0,0 → 1,1155 |
/* |
* Copyright (C) 2001-2005 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. |
*/ |
|
/** @addtogroup genericmm |
* @{ |
*/ |
|
/** |
* @file |
* @brief Physical frame allocator. |
* |
* This file contains the physical frame allocator and memory zone management. |
* The frame allocator is built on top of the buddy allocator. |
* |
* @see buddy.c |
*/ |
|
/* |
* Locking order |
* |
* In order to access particular zone, the process must first lock |
* the zones.lock, then lock the zone and then unlock the zones.lock. |
* This insures, that we can fiddle with the zones in runtime without |
* affecting the processes. |
* |
*/ |
|
#include <typedefs.h> |
#include <arch/types.h> |
#include <mm/frame.h> |
#include <mm/as.h> |
#include <panic.h> |
#include <debug.h> |
#include <adt/list.h> |
#include <synch/spinlock.h> |
#include <arch/asm.h> |
#include <arch.h> |
#include <print.h> |
#include <align.h> |
#include <mm/slab.h> |
#include <bitops.h> |
#include <macros.h> |
|
typedef struct { |
count_t refcount; /**< tracking of shared frames */ |
__u8 buddy_order; /**< buddy system block order */ |
link_t buddy_link; /**< link to the next free block inside one order */ |
void *parent; /**< If allocated by slab, this points there */ |
} frame_t; |
|
typedef struct { |
SPINLOCK_DECLARE(lock); /**< this lock protects everything below */ |
pfn_t base; /**< frame_no of the first frame in the frames array */ |
count_t count; /**< Size of zone */ |
|
frame_t *frames; /**< array of frame_t structures in this zone */ |
count_t free_count; /**< number of free frame_t structures */ |
count_t busy_count; /**< number of busy frame_t structures */ |
|
buddy_system_t * buddy_system; /**< buddy system for the zone */ |
int flags; |
} zone_t; |
|
/* |
* The zoneinfo.lock must be locked when accessing zoneinfo structure. |
* Some of the attributes in zone_t structures are 'read-only' |
*/ |
|
struct { |
SPINLOCK_DECLARE(lock); |
int count; |
zone_t *info[ZONES_MAX]; |
} zones; |
|
|
/*********************************/ |
/* Helper functions */ |
static inline index_t frame_index(zone_t *zone, frame_t *frame) |
{ |
return (index_t)(frame - zone->frames); |
} |
static inline index_t frame_index_abs(zone_t *zone, frame_t *frame) |
{ |
return (index_t)(frame - zone->frames) + zone->base; |
} |
static inline int frame_index_valid(zone_t *zone, index_t index) |
{ |
return index >= 0 && index < zone->count; |
} |
|
/** Compute pfn_t from frame_t pointer & zone pointer */ |
static index_t make_frame_index(zone_t *zone, frame_t *frame) |
{ |
return frame - zone->frames; |
} |
|
/** Initialize frame structure |
* |
* Initialize frame structure. |
* |
* @param frame Frame structure to be initialized. |
*/ |
static void frame_initialize(frame_t *frame) |
{ |
frame->refcount = 1; |
frame->buddy_order = 0; |
} |
|
/*************************************/ |
/* Zoneinfo functions */ |
|
/** |
* Insert-sort zone into zones list |
* |
* @param newzone New zone to be inserted into zone list |
* @return zone number on success, -1 on error |
*/ |
static int zones_add_zone(zone_t *newzone) |
{ |
int i,j; |
ipl_t ipl; |
zone_t *z; |
|
ipl = interrupts_disable(); |
spinlock_lock(&zones.lock); |
/* Try to merge */ |
if (zones.count + 1 == ZONES_MAX) |
panic("Maximum zone(%d) count exceeded.", ZONES_MAX); |
for (i = 0; i < zones.count; i++) { |
/* Check for overflow */ |
z = zones.info[i]; |
if (overlaps(newzone->base,newzone->count, |
z->base, z->count)) { |
printf("Zones overlap!\n"); |
return -1; |
} |
if (newzone->base < z->base) |
