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grub/lib/relocator.c
Vladimir 'phcoder' Serbinenko def6307401 Be paranoid in relocator allocations
2010-01-15 11:34:22 +01:00

633 lines
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/relocator.h>
#include <grub/relocator_private.h>
#include <grub/mm_private.h>
#include <grub/misc.h>
/* TODO: use more efficient data structures if necessary. */
/* FIXME: implement unload. */
/* FIXME: check memory map. */
/* FIXME: try to request memory from firmware. */
/* FIXME: sort chunk when programming relocators. */
struct grub_relocator *
grub_relocator_new (void)
{
struct grub_relocator *ret;
grub_cpu_relocator_init ();
ret = grub_zalloc (sizeof (struct grub_relocator));
if (!ret)
return NULL;
ret->postchunks = ~(grub_addr_t) 0;
ret->relocators_size = grub_relocator_jumper_size;
grub_dprintf ("relocator", "relocators_size=%lu\n",
(unsigned long) ret->relocators_size);
return ret;
}
static grub_mm_header_t
get_best_header (struct grub_relocator *rel,
grub_addr_t start, grub_addr_t end, grub_addr_t align,
grub_size_t size,
grub_mm_region_t rb, grub_mm_header_t *prev,
grub_addr_t *best_addr, int from_low_priv, int collisioncheck)
{
grub_mm_header_t h, hp;
grub_mm_header_t hb = NULL, hbp = NULL;
auto void try_addr (grub_addr_t allowable_start, grub_addr_t allowable_end);
void try_addr (grub_addr_t allowable_start, grub_addr_t allowable_end)
{
if (from_low_priv)
{
grub_addr_t addr;
addr = ALIGN_UP (allowable_start, align);
if (addr < start)
addr = ALIGN_UP (start, align);
if (collisioncheck)
while (1)
{
struct grub_relocator_chunk *chunk;
for (chunk = rel->chunks; chunk; chunk = chunk->next)
if ((chunk->target <= addr
&& addr < chunk->target + chunk->size)
|| (chunk->target < addr + size
&& addr + size < chunk->target + chunk->size)
|| (addr <= chunk->target && chunk->target < addr + size)
|| (addr < chunk->target + chunk->size
&& chunk->target + chunk->size < addr + size))
{
grub_dprintf ("relocator",
"collision 0x%llx+0x%llx, 0x%llx+0x%llx\n",
(unsigned long long) chunk->target,
(unsigned long long) chunk->size,
(unsigned long long) addr,
(unsigned long long) size);
addr = ALIGN_UP (chunk->target + chunk->size, align);
break;
}
if (!chunk)
break;
}
if (allowable_end <= addr + size)
return;
if (addr > end)
return;
if (hb == NULL || *best_addr > addr)
{
hb = h;
hbp = hp;
*best_addr = addr;
grub_dprintf ("relocator", "picked %p/%lx\n", hb,
(unsigned long) addr);
}
}
else
{
grub_addr_t addr;
addr = ALIGN_DOWN (allowable_end - size, align);
if (addr > end)
addr = ALIGN_DOWN (end, align);
if (collisioncheck)
while (1)
{
struct grub_relocator_chunk *chunk;
for (chunk = rel->chunks; chunk; chunk = chunk->next)
if ((chunk->target <= addr
&& addr < chunk->target + chunk->size)
|| (chunk->target < addr + size
&& addr + size < chunk->target + chunk->size)
|| (addr <= chunk->target && chunk->target < addr + size)
|| (addr < chunk->target + chunk->size
&& chunk->target + chunk->size < addr + size))
{
addr = ALIGN_DOWN (chunk->target - size, align);
break;
}
if (!chunk)
break;
}
if (allowable_start > addr)
return;
if (addr < start)
return;
if (hb == NULL || *best_addr < addr)
{
hb = h;
hbp = hp;
*best_addr = addr;
grub_dprintf ("relocator", "picked %p/%lx\n", hb,
(unsigned long) addr);
}
}
}
hp = rb->first;
h = hp->next;
grub_dprintf ("relocator", "alive\n");
do
{
grub_addr_t allowable_start, allowable_end;
allowable_start = (grub_addr_t) h;
allowable_end = (grub_addr_t) (h + h->size);
if (h->magic != GRUB_MM_FREE_MAGIC)
grub_fatal ("free magic is broken at %p: 0x%x", h, h->magic);
try_addr (allowable_start, allowable_end);
if ((grub_addr_t) h == (grub_addr_t) (rb + 1))
{
grub_dprintf ("relocator", "Trying region start 0x%llx\n",
(unsigned long long) (allowable_start
- sizeof (*rb) - rb->pre_size));
