/* SPDX-License-Identifier: GPL-2.0-only */ #include <console/console.h> #include <commonlib/region.h> #include <cpu/x86/smm.h> #include <smmstore.h> #include <stddef.h> #include <stdint.h> /* * Check that the given range is legal. * * Legal means: * - not pointing into SMRAM * * returns 0 on success, -1 on failure */ static int range_check(void *start, size_t size) { if (smm_points_to_smram(start, size)) return -1; return 0; } static uint32_t smmstorev1_exec(uint8_t command, void *param) { uint32_t ret = SMMSTORE_RET_FAILURE; switch (command) { case SMMSTORE_CMD_READ: { printk(BIOS_DEBUG, "Reading from SMM store\n"); struct smmstore_params_read *params = param; if (range_check(params, sizeof(*params)) != 0) break; if (range_check(params->buf, params->bufsize) != 0) break; if (smmstore_read_region(params->buf, ¶ms->bufsize) == 0) ret = SMMSTORE_RET_SUCCESS; break; } case SMMSTORE_CMD_APPEND: { printk(BIOS_DEBUG, "Appending into SMM store\n"); struct smmstore_params_append *params = param; if (range_check(params, sizeof(*params)) != 0) break; if (range_check(params->key, params->keysize) != 0) break; if (range_check(params->val, params->valsize) != 0) break; if (smmstore_append_data(params->key, params->keysize, params->val, params->valsize) == 0) ret = SMMSTORE_RET_SUCCESS; break; } case SMMSTORE_CMD_CLEAR: { if (smmstore_clear_region() == 0) ret = SMMSTORE_RET_SUCCESS; break; } default: printk(BIOS_DEBUG, "Unknown SMM store v1 command: 0x%02x\n", command); ret = SMMSTORE_RET_UNSUPPORTED; break; } return ret; } static uint32_t smmstorev2_exec(uint8_t command, void *param) { uint32_t ret = SMMSTORE_RET_FAILURE; switch (command) { case SMMSTORE_CMD_INIT: { printk(BIOS_DEBUG, "Init SMM store\n"); struct smmstore_params_init *params = param; if (range_check(params, sizeof(*params)) != 0) break; void *buf = (void *)(uintptr_t)params->com_buffer; if (range_check(buf, params->com_buffer_size) != 0) break; if (smmstore_init(buf, params->com_buffer_size) == 0) ret = SMMSTORE_RET_SUCCESS; break; } case SMMSTORE_CMD_RAW_READ: { printk(BIOS_DEBUG, "Raw read from SMM store, param = %p\n", param); struct smmstore_params_raw_read *params = param; if (range_check(params, sizeof(*params)) != 0) break; if (smmstore_rawread_region(params->block_id, params->bufoffset, params->bufsize) == 0) ret = SMMSTORE_RET_SUCCESS; break; } case SMMSTORE_CMD_RAW_WRITE: { printk(BIOS_DEBUG, "Raw write to SMM store, param = %p\n", param); struct smmstore_params_raw_write *params = param; if (range_check(params, sizeof(*params)) != 0) break; if (smmstore_rawwrite_region(params->block_id, params->bufoffset, params->bufsize) == 0) ret = SMMSTORE_RET_SUCCESS; break; } case SMMSTORE_CMD_RAW_CLEAR: { printk(BIOS_DEBUG, "Raw clear SMM store, param = %p\n", param); struct smmstore_params_raw_clear *params = param; if (range_check(params, sizeof(*params)) != 0) break; if (smmstore_rawclear_region(params->block_id) == 0) ret = SMMSTORE_RET_SUCCESS; break; } default: printk(BIOS_DEBUG, "Unknown SMM store v2 command: 0x%02x\n", command); ret = SMMSTORE_RET_UNSUPPORTED; break; } return ret; } uint32_t smmstore_exec(uint8_t command, void *param) { if (command != SMMSTORE_CMD_CLEAR && !param) return SMMSTORE_RET_FAILURE; if (CONFIG(SMMSTORE_V2)) return smmstorev2_exec(command, param); else return smmstorev1_exec(command, param); }