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https://github.com/AsahiLinux/u-boot
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97a8196451
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>
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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* Copyright (C) 2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <common.h>
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#include <stdio_dev.h>
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#include <linux/ctype.h>
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#include <linux/types.h>
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#include <asm/global_data.h>
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#include <libfdt.h>
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#include <fdt_support.h>
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#include <asm/armv7.h>
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#include <asm/psci.h>
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static int fdt_psci(void *fdt)
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{
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#ifdef CONFIG_ARMV7_PSCI
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int nodeoff;
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int tmp;
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nodeoff = fdt_path_offset(fdt, "/cpus");
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if (nodeoff < 0) {
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printf("couldn't find /cpus\n");
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return nodeoff;
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}
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/* add 'enable-method = "psci"' to each cpu node */
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for (tmp = fdt_first_subnode(fdt, nodeoff);
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tmp >= 0;
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tmp = fdt_next_subnode(fdt, tmp)) {
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const struct fdt_property *prop;
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int len;
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prop = fdt_get_property(fdt, tmp, "device_type", &len);
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if (!prop)
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continue;
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if (len < 4)
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continue;
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if (strcmp(prop->data, "cpu"))
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continue;
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fdt_setprop_string(fdt, tmp, "enable-method", "psci");
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}
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nodeoff = fdt_path_offset(fdt, "/psci");
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if (nodeoff < 0) {
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nodeoff = fdt_path_offset(fdt, "/");
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if (nodeoff < 0)
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return nodeoff;
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nodeoff = fdt_add_subnode(fdt, nodeoff, "psci");
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if (nodeoff < 0)
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return nodeoff;
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}
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tmp = fdt_setprop_string(fdt, nodeoff, "compatible", "arm,psci");
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if (tmp)
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return tmp;
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tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", ARM_PSCI_FN_CPU_SUSPEND);
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", ARM_PSCI_FN_CPU_OFF);
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", ARM_PSCI_FN_CPU_ON);
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if (tmp)
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return tmp;
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tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", ARM_PSCI_FN_MIGRATE);
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if (tmp)
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return tmp;
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#endif
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return 0;
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}
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int armv7_update_dt(void *fdt)
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{
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if (!armv7_boot_nonsec())
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return 0;
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#ifndef CONFIG_ARMV7_SECURE_BASE
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/* secure code lives in RAM, keep it alive */
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fdt_add_mem_rsv(fdt, (unsigned long)__secure_start,
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__secure_end - __secure_start);
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#endif
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return fdt_psci(fdt);
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}
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