try_addr (allowable_start - sizeof (*rb) - rb->pre_size,
allowable_end - sizeof (*rb));
}
hp = h;
h = hp->next;
}
while (hp && hp != rb->first);
*prev = hbp;
return hb;
}
static int
malloc_in_range (struct grub_relocator *rel,
grub_addr_t start, grub_addr_t end, grub_addr_t align,
grub_size_t size, grub_addr_t *res, int from_low_priv,
int collisioncheck)
{
grub_mm_region_t rb, rbp;
grub_mm_header_t hb = NULL, hbp = NULL;
grub_addr_t best_addr;
again:
rb = NULL, rbp = NULL;
{
grub_mm_region_t r, rp;
for (rp = NULL, r = grub_mm_base; r; rp = r, r = r->next)
{
grub_dprintf ("relocator", "region %p. %d %d %d %d\n", r,
(grub_addr_t) r + r->size + sizeof (*r) >= start,
(grub_addr_t) r < end, r->size + sizeof (*r) >= size,
(rb == NULL || (from_low_priv ? rb > r : rb < r)));
if ((grub_addr_t) r + r->size + sizeof (*r) >= start
&& (grub_addr_t) r < end && r->size + sizeof (*r) >= size
&& (rb == NULL || (from_low_priv ? rb > r : rb < r)))
{
rb = r;
rbp = rp;
}
}
}
if (!rb)
{
grub_dprintf ("relocator", "no suitable region found\n");
return 0;
}
grub_dprintf ("relocator", "trying region %p - %p\n", rb, rb + rb->size + 1);
hb = get_best_header (rel, start, end, align, size, rb, &hbp, &best_addr,
from_low_priv, collisioncheck);
grub_dprintf ("relocator", "best header %p/%p/%lx\n", hb, hbp,
(unsigned long) best_addr);
if (!hb)
{
if (from_low_priv)
start = (grub_addr_t) (rb + rb->size + sizeof (*rb));
else
end = (grub_addr_t) rb - 1;
goto again;
}
/* Special case: relocating region start. */
if (best_addr < (grub_addr_t) hb)
{
grub_addr_t newreg_start, newreg_raw_start = best_addr + size;
grub_addr_t newreg_size, newreg_presize;
grub_mm_header_t new_header;
newreg_start = ALIGN_UP (newreg_raw_start, GRUB_MM_ALIGN);
newreg_presize = newreg_start - newreg_raw_start;
newreg_size = rb->size - (newreg_start - (grub_addr_t) rb);
if ((hb->size << GRUB_MM_ALIGN_LOG2) >= newreg_start
- (grub_addr_t) rb)
{
grub_mm_header_t newhnext = hb->next;
grub_size_t newhsize = ((hb->size << GRUB_MM_ALIGN_LOG2)
- (newreg_start
- (grub_addr_t) rb)) >> GRUB_MM_ALIGN_LOG2;
new_header = (void *) (newreg_start + sizeof (*rb));
if (newhnext == hb)
newhnext = new_header;
new_header->next = newhnext;
new_header->size = newhsize;
new_header->magic = GRUB_MM_FREE_MAGIC;
}
else
{
new_header = hb->next;
if (new_header == hb)
new_header = (void *) (newreg_start + sizeof (*rb));
}
{
struct grub_mm_header *newregfirst = rb->first;
struct grub_mm_region *newregnext = rb->next;
struct grub_mm_region *newreg = (void *) newreg_start;
hbp->next = new_header;
if (newregfirst == hb)
newregfirst = new_header;
newreg->first = newregfirst;
newreg->next = newregnext;
newreg->pre_size = newreg_presize;
newreg->size = newreg_size;
if (rbp)
rbp->next = newreg;
else
grub_mm_base = newreg;
{
grub_mm_header_t h = newreg->first, hp = NULL;
do
{
if ((void *) h < (void *) (newreg + 1))
grub_fatal ("Failed to adjust memory region: %p, %p, %p, %p, %p",
newreg, newreg->first, h, hp, hb);
hp = h;
h = h->next;
}
while (h != newreg->first);
}
}
*res = best_addr;
return 1;
}
{
struct grub_mm_header *foll = NULL;
if (ALIGN_UP (best_addr + size, GRUB_MM_ALIGN) + GRUB_MM_ALIGN
<= (grub_addr_t) (hb + hb->size))
{
foll = (void *) ALIGN_UP (best_addr + size, GRUB_MM_ALIGN);
foll->magic = GRUB_MM_FREE_MAGIC;
foll->size = hb->size - (foll - hb);
}
if (best_addr - (grub_addr_t) hb >= sizeof (*hb))
{
hb->size = ((best_addr - (grub_addr_t) hb) >> GRUB_MM_ALIGN_LOG2);
if (foll)
{
foll->next = hb;
hbp->next = foll;
if (rb->first == hb)
rb->first = foll;
}
}
else
{
if (foll)
foll->next = hb->next;
else
foll = hb->next;
hbp->next = foll;
if (rb->first == hb)
rb->first = foll;
if (rb->first == hb)
rb->first = (void *) (rb + 1);
}
*res = best_addr;
return 1;
}
}
static void
adjust_limits (struct grub_relocator *rel,
