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/* 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"
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