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-rw-r--r--src/cpu/x86/Kconfig7
-rw-r--r--src/cpu/x86/Makefile.inc25
-rw-r--r--src/cpu/x86/mp_init.c586
-rw-r--r--src/cpu/x86/sipi_header.c6
-rw-r--r--src/cpu/x86/sipi_vector.S192
5 files changed, 816 insertions, 0 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index c64a8e477b..21282c321a 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -115,3 +115,10 @@ config X86_AMD_FIXED_MTRRS
help
This option informs the MTRR code to use the RdMem and WrMem fields
in the fixed MTRR MSRs.
+
+config PARALLEL_MP
+ def_bool n
+ help
+ This option uses common MP infrastructure for bringing up APs
+ in parallel. It additionally provides a more flexible mechanism
+ for sequencing the steps of bringing up the APs.
diff --git a/src/cpu/x86/Makefile.inc b/src/cpu/x86/Makefile.inc
index ca755dec5d..d5bc2fd219 100644
--- a/src/cpu/x86/Makefile.inc
+++ b/src/cpu/x86/Makefile.inc
@@ -1,2 +1,27 @@
romstage-$(CONFIG_EARLY_CBMEM_INIT) += car.c
romstage-$(CONFIG_HAVE_ACPI_RESUME) += car.c
+
+subdirs-$(CONFIG_PARALLEL_MP) += name
+ramstage-$(CONFIG_PARALLEL_MP) += mp_init.c
+
+SIPI_ELF=$(obj)/cpu/x86/sipi_vector.elf
+SIPI_BIN=$(SIPI_ELF:.elf=)
+SIPI_DOTO=$(SIPI_ELF:.elf=.o)
+
+ifeq ($(CONFIG_PARALLEL_MP),y)
+ramstage-srcs += $(SIPI_BIN)
+endif
+rmodules-$(CONFIG_PARALLEL_MP) += sipi_vector.S
+rmodules-$(CONFIG_PARALLEL_MP) += sipi_header.c
+
+$(SIPI_DOTO): $(dir $(SIPI_ELF))sipi_vector.rmodules.o $(dir $(SIPI_ELF))sipi_header.rmodules.o
+ $(CC) $(LDFLAGS) -nostdlib -r -o $@ $^
+
+$(eval $(call rmodule_link,$(SIPI_ELF), $(SIPI_ELF:.elf=.o), 0))
+
+$(SIPI_BIN): $(SIPI_ELF)
+ $(OBJCOPY) -O binary $< $@
+
+$(SIPI_BIN).ramstage.o: $(SIPI_BIN)
+ @printf " OBJCOPY $(subst $(obj)/,,$(@))\n"
+ cd $(dir $@); $(OBJCOPY) -I binary $(notdir $<) -O elf32-i386 -B i386 $(notdir $@)
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
new file mode 100644
index 0000000000..242d656144
--- /dev/null
+++ b/src/cpu/x86/mp_init.c
@@ -0,0 +1,586 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <stdint.h>
+#include <rmodule.h>
+#include <arch/cpu.h>
+#include <cpu/cpu.h>
+#include <cpu/intel/microcode.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/lapic.h>
+#include <cpu/x86/name.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
+#include <cpu/x86/mp.h>
+#include <delay.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <lib.h>
+#include <smp/atomic.h>
+#include <smp/spinlock.h>
+#include <thread.h>
+
+#define MAX_APIC_IDS 256
+/* This needs to match the layout in the .module_parametrs section. */
+struct sipi_params {
+ uint16_t gdtlimit;
+ uint32_t gdt;
+ uint16_t unused;
+ uint32_t idt_ptr;
+ uint32_t stack_top;
+ uint32_t stack_size;
+ uint32_t microcode_lock; /* 0xffffffff means parallel loading. */
+ uint32_t microcode_ptr;
+ uint32_t msr_table_ptr;
+ uint32_t msr_count;
+ uint32_t c_handler;
+ atomic_t ap_count;
+} __attribute__((packed));
+
+/* This also needs to match the assembly code for saved MSR encoding. */
