diff options
Diffstat (limited to 'src/commonlib')
| -rw-r--r-- | src/commonlib/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/commonlib/fsp1_1_relocate.c | 540 | ||||
| -rw-r--r-- | src/commonlib/include/commonlib/fsp1_1.h | 48 |
3 files changed, 590 insertions, 0 deletions
diff --git a/src/commonlib/Makefile.inc b/src/commonlib/Makefile.inc index 70a9b1ad7b..929bf8edc0 100644 --- a/src/commonlib/Makefile.inc +++ b/src/commonlib/Makefile.inc @@ -8,3 +8,5 @@ verstage-y += region.c romstage-y += region.c ramstage-y += region.c smm-y += region.c + +ramstage-$(CONFIG_PLATFORM_USES_FSP1_1) += fsp1_1_relocate.c diff --git a/src/commonlib/fsp1_1_relocate.c b/src/commonlib/fsp1_1_relocate.c new file mode 100644 index 0000000000..994da09409 --- /dev/null +++ b/src/commonlib/fsp1_1_relocate.c @@ -0,0 +1,540 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 Google Inc + * + * 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; version 2 of the License. + * + * 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. + */ + +#include <console/console.h> +#include <commonlib/endian.h> +#include <commonlib/fsp1_1.h> +#include <commonlib/helpers.h> +#include <stdlib.h> +#include <stdint.h> +#include <string.h> + +#define FSP_DBG_LVL BIOS_NEVER + +/* + * UEFI defines everything as little endian. However, this piece of code + * can be integrated in a userland tool. That tool could be on a big endian + * machine so one needs to access the fields within UEFI structures using + * endian-aware accesses. + */ + +/* Return 0 if equal. Non-zero if not equal. */ +static int guid_compare(const EFI_GUID *le_guid, const EFI_GUID *native_guid) +{ + if (read_le32(&le_guid->Data1) != native_guid->Data1) + return 1; + if (read_le16(&le_guid->Data2) != native_guid->Data2) + return 1; + if (read_le16(&le_guid->Data3) != native_guid->Data3) + return 1; + return memcmp(le_guid->Data4, native_guid->Data4, + ARRAY_SIZE(le_guid->Data4)); +} + +/* Provide this for symmetry when accessing UEFI fields. */ +static inline uint8_t le8toh(uint8_t byte) +{ + return byte; +} + +static const EFI_GUID ffs2_guid = EFI_FIRMWARE_FILE_SYSTEM2_GUID; +static const EFI_GUID fih_guid = FSP_INFO_HEADER_GUID; + +struct fsp_patch_table { + uint32_t signature; + uint16_t header_length; + uint8_t header_revision; + uint8_t reserved; + uint32_t patch_entry_num; + uint32_t patch_entries[0]; +} __attribute__((packed)); + +#define FSPP_SIG 0x50505346 + +static void *relative_offset(void *base, ssize_t offset) +{ + uintptr_t loc; + + loc = (uintptr_t)base; + loc += offset; + + return (void *)loc; +} + +static uint32_t *fspp_reloc(void *fsp, size_t fsp_size, uint32_t e) +{ + size_t offset; + + /* Offsets live in bits 23:0. */ + offset = e & 0xffffff; + + /* If bit 31 is set then the offset is considered a negative value + * relative to the end of the image using 16MiB as the offset's + * reference. */ + if (e & (1 << 31)) + offset = fsp_size - (16 * MiB - offset); + + /* Determine if offset falls within fsp_size for a 32 bit relocation. */ + if (offset > fsp_size - sizeof(uint32_t)) + return NULL; + + return relative_offset(fsp, offset); +} + +static int reloc_type(uint16_t reloc_entry) +{ + /* Reloc type in upper 4 bits */ + return reloc_entry >> 12; +} + +static size_t reloc_offset(uint16_t reloc_entry) +{ + /* Offsets