mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 10:18:38 +00:00
544293f878
This slimbootloader CPU type is to enable U-Boot as a payload which runs on top of Slim Bootloader (https://github.com/slimbootloader). The Slim Bootloader is designed with multi-stage architecture for the execution from reset vector to OS booting, and supports QEMU, Apollolake, Whiskeylake and Coffeelake platforms consuming Intel FSP (https://github.com/IntelFsp) for silicon initialization including CAR and memory initialization. The Slim Bootloader generates new HOB (Hand Off Block) which are serial port info, memory map info, performance data info and so on, and passes it to a Payload. U-Boot as a payload will use these HOB information for basic initialization such as serial console. As an initial commit, - Add CONFIG_SYS_SLIMBOOTLOADER to enable slimbootloader CPU type - Add new arch/x86/cpu/slimbootloader directory with minimum codes - Get hob_list pointer from Slim Bootloader Signed-off-by: Aiden Park <aiden.park@intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
308 lines
7.2 KiB
ArmAsm
308 lines
7.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* U-Boot - x86 Startup Code
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*
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* (C) Copyright 2008-2011
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* Graeme Russ, <graeme.russ@gmail.com>
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*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*/
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#include <config.h>
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#include <asm/global_data.h>
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#include <asm/post.h>
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#include <asm/processor.h>
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#include <asm/processor-flags.h>
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#include <generated/generic-asm-offsets.h>
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#include <generated/asm-offsets.h>
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#include <linux/linkage.h>
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.section .text.start
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.code32
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.globl _start
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.type _start, @function
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.globl _x86boot_start
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_x86boot_start:
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/*
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* This is the fail-safe 32-bit bootstrap entry point.
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*
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* This code is used when booting from another boot loader like
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* coreboot or EFI. So we repeat some of the same init found in
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* start16.
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*/
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cli
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cld
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/* Turn off cache (this might require a 486-class CPU) */
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movl %cr0, %eax
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orl $(X86_CR0_NW | X86_CR0_CD), %eax
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movl %eax, %cr0
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wbinvd
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/* Tell 32-bit code it is being entered from an in-RAM copy */
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movl $GD_FLG_WARM_BOOT, %ebx
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/*
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* Zero the BIST (Built-In Self Test) value since we don't have it.
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* It must be 0 or the previous loader would have reported an error.
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*/
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movl $0, %ebp
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jmp 1f
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/* Add a way for tools to discover the _start entry point */
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.align 4
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.long 0x12345678
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_start:
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/*
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* This is the 32-bit cold-reset entry point, coming from start16.
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* Set %ebx to GD_FLG_COLD_BOOT to indicate this.
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*/
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movl $GD_FLG_COLD_BOOT, %ebx
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/* Save BIST */
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movl %eax, %ebp
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1:
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/* Save table pointer */
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movl %ecx, %esi
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#ifdef CONFIG_X86_LOAD_FROM_32_BIT
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lgdt gdt_ptr2
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#endif
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/* Load the segement registers to match the GDT loaded in start16.S */
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movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax
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movw %ax, %fs
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movw %ax, %ds
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movw %ax, %gs
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movw %ax, %es
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movw %ax, %ss
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/* Clear the interrupt vectors */
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lidt blank_idt_ptr
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/*
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* Critical early platform init - generally not used, we prefer init
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* to happen later when we have a console, in case something goes
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* wrong.
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*/
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jmp early_board_init
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.globl early_board_init_ret
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early_board_init_ret:
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post_code(POST_START)
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/* Initialise Cache-As-RAM */
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jmp car_init
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.globl car_init_ret
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car_init_ret:
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#ifndef CONFIG_USE_HOB
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/*
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* We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM,
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* or fully initialised SDRAM - we really don't care which)
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* starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack
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* and early malloc() area. The MRC requires some space at the top.
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*
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* Stack grows down from top of CAR. We have:
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*
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* top-> CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE
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* MRC area
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* global_data with x86 global descriptor table
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* early malloc area
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* stack
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* bottom-> CONFIG_SYS_CAR_ADDR
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*/
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movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %esp
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#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
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subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp
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#endif
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#else
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/*
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* U-Boot enters here twice. For the first time it comes from
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* car_init_done() with esp points to a temporary stack and esi
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* set to zero. For the second time it comes from fsp_init_done()
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* with esi holding the HOB list address returned by the FSP.
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*/
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#endif
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/* Set up global data */
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mov %esp, %eax
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call board_init_f_alloc_reserve
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mov %eax, %esp
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call board_init_f_init_reserve
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#ifdef CONFIG_DEBUG_UART
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call debug_uart_init
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#endif
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/* Get address of global_data */
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mov %fs:0, %edx
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#ifdef CONFIG_USE_HOB
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/* Store the HOB list if we have one */
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test %esi, %esi
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jz skip_hob
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movl %esi, GD_HOB_LIST(%edx)
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#ifdef CONFIG_HAVE_FSP
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/*
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* After fsp_init() returns, the stack has already been switched to a
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* place within system memory as defined by CONFIG_FSP_TEMP_RAM_ADDR.
