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![Ian Campbell](/assets/img/avatar_default.png)
Commit 8bc347e2ec
"ARM: bootm: Allow booting in secure mode on hyp capable
systems" added the capability to select nonsec vs sec mode boot via an
environment var.
There is a subtle gotcha with this functionality, which is that the PSCI nodes
are still created in the fdt (via armv7_update_dt->fdt_psci) even when booting
in secure mode. Which means that if the kernel is PSCI aware then it will fail
to boot because it will try and do PSCI from secure world, which won't work.
This likely didn't get noticed before because the original purpose was to
support booting the legacy linux-sunxi kernels which don't understand PSCI.
To fix expose boot_nonsec (renaming with armv7_ prefix) outside of bootm.c and
use from the virt-dt code.
As well as avoiding the creation of the PSCI nodes we should also avoid
reserving the secure RAM, so do so.
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
401 lines
8.9 KiB
C
401 lines
8.9 KiB
C
/* 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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.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 <libfdt.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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#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
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#include <asm/armv7.h>
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#endif
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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;
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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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lmb_reserve(lmb, sp,
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gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
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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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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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flush_dcache_all(); /* flush cache before swtiching to EL2 */
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armv8_switch_to_el2();
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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armv8_switch_to_el1();
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#endif
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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 = getenv("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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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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#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
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bool armv7_boot_nonsec(void)
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{
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char *s = getenv("bootm_boot_mode");
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#ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
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bool nonsec = false;
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#else
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bool nonsec = true;
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#endif
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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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/* 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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do_nonsec_virt_switch();
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kernel_entry(images->ft_addr, NULL, NULL, NULL);
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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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s = getenv("machid");
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if (s) {
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strict_strtoul(s, 16, &machid);
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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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#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
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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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#ifdef CONFIG_CMD_BOOTZ
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struct zimage_header {
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uint32_t code[9];
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uint32_t zi_magic;
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uint32_t zi_start;
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uint32_t zi_end;
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};
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#define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818
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int bootz_setup(ulong image, ulong *start, ulong *end)
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{
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struct zimage_header *zi;
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zi = (struct zimage_header *)map_sysmem(image, 0);
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if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
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puts("Bad Linux ARM zImage magic!\n");
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return 1;
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}
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*start = zi->zi_start;
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*end = zi->zi_end;
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printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
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*end);
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return 0;
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}
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#endif /* CONFIG_CMD_BOOTZ */
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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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/* 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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