+struct saved_msr {
+ uint32_t index;
+ uint32_t lo;
+ uint32_t hi;
+} __attribute__((packed));
+
+
+/* The sipi vector rmodule is included in the ramstage using 'objdump -B'. */
+extern char _binary_sipi_vector_start[];
+/* These symbols are defined in c_start.S. */
+extern char gdt[];
+extern char gdt_end[];
+extern char idtarg[];
+
+/* The SIPI vector is loaded at the SMM_DEFAULT_BASE. The reason is at the
+ * memory range is already reserved so the OS cannot use it. That region is
+ * free to use for AP bringup before SMM is initialized. */
+static const uint32_t sipi_vector_location = SMM_DEFAULT_BASE;
+static const int sipi_vector_location_size = SMM_DEFAULT_SIZE;
+
+struct mp_flight_plan {
+ int num_records;
+ struct mp_flight_record *records;
+};
+
+static struct mp_flight_plan mp_info;
+
+struct cpu_map {
+ device_t dev;
+ int apic_id;
+};
+
+/* Keep track of apic and device structure for each cpu. */
+static struct cpu_map cpus[CONFIG_MAX_CPUS];
+
+static inline void barrier_wait(atomic_t *b)
+{
+ while (atomic_read(b) == 0) {
+ asm ("pause");
+ }
+ mfence();
+}
+
+static inline void release_barrier(atomic_t *b)
+{
+ mfence();
+ atomic_set(b, 1);
+}
+
+/* Returns 1 if timeout waiting for APs. 0 if target aps found. */
+static int wait_for_aps(atomic_t *val, int target, int total_delay,
+ int delay_step)
+{
+ int timeout = 0;
+ int delayed = 0;
+ while (atomic_read(val) != target) {
+ udelay(delay_step);
+ delayed += delay_step;
+ if (delayed >= total_delay) {
+ timeout = 1;
+ break;
+ }
+ }
+
+ return timeout;
+}
+
+static void ap_do_flight_plan(void)
+{
+ int i;
+
+ for (i = 0; i < mp_info.num_records; i++) {
+ struct mp_flight_record *rec = &mp_info.records[i];
+
+ atomic_inc(&rec->cpus_entered);
+ barrier_wait(&rec->barrier);
+
+ if (rec->ap_call != NULL) {
+ rec->ap_call(rec->ap_arg);
+ }
+ }
+}
+
+/* By the time APs call ap_init() caching has been setup, and microcode has
+ * been loaded. */
+static void asmlinkage ap_init(unsigned int cpu)
+{
+ struct cpu_info *info;
+ int apic_id;
+
+ /* Ensure the local apic is enabled */
+ enable_lapic();
+
+ info = cpu_info();
+ info->index = cpu;
+ info->cpu = cpus[cpu].dev;
+ thread_init_cpu_info_non_bsp(info);
+
+ apic_id = lapicid();
+ info->cpu->path.apic.apic_id = apic_id;
+ cpus[cpu].apic_id = apic_id;
+
+ printk(BIOS_INFO, "AP: slot %d apic_id %x.\n", cpu, apic_id);
+
+ /* Walk the flight plan */
+ ap_do_flight_plan();
+
+ /* Park the AP. */
+ stop_this_cpu();
+}
+
+static void setup_default_sipi_vector_params(struct sipi_params *sp)
+{
+ sp->gdt = (uint32_t)&gdt;
+ sp->gdtlimit = (uint32_t)&gdt_end - (u32)&gdt - 1;
+ sp->idt_ptr = (uint32_t)&idtarg;
+ sp->stack_size = CONFIG_STACK_SIZE;
+ sp->stack_top = (uint32_t)&_estack;
+ /* Adjust the stack top to take into account cpu_info. */
+ sp->stack_top -= sizeof(struct cpu_info);
+}
+
+#define NUM_FIXED_MTRRS 11
+static const unsigned int fixed_mtrrs[NUM_FIXED_MTRRS] = {
+ MTRRfix64K_00000_MSR, MTRRfix16K_80000_MSR, MTRRfix16K_A0000_MSR,