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* Enlarge the size of malloc() pool before relocation since we have
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* plenty of memory now.
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*/
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subl $CONFIG_FSP_SYS_MALLOC_F_LEN, %esp
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movl %esp, GD_MALLOC_BASE(%edx)
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#endif
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skip_hob:
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#else
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/* Store table pointer */
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movl %esi, GD_TABLE(%edx)
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#endif
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/* Store BIST */
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movl %ebp, GD_BIST(%edx)
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/* Set parameter to board_init_f() to boot flags */
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post_code(POST_START_DONE)
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xorl %eax, %eax
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/* Enter, U-Boot! */
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call board_init_f
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/* indicate (lack of) progress */
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movw $0x85, %ax
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jmp die
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.globl board_init_f_r_trampoline
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.type board_init_f_r_trampoline, @function
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board_init_f_r_trampoline:
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/*
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* SDRAM has been initialised, U-Boot code has been copied into
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* RAM, BSS has been cleared and relocation adjustments have been
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* made. It is now time to jump into the in-RAM copy of U-Boot
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*
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* %eax = Address of top of new stack
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*/
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/* Stack grows down from top of SDRAM */
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movl %eax, %esp
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/* See if we need to disable CAR */
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call car_uninit
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/* Re-enter U-Boot by calling board_init_f_r() */
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call board_init_f_r
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#ifdef CONFIG_TPL
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.globl jump_to_spl
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.type jump_to_spl, @function
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jump_to_spl:
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/* Reset stack to the top of CAR space */
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movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %esp
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#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
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subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp
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#endif
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jmp *%eax
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#endif
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die:
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hlt
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jmp die
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hlt
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WEAK(car_uninit)
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ret
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ENDPROC(car_uninit)
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blank_idt_ptr:
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.word 0 /* limit */
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.long 0 /* base */
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.p2align 2 /* force 4-byte alignment */
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/* Add a multiboot header so U-Boot can be loaded by GRUB2 */
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multiboot_header:
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/* magic */
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.long 0x1badb002
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/* flags */
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.long (1 << 16)
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/* checksum */
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.long -0x1BADB002 - (1 << 16)
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/* header addr */
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.long multiboot_header - _x86boot_start + CONFIG_SYS_TEXT_BASE
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/* load addr */
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.long CONFIG_SYS_TEXT_BASE
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/* load end addr */
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.long 0
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/* bss end addr */
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.long 0
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/* entry addr */
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.long CONFIG_SYS_TEXT_BASE
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#ifdef CONFIG_X86_LOAD_FROM_32_BIT
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/*
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* The following Global Descriptor Table is just enough to get us into
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* 'Flat Protected Mode' - It will be discarded as soon as the final
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* GDT is setup in a safe location in RAM
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*/
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gdt_ptr2:
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.word 0x1f /* limit (31 bytes = 4 GDT entries - 1) */
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.long gdt_rom2 /* base */
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/* Some CPUs are picky about GDT alignment... */
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.align 16
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.globl gdt_rom2
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gdt_rom2:
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/*
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* The GDT table ...
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*
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* Selector Type
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* 0x00 NULL
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* 0x08 Unused
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* 0x10 32bit code
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* 0x18 32bit data/stack
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*/
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/* The NULL Desciptor - Mandatory */
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.word 0x0000 /* limit_low */
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.word 0x0000 /* base_low */
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.byte 0x00 /* base_middle */
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.byte 0x00 /* access */
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.byte 0x00 /* flags + limit_high */
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.byte 0x00 /* base_high */
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/* Unused Desciptor - (matches Linux) */
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.word 0x0000 /* limit_low */
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.word 0x0000 /* base_low */
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.byte 0x00 /* base_middle */
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.byte 0x00 /* access */
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.byte 0x00 /* flags + limit_high */
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.byte 0x00 /* base_high */
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/*
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* The Code Segment Descriptor:
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* - Base = 0x00000000
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* - Size = 4GB
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* - Access = Present, Ring 0, Exec (Code), Readable
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* - Flags = 4kB Granularity, 32-bit
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*/
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.word 0xffff /* limit_low */
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.word 0x0000 /* base_low */
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.byte 0x00 /* base_middle */
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.byte 0x9b /* access */
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.byte 0xcf /* flags + limit_high */
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.byte 0x00 /* base_high */
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/*
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* The Data Segment Descriptor:
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* - Base = 0x00000000
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* - Size = 4GB
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* - Access = Present, Ring 0, Non-Exec (Data), Writable
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* - Flags = 4kB Granularity, 32-bit
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*/
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.word 0xffff /* limit_low */
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.word 0x0000 /* base_low */
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.byte 0x00 /* base_middle */
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.byte 0x93 /* access */
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.byte 0xcf /* flags + limit_high */
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.byte 0x00 /* base_high */
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#endif
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