From fa287b158099b5b2159ecbbcc4acb2d5dc6714cf Mon Sep 17 00:00:00 2001 From: Miao Yan Date: Wed, 20 Jan 2016 01:57:06 -0800 Subject: x86: qemu: add the ability to load and link ACPI tables from QEMU This patch adds the ability to load and link ACPI tables provided by QEMU. QEMU tells guests how to load and patch ACPI tables through its fw_cfg interface, by adding a firmware file 'etc/table-loader'. Guests are supposed to parse this file and execute corresponding QEMU commands. Signed-off-by: Miao Yan Reviewed-by: Bin Meng Tested-by: Bin Meng --- arch/x86/include/asm/fw_cfg.h | 61 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) (limited to 'arch/x86/include/asm/fw_cfg.h') diff --git a/arch/x86/include/asm/fw_cfg.h b/arch/x86/include/asm/fw_cfg.h index 2acf43e..e9450c6 100644 --- a/arch/x86/include/asm/fw_cfg.h +++ b/arch/x86/include/asm/fw_cfg.h @@ -47,11 +47,23 @@ enum qemu_fwcfg_items { FW_CFG_INVALID = 0xffff, }; +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, +}; + #define FW_CFG_FILE_SLOTS 0x10 #define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST + FW_CFG_FILE_SLOTS) #define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL) #define FW_CFG_MAX_FILE_PATH 56 +#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH #define QEMU_FW_CFG_SIGNATURE (('Q' << 24) | ('E' << 16) | ('M' << 8) | 'U') @@ -81,6 +93,55 @@ struct fw_cfg_dma_access { __be64 address; }; +struct bios_linker_entry { + __le32 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]; + __le32 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]; + __le32 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]; + __le32 offset; + __le32 start; + __le32 length; + } cksum; + + /* padding */ + char pad[124]; + }; +} __packed; + /** * Initialize QEMU fw_cfg interface */ -- cgit v1.1