cpu/x86/smm_module_loader.c: Rewrite setup
This code is much easier to read if one does not have to keep track of mutable variables. This also fixes the alignment code on the TSEG smihandler setup code. It was aligning the code upwards instead of downwards which would cause it to encroach a part of the save state. Change-Id: I310a232ced2ab15064bff99a39a26f745239f6b9 Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/c/coreboot/+/63475 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-by: Martin L Roth <gaumless@tutanota.com>
This commit is contained in:
Arthur Heymans
Martin L Roth
parent
1b970bd225
commit
5747f6cdd1
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@ -414,8 +414,30 @@ int smm_setup_relocation_handler(struct smm_loader_params *params)
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params, fxsave_area_relocation);
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params, fxsave_area_relocation);
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}
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}
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static int smm_load_module_aseg(const uintptr_t smram_base, const size_t smram_size,
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static void setup_smihandler_params(struct smm_runtime *mod_params,
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struct smm_loader_params *params);
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uintptr_t smram_base,
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uintptr_t smram_size,
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struct smm_loader_params *loader_params)
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{
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mod_params->smbase = smram_base;
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mod_params->smm_size = smram_size;
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mod_params->save_state_size = loader_params->real_cpu_save_state_size;
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mod_params->num_cpus = loader_params->num_cpus;
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mod_params->gnvs_ptr = (uint32_t)(uintptr_t)acpi_get_gnvs();
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const struct cbmem_entry *cbmemc;
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if (CONFIG(CONSOLE_CBMEM) && (cbmemc = cbmem_entry_find(CBMEM_ID_CONSOLE))) {
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mod_params->cbmemc = cbmem_entry_start(cbmemc);
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mod_params->cbmemc_size = cbmem_entry_size(cbmemc);
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} else {
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mod_params->cbmemc = 0;
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mod_params->cbmemc_size = 0;
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}
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for (int i = 0; i < loader_params->num_cpus; i++) {
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mod_params->save_state_top[i] = cpus[i].ss_start
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+ loader_params->per_cpu_save_state_size;
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}
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}
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/*
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/*
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*The SMM module is placed within the provided region in the following
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*The SMM module is placed within the provided region in the following
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@ -443,159 +465,83 @@ static int smm_load_module_aseg(const uintptr_t smram_base, const size_t smram_s
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* expects a region large enough to encompass the handler and stacks
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* expects a region large enough to encompass the handler and stacks
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* as well as the SMM_DEFAULT_SIZE.
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* as well as the SMM_DEFAULT_SIZE.
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*/
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*/
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int smm_load_module(const uintptr_t smram_base, const size_t smram_size,
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static int smm_load_module_tseg(const uintptr_t smram_base, const size_t smram_size,
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struct smm_loader_params *params)
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struct smm_loader_params *params)
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{
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{
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struct rmodule smm_mod;
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struct smm_runtime *handler_mod_params;
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size_t total_stack_size;
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size_t handler_size;
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size_t module_alignment;
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size_t alignment_size;
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size_t fxsave_size;
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void *fxsave_area;
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size_t total_size = 0;
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uintptr_t base; /* The base for the permanent handler */
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const struct cbmem_entry *cbmemc;
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if (CONFIG(SMM_ASEG))
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return smm_load_module_aseg(smram_base, smram_size, params);
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if (smram_size <= SMM_DEFAULT_SIZE)
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if (smram_size <= SMM_DEFAULT_SIZE)
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return -1;
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return -1;
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/* Load main SMI handler at the top of SMRAM
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struct rmodule smi_handler;
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* everything else will go below
