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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/core/memblock.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/core/memblock.c')
-rw-r--r-- | qemu/roms/ipxe/src/core/memblock.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/core/memblock.c b/qemu/roms/ipxe/src/core/memblock.c new file mode 100644 index 000000000..1fd89b871 --- /dev/null +++ b/qemu/roms/ipxe/src/core/memblock.c @@ -0,0 +1,81 @@ +/* + * Copyright (C) 2012 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 (at your option) 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 ); + +/** @file + * + * Largest memory block + * + */ + +#include <stdint.h> +#include <ipxe/uaccess.h> +#include <ipxe/io.h> +#include <ipxe/memblock.h> + +/** + * Find largest usable memory region + * + * @ret start Start of region + * @ret len Length of region + */ +size_t largest_memblock ( userptr_t *start ) { + struct memory_map memmap; + struct memory_region *region; + physaddr_t max = ~( ( physaddr_t ) 0 ); + physaddr_t region_start; + physaddr_t region_end; + size_t region_len; + unsigned int i; + size_t len = 0; + + /* Avoid returning uninitialised data on error */ + *start = UNULL; + + /* Scan through all memory regions */ + get_memmap ( &memmap ); + for ( i = 0 ; i < memmap.count ; i++ ) { + region = &memmap.regions[i]; + DBG ( "Considering [%llx,%llx)\n", region->start, region->end ); + + /* Truncate block to maximum physical address */ + if ( region->start > max ) { + DBG ( "...starts after maximum address %lx\n", max ); + continue; + } + region_start = region->start; + if ( region->end > max ) { + DBG ( "...end truncated to maximum address %lx\n", max); + region_end = 0; /* =max, given the wraparound */ + } else { + region_end = region->end; + } + region_len = ( region_end - region_start ); + + /* Use largest block */ + if ( region_len > len ) { + DBG ( "...new best block found\n" ); + *start = phys_to_user ( region_start ); + len = region_len; + } + } + + return len; +} |