break; |
} |
/* Move other zones up */ |
for (j = i;j < zones.count; j++) |
zones.info[j + 1] = zones.info[j]; |
zones.info[i] = newzone; |
zones.count++; |
spinlock_unlock(&zones.lock); |
interrupts_restore(ipl); |
|
return i; |
} |
|
/** |
* Try to find a zone where can we find the frame |
* |
* @param frame Frame number contained in zone |
* @param pzone If not null, it is used as zone hint. Zone index |
* is filled into the variable on success. |
* @return Pointer to LOCKED zone containing frame |
* |
* Assume interrupts disable |
*/ |
static zone_t * find_zone_and_lock(pfn_t frame, int *pzone) |
{ |
int i; |
int hint = pzone ? *pzone : 0; |
zone_t *z; |
|
spinlock_lock(&zones.lock); |
|
if (hint >= zones.count || hint < 0) |
hint = 0; |
|
i = hint; |
do { |
z = zones.info[i]; |
spinlock_lock(&z->lock); |
if (z->base <= frame && z->base + z->count > frame) { |
spinlock_unlock(&zones.lock); /* Unlock the global lock */ |
if (pzone) |
*pzone = i; |
return z; |
} |
spinlock_unlock(&z->lock); |
|
i++; |
if (i >= zones.count) |
i = 0; |
} while(i != hint); |
|
spinlock_unlock(&zones.lock); |
return NULL; |
} |
|
/** @return True if zone can allocate specified order */ |
static int zone_can_alloc(zone_t *z, __u8 order) |
{ |
return buddy_system_can_alloc(z->buddy_system, order); |
} |
|
/** |
* Find AND LOCK zone that can allocate order frames |
* |
* Assume interrupts are disabled!! |
* |
* @param order Size (2^order) of free space we are trying to find |
* @param pzone Pointer to preferred zone or NULL, on return contains zone number |
*/ |
static zone_t * find_free_zone_lock(__u8 order, int *pzone) |
{ |
int i; |
zone_t *z; |
int hint = pzone ? *pzone : 0; |
|
spinlock_lock(&zones.lock); |
if (hint >= zones.count) |
hint = 0; |
i = hint; |
do { |
z = zones.info[i]; |
|
spinlock_lock(&z->lock); |
|
/* Check if the zone has 2^order frames area available */ |
if (zone_can_alloc(z, order)) { |
spinlock_unlock(&zones.lock); |
if (pzone) |
*pzone = i; |
return z; |
} |
spinlock_unlock(&z->lock); |
if (++i >= zones.count) |
i = 0; |
} while(i != hint); |
spinlock_unlock(&zones.lock); |
return NULL; |
} |
|
/********************************************/ |
/* Buddy system functions */ |
|
/** Buddy system find_block implementation |
* |
* Find block that is parent of current list. |
* That means go to lower addresses, until such block is found |
* |
* @param order - Order of parent must be different then this parameter!! |
*/ |
static link_t *zone_buddy_find_block(buddy_system_t *b, link_t *child, |
__u8 order) |
{ |
frame_t * frame; |
zone_t * zone; |
index_t index; |
|
frame = list_get_instance(child, frame_t, buddy_link); |
zone = (zone_t *) b->data; |
|
index = frame_index(zone, frame); |
do { |
if (zone->frames[index].buddy_order != order) { |
return &zone->frames[index].buddy_link; |
} |
} while(index-- > 0); |
return NULL; |
} |
|
static void zone_buddy_print_id(buddy_system_t *b, link_t *block) |
{ |
frame_t * frame; |
zone_t * zone; |
index_t index; |
|
frame = list_get_instance(block, frame_t, buddy_link); |
zone = (zone_t *) b->data; |
index = frame_index(zone, frame); |
printf("%zd", index); |
} |
|
/** Buddy system find_buddy implementation |
* |
* @param b Buddy system. |
* @param block Block for which buddy should be found |
* |
* @return Buddy for given block if found |
*/ |
static link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) |
{ |
frame_t * frame; |
zone_t * zone; |
index_t index; |
bool is_left, is_right; |
|
frame = list_get_instance(block, frame_t, buddy_link); |