grub_addr_t *min_addr, grub_addr_t *max_addr,
grub_addr_t in_min, grub_addr_t in_max)
{
struct grub_relocator_chunk *chunk;
*min_addr = 0;
*max_addr = rel->postchunks;
/* Keep chunks in memory in the same order as they'll be after relocation. */
for (chunk = rel->chunks; chunk; chunk = chunk->next)
{
if (chunk->target > in_max && chunk->src < *max_addr
&& chunk->src < rel->postchunks)
*max_addr = chunk->src;
if (chunk->target + chunk->size <= in_min
&& chunk->src + chunk->size > *min_addr
&& chunk->src < rel->postchunks)
*min_addr = chunk->src + chunk->size;
}
}
grub_err_t
grub_relocator_alloc_chunk_addr (struct grub_relocator *rel, void **src,
grub_addr_t target, grub_size_t size)
{
struct grub_relocator_chunk *chunk;
grub_addr_t start;
grub_addr_t min_addr = 0, max_addr;
if (target > ~size)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "address is out of range");
adjust_limits (rel, &min_addr, &max_addr, target, target);
for (chunk = rel->chunks; chunk; chunk = chunk->next)
if ((chunk->target <= target && target < chunk->target + chunk->size)
|| (target <= chunk->target && chunk->target < target + size))
return grub_error (GRUB_ERR_BAD_ARGUMENT, "overlap detected");
chunk = grub_malloc (sizeof (struct grub_relocator_chunk));
if (!chunk)
return grub_errno;
grub_dprintf ("relocator",
"min_addr = 0x%llx, max_addr = 0x%llx, target = 0x%llx\n",
(unsigned long long) min_addr, (unsigned long long) max_addr,
(unsigned long long) target);
do
{
/* A trick to improve Linux allocation. */
#if defined (__i386__) || defined (__x86_64__)
if (target < 0x100000)
if (malloc_in_range (rel, rel->highestnonpostaddr, ~(grub_addr_t)0, 1,
size, &start, 0, 1))
{
if (rel->postchunks > start)
rel->postchunks = start;
break;
}
#endif
if (malloc_in_range (rel, target, max_addr, 1, size, &start, 1, 0))
break;
if (malloc_in_range (rel, min_addr, target, 1, size, &start, 0, 0))
break;
if (malloc_in_range (rel, rel->highestnonpostaddr, ~(grub_addr_t)0, 1,
size, &start, 0, 1))
{
if (rel->postchunks > start)
rel->postchunks = start;
break;
}
grub_dprintf ("relocator", "not allocated\n");
grub_free (chunk);
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of memory");
}
while (0);
grub_dprintf ("relocator", "allocated 0x%llx/0x%llx\n",
(unsigned long long) start, (unsigned long long) target);
if (rel->highestaddr < target + size)
rel->highestaddr = target + size;
if (rel->highestaddr < start + size)
rel->highestaddr = start + size;
if (start < rel->postchunks)
{
if (rel->highestnonpostaddr < target + size)
rel->highestnonpostaddr = target + size;
if (rel->highestnonpostaddr < start + size)
rel->highestnonpostaddr = start + size;
}
grub_dprintf ("relocator", "relocators_size=%ld\n",
(unsigned long) rel->relocators_size);
if (start < target)
rel->relocators_size += grub_relocator_backward_size;
if (start > target)
rel->relocators_size += grub_relocator_forward_size;
grub_dprintf ("relocator", "relocators_size=%ld\n",
(unsigned long) rel->relocators_size);
chunk->src = start;
chunk->target = target;
chunk->size = size;
chunk->next = rel->chunks;
rel->chunks = chunk;
grub_dprintf ("relocator", "cur = %p, next = %p\n", rel->chunks,
rel->chunks->next);
*src = (void *) start;
return GRUB_ERR_NONE;
}
grub_err_t
grub_relocator_alloc_chunk_align (struct grub_relocator *rel, void **src,
grub_addr_t *target,
grub_addr_t min_addr, grub_addr_t max_addr,
grub_size_t size, grub_size_t align,
int preference)
{
grub_addr_t min_addr2 = 0, max_addr2;
struct grub_relocator_chunk *chunk;
grub_addr_t start;
if (max_addr > ~size)
max_addr = ~size;
#ifdef GRUB_MACHINE_PCBIOS
if (min_addr < 0x1000)
min_addr = 0x1000;
#endif
grub_dprintf ("relocator", "chunks = %p\n", rel->chunks);
chunk = grub_malloc (sizeof (struct grub_relocator_chunk));
if (!chunk)
