2 * arch/arm/mach-tegra/headavp.S
4 * AVP kernel launcher stub; programs the AVP MMU and jumps to the
5 * kernel code. Must use ONLY ARMv4 instructions, and must be compiled
8 * Copyright (c) 2010, NVIDIA Corporation.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
25 #include <linux/linkage.h>
26 #include <asm/assembler.h>
29 #define PTE0_COMPARE 0
30 /* the default translation will translate any VA within
31 * 0x0010:0000..0x001f:ffff to the (megabyte-aligned) value written to
32 * _tegra_avp_boot_stub_data.map_phys_addr
34 #define PTE0_DEFAULT (AVP_KERNEL_VIRT_BASE | 0x3ff0)
36 #define PTE0_TRANSLATE 4
38 #define TRANSLATE_DATA (1 << 11)
39 #define TRANSLATE_CODE (1 << 10)
40 #define TRANSLATE_WR (1 << 9)
41 #define TRANSLATE_RD (1 << 8)
42 #define TRANSLATE_HIT (1 << 7)
43 #define TRANSLATE_EN (1 << 2)
45 #define TRANSLATE_OPT (TRANSLATE_DATA | TRANSLATE_CODE | TRANSLATE_WR | \
46 TRANSLATE_RD | TRANSLATE_HIT)
48 ENTRY(_tegra_avp_boot_stub)
49 adr r4, _tegra_avp_boot_stub_data
51 str r2, [r0, #PTE0_COMPARE]
54 orr r3, r3, #TRANSLATE_OPT
55 orr r3, r3, #TRANSLATE_EN
56 str r3, [r0, #PTE0_TRANSLATE]
59 ENDPROC(_tegra_avp_boot_stub)
60 .type _tegra_avp_boot_stub_data, %object
61 ENTRY(_tegra_avp_boot_stub_data)
62 .long AVP_MMU_TLB_BASE
66 .size _tegra_avp_boot_stub_data, . - _tegra_avp_boot_stub_data