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-rw-r--r--src/cpu/x86/Kconfig8
-rw-r--r--src/cpu/x86/mp_init.c39
-rw-r--r--src/cpu/x86/smm/Makefile.inc4
-rw-r--r--src/cpu/x86/smm/smm_module_loaderv2.c655
-rw-r--r--src/include/cpu/x86/smm.h18
5 files changed, 716 insertions, 8 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 5394cd023d..b3a16bcf63 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -121,6 +121,14 @@ config SMM_STUB_STACK_SIZE
endif
+config X86_SMM_LOADER_VERSION2
+ bool
+ default n
+ depends on HAVE_SMI_HANDLER
+ help
+ This option enables SMM module loader that works with server
+ platforms which may contain more than 32 CPU threads.
+
config SMM_LAPIC_REMAP_MITIGATION
bool
default y if NORTHBRIDGE_INTEL_I945
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index caed8f4005..5807831c98 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -726,12 +726,21 @@ static void asmlinkage smm_do_relocation(void *arg)
* the location of the new SMBASE. If using SMM modules then this
* calculation needs to match that of the module loader.
*/
+#if CONFIG(X86_SMM_LOADER_VERSION2)
+ perm_smbase = smm_get_cpu_smbase(cpu);
+ mp_state.perm_smbase = perm_smbase;
+ if (!perm_smbase) {
+ printk(BIOS_ERR, "%s: bad SMBASE for CPU %d\n", __func__, cpu);
+ return;
+ }
+#else
perm_smbase = mp_state.perm_smbase;
perm_smbase -= cpu * runtime->save_state_size;
-
- printk(BIOS_DEBUG, "New SMBASE 0x%08lx\n", perm_smbase);
+#endif
/* Setup code checks this callback for validity. */
+ printk(BIOS_INFO, "%s : curr_smbase 0x%x perm_smbase 0x%x, cpu = %d\n",
+ __func__, (int)curr_smbase, (int)perm_smbase, cpu);
mp_state.ops.relocation_handler(cpu, curr_smbase, perm_smbase);
if (CONFIG(STM)) {
@@ -758,9 +767,17 @@ static void adjust_smm_apic_id_map(struct smm_loader_params *smm_params)
static int install_relocation_handler(int num_cpus, size_t save_state_size)
{
+ int cpus = num_cpus;
+#if CONFIG(X86_SMM_LOADER_VERSION2)
+ /* Default SMRAM size is not big enough to concurrently
+ * handle relocation for more than ~32 CPU threads
+ * therefore, relocate 1 by 1. */
+ cpus = 1;
+#endif
+
struct smm_loader_params smm_params = {
.per_cpu_stack_size = CONFIG_SMM_STUB_STACK_SIZE,
- .num_concurrent_stacks = num_cpus,
+ .num_concurrent_stacks = cpus,
.per_cpu_save_state_size = save_state_size,
.num_concurrent_save_states = 1,
.handler = smm_do_relocation,
@@ -770,9 +787,10 @@ static int install_relocation_handler(int num_cpus, size_t save_state_size)
if (mp_state.ops.adjust_smm_params != NULL)
mp_state.ops.adjust_smm_params(&smm_params, 0);
- if (smm_setup_relocation_handler(&smm_params))
+ if (smm_setup_relocation_handler(&smm_params)) {
+ printk(BIOS_ERR, "%s: smm setup failed\n", __func__);
return -1;
-
+ }
adjust_smm_apic_id_map(&smm_params);
return 0;
@@ -781,8 +799,13 @@ static int install_relocation_handler(int num_cpus, size_t save_state_size)
static int install_permanent_handler(int num_cpus, uintptr_t smbase,
size_t smsize, size_t save_state_size)
{
- /* There are num_cpus concurrent stacks and num_cpus concurrent save
- * state areas. Lastly, set the stack size to 1KiB. */
+ /*
+ * All the CPUs will relocate to permanaent handler now. Set parameters
+ * needed for all CPUs. The placement of each CPUs entry point is
+ * determined by the loader. This code simply provides the beginning of
+ * SMRAM region, the number of CPUs who will use the handler, the stack
+ * size and save state size for each CPU.
