diff options
Diffstat (limited to 'arch/m32r/kernel/smp.c')
| -rw-r--r-- | arch/m32r/kernel/smp.c | 836 |
1 files changed, 0 insertions, 836 deletions
diff --git a/arch/m32r/kernel/smp.c b/arch/m32r/kernel/smp.c deleted file mode 100644 index 564052e3d3a0..000000000000 --- a/arch/m32r/kernel/smp.c +++ /dev/null @@ -1,836 +0,0 @@ -/* - * linux/arch/m32r/kernel/smp.c - * - * M32R SMP support routines. - * - * Copyright (c) 2001, 2002 Hitoshi Yamamoto - * - * Taken from i386 version. - * (c) 1995 Alan Cox, Building #3 <alan@redhat.com> - * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com> - * - * This code is released under the GNU General Public License version 2 or - * later. - */ - -#undef DEBUG_SMP - -#include <linux/irq.h> -#include <linux/interrupt.h> -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/profile.h> -#include <linux/cpu.h> - -#include <asm/cacheflush.h> -#include <asm/pgalloc.h> -#include <linux/atomic.h> -#include <asm/io.h> -#include <asm/mmu_context.h> -#include <asm/m32r.h> -#include <asm/tlbflush.h> - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* Data structures and variables */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -/* - * For flush_cache_all() - */ -static DEFINE_SPINLOCK(flushcache_lock); -static volatile unsigned long flushcache_cpumask = 0; - -/* - * For flush_tlb_others() - */ -static cpumask_t flush_cpumask; -static struct mm_struct *flush_mm; -static struct vm_area_struct *flush_vma; -static volatile unsigned long flush_va; -static DEFINE_SPINLOCK(tlbstate_lock); -#define FLUSH_ALL 0xffffffff - -DECLARE_PER_CPU(int, prof_multiplier); -DECLARE_PER_CPU(int, prof_old_multiplier); -DECLARE_PER_CPU(int, prof_counter); - -extern spinlock_t ipi_lock[]; - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* Function Prototypes */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -void smp_reschedule_interrupt(void); -void smp_flush_cache_all_interrupt(void); - -static void flush_tlb_all_ipi(void *); -static void flush_tlb_others(cpumask_t, struct mm_struct *, - struct vm_area_struct *, unsigned long); - -void smp_invalidate_interrupt(void); - -static void stop_this_cpu(void *); - -void smp_ipi_timer_interrupt(struct pt_regs *); -void smp_local_timer_interrupt(void); - -static void send_IPI_allbutself(int, int); -static void send_IPI_mask(const struct cpumask *, int, int); - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* Rescheduling request Routines */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -/*==========================================================================* - * Name: smp_send_reschedule - * - * Description: This routine requests other CPU to execute rescheduling. - * 1.Send 'RESCHEDULE_IPI' to other CPU. - * Request other CPU to execute 'smp_reschedule_interrupt()'. - * - * Born on Date: 2002.02.05 - * - * Arguments: cpu_id - Target CPU ID - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_send_reschedule(int cpu_id) -{ - WARN_ON(cpu_is_offline(cpu_id)); - send_IPI_mask(cpumask_of(cpu_id), RESCHEDULE_IPI, 1); -} - -/*==========================================================================* - * Name: smp_reschedule_interrupt - * - * Description: This routine executes on CPU which received - * 'RESCHEDULE_IPI'. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_reschedule_interrupt(void) -{ - scheduler_ipi(); -} - -/*==========================================================================* - * Name: smp_flush_cache_all - * - * Description: This routine sends a 'INVALIDATE_CACHE_IPI' to all other - * CPUs in the system. - * - * Born on Date: 2003-05-28 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_flush_cache_all(void) -{ - cpumask_t cpumask; - unsigned long *mask; - - preempt_disable(); - cpumask_copy(&cpumask, cpu_online_mask); - cpumask_clear_cpu(smp_processor_id(), &cpumask); - spin_lock(&flushcache_lock); - mask=cpumask_bits(&cpumask); - atomic_or(*mask, (atomic_t *)&flushcache_cpumask); - send_IPI_mask(&cpumask, INVALIDATE_CACHE_IPI, 0); - _flush_cache_copyback_all(); - while (flushcache_cpumask) - mb(); - spin_unlock(&flushcache_lock); - preempt_enable(); -} -EXPORT_SYMBOL(smp_flush_cache_all); - -void smp_flush_cache_all_interrupt(void) -{ - _flush_cache_copyback_all(); - clear_bit(smp_processor_id(), &flushcache_cpumask); -} - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* TLB flush request Routines */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -/*==========================================================================* - * Name: smp_flush_tlb_all - * - * Description: This routine flushes all processes TLBs. - * 1.Request other CPU to execute 'flush_tlb_all_ipi()'. - * 2.Execute 'do_flush_tlb_all_local()'. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_flush_tlb_all(void) -{ - unsigned long flags; - - preempt_disable(); - local_irq_save(flags); - __flush_tlb_all(); - local_irq_restore(flags); - smp_call_function(flush_tlb_all_ipi, NULL, 1); - preempt_enable(); -} - -/*==========================================================================* - * Name: flush_tlb_all_ipi - * - * Description: This routine flushes all local TLBs. - * 1.Execute 'do_flush_tlb_all_local()'. - * - * Born on Date: 2002.02.05 - * - * Arguments: *info - not used - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -static void flush_tlb_all_ipi(void *info) -{ - __flush_tlb_all(); -} - -/*==========================================================================* - * Name: smp_flush_tlb_mm - * - * Description: This routine flushes the specified mm context TLB's. - * - * Born on Date: 2002.02.05 - * - * Arguments: *mm - a pointer to the mm struct for flush TLB - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_flush_tlb_mm(struct mm_struct *mm) -{ - int cpu_id; - cpumask_t cpu_mask; - unsigned long *mmc; - unsigned long flags; - - preempt_disable(); - cpu_id = smp_processor_id(); - mmc = &mm->context[cpu_id]; - cpumask_copy(&cpu_mask, mm_cpumask(mm)); - cpumask_clear_cpu(cpu_id, &cpu_mask); - - if (*mmc != NO_CONTEXT) { - local_irq_save(flags); - *mmc = NO_CONTEXT; - if (mm == current->mm) - activate_context(mm); - else - cpumask_clear_cpu(cpu_id, mm_cpumask(mm)); - local_irq_restore(flags); - } - if (!cpumask_empty(&cpu_mask)) - flush_tlb_others(cpu_mask, mm, NULL, FLUSH_ALL); - - preempt_enable(); -} - -/*==========================================================================* - * Name: smp_flush_tlb_range - * - * Description: This routine flushes a range of pages. - * - * Born on Date: 2002.02.05 - * - * Arguments: *mm - a pointer to the mm struct for flush TLB - * start - not used - * end - not used - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, - unsigned long end) -{ - smp_flush_tlb_mm(vma->vm_mm); -} - -/*==========================================================================* - * Name: smp_flush_tlb_page - * - * Description: This routine flushes one page. - * - * Born on Date: 2002.02.05 - * - * Arguments: *vma - a pointer to the vma struct include va - * va - virtual address for flush TLB - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long va) -{ - struct mm_struct *mm = vma->vm_mm; - int cpu_id; - cpumask_t cpu_mask; - unsigned long *mmc; - unsigned long flags; - - preempt_disable(); - cpu_id = smp_processor_id(); - mmc = &mm->context[cpu_id]; - cpumask_copy(&cpu_mask, mm_cpumask(mm)); - cpumask_clear_cpu(cpu_id, &cpu_mask); - -#ifdef DEBUG_SMP - if (!mm) - BUG(); -#endif - - if (*mmc != NO_CONTEXT) { - local_irq_save(flags); - va &= PAGE_MASK; - va |= (*mmc & MMU_CONTEXT_ASID_MASK); - __flush_tlb_page(va); - local_irq_restore(flags); - } - if (!cpumask_empty(&cpu_mask)) - flush_tlb_others(cpu_mask, mm, vma, va); - - preempt_enable(); -} - -/*==========================================================================* - * Name: flush_tlb_others - * - * Description: This routine requests other CPU to execute flush TLB. - * 1.Setup parameters. - * 2.Send 'INVALIDATE_TLB_IPI' to other CPU. - * Request other CPU to execute 'smp_invalidate_interrupt()'. - * 3.Wait for other CPUs operation finished. - * - * Born on Date: 2002.02.05 - * - * Arguments: cpumask - bitmap of target CPUs - * *mm - a pointer to the mm struct for flush TLB - * *vma - a pointer to the vma struct include va - * va - virtual address for flush TLB - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm, - struct vm_area_struct *vma, unsigned long va) -{ - unsigned long *mask; -#ifdef DEBUG_SMP - unsigned long flags; - __save_flags(flags); - if (!(flags & 0x0040)) /* Interrupt Disable NONONO */ - BUG(); -#endif /* DEBUG_SMP */ - - /* - * A couple of (to be removed) sanity checks: - * - * - we do not send IPIs to not-yet booted CPUs. - * - current CPU must not be in mask - * - mask must exist :) - */ - BUG_ON(cpumask_empty(&cpumask)); - - BUG_ON(cpumask_test_cpu(smp_processor_id(), &cpumask)); - BUG_ON(!mm); - - /* If a CPU which we ran on has gone down, OK. */ - cpumask_and(&cpumask, &cpumask, cpu_online_mask); - if (cpumask_empty(&cpumask)) - return; - - /* - * i'm not happy about this global shared spinlock in the - * MM hot path, but we'll see how contended it is. - * Temporarily this turns IRQs off, so that lockups are - * detected by the NMI watchdog. - */ - spin_lock(&tlbstate_lock); - - flush_mm = mm; - flush_vma = vma; - flush_va = va; - mask=cpumask_bits(&cpumask); - atomic_or(*mask, (atomic_t *)&flush_cpumask); - - /* - * We have to send the IPI only to - * CPUs affected. - */ - send_IPI_mask(&cpumask, INVALIDATE_TLB_IPI, 0); - - while (!cpumask_empty(&flush_cpumask)) { - /* nothing. lockup detection does not belong here */ - mb(); - } - - flush_mm = NULL; - flush_vma = NULL; - flush_va = 0; - spin_unlock(&tlbstate_lock); -} - -/*==========================================================================* - * Name: smp_invalidate_interrupt - * - * Description: This routine executes on CPU which received - * 'INVALIDATE_TLB_IPI'. - * 1.Flush local TLB. - * 2.Report flush TLB process was finished. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_invalidate_interrupt(void) -{ - int cpu_id = smp_processor_id(); - unsigned long *mmc = &flush_mm->context[cpu_id]; - - if (!cpumask_test_cpu(cpu_id, &flush_cpumask)) - return; - - if (flush_va == FLUSH_ALL) { - *mmc = NO_CONTEXT; - if (flush_mm == current->active_mm) - activate_context(flush_mm); - else - cpumask_clear_cpu(cpu_id, mm_cpumask(flush_mm)); - } else { - unsigned long va = flush_va; - - if (*mmc != NO_CONTEXT) { - va &= PAGE_MASK; - va |= (*mmc & MMU_CONTEXT_ASID_MASK); - __flush_tlb_page(va); - } - } - cpumask_clear_cpu(cpu_id, &flush_cpumask); -} - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* Stop CPU request Routines */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -/*==========================================================================* - * Name: smp_send_stop - * - * Description: This routine requests stop all CPUs. - * 1.Request other CPU to execute 'stop_this_cpu()'. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_send_stop(void) -{ - smp_call_function(stop_this_cpu, NULL, 0); -} - -/*==========================================================================* - * Name: stop_this_cpu - * - * Description: This routine halt CPU. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -static void stop_this_cpu(void *dummy) -{ - int cpu_id = smp_processor_id(); - - /* - * Remove this CPU: - */ - set_cpu_online(cpu_id, false); - - /* - * PSW IE = 1; - * IMASK = 0; - * goto SLEEP - */ - local_irq_disable(); - outl(0, M32R_ICU_IMASK_PORTL); - inl(M32R_ICU_IMASK_PORTL); /* dummy read */ - local_irq_enable(); - - for ( ; ; ); -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - send_IPI_mask(mask, CALL_FUNCTION_IPI, 0); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - send_IPI_mask(cpumask_of(cpu), CALL_FUNC_SINGLE_IPI, 0); -} - -/*==========================================================================* - * Name: smp_call_function_interrupt - * - * Description: This routine executes on CPU which received - * 'CALL_FUNCTION_IPI'. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_call_function_interrupt(void) -{ - irq_enter(); - generic_smp_call_function_interrupt(); - irq_exit(); -} - -void smp_call_function_single_interrupt(void) -{ - irq_enter(); - generic_smp_call_function_single_interrupt(); - irq_exit(); -} - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* Timer Routines */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -/*==========================================================================* - * Name: smp_send_timer - * - * Description: This routine sends a 'LOCAL_TIMER_IPI' to all other CPUs - * in the system. - * - * Born on Date: 2002.02.05 - * - * Arguments: NONE - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_send_timer(void) -{ - send_IPI_allbutself(LOCAL_TIMER_IPI, 1); -} - -/*==========================================================================* - * Name: smp_send_timer - * - * Description: This routine executes on CPU which received - * 'LOCAL_TIMER_IPI'. - * - * Born on Date: 2002.02.05 - * - * Arguments: *regs - a pointer to the saved regster info - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -void smp_ipi_timer_interrupt(struct pt_regs *regs) -{ - struct pt_regs *old_regs; - old_regs = set_irq_regs(regs); - irq_enter(); - smp_local_timer_interrupt(); - irq_exit(); - set_irq_regs(old_regs); -} - -/*==========================================================================* - * Name: smp_local_timer_interrupt - * - * Description: Local timer interrupt handler. It does both profiling and - * process statistics/rescheduling. - * We do profiling in every local tick, statistics/rescheduling - * happen only every 'profiling multiplier' ticks. The default - * multiplier is 1 and it can be changed by writing the new - * multiplier value into /proc/profile. - * - * Born on Date: 2002.02.05 - * - * Arguments: *regs - a pointer to the saved regster info - * - * Returns: void (cannot fail) - * - * Original: arch/i386/kernel/apic.c - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * 2003-06-24 hy use per_cpu structure. - *==========================================================================*/ -void smp_local_timer_interrupt(void) -{ - int user = user_mode(get_irq_regs()); - int cpu_id = smp_processor_id(); - - /* - * The profiling function is SMP safe. (nothing can mess - * around with "current", and the profiling counters are - * updated with atomic operations). This is especially - * useful with a profiling multiplier != 1 - */ - - profile_tick(CPU_PROFILING); - - if (--per_cpu(prof_counter, cpu_id) <= 0) { - /* - * The multiplier may have changed since the last time we got - * to this point as a result of the user writing to - * /proc/profile. In this case we need to adjust the APIC - * timer accordingly. - * - * Interrupts are already masked off at this point. - */ - per_cpu(prof_counter, cpu_id) - = per_cpu(prof_multiplier, cpu_id); - if (per_cpu(prof_counter, cpu_id) - != per_cpu(prof_old_multiplier, cpu_id)) - { - per_cpu(prof_old_multiplier, cpu_id) - = per_cpu(prof_counter, cpu_id); - } - - update_process_times(user); - } -} - -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ -/* Send IPI Routines */ -/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ - -/*==========================================================================* - * Name: send_IPI_allbutself - * - * Description: This routine sends a IPI to all other CPUs in the system. - * - * Born on Date: 2002.02.05 - * - * Arguments: ipi_num - Number of IPI - * try - 0 : Send IPI certainly. - * !0 : The following IPI is not sent when Target CPU - * has not received the before IPI. - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -static void send_IPI_allbutself(int ipi_num, int try) -{ - cpumask_t cpumask; - - cpumask_copy(&cpumask, cpu_online_mask); - cpumask_clear_cpu(smp_processor_id(), &cpumask); - - send_IPI_mask(&cpumask, ipi_num, try); -} - -/*==========================================================================* - * Name: send_IPI_mask - * - * Description: This routine sends a IPI to CPUs in the system. - * - * Born on Date: 2002.02.05 - * - * Arguments: cpu_mask - Bitmap of target CPUs logical ID - * ipi_num - Number of IPI - * try - 0 : Send IPI certainly. - * !0 : The following IPI is not sent when Target CPU - * has not received the before IPI. - * - * Returns: void (cannot fail) - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -static void send_IPI_mask(const struct cpumask *cpumask, int ipi_num, int try) -{ - cpumask_t physid_mask, tmp; - int cpu_id, phys_id; - int num_cpus = num_online_cpus(); - - if (num_cpus <= 1) /* NO MP */ - return; - - cpumask_and(&tmp, cpumask, cpu_online_mask); - BUG_ON(!cpumask_equal(cpumask, &tmp)); - - cpumask_clear(&physid_mask); - for_each_cpu(cpu_id, cpumask) { - if ((phys_id = cpu_to_physid(cpu_id)) != -1) - cpumask_set_cpu(phys_id, &physid_mask); - } - - send_IPI_mask_phys(&physid_mask, ipi_num, try); -} - -/*==========================================================================* - * Name: send_IPI_mask_phys - * - * Description: This routine sends a IPI to other CPUs in the system. - * - * Born on Date: 2002.02.05 - * - * Arguments: cpu_mask - Bitmap of target CPUs physical ID - * ipi_num - Number of IPI - * try - 0 : Send IPI certainly. - * !0 : The following IPI is not sent when Target CPU - * has not received the before IPI. - * - * Returns: IPICRi regster value. - * - * Modification log: - * Date Who Description - * ---------- --- -------------------------------------------------------- - * - *==========================================================================*/ -unsigned long send_IPI_mask_phys(const cpumask_t *physid_mask, int ipi_num, - int try) -{ - spinlock_t *ipilock; - volatile unsigned long *ipicr_addr; - unsigned long ipicr_val; - unsigned long my_physid_mask; - unsigned long mask = cpumask_bits(physid_mask)[0]; - - - if (mask & ~physids_coerce(phys_cpu_present_map)) - BUG(); - if (ipi_num >= NR_IPIS || ipi_num < 0) - BUG(); - - mask <<= IPI_SHIFT; - ipilock = &ipi_lock[ipi_num]; - ipicr_addr = (volatile unsigned long *)(M32R_ICU_IPICR_ADDR - + (ipi_num << 2)); - my_physid_mask = ~(1 << smp_processor_id()); - - /* - * lock ipi_lock[i] - * check IPICRi == 0 - * write IPICRi (send IPIi) - * unlock ipi_lock[i] - */ - spin_lock(ipilock); - __asm__ __volatile__ ( - ";; CHECK IPICRi == 0 \n\t" - ".fillinsn \n" - "1: \n\t" - "ld %0, @%1 \n\t" - "and %0, %4 \n\t" - "beqz %0, 2f \n\t" - "bnez %3, 3f \n\t" - "bra 1b \n\t" - ";; WRITE IPICRi (send IPIi) \n\t" - ".fillinsn \n" - "2: \n\t" - "st %2, @%1 \n\t" - ".fillinsn \n" - "3: \n\t" - : "=&r"(ipicr_val) - : "r"(ipicr_addr), "r"(mask), "r"(try), "r"(my_physid_mask) - : "memory" - ); - spin_unlock(ipilock); - - return ipicr_val; -} |