diff options
author | Yang Zhang <yang.z.zhang@intel.com> | 2015-08-28 09:58:54 +0800 |
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committer | Yang Zhang <yang.z.zhang@intel.com> | 2015-09-01 12:44:00 +0800 |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/interface/efi/efi_umalloc.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/interface/efi/efi_umalloc.c')
-rw-r--r-- | qemu/roms/ipxe/src/interface/efi/efi_umalloc.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/interface/efi/efi_umalloc.c b/qemu/roms/ipxe/src/interface/efi/efi_umalloc.c new file mode 100644 index 000000000..356efaa6f --- /dev/null +++ b/qemu/roms/ipxe/src/interface/efi/efi_umalloc.c @@ -0,0 +1,104 @@ +/* + * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. + * + * This program 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 2 of the + * License, or any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <string.h> +#include <errno.h> +#include <assert.h> +#include <ipxe/umalloc.h> +#include <ipxe/efi/efi.h> + +/** @file + * + * iPXE user memory allocation API for EFI + * + */ + +/** Equivalent of NOWHERE for user pointers */ +#define UNOWHERE ( ~UNULL ) + +/** + * Reallocate external memory + * + * @v old_ptr Memory previously allocated by umalloc(), or UNULL + * @v new_size Requested size + * @ret new_ptr Allocated memory, or UNULL + * + * Calling realloc() with a new size of zero is a valid way to free a + * memory block. + */ +static userptr_t efi_urealloc ( userptr_t old_ptr, size_t new_size ) { + EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + EFI_PHYSICAL_ADDRESS phys_addr; + unsigned int new_pages, old_pages; + userptr_t new_ptr = UNOWHERE; + size_t old_size; + EFI_STATUS efirc; + int rc; + + /* Allocate new memory if necessary. If allocation fails, + * return without touching the old block. + */ + if ( new_size ) { + new_pages = ( EFI_SIZE_TO_PAGES ( new_size ) + 1 ); + if ( ( efirc = bs->AllocatePages ( AllocateAnyPages, + EfiBootServicesData, + new_pages, + &phys_addr ) ) != 0 ) { + rc = -EEFI ( efirc ); + DBG ( "EFI could not allocate %d pages: %s\n", + new_pages, strerror ( rc ) ); + return UNULL; + } + assert ( phys_addr != 0 ); + new_ptr = phys_to_user ( phys_addr + EFI_PAGE_SIZE ); + copy_to_user ( new_ptr, -EFI_PAGE_SIZE, + &new_size, sizeof ( new_size ) ); + DBG ( "EFI allocated %d pages at %llx\n", + new_pages, phys_addr ); + } + + /* Copy across relevant part of the old data region (if any), + * then free it. Note that at this point either (a) new_ptr + * is valid, or (b) new_size is 0; either way, the memcpy() is + * valid. + */ + if ( old_ptr && ( old_ptr != UNOWHERE ) ) { + copy_from_user ( &old_size, old_ptr, -EFI_PAGE_SIZE, + sizeof ( old_size ) ); + memcpy_user ( new_ptr, 0, old_ptr, 0, + ( (old_size < new_size) ? old_size : new_size )); + old_pages = ( EFI_SIZE_TO_PAGES ( old_size ) + 1 ); + phys_addr = user_to_phys ( old_ptr, -EFI_PAGE_SIZE ); + if ( ( efirc = bs->FreePages ( phys_addr, old_pages ) ) != 0 ){ + rc = -EEFI ( efirc ); + DBG ( "EFI could not free %d pages at %llx: %s\n", + old_pages, phys_addr, strerror ( rc ) ); + /* Not fatal; we have leaked memory but successfully + * allocated (if asked to do so). + */ + } + DBG ( "EFI freed %d pages at %llx\n", old_pages, phys_addr ); + } + + return new_ptr; +} + +PROVIDE_UMALLOC ( efi, urealloc, efi_urealloc ); |