+ */
struct smm_loader_params smm_params = {
.per_cpu_stack_size = CONFIG_SMM_MODULE_STACK_SIZE,
.num_concurrent_stacks = num_cpus,
@@ -794,7 +817,7 @@ static int install_permanent_handler(int num_cpus, uintptr_t smbase,
if (mp_state.ops.adjust_smm_params != NULL)
mp_state.ops.adjust_smm_params(&smm_params, 1);
- printk(BIOS_DEBUG, "Installing SMM handler to 0x%08lx\n", smbase);
+ printk(BIOS_DEBUG, "Installing permanent SMM handler to 0x%08lx\n", smbase);
if (smm_load_module((void *)smbase, smsize, &smm_params))
return -1;
diff --git a/src/cpu/x86/smm/Makefile.inc b/src/cpu/x86/smm/Makefile.inc
index dbe567a8a2..1273a6cf27 100644
--- a/src/cpu/x86/smm/Makefile.inc
+++ b/src/cpu/x86/smm/Makefile.inc
@@ -1,6 +1,10 @@
## SPDX-License-Identifier: GPL-2.0-only
+ifeq ($(CONFIG_X86_SMM_LOADER_VERSION2),y)
+ramstage-y += smm_module_loaderv2.c
+else
ramstage-y += smm_module_loader.c
+endif
ramstage-y += smi_trigger.c
ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_32),y)
diff --git a/src/cpu/x86/smm/smm_module_loaderv2.c b/src/cpu/x86/smm/smm_module_loaderv2.c
new file mode 100644
index 0000000000..10cc6281f7
--- /dev/null
+++ b/src/cpu/x86/smm/smm_module_loaderv2.c
@@ -0,0 +1,655 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdint.h>
+#include <string.h>
+#include <rmodule.h>
+#include <cpu/x86/smm.h>
+#include <commonlib/helpers.h>
+#include <console/console.h>
+#include <security/intel/stm/SmmStm.h>
+
+#define FXSAVE_SIZE 512
+#define SMM_CODE_SEGMENT_SIZE 0x10000
+/* FXSAVE area during relocation. While it may not be strictly needed the
+ SMM stub code relies on the FXSAVE area being non-zero to enable SSE
+ instructions within SMM mode. */
+static uint8_t fxsave_area_relocation[CONFIG_MAX_CPUS][FXSAVE_SIZE]
+__attribute__((aligned(16)));
+
+/*
+ * Components that make up the SMRAM:
+ * 1. Save state - the total save state memory used
+ * 2. Stack - stacks for the CPUs in the SMM handler
+ * 3. Stub - SMM stub code for calling into handler
+ * 4. Handler - C-based SMM handler.
+ *
+ * The components are assumed to consist of one consecutive region.
+ */
+
+/* These parameters are used by the SMM stub code. A pointer to the params
+ * is also passed to the C-base handler. */
+struct smm_stub_params {
+ u32 stack_size;
+ u32 stack_top;
+ u32 c_handler;
+ u32 c_handler_arg;
+ u32 fxsave_area;
+ u32 fxsave_area_size;
+ struct smm_runtime runtime;
+} __packed;
+
+/*
+ * The stub is the entry point that sets up protected mode and stacks for each
+ * CPU. It then calls into the SMM handler module. It is encoded as an rmodule.
+ */
+extern unsigned char _binary_smmstub_start[];
+
+/* Per CPU minimum stack size. */
+#define SMM_MINIMUM_STACK_SIZE 32
+
+struct cpu_smm_info {
+ uint8_t active;
+ uintptr_t smbase;
+ uintptr_t entry;
+ uintptr_t ss_start;
+ uintptr_t code_start;
+ uintptr_t code_end;
+};
+struct cpu_smm_info cpus[CONFIG_MAX_CPUS] = { 0 };
+
+/*
+ * This method creates a map of all the CPU entry points, save state locations
+ * and the beginning and end of code segments for each CPU. This map is used
+ * during relocation to properly align as many CPUs that can fit into the SMRAM
+ * region. For more information on how SMRAM works, refer to the latest Intel
+ * developer's manuals (volume 3, chapter 34). SMRAM is divided up into the
+ * following regions:
+ * +-----------------+ Top of SMRAM
+ * | | <- MSEG, FXSAVE
+ * +-----------------+
+ * | common |
+ * | smi handler | 64K
+ * | |
+ * +-----------------+
+ * | CPU 0 code seg |
+ * +-----------------+
+ * | CPU 1 code seg |
+ * +-----------------+
+ * | CPU x code seg |
+ * +-----------------+
+ * | |
+ * | |
+ * +-----------------+
+ * | stacks |
+ * +-----------------+ <- START of SMRAM
+ *
+ * The code below checks when a code segment is full and begins placing the remainder
+ * CPUs in the lower segments. The entry point for each CPU is smbase + 0x8000
+ * and save state is smbase + 0x8000 + (0x8000 - state save size). Save state
+ * area grows downward into the CPUs entry point. Therefore staggering too many
+ * CPUs in one 32K block will corrupt CPU0's entry code as the save states move
+ * downward.
