716a3dc200
Several platforms are now using the memblock_alloc+memblock_free+
memblock_remove trick to obtain memory which won't be mapped in the
kernel's page tables. Most platforms do this (correctly) in the
->reserve callback. However, OMAP has started to call these functions
outside of this callback, and this is extremely unsafe - memory will
not be unmapped, and could well be given out after memblock is no
longer responsible for its management.
So, provide arm_memblock_steal() to perform this function, and ensure
that it panic()s if it is used inappropriately. Convert everyone
over, including OMAP.
As a result, OMAP with OMAP4_ERRATA_I688 enabled will panic on boot
with this change. Mark this option as BROKEN and make it depend on
BROKEN. OMAP needs to be fixed, or 137d105d50 (ARM: OMAP4: Fix
errata i688 with MPU interconnect barriers.) reverted until such
time it can be fixed correctly.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* OMAP Secure API infrastructure.
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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*
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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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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/memblock.h>
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#include <asm/cacheflush.h>
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#include <asm/memblock.h>
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#include <mach/omap-secure.h>
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static phys_addr_t omap_secure_memblock_base;
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/**
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* omap_sec_dispatcher: Routine to dispatch low power secure
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* service routines
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* @idx: The HAL API index
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* @flag: The flag indicating criticality of operation
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* @nargs: Number of valid arguments out of four.
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* @arg1, arg2, arg3 args4: Parameters passed to secure API
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*
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* Return the non-zero error value on failure.
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*/
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u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
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u32 arg3, u32 arg4)
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{
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u32 ret;
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u32 param[5];
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param[0] = nargs;
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param[1] = arg1;
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param[2] = arg2;
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param[3] = arg3;
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param[4] = arg4;
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/*
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* Secure API needs physical address
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* pointer for the parameters
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*/
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flush_cache_all();
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outer_clean_range(__pa(param), __pa(param + 5));
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ret = omap_smc2(idx, flag, __pa(param));
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return ret;
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}
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/* Allocate the memory to save secure ram */
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int __init omap_secure_ram_reserve_memblock(void)
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{
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u32 size = OMAP_SECURE_RAM_STORAGE;
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size = ALIGN(size, SZ_1M);
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omap_secure_memblock_base = arm_memblock_steal(size, SZ_1M);
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return 0;
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}
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phys_addr_t omap_secure_ram_mempool_base(void)
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{
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return omap_secure_memblock_base;
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}
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