mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-10 06:43:28 +09:00
![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
459 lines
10 KiB
C
459 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* Copyright (C) 2011
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* Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
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* - Added prep subcommand support
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* - Reorganized source - modeled after powerpc version
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <dm/root.h>
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#include <image.h>
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#include <u-boot/zlib.h>
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#include <asm/byteorder.h>
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#include <linux/libfdt.h>
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#include <mapmem.h>
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#include <fdt_support.h>
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#include <asm/bootm.h>
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#include <asm/secure.h>
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#include <linux/compiler.h>
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#include <bootm.h>
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#include <vxworks.h>
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#ifdef CONFIG_ARMV7_NONSEC
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#include <asm/armv7.h>
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#endif
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#include <asm/setup.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct tag *params;
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static ulong get_sp(void)
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{
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ulong ret;
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asm("mov %0, sp" : "=r"(ret) : );
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return ret;
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}
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void arch_lmb_reserve(struct lmb *lmb)
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{
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ulong sp, bank_end;
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int bank;
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/*
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* Booting a (Linux) kernel image
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*
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* Allocate space for command line and board info - the
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* address should be as high as possible within the reach of
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* the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
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* memory, which means far enough below the current stack
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* pointer.
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*/
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sp = get_sp();
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debug("## Current stack ends at 0x%08lx ", sp);
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/* adjust sp by 4K to be safe */
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sp -= 4096;
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for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
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if (sp < gd->bd->bi_dram[bank].start)
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continue;
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bank_end = gd->bd->bi_dram[bank].start +
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gd->bd->bi_dram[bank].size;
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if (sp >= bank_end)
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continue;
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lmb_reserve(lmb, sp, bank_end - sp);
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break;
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}
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}
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__weak void board_quiesce_devices(void)
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{
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}
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/**
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* announce_and_cleanup() - Print message and prepare for kernel boot
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*
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* @fake: non-zero to do everything except actually boot
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*/
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static void announce_and_cleanup(int fake)
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{
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printf("\nStarting kernel ...%s\n\n", fake ?
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"(fake run for tracing)" : "");
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bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
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#ifdef CONFIG_BOOTSTAGE_FDT
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bootstage_fdt_add_report();
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#endif
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#ifdef CONFIG_BOOTSTAGE_REPORT
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bootstage_report();
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#endif
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#ifdef CONFIG_USB_DEVICE
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udc_disconnect();
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#endif
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board_quiesce_devices();
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/*
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* Call remove function of all devices with a removal flag set.
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* This may be useful for last-stage operations, like cancelling
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* of DMA operation or releasing device internal buffers.
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*/
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dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
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cleanup_before_linux();
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}
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static void setup_start_tag (bd_t *bd)
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{
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params = (struct tag *)bd->bi_boot_params;
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params->hdr.tag = ATAG_CORE;
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params->hdr.size = tag_size (tag_core);
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params->u.core.flags = 0;
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params->u.core.pagesize = 0;
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params->u.core.rootdev = 0;
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params = tag_next (params);
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}
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static void setup_memory_tags(bd_t *bd)
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{
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int i;
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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params->hdr.tag = ATAG_MEM;
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params->hdr.size = tag_size (tag_mem32);
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params->u.mem.start = bd->bi_dram[i].start;
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params->u.mem.size = bd->bi_dram[i].size;
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params = tag_next (params);
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}
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}
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static void setup_commandline_tag(bd_t *bd, char *commandline)
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{
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char *p;
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if (!commandline)
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return;
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/* eat leading white space */
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for (p = commandline; *p == ' '; p++);
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/* skip non-existent command lines so the kernel will still
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* use its default command line.
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*/
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if (*p == '\0')
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return;
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params->hdr.tag = ATAG_CMDLINE;
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params->hdr.size =
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(sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
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strcpy (params->u.cmdline.cmdline, p);
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params = tag_next (params);
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}
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static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
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{
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/* an ATAG_INITRD node tells the kernel where the compressed
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* ramdisk can be found. ATAG_RDIMG is a better name, actually.
