mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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b4d20eff64
Instead of defining all cache flush operations with an assembly macro in proc-macros.S, provide an explicit struct cpu_cache_fns for each CPU cache type in mm/cache.c. As a side effect from rewriting the vtables in C, we can avoid the aliasing for the "louis" cache callback, instead we can just assign the NN_flush_kern_cache_all() function to the louis callback in the C vtable. As the louis cache callback is called explicitly (not through the vtable) if we only have one type of cache support compiled in, we need an ifdef quirk for this in the !MULTI_CACHE case. Feroceon and XScale have some dma mapping quirk, in this case we can just define two structs and assign all but one callback to the main implementation; since each of them invoked define_cache_functions twice they require MULTI_CACHE by definition so the compiled-in shortcut is not used on these variants. Tested-by: Kees Cook <keescook@chromium.org> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
355 lines
8.2 KiB
ArmAsm
355 lines
8.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* We need constants.h for:
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* VMA_VM_MM
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* VMA_VM_FLAGS
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* VM_EXEC
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*/
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#include <asm/asm-offsets.h>
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#include <asm/pgtable.h>
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#include <asm/thread_info.h>
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#ifdef CONFIG_CPU_V7M
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#include <asm/v7m.h>
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#endif
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/*
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* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
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*/
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.macro vma_vm_mm, rd, rn
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ldr \rd, [\rn, #VMA_VM_MM]
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.endm
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/*
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* vma_vm_flags - get vma->vm_flags
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*/
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.macro vma_vm_flags, rd, rn
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ldr \rd, [\rn, #VMA_VM_FLAGS]
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.endm
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/*
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* act_mm - get current->active_mm
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*/
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.macro act_mm, rd
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get_current \rd
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.if (TSK_ACTIVE_MM > IMM12_MASK)
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add \rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK
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.endif
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ldr \rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK]
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.endm
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/*
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* mmid - get context id from mm pointer (mm->context.id)
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* note, this field is 64bit, so in big-endian the two words are swapped too.
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*/
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.macro mmid, rd, rn
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#ifdef __ARMEB__
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ldr \rd, [\rn, #MM_CONTEXT_ID + 4 ]
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#else
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ldr \rd, [\rn, #MM_CONTEXT_ID]
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#endif
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.endm
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/*
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* mask_asid - mask the ASID from the context ID
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*/
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.macro asid, rd, rn
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and \rd, \rn, #255
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.endm
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.macro crval, clear, mmuset, ucset
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#ifdef CONFIG_MMU
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.word \clear
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.word \mmuset
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#else
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.word \clear
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.word \ucset
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#endif
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.endm
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/*
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* dcache_line_size - get the minimum D-cache line size from the CTR register
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* on ARMv7.
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*/
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.macro dcache_line_size, reg, tmp
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#ifdef CONFIG_CPU_V7M
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movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
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movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
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ldr \tmp, [\tmp]
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#else
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mrc p15, 0, \tmp, c0, c0, 1 @ read ctr
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#endif
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lsr \tmp, \tmp, #16
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and \tmp, \tmp, #0xf @ cache line size encoding
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mov \reg, #4 @ bytes per word
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mov \reg, \reg, lsl \tmp @ actual cache line size
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.endm
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/*
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* icache_line_size - get the minimum I-cache line size from the CTR register
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* on ARMv7.
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*/
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.macro icache_line_size, reg, tmp
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#ifdef CONFIG_CPU_V7M
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movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
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movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
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ldr \tmp, [\tmp]
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#else
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mrc p15, 0, \tmp, c0, c0, 1 @ read ctr
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#endif
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and \tmp, \tmp, #0xf @ cache line size encoding
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mov \reg, #4 @ bytes per word
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mov \reg, \reg, lsl \tmp @ actual cache line size
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.endm
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/*
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* Sanity check the PTE configuration for the code below - which makes
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* certain