- if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
- pfm_load_regs(task);
- info = __this_cpu_read(pfm_syst_info);
- if (info & PFM_CPUINFO_SYST_WIDE)
- pfm_syst_wide_update_task(task, info, 1);
- #endif
- }
- /*
- * Copy the state of an ia-64 thread.
- *
- * We get here through the following call chain:
- *
- * from user-level: from kernel:
- *
- * <clone syscall> <some kernel call frames>
- * sys_clone :
- * do_fork do_fork
- * copy_thread copy_thread
- *
- * This means that the stack layout is as follows:
- *
- * +---------------------+ (highest addr)
- * | struct pt_regs |
- * +---------------------+
- * | struct switch_stack |
- * +---------------------+
- * | |
- * | memory stack |
- * | | <-- sp (lowest addr)
- * +---------------------+
- *
- * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an
- * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register,
- * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the
- * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since
- * the stack is page aligned and the page size is at least 4KB, this is always the case,
- * so there is nothing to worry about.
- */
- int
- copy_thread(unsigned long clone_flags,
- unsigned long user_stack_base, unsigned long user_stack_size,
- struct task_struct *p)
- {
- extern char ia64_ret_from_clone;
- struct switch_stack *child_stack, *stack;
- unsigned long rbs, child_rbs, rbs_size;
- struct pt_regs *child_ptregs;
- struct pt_regs *regs = current_pt_regs();
- int retval = 0;
- child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
- child_stack = (struct switch_stack *) child_ptregs - 1;
- rbs = (unsigned long) current + IA64_RBS_OFFSET;
- child_rbs = (unsigned long) p + IA64_RBS_OFFSET;
- /* copy parts of thread_struct: */
- p->thread.ksp = (unsigned long) child_stack - 16;
- /*
- * NOTE: The calling convention considers all floating point
- * registers in the high partition (fph) to be scratch. Since
- * the only way to get to this point is through a system call,
- * we know that the values in fph are all dead. Hence, there
- * is no need to inherit the fph state from the parent to the
- * child and all we have to do is to make sure that
- * IA64_THREAD_FPH_VALID is cleared in the child.
- *
- * XXX We could push this optimization a bit further by
- * clearing IA64_THREAD_FPH_VALID on ANY system call.
- * However, it's not clear this is worth doing. Also, it
- * would be a slight deviation from the normal Linux system
- * call behavior where scratch registers are preserved across
- * system calls (unless used by the system call itself).
- */
- # define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \
- | IA64_THREAD_PM_VALID)
- # define THREAD_FLAGS_TO_SET 0
- p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR)
- | THREAD_FLAGS_TO_SET);
- ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */
- if (unlikely(p->flags & PF_KTHREAD)) {
- if (unlikely(!user_stack_base)) {
- /* fork_idle() called us */
- return 0;
- }
- memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
- child_stack->r4 = user_stack_base; /* payload */
- child_stack->r5 = user_stack_size; /* argument */
- /*
- * Preserve PSR bits, except for bits 32-34 and 37-45,
- * which we can't read.
- */
- child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN;
- /* mark as valid, empty frame */
- child_ptregs->cr_ifs = 1UL << 63;
- child_stack->ar_fpsr = child_ptregs->ar_fpsr
- = ia64_getreg(_IA64_REG_AR_FPSR);
- child_stack->pr = (1 << PRED_KERNEL_STACK);
- child_stack->ar_bspstore = child_rbs;
- child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
- /* stop some PSR bits from being inherited.
- * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
- * therefore we must specify them explicitly here and not include them in
- * IA64_PSR_BITS_TO_CLEAR.
- */
- child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
- & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
- return 0;
- }
- stack = ((struct switch_stack *) regs) - 1;
- /* copy parent's switch_stack & pt_regs to child: */
- memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack));
- /* copy the parent's register backing store to the child: */
- rbs_size = stack->ar_bspstore - rbs;
- memcpy((void *) child_rbs, (void *) rbs, rbs_size);
- if (clone_flags & CLONE_SETTLS)
- child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */
- if (user_stack_base) {
- child_ptregs->r12 = user_stack_base + user_stack_size - 16;
- child_ptregs->ar_bspstore = user_stack_base;
- child_ptregs->ar_rnat = 0;
- child_ptregs->loadrs = 0;
- }
- child_stack->ar_bspstore = child_rbs + rbs_size;
- child_stack->b0 = (unsigned long) &ia64_ret_from_clone;
- /* stop some PSR bits from being inherited.
- * the psr.up/psr.pp bits must be cleared on fork but inherited on execve()
- * therefore we must specify them explicitly here and not include them in
- * IA64_PSR_BITS_TO_CLEAR.
