diff options
Diffstat (limited to 'src/soc/intel/denverton_ns/bootblock/cache_as_ram_fsp.S')
| -rw-r--r-- | src/soc/intel/denverton_ns/bootblock/cache_as_ram_fsp.S | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/soc/intel/denverton_ns/bootblock/cache_as_ram_fsp.S b/src/soc/intel/denverton_ns/bootblock/cache_as_ram_fsp.S new file mode 100644 index 0000000000..b998c21ff7 --- /dev/null +++ b/src/soc/intel/denverton_ns/bootblock/cache_as_ram_fsp.S @@ -0,0 +1,122 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2015 - 2017 Intel Corp. + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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 <device/pci_def.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/cache.h> +#include <cpu/x86/cr.h> +#include <cpu/x86/post_code.h> + +#include <../../../arch/x86/walkcbfs.S> + +#define FSP_HDR_OFFSET 0x94 + +.extern temp_ram_init_params + +.global bootblock_pre_c_entry +bootblock_pre_c_entry: + +.global cache_as_ram +cache_as_ram: + post_code(0x2f) + + /* 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 + + addl $FSP_HDR_OFFSET, %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 Denverton_ns 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 + + /* clear CAR_GLOBAL area as it is not shared */ + cld + xor %eax, %eax + movl $(_car_global_end), %ecx + movl $(_car_global_start), %edi + sub %edi, %ecx + shrl $2, %ecx + rep stosl + + /* Setup bootblock stack */ + movl $(_car_stack_end), %esp + + /* 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 + + .align 4 +CAR_init_stack: + .long CAR_init_done + .long temp_ram_init_params + +fsp_name: + .ascii "fspt.bin\x00" |