change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/arm/kernel/hyp-stub.S
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@@ -1,19 +1,6 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * Copyright (c) 2012 Linaro Limited.
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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 as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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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 along
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- * with this program; if not, write to the Free Software Foundation, Inc.,
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- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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  */
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 #include <linux/init.h>
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@@ -202,19 +189,19 @@
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 ENDPROC(__hyp_stub_install_secondary)
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 __hyp_stub_do_trap:
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+#ifdef ZIMAGE
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 	teq	r0, #HVC_SET_VECTORS
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 	bne	1f
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+	/* Only the ZIMAGE stubs can change the HYP vectors */
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 	mcr	p15, 4, r1, c12, c0, 0	@ set HVBAR
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 	b	__hyp_stub_exit
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+#endif
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 1:	teq	r0, #HVC_SOFT_RESTART
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-	bne	1f
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+	bne	2f
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 	bx	r1
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-1:	teq	r0, #HVC_RESET_VECTORS
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-	beq	__hyp_stub_exit
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-
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-	ldr	r0, =HVC_STUB_ERR
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+2:	ldr	r0, =HVC_STUB_ERR
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 	__ERET
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 __hyp_stub_exit:
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@@ -223,26 +210,9 @@
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 ENDPROC(__hyp_stub_do_trap)
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 /*
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- * __hyp_set_vectors: Call this after boot to set the initial hypervisor
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- * vectors as part of hypervisor installation.  On an SMP system, this should
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- * be called on each CPU.
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- *
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- * r0 must be the physical address of the new vector table (which must lie in
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- * the bottom 4GB of physical address space.
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- *
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- * r0 must be 32-byte aligned.
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- *
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- * Before calling this, you must check that the stub hypervisor is installed
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- * everywhere, by waiting for any secondary CPUs to be brought up and then
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- * checking that BOOT_CPU_MODE_HAVE_HYP(__boot_cpu_mode) is true.
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- *
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- * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or
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- * something else went wrong... in such cases, trying to install a new
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- * hypervisor is unlikely to work as desired.
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- *
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- * When you call into your shiny new hypervisor, sp_hyp will contain junk,
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- * so you will need to set that to something sensible at the new hypervisor's
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- * initialisation entry point.
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+ * __hyp_set_vectors is only used when ZIMAGE must bounce between HYP
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+ * and SVC. For the kernel itself, the vectors are set once and for
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+ * all by the stubs.
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  */
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 ENTRY(__hyp_set_vectors)
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 	mov	r1, r0
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@@ -257,12 +227,6 @@
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 	__HVC(0)
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 	ret	lr
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 ENDPROC(__hyp_soft_restart)
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-
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-ENTRY(__hyp_reset_vectors)
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-	mov	r0, #HVC_RESET_VECTORS
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-	__HVC(0)
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-	ret	lr
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-ENDPROC(__hyp_reset_vectors)
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 #ifndef ZIMAGE
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 .align 2