return grub_errno;
if (malloc_in_range (rel, min_addr, max_addr, align,
size, &start,
preference != GRUB_RELOCATOR_PREFERENCE_HIGH, 1))
{
grub_dprintf ("relocator", "allocated 0x%llx/0x%llx\n",
(unsigned long long) start, (unsigned long long) start);
grub_dprintf ("relocator", "chunks = %p\n", rel->chunks);
chunk->src = start;
chunk->target = start;
chunk->size = size;
chunk->next = rel->chunks;
rel->chunks = chunk;
*src = (void *) start;
*target = start;
return GRUB_ERR_NONE;
}
adjust_limits (rel, &min_addr2, &max_addr2, min_addr, max_addr);
grub_dprintf ("relocator", "Adjusted limits from %lx-%lx to %lx-%lx\n",
(unsigned long) min_addr, (unsigned long) max_addr,
(unsigned long) min_addr2, (unsigned long) max_addr2);
do
{
if (malloc_in_range (rel, min_addr2, max_addr2, align,
size, &start, 1, 1))
break;
if (malloc_in_range (rel, rel->highestnonpostaddr, ~(grub_addr_t)0, 1,
size, &start, 0, 1))
{
if (rel->postchunks > start)
rel->postchunks = start;
break;
}
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of memory");
}
while (0);
/* FIXME: check memory map. */
if (preference == GRUB_RELOCATOR_PREFERENCE_HIGH)
chunk->target = ALIGN_DOWN (max_addr, align);
else
chunk->target = ALIGN_UP (min_addr, align);
while (1)
{
struct grub_relocator_chunk *chunk2;
for (chunk2 = rel->chunks; chunk2; chunk2 = chunk2->next)
if ((chunk2->target <= chunk->target
&& chunk->target < chunk2->target + chunk2->size)
|| (chunk2->target <= chunk->target + size
&& chunk->target + size < chunk2->target + chunk2->size)
|| (chunk->target <= chunk2->target && chunk2->target
< chunk->target + size)
|| (chunk->target <= chunk2->target + chunk2->size
&& chunk2->target + chunk2->size < chunk->target + size))
{
if (preference == GRUB_RELOCATOR_PREFERENCE_HIGH)
chunk->target = ALIGN_DOWN (chunk2->target, align);
else
chunk->target = ALIGN_UP (chunk2->target + chunk2->size, align);
break;
}
if (!chunk2)
break;
}
if (start < chunk->target)
rel->relocators_size += grub_relocator_backward_size;
if (start > chunk->target)
rel->relocators_size += grub_relocator_forward_size;
chunk->src = start;
chunk->size = size;
chunk->next = rel->chunks;
rel->chunks = chunk;
grub_dprintf ("relocator", "cur = %p, next = %p\n", rel->chunks,
rel->chunks->next);
*src = (void *) start;
*target = chunk->target;
return GRUB_ERR_NONE;
}
void
grub_relocator_unload (struct grub_relocator *rel)
{
struct grub_relocator_chunk *chunk, *next;
if (!rel)
return;
for (chunk = rel->chunks; chunk; chunk = next)
{
grub_fatal ("Relocator unloading isn't implemented yet");
next = chunk->next;
grub_free (chunk);
}
}
grub_err_t
grub_relocator_prepare_relocs (struct grub_relocator *rel, grub_addr_t addr,
grub_addr_t *relstart)
{
struct grub_relocator_chunk *chunk;
grub_addr_t rels;
grub_addr_t rels0;
grub_dprintf ("relocator", "Preparing relocs (size=%ld)\n",
(unsigned long) rel->relocators_size);
if (!malloc_in_range (rel, 0, ~(grub_addr_t)0 - rel->relocators_size + 1,
grub_relocator_align,
rel->relocators_size, &rels0, 1, 1))
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of memory");
rels = rels0;
grub_dprintf ("relocator", "Relocs allocated\n");
for (chunk = rel->chunks; chunk; chunk = chunk->next)
{
grub_dprintf ("relocator", "chunk %p->%p\n",
(void *) chunk->src, (void *) chunk->target);
if (chunk->src < chunk->target)
{
grub_cpu_relocator_backward ((void *) rels,
(void *) chunk->src,
(void *) chunk->target,
chunk->size);
rels += grub_relocator_backward_size;
}
if (chunk->src > chunk->target)
{
grub_cpu_relocator_forward ((void *) rels,
(void *) chunk->src,
(void *) chunk->target,
chunk->size);
rels += grub_relocator_forward_size;
}
}
grub_cpu_relocator_jumper ((void *) rels, addr);
*relstart = rels0;
return GRUB_ERR_NONE;
}
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