+ * input : smbase of first CPU (all other CPUs
+ * will go below this address)
+ * input : num_cpus in the system. The map will
+ * be created from 0 to num_cpus.
+ */
+static int smm_create_map(uintptr_t smbase, unsigned int num_cpus,
+ const struct smm_loader_params *params)
+{
+ unsigned int i;
+ struct rmodule smm_stub;
+ unsigned int ss_size = params->per_cpu_save_state_size, stub_size;
+ unsigned int smm_entry_offset = params->smm_main_entry_offset;
+ unsigned int seg_count = 0, segments = 0, available;
+ unsigned int cpus_in_segment = 0;
+ unsigned int base = smbase;
+
+ if (rmodule_parse(&_binary_smmstub_start, &smm_stub)) {
+ printk(BIOS_ERR, "%s: unable to get SMM module size\n", __func__);
+ return 0;
+ }
+
+ stub_size = rmodule_memory_size(&smm_stub);
+ /* How many CPUs can fit into one 64K segment? */
+ available = 0xFFFF - smm_entry_offset - ss_size - stub_size;
+ if (available > 0) {
+ cpus_in_segment = available / ss_size;
+ /* minimum segments needed will always be 1 */
+ segments = num_cpus / cpus_in_segment + 1;
+ printk(BIOS_DEBUG,
+ "%s: cpus allowed in one segment %d\n", __func__, cpus_in_segment);
+ printk(BIOS_DEBUG,
+ "%s: min # of segments needed %d\n", __func__, segments);
+ } else {
+ printk(BIOS_ERR, "%s: not enough space in SMM to setup all CPUs\n", __func__);
+ printk(BIOS_ERR, " save state & stub size need to be reduced\n");
+ printk(BIOS_ERR, " or increase SMRAM size\n");
+ return 0;
+ }
+
+ if (sizeof(cpus) / sizeof(struct cpu_smm_info) < num_cpus) {
+ printk(BIOS_ERR,
+ "%s: increase MAX_CPUS in Kconfig\n", __func__);
+ return 0;
+ }
+
+ for (i = 0; i < num_cpus; i++) {
+ cpus[i].smbase = base;
+ cpus[i].entry = base + smm_entry_offset;
+ cpus[i].ss_start = cpus[i].entry + (smm_entry_offset - ss_size);
+ cpus[i].code_start = cpus[i].entry;
+ cpus[i].code_end = cpus[i].entry + stub_size;
+ cpus[i].active = 1;
+ base -= ss_size;
+ seg_count++;
+ if (seg_count >= cpus_in_segment) {
+ base -= smm_entry_offset;
+ seg_count = 0;
+ }
+ }
+
+ if (CONFIG_DEFAULT_CONSOLE_LOGLEVEL >= BIOS_DEBUG) {
+ seg_count = 0;
+ for (i = 0; i < num_cpus; i++) {
+ printk(BIOS_DEBUG, "CPU 0x%x\n", i);
+ printk(BIOS_DEBUG,
+ " smbase %zx entry %zx\n",
+ cpus[i].smbase, cpus[i].entry);
+ printk(BIOS_DEBUG,
+ " ss_start %zx code_end %zx\n",
+ cpus[i].ss_start, cpus[i].code_end);
+ seg_count++;
+ if (seg_count >= cpus_in_segment) {
+ printk(BIOS_DEBUG,
+ "-------------NEW CODE SEGMENT --------------\n");
+ seg_count = 0;
+ }
+ }
+ }
+ return 1;
+}
+
+/*
+ * This method expects the smm relocation map to be complete.
+ * This method does not read any HW registers, it simply uses a
+ * map that was created during SMM setup.
