| 0,0 → 1,104 |
|---|
| /* |
| * Copyright (C) 2005 Jakub Jermar |
| * Copyright (C) 2005 Sergey Bondari |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __FRAME_H__ |
| #define __FRAME_H__ |
| |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <list.h> |
| #include <synch/spinlock.h> |
| #include <mm/buddy.h> |
| |
| #define FRAME_KA 1 /* skip frames conflicting with user address space */ |
| #define FRAME_PANIC 2 /* panic on failure */ |
| |
| #define FRAME2ADDR(zone, frame) ((zone)->base + ((frame) - (zone)->frames) * FRAME_SIZE) |
| #define ADDR2FRAME(zone, addr) (&((zone)->frames[((addr) - (zone)->base) / FRAME_SIZE])) |
| #define FRAME_INDEX(zone, frame) ((count_t)((frame) - (zone)->frames)) |
| #define IS_BUDDY_LEFT_BLOCK(zone, frame) ((FRAME_INDEX((zone), (frame)) % (1 >> ((frame)->buddy_order + 1))) == 0) |
| #define IS_BUDDY_RIGHT_BLOCK(zone, frame) ((FRAME_INDEX((zone), (frame)) % (1 >> ((frame)->buddy_order + 1))) == (1 >> (frame)->buddy_order)) |
| |
| |
| |
| struct zone { |
| link_t link; /**< link to previous and next zone */ |
| |
| spinlock_t lock; /**< this lock protects everything below */ |
| __address base; /**< physical address of the first frame in the frames array */ |
| frame_t *frames; /**< array of frame_t structures in this zone */ |
| link_t free_head; /**< list of free frame_t structures */ |
| count_t free_count; /**< number of frame_t structures in free list */ |
| count_t busy_count; /**< number of frame_t structures not in free list */ |
| |
| buddy_system_t * buddy_system; /**< buddy system for the zone */ |
| int flags; |
| }; |
| |
| struct frame { |
| count_t refcount; /**< when == 0, the frame is in free list */ |
| link_t link; /**< link to zone free list when refcount == 0 */ |
| __u8 buddy_order; /**< buddy system block order */ |
| link_t buddy_link; /**< link to the next free block inside one order*/ |
| }; |
| |
| extern spinlock_t zone_head_lock; /**< this lock protects zone_head list */ |
| extern link_t zone_head; /**< list of all zones in the system */ |
| |
| extern void zone_init(void); |
| extern zone_t *zone_create(__address start, size_t size, int flags); |
| extern void zone_attach(zone_t *zone); |
| |
| extern void frame_init(void); |
| extern void frame_initialize(frame_t *frame, zone_t *zone); |
| __address frame_alloc(int flags); |
| extern void frame_free(__address addr); |
| extern void frame_not_free(__address addr); |
| extern void frame_region_not_free(__address start, __address stop); |
| zone_t * get_zone_by_frame(frame_t * frame); |
| |
| /* |
| * Buddy system operations |
| */ |
| link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * buddy); |
| link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block); |
| link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * buddy_l, link_t * buddy_r); |
| void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order); |
| __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block); |
| |
| __address zone_buddy_frame_alloc(int flags, __u8 order); |
| void zone_buddy_frame_free(__address addr); |
| |
| /* |
| * TODO: Implement the following functions. |
| */ |
| extern frame_t *frame_reference(frame_t *frame); |
| extern void frame_release(frame_t *frame); |
| |
| #endif |