zone = (zone_t *) b->data; |
ASSERT(IS_BUDDY_ORDER_OK(frame_index_abs(zone, frame), frame->buddy_order)); |
|
is_left = IS_BUDDY_LEFT_BLOCK_ABS(zone, frame); |
is_right = IS_BUDDY_RIGHT_BLOCK_ABS(zone, frame); |
|
ASSERT(is_left ^ is_right); |
if (is_left) { |
index = (frame_index(zone, frame)) + (1 << frame->buddy_order); |
} else { // if (is_right) |
index = (frame_index(zone, frame)) - (1 << frame->buddy_order); |
} |
|
if (frame_index_valid(zone, index)) { |
if (zone->frames[index].buddy_order == frame->buddy_order && |
zone->frames[index].refcount == 0) { |
return &zone->frames[index].buddy_link; |
} |
} |
|
return NULL; |
} |
|
/** Buddy system bisect implementation |
* |
* @param b Buddy system. |
* @param block Block to bisect |
* |
* @return right block |
*/ |
static link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
frame_t * frame_l, * frame_r; |
|
frame_l = list_get_instance(block, frame_t, buddy_link); |
frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
|
return &frame_r->buddy_link; |
} |
|
/** Buddy system coalesce implementation |
* |
* @param b Buddy system. |
* @param block_1 First block |
* @param block_2 First block's buddy |
* |
* @return Coalesced block (actually block that represents lower address) |
*/ |
static link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, |
link_t * block_2) |
{ |
frame_t *frame1, *frame2; |
|
frame1 = list_get_instance(block_1, frame_t, buddy_link); |
frame2 = list_get_instance(block_2, frame_t, buddy_link); |
|
return frame1 < frame2 ? block_1 : block_2; |
} |
|
/** Buddy system set_order implementation |
* |
* @param b Buddy system. |
* @param block Buddy system block |
* @param order Order to set |
*/ |
static void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
frame_t * frame; |
frame = list_get_instance(block, frame_t, buddy_link); |
frame->buddy_order = order; |
} |
|
/** Buddy system get_order implementation |
* |
* @param b Buddy system. |
* @param block Buddy system block |
* |
* @return Order of block |
*/ |
static __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
frame_t * frame; |
frame = list_get_instance(block, frame_t, buddy_link); |
return frame->buddy_order; |
} |
|
/** Buddy system mark_busy implementation |
* |
* @param b Buddy system |
* @param block Buddy system block |
* |
*/ |
static void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
frame_t * frame; |
|
frame = list_get_instance(block, frame_t, buddy_link); |
frame->refcount = 1; |
} |
|
/** Buddy system mark_available implementation |
* |
* @param b Buddy system |
* @param block Buddy system block |
* |
*/ |
static void zone_buddy_mark_available(buddy_system_t *b, link_t * block) { |
frame_t * frame; |
frame = list_get_instance(block, frame_t, buddy_link); |
frame->refcount = 0; |
} |
|
static struct buddy_system_operations zone_buddy_system_operations = { |
.find_buddy = zone_buddy_find_buddy, |
.bisect = zone_buddy_bisect, |
.coalesce = zone_buddy_coalesce, |
.set_order = zone_buddy_set_order, |
.get_order = zone_buddy_get_order, |
.mark_busy = zone_buddy_mark_busy, |
.mark_available = zone_buddy_mark_available, |
.find_block = zone_buddy_find_block, |
.print_id = zone_buddy_print_id |
}; |
|
/*************************************/ |
/* Zone functions */ |
|
/** Allocate frame in particular zone |
* |
* Assume zone is locked |
* Panics if allocation is impossible. |
* |
* @param zone Zone to allocate from. |
* @param order Allocate exactly 2^order frames. |
* |
* @return Frame index in zone |
* |
*/ |
static pfn_t zone_frame_alloc(zone_t *zone, __u8 order) |
