diff options
Diffstat (limited to 'arch/alpha/kernel/process.c')
| -rw-r--r-- | arch/alpha/kernel/process.c | 84 |
1 files changed, 45 insertions, 39 deletions
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c index f2360a74e5d5..06522451f018 100644 --- a/arch/alpha/kernel/process.c +++ b/arch/alpha/kernel/process.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * linux/arch/alpha/kernel/process.c * @@ -8,9 +9,13 @@ * This file handles the architecture-dependent parts of process handling. */ +#include <linux/cpu.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/sched/task.h> +#include <linux/sched/task_stack.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/smp.h> @@ -31,9 +36,8 @@ #include <linux/rcupdate.h> #include <asm/reg.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/io.h> -#include <asm/pgtable.h> #include <asm/hwrpb.h> #include <asm/fpu.h> @@ -46,6 +50,23 @@ void (*pm_power_off)(void) = machine_power_off; EXPORT_SYMBOL(pm_power_off); +#ifdef CONFIG_ALPHA_WTINT +/* + * Sleep the CPU. + * EV6, LCA45 and QEMU know how to power down, skipping N timer interrupts. + */ +void arch_cpu_idle(void) +{ + wtint(0); +} + +void __noreturn arch_cpu_idle_dead(void) +{ + wtint(INT_MAX); + BUG(); +} +#endif /* ALPHA_WTINT */ + struct halt_info { int mode; char *restart_cmd; @@ -54,7 +75,7 @@ struct halt_info { static void common_shutdown_1(void *generic_ptr) { - struct halt_info *how = (struct halt_info *)generic_ptr; + struct halt_info *how = generic_ptr; struct percpu_struct *cpup; unsigned long *pflags, flags; int cpuid = smp_processor_id(); @@ -105,7 +126,7 @@ common_shutdown_1(void *generic_ptr) /* Wait for the secondaries to halt. */ set_cpu_present(boot_cpuid, false); set_cpu_possible(boot_cpuid, false); - while (cpumask_weight(cpu_present_mask)) + while (!cpumask_empty(cpu_present_mask)) barrier(); #endif @@ -114,7 +135,7 @@ common_shutdown_1(void *generic_ptr) #ifdef CONFIG_DUMMY_CONSOLE /* If we've gotten here after SysRq-b, leave interrupt context before taking over the console. */ - if (in_interrupt()) + if (in_hardirq()) irq_exit(); /* This has the effect of resetting the VGA video origin. */ console_lock(); @@ -193,14 +214,6 @@ start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) } EXPORT_SYMBOL(start_thread); -/* - * Free current thread data structures etc.. - */ -void -exit_thread(void) -{ -} - void flush_thread(void) { @@ -213,20 +226,14 @@ flush_thread(void) current_thread_info()->pcb.unique = 0; } -void -release_thread(struct task_struct *dead_task) -{ -} - /* - * Copy an alpha thread.. + * Copy architecture-specific thread state */ - -int -copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long arg, - struct task_struct *p) +int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) { + u64 clone_flags = args->flags; + unsigned long usp = args->stack; + unsigned long tls = args->tls; extern void ret_from_fork(void); extern void ret_from_kernel_thread(void); @@ -238,15 +245,17 @@ copy_thread(unsigned long clone_flags, unsigned long usp, childstack = ((struct switch_stack *) childregs) - 1; childti->pcb.ksp = (unsigned long) childstack; childti->pcb.flags = 1; /* set FEN, clear everything else */ + childti->status |= TS_SAVED_FP | TS_RESTORE_FP; - if (unlikely(p->flags & PF_KTHREAD)) { + if (unlikely(args->fn)) { /* kernel thread */ memset(childstack, 0, sizeof(struct switch_stack) + sizeof(struct pt_regs)); childstack->r26 = (unsigned long) ret_from_kernel_thread; - childstack->r9 = usp; /* function */ - childstack->r10 = arg; - childregs->hae = alpha_mv.hae_cache, + childstack->r9 = (unsigned long) args->fn; + childstack->r10 = (unsigned long) args->fn_arg; + childregs->hae = alpha_mv.hae_cache; + memset(childti->fp, '\0', sizeof(childti->fp)); childti->pcb.usp = 0; return 0; } @@ -256,13 +265,14 @@ copy_thread(unsigned long clone_flags, unsigned long usp, required for proper operation in the case of a threaded application calling fork. */ if (clone_flags & CLONE_SETTLS) - childti->pcb.unique = regs->r20; + childti->pcb.unique = tls; + else + regs->r20 = 0; /* OSF/1 has some strange fork() semantics. */ childti->pcb.usp = usp ?: rdusp(); *childregs = *regs; childregs->r0 = 0; childregs->r19 = 0; childregs->r20 = 1; /* OSF/1 has some strange fork() semantics. */ - regs->r20 = 0; stack = ((struct switch_stack *) regs) - 1; *childstack = *stack; childstack->r26 = (unsigned long) ret_from_fork; @@ -326,14 +336,11 @@ dump_elf_task(elf_greg_t *dest, struct task_struct *task) } EXPORT_SYMBOL(dump_elf_task); -int -dump_elf_task_fp(elf_fpreg_t *dest, struct task_struct *task) +int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu) { - struct switch_stack *sw = (struct switch_stack *)task_pt_regs(task) - 1; - memcpy(dest, sw->fp, 32 * 8); + memcpy(fpu, task_thread_info(t)->fp, 32 * 8); return 1; } -EXPORT_SYMBOL(dump_elf_task_fp); /* * Return saved PC of a blocked thread. This assumes the frame @@ -349,7 +356,7 @@ EXPORT_SYMBOL(dump_elf_task_fp); * all. -- r~ */ -unsigned long +static unsigned long thread_saved_pc(struct task_struct *t) { unsigned long base = (unsigned long)task_stack_page(t); @@ -365,12 +372,11 @@ thread_saved_pc(struct task_struct *t) } unsigned long -get_wchan(struct task_struct *p) +__get_wchan(struct task_struct *p) { unsigned long schedule_frame; unsigned long pc; - if (!p || p == current || p->state == TASK_RUNNING) - return 0; + /* * This one depends on the frame size of schedule(). Do a * "disass schedule" in gdb to find the frame size. Also, the |