+ * input: cpu_num - cpu number which is used as an index into the
+ * map to return the smbase
+ */
+u32 smm_get_cpu_smbase(unsigned int cpu_num)
+{
+ if (cpu_num < CONFIG_MAX_CPUS) {
+ if (cpus[cpu_num].active)
+ return cpus[cpu_num].smbase;
+ }
+ return 0;
+}
+
+/*
+ * This method assumes that at least 1 CPU has been set up from
+ * which it will place other CPUs below its smbase ensuring that
+ * save state does not clobber the first CPUs init code segment. The init
+ * code which is the smm stub code is the same for all CPUs. They enter
+ * smm, setup stacks (based on their apic id), enter protected mode
+ * and then jump to the common smi handler. The stack is allocated
+ * at the beginning of smram (aka tseg base, not smbase). The stack
+ * pointer for each CPU is calculated by using its apic id
+ * (code is in smm_stub.s)
+ * Each entry point will now have the same stub code which, sets up the CPU
+ * stack, enters protected mode and then jumps to the smi handler. It is
+ * important to enter protected mode before the jump because the "jump to
+ * address" might be larger than the 20bit address supported by real mode.
+ * SMI entry right now is in real mode.
+ * input: smbase - this is the smbase of the first cpu not the smbase
+ * where tseg starts (aka smram_start). All CPUs code segment
+ * and stack will be below this point except for the common
+ * SMI handler which is one segment above
+ * input: num_cpus - number of cpus that need relocation including
+ * the first CPU (though its code is already loaded)
+ * input: top of stack (stacks work downward by default in Intel HW)
+ * output: return -1, if runtime smi code could not be installed. In
+ * this case SMM will not work and any SMI's generated will
+ * cause a CPU shutdown or general protection fault because
+ * the appropriate smi handling code was not installed
+ */
+
+static int smm_place_entry_code(uintptr_t smbase, unsigned int num_cpus,
+ unsigned int stack_top, const struct smm_loader_params *params)
+{
+ unsigned int i;
+ unsigned int size;
+ if (smm_create_map(smbase, num_cpus, params)) {
+ /*
+ * Ensure there was enough space and the last CPUs smbase
+ * did not encroach upon the stack. Stack top is smram start
+ * + size of stack.
+ */
+ if (cpus[num_cpus].active) {
+ if (cpus[num_cpus - 1].smbase +
+ params->smm_main_entry_offset < stack_top) {
+ printk(BIOS_ERR, "%s: stack encroachment\n", __func__);
+ printk(BIOS_ERR, "%s: smbase %zx, stack_top %x\n",
+ __func__, cpus[num_cpus].smbase, stack_top);
+ return 0;
+ }
+ }
+ } else {
+ printk(BIOS_ERR, "%s: unable to place smm entry code\n", __func__);
+ return 0;
+ }
+
+ printk(BIOS_INFO, "%s: smbase %zx, stack_top %x\n",
+ __func__, cpus[num_cpus-1].smbase, stack_top);
+
+ /* start at 1, the first CPU stub code is already there */
+ size = cpus[0].code_end - cpus[0].code_start;
+ for (i = 1; i < num_cpus; i++) {
+ memcpy((int *)cpus[i].code_start, (int *)cpus[0].code_start, size);
+ printk(BIOS_DEBUG,
+ "SMM Module: placing smm entry code at %zx, cpu # 0x%x\n",
+ cpus[i].code_start, i);
+ printk(BIOS_DEBUG, "%s: copying from %zx to %zx 0x%x bytes\n",
+ __func__, cpus[0].code_start, cpus[i].code_start, size);
+ }
+ return 1;
+}
+
+/*
+ * Place stacks in base -> base + size region, but ensure the stacks don't
+ * overlap the staggered entry points.
+ */
+static void *smm_stub_place_stacks(char *base, size_t size,
+ struct smm_loader_params *params)
+{
+ size_t total_stack_size;
+ char *stacks_top;
+
+ /* If stack space is requested assume the space lives in the lower
+ * half of SMRAM. */
+ total_stack_size = params->per_cpu_stack_size *
+ params->num_concurrent_stacks;
+ printk(BIOS_DEBUG, "%s: cpus: %zx : stack space: needed -> %zx\n",
+ __func__, params->num_concurrent_stacks,
+ total_stack_size);
+ printk(BIOS_DEBUG, " available -> %zx : per_cpu_stack_size : %zx\n",
+ size, params->per_cpu_stack_size);
+
+ /* There has to be at least one stack user. */
+ if (params->num_concurrent_stacks < 1)
+ return NULL;
+
+ /* Total stack size cannot fit. */
+ if (total_stack_size > size)
+ return NULL;
+
+ /* Stacks extend down to SMBASE */
+ stacks_top = &base[total_stack_size];
+ printk(BIOS_DEBUG, "%s: exit, stack_top %p\n", __func__, stacks_top);
+
+ return stacks_top;
+}
+
+/*
+ * Place the staggered entry points for each CPU. The entry points are
+ * staggered by the per CPU SMM save state size extending down from
+ * SMM_ENTRY_OFFSET.