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if (rmodule_parse(&_binary_smm_start, &smi_handler))
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*/
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base = smram_base;
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base += smram_size;
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/* Fail if can't parse the smm rmodule. */
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if (rmodule_parse(&_binary_smm_start, &smm_mod))
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return -1;
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return -1;
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/* Clear SMM region */
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const uintptr_t smram_top = smram_base + smram_size;
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if (CONFIG(DEBUG_SMI))
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memset((void *)smram_base, 0xcd, smram_size);
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total_stack_size = stack_top - smram_base;
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const size_t stm_size =
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total_size += total_stack_size;
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CONFIG(STM) ? CONFIG_MSEG_SIZE - CONFIG_BIOS_RESOURCE_LIST_SIZE : 0;
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/* Stacks are the base of SMRAM */
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const uintptr_t stm_base = CONFIG(STM) ? smram_top - stm_size : 0;
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if (stm_size) {
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printk(BIOS_DEBUG, "STM [0x%lx-0x%lx[\n", stm_base,
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stm_base + stm_size);
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/* MSEG starts at the top of SMRAM and works down */
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printk(BIOS_DEBUG, "MSEG size 0x%x\n", CONFIG_MSEG_SIZE);
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if (CONFIG(STM)) {
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printk(BIOS_DEBUG, "BIOS res list 0x%x\n", CONFIG_BIOS_RESOURCE_LIST_SIZE);
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base -= CONFIG_MSEG_SIZE + CONFIG_BIOS_RESOURCE_LIST_SIZE;
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total_size += CONFIG_MSEG_SIZE + CONFIG_BIOS_RESOURCE_LIST_SIZE;
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}
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}
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const size_t fx_save_area_size = CONFIG(SSE) ? FXSAVE_SIZE * params->num_cpus : 0;
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const uintptr_t fx_save_area_base =
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CONFIG(SSE) ? smram_top - stm_size - fx_save_area_size : 0;
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if (fx_save_area_size)
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printk(BIOS_DEBUG, "fx_save [0x%lx-0x%lx[\n", fx_save_area_base,
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fx_save_area_base + fx_save_area_size);
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const size_t handler_size = rmodule_memory_size(&smi_handler);
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const size_t handler_alignment = rmodule_load_alignment(&smi_handler);
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const uintptr_t handler_base =
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ALIGN_DOWN(smram_top - stm_size - fx_save_area_size - handler_size,
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handler_alignment);
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printk(BIOS_DEBUG, "smihandler [0x%lx-0x%lx[\n", handler_base,
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handler_base + handler_size);
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/* FXSAVE goes below MSEG */
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if (handler_base <= smram_base) {
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if (CONFIG(SSE)) {
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printk(BIOS_ERR, "Permanent handler won't FIT smram\n");
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fxsave_size = FXSAVE_SIZE * params->num_cpus;
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fxsave_area = (char *)base - fxsave_size;
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base -= fxsave_size;
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total_size += fxsave_size;
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} else {
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fxsave_size = 0;
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fxsave_area = NULL;
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}
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handler_size = rmodule_memory_size(&smm_mod);
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base -= handler_size;
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total_size += handler_size;
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module_alignment = rmodule_load_alignment(&smm_mod);
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alignment_size = module_alignment - (base % module_alignment);
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if (alignment_size != module_alignment) {
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handler_size += alignment_size;
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base += alignment_size;
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}
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printk(BIOS_DEBUG,
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"%s: total_smm_space_needed %zx, available -> %zx\n",
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__func__, total_size, smram_size);
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/* Does the required amount of memory exceed the SMRAM region size? */
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if (total_size > smram_size) {
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printk(BIOS_ERR, "%s: need more SMRAM\n", __func__);
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return -1;
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}
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if (handler_size > SMM_CODE_SEGMENT_SIZE) {
