| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.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) |
| { |
| // TODO: fill in |
| return 0; |
| } |
| |
| /* Param is usually EBX, ret in EAX */ |
| uint32_t smmstore_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->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->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 command: 0x%02x\n", command); |
| ret = SMMSTORE_RET_UNSUPPORTED; |
| break; |
| } |
| |
| return ret; |
| } |