/* * This file is part of the coreboot project. * * Copyright (C) 2013 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include "vboot_context.h" #include "vboot_handoff.h" static void vboot_wrapper(struct vboot_context *context); DEFINE_RMODULE_HEADER(vboot_wrapper_header, vboot_wrapper, RMODULE_TYPE_VBOOT); /* Keep a global context pointer around for the callbacks to use. */ static struct vboot_context *gcontext; /* The FW areas consist of multiple components. At the beginning of * each area is the number of total compoments as well as the size and * offset for each component. One needs to caculate the total size of the * signed firmware region based off of the embedded metadata. */ #define MAX_NUM_COMPONENTS 20 struct component_entry { uint32_t offset; uint32_t size; } __attribute__((packed)); struct components { uint32_t num_components; struct component_entry entries[0]; } __attribute__((packed)); static void parse_component(const struct components *components, int num, struct firmware_component *fw) { const char *base; if (num >= components->num_components) return; /* Offsets are relative to the stat of the book keeping structure. */ base = (void *)components; fw->address = (uint32_t)&base[components->entries[num].offset]; fw->size = (uint32_t)components->entries[num].size; } static void vboot_wrapper(struct vboot_context *context) { int i; VbError_t res; const struct components *components; gcontext = context; VbExDebug("Calling VbInit()\n"); res = VbInit(context->cparams, &context->handoff->init_params); VbExDebug("VbInit() returned 0x%08x\n", res); if (res != VBERROR_SUCCESS) return; VbExDebug("Calling VbSelectFirmware()\n"); res = VbSelectFirmware(context->cparams, context->fparams); VbExDebug("VbSelectFirmware() returned 0x%08x\n", res); if (res != VBERROR_SUCCESS) return; /* Fix up the handoff structure. */ context->handoff->selected_firmware = context->fparams->selected_firmware; /* Parse out the components for downstream consumption. */ if (context->handoff->selected_firmware == VB_SELECT_FIRMWARE_A) components = (void *)context->fw_a; else if (context->handoff->selected_firmware == VB_SELECT_FIRMWARE_B) components = (void *)context->fw_b; else return; for (i = 0; i < MAX_PARSED_FW_COMPONENTS; i++) { parse_component(components, i, &context->handoff->components[i]); } } void VbExError(const char *format, ...) { va_list args; va_start(args, format); gcontext->log_msg(format, args); va_end(args); gcontext->fatal_error(); } void VbExDebug(const char *format, ...) { va_list args; va_start(args, format); gcontext->log_msg(format, args); va_end(args); } uint64_t VbExGetTimer(void) { return rdtscll(); } VbError_t VbExNvStorageRead(uint8_t *buf) { gcontext->read_vbnv(buf); return VBERROR_SUCCESS; } VbError_t VbExNvStorageWrite(const uint8_t *buf) { gcontext->save_vbnv(buf); return VBERROR_SUCCESS; } extern char _heap[]; extern char _eheap[]; static char *heap_current; static int heap_size; void *VbExMalloc(size_t size) { void *ptr; if (heap_current == NULL) { heap_current = &_heap[0]; heap_size = &_eheap[0] - &_heap[0]; VbExDebug("vboot heap: %p 0x%08x bytes\n", heap_current, heap_size); } if (heap_size < size) { VbExError("vboot heap request cannot be fulfilled. " "0x%08x available, 0x%08x requested\n", heap_size, size); } ptr = heap_current; heap_size -= size; heap_current += size; return ptr; } void VbExFree(void *ptr) { /* Leak all memory. */ } /* vboot doesn't expose these through the vboot_api.h, but they are needed. * coreboot requires declarations so provide them to avoid compiler errors. */ int Memcmp(const void *src1, const void *src2, size_t n); void *Memcpy(void *dest, const void *src, uint64_t n); void *Memset(void *dest, const uint8_t c, uint64_t n); int Memcmp(const void *src1, const void *src2, size_t n) { return memcmp(src1, src2, n); } void *Memcpy(void *dest, const void *src, uint64_t n) { return memcpy(dest, src, n); } void *Memset(void *dest, const uint8_t c, uint64_t n) { return memset(dest, c, n); } VbError_t VbExHashFirmwareBody(VbCommonParams *cparams, uint32_t firmware_index) { uint8_t *data; uint32_t size; uint32_t data_size; struct components *components; uint32_t i; switch (firmware_index) { case VB_SELECT_FIRMWARE_A: data = gcontext->fw_a; size = gcontext->fw_a_size; break; case VB_SELECT_FIRMWARE_B: data = gcontext->fw_b; size = gcontext->fw_b_size; break; default: return VBERROR_UNKNOWN; } components = (void *)data; data_size = sizeof(struct components); if (components->num_components > MAX_NUM_COMPONENTS) return VBERROR_UNKNOWN; data_size += components->num_components * sizeof(struct component_entry); for (i = 0; i < components->num_components; i++) data_size += ALIGN(components->entries[i].size, 4); if (size < data_size) return VBERROR_UNKNOWN; VbUpdateFirmwareBodyHash(cparams, data, data_size); return VBERROR_SUCCESS; } VbError_t VbExTpmInit(void) { if (gcontext->tis_init()) return VBERROR_UNKNOWN; return VbExTpmOpen(); } VbError_t VbExTpmClose(void) { if (gcontext->tis_close()) return VBERROR_UNKNOWN; return VBERROR_SUCCESS; } VbError_t VbExTpmOpen(void) { if (gcontext->tis_open()) return VBERROR_UNKNOWN; return VBERROR_SUCCESS; } VbError_t VbExTpmSendReceive(const uint8_t *request, uint32_t request_length, uint8_t *response, uint32_t *response_length) { if (gcontext->tis_sendrecv(request, request_length, response, response_length)) return VBERROR_UNKNOWN; return VBERROR_SUCCESS; }