+ MTRRfix4K_C0000_MSR, MTRRfix4K_C8000_MSR, MTRRfix4K_D0000_MSR,
+ MTRRfix4K_D8000_MSR, MTRRfix4K_E0000_MSR, MTRRfix4K_E8000_MSR,
+ MTRRfix4K_F0000_MSR, MTRRfix4K_F8000_MSR,
+};
+
+static inline struct saved_msr *save_msr(int index, struct saved_msr *entry)
+{
+ msr_t msr;
+
+ msr = rdmsr(index);
+ entry->index = index;
+ entry->lo = msr.lo;
+ entry->hi = msr.hi;
+
+ /* Return the next entry. */
+ entry++;
+ return entry;
+}
+
+static int save_bsp_msrs(char *start, int size)
+{
+ int msr_count;
+ int num_var_mtrrs;
+ struct saved_msr *msr_entry;
+ int i;
+ msr_t msr;
+
+ /* Determine number of MTRRs need to be saved. */
+ msr = rdmsr(MTRRcap_MSR);
+ num_var_mtrrs = msr.lo & 0xff;
+
+ /* 2 * num_var_mtrrs for base and mask. +1 for IA32_MTRR_DEF_TYPE. */
+ msr_count = 2 * num_var_mtrrs + NUM_FIXED_MTRRS + 1;
+
+ if ((msr_count * sizeof(struct saved_msr)) > size) {
+ printk(BIOS_CRIT, "Cannot mirror all %d msrs.\n", msr_count);
+ return -1;
+ }
+
+ msr_entry = (void *)start;
+ for (i = 0; i < NUM_FIXED_MTRRS; i++) {
+ msr_entry = save_msr(fixed_mtrrs[i], msr_entry);
+ }
+
+ for (i = 0; i < num_var_mtrrs; i++) {
+ msr_entry = save_msr(MTRRphysBase_MSR(i), msr_entry);
+ msr_entry = save_msr(MTRRphysMask_MSR(i), msr_entry);
+ }
+
+ msr_entry = save_msr(MTRRdefType_MSR, msr_entry);
+
+ return msr_count;
+}
+
+static atomic_t *load_sipi_vector(struct mp_params *mp_params)
+{
+ struct rmodule sipi_mod;
+ int module_size;
+ int num_msrs;
+ struct sipi_params *sp;
+ char *mod_loc = (void *)sipi_vector_location;
+ const int loc_size = sipi_vector_location_size;
+ atomic_t *ap_count = NULL;
+
+ if (rmodule_parse(&_binary_sipi_vector_start, &sipi_mod)) {
+ printk(BIOS_CRIT, "Unable to parse sipi module.\n");
+ return ap_count;
+ }
+
+ if (rmodule_entry_offset(&sipi_mod) != 0) {
+ printk(BIOS_CRIT, "SIPI module entry offset is not 0!\n");
+ return ap_count;
+ }
+
+ if (rmodule_load_alignment(&sipi_mod) != 4096) {
+ printk(BIOS_CRIT, "SIPI module load alignment(%d) != 4096.\n",
+ rmodule_load_alignment(&sipi_mod));
+ return ap_count;
+ }
+
+ module_size = rmodule_memory_size(&sipi_mod);
+
+ /* Align to 4 bytes. */
+ module_size = ALIGN(module_size, 4);
+
+ if (module_size > loc_size) {
+ printk(BIOS_CRIT, "SIPI module size (%d) > region size (%d).\n",
+ module_size, loc_size);
+ return ap_count;
+ }
+
+ num_msrs = save_bsp_msrs(&mod_loc[module_size], loc_size - module_size);
+
+ if (num_msrs < 0) {
+ printk(BIOS_CRIT, "Error mirroring BSP's msrs.\n");
+ return ap_count;
+ }
+
+ if (rmodule_load(mod_loc, &sipi_mod)) {
+ printk(BIOS_CRIT, "Unable to load SIPI module.\n");
+ return ap_count;
+ }
+
+ sp = rmodule_parameters(&sipi_mod);
+
+ if (sp == NULL) {
+ printk(BIOS_CRIT, "SIPI module has no parameters.\n");
+ return ap_count;
+ }
+
+ setup_default_sipi_vector_params(sp);
+ /* Setup MSR table. */
+ sp->msr_table_ptr = (uint32_t)&mod_loc[module_size];
+ sp->msr_count = num_msrs;
+ /* Provide pointer to microcode patch. */
+ sp->microcode_ptr = (uint32_t)mp_params->microcode_pointer;
