| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #define __SIMPLE_DEVICE__ |
| |
| #include <console/console.h> |
| #include <cpu/x86/smm.h> |
| #include <device/pci_ops.h> |
| #include <mainboard/emulation/qemu-i440fx/memory.h> |
| #include <mainboard/emulation/qemu-i440fx/fw_cfg.h> |
| |
| #define EXT_TSEG_MBYTES 0x50 |
| |
| #define SMRAMC 0x9d |
| #define G_SMRAME (1 << 3) |
| #define D_LCK (1 << 4) |
| #define D_CLS (1 << 5) |
| #define D_OPEN (1 << 6) |
| #define ESMRAMC 0x9e |
| #define T_EN (1 << 0) |
| #define TSEG_SZ_MASK (3 << 1) |
| #define H_SMRAME (1 << 7) |
| |
| void smm_region(uintptr_t *start, size_t *size) |
| { |
| uint8_t esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC); |
| |
| switch ((esmramc & TSEG_SZ_MASK) >> 1) { |
| case 0: |
| *size = 1 * MiB; |
| break; |
| case 1: |
| *size = 2 * MiB; |
| break; |
| case 2: |
| *size = 8 * MiB; |
| break; |
| default: |
| *size = pci_read_config16(PCI_DEV(0, 0, 0), EXT_TSEG_MBYTES) * MiB; |
| } |
| |
| *start = qemu_get_memory_size() * KiB - *size; |
| printk(BIOS_SPEW, "SMM_BASE: 0x%08lx, SMM_SIZE: %zu MiB\n", *start, *size / MiB); |
| } |