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|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <commonlib/endian.h>
#include <commonlib/fsp.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 compilation 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/FspInfoHeader.h>
/* Restore original packing policy. */
#pragma pack(pop)
#include <commonlib/helpers.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#define FSP_DBG_LVL BIOS_NEVER
#define MASK_24BITS 0x00FFFFFF
/*
* 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));
}
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];
} __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 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 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 section_data_offset(const EFI_COMMON_SECTION_HEADER *csh)
{
if (csh_size(csh) == MASK_24BITS)
return sizeof(EFI_COMMON_SECTION_HEADER2);
else
return sizeof(EFI_COMMON_SECTION_HEADER);
}
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 & MASK_24BITS;
/* 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 FSP_INFO_HEADER *fsp_get_info_hdr(void *fsp, size_t fih_offset)
{
EFI_FFS_FILE_HEADER *ffsfh;
EFI_COMMON_SECTION_HEADER *csh;
FSP_INFO_HEADER *fih;
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 NULL;
}
/* FSP_INFO_HEADER is located 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 NULL;
}
if (read_le8(&csh->Type) != EFI_SECTION_RAW) {
printk(BIOS_ERR, "FIH file should have raw section: %x\n",
read_le8(&csh->Type));
return NULL;
}
if (read_le32(&fih->Signature) != FSP_SIG) {
printk(BIOS_ERR, "Unexpected FIH signature: %08x\n",
read_le32(&fih->Signature));
return NULL;
}
return fih;
}
static int pe_relocate(uintptr_t new_addr, void *pe, void *fsp, size_t fih_off)
{
EFI_IMAGE_NT_HEADERS32 *peih;
EFI_IMAGE_DOS_HEADER *doshdr;
EFI_IMAGE_OPTIONAL_HEADER32 *ophdr;
FSP_INFO_HEADER *fih;
uint32_t roffset, rsize;
uint32_t offset;
uint8_t *pe_base = pe;
uint32_t image_base;
uint32_t img_base_off;
uint32_t delta;
doshdr = pe;
if (read_le16(&doshdr->e_magic) != EFI_IMAGE_DOS_SIGNATURE) {
printk(BIOS_ERR, "Invalid DOS Header/magic\n");
return -1;
}
peih = relative_offset(pe, doshdr->e_lfanew);
if (read_le32(&peih->Signature) != EFI_IMAGE_NT_SIGNATURE) {
printk(BIOS_ERR, "Invalid PE32 header\n");
return -1;
}
ophdr = &peih->OptionalHeader;
if (read_le16(&ophdr->Magic) != EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
printk(BIOS_ERR, "No support for non-PE32 images\n");
return -1;
}
fih = fsp_get_info_hdr(fsp, fih_off);
if (fih == NULL) {
printk(BIOS_ERR, "No Image base found for FSP PE32\n");
return -1;
}
image_base = read_le32(&fih->ImageBase);
printk(FSP_DBG_LVL, "FSP InfoHdr Image Base is %x\n", image_base);
delta = new_addr - image_base;
img_base_off = read_le32(&ophdr->ImageBase);
printk(FSP_DBG_LVL, "lfanew 0x%x, delta-0x%x, FSP Base 0x%x, NT32ImageBase 0x%x, offset 0x%x\n",
read_le32(&doshdr->e_lfanew),
delta, image_base, img_base_off,
(uint32_t)((uint8_t *)&ophdr->ImageBase - pe_base));
printk(FSP_DBG_LVL, "relocating PE32 image at addr - 0x%lx\n", new_addr);
rsize = read_le32(&ophdr->DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC].Size);
roffset = read_le32(&ophdr->DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
printk(FSP_DBG_LVL, "relocation table at offset-%x,size=%x\n", roffset, rsize);
// TODO - add support for PE32+ also
offset = roffset;
while (offset < (roffset + rsize)) {
uint32_t vaddr;
uint32_t rlen, rnum;
uint16_t *rdata;
uint32_t i;
EFI_IMAGE_DATA_DIRECTORY *relocd;
relocd = (void *)&pe_base[offset];
offset += sizeof(*relocd);
// Read relocation type, offset pairs
rlen = read_le32(&relocd->Size) - sizeof(*relocd);
rnum = rlen / sizeof(uint16_t);
vaddr = read_le32(&relocd->VirtualAddress);
rdata = (uint16_t *)&pe_base[offset];
printk(FSP_DBG_LVL, "\t%d Relocs for RVA %x\n", rnum, vaddr);
for (i = 0; i < rnum; i++) {
uint16_t roff = reloc_offset(rdata[i]);
uint16_t rtype = reloc_type(rdata[i]);
uint32_t aoff = vaddr + roff;
uint32_t val;
printk(FSP_DBG_LVL, "\t\treloc type %x offset %x aoff %x, base-0x%x\n",
rtype, roff, aoff, img_base_off);
switch (rtype) {
case EFI_IMAGE_REL_BASED_ABSOLUTE:
continue;
case EFI_IMAGE_REL_BASED_HIGHLOW:
val = read_le32(&pe_base[aoff]);
printk(FSP_DBG_LVL, "Adjusting %p %x -> %x\n",
&pe_base[aoff], val, val + delta);
write_le32(&pe_base[aoff], val + delta);
break;
case EFI_IMAGE_REL_BASED_DIR64:
printk(BIOS_ERR, "Unsupported DIR64\n");
break;
default:
printk(BIOS_ERR, "Unsupported relocation type %d\n",
rtype);
return -1;
}
}
offset += sizeof(*rdata) * rnum;
}
printk(FSP_DBG_LVL, "Adjust Image Base %x->%x\n",
img_base_off, img_base_off + delta);
img_base_off += delta;
write_le32(&ophdr->ImageBase, img_base_off);
return -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 relative offsets one needs to subtract fixup_offset
* from the encoded offsets. 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 ||
type == EFI_IMAGE_REL_BASED_DIR64) {
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 section_data_size(const EFI_COMMON_SECTION_HEADER *csh)
{
size_t section_size;
if (csh_size(csh) == MASK_24BITS)
section_size = read_le32(&SECTION2_SIZE(csh));
else
section_size = csh_size(csh);
return section_size - section_data_offset(csh);
}
static size_t ffs_file_size(const EFI_FFS_FILE_HEADER *ffsfh)
{
size_t size;
if (IS_FFS_FILE2(ffsfh)) {
/*
* this cast is needed with UEFI 2.6 headers in order
* to read the UINT32 value that FFS_FILE2_SIZE converts
* the return into
*/
uint32_t file2_size = FFS_FILE2_SIZE(ffsfh);
size = read_le32(&file2_size);
} 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));
}
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));
printk(FSP_DBG_LVL, "Updated FSP InfoHdr Image Base to %x\n",
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;
void *section_data;
size_t section_offset;
uintptr_t section_addr;
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 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.
*/
section_offset = offset + data_offset;
section_addr = new_addr + section_offset;
section_data = relative_offset(fsp, section_offset);
if (read_le8(&csh->Type) == EFI_SECTION_TE) {
printk(FSP_DBG_LVL, "TE image at offset %zx\n",
section_offset);
te_relocate(section_addr, section_data);
} else if (read_le8(&csh->Type) == EFI_SECTION_PE32) {
printk(FSP_DBG_LVL, "PE32 image at offset %zx\n",
section_offset);
pe_relocate(new_addr, section_data, fsp, *fih_offset);
}
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 fsp_component_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);
}
ssize_t fsp1_1_relocate(uintptr_t new_addr, void *fsp, size_t size)
{
return fsp_component_relocate(new_addr, fsp, size);
}
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