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*/
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params->hdr.tag = ATAG_INITRD2;
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params->hdr.size = tag_size (tag_initrd);
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params->u.initrd.start = initrd_start;
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params->u.initrd.size = initrd_end - initrd_start;
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params = tag_next (params);
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}
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static void setup_serial_tag(struct tag **tmp)
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{
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struct tag *params = *tmp;
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struct tag_serialnr serialnr;
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get_board_serial(&serialnr);
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params->hdr.tag = ATAG_SERIAL;
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params->hdr.size = tag_size (tag_serialnr);
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params->u.serialnr.low = serialnr.low;
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params->u.serialnr.high= serialnr.high;
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params = tag_next (params);
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*tmp = params;
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}
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static void setup_revision_tag(struct tag **in_params)
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{
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u32 rev = 0;
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rev = get_board_rev();
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params->hdr.tag = ATAG_REVISION;
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params->hdr.size = tag_size (tag_revision);
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params->u.revision.rev = rev;
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params = tag_next (params);
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}
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static void setup_end_tag(bd_t *bd)
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{
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params->hdr.tag = ATAG_NONE;
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params->hdr.size = 0;
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}
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__weak void setup_board_tags(struct tag **in_params) {}
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#ifdef CONFIG_ARM64
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static void do_nonsec_virt_switch(void)
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{
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smp_kick_all_cpus();
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dcache_disable(); /* flush cache before swtiching to EL2 */
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}
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#endif
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/* Subcommand: PREP */
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static void boot_prep_linux(bootm_headers_t *images)
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{
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char *commandline = env_get("bootargs");
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
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#ifdef CONFIG_OF_LIBFDT
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debug("using: FDT\n");
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if (image_setup_linux(images)) {
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printf("FDT creation failed! hanging...");
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hang();
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}
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#endif
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} else if (BOOTM_ENABLE_TAGS) {
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debug("using: ATAGS\n");
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setup_start_tag(gd->bd);
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if (BOOTM_ENABLE_SERIAL_TAG)
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setup_serial_tag(¶ms);
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if (BOOTM_ENABLE_CMDLINE_TAG)
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setup_commandline_tag(gd->bd, commandline);
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if (BOOTM_ENABLE_REVISION_TAG)
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setup_revision_tag(¶ms);
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if (BOOTM_ENABLE_MEMORY_TAGS)
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setup_memory_tags(gd->bd);
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if (BOOTM_ENABLE_INITRD_TAG) {
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/*
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* In boot_ramdisk_high(), it may relocate ramdisk to
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* a specified location. And set images->initrd_start &
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* images->initrd_end to relocated ramdisk's start/end
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* addresses. So use them instead of images->rd_start &
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* images->rd_end when possible.
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*/
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if (images->initrd_start && images->initrd_end) {
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setup_initrd_tag(gd->bd, images->initrd_start,
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images->initrd_end);
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} else if (images->rd_start && images->rd_end) {
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setup_initrd_tag(gd->bd, images->rd_start,
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images->rd_end);
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}
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}
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setup_board_tags(¶ms);
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setup_end_tag(gd->bd);
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} else {
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printf("FDT and ATAGS support not compiled in - hanging\n");
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hang();
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}
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}
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__weak bool armv7_boot_nonsec_default(void)
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{
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#ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
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return false;
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#else
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return true;
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#endif
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}
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#ifdef CONFIG_ARMV7_NONSEC
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bool armv7_boot_nonsec(void)
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{
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char *s = env_get("bootm_boot_mode");
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bool nonsec = armv7_boot_nonsec_default();
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if (s && !strcmp(s, "sec"))
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nonsec = false;
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if (s && !strcmp(s, "nonsec"))
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nonsec = true;
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return nonsec;
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}
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#endif
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#ifdef CONFIG_ARM64
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__weak void update_os_arch_secondary_cores(uint8_t os_arch)
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{
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}
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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static void switch_to_el1(void)
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{
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if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
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(images.os.arch == IH_ARCH_ARM))
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armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
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(u64)images.ft_addr, 0,
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(u64)images.ep,
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ES_TO_AARCH32);
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else
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armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
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images.ep,
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ES_TO_AARCH64);
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}