- */
- child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
- & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
- #ifdef CONFIG_PERFMON
- if (current->thread.pfm_context)
- pfm_inherit(p, child_ptregs);
- #endif
- return retval;
- }
- static void
- do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg)
- {
- unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm;
- unsigned long uninitialized_var(ip); /* GCC be quiet */
- elf_greg_t *dst = arg;
- struct pt_regs *pt;
- char nat;
- int i;
- memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */
- if (unw_unwind_to_user(info) < 0)
- return;
- unw_get_sp(info, &sp);
- pt = (struct pt_regs *) (sp + 16);
- urbs_end = ia64_get_user_rbs_end(task, pt, &cfm);
- if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0)
- return;
- ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end),
- &ar_rnat);
- /*
- * coredump format:
- * r0-r31
- * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
- * predicate registers (p0-p63)
- * b0-b7
- * ip cfm user-mask
- * ar.rsc ar.bsp ar.bspstore ar.rnat
- * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
- */
- /* r0 is zero */
- for (i = 1, mask = (1UL << i); i < 32; ++i) {
- unw_get_gr(info, i, &dst[i], &nat);
- if (nat)
- nat_bits |= mask;
- mask <<= 1;
- }
- dst[32] = nat_bits;
- unw_get_pr(info, &dst[33]);
- for (i = 0; i < 8; ++i)
- unw_get_br(info, i, &dst[34 + i]);
- unw_get_rp(info, &ip);
- dst[42] = ip + ia64_psr(pt)->ri;
- dst[43] = cfm;
- dst[44] = pt->cr_ipsr & IA64_PSR_UM;
- unw_get_ar(info, UNW_AR_RSC, &dst[45]);
- /*
- * For bsp and bspstore, unw_get_ar() would return the kernel
- * addresses, but we need the user-level addresses instead:
- */
- dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */
- dst[47] = pt->ar_bspstore;
- dst[48] = ar_rnat;
- unw_get_ar(info, UNW_AR_CCV, &dst[49]);
- unw_get_ar(info, UNW_AR_UNAT, &dst[50]);
- unw_get_ar(info, UNW_AR_FPSR, &dst[51]);
- dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */
- unw_get_ar(info, UNW_AR_LC, &dst[53]);
- unw_get_ar(info, UNW_AR_EC, &dst[54]);
- unw_get_ar(info, UNW_AR_CSD, &dst[55]);
- unw_get_ar(info, UNW_AR_SSD, &dst[56]);
- }
- void
- do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg)
- {
- elf_fpreg_t *dst = arg;
- int i;
- memset(dst, 0, sizeof(elf_fpregset_t)); /* don't leak any "random" bits */
- if (unw_unwind_to_user(info) < 0)
- return;
- /* f0 is 0.0, f1 is 1.0 */
- for (i = 2; i < 32; ++i)
- unw_get_fr(info, i, dst + i);
- ia64_flush_fph(task);
- if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0)
- memcpy(dst + 32, task->thread.fph, 96*16);
- }
- void
- do_copy_regs (struct unw_frame_info *info, void *arg)
- {
- do_copy_task_regs(current, info, arg);
- }
- void
- do_dump_fpu (struct unw_frame_info *info, void *arg)
- {
- do_dump_task_fpu(current, info, arg);
- }
- void
- ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
- {
- unw_init_running(do_copy_regs, dst);
- }
- int
- dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
- {
- unw_init_running(do_dump_fpu, dst);
- return 1; /* f0-f31 are always valid so we always return 1 */
- }
- /*
- * Flush thread state. This is called when a thread does an execve().
- */
- void
- flush_thread (void)
- {
- /* drop floating-point and debug-register state if it exists: */
- current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID);
- ia64_drop_fpu(current);
- }
- /*
- * Clean up state associated with current thread. This is called when
- * the thread calls exit().
- */
- void
- exit_thread (void)
- {
- ia64_drop_fpu(current);
- #ifdef CONFIG_PERFMON
- /* if needed, stop monitoring and flush state to perfmon context */
- if (current->thread.pfm_context)
- pfm_exit_thread(current);
- /* free debug register resources */
- if (current->thread.flags & IA64_THREAD_DBG_VALID)
- pfm_release_debug_registers(current);
- #endif
- }
- unsigned long
- get_wchan (struct task_struct *p)
- {
- struct unw_frame_info info;
- unsigned long ip;
- int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
- return 0;
- /*
- * Note: p may not be a blocked task (it could be current or
- * another process running on some other CPU. Rather than
- * trying to determine if p is really blocked, we just assume
- * it's blocked and rely on the unwind routines to fail
- * gracefully if the process wasn't really blocked after all.
- * --davidm 99/12/15
- */
- unw_init_from_blocked_task(&info, p);
- do {
- if (p->state == TASK_RUNNING)
- return 0;
- if (unw_unwind(&info) < 0)
- return 0;
- unw_get_ip(&info, &ip);
- if (!in_sched_functions(ip))
- return ip;
- } while (count++ < 16);
- return 0;
- }
- void
- cpu_halt (void)
- {
- pal_power_mgmt_info_u_t power_info[8];
- unsigned long min_power;
- int i, min_power_state;
- if (ia64_pal_halt_info(power_info) != 0)
- return;
- min_power_state = 0;
- min_power = power_info[0].pal_power_mgmt_info_s.power_consumption;
- for (i = 1; i < 8; ++i)
- if (power_info[i].pal_power_mgmt_info_s.im
- && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) {
- min_power = power_info[i].pal_power_mgmt_info_s.power_consumption;
- min_power_state = i;
- }
- while (1)
- ia64_pal_halt(min_power_state);
- }
- void machine_shutdown(void)
- {
- #ifdef CONFIG_HOTPLUG_CPU
- int cpu;
- for_each_online_cpu(cpu) {
- if (cpu != smp_processor_id())
- cpu_down(cpu);
- }
- #endif
- #ifdef CONFIG_KEXEC
- kexec_disable_iosapic();
- #endif
- }
- void
- machine_restart (char *restart_cmd)
- {
- (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0);
- efi_reboot(REBOOT_WARM, NULL);
- }
- void
- machine_halt (void)
- {
- (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0);
- cpu_halt();
- }
- void
- machine_power_off (void)
- {
- if (pm_power_off)
- pm_power_off();
- machine_halt();
- }
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