{ |
pfn_t v; |
link_t *tmp; |
frame_t *frame; |
|
/* Allocate frames from zone buddy system */ |
tmp = buddy_system_alloc(zone->buddy_system, order); |
|
ASSERT(tmp); |
|
/* Update zone information. */ |
zone->free_count -= (1 << order); |
zone->busy_count += (1 << order); |
|
/* Frame will be actually a first frame of the block. */ |
frame = list_get_instance(tmp, frame_t, buddy_link); |
|
/* get frame address */ |
v = make_frame_index(zone, frame); |
return v; |
} |
|
/** Free frame from zone |
* |
* Assume zone is locked |
* |
* @param zone Pointer to zone from which the frame is to be freed |
* @param frame_idx Frame index relative to zone |
*/ |
static void zone_frame_free(zone_t *zone, index_t frame_idx) |
{ |
frame_t *frame; |
__u8 order; |
|
frame = &zone->frames[frame_idx]; |
|
/* remember frame order */ |
order = frame->buddy_order; |
|
ASSERT(frame->refcount); |
|
if (!--frame->refcount) { |
buddy_system_free(zone->buddy_system, &frame->buddy_link); |
|
/* Update zone information. */ |
zone->free_count += (1 << order); |
zone->busy_count -= (1 << order); |
} |
} |
|
/** Return frame from zone */ |
static frame_t * zone_get_frame(zone_t *zone, index_t frame_idx) |
{ |
ASSERT(frame_idx < zone->count); |
return &zone->frames[frame_idx]; |
} |
|
/** Mark frame in zone unavailable to allocation */ |
static void zone_mark_unavailable(zone_t *zone, index_t frame_idx) |
{ |
frame_t *frame; |
link_t *link; |
|
frame = zone_get_frame(zone, frame_idx); |
if (frame->refcount) |
return; |
link = buddy_system_alloc_block(zone->buddy_system, |
&frame->buddy_link); |
ASSERT(link); |
zone->free_count--; |
} |
|
/** |
* Join 2 zones |
* |
* Expect zone_t *z to point to space at least zone_conf_size large |
* |
* Assume z1 & z2 are locked |
* |
* @param z Target zone structure pointer |
* @param z1 Zone to merge |
* @param z2 Zone to merge |
*/ |
|
static void _zone_merge(zone_t *z, zone_t *z1, zone_t *z2) |
{ |
__u8 max_order; |
int i, z2idx; |
pfn_t frame_idx; |
frame_t *frame; |
|
ASSERT(!overlaps(z1->base,z1->count,z2->base,z2->count)); |
ASSERT(z1->base < z2->base); |
|
spinlock_initialize(&z->lock, "zone_lock"); |
z->base = z1->base; |
z->count = z2->base+z2->count - z1->base; |
z->flags = z1->flags & z2->flags; |
|
z->free_count = z1->free_count + z2->free_count; |
z->busy_count = z1->busy_count + z2->busy_count; |
|
max_order = fnzb(z->count); |
|
z->buddy_system = (buddy_system_t *)&z[1]; |
buddy_system_create(z->buddy_system, max_order, |
&zone_buddy_system_operations, |
(void *) z); |
|
z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order)); |
for (i = 0; i < z->count; i++) { |
/* This marks all frames busy */ |
frame_initialize(&z->frames[i]); |
} |
/* Copy frames from both zones to preserve full frame orders, |
* parents etc. Set all free frames with refcount=0 to 1, because |
* we add all free frames to buddy allocator later again, clear |
* order to 0. Don't set busy frames with refcount=0, as they |
* will not be reallocated during merge and it would make later |
* problems with allocation/free. |
*/ |
for (i=0; i<z1->count; i++) |
z->frames[i] = z1->frames[i]; |
for (i=0; i < z2->count; i++) { |
z2idx = i + (z2->base - z1->base); |
z->frames[z2idx] = z2->frames[i]; |
} |
i = 0; |
while (i < z->count) { |
if (z->frames[i].refcount) { |
/* skip busy frames */ |
i += 1 << z->frames[i].buddy_order; |
} else { /* Free frames, set refcount=1 */ |
/* All free frames have refcount=0, we need not |
* to check the order */ |
z->frames[i].refcount = 1; |
z->frames[i].buddy_order = 0; |
