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xen/arm: Add helpers ioreadl/iowritel
Signed-off-by: Julien Grall <julien.grall@linaro.org> Acked-by: Ian Campbell <ian.campbell@citrix.com>
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Julien Grall authored and 
Ian Campbell committed
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@@ -0,0 +1,46 @@
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/*
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* Based on linux arch/arm/include/asm/io.h
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*
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* Copyright (C) 1996-2000 Russell King
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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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* Modifications:
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* 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
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* constant addresses and variable addresses.
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* 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
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* specific IO header files.
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* 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
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* 04-Apr-1999 PJB Added check_signature.
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* 12-Dec-1999 RMK More cleanups
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* 18-Jun-2000 RMK Removed virt_to_* and friends definitions
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* 05-Oct-2004 BJD Moved memory string functions to use void __iomem
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*/
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#ifndef _ARM_ARM32_IO_H
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#define _ARM_ARM32_IO_H
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#include <asm/system.h>
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static inline uint32_t ioreadl(const volatile void __iomem *addr)
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{
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uint32_t val;
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asm volatile("ldr %1, %0"
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: "+Qo" (*(volatile uint32_t __force *)addr),
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"=r" (val));
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dsb();
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return val;
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}
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static inline void iowritel(const volatile void __iomem *addr, uint32_t val)
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{
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dsb();
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asm volatile("str %1, %0"
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: "+Qo" (*(volatile uint32_t __force *)addr)
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: "r" (val));
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}
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#endif /* _ARM_ARM32_IO_H */
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@@ -0,0 +1,38 @@
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/*
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* Based on linux arch/arm64/include/asm/io.h
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*
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* Copyright (C) 1996-2000 Russell King
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* Copyright (C) 2012 ARM Ltd.
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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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#ifndef _ARM_ARM64_IO_H
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#define _ARM_ARM64_IO_H
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static inline uint32_t ioreadl(const volatile void __iomem *addr)
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{
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uint32_t val;
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asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr));
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dsb();
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return val;
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}
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static inline void iowritel(const volatile void __iomem *addr, uint32_t val)
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{
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dsb();
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asm volatile("str %w0, [%1]" : : "r" (val), "r" (addr));
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}
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#endif /* _ARM_ARM64_IO_H */
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@@ -6,6 +6,14 @@
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#include <asm/page.h>
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#include <public/xen.h>
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#if defined(CONFIG_ARM_32)
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# include <asm/arm32/io.h>
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#elif defined(CONFIG_ARM_64)
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# include <asm/arm64/io.h>
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#else
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# error "unknown ARM variant"
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#endif
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/* Align Xen to a 2 MiB boundary. */
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#define XEN_PADDR_ALIGN (1 << 21)
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