102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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struct kmem_cache *task_xstate_cachep = NULL;
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unsigned int xstate_size;
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int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
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{
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*dst = *src;
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if (src->thread.xstate) {
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dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
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GFP_KERNEL);
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if (!dst->thread.xstate)
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return -ENOMEM;
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memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
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}
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return 0;
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}
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void free_thread_xstate(struct task_struct *tsk)
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{
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if (tsk->thread.xstate) {
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kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
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tsk->thread.xstate = NULL;
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}
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}
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#if THREAD_SHIFT < PAGE_SHIFT
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static struct kmem_cache *thread_info_cache;
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struct thread_info *alloc_thread_info(struct task_struct *tsk)
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{
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struct thread_info *ti;
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ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
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if (unlikely(ti == NULL))
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return NULL;
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#ifdef CONFIG_DEBUG_STACK_USAGE
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memset(ti, 0, THREAD_SIZE);
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#endif
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return ti;
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}
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void free_thread_info(struct thread_info *ti)
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{
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free_thread_xstate(ti->task);
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kmem_cache_free(thread_info_cache, ti);
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}
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void thread_info_cache_init(void)
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{
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thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
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THREAD_SIZE, SLAB_PANIC, NULL);
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}
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#else
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struct thread_info *alloc_thread_info(struct task_struct *tsk)
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{
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#ifdef CONFIG_DEBUG_STACK_USAGE
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gfp_t mask = GFP_KERNEL | __GFP_ZERO;
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#else
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gfp_t mask = GFP_KERNEL;
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#endif
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return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER);
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}
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void free_thread_info(struct thread_info *ti)
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{
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free_thread_xstate(ti->task);
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free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
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}
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#endif /* THREAD_SHIFT < PAGE_SHIFT */
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void arch_task_cache_init(void)
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{
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if (!xstate_size)
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return;
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task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
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__alignof__(union thread_xstate),
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SLAB_PANIC | SLAB_NOTRACK, NULL);
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}
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#ifdef CONFIG_SH_FPU_EMU
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# define HAVE_SOFTFP 1
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#else
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# define HAVE_SOFTFP 0
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#endif
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void __cpuinit init_thread_xstate(void)
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{
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if (boot_cpu_data.flags & CPU_HAS_FPU)
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xstate_size = sizeof(struct sh_fpu_hard_struct);
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else if (HAVE_SOFTFP)
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xstate_size = sizeof(struct sh_fpu_soft_struct);
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else
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xstate_size = 0;
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}
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