diff options
Diffstat (limited to 'physmem/frame.c')
| -rw-r--r-- | physmem/frame.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/physmem/frame.c b/physmem/frame.c deleted file mode 100644 index cd87388..0000000 --- a/physmem/frame.c +++ /dev/null @@ -1,186 +0,0 @@ -/* frame.c - Frame management. - Copyright (C) 2004, 2005 Free Software Foundation, Inc. - Written by Neal H. Walfield <neal@gnu.org>. - - This file is part of the GNU Hurd. - - The GNU Hurd is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License as - published by the Free Software Foundation; either version 2, or (at - your option) any later version. - - The GNU Hurd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with the GNU Hurd; see the file COPYING. If not, write to - the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, - USA. */ - -#if HAVE_CONFIG_H -#include <config.h> -#endif - -#include <assert.h> -#include <errno.h> -#include <pthread.h> -#include <l4.h> -#include <hurd/btree.h> -#include <hurd/slab.h> - -#include <compiler.h> - -#include "priv.h" -#include "zalloc.h" - -void -frame_dump (struct frame *frame) -{ - struct frame_entry *fe; - - printf ("frame: %x (%d refs). memory: %x+%x\n", - frame, frame->refs, - l4_address (frame->memory), l4_size (frame->memory)); - printf ("Frame entries: "); - for (fe = frame->frame_entries; fe; fe = fe->next) - printf ("fe %x:%x+%x@%x on %x", fe, - fe->region.start, fe->region.size, fe->frame_offset, - fe->frame); - printf ("\n"); -} - -static error_t -frame_constructor (void *hook, struct frame *frame) -{ - frame->refs = 1; - pthread_mutex_init (&frame->lock, 0); - pthread_mutex_lock (&frame->lock); - frame->frame_entries = 0; - frame->cow = 0; - - return 0; -} - -SLAB_CLASS(frame, struct frame) - -static struct hurd_frame_slab_space frame_space; - -void -frame_init (void) -{ - hurd_frame_slab_init (&frame_space, NULL, NULL, - frame_constructor, NULL, NULL); -} - -struct frame * -frame_alloc (size_t size) -{ - error_t err; - struct frame *frame; - - /* The size must be a power of 2. */ - assert ((size & (size - 1)) == 0); - - err = hurd_frame_slab_alloc (&frame_space, &frame); - if (err) - /* XXX: Free some memory and try again. */ - assert_perror (err); - - assert (frame->refs == 1); - frame->memory = l4_fpage (0, size); - frame->may_be_mapped = 0; - assert (frame->cow == 0); - assert (pthread_mutex_trylock (&frame->lock) == EBUSY); - assert (frame->frame_entries == 0); - - return frame; -} - -/* Allocate the reserved physical memory for frame FRAME. */ -void -frame_memory_alloc (struct frame *frame) -{ - assert (! l4_address (frame->memory)); - - frame->memory = l4_fpage (zalloc (l4_size (frame->memory)), - l4_size (frame->memory)); - if (! l4_address (frame->memory)) - /* We already have the memory reservation, we just need to find - it. zalloc may have failed for a number of reasons: - - - There is no contiguous block of memory frame->SIZE bytes - currently in the pool. - - We may need to reclaim extra frames - */ - { - /* XXX: For now we just bail. */ - assert (l4_address (frame->memory)); - } - - debug ("allocated physical memory: %x+%x\n", - l4_address (frame->memory), l4_size (frame->memory)); -} - -void -frame_deref (struct frame *frame) -{ - assert (pthread_mutex_trylock (&frame->lock) == EBUSY); - - if (EXPECT_FALSE (frame->refs == 1)) - /* Last reference. Deallocate this frame. */ - { - /* There better not be any users. */ - assert (! frame->frame_entries); - - if (frame->may_be_mapped) - { - assert (l4_address (frame->memory)); - l4_unmap_fpage (l4_fpage_add_rights (frame->memory, - L4_FPAGE_FULLY_ACCESSIBLE)); - } - - if (l4_address (frame->memory)) - zfree (l4_address (frame->memory), l4_size (frame->memory)); - - assert (frame->frame_entries == 0); - assert (frame->cow == 0); -#ifndef NDEBUG - frame->memory = l4_fpage (0xDEAD000, 0); -#endif - - hurd_frame_slab_dealloc (&frame_space, frame); - } - else - { - frame->refs --; - pthread_mutex_unlock (&frame->lock); - } -} - -void -frame_add_user (struct frame *frame, struct frame_entry *frame_entry) -{ - assert (pthread_mutex_trylock (&frame->lock) == EBUSY); - assert (frame->refs > 0); - - /* Add FRAME_ENTRY to the list of the users of FRAME. */ - frame_entry->next = frame->frame_entries; - if (frame_entry->next) - frame_entry->next->prevp = &frame_entry->next; - frame_entry->prevp = &frame->frame_entries; - frame->frame_entries = frame_entry; -} - -void -frame_drop_user (struct frame *frame, struct frame_entry *frame_entry) -{ - assert (pthread_mutex_trylock (&frame->lock) == EBUSY); - assert (frame->refs > 0); - assert (frame_entry->frame == frame); - - *frame_entry->prevp = frame_entry->next; - if (frame_entry->next) - frame_entry->next->prevp = frame_entry->prevp; -} |