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printk(BIOS_ERR, "%s: increase SMM_CODE_SEGMENT_SIZE: handler_size = %zx\n",
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__func__, handler_size);
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return -1;
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return -1;
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}
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}
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if (rmodule_load((void *)base, &smm_mod))
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const uintptr_t stub_segment_base = handler_base - SMM_CODE_SEGMENT_SIZE;
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return -1;
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if (!smm_create_map(stub_segment_base, params->num_concurrent_save_states, params)) {
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params->handler = rmodule_entry(&smm_mod);
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handler_mod_params = rmodule_parameters(&smm_mod);
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handler_mod_params->smbase = smram_base;
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handler_mod_params->smm_size = smram_size;
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handler_mod_params->save_state_size = params->real_cpu_save_state_size;
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handler_mod_params->num_cpus = params->num_cpus;
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handler_mod_params->gnvs_ptr = (uintptr_t)acpi_get_gnvs();
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if (CONFIG(CONSOLE_CBMEM) && (cbmemc = cbmem_entry_find(CBMEM_ID_CONSOLE))) {
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handler_mod_params->cbmemc = cbmem_entry_start(cbmemc);
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handler_mod_params->cbmemc_size = cbmem_entry_size(cbmemc);
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} else {
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handler_mod_params->cbmemc = 0;
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handler_mod_params->cbmemc_size = 0;
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}
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printk(BIOS_DEBUG, "%s: smram_start: 0x%lx\n", __func__, smram_base);
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printk(BIOS_DEBUG, "%s: smram_end: %lx\n", __func__, smram_base + smram_size);
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printk(BIOS_DEBUG, "%s: handler start %p\n",
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__func__, params->handler);
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printk(BIOS_DEBUG, "%s: handler_size %zx\n",
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__func__, handler_size);
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printk(BIOS_DEBUG, "%s: fxsave_area %p\n",
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__func__, fxsave_area);
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printk(BIOS_DEBUG, "%s: fxsave_size %zx\n",
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__func__, fxsave_size);
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printk(BIOS_DEBUG, "%s: CONFIG_MSEG_SIZE 0x%x\n",
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__func__, CONFIG_MSEG_SIZE);
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printk(BIOS_DEBUG, "%s: CONFIG_BIOS_RESOURCE_LIST_SIZE 0x%x\n",
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__func__, CONFIG_BIOS_RESOURCE_LIST_SIZE);
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printk(BIOS_DEBUG, "%s: handler_mod_params.smbase = 0x%x\n", __func__,
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handler_mod_params->smbase);
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printk(BIOS_DEBUG, "%s: per_cpu_save_state_size = 0x%x\n", __func__,
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handler_mod_params->save_state_size);
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printk(BIOS_DEBUG, "%s: num_cpus = 0x%x\n", __func__, handler_mod_params->num_cpus);
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printk(BIOS_DEBUG, "%s: cbmemc = %p, cbmemc_size = %#x\n", __func__,
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handler_mod_params->cbmemc, handler_mod_params->cbmemc_size);
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printk(BIOS_DEBUG, "%s: total_save_state_size = 0x%x\n", __func__,
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(handler_mod_params->save_state_size * handler_mod_params->num_cpus));
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/* CPU 0 smbase goes first, all other CPUs
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* will be staggered below
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*/
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base -= SMM_CODE_SEGMENT_SIZE;
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printk(BIOS_DEBUG, "%s: cpu0 entry: %lx\n", __func__, base);
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if (!smm_create_map(base, params->num_concurrent_save_states, params)) {
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printk(BIOS_ERR, "%s: Error creating CPU map\n", __func__);
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printk(BIOS_ERR, "%s: Error creating CPU map\n", __func__);
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return -1;
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return -1;
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}
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}
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for (int i = 0; i < params->num_cpus; i++) {
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const uintptr_t lowest_stub = cpus[params->num_concurrent_save_states - 1].code_start;
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handler_mod_params->save_state_top[i] =
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const uintptr_t smm_stack_top =
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cpus[i].ss_start + params->per_cpu_save_state_size;
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smram_base + params->num_concurrent_save_states * CONFIG_SMM_MODULE_STACK_SIZE;
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printk(BIOS_DEBUG, "cpu stacks [0x%lx-0x%lx[\n", smram_base, smm_stack_top);
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if (lowest_stub < smm_stack_top) {