i++; |
} |
} |
/* Add free blocks from the 2 original zones */ |
while (zone_can_alloc(z1, 0)) { |
frame_idx = zone_frame_alloc(z1, 0); |
frame = &z->frames[frame_idx]; |
frame->refcount = 0; |
buddy_system_free(z->buddy_system, &frame->buddy_link); |
} |
while (zone_can_alloc(z2, 0)) { |
frame_idx = zone_frame_alloc(z2, 0); |
frame = &z->frames[frame_idx + (z2->base-z1->base)]; |
frame->refcount = 0; |
buddy_system_free(z->buddy_system, &frame->buddy_link); |
} |
} |
|
/** Return old configuration frames into the zone |
* |
* We have several cases |
* - the conf. data is outside of zone -> exit, shall we call frame_free?? |
* - the conf. data was created by zone_create or |
* updated with reduce_region -> free every frame |
* |
* @param newzone The actual zone where freeing should occur |
* @param oldzone Pointer to old zone configuration data that should |
* be freed from new zone |
*/ |
static void return_config_frames(zone_t *newzone, zone_t *oldzone) |
{ |
pfn_t pfn; |
frame_t *frame; |
count_t cframes; |
int i; |
|
pfn = ADDR2PFN((__address)KA2PA(oldzone)); |
cframes = SIZE2FRAMES(zone_conf_size(oldzone->count)); |
|
if (pfn < newzone->base || pfn >= newzone->base + newzone->count) |
return; |
|
frame = &newzone->frames[pfn - newzone->base]; |
ASSERT(!frame->buddy_order); |
|
for (i=0; i < cframes; i++) { |
newzone->busy_count++; |
zone_frame_free(newzone, pfn+i-newzone->base); |
} |
} |
|
/** Reduce allocated block to count of order 0 frames |
* |
* The allocated block need 2^order frames of space. Reduce all frames |
* in block to order 0 and free the unneeded frames. This means, that |
* when freeing the previously allocated block starting with frame_idx, |
* you have to free every frame. |
* |
* @param zone |
* @param frame_idx Index to block |
* @param count Allocated space in block |
*/ |
static void zone_reduce_region(zone_t *zone, pfn_t frame_idx, count_t count) |
{ |
count_t i; |
__u8 order; |
frame_t *frame; |
|
ASSERT(frame_idx+count < zone->count); |
|
order = zone->frames[frame_idx].buddy_order; |
ASSERT((1 << order) >= count); |
|
/* Reduce all blocks to order 0 */ |
for (i=0; i < (1 << order); i++) { |
frame = &zone->frames[i + frame_idx]; |
frame->buddy_order = 0; |
if (! frame->refcount) |
frame->refcount = 1; |
ASSERT(frame->refcount == 1); |
} |
/* Free unneeded frames */ |
for (i=count; i < (1 << order); i++) { |
zone_frame_free(zone, i + frame_idx); |
} |
} |
|
/** Merge zones z1 and z2 |
* |
* - the zones must be 2 zones with no zone existing in between, |
* which means that z2 = z1+1 |
* |
* - When you create a new zone, the frame allocator configuration does |
* not to be 2^order size. Once the allocator is running it is no longer |
* possible, merged configuration data occupies more space :-/ |
*/ |
void zone_merge(int z1, int z2) |
{ |
ipl_t ipl; |
zone_t *zone1, *zone2, *newzone; |
int cframes; |
__u8 order; |
int i; |
pfn_t pfn; |
|
ipl = interrupts_disable(); |
spinlock_lock(&zones.lock); |
|
if (z1 < 0 || z1 >= zones.count || z2 < 0 || z2 >= zones.count) |
goto errout; |
/* We can join only 2 zones with none existing inbetween */ |
if (z2-z1 != 1) |
goto errout; |
|
zone1 = zones.info[z1]; |
zone2 = zones.info[z2]; |
spinlock_lock(&zone1->lock); |
spinlock_lock(&zone2->lock); |
|
cframes = SIZE2FRAMES(zone_conf_size(zone2->base+zone2->count-zone1->base)); |
if (cframes == 1) |
order = 0; |
else |
order = fnzb(cframes - 1) + 1; |
|
/* Allocate zonedata inside one of the zones */ |
if (zone_can_alloc(zone1, order)) |
pfn = zone1->base + zone_frame_alloc(zone1, order); |
