diff options
Diffstat (limited to 'drivers/media/video/tegra/avp/headavp.S')
| -rw-r--r-- | drivers/media/video/tegra/avp/headavp.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/media/video/tegra/avp/headavp.S b/drivers/media/video/tegra/avp/headavp.S new file mode 100644 index 000000000000..c1f8e9fea1cb --- /dev/null +++ b/drivers/media/video/tegra/avp/headavp.S @@ -0,0 +1,68 @@ +/* + * 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 |