+ /* Pass on abiility to load microcode in parallel. */
+ if (mp_params->parallel_microcode_load) {
+ sp->microcode_lock = 0;
+ } else {
+ sp->microcode_lock = ~0;
+ }
+ sp->c_handler = (uint32_t)&ap_init;
+ ap_count = &sp->ap_count;
+ atomic_set(ap_count, 0);
+
+ return ap_count;
+}
+
+static int allocate_cpu_devices(struct bus *cpu_bus, struct mp_params *p)
+{
+ int i;
+ int max_cpus;
+ struct cpu_info *info;
+
+ max_cpus = p->num_cpus;
+ if (max_cpus > CONFIG_MAX_CPUS) {
+ printk(BIOS_CRIT, "CPU count(%d) exceeds CONFIG_MAX_CPUS(%d)\n",
+ max_cpus, CONFIG_MAX_CPUS);
+ max_cpus = CONFIG_MAX_CPUS;
+ }
+
+ info = cpu_info();
+ for (i = 1; i < max_cpus; i++) {
+ struct device_path cpu_path;
+ device_t new;
+ int apic_id;
+
+ /* Build the cpu device path */
+ cpu_path.type = DEVICE_PATH_APIC;
+
+ /* Assuming linear APIC space allocation. */
+ apic_id = info->cpu->path.apic.apic_id + i;
+ if (p->adjust_apic_id != NULL) {
+ apic_id = p->adjust_apic_id(i, apic_id);
+ }
+ cpu_path.apic.apic_id = apic_id;
+
+ /* Allocate the new cpu device structure */
+ new = alloc_find_dev(cpu_bus, &cpu_path);
+ if (new == NULL) {
+ printk(BIOS_CRIT, "Could not allocte cpu device\n");
+ max_cpus--;
+ }
+ cpus[i].dev = new;
+ }
+
+ return max_cpus;
+}
+
+/* Returns 1 for timeout. 0 on success. */
+static int apic_wait_timeout(int total_delay, int delay_step)
+{
+ int total = 0;
+ int timeout = 0;
+
+ while (lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY) {
+ udelay(delay_step);
+ total += delay_step;
+ if (total >= total_delay) {
+ timeout = 1;
+ break;
+ }
+ }
+
+ return timeout;
+}
+
+static int start_aps(struct bus *cpu_bus, int ap_count, atomic_t *num_aps)
+{
+ int sipi_vector;
+ /* Max location is 4KiB below 1MiB */
+ const int max_vector_loc = ((1 << 20) - (1 << 12)) >> 12;
+
+ if (ap_count == 0)
+ return 0;
+
+ /* The vector is sent as a 4k aligned address in one byte. */
+ sipi_vector = sipi_vector_location >> 12;
+
+ if (sipi_vector > max_vector_loc) {
+ printk(BIOS_CRIT, "SIPI vector too large! 0x%08x\n",
+ sipi_vector);
+ return -1;
+ }
+
+ printk(BIOS_DEBUG, "Attempting to start %d APs\n", ap_count);
+
+ if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
+ printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
+ if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
+ printk(BIOS_DEBUG, "timed out. Aborting.\n");
+ return -1;
+ } else
+ printk(BIOS_DEBUG, "done.\n");
+ }
+
+ /* Send INIT IPI to all but self. */
+ lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(0));
+ lapic_write_around(LAPIC_ICR, LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT |
+ LAPIC_DM_INIT);
+ printk(BIOS_DEBUG, "Waiting for 10ms after sending INIT.\n");
+ mdelay(10);
+
+ /* Send 1st SIPI */
+ if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
+ printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
+ if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
+ printk(BIOS_DEBUG, "timed out. Aborting.\n");
+ return -1;
+ } else
+ printk(BIOS_DEBUG, "done.\n");
