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/* SPDX-License-Identifier: GPL-2.0-only */
/******************************************************************************
* AMD Generic Encapsulated Software Architecture
*
* $Workfile:: cache_as_ram.S
*
* Description: cache_as_ram.S - AGESA Module Entry Point for GCC compiler
*
******************************************************************************
*/
#include <cpu/x86/lapic_def.h>
#include <cpu/x86/post_code.h>
.section .init
.code32
.global bootblock_pre_c_entry
_cache_as_ram_setup:
#include "gcccar.inc"
/*
* on entry:
* mm0: BIST (ignored)
* mm2_mm1: timestamp
*/
bootblock_pre_c_entry:
post_code(0xa0)
AMD_ENABLE_STACK
/*
* Set up bootblock stack on BSP.
* AMD_ENABLE_STACK macro sets up a stack for BSP at BSP_STACK_BASE_ADDR
* which is 0x30000 (_car_region_end), but for C bootblock the stack
* begins at _ecar_stack (see arch/x86/car.ld)
*/
mov $LAPIC_BASE_MSR, %ecx
rdmsr
test $LAPIC_BASE_MSR_BOOTSTRAP_PROCESSOR, %eax
jz ap_entry
mov $_ecar_stack, %esp
/* Align the stack and keep aligned for call to bootblock_c_entry() */
and $0xfffffff0, %esp
sub $8, %esp
movd %mm2, %eax
pushl %eax /* tsc[63:32] */
movd %mm1, %eax
pushl %eax /* tsc[31:0] */
post_code(0xa2)
call bootblock_c_entry
/* Never reached. */
stop:
post_code(POST_DEAD_CODE)
hlt
jmp stop
ap_entry:
/* Align the stack for call to ap_bootblock_c_entry() */
and $0xfffffff0, %esp
call ap_bootblock_c_entry
/* Never reached. */
jmp stop
_cache_as_ram_setup_end:
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