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/* Mmap management. */
/*
* 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/machine/memory.h>
#include <grub/i386/memory.h>
#include <grub/memory.h>
#include <grub/err.h>
#include <grub/misc.h>
#include <grub/mm.h>
#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
/* Context for grub_mmap_malign_and_register. */
struct grub_mmap_malign_and_register_ctx
{
grub_uint64_t align, size, highestlow;
};
/* Helper for grub_mmap_malign_and_register. */
static int
find_hook (grub_uint64_t start, grub_uint64_t rangesize,
grub_memory_type_t memtype, void *data)
{
struct grub_mmap_malign_and_register_ctx *ctx = data;
grub_uint64_t end = start + rangesize;
if (memtype != GRUB_MEMORY_AVAILABLE)
return 0;
if (end > 0x100000)
end = 0x100000;
if (end > start + ctx->size
&& ctx->highestlow < ((end - ctx->size)
- ((end - ctx->size) & (ctx->align - 1))))
ctx->highestlow = (end - ctx->size)
- ((end - ctx->size) & (ctx->align - 1));
return 0;
}
void *
grub_mmap_malign_and_register (grub_uint64_t align, grub_uint64_t size,
int *handle, int type, int flags)
{
struct grub_mmap_malign_and_register_ctx ctx = {
.align = align,
.size = size,
.highestlow = 0
};
void *ret;
if (flags & GRUB_MMAP_MALLOC_LOW)
{
/* FIXME: use low-memory mm allocation once it's available. */
grub_mmap_iterate (find_hook, &ctx);
ret = (void *) (grub_addr_t) ctx.highestlow;
}
else
ret = grub_memalign (align, size);
if (! ret)
{
*handle = 0;
return 0;
}
*handle = grub_mmap_register ((grub_addr_t) ret, size, type);
if (! *handle)
{
grub_free (ret);
return 0;
}
return ret;
}
void
grub_mmap_free_and_unregister (int handle)
{
struct grub_mmap_region *cur;
grub_uint64_t addr;
for (cur = grub_mmap_overlays; cur; cur = cur->next)
if (cur->handle == handle)
break;
if (! cur)
return;
addr = cur->start;
grub_mmap_unregister (handle);
if (addr >= 0x100000)
grub_free ((void *) (grub_addr_t) addr);
}
#endif
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