else if (zone_can_alloc(zone2, order)) |
pfn = zone2->base + zone_frame_alloc(zone2, order); |
else |
goto errout2; |
|
newzone = (zone_t *)PA2KA(PFN2ADDR(pfn)); |
|
_zone_merge(newzone, zone1, zone2); |
|
/* Free unneeded config frames */ |
zone_reduce_region(newzone, pfn - newzone->base, cframes); |
/* Subtract zone information from busy frames */ |
newzone->busy_count -= cframes; |
|
/* Replace existing zones in zoneinfo list */ |
zones.info[z1] = newzone; |
for (i = z2 + 1; i < zones.count; i++) |
zones.info[i - 1] = zones.info[i]; |
zones.count--; |
|
/* Free old zone information */ |
return_config_frames(newzone, zone1); |
return_config_frames(newzone, zone2); |
errout2: |
/* Nobody is allowed to enter to zone, so we are safe |
* to touch the spinlocks last time */ |
spinlock_unlock(&zone1->lock); |
spinlock_unlock(&zone2->lock); |
errout: |
spinlock_unlock(&zones.lock); |
interrupts_restore(ipl); |
} |
|
/** |
* Merge all zones into one big zone |
* |
* It is reasonable to do this on systems whose bios reports parts in chunks, |
* so that we could have 1 zone (it's faster). |
*/ |
void zone_merge_all(void) |
{ |
int count = zones.count; |
|
while (zones.count > 1 && --count) { |
zone_merge(0,1); |
break; |
} |
} |
|
/** Create frame zone |
* |
* Create new frame zone. |
* |
* @param start Physical address of the first frame within the zone. |
* @param count Count of frames in zone |
* @param z Address of configuration information of zone |
* @param flags Zone flags. |
* |
* @return Initialized zone. |
*/ |
static void zone_construct(pfn_t start, count_t count, zone_t *z, int flags) |
{ |
int i; |
__u8 max_order; |
|
spinlock_initialize(&z->lock, "zone_lock"); |
z->base = start; |
z->count = count; |
z->flags = flags; |
z->free_count = count; |
z->busy_count = 0; |
|
/* |
* Compute order for buddy system, initialize |
*/ |
max_order = fnzb(count); |
z->buddy_system = (buddy_system_t *)&z[1]; |
|
buddy_system_create(z->buddy_system, max_order, |
&zone_buddy_system_operations, |
(void *) z); |
|
/* Allocate frames _after_ the conframe */ |
/* Check sizes */ |
z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order)); |
for (i = 0; i<count; i++) { |
frame_initialize(&z->frames[i]); |
} |
|
/* Stuffing frames */ |
for (i = 0; i < count; i++) { |
z->frames[i].refcount = 0; |
buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
} |
} |
|
/** Compute configuration data size for zone |
* |
* @param count Size of zone in frames |
* @return Size of zone configuration info (in bytes) |
*/ |
__address zone_conf_size(count_t count) |
{ |
int size = sizeof(zone_t) + count*sizeof(frame_t); |
int max_order; |
|
max_order = fnzb(count); |
size += buddy_conf_size(max_order); |
return size; |
} |
|
/** Create and add zone to system |
* |
* @param start First frame number (absolute) |
* @param count Size of zone in frames |
* @param confframe Where configuration frames are supposed to be. |
* Automatically checks, that we will not disturb the |
* kernel and possibly init. |
* If confframe is given _outside_ this zone, it is expected, |
* that the area is already marked BUSY and big enough |
* to contain zone_conf_size() amount of data. |
* If the confframe is inside the area, the zone free frame |
* information is modified not to include it. |
* |
* @return Zone number or -1 on error |
*/ |
int zone_create(pfn_t start, count_t count, pfn_t confframe, int flags) |
{ |
zone_t *z; |
__address addr; |
count_t confcount; |
int i; |
int znum; |
|
/* Theoretically we could have here 0, practically make sure |
