diff options
Diffstat (limited to 'src/cpu/intel/smm/gen1/smmrelocate.c')
| -rw-r--r-- | src/cpu/intel/smm/gen1/smmrelocate.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/src/cpu/intel/smm/gen1/smmrelocate.c b/src/cpu/intel/smm/gen1/smmrelocate.c new file mode 100644 index 0000000000..bc14444dbf --- /dev/null +++ b/src/cpu/intel/smm/gen1/smmrelocate.c @@ -0,0 +1,289 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 ChromeOS Authors + * + * 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. + */ + +/* SMM relocation with intention to work for i945-ivybridge. + Right now used for sandybridge and ivybridge. */ + +#include <types.h> +#include <string.h> +#include <device/device.h> +#include <device/pci.h> +#include <cpu/cpu.h> +#include <cpu/x86/cache.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/smm.h> +#include <console/console.h> +#include "smi.h" + +#define SMRR_SUPPORTED (1<<11) + +#define D_OPEN (1 << 6) +#define D_CLS (1 << 5) +#define D_LCK (1 << 4) +#define G_SMRAME (1 << 3) +#define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0)) + +struct ied_header { + char signature[10]; + u32 size; + u8 reserved[34]; +} __attribute__ ((packed)); + + +struct smm_relocation_params { + u32 smram_base; + u32 smram_size; + u32 ied_base; + u32 ied_size; + msr_t smrr_base; + msr_t smrr_mask; +}; + +/* This gets filled in and used during relocation. */ +static struct smm_relocation_params smm_reloc_params; + +static inline void write_smrr(struct smm_relocation_params *relo_params) +{ + printk(BIOS_DEBUG, "Writing SMRR. base = 0x%08x, mask=0x%08x\n", + relo_params->smrr_base.lo, relo_params->smrr_mask.lo); + wrmsr(SMRRphysBase_MSR, relo_params->smrr_base); + wrmsr(SMRRphysMask_MSR, relo_params->smrr_mask); +} + +/* The relocation work is actually performed in SMM context, but the code + * resides in the ramstage module. This occurs by trampolining from the default + * SMRAM entry point to here. */ +static void asmlinkage cpu_smm_do_relocation(void *arg) +{ + em64t101_smm_state_save_area_t *save_state; + msr_t mtrr_cap; + struct smm_relocation_params *relo_params; + const struct smm_module_params *p; + const struct smm_runtime *runtime; + int cpu; + + p = arg; + runtime = p->runtime; + relo_params = p->arg; + cpu = p->cpu; + + if (cpu >= CONFIG_MAX_CPUS) { + printk(BIOS_CRIT, + "Invalid CPU number assigned in SMM stub: %d\n", cpu); + return; + } + + printk(BIOS_DEBUG, "In relocation handler: cpu %d\n", cpu); + + /* All threads need to set IEDBASE and SMBASE in the save state area. + * Since one thread runs at a time during the relocation the save state + * is the same for all cpus. */ + save_state = (void *)(runtime->smbase + SMM_DEFAULT_SIZE - + runtime->save_state_size); + + /* The relocated handler runs with all CPUs concurrently. Therefore + * stagger the entry points adjusting SMBASE downwards by save state + * size * CPU num. */ + save_state->smbase = relo_params->smram_base - + cpu * runtime->save_state_size; + save_state->iedbase = relo_params->ied_base; + + printk(BIOS_DEBUG, "New SMBASE=0x%08x IEDBASE=0x%08x @ %p\n", + save_state->smbase, save_state->iedbase, save_state); + + /* Write SMRR MSRs based on indicated support. */ + mtrr_cap = rdmsr(MTRRcap_MSR); + if (mtrr_cap.lo & SMRR_SUPPORTED) + write_smrr(relo_params); + + southbridge_clear_smi_status(); +} + +static void fill_in_relocation_params(struct smm_relocation_params *params) +{ + u32 tseg_size; + u32 tsegmb; + int phys_bits; + /* All range registers are aligned to 4KiB */ + const u32 rmask = ~((1 << 12) - 1); + + /* Some of the range registers are dependent on the number of physical + * address bits supported. */ + phys_bits = cpuid_eax(0x80000008) & 0xff; + + /* The range bounded by the TSEGMB and BGSM registers encompasses the + * SMRAM range as well as the IED range. However, the SMRAM available + * to the handler is 4MiB since the IEDRAM lives TSEGMB + 4MiB. + */ + northbridge_get_tseg_base_and_size(&tsegmb, &tseg_size); + + params->smram_base = tsegmb; + params->smram_size = 4 << 20; + params->ied_base = tsegmb + params->smram_size; + params->ied_size = tseg_size - params->smram_size; + + /* SMRR has 32-bits of valid address aligned to 4KiB. */ + params->smrr_base.lo = (params->smram_base & rmask) | MTRR_TYPE_WRBACK; + params->smrr_base.hi = 0; + params->smrr_mask.lo = (~(tseg_size - 1) & rmask) | MTRRphysMaskValid; + params->smrr_mask.hi = 0; +} + +static int install_relocation_handler(int *apic_id_map, int num_cpus, + struct smm_relocation_params *relo_params) +{ + /* The default SMM entry happens serially at the default location. + * Therefore, there is only 1 concurrent save state area. Set the + * stack size to the save state size, and call into the + * do_relocation handler. */ + int save_state_size = sizeof(em64t101_smm_state_save_area_t); + struct smm_loader_params smm_params = { + .per_cpu_stack_size = save_state_size, + .num_concurrent_stacks = num_cpus, + .per_cpu_save_state_size = save_state_size, + .num_concurrent_save_states = 1, + .handler = &cpu_smm_do_relocation, + .handler_arg = (void *)relo_params, + }; + + if (smm_setup_relocation_handler(&smm_params)) + return -1; + int i; + for (i = 0; i < num_cpus; i++) { + smm_params.runtime->apic_id_to_cpu[i] = apic_id_map[i]; + } + return 0; +} + +static void setup_ied_area(struct smm_relocation_params *params) +{ + char *ied_base; + + struct ied_header ied = { + .signature = "INTEL RSVD", + .size = params->ied_size, + .reserved = {0}, + }; + + ied_base = (void *)params->ied_base; + + /* Place IED header at IEDBASE. */ + memcpy(ied_base, &ied, sizeof(ied)); + + /* Zero out 32KiB at IEDBASE + 1MiB */ + memset(ied_base + (1 << 20), 0, (32 << 10)); +} + +static int install_permanent_handler(int *apic_id_map, int num_cpus, + struct smm_relocation_params *relo_params) +{ + /* There are num_cpus concurrent stacks and num_cpus concurrent save + * state areas. Lastly, set the stack size to the save state size. */ + int save_state_size = sizeof(em64t101_smm_state_save_area_t); + struct smm_loader_params smm_params = { + .per_cpu_stack_size = save_state_size, + .num_concurrent_stacks = num_cpus, + .per_cpu_save_state_size = save_state_size, + .num_concurrent_save_states = num_cpus, + }; + + printk(BIOS_DEBUG, "Installing SMM handler to 0x%08x\n", + relo_params->smram_base); + if (smm_load_module((void *)relo_params->smram_base, + relo_params->smram_size, &smm_params)) + return -1; + int i; + for (i = 0; i < num_cpus; i++) { + smm_params.runtime->apic_id_to_cpu[i] = apic_id_map[i]; + } + return 0; +} + +static int cpu_smm_setup(void) +{ + int num_cpus; + int apic_id_map[CONFIG_MAX_CPUS]; + + printk(BIOS_DEBUG, "Setting up SMI for CPU\n"); + + fill_in_relocation_params(&smm_reloc_params); + + /* enable the SMM memory window */ + northbridge_write_smram(D_OPEN | G_SMRAME | C_BASE_SEG); + + setup_ied_area(&smm_reloc_params); + + num_cpus = cpu_get_apic_id_map(apic_id_map); + if (num_cpus > CONFIG_MAX_CPUS) { + printk(BIOS_CRIT, + "Error: Hardware CPUs (%d) > MAX_CPUS (%d)\n", + num_cpus, CONFIG_MAX_CPUS); + } + + if (install_relocation_handler(apic_id_map, num_cpus, &smm_reloc_params)) { + printk(BIOS_CRIT, "SMM Relocation handler install failed.\n"); + return -1; + } + + if (install_permanent_handler(apic_id_map, num_cpus, &smm_reloc_params)) { + printk(BIOS_CRIT, "SMM Permanent handler install failed.\n"); + return -1; + } + + /* Ensure the SMM handlers hit DRAM before performing first SMI. */ + /* TODO(adurbin): Is this really needed? */ + wbinvd(); + + /* close the SMM memory window and enable normal SMM */ + northbridge_write_smram(G_SMRAME | C_BASE_SEG); + + return 0; +} + +void smm_init(void) +{ + /* Return early if CPU SMM setup failed. */ + if (cpu_smm_setup()) + return; + + southbridge_smm_init(); + + /* Initiate first SMI to kick off SMM-context relocation. Note: this + * SMI being triggered here queues up an SMI in the APs which are in + * wait-for-SIPI state. Once an AP gets an SIPI it will service the SMI + * at the SMM_DEFAULT_BASE before jumping to startup vector. */ + southbridge_trigger_smi(); + + printk(BIOS_DEBUG, "Relocation complete.\n"); + + /* Lock down the SMRAM space. */ + smm_lock(); +} + +void smm_lock(void) +{ + /* LOCK the SMM memory window and enable normal SMM. + * After running this function, only a full reset can + * make the SMM registers writable again. + */ + printk(BIOS_DEBUG, "Locking SMM.\n"); + + northbridge_write_smram(D_LCK | G_SMRAME | C_BASE_SEG); +} |