+ */
+static int smm_stub_place_staggered_entry_points(char *base,
+ const struct smm_loader_params *params, const struct rmodule *smm_stub)
+{
+ size_t stub_entry_offset;
+ int rc = 1;
+ stub_entry_offset = rmodule_entry_offset(smm_stub);
+ /* Each CPU now has its own stub code, which enters protected mode,
+ * sets up the stack, and then jumps to common SMI handler
+ */
+ if (params->num_concurrent_save_states > 1 || stub_entry_offset != 0) {
+ rc = smm_place_entry_code((unsigned int)base,
+ params->num_concurrent_save_states,
+ (unsigned int)params->stack_top, params);
+ }
+ return rc;
+}
+
+/*
+ * The stub setup code assumes it is completely contained within the
+ * default SMRAM size (0x10000) for the default SMI handler (entry at
+ * 0x30000), but no assumption should be made for the permanent SMI handler.
+ * The placement of CPU entry points for permanent handler are determined
+ * by the number of CPUs in the system and the amount of SMRAM.
+ * There are potentially 3 regions to place
+ * within the default SMRAM size:
+ * 1. Save state areas
+ * 2. Stub code
+ * 3. Stack areas
+ *
+ * The save state and smm stack are treated as contiguous for the number of
+ * concurrent areas requested. The save state always lives at the top of the
+ * the CPUS smbase (and the entry point is at offset 0x8000). This allows only a certain
+ * number of CPUs with staggered entry points until the save state area comes
+ * down far enough to overwrite/corrupt the entry code (stub code). Therefore,
+ * an SMM map is created to avoid this corruption, see smm_create_map() above.
+ * This module setup code works for the default (0x30000) SMM handler setup and the
+ * permanent SMM handler.
+ */
+static int smm_module_setup_stub(void *smbase, size_t smm_size,
+ struct smm_loader_params *params,
+ void *fxsave_area)
+{
+ size_t total_save_state_size;
+ size_t smm_stub_size;
+ size_t stub_entry_offset;
+ char *smm_stub_loc;
+ void *stacks_top;
+ size_t size;
+ char *base;
+ size_t i;
+ struct smm_stub_params *stub_params;
+ struct rmodule smm_stub;
+ unsigned int total_size_all;
+ base = smbase;
+ size = smm_size;
+
+ /* The number of concurrent stacks cannot exceed CONFIG_MAX_CPUS. */
+ if (params->num_concurrent_stacks > CONFIG_MAX_CPUS) {
+ printk(BIOS_ERR, "%s: not enough stacks\n", __func__);
+ return -1;
+ }
+
+ /* Fail if can't parse the smm stub rmodule. */
+ if (rmodule_parse(&_binary_smmstub_start, &smm_stub)) {
+ printk(BIOS_ERR, "%s: unable to parse smm stub\n", __func__);
+ return -1;
+ }
+
+ /* Adjust remaining size to account for save state. */
+ total_save_state_size = params->per_cpu_save_state_size *
+ params->num_concurrent_save_states;
+ if (total_save_state_size > size) {
+ printk(BIOS_ERR,
+ "%s: more state save space needed:need -> %zx:available->%zx\n",
+ __func__, total_save_state_size, size);
+ return -1;
+ }
+
+ size -= total_save_state_size;
+
+ /* The save state size encroached over the first SMM entry point. */
+ if (size <= params->smm_main_entry_offset) {
+ printk(BIOS_ERR, "%s: encroachment over SMM entry point\n", __func__);
+ printk(BIOS_ERR, "%s: state save size: %zx : smm_entry_offset -> %x\n",
+ __func__, size, params->smm_main_entry_offset);
+ return -1;
+ }
+
+ /* Need a minimum stack size and alignment. */
+ if (params->per_cpu_stack_size <= SMM_MINIMUM_STACK_SIZE ||
+ (params->per_cpu_stack_size & 3) != 0) {
+ printk(BIOS_ERR, "%s: need minimum stack size\n", __func__);
+ return -1;
+ }
+
+ smm_stub_loc = NULL;
+ smm_stub_size = rmodule_memory_size(&smm_stub);
+ stub_entry_offset = rmodule_entry_offset(&smm_stub);
+
+ /* Put the stub at the main entry point */
+ smm_stub_loc = &base[params->smm_main_entry_offset];
+
+ /* Stub is too big to fit. */
+ if (smm_stub_size > (size - params->smm_main_entry_offset)) {
+ printk(BIOS_ERR, "%s: stub is too big to fit\n", __func__);
+ return -1;
+ }
+
+ /* The stacks, if requested, live in the lower half of SMRAM space
+ * for default handler, but for relocated handler it lives at the beginning
+ * of SMRAM which is TSEG base
+ */
+ size = params->num_concurrent_stacks * params->per_cpu_stack_size;
+ stacks_top = smm_stub_place_stacks((char *)params->smram_start, size, params);
+ if (stacks_top == NULL) {
+ printk(BIOS_ERR, "%s: not enough space for stacks\n", __func__);
+ printk(BIOS_ERR, "%s: ....need -> %p : available -> %zx\n", __func__,
+ base, size);
+ return -1;
+ }
+ params->stack_top = stacks_top;
+ /* Load the stub. */
+ if (rmodule_load(smm_stub_loc, &smm_stub)) {
+ printk(BIOS_ERR, "%s: load module failed\n", __func__);
+ return -1;
+ }
+
+ if (!smm_stub_place_staggered_entry_points(base, params, &smm_stub)) {
+ printk(BIOS_ERR, "%s: staggered entry points failed\n", __func__);
+ return -1;
+ }
+
+ /* Setup the parameters for the stub code. */
+ stub_params = rmodule_parameters(&smm_stub);
+ stub_params->stack_top = (uintptr_t)stacks_top;
+ stub_params->stack_size = params->per_cpu_stack_size;
+ stub_params->c_handler = (uintptr_t)params->handler;
+ stub_params->c_handler_arg = (uintptr_t)params->handler_arg;
+ stub_params->fxsave_area = (uintptr_t)fxsave_area;
+ stub_params->fxsave_area_size = FXSAVE_SIZE;
+ stub_params->runtime.smbase = (uintptr_t)smbase;
+ stub_params->runtime.smm_size = smm_size;
+ stub_params->runtime.save_state_size = params->per_cpu_save_state_size;
+ stub_params->runtime.num_cpus = params->num_concurrent_stacks;
+
+ printk(BIOS_DEBUG, "%s: stack_end = 0x%x\n",
+ __func__, stub_params->runtime.smbase);
+ printk(BIOS_DEBUG,
+ "%s: stack_top = 0x%x\n", __func__, stub_params->stack_top);
+ printk(BIOS_DEBUG, "%s: stack_size = 0x%x\n",
+ __func__, stub_params->stack_size);
+ printk(BIOS_DEBUG, "%s: runtime.smbase = 0x%x\n",
+ __func__, stub_params->runtime.smbase);
+ printk(BIOS_DEBUG, "%s: runtime.start32_offset = 0x%x\n", __func__,
+ stub_params->runtime.start32_offset);
+ printk(BIOS_DEBUG, "%s: runtime.smm_size = 0x%zx\n",
+ __func__, smm_size);
+ printk(BIOS_DEBUG, "%s: per_cpu_save_state_size = 0x%x\n",
+ __func__, stub_params->runtime.save_state_size);
+ printk(BIOS_DEBUG, "%s: num_cpus = 0x%x\n", __func__,
+ stub_params->runtime.num_cpus);
+ printk(BIOS_DEBUG, "%s: total_save_state_size = 0x%x\n",
+ __func__, (stub_params->runtime.save_state_size *
+ stub_params->runtime.num_cpus));
+ total_size_all = stub_params->stack_size +
+ (stub_params->runtime.save_state_size *
+ stub_params->runtime.num_cpus);
+ printk(BIOS_DEBUG, "%s: total_size_all = 0x%x\n", __func__,
+ total_size_all);
+
+ /* Initialize the APIC id to CPU number table to be 1:1 */
+ for (i = 0; i < params->num_concurrent_stacks; i++)
+ stub_params->runtime.apic_id_to_cpu[i] = i;
+
+ /* Allow the initiator to manipulate SMM stub parameters. */
+ params->runtime = &stub_params->runtime;
+
+ printk(BIOS_DEBUG, "SMM Module: stub loaded at %p. Will call %p(%p)\n",
+ smm_stub_loc, params->handler, params->handler_arg);
+ return 0;
+}
+
+/*
+ * smm_setup_relocation_handler assumes the callback is already loaded in
+ * memory. i.e. Another SMM module isn't chained to the stub. The other
+ * assumption is that the stub will be entered from the default SMRAM
+ * location: 0x30000 -> 0x40000.