are in low 12 bits. */ + return reloc_entry & ((1 << 12) - 1); +} + +static int te_relocate(uintptr_t new_addr, void *te) +{ + EFI_TE_IMAGE_HEADER *teih; + EFI_IMAGE_DATA_DIRECTORY *relocd; + EFI_IMAGE_BASE_RELOCATION *relocb; + uintptr_t image_base; + size_t fixup_offset; + size_t num_relocs; + uint16_t *reloc; + size_t relocd_offset; + uint8_t *te_base; + uint32_t adj; + + teih = te; + + if (read_le16(&teih->Signature) != EFI_TE_IMAGE_HEADER_SIGNATURE) { + printk(BIOS_ERR, "TE Signature mismatch: %x vs %x\n", + read_le16(&teih->Signature), + EFI_TE_IMAGE_HEADER_SIGNATURE); + return -1; + } + + /* + * A TE image is created by converting a PE file. Because of this + * the offsets within the headers are off. In order to calculate + * the correct releative offets one needs to subtract fixup_offset + * from the encoded offets. Similarly, the linked address of the + * program is found by adding the fixup_offset to the ImageBase. + */ + fixup_offset = read_le16(&teih->StrippedSize); + fixup_offset -= sizeof(EFI_TE_IMAGE_HEADER); + /* Keep track of a base that is correctly adjusted so that offsets + * can be used directly. */ + te_base = te; + te_base -= fixup_offset; + + image_base = read_le64(&teih->ImageBase); + adj = new_addr - (image_base + fixup_offset); + + printk(FSP_DBG_LVL, "TE Image %p -> %p adjust value: %x\n", + (void *)image_base, (void *)new_addr, adj); + + /* Adjust ImageBase for consistency. */ + write_le64(&teih->ImageBase, (uint32_t)(image_base + adj)); + + relocd = &teih->DataDirectory[EFI_TE_IMAGE_DIRECTORY_ENTRY_BASERELOC]; + + relocd_offset = 0; + /* Though the field name is VirtualAddress it's actually relative to + * the beginning of the image which is linked at ImageBase. */ + relocb = relative_offset(te, + read_le32(&relocd->VirtualAddress) - fixup_offset); + while (relocd_offset < read_le32(&relocd->Size)) { + size_t rva_offset = read_le32(&relocb->VirtualAddress); + + printk(FSP_DBG_LVL, "Relocs for RVA offset %zx\n", rva_offset); + num_relocs = read_le32(&relocb->SizeOfBlock) - sizeof(*relocb); + num_relocs /= sizeof(uint16_t); + reloc = relative_offset(relocb, sizeof(*relocb)); + + printk(FSP_DBG_LVL, "Num relocs in block: %zx\n", num_relocs); + + while (num_relocs > 0) { + uint16_t reloc_val = read_le16(reloc); + int type = reloc_type(reloc_val); + size_t offset = reloc_offset(reloc_val); + + printk(FSP_DBG_LVL, "reloc type %x offset %zx\n", + type, offset); + + if (type == EFI_IMAGE_REL_BASED_HIGHLOW) { + uint32_t *reloc_addr; + uint32_t val; + + offset += rva_offset; + reloc_addr = (void *)&te_base[offset]; + val = read_le32(reloc_addr); + + printk(FSP_DBG_LVL, "Adjusting %p %x -> %x\n", + reloc_addr, val, val + adj); + write_le32(reloc_addr, val + adj); + } else if (type != EFI_IMAGE_REL_BASED_ABSOLUTE) { + printk(BIOS_ERR, "Unknown reloc type: %x\n", + type); + return -1; + } + num_relocs--; + reloc++; + } + + /* Track consumption of relocation directory contents. */ + relocd_offset += read_le32(&relocb->SizeOfBlock); + /* Get next relocation block to process. */ + relocb = relative_offset(relocb, + read_le32(&relocb->SizeOfBlock)); + } + + return 0; +} + +static size_t csh_size(const EFI_COMMON_SECTION_HEADER *csh) +{ + size_t size; + + /* Unpack the array into a type that can be used. */ + size = 0; + size |= read_le8(&csh->Size[0]) << 