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printk(BIOS_ERR, "SMM stubs won't fit in SMRAM 0x%lx\n",
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cpus[params->num_concurrent_save_states - 1].code_start);
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return -1;
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}
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}
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return smm_module_setup_stub(base, smram_size, params, fxsave_area);
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if (rmodule_load((void *)handler_base, &smi_handler))
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return -1;
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struct smm_runtime *smihandler_params = rmodule_parameters(&smi_handler);
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params->handler = rmodule_entry(&smi_handler);
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setup_smihandler_params(smihandler_params, smram_base, smram_size, params);
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return smm_module_setup_stub(stub_segment_base, smram_size, params,
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(void *)fx_save_area_base);
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}
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}
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/*
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/*
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*The SMM module is placed within the provided region in the following
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*The SMM module is placed within the provided region in the following
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* manner:
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* manner:
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* +-----------------+ <- smram + size == 0x10000
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* +-----------------+ <- smram + size == 0xB0000
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* | save states |
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* | save states |
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* +-----------------+
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* +-----------------+
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* | fxsave area |
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* | fxsave area |
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* +-----------------+
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* +-----------------+
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* | smi handler |
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* | smi handler | (or below the stubs if there is more space there)
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* | ... |
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* | ... |
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* +-----------------+ <- cpu0
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* +-----------------+ <- cpu0
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* | stub code | <- cpu1
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* | stub code | <- cpu1
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@ -610,17 +556,11 @@ int smm_load_module(const uintptr_t smram_base, const size_t smram_size,
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static int smm_load_module_aseg(const uintptr_t smram_base, const size_t smram_size,
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static int smm_load_module_aseg(const uintptr_t smram_base, const size_t smram_size,
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struct smm_loader_params *params)
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struct smm_loader_params *params)
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{
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{
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struct rmodule smm_mod;
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struct smm_runtime *handler_mod_params;
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if (smram_size != SMM_DEFAULT_SIZE)
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if (smram_size != SMM_DEFAULT_SIZE)
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return -1;
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return -1;
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if (smram_base != SMM_BASE)
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struct rmodule smi_handler;
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return -1;
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if (rmodule_parse(&_binary_smm_start, &smi_handler))
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/* Fail if can't parse the smm rmodule. */
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if (rmodule_parse(&_binary_smm_start, &smm_mod))
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return -1;
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return -1;
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if (!smm_create_map(smram_base, params->num_concurrent_save_states, params)) {
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if (!smm_create_map(smram_base, params->num_concurrent_save_states, params)) {
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@ -628,55 +568,74 @@ static int smm_load_module_aseg(const uintptr_t smram_base, const size_t smram_s
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return -1;
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return -1;
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}
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}
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const uintptr_t entry0_end = cpus[0].code_end;
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const uintptr_t smm_stack_top =
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const uintptr_t save_state_base = cpus[params->num_cpus - 1].ss_start;
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smram_base + params->num_concurrent_save_states * CONFIG_SMM_MODULE_STACK_SIZE;
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const size_t fxsave_size = FXSAVE_SIZE * params->num_cpus;
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printk(BIOS_DEBUG, "cpu stacks [0x%lx-0x%lx[\n", smram_base, smm_stack_top);
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const uintptr_t fxsave_base = ALIGN_DOWN(save_state_base - fxsave_size, 16);