+ */
+int smm_setup_relocation_handler(struct smm_loader_params *params)
+{
+ void *smram = (void *)(SMM_DEFAULT_BASE);
+ printk(BIOS_SPEW, "%s: enter\n", __func__);
+ /* There can't be more than 1 concurrent save state for the relocation
+ * handler because all CPUs default to 0x30000 as SMBASE. */
+ if (params->num_concurrent_save_states > 1)
+ return -1;
+
+ /* A handler has to be defined to call for relocation. */
+ if (params->handler == NULL)
+ return -1;
+
+ /* Since the relocation handler always uses stack, adjust the number
+ * of concurrent stack users to be CONFIG_MAX_CPUS. */
+ if (params->num_concurrent_stacks == 0)
+ params->num_concurrent_stacks = CONFIG_MAX_CPUS;
+
+ params->smm_main_entry_offset = SMM_ENTRY_OFFSET;
+ params->smram_start = SMM_DEFAULT_BASE;
+ params->smram_end = SMM_DEFAULT_BASE + SMM_DEFAULT_SIZE;
+ return smm_module_setup_stub(smram, SMM_DEFAULT_SIZE,
+ params, fxsave_area_relocation);
+ printk(BIOS_SPEW, "%s: exit\n", __func__);
+}
+
+/*
+ *The SMM module is placed within the provided region in the following
+ * manner:
+ * +-----------------+ <- smram + size
+ * | BIOS resource |
+ * | list (STM) |
+ * +-----------------+
+ * | fxsave area |
+ * +-----------------+
+ * | smi handler |
+ * | ... |
+ * +-----------------+ <- cpu0
+ * | stub code | <- cpu1
+ * | stub code | <- cpu2
+ * | stub code | <- cpu3, etc
+ * | |
+ * | |
+ * | |
+ * | stacks |
+ * +-----------------+ <- smram start
+
+ * It should be noted that this algorithm will not work for
+ * SMM_DEFAULT_SIZE SMRAM regions such as the A segment. This algorithm
+ * expects a region large enough to encompass the handler and stacks
+ * as well as the SMM_DEFAULT_SIZE.
+ */
+int smm_load_module(void *smram, size_t size, struct smm_loader_params *params)
+{
+ struct rmodule smm_mod;
+ size_t total_stack_size;
+ size_t handler_size;
+ size_t module_alignment;
+ size_t alignment_size;
+ size_t fxsave_size;
+ void *fxsave_area;
+ size_t total_size = 0;
+ char *base;
+
+ if (size <= SMM_DEFAULT_SIZE)
+ return -1;
+
+ /* Load main SMI handler at the top of SMRAM
+ * everything else will go below
+ */
+ base = smram;
+ base += size;
+ params->smram_start = (uintptr_t)smram;
+ params->smram_end = params->smram_start + size;
+ params->smm_main_entry_offset = SMM_ENTRY_OFFSET;
+
+ /* Fail if can't parse the smm rmodule. */
+ if (rmodule_parse(&_binary_smm_start, &smm_mod))
+ return -1;
+
+ /* Clear SMM region */
+ if (CONFIG(DEBUG_SMI))
+ memset(smram, 0xcd, size);
+
+ total_stack_size = params->per_cpu_stack_size *
+ params->num_concurrent_stacks;
+ total_size += total_stack_size;
+ /* Stacks are the base of SMRAM */
+ params->stack_top = smram + total_stack_size;
+
+ /* MSEG starts at the top of SMRAM and works down */
+ if (CONFIG(STM)) {
+ base -= CONFIG_MSEG_SIZE + CONFIG_BIOS_RESOURCE_LIST_SIZE;
+ total_size += CONFIG_MSEG_SIZE + CONFIG_BIOS_RESOURCE_LIST_SIZE;
+ }
+
+ /* FXSAVE goes below MSEG */
+ if (CONFIG(SSE)) {
+ fxsave_size = FXSAVE_SIZE * params->num_concurrent_stacks;
+ fxsave_area = base - fxsave_size;
+ base -= fxsave_size;
+ total_size += fxsave_size;
+ } else {
+ fxsave_size = 0;
+ fxsave_area = NULL;
+ }
+
+
+ handler_size = rmodule_memory_size(&smm_mod);
+ base -= handler_size;
+ total_size += handler_size;
+ module_alignment = rmodule_load_alignment(&smm_mod);
+ alignment_size = module_alignment -