+ }
+
+ lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(0));
+ lapic_write_around(LAPIC_ICR, LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT |
+ LAPIC_DM_STARTUP | sipi_vector);
+ printk(BIOS_DEBUG, "Waiting for 1st SIPI to complete...");
+ if (apic_wait_timeout(10000 /* 10 ms */, 50 /* us */)) {
+ printk(BIOS_DEBUG, "timed out.\n");
+ return -1;
+ } else {
+ printk(BIOS_DEBUG, "done.\n");
+ }
+
+ /* Wait for CPUs to check in up to 200 us. */
+ wait_for_aps(num_aps, ap_count, 200 /* us */, 15 /* us */);
+
+ /* Send 2nd SIPI */
+ if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
+ printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
+ if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
+ printk(BIOS_DEBUG, "timed out. Aborting.\n");
+ return -1;
+ } else
+ printk(BIOS_DEBUG, "done.\n");
+ }
+
+ lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(0));
+ lapic_write_around(LAPIC_ICR, LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT |
+ LAPIC_DM_STARTUP | sipi_vector);
+ printk(BIOS_DEBUG, "Waiting for 2nd SIPI to complete...");
+ if (apic_wait_timeout(10000 /* 10 ms */, 50 /* us */)) {
+ printk(BIOS_DEBUG, "timed out.\n");
+ return -1;
+ } else {
+ printk(BIOS_DEBUG, "done.\n");
+ }
+
+ /* Wait for CPUs to check in. */
+ if (wait_for_aps(num_aps, ap_count, 10000 /* 10 ms */, 50 /* us */)) {
+ printk(BIOS_DEBUG, "Not all APs checked in: %d/%d.\n",
+ atomic_read(num_aps), ap_count);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int bsp_do_flight_plan(struct mp_params *mp_params)
+{
+ int i;
+ int ret = 0;
+ const int timeout_us = 100000;
+ const int step_us = 100;
+ int num_aps = mp_params->num_cpus - 1;
+
+ for (i = 0; i < mp_params->num_records; i++) {
+ struct mp_flight_record *rec = &mp_params->flight_plan[i];
+
+ /* Wait for APs if the record is not released. */
+ if (atomic_read(&rec->barrier) == 0) {
+ /* Wait for the APs to check in. */
+ if (wait_for_aps(&rec->cpus_entered, num_aps,
+ timeout_us, step_us)) {
+ printk(BIOS_ERR, "MP record %d timeout.\n", i);
+ ret = -1;
+ }
+ }
+
+ if (rec->bsp_call != NULL) {
+ rec->bsp_call(rec->bsp_arg);
+ }
+
+ release_barrier(&rec->barrier);
+ }
+ return ret;
+}
+
+static void init_bsp(struct bus *cpu_bus)
+{
+ struct device_path cpu_path;
+ struct cpu_info *info;
+ char processor_name[49];
+
+ /* Print processor name */
+ fill_processor_name(processor_name);
+ printk(BIOS_INFO, "CPU: %s.\n", processor_name);
+
+ /* Ensure the local apic is enabled */
+ enable_lapic();
+
+ /* Set the device path of the boot cpu. */
+ cpu_path.type = DEVICE_PATH_APIC;
+ cpu_path.apic.apic_id = lapicid();
+
+ /* Find the device structure for the boot cpu. */
+ info = cpu_info();
+ info->cpu = alloc_find_dev(cpu_bus, &cpu_path);
+
+ if (info->index != 0)
+ printk(BIOS_CRIT, "BSP index(%d) != 0!\n", info->index);
+
+ /* Track BSP in cpu_map structures. */
+ cpus[info->index].dev = info->cpu;
+ cpus[info->index].apic_id = cpu_path.apic.apic_id;
+}
+