0; + size |= read_le8(&csh->Size[1]) << 8; + size |= read_le8(&csh->Size[2]) << 16; + + return size; +} + +static size_t section_data_offset(const EFI_COMMON_SECTION_HEADER *csh) +{ + if (csh_size(csh) == 0x00ffffff) + return sizeof(EFI_COMMON_SECTION_HEADER2); + else + return sizeof(EFI_COMMON_SECTION_HEADER); +} + +static size_t section_data_size(const EFI_COMMON_SECTION_HEADER *csh) +{ + size_t section_size; + + if (csh_size(csh) == 0x00ffffff) + section_size = read_le32(&SECTION2_SIZE(csh)); + else + section_size = csh_size(csh); + + return section_size - section_data_offset(csh); +} + +static size_t file_section_offset(const EFI_FFS_FILE_HEADER *ffsfh) +{ + if (IS_FFS_FILE2(ffsfh)) + return sizeof(EFI_FFS_FILE_HEADER2); + else + return sizeof(EFI_FFS_FILE_HEADER); +} + +static size_t ffs_file_size(const EFI_FFS_FILE_HEADER *ffsfh) +{ + size_t size; + + if (IS_FFS_FILE2(ffsfh)) + size = read_le32(&FFS_FILE2_SIZE(ffsfh)); + else { + size = read_le8(&ffsfh->Size[0]) << 0; + size |= read_le8(&ffsfh->Size[1]) << 8; + size |= read_le8(&ffsfh->Size[2]) << 16; + } + return size; +} + +static int relocate_patch_table(void *fsp, size_t size, size_t offset, + ssize_t adjustment) +{ + struct fsp_patch_table *table; + size_t num; + size_t num_entries; + + table = relative_offset(fsp, offset); + + if ((offset + sizeof(*table) > size) || + (read_le16(&table->header_length) + offset) > size) { + printk(BIOS_ERR, "FSPP not entirely contained in region.\n"); + return -1; + } + + num_entries = read_le32(&table->patch_entry_num); + printk(FSP_DBG_LVL, "FSPP relocs: %zx\n", num_entries); + + for (num = 0; num < num_entries; num++) { + uint32_t *reloc; + uint32_t reloc_val; + + reloc = fspp_reloc(fsp, size, + read_le32(&table->patch_entries[num])); + + if (reloc == NULL) { + printk(BIOS_ERR, "Ignoring FSPP entry: %x\n", + read_le32(&table->patch_entries[num])); + continue; + } + + reloc_val = read_le32(reloc); + printk(FSP_DBG_LVL, "Adjusting %p %x -> %x\n", + reloc, reloc_val, + (unsigned int)(reloc_val + adjustment)); + + write_le32(reloc, reloc_val + adjustment); + } + + return 0; +} + +static ssize_t relocate_remaining_items(void *fsp, size_t size, + uintptr_t new_addr, size_t fih_offset) +{ + EFI_FFS_FILE_HEADER *ffsfh; + EFI_COMMON_SECTION_HEADER *csh; + FSP_INFO_HEADER *fih; + ssize_t adjustment; + size_t offset; + + printk(FSP_DBG_LVL, "FSP_INFO_HEADER offset is %zx\n", fih_offset); + + if (fih_offset == 0) { + printk(BIOS_ERR, "FSP_INFO_HEADER offset is 0.\n"); + return -1; + } + + /* FSP_INFO_HEADER at first file in FV within first RAW section. */ + ffsfh = relative_offset(fsp, fih_offset); + fih_offset += file_section_offset(ffsfh); + csh = relative_offset(fsp, fih_offset); + fih_offset += section_data_offset(csh); + fih = relative_offset(fsp, fih_offset); + + if (guid_compare(&ffsfh->Name, &fih_guid)) { + printk(BIOS_ERR, "Bad FIH GUID.