diff options
Diffstat (limited to 'grub-core/mmap/i386/mmap.c')
-rw-r--r-- | grub-core/mmap/i386/mmap.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/grub-core/mmap/i386/mmap.c b/grub-core/mmap/i386/mmap.c new file mode 100644 index 0000000..ac45f70 --- /dev/null +++ b/grub-core/mmap/i386/mmap.c @@ -0,0 +1,113 @@ +/* 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 |