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Diffstat (limited to 'src/soc/amd/picasso/cpu.c')
| -rw-r--r-- | src/soc/amd/picasso/cpu.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/cpu.c b/src/soc/amd/picasso/cpu.c new file mode 100644 index 0000000000..1d9804d99c --- /dev/null +++ b/src/soc/amd/picasso/cpu.c @@ -0,0 +1,155 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2015-2016 Intel Corp. + * Copyright (C) 2017 Advanced Micro Devices, 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. + */ + +#include <cpu/cpu.h> +#include <cpu/x86/mp.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/msr.h> +#include <cpu/amd/msr.h> +#include <cpu/x86/lapic.h> +#include <device/device.h> +#include <device/pci_ops.h> +#include <soc/pci_devs.h> +#include <soc/cpu.h> +#include <soc/northbridge.h> +#include <soc/smi.h> +#include <soc/iomap.h> +#include <console/console.h> + +/* + * MP and SMM loading initialization. + */ +struct smm_relocation_attrs { + uint32_t smbase; + uint32_t tseg_base; + uint32_t tseg_mask; +}; + +static struct smm_relocation_attrs relo_attrs; + +/* + * Do essential initialization tasks before APs can be fired up - + * + * 1. Prevent race condition in MTRR solution. Enable MTRRs on the BSP. This + * creates the MTRR solution that the APs will use. Otherwise APs will try to + * apply the incomplete solution as the BSP is calculating it. + */ +static void pre_mp_init(void) +{ + x86_setup_mtrrs_with_detect(); + x86_mtrr_check(); +} + +static int get_cpu_count(void) +{ + return (pci_read_config16(SOC_HT_DEV, D18F0_CPU_CNT) & CPU_CNT_MASK) + + 1; +} + +static void get_smm_info(uintptr_t *perm_smbase, size_t *perm_smsize, + size_t *smm_save_state_size) +{ + void *smm_base; + size_t smm_size; + void *handler_base; + size_t handler_size; + + /* Initialize global tracking state. */ + smm_region_info(&smm_base, &smm_size); + smm_subregion(SMM_SUBREGION_HANDLER, &handler_base, &handler_size); + + relo_attrs.smbase = (uint32_t)smm_base; + relo_attrs.tseg_base = relo_attrs.smbase; + relo_attrs.tseg_mask = ALIGN_DOWN(~(smm_size - 1), 128 * KiB); + relo_attrs.tseg_mask |= SMM_TSEG_WB; + + *perm_smbase = (uintptr_t)handler_base; + *perm_smsize = handler_size; + *smm_save_state_size = sizeof(amd64_smm_state_save_area_t); +} + +static void relocation_handler(int cpu, uintptr_t curr_smbase, + uintptr_t staggered_smbase) +{ + msr_t tseg_base, tseg_mask; + amd64_smm_state_save_area_t *smm_state; + + tseg_base.lo = relo_attrs.tseg_base; + tseg_base.hi = 0; + wrmsr(SMM_ADDR_MSR, tseg_base); + tseg_mask.lo = relo_attrs.tseg_mask; + tseg_mask.hi = ((1 << (cpu_phys_address_size() - 32)) - 1); + wrmsr(SMM_MASK_MSR, tseg_mask); + smm_state = (void *)(SMM_AMD64_SAVE_STATE_OFFSET + curr_smbase); + smm_state->smbase = staggered_smbase; +} + +static const struct mp_ops mp_ops = { + .pre_mp_init = pre_mp_init, + .get_cpu_count = get_cpu_count, + .get_smm_info = get_smm_info, + .relocation_handler = relocation_handler, + .post_mp_init = enable_smi_generation, +}; + +void stoney_init_cpus(struct device *dev) +{ + /* Clear for take-off */ + if (mp_init_with_smm(dev->link_list, &mp_ops) < 0) + printk(BIOS_ERR, "MP initialization failure.\n"); + + /* The flash is now no longer cacheable. Reset to WP for performance. */ + mtrr_use_temp_range(FLASH_BASE_ADDR, CONFIG_ROM_SIZE, MTRR_TYPE_WRPROT); + + set_warm_reset_flag(); +} + +static void model_15_init(struct device *dev) +{ + check_mca(); + setup_lapic(); + + /* + * Per AMD, sync an undocumented MSR with the PSP base address. + * Experiments showed that if you write to the MSR after it has + * been previously programmed, it causes a general protection fault. + * Also, the MSR survives warm reset and S3 cycles, so we need to + * test if it was previously written before writing to it. + */ + msr_t psp_msr; + uint32_t psp_bar; /* Note: NDA BKDG names this 32-bit register BAR3 */ + psp_bar = pci_read_config32(SOC_PSP_DEV, PCI_BASE_ADDRESS_4); + psp_bar &= ~PCI_BASE_ADDRESS_MEM_ATTR_MASK; + psp_msr = rdmsr(0xc00110a2); + if (psp_msr.lo == 0) { + psp_msr.lo = psp_bar; + wrmsr(0xc00110a2, psp_msr); + } +} + +static struct device_operations cpu_dev_ops = { + .init = model_15_init, +}; + +static struct cpu_device_id cpu_table[] = { + { X86_VENDOR_AMD, 0x670f00 }, + { 0, 0 }, +}; + +static const struct cpu_driver model_15 __cpu_driver = { + .ops = &cpu_dev_ops, + .id_table = cpu_table, +}; |