diff options
Diffstat (limited to 'qemu/hw/acpi/bios-linker-loader.c')
| -rw-r--r-- | qemu/hw/acpi/bios-linker-loader.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/qemu/hw/acpi/bios-linker-loader.c b/qemu/hw/acpi/bios-linker-loader.c deleted file mode 100644 index 5153ab151..000000000 --- a/qemu/hw/acpi/bios-linker-loader.c +++ /dev/null @@ -1,240 +0,0 @@ -/* Dynamic linker/loader of ACPI tables - * - * Copyright (C) 2013 Red Hat Inc - * - * Author: Michael S. Tsirkin <mst@redhat.com> - * - * 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, see <http://www.gnu.org/licenses/>. - */ - -#include "qemu/osdep.h" -#include "qemu-common.h" -#include "hw/acpi/bios-linker-loader.h" -#include "hw/nvram/fw_cfg.h" - -#include "qemu/bswap.h" - -/* - * Linker/loader is a paravirtualized interface that passes commands to guest. - * The commands can be used to request guest to - * - allocate memory chunks and initialize them from QEMU FW CFG files - * - link allocated chunks by storing pointer to one chunk into another - * - calculate ACPI checksum of part of the chunk and store into same chunk - */ -#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH - -struct BiosLinkerLoaderEntry { - uint32_t command; - union { - /* - * COMMAND_ALLOCATE - allocate a table from @alloc.file - * subject to @alloc.align alignment (must be power of 2) - * and @alloc.zone (can be HIGH or FSEG) requirements. - * - * Must appear exactly once for each file, and before - * this file is referenced by any other command. - */ - struct { - char file[BIOS_LINKER_LOADER_FILESZ]; - uint32_t align; - uint8_t zone; - } alloc; - - /* - * COMMAND_ADD_POINTER - patch the table (originating from - * @dest_file) at @pointer.offset, by adding a pointer to the table - * originating from @src_file. 1,2,4 or 8 byte unsigned - * addition is used depending on @pointer.size. - */ - struct { - char dest_file[BIOS_LINKER_LOADER_FILESZ]; - char src_file[BIOS_LINKER_LOADER_FILESZ]; - uint32_t offset; - uint8_t size; - } pointer; - - /* - * COMMAND_ADD_CHECKSUM - calculate checksum of the range specified by - * @cksum_start and @cksum_length fields, - * and then add the value at @cksum.offset. - * Checksum simply sums -X for each byte X in the range - * using 8-bit math. - */ - struct { - char file[BIOS_LINKER_LOADER_FILESZ]; - uint32_t offset; - uint32_t start; - uint32_t length; - } cksum; - - /* padding */ - char pad[124]; - }; -} QEMU_PACKED; -typedef struct BiosLinkerLoaderEntry BiosLinkerLoaderEntry; - -enum { - BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1, - BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2, - BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3, -}; - -enum { - BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1, - BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2, -}; - -/* - * bios_linker_loader_init: allocate a new linker file blob array. - * - * After initialization, linker commands can be added, and will - * be stored in the array. - */ -GArray *bios_linker_loader_init(void) -{ - return g_array_new(false, true /* clear */, 1); -} - -/* Free linker wrapper and return the linker array. */ -void *bios_linker_loader_cleanup(GArray *linker) -{ - return g_array_free(linker, false); -} - -/* - * bios_linker_loader_alloc: ask guest to load file into guest memory. - * - * @linker: linker file blob array - * @file: file to be loaded - * @alloc_align: required minimal alignment in bytes. Must be a power of 2. - * @alloc_fseg: request allocation in FSEG zone (useful for the RSDP ACPI table) - * - * Note: this command must precede any other linker command using this file. - */ -void bios_linker_loader_alloc(GArray *linker, - const char *file, - uint32_t alloc_align, - bool alloc_fseg) -{ - BiosLinkerLoaderEntry entry; - - assert(!