\n"); + return -1; + } + + if (read_le8(&csh->Type) != EFI_SECTION_RAW) { + printk(BIOS_ERR, "FIH file should have raw section: %x\n", + read_le8(&csh->Type)); + return -1; + } + + if (read_le32(&fih->Signature) != FSP_SIG) { + printk(BIOS_ERR, "Unexpected FIH signature: %08x\n", + read_le32(&fih->Signature)); + return -1; + } + + adjustment = (intptr_t)new_addr - read_le32(&fih->ImageBase); + + /* Update ImageBase to reflect FSP's new home. */ + write_le32(&fih->ImageBase, adjustment + read_le32(&fih->ImageBase)); + + /* Need to find patch table and adjust each entry. The tables + * following FSP_INFO_HEADER have a 32-bit signature and header + * length. The patch table is denoted as having a 'FSPP' signature; + * the table format doesn't follow the other tables. */ + offset = fih_offset + read_le32(&fih->HeaderLength); + while (offset + 2 * sizeof(uint32_t) <= size) { + uint32_t *table_headers; + + table_headers = relative_offset(fsp, offset); + + printk(FSP_DBG_LVL, "Checking offset %zx for 'FSPP'\n", + offset); + + if (read_le32(&table_headers[0]) != FSPP_SIG) { + offset += read_le32(&table_headers[1]); + continue; + } + + if (relocate_patch_table(fsp, size, offset, adjustment)) { + printk(BIOS_ERR, "FSPP relocation failed.\n"); + return -1; + } + + return fih_offset; + } + + printk(BIOS_ERR, "Could not find the FSP patch table.\n"); + return -1; +} + +static ssize_t relocate_fvh(uintptr_t new_addr, void *fsp, size_t fsp_size, + size_t fvh_offset, size_t *fih_offset) +{ + EFI_FIRMWARE_VOLUME_HEADER *fvh; + EFI_FFS_FILE_HEADER *ffsfh; + EFI_COMMON_SECTION_HEADER *csh; + size_t offset; + size_t file_offset; + size_t size; + size_t fv_length; + + offset = fvh_offset; + fvh = relative_offset(fsp, offset); + + if (read_le32(&fvh->Signature) != EFI_FVH_SIGNATURE) + return -1; + + fv_length = read_le64(&fvh->FvLength); + + printk(FSP_DBG_LVL, "FVH length: %zx Offset: %zx Mapping length: %zx\n", + fv_length, offset, fsp_size); + + if (fv_length + offset > fsp_size) + return -1; + + /* Parse only this FV. However, the algorithm uses offsets into the + * entire FSP region so make size include the starting offset. */ + size = fv_length + offset; + + if (guid_compare(&fvh->FileSystemGuid, &ffs2_guid)) { + printk(BIOS_ERR, "FVH not an FFS2 type.\n"); + return -1; + } + + if (read_le16(&fvh->ExtHeaderOffset) != 0) { + EFI_FIRMWARE_VOLUME_EXT_HEADER *fveh; + + offset += read_le16(&fvh->ExtHeaderOffset); + fveh = relative_offset(fsp, offset); + printk(FSP_DBG_LVL, "Extended Header Offset: %zx Size: %zx\n", + (size_t)read_le16(&fvh->ExtHeaderOffset), + (size_t)read_le32(&fveh->ExtHeaderSize)); + offset += read_le32(&fveh->ExtHeaderSize); + /* FFS files are 8 byte aligned after extended header. */ + offset = ALIGN_UP(offset, 8); + } else { + offset += read_le16(&fvh->HeaderLength); + } + + file_offset = offset; + while (file_offset + sizeof(*ffsfh) < size) { + offset = file_offset; + printk(FSP_DBG_LVL, "file offset: %zx\n", file_offset); + + /* First file and section should be FSP info header. */ + if (fih_offset != NULL && *fih_offset == 0) + *fih_offset = file_offset; + + ffsfh = relative_offset(fsp, file_offset); + + printk(FSP_DBG_LVL, "file type = %x\n", read_le8(&ffsfh->Type)); + printk(FSP_DBG_LVL, "file attribs = %x\n", + read_le8(&ffsfh->Attributes)); + + /* Exit FV relocation when empty space found */ + if (read_le8(&ffsfh->Type) == EFI_FV_FILETYPE_FFS_MAX) + break; + + /* Next file on 8 byte alignment. */ + file_offset += ffs_file_size(ffsfh); + file_offset = ALIGN_UP(file_offset, 8); + + /* Padding files have no section information. */ + if (read_le8(&ffsfh->Type) == EFI_FV_FILETYPE_FFS_PAD) + continue; + + offset += file_section_offset(ffsfh); + + while (offset + sizeof(*csh) < file_offset) { + size_t data_size; + size_t data_offset; + + csh = relative_offset(fsp, offset); + + printk(FSP_DBG_LVL, "section offset: %zx\n", offset); + printk(FSP_DBG_LVL, "section type: %x\n", + read_le8(&csh->Type)); + + data_size = section_data_size(csh); + data_offset = section_data_offset(csh); + + if (data_size + data_offset + offset > file_offset) { + printk(BIOS_ERR, "Section exceeds FV size.