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/*
* arch/arm/mach-tegra/headavp.S
*
* AVP kernel launcher stub; programs the AVP MMU and jumps to the
* kernel code. Must use ONLY ARMv4 instructions, and must be compiled
* in ARM mode.
*
* Copyright (c) 2010, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include "headavp.h"
#define PTE0_COMPARE 0
/* the default translation will translate any VA within
* 0x0010:0000..0x001f:ffff to the (megabyte-aligned) value written to
* _tegra_avp_boot_stub_data.map_phys_addr
*/
#define PTE0_DEFAULT (AVP_KERNEL_VIRT_BASE | 0x3ff0)
#define PTE0_TRANSLATE 4
#define TRANSLATE_DATA (1 << 11)
#define TRANSLATE_CODE (1 << 10)
#define TRANSLATE_WR (1 << 9)
#define TRANSLATE_RD (1 << 8)
#define TRANSLATE_HIT (1 << 7)
#define TRANSLATE_EN (1 << 2)
#define TRANSLATE_OPT (TRANSLATE_DATA | TRANSLATE_CODE | TRANSLATE_WR | \
TRANSLATE_RD | TRANSLATE_HIT)
ENTRY(_tegra_avp_boot_stub)
adr r4, _tegra_avp_boot_stub_data
ldmia r4, {r0-r3}
#ifdef CONFIG_TEGRA_AVP_KERNEL_ON_MMU
str r2, [r0, #PTE0_COMPARE]
bic r3, r3, #0xff0
bic r3, r3, #0x00f
orr r3, r3, #TRANSLATE_OPT
orr r3, r3, #TRANSLATE_EN
str r3, [r0, #PTE0_TRANSLATE]
#endif
bx r1
b .
ENDPROC(_tegra_avp_boot_stub)
.type _tegra_avp_boot_stub_data, %object
ENTRY(_tegra_avp_boot_stub_data)
.long AVP_MMU_TLB_BASE
.long 0xdeadbeef
.long PTE0_DEFAULT
.long 0xdeadd00d
.size _tegra_avp_boot_stub_data, . - _tegra_avp_boot_stub_data
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