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if (smm_stack_top > cpus[params->num_concurrent_save_states - 1].code_start) {
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printk(BIOS_ERR, "stack won't fit in smram\n");
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if (fxsave_base <= entry0_end) {
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printk(BIOS_ERR, "%s, fxsave %lx won't fit smram\n", __func__, fxsave_base);
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return -1;
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return -1;
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}
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}
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const size_t handler_size = rmodule_memory_size(&smm_mod);
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const uintptr_t save_state_bottom =
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const size_t module_alignment = rmodule_load_alignment(&smm_mod);
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cpus[params->num_concurrent_save_states - 1].ss_start;
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const uintptr_t module_base = ALIGN_DOWN(fxsave_base - handler_size, module_alignment);
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const size_t fx_save_area_size = CONFIG(SSE) ? FXSAVE_SIZE * params->num_cpus : 0;
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const uintptr_t fx_save_area_base =
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CONFIG(SSE) ? save_state_bottom - fx_save_area_size : 0;
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if (fx_save_area_size) {
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printk(BIOS_DEBUG, "fx_save [0x%lx-0x%lx[\n", fx_save_area_base,
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fx_save_area_base + fx_save_area_size);
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if (module_base <= entry0_end) {
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if (fx_save_area_base < cpus[0].code_end) {
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printk(BIOS_ERR, "%s, module won't fit smram\n", __func__);
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printk(BIOS_ERR, "fxsave won't fit in smram\n");
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return -1;
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return -1;
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}
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}
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}
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if (rmodule_load((void *)module_base, &smm_mod))
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const size_t top_space = save_state_bottom - fx_save_area_size - cpus[0].code_end;
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const size_t bottom_space =
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|
cpus[params->num_concurrent_save_states - 1].code_start - smm_stack_top;
|
||||||
|
const bool use_top = top_space >= bottom_space;
|
||||||
|
|
||||||
|
const size_t handler_size = rmodule_memory_size(&smi_handler);
|
||||||
|
const size_t handler_alignment = rmodule_load_alignment(&smi_handler);
|
||||||
|
uintptr_t handler_base;
|
||||||
|
if (use_top) {
|
||||||
|
handler_base = ALIGN_DOWN(save_state_bottom - fx_save_area_size - handler_size,
|
||||||
|
handler_alignment);
|
||||||
|
if (handler_base < cpus[0].code_end) {
|
||||||
|
printk(BIOS_ERR, "handler won't fit in top of smram\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
handler_base = ALIGN_UP(stack_top, handler_alignment);
|
||||||
|
const uintptr_t handler_top = handler_base + handler_size;
|
||||||
|
if (handler_top > cpus[params->num_concurrent_save_states - 1].code_start) {
|
||||||
|
printk(BIOS_ERR, "handler won't fit in bottom of smram\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
printk(BIOS_DEBUG, "handler [0x%lx-0x%lx[\n", handler_base,
|
||||||
|
handler_base + handler_size);
|
||||||
|
|
||||||
|
if (rmodule_load((void *)handler_base, &smi_handler))
|
||||||
return -1;
|
return -1;
|
||||||
|
|
||||||
params->handler = rmodule_entry(&smm_mod);
|
struct smm_runtime *smihandler_params = rmodule_parameters(&smi_handler);
|
||||||
handler_mod_params = rmodule_parameters(&smm_mod);
|
params->handler = rmodule_entry(&smi_handler);
|
||||||
handler_mod_params->smbase = smram_base;
|
setup_smihandler_params(smihandler_params, smram_base, smram_size, params);
|
||||||
handler_mod_params->smm_size = smram_size;
|
|
||||||
handler_mod_params->save_state_size = params->real_cpu_save_state_size;
|
|
||||||
handler_mod_params->num_cpus = params->num_cpus;
|
|
||||||
handler_mod_params->gnvs_ptr = (uintptr_t)acpi_get_gnvs();
|
|
||||||
|
|
||||||
for (int i = 0; i < params->num_cpus; i++) {
|
return smm_module_setup_stub(smram_base, smram_size, params,
|
||||||
handler_mod_params->save_state_top[i] =
|
(void *)fx_save_area_base);
|
||||||
cpus[i].ss_start + params->per_cpu_save_state_size;
|
|
||||||
}
|
}
|
||||||
|
|
||||||
printk(BIOS_DEBUG, "%s: smram_start: 0x%lx\n", __func__, smram_base);
|
|
||||||
printk(BIOS_DEBUG, "%s: smram_end: %lx\n", __func__, smram_base + smram_size);
|
|
||||||
printk(BIOS_DEBUG, "%s: handler start %p\n", __func__, params->handler);
|
|
||||||
printk(BIOS_DEBUG, "%s: handler_size %zx\n", __func__, handler_size);
|
|
||||||
printk(BIOS_DEBUG, "%s: fxsave_area %lx\n", __func__, fxsave_base);
|
|
||||||
printk(BIOS_DEBUG, "%s: fxsave_size %zx\n", __func__, fxsave_size);
|
|
||||||
|
|
||||||
printk(BIOS_DEBUG, "%s: handler_mod_params.smbase = 0x%x\n", __func__,
|
int smm_load_module(const uintptr_t smram_base, const size_t smram_size,
|
||||||
handler_mod_params->smbase);
|
struct smm_loader_params *params)
|
||||||
printk(BIOS_DEBUG, "%s: per_cpu_save_state_size = 0x%x\n", __func__,
|
{
|
||||||
handler_mod_params->save_state_size);
|
if (CONFIG(SMM_ASEG))
|
||||||
printk(BIOS_DEBUG, "%s: num_cpus = 0x%x\n", __func__, handler_mod_params->num_cpus);
|
return smm_load_module_aseg(smram_base, smram_size, params);
|
||||||
printk(BIOS_DEBUG, "%s: total_save_state_size = 0x%x\n", __func__,
|
else if (CONFIG(SMM_TSEG))
|
||||||
(handler_mod_params->save_state_size * handler_mod_params->num_cpus));
|
return smm_load_module_tseg(smram_base, smram_size, params);
|
||||||
|
|
||||||
return smm_module_setup_stub(smram_base, smram_size, params, (void *)fxsave_base);
|
return -1;
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue