/*
- * U-boot - x86 Startup Code
+ * U-Boot - x86 Startup Code
*
* (C) Copyright 2008-2011
* Graeme Russ, <graeme.russ@gmail.com>
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <version.h>
#include <asm/global_data.h>
+#include <asm/post.h>
#include <asm/processor.h>
#include <asm/processor-flags.h>
#include <generated/generic-asm-offsets.h>
+#include <generated/asm-offsets.h>
.section .text
.code32
movl %eax, %cr0
wbinvd
+ /* Tell 32-bit code it is being entered from an in-RAM copy */
+ movw $GD_FLG_WARM_BOOT, %bx
+ jmp 1f
_start:
- /* This is the 32-bit cold-reset entry point */
+ /*
+ * This is the 32-bit cold-reset entry point. Initialize %bx to 0
+ * in case we're preceeded by some sort of boot stub.
+ */
+ movw $GD_FLG_COLD_BOOT, %bx
+1:
+ /* Save BIST */
+ movl %eax, %ebp
/* Load the segement registes to match the gdt loaded in start16.S */
movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax
jmp early_board_init
.globl early_board_init_ret
early_board_init_ret:
+ post_code(POST_START)
/* Initialise Cache-As-RAM */
jmp car_init
.globl car_init_ret
car_init_ret:
+#ifndef CONFIG_HAVE_FSP
/*
* We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM,
* or fully initialised SDRAM - we really don't care which)
* starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack
+ * and early malloc area. The MRC requires some space at the top.
+ *
+ * Stack grows down from top of CAR. We have:
+ *
+ * top-> CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE
+ * MRC area
+ * global_data
+ * x86 global descriptor table
+ * early malloc area
+ * stack
+ * bottom-> CONFIG_SYS_CAR_ADDR
*/
-
- /* Stack grows down from top of CAR */
- movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE), %esp
+ movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %esp
+#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
+ subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp
+#endif
+#else
+ /*
+ * When we get here after car_init, esp points to a temporary stack
+ * and esi holds the HOB list address returned by the FSP.
+ */
+#endif
/* Reserve space on stack for global data */
subl $GENERATED_GBL_DATA_SIZE, %esp
/* Align global data to 16-byte boundary */
andl $0xfffffff0, %esp
+ post_code(POST_START_STACK)
- /* Setup first parameter to setup_gdt */
+ /* Zero the global data since it won't happen later */
+ xorl %eax, %eax
+ movl $GENERATED_GBL_DATA_SIZE, %ecx
+ movl %esp, %edi
+ rep stosb
+
+#ifdef CONFIG_HAVE_FSP
+ /* Store HOB list */
+ movl %esp, %edx
+ addl $GD_HOB_LIST, %edx
+ movl %esi, (%edx)
+#endif
+
+ /* Setup first parameter to setup_gdt, pointer to global_data */
movl %esp, %eax
/* Reserve space for global descriptor table */
/* Align temporary global descriptor table to 16-byte boundary */
andl $0xfffffff0, %esp
+ movl %esp, %ecx
+
+#if defined(CONFIG_SYS_MALLOC_F_LEN)
+ subl $CONFIG_SYS_MALLOC_F_LEN, %esp
+ movl %eax, %edx
+ addl $GD_MALLOC_BASE, %edx
+ movl %esp, (%edx)
+#endif
+ /* Store BIST */
+ movl %eax, %edx
+ addl $GD_BIST, %edx
+ movl %ebp, (%edx)
/* Set second parameter to setup_gdt */
- movl %esp, %edx
-
- /* gd->gd_addr = gd (Required to allow gd->xyz to work) */
- movl %eax, (%eax)
+ movl %ecx, %edx
/* Setup global descriptor table so gd->xyz works */
call setup_gdt
/* Set parameter to board_init_f() to boot flags */
+ post_code(POST_START_DONE)
xorl %eax, %eax
- movw %bx, %ax
/* Enter, U-boot! */
call board_init_f
/* Set second parameter to setup_gdt */
movl %esp, %edx
- /* gd->gd_addr = gd (Required to allow gd->xyz to work) */
- movl %eax, (%eax)
-
/* Setup global descriptor table so gd->xyz works */
call setup_gdt
+ /* Set if we need to disable CAR */
+.weak car_uninit
+ movl $car_uninit, %eax
+ cmpl $0, %eax
+ jz 1f
+
+ call car_uninit
+1:
/* Re-enter U-Boot by calling board_init_f_r */
call board_init_f_r