3f2bc4d6eb
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142 Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
106 lines
4.3 KiB
C
106 lines
4.3 KiB
C
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/* Architecture-specific VCM functions */
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/* Device attributes */
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/*
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* Sharing attributes. Pick only one.
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*/
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#define VCM_DEV_ATTR_NON_SH (0x00)
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#define VCM_DEV_ATTR_SH (0x04)
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/*
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* Caching attributes. Pick only one.
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*/
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#define VCM_DEV_ATTR_NONCACHED (0x00)
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#define VCM_DEV_ATTR_CACHED_WB_WA (0x01)
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#define VCM_DEV_ATTR_CACHED_WB_NWA (0x02)
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#define VCM_DEV_ATTR_CACHED_WT (0x03)
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/*
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* A "good" default set of attributes: shareable and non-cacheable.
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*/
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#define VCM_DEV_DEFAULT_ATTR (VCM_DEV_ATTR_SH | VCM_DEV_ATTR_NONCACHED)
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/**
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* set_arm7_pte_attr() - Set ARMv7 page table attributes
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* pt_base Virtual address of the first-level page table
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* @va Virtual address whose attributes are to be set
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* @len Page size used to map the given virtual address
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* @attr Attributes to set for this mapping.
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*
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* Modify a mapping attribute. The base address of the page table must
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* be a virtual address containing a valid ARMv7 page table. The
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* virtual address must refer to an existing mapping and must be
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* aligned to the length with which it was mapped. The mapping length
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* must similarly be the same as was specified when the mapping was
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* made (one of 4KB, 64KB, 1MB, or 16MB). The attribute must be one of
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* the shareability attributes above ORed with one of the cacheability
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* attributes. Any previous attributes are completely replaced by the
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* most recent call to this function. This function only sets the
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* cacheability and shareability attributes. This is accomplished by
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* modifying the TEX class and the S bit in the PTE. It is an error to
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* call this function without having called vcm_setup_tex_classes at
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* least once.
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*
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* The return value is zero on success and non-zero on failure.
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*/
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int set_arm7_pte_attr(unsigned long pt_base, unsigned long va,
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unsigned long len, unsigned int attr);
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/**
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* cpu_set_attr() - Set page table attributes on the CPU's page tables
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* @va Virtual address whose attributes are to be set
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* @len Page size used to map the given virtual address
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* @attr Attributes to set for this mapping.
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*
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* Modify a mapping attribute within the ARM page tables. The va must
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* refer to an existing mapping and must be aligned to the length with
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* which it was mapped. The mapping length must similarly be the same
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* as was specified when the mapping was made (one of 4KB, 64KB, 1MB,
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* or 16MB). The attribute must be one of the shareability attributes
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* above ORed with one of the cacheability attributes. Any previous
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* attributes are completely replaced by the most recent call to this
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* function. This function only sets the cacheability and shareability
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* attributes. This is accomplished by modifying the TEX class and the
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* S bit in the PTE. It is an error to call this function without
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* having called vcm_setup_tex_classes at least once. It is an error
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* to call this function on any system using a memory configuration
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* that is anything OTHER than ARMv7 with TEX remap enabled. Only the
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* HW page tables are modified; the Linux page tables are left
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* untouched.
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*
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* The return value is zero on success and non-zero on failure.
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*/
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int cpu_set_attr(unsigned long va, unsigned long len, unsigned int attr);
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/**
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* vcm_setup_tex_classes() - Prepare TEX class table for use
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*
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* Initialize the attribute mapping table by examining the TEX classes
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* used by the CPU and finding the classes that match the device
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* attributes (VCM_DEV_xx) defined above. This function is only
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* relevant if TEX remap is enabled. The results will be unpredictable
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* and irrelevant if TEX remap is not in use. It is an error to call
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* this function in any system using a memory configuration of
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* anything OTHER than ARMv7 with TEX remap enabled.
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*
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* The return value is zero on success or non-zero on failure. In the
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* present version, a failure will result in a panic.
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*/
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int vcm_setup_tex_classes(void);
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