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arm: Get bloblist from boot arguments

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Add arch custom function to get bloblist from boot arguments.
Check whether boot arguments aligns with the register conventions
defined in FW Handoff spec v0.9.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
This commit is contained in:
Raymond Mao 2024-02-03 08:36:25 -08:00 committed by Tom Rini
parent 11f3171256
commit fc61de3ff6
3 changed files with 46 additions and 0 deletions
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2
arch/arm/lib/Makefile
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@ -85,6 +85,8 @@ obj-y += psci-dt.o
obj-$(CONFIG_DEBUG_LL) += debug.o
obj-$(CONFIG_BLOBLIST) += xferlist.o
# For EABI conformant tool chains, provide eabi_compat()
ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
extra-y += eabi_compat.o

25
arch/arm/lib/xferlist.c Normal file
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@ -0,0 +1,25 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2023 Linaro Limited
* Author: Raymond Mao <raymond.mao@linaro.org>
*/
#include <linux/types.h>
#include <errno.h>
#include <bloblist.h>
#include "xferlist.h"
int xferlist_from_boot_arg(ulong addr, ulong size)
{
int ret;
ret = bloblist_check(saved_args[3], size);
if (ret)
return ret;
ret = bloblist_check_reg_conv(saved_args[0], saved_args[2],
saved_args[1]);
if (ret)
return ret;
return bloblist_reloc((void *)addr, size);
}

19
arch/arm/lib/xferlist.h Normal file
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@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause */
/*
* Copyright (C) 2023 Linaro Limited
* Author: Raymond Mao <raymond.mao@linaro.org>
*/
#ifndef _XFERLIST_H_
#define _XFERLIST_H_
/*
* Boot parameters saved from start.S
* saved_args[0]: FDT base address
* saved_args[1]: Bloblist signature
* saved_args[2]: must be 0
* saved_args[3]: Bloblist base address
*/
extern unsigned long saved_args[];
#endif /* _XFERLIST_H_ */