linux/arch/arm/mach-omap2/omap-secure.c
Russell King 716a3dc200 ARM: Add arm_memblock_steal() to allocate memory away from the kernel
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>
2012-01-13 15:02:35 +00:00

73 lines
1.6 KiB
C

/*
* OMAP Secure API infrastructure.
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Santosh Shilimkar <santosh.shilimkar@ti.com>
*
*
* This program is free software,you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <asm/cacheflush.h>
#include <asm/memblock.h>
#include <mach/omap-secure.h>
static phys_addr_t omap_secure_memblock_base;
/**
* omap_sec_dispatcher: Routine to dispatch low power secure
* service routines
* @idx: The HAL API index
* @flag: The flag indicating criticality of operation
* @nargs: Number of valid arguments out of four.
* @arg1, arg2, arg3 args4: Parameters passed to secure API
*
* Return the non-zero error value on failure.
*/
u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
u32 arg3, u32 arg4)
{
u32 ret;
u32 param[5];
param[0] = nargs;
param[1] = arg1;
param[2] = arg2;
param[3] = arg3;
param[4] = arg4;
/*
* Secure API needs physical address
* pointer for the parameters
*/
flush_cache_all();
outer_clean_range(__pa(param), __pa(param + 5));
ret = omap_smc2(idx, flag, __pa(param));
return ret;
}
/* Allocate the memory to save secure ram */
int __init omap_secure_ram_reserve_memblock(void)
{
u32 size = OMAP_SECURE_RAM_STORAGE;
size = ALIGN(size, SZ_1M);
omap_secure_memblock_base = arm_memblock_steal(size, SZ_1M);
return 0;
}
phys_addr_t omap_secure_ram_mempool_base(void)
{
return omap_secure_memblock_base;
}