(alloc_align & (alloc_align - 1))); - - memset(&entry, 0, sizeof entry); - strncpy(entry.alloc.file, file, sizeof entry.alloc.file - 1); - entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ALLOCATE); - entry.alloc.align = cpu_to_le32(alloc_align); - entry.alloc.zone = alloc_fseg ? BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG : - BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH; - - /* Alloc entries must come first, so prepend them */ - g_array_prepend_vals(linker, &entry, sizeof entry); -} - -/* - * bios_linker_loader_add_checksum: ask guest to add checksum of file data - * into (same) file at the specified pointer. - * - * Checksum calculation simply sums -X for each byte X in the range - * using 8-bit math (i.e. ACPI checksum). - * - * @linker: linker file blob array - * @file: file that includes the checksum to be calculated - * and the data to be checksummed - * @table: @file blob contents - * @start, @size: range of data to checksum - * @checksum: location of the checksum to be patched within file blob - * - * Notes: - * - checksum byte initial value must have been pushed into @table - * and reside at address @checksum. - * - @size bytes must have been pushed into @table and reside at address - * @start. - * - Guest calculates checksum of specified range of data, result is added to - * initial value at @checksum into copy of @file in Guest memory. - * - Range might include the checksum itself. - * - To avoid confusion, caller must always put 0x0 at @checksum. - * - @file must be loaded into Guest memory using bios_linker_loader_alloc - */ -void bios_linker_loader_add_checksum(GArray *linker, const char *file, - GArray *table, - void *start, unsigned size, - uint8_t *checksum) -{ - BiosLinkerLoaderEntry entry; - ptrdiff_t checksum_offset = (gchar *)checksum - table->data; - ptrdiff_t start_offset = (gchar *)start - table->data; - - assert(checksum_offset >= 0); - assert(start_offset >= 0); - assert(checksum_offset + 1 <= table->len); - assert(start_offset + size <= table->len); - assert(*checksum == 0x0); - - memset(&entry, 0, sizeof entry); - strncpy(entry.cksum.file, file, sizeof entry.cksum.file - 1); - entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM); - entry.cksum.offset = cpu_to_le32(checksum_offset); - entry.cksum.start = cpu_to_le32(start_offset); - entry.cksum.length = cpu_to_le32(size); - - g_array_append_vals(linker, &entry, sizeof entry); -} - -/* - * bios_linker_loader_add_pointer: ask guest to add address of source file - * into destination file at the specified pointer. - * - * @linker: linker file blob array - * @dest_file: destination file that must be changed - * @src_file: source file who's address must be taken - * @table: @dest_file blob contents array - * @pointer: location of the pointer to be patched within destination file blob - * @pointer_size: size of pointer to be patched, in bytes - * - * Notes: - * - @pointer_size bytes must have been pushed into @table - * and reside at address @pointer. - * - Guest address is added to initial value at @pointer - * into copy of @dest_file in Guest memory. - * e.g. to get start of src_file in guest memory, put 0x0 there - * to get address of a field at offset 0x10 in src_file, put 0x10 there - * - Both @dest_file and @src_file must be - * loaded into Guest memory using bios_linker_loader_alloc - */ -void bios_linker_loader_add_pointer(GArray *linker, - const char *dest_file, - const char *src_file, - GArray *table, void *pointer, - uint8_t pointer_size) -{ - BiosLinkerLoaderEntry entry; - ptrdiff_t offset = (gchar *)pointer - table->data; - - assert(offset >= 0); - assert(offset + pointer_size <= table->len); - - memset(&entry, 0, sizeof entry); - strncpy(entry.pointer.dest_file, dest_file, - sizeof entry.pointer.dest_file - 1); - strncpy(entry.pointer.src_file, src_file, - sizeof entry.pointer.src_file - 1); - entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_POINTER); - entry.pointer.offset = cpu_to_le32(offset); - entry.pointer.size = pointer_size; - assert(pointer_size == 1 || pointer_size == 2 || - pointer_size == 4 || pointer_size == 8); - - g_array_append_vals(linker, &entry, sizeof entry); -} |