| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #define __SIMPLE_DEVICE__ |
| |
| #include <arch/romstage.h> |
| #include <commonlib/helpers.h> |
| #include <device/pci_ops.h> |
| #include <device/device.h> |
| #include <device/pci_def.h> |
| #include <console/console.h> |
| #include <cbmem.h> |
| #include <northbridge/intel/pineview/pineview.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/smm.h> |
| #include <cpu/intel/smm_reloc.h> |
| #include <types.h> |
| |
| /** Decodes used Graphics Mode Select (GMS) to kilobytes. */ |
| u32 decode_igd_memory_size(const u32 gms) |
| { |
| const u32 gmssize[] = {0, 1, 4, 8, 16, 32, 48, 64, 128, 256}; |
| |
| if (gms > 9) { |
| printk(BIOS_DEBUG, "Bad Graphics Mode Select (GMS) value.\n"); |
| return 0; |
| } |
| return gmssize[gms] << 10; |
| } |
| |
| /** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */ |
| u32 decode_igd_gtt_size(const u32 gsm) |
| { |
| const u8 gsmsize[] = {0, 1, 0, 0}; |
| |
| if (gsm > 3) { |
| printk(BIOS_DEBUG, "Bad Graphics Stolen Memory (GSM) value.\n"); |
| return 0; |
| } |
| return (u32)(gsmsize[gsm] << 10); |
| } |
| |
| /** Decodes used TSEG size to bytes. */ |
| static u32 decode_tseg_size(const u32 esmramc) |
| { |
| if (!(esmramc & 1)) |
| return 0; |
| |
| switch ((esmramc >> 1) & 3) { |
| case 0: |
| return 1 * MiB; |
| case 1: |
| return 2 * MiB; |
| case 2: |
| return 8 * MiB; |
| case 3: |
| default: |
| die("Bad TSEG setting.\n"); |
| } |
| } |
| |
| static size_t northbridge_get_tseg_size(void) |
| { |
| const u8 esmramc = pci_read_config8(HOST_BRIDGE, ESMRAMC); |
| return decode_tseg_size(esmramc); |
| } |
| |
| static uintptr_t northbridge_get_tseg_base(void) |
| { |
| return pci_read_config32(HOST_BRIDGE, TSEG); |
| } |
| |
| /* |
| * Depending of UMA and TSEG configuration, TSEG might start at any 1 MiB alignment. |
| * As this may cause very greedy MTRR setup, push CBMEM top downwards to 4 MiB boundary. |
| */ |
| uintptr_t cbmem_top_chipset(void) |
| { |
| return ALIGN_DOWN(northbridge_get_tseg_base(), 4 * MiB); |
| |
| } |
| |
| void smm_region(uintptr_t *start, size_t *size) |
| { |
| *start = northbridge_get_tseg_base(); |
| *size = northbridge_get_tseg_size(); |
| } |
| |
| void fill_postcar_frame(struct postcar_frame *pcf) |
| { |
| uintptr_t top_of_ram; |
| |
| /* |
| * Cache 8 MiB region below the top of RAM and 2 MiB above top of RAM to cover both |
| * CBMEM and the TSEG region. |
| */ |
| top_of_ram = (uintptr_t)cbmem_top(); |
| postcar_frame_add_mtrr(pcf, top_of_ram - 8 * MiB, 8 * MiB, MTRR_TYPE_WRBACK); |
| postcar_frame_add_mtrr(pcf, northbridge_get_tseg_base(), northbridge_get_tseg_size(), |
| MTRR_TYPE_WRBACK); |
| } |