+int mp_init(struct bus *cpu_bus, struct mp_params *p)
+{
+ int num_cpus;
+ int num_aps;
+ atomic_t *ap_count;
+
+ init_bsp(cpu_bus);
+
+ if (p == NULL || p->flight_plan == NULL || p->num_records < 1) {
+ printk(BIOS_CRIT, "Invalid MP parameters\n");
+ return -1;
+ }
+
+ /* Default to currently running CPU. */
+ num_cpus = allocate_cpu_devices(cpu_bus, p);
+
+ if (num_cpus < p->num_cpus) {
+ printk(BIOS_CRIT,
+ "ERROR: More cpus requested (%d) than supported (%d).\n",
+ p->num_cpus, num_cpus);
+ return -1;
+ }
+
+ /* Copy needed parameters so that APs have a reference to the plan. */
+ mp_info.num_records = p->num_records;
+ mp_info.records = p->flight_plan;
+
+ /* Load the SIPI vector. */
+ ap_count = load_sipi_vector(p);
+ if (ap_count == NULL)
+ return -1;
+
+ /* Make sure SIPI data hits RAM so the APs that come up will see
+ * the startup code even if the caches are disabled. */
+ wbinvd();
+
+ /* Start the APs providing number of APs and the cpus_entered field. */
+ num_aps = p->num_cpus - 1;
+ if (start_aps(cpu_bus, num_aps, ap_count) < 0) {
+ mdelay(1000);
+ printk(BIOS_DEBUG, "%d/%d eventually checked in?\n",
+ atomic_read(ap_count), num_aps);
+ return -1;
+ }
+
+ /* Walk the flight plan for the BSP. */
+ return bsp_do_flight_plan(p);
+}
+
+void mp_initialize_cpu(void *unused)
+{
+ /* Call back into driver infrastructure for the AP initialization. */
+ struct cpu_info *info = cpu_info();
+ cpu_initialize(info->index);
+}
+
+int mp_get_apic_id(int cpu_slot)
+{
+ if (cpu_slot >= CONFIG_MAX_CPUS || cpu_slot < 0)
+ return -1;
+
+ return cpus[cpu_slot].apic_id;
+}
diff --git a/src/cpu/x86/sipi_header.c b/src/cpu/x86/sipi_header.c
new file mode 100644
index 0000000000..846a82d7c2
--- /dev/null
+++ b/src/cpu/x86/sipi_header.c
@@ -0,0 +1,6 @@
+#include <rmodule.h>
+
+
+extern void *ap_start;
+
+DEFINE_RMODULE_HEADER(sipi_vector_header, ap_start, RMODULE_TYPE_SIPI_VECTOR);
diff --git a/src/cpu/x86/sipi_vector.S b/src/cpu/x86/sipi_vector.S
new file mode 100644
index 0000000000..52b12d0314
--- /dev/null
+++ b/src/cpu/x86/sipi_vector.S
@@ -0,0 +1,192 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+/* The SIPI vector is responsible for initializing the APs in the sytem. It
+ * loads microcode, sets up MSRs, and enables caching before calling into
+ * C code. */
+
+/* These segment selectors need to match the gdt entries in c_start.S. */
+#define CODE_SEG 0x10
+#define DATA_SEG 0x18
+
+#define IA32_UPDT_TRIG 0x79
+#define IA32_BIOS_SIGN_ID 0x8b
+
+.section ".module_parameters", "aw", @progbits
+ap_start_params:
+gdtaddr:
+.word 0 /* limit */
+.long 0 /* table */
+.word 0 /* unused */
+idt_ptr:
+.long 0
+stack_top:
+.long 0
+stack_size:
+.long 0
+microcode_lock:
+.long 0
+microcode_ptr:
+.long 0
+msr_table_ptr:
+.long 0
+msr_count:
+.long 0
+c_handler:
+.long 0
+ap_count:
+.long 0
+
+.text
+.code16
+.global ap_start
+ap_start:
+ cli
+ xorl %eax, %eax
+ movl %eax, %cr3 /* Invalidate TLB*/
+
+ /* On hyper threaded cpus, invalidating the cache here is
+ * very very bad. Don't.
