/* * 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 #include #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