* nobody tries to do that. If some platform requires, remove |
* the assert |
*/ |
ASSERT(confframe); |
/* If conframe is supposed to be inside our zone, then make sure |
* it does not span kernel & init |
*/ |
confcount = SIZE2FRAMES(zone_conf_size(count)); |
if (confframe >= start && confframe < start+count) { |
for (;confframe < start + count; confframe++) { |
addr = PFN2ADDR(confframe); |
if (overlaps(addr, PFN2ADDR(confcount), KA2PA(config.base), config.kernel_size)) |
continue; |
|
bool overlap = false; |
count_t i; |
for (i = 0; i < init.cnt; i++) |
if (overlaps(addr, PFN2ADDR(confcount), KA2PA(init.tasks[i].addr), init.tasks[i].size)) { |
overlap = true; |
break; |
} |
if (overlap) |
continue; |
|
break; |
} |
if (confframe >= start + count) |
panic("Cannot find configuration data for zone."); |
} |
|
z = (zone_t *)PA2KA(PFN2ADDR(confframe)); |
zone_construct(start, count, z, flags); |
znum = zones_add_zone(z); |
if (znum == -1) |
return -1; |
|
/* If confdata in zone, mark as unavailable */ |
if (confframe >= start && confframe < start+count) |
for (i=confframe; i<confframe+confcount; i++) { |
zone_mark_unavailable(z, i - z->base); |
} |
return znum; |
} |
|
/***************************************/ |
/* Frame functions */ |
|
/** Set parent of frame */ |
void frame_set_parent(pfn_t pfn, void *data, int hint) |
{ |
zone_t *zone = find_zone_and_lock(pfn, &hint); |
|
ASSERT(zone); |
|
zone_get_frame(zone, pfn-zone->base)->parent = data; |
spinlock_unlock(&zone->lock); |
} |
|
void * frame_get_parent(pfn_t pfn, int hint) |
{ |
zone_t *zone = find_zone_and_lock(pfn, &hint); |
void *res; |
|
ASSERT(zone); |
res = zone_get_frame(zone, pfn - zone->base)->parent; |
|
spinlock_unlock(&zone->lock); |
return res; |
} |
|
/** Allocate power-of-two frames of physical memory. |
* |
* @param order Allocate exactly 2^order frames. |
* @param flags Flags for host zone selection and address processing. |
* @param status Allocation status (FRAME_OK on success), unused if NULL. |
* @param pzone Preferred zone |
* |
* @return Allocated frame. |
* |
*/ |
pfn_t frame_alloc_generic(__u8 order, int flags, int *status, int *pzone) |
{ |
ipl_t ipl; |
int freed; |
pfn_t v; |
zone_t *zone; |
|
loop: |
ipl = interrupts_disable(); |
|
/* |
* First, find suitable frame zone. |
*/ |
zone = find_free_zone_lock(order, pzone); |
|
/* If no memory, reclaim some slab memory, |
if it does not help, reclaim all */ |
if (!zone && !(flags & FRAME_NO_RECLAIM)) { |
freed = slab_reclaim(0); |
if (freed) |
zone = find_free_zone_lock(order, pzone); |
if (!zone) { |
freed = slab_reclaim(SLAB_RECLAIM_ALL); |
if (freed) |
zone = find_free_zone_lock(order, pzone); |
} |
} |
if (!zone) { |
if (flags & FRAME_PANIC) |
panic("Can't allocate frame.\n"); |
|
/* |
* TODO: Sleep until frames are available again. |
*/ |
interrupts_restore(ipl); |
|
if (flags & FRAME_ATOMIC) { |
ASSERT(status != NULL); |
if (status) |
*status = FRAME_NO_MEMORY; |
return NULL; |
} |
|
panic("Sleep not implemented.\n"); |
goto loop; |
} |
|
v = zone_frame_alloc(zone, order); |
v += zone->base; |
|
spinlock_unlock(&zone->lock); |
interrupts_restore(ipl); |
|
if (status) |
*status = FRAME_OK; |
return v; |
} |
|
/** Free a frame. |
* |
* Find respective frame structure for supplied PFN. |
* Decrement frame reference count. |
* If it drops to zero, move the frame structure to free list. |
* |
* @param frame Frame number to be freed. |
*/ |
void frame_free(pfn_t pfn) |
{ |
ipl_t ipl; |
zone_t *zone; |
|
ipl = interrupts_disable(); |
|
/* |
* First, find host frame zone for addr. |