+ */
+
+ /* setup the data segment */
+ movw %cs, %ax
+ movw %ax, %ds
+
+ /* The gdtaddr needs to be releative to the data segment in order
+ * to properly dereference it. The .text section comes first in an
+ * rmodule so ap_start can be used as a proxy for the load address. */
+ movl $(gdtaddr), %ebx
+ sub $(ap_start), %ebx
+
+ data32 lgdt (%ebx)
+
+ movl %cr0, %eax
+ andl $0x7FFAFFD1, %eax /* PG,AM,WP,NE,TS,EM,MP = 0 */
+ orl $0x60000001, %eax /* CD, NW, PE = 1 */
+ movl %eax, %cr0
+
+ ljmpl $CODE_SEG, $1f
+1:
+ .code32
+ movw $DATA_SEG, %ax
+ movw %ax, %ds
+ movw %ax, %es
+ movw %ax, %ss
+ movw %ax, %fs
+ movw %ax, %gs
+
+ /* Load the Interrupt descriptor table */
+ mov idt_ptr, %ebx
+ lidt (%ebx)
+
+ /* Obtain cpu number. */
+ movl ap_count, %eax
+1:
+ movl %eax, %ecx
+ inc %ecx
+ lock cmpxchg %ecx, ap_count
+ jnz 1b
+
+ /* Setup stacks for each CPU. */
+ movl stack_size, %eax
+ mul %ecx
+ movl stack_top, %edx
+ subl %eax, %edx
+ mov %edx, %esp
+ /* Save cpu number. */
+ mov %ecx, %esi
+
+ /* Determine if one should check microcode versions. */
+ mov microcode_ptr, %edi
+ test %edi, %edi
+ jz microcode_done /* Bypass if no microde exists. */
+
+ /* Get the Microcode version. */
+ mov $1, %eax
+ cpuid
+ mov $IA32_BIOS_SIGN_ID, %ecx
+ rdmsr
+ /* If something already loaded skip loading again. */
+ test %edx, %edx
+ jnz microcode_done
+
+ /* Determine if parallel microcode loading is allowed. */
+ cmp $0xffffffff, microcode_lock
+ je load_microcode
+
+ /* Protect microcode loading. */
+lock_microcode:
+ lock bts $0, microcode_lock
+ jc lock_microcode
+
+load_microcode:
+ /* Load new microcode. */
+ mov $IA32_UPDT_TRIG, %ecx
+ xor %edx, %edx
+ mov %edi, %eax
+ /* The microcode pointer is passed in pointing to the header. Adjust
+ * pointer to reflect the payload (header size is 48 bytes). */
+ add $48, %eax
+ pusha
+ wrmsr
+ popa
+
+ /* Unconditionally unlock microcode loading. */
+ cmp $0xffffffff, microcode_lock
+ je microcode_done
+
+ xor %eax, %eax
+ mov %eax, microcode_lock
+
+microcode_done:
+ /*
+ * Load MSRs. Each entry in the table consists of:
+ * 0: index,
+ * 4: value[31:0]
+ * 8: value[63:32]
+ */
+ mov msr_table_ptr, %edi
+ mov msr_count, %ebx
+ test %ebx, %ebx
+ jz 1f
+load_msr:
+ mov (%edi), %ecx
+ mov 4(%edi), %eax
+ mov 8(%edi), %edx
+ wrmsr
+ add $12, %edi
+ dec %ebx
+ jnz load_msr
+
+1:
+ /* Enable caching. */
+ mov %cr0, %eax
+ and $0x9fffffff, %eax /* CD, NW = 0 */
+ mov %eax, %cr0
+
+ /* c_handler(cpu_num) */
+ push %esi /* cpu_num */
+ mov c_handler, %eax
+ call *%eax
+halt_jump:
+ hlt
+ jmp halt_jump
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-28 08:47:42 +0000