+ ((uintptr_t)base % module_alignment);
+ if (alignment_size != module_alignment) {
+ handler_size += alignment_size;
+ base += alignment_size;
+ }
+
+ printk(BIOS_DEBUG,
+ "%s: total_smm_space_needed %zx, available -> %zx\n",
+ __func__, total_size, size);
+
+ /* Does the required amount of memory exceed the SMRAM region size? */
+ if (total_size > size) {
+ printk(BIOS_ERR, "%s: need more SMRAM\n", __func__);
+ return -1;
+ }
+ if (handler_size > SMM_CODE_SEGMENT_SIZE) {
+ printk(BIOS_ERR, "%s: increase SMM_CODE_SEGMENT_SIZE: handler_size = %zx\n",
+ __func__, handler_size);
+ return -1;
+ }
+
+ if (rmodule_load(base, &smm_mod))
+ return -1;
+
+ params->handler = rmodule_entry(&smm_mod);
+ params->handler_arg = rmodule_parameters(&smm_mod);
+
+ printk(BIOS_DEBUG, "%s: smram_start: 0x%p\n",
+ __func__, smram);
+ printk(BIOS_DEBUG, "%s: smram_end: %p\n",
+ __func__, smram + size);
+ printk(BIOS_DEBUG, "%s: stack_top: %p\n",
+ __func__, params->stack_top);
+ 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: handler_arg %p\n",
+ __func__, params->handler_arg);
+ printk(BIOS_DEBUG, "%s: fxsave_area %p\n",
+ __func__, fxsave_area);
+ printk(BIOS_DEBUG, "%s: fxsave_size %zx\n",
+ __func__, fxsave_size);
+ printk(BIOS_DEBUG, "%s: CONFIG_MSEG_SIZE 0x%x\n",
+ __func__, CONFIG_MSEG_SIZE);
+ printk(BIOS_DEBUG, "%s: CONFIG_BIOS_RESOURCE_LIST_SIZE 0x%x\n",
+ __func__, CONFIG_BIOS_RESOURCE_LIST_SIZE);
+
+ /* CPU 0 smbase goes first, all other CPUs
+ * will be staggered below
+ */
+ base -= SMM_CODE_SEGMENT_SIZE;
+ printk(BIOS_DEBUG, "%s: cpu0 entry: %p\n",
+ __func__, base);
+ params->smm_entry = (uintptr_t)base + params->smm_main_entry_offset;
+ return smm_module_setup_stub(base, size, params, fxsave_area);
+}
diff --git a/src/include/cpu/x86/smm.h b/src/include/cpu/x86/smm.h
index a3101e5155..db63e8be25 100644
--- a/src/include/cpu/x86/smm.h
+++ b/src/include/cpu/x86/smm.h
@@ -128,6 +128,12 @@ static inline bool smm_points_to_smram(const void *ptr, const size_t len)
* into this field so the code doing the loading can manipulate the
* runtime's assumptions. e.g. updating the APIC id to CPU map to
* handle sparse APIC id space.
+ * The following parameters are only used when X86_SMM_LOADER_VERSION2 is enabled.
+ * - smm_entry - entry address of first CPU thread, all others will be tiled
+ * below this address.
+ * - smm_main_entry_offset - default entry offset (e.g 0x8000)
+ * - smram_start - smaram starting address
+ * - smram_end - smram ending address
*/
struct smm_loader_params {
void *stack_top;
@@ -141,12 +147,24 @@ struct smm_loader_params {
void *handler_arg;
struct smm_runtime *runtime;
+
+ /* The following are only used by X86_SMM_LOADER_VERSION2 */
+#if CONFIG(X86_SMM_LOADER_VERSION2)
+ unsigned int smm_entry;
+ unsigned int smm_main_entry_offset;
+ unsigned int smram_start;
+ unsigned int smram_end;
+#endif
};
/* Both of these return 0 on success, < 0 on failure. */
int smm_setup_relocation_handler(struct smm_loader_params *params);
int smm_load_module(void *smram, size_t size, struct smm_loader_params *params);
+#if CONFIG(X86_SMM_LOADER_VERSION2)
+u32 smm_get_cpu_smbase(unsigned int cpu_num);
+#endif
+
/* Backup and restore default SMM region. */
void *backup_default_smm_area(void);
void restore_default_smm_area(void *smm_save_area);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 09:06:37 +0000