*/ |
zone = find_zone_and_lock(pfn,NULL); |
ASSERT(zone); |
|
zone_frame_free(zone, pfn-zone->base); |
|
spinlock_unlock(&zone->lock); |
interrupts_restore(ipl); |
} |
|
/** Add reference to frame. |
* |
* Find respective frame structure for supplied PFN and |
* increment frame reference count. |
* |
* @param frame Frame no to be freed. |
*/ |
void frame_reference_add(pfn_t pfn) |
{ |
ipl_t ipl; |
zone_t *zone; |
frame_t *frame; |
|
ipl = interrupts_disable(); |
|
/* |
* First, find host frame zone for addr. |
*/ |
zone = find_zone_and_lock(pfn,NULL); |
ASSERT(zone); |
|
frame = &zone->frames[pfn-zone->base]; |
frame->refcount++; |
|
spinlock_unlock(&zone->lock); |
interrupts_restore(ipl); |
} |
|
/** Mark given range unavailable in frame zones */ |
void frame_mark_unavailable(pfn_t start, count_t count) |
{ |
int i; |
zone_t *zone; |
int prefzone = 0; |
|
for (i=0; i < count; i++) { |
zone = find_zone_and_lock(start+i,&prefzone); |
if (!zone) /* PFN not found */ |
continue; |
zone_mark_unavailable(zone, start+i-zone->base); |
|
spinlock_unlock(&zone->lock); |
} |
} |
|
/** Initialize physical memory management |
* |
* Initialize physical memory managemnt. |
*/ |
void frame_init(void) |
{ |
if (config.cpu_active == 1) { |
zones.count = 0; |
spinlock_initialize(&zones.lock,"zones_glob_lock"); |
} |
/* Tell the architecture to create some memory */ |
frame_arch_init(); |
if (config.cpu_active == 1) { |
pfn_t firstframe = ADDR2PFN(KA2PA(config.base)); |
pfn_t lastframe = ADDR2PFN(KA2PA(config.base+config.kernel_size)); |
frame_mark_unavailable(firstframe,lastframe-firstframe+1); |
|
count_t i; |
for (i = 0; i < init.cnt; i++) |
frame_mark_unavailable(ADDR2PFN(KA2PA(init.tasks[i].addr)), SIZE2FRAMES(init.tasks[i].size)); |
|
/* Black list first frame, as allocating NULL would |
* fail on some places */ |
frame_mark_unavailable(0, 1); |
} |
} |
|
|
|
/** Prints list of zones |
* |
*/ |
void zone_print_list(void) { |
zone_t *zone = NULL; |
int i; |
ipl_t ipl; |
|
ipl = interrupts_disable(); |
spinlock_lock(&zones.lock); |
printf("# Base address\tFree Frames\tBusy Frames\n"); |
printf(" ------------\t-----------\t-----------\n"); |
for (i = 0; i < zones.count; i++) { |
zone = zones.info[i]; |
spinlock_lock(&zone->lock); |
printf("%d: %.*p \t%10zd\t%10zd\n", i, sizeof(__address) * 2, PFN2ADDR(zone->base), zone->free_count, zone->busy_count); |
spinlock_unlock(&zone->lock); |
} |
spinlock_unlock(&zones.lock); |
interrupts_restore(ipl); |
} |
|
/** Prints zone details |
* |
* @param base Zone base address OR zone number |
*/ |
void zone_print_one(int num) { |
zone_t *zone = NULL; |
ipl_t ipl; |
int i; |
|
ipl = interrupts_disable(); |
spinlock_lock(&zones.lock); |
|
for (i = 0; i < zones.count; i++) { |
if (i == num || PFN2ADDR(zones.info[i]->base) == num) { |
zone = zones.info[i]; |
break; |
} |
} |
if (!zone) { |
printf("Zone not found.\n"); |
goto out; |
} |
|
spinlock_lock(&zone->lock); |
printf("Memory zone information\n"); |
printf("Zone base address: %#.*p\n", sizeof(__address) * 2, PFN2ADDR(zone->base)); |
printf("Zone size: %zd frames (%zdK)\n", zone->count, ((zone->count) * FRAME_SIZE) >> 10); |
printf("Allocated space: %zd frames (%zdK)\n", zone->busy_count, (zone->busy_count * FRAME_SIZE) >> 10); |
printf("Available space: %zd (%zdK)\n", zone->free_count, (zone->free_count * FRAME_SIZE) >> 10); |
buddy_system_structure_print(zone->buddy_system, FRAME_SIZE); |
|
spinlock_unlock(&zone->lock); |
out: |
spinlock_unlock(&zones.lock); |
interrupts_restore(ipl); |
} |
|
|
/** @} |
*/ |
|