| /* |
| * 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. |
| */ |
| |
| /* 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(SMRR_PHYS_BASE, relo_params->smrr_base); |
| wrmsr(SMRR_PHYS_MASK, 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(MTRR_CAP_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) |
| { |
| /* All range registers are aligned to 4KiB */ |
| const u32 rmask = ~((1 << 12) - 1); |
| |
| const u32 tsegmb = northbridge_get_tseg_base(); |
| /* TSEG base is usually aligned down (to 8MiB). So we can't |
| derive the TSEG size from the distance to GTT but use the |
| configuration value instead. */ |
| const u32 tseg_size = CONFIG_SMM_TSEG_SIZE; |
| |
| /* The SMRAM available to the handler is 4MiB |
| since the IEDRAM lives at TSEGMB + 4MiB. */ |
| 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) | MTRR_PHYS_MASK_VALID; |
| 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); |
| } |