diff options
Diffstat (limited to 'src/drivers/smmstore/ramstage.c')
-rw-r--r-- | src/drivers/smmstore/ramstage.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/drivers/smmstore/ramstage.c b/src/drivers/smmstore/ramstage.c new file mode 100644 index 0000000000..ef80e221bc --- /dev/null +++ b/src/drivers/smmstore/ramstage.c @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <bootstate.h> +#include <cpu/x86/smm.h> +#include <commonlib/helpers.h> +#include <commonlib/region.h> +#include <console/console.h> +#include <smmstore.h> +#include <types.h> +#include <cbmem.h> + +static struct smmstore_params_info info; + +void lb_smmstorev2(struct lb_header *header) +{ + struct lb_record *rec; + struct lb_smmstorev2 *store; + const struct cbmem_entry *e; + + e = cbmem_entry_find(CBMEM_ID_SMM_COMBUFFER); + if (!e) + return; + + rec = lb_new_record(header); + store = (struct lb_smmstorev2 *)rec; + + store->tag = LB_TAG_SMMSTOREV2; + store->size = sizeof(*store); + store->com_buffer = (uintptr_t)cbmem_entry_start(e); + store->com_buffer_size = cbmem_entry_size(e); + store->mmap_addr = info.mmap_addr; + store->num_blocks = info.num_blocks; + store->block_size = info.block_size; + store->apm_cmd = APM_CNT_SMMSTORE; +} + +static void init_store(void *unused) +{ + struct smmstore_params_init args; + uint32_t eax = ~0; + uint32_t ebx; + + if (smmstore_get_info(&info) < 0) { + printk(BIOS_INFO, "SMMSTORE: Failed to get meta data\n"); + return; + } + + void *ptr = cbmem_add(CBMEM_ID_SMM_COMBUFFER, info.block_size); + if (!ptr) { + printk(BIOS_ERR, "SMMSTORE: Failed to add com buffer\n"); + return; + } + + args.com_buffer = (uintptr_t)ptr; + args.com_buffer_size = info.block_size; + ebx = (uintptr_t)&args; + + printk(BIOS_INFO, "SMMSTORE: Setting up SMI handler\n"); + + /* Issue SMI using APM to update the com buffer and to lock the SMMSTORE */ + __asm__ __volatile__ ( + "outb %%al, %%dx" + : "=a" (eax) + : "a" ((SMMSTORE_CMD_INIT << 8) | APM_CNT_SMMSTORE), + "b" (ebx), + "d" (APM_CNT) + : "memory"); + + if (eax != SMMSTORE_RET_SUCCESS) { + printk(BIOS_ERR, "SMMSTORE: Failed to install com buffer\n"); + return; + } +} + +/* The SMI APM handler is installed at DEV_INIT phase */ +BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_EXIT, init_store, NULL); |