X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Fx86%2Fcpu%2Fstart.S;h=00e585e19bfccdd4e0465c9575b98d137fc811b4;hb=605e15db2b54302364a2528d3c6604fbc57be846;hp=ee0dabe4bcd049becb3c632ec408c98f32d13fb3;hpb=e390e8709149664ff96cf19384264c84573f3082;p=oweals%2Fu-boot.git diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index ee0dabe4bc..00e585e19b 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -1,5 +1,5 @@ /* - * U-boot - x86 Startup Code + * U-Boot - x86 Startup Code * * (C) Copyright 2008-2011 * Graeme Russ, @@ -7,31 +7,16 @@ * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, * - * 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 -#include #include +#include #include #include #include +#include .section .text .code32 @@ -55,8 +40,18 @@ _x86boot_start: 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 @@ -73,27 +68,94 @@ _start: 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 + */ + 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. */ - movl $CONFIG_SYS_INIT_SP_ADDR, %esp +#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) + + /* 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 + test %esi, %esi + jz skip_hob + + /* Store HOB list */ + movl %esp, %edx + addl $GD_HOB_LIST, %edx + movl %esi, (%edx) + +skip_hob: +#endif + /* Setup first parameter to setup_gdt, pointer to global_data */ + movl %esp, %eax - /* Initialise the Global Data Pointer */ - movl $CONFIG_SYS_INIT_GD_ADDR, %eax + /* Reserve space for global descriptor table */ + subl $X86_GDT_SIZE, %esp + + /* 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 $GENERATED_GBL_DATA_SIZE, %edx - call init_gd; + 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 %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 @@ -113,9 +175,47 @@ board_init_f_r_trampoline: * %eax = Address of top of new stack */ - /* Setup stack in RAM */ + /* Stack grows down from top of SDRAM */ movl %eax, %esp + /* Reserve space on stack for global data */ + subl $GENERATED_GBL_DATA_SIZE, %esp + + /* Align global data to 16-byte boundary */ + andl $0xfffffff0, %esp + + /* Setup first parameter to memcpy (and setup_gdt) */ + movl %esp, %eax + + /* Setup second parameter to memcpy */ + fs movl 0, %edx + + /* Set third parameter to memcpy */ + movl $GENERATED_GBL_DATA_SIZE, %ecx + + /* Copy global data from CAR to SDRAM stack */ + call memcpy + + /* Reserve space for global descriptor table */ + subl $X86_GDT_SIZE, %esp + + /* Align global descriptor table to 16-byte boundary */ + andl $0xfffffff0, %esp + + /* Set second parameter to setup_gdt */ + movl %esp, %edx + + /* 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