\n"); + return -1; + } + + /* + * The entire FSP 1.1 image can be thought of as one + * program with a single link address even though there + * are multiple TEs linked separately. The reason is + * that each TE is linked for XIP. So in order to + * relocate the TE properly we need to form the + * relocated address based on the TE offset within + * FSP proper. + */ + if (read_le8(&csh->Type) == EFI_SECTION_TE) { + void *te; + size_t te_offset = offset + data_offset; + uintptr_t te_addr = new_addr + te_offset; + + printk(FSP_DBG_LVL, "TE image at offset %zx\n", + te_offset); + te = relative_offset(fsp, te_offset); + te_relocate(te_addr, te); + } + + offset += data_size + data_offset; + /* Sections are aligned to 4 bytes. */ + offset = ALIGN_UP(offset, 4); + } + } + + /* Return amount of buffer parsed: FV size. */ + return fv_length; +} + +ssize_t fsp1_1_relocate(uintptr_t new_addr, void *fsp, size_t size) +{ + size_t offset; + size_t fih_offset; + + offset = 0; + fih_offset = 0; + while (offset < size) { + ssize_t nparsed; + + /* Relocate each FV within the FSP region. The FSP_INFO_HEADER + * should only be located in the first FV. */ + if (offset == 0) + nparsed = relocate_fvh(new_addr, fsp, size, offset, + &fih_offset); + else + nparsed = relocate_fvh(new_addr, fsp, size, offset, + NULL); + + /* FV should be larger than 0 or failed to parse. */ + if (nparsed <= 0) { + printk(BIOS_ERR, "FV @ offset %zx relocation failed\n", + offset); + return -1; + } + + offset += nparsed; + } + + return relocate_remaining_items(fsp, size, new_addr, fih_offset); +} diff --git a/src/commonlib/include/commonlib/fsp1_1.h b/src/commonlib/include/commonlib/fsp1_1.h new file mode 100644 index 0000000000..8d8dcf03a6 --- /dev/null +++ b/src/commonlib/include/commonlib/fsp1_1.h @@ -0,0 +1,48 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 Google Inc. + * + * 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; version 2 of the License. + * + * 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. + */ + +#ifndef _COMMONLIB_FSP1_1_H_ +#define _COMMONLIB_FSP1_1_H_ + +#include <stddef.h> +#include <stdint.h> + +/* + * Intel's code does not have a handle on changing global packing state. + * Therefore, one needs to protect against packing policies that are set + * globally for a compliation unit just by including a header file. + */ +#pragma pack(push) + +/* Default bind FSP 1.1 API to edk2 UEFI 2.4 types. */ +#include <vendorcode/intel/edk2/uefi_2.4/uefi_types.h> + +#include <vendorcode/intel/fsp/fsp1_1/IntelFspPkg/Include/FspApi.h> +#include <vendorcode/intel/fsp/fsp1_1/IntelFspPkg/Include/FspInfoHeader.h> + +/* Restore original packing policy. */ +#pragma pack(pop) + +/* + * Relocate FSP held within buffer defined by size to new_addr. Returns < 0 + * on error, offset to FSP_INFO_HEADER on success. + */ +ssize_t fsp1_1_relocate(uintptr_t new_addr, void *fsp, size_t size); + +#endif |