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#endif
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#endif
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/* Subcommand: GO */
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static void boot_jump_linux(bootm_headers_t *images, int flag)
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{
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#ifdef CONFIG_ARM64
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void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
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void *res2);
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int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
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kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
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void *res2))images->ep;
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debug("## Transferring control to Linux (at address %lx)...\n",
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(ulong) kernel_entry);
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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announce_and_cleanup(fake);
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if (!fake) {
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#ifdef CONFIG_ARMV8_PSCI
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armv8_setup_psci();
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#endif
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do_nonsec_virt_switch();
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update_os_arch_secondary_cores(images->os.arch);
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
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(u64)switch_to_el1, ES_TO_AARCH64);
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#else
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if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
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(images->os.arch == IH_ARCH_ARM))
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armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
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(u64)images->ft_addr, 0,
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(u64)images->ep,
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ES_TO_AARCH32);
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else
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armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
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images->ep,
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ES_TO_AARCH64);
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#endif
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}
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#else
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unsigned long machid = gd->bd->bi_arch_number;
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char *s;
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void (*kernel_entry)(int zero, int arch, uint params);
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unsigned long r2;
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int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
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kernel_entry = (void (*)(int, int, uint))images->ep;
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#ifdef CONFIG_CPU_V7M
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ulong addr = (ulong)kernel_entry | 1;
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kernel_entry = (void *)addr;
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#endif
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s = env_get("machid");
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if (s) {
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if (strict_strtoul(s, 16, &machid) < 0) {
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debug("strict_strtoul failed!\n");
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return;
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}
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printf("Using machid 0x%lx from environment\n", machid);
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}
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debug("## Transferring control to Linux (at address %08lx)" \
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"...\n", (ulong) kernel_entry);
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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announce_and_cleanup(fake);
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
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r2 = (unsigned long)images->ft_addr;
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else
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r2 = gd->bd->bi_boot_params;
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if (!fake) {
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#ifdef CONFIG_ARMV7_NONSEC
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if (armv7_boot_nonsec()) {
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armv7_init_nonsec();
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secure_ram_addr(_do_nonsec_entry)(kernel_entry,
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0, machid, r2);
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} else
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#endif
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kernel_entry(0, machid, r2);
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}
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#endif
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}
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/* Main Entry point for arm bootm implementation
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*
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* Modeled after the powerpc implementation
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* DIFFERENCE: Instead of calling prep and go at the end
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* they are called if subcommand is equal 0.
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*/
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int do_bootm_linux(int flag, int argc, char * const argv[],
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bootm_headers_t *images)
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{
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/* No need for those on ARM */
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if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
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return -1;
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if (flag & BOOTM_STATE_OS_PREP) {
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boot_prep_linux(images);
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return 0;
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}
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if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
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boot_jump_linux(images, flag);
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return 0;
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}
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boot_prep_linux(images);
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boot_jump_linux(images, flag);
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return 0;
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}
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#if defined(CONFIG_BOOTM_VXWORKS)
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void boot_prep_vxworks(bootm_headers_t *images)
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{
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#if defined(CONFIG_OF_LIBFDT)
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int off;
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if (images->ft_addr) {
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off = fdt_path_offset(images->ft_addr, "/memory");
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if (off < 0) {
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if (arch_fixup_fdt(images->ft_addr))
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puts("## WARNING: fixup memory failed!\n");
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}
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}
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#endif
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cleanup_before_linux();
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}
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void boot_jump_vxworks(bootm_headers_t *images)
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{
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#if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
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armv8_setup_psci();
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smp_kick_all_cpus();
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#endif
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/* ARM VxWorks requires device tree physical address to be passed */
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((void (*)(void *))images->ep)(images->ft_addr);
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}
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#endif
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