| /* This file is part of the coreboot project. */ |
| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <device/pci_def.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/cr.h> |
| #include <cpu/x86/post_code.h> |
| |
| #define CBFS_FILE_MAGIC 0 |
| #define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8) |
| #define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4) |
| #define CBFS_FILE_CHECKSUM (CBFS_FILE_TYPE + 4) |
| #define CBFS_FILE_OFFSET (CBFS_FILE_CHECKSUM + 4) |
| |
| .extern temp_ram_init_params |
| |
| .global bootblock_pre_c_entry |
| bootblock_pre_c_entry: |
| |
| .global cache_as_ram |
| cache_as_ram: |
| post_code(0x21) |
| |
| /* find fsp in cbfs */ |
| lea fsp_name, %esi |
| mov $1f, %esp |
| jmp walkcbfs_asm |
| 1: |
| cmp $0, %eax |
| jz .halt_forever |
| mov CBFS_FILE_OFFSET(%eax), %ebx |
| bswap %ebx |
| add %eax, %ebx |
| add $0x94, %ebx |
| |
| /* |
| * save mm2 into ebp, because TempRamInit API doesn't preserve |
| * mm2 register |
| */ |
| movd %mm2, %ebp |
| |
| /* |
| * ebx = FSP INFO HEADER |
| * Calculate entry into FSP |
| */ |
| movl 0x30(%ebx), %eax /* Load TempRamInitEntryOffset */ |
| addl 0x1c(%ebx), %eax /* add the FSP ImageBase */ |
| |
| /* |
| * Pass early init variables on a fake stack (no memory yet) |
| * as well as the return location |
| */ |
| leal CAR_init_stack, %esp |
| |
| /* call FSP binary to setup temporary stack */ |
| jmp *%eax |
| |
| /* |
| * If the TempRamInit API is successful, then when returning, the ECX and |
| * EDX registers will point to the temporary but writeable memory range |
| * available to the bootloader where ECX is the start and EDX is the end of |
| * the range i.e. [ECX,EDX). See FSP Integration Guide for more information. |
| * |
| * Return Values: |
| * EAX | Return Status |
| * ECX | Temporary Memory Start |
| * EDX | Temporary Memory End |
| * EBX, EDI, ESI, EBP, MM0, MM1 | Preserved Through API Call |
| */ |
| |
| CAR_init_done: |
| cmp $0, %eax |
| jnz .halt_forever |
| |
| /* Setup bootblock stack */ |
| mov %edx, %esp |
| |
| /* clear .bss section as it is not shared */ |
| cld |
| xor %eax, %eax |
| movl $(_ebss), %ecx |
| movl $(_bss), %edi |
| sub %edi, %ecx |
| shrl $2, %ecx |
| rep stosl |
| |
| /* Restore the timestamp from bootblock_crt0.S (ebp:mm1) */ |
| push %ebp |
| movd %mm1, %eax |
| push %eax |
| |
| /* We can call into C functions now */ |
| call bootblock_c_entry |
| |
| /* Never reached */ |
| |
| .halt_forever: |
| post_code(POST_DEAD_CODE) |
| hlt |
| jmp .halt_forever |
| |
| CAR_init_stack: |
| .long CAR_init_done |
| .long temp_ram_init_params |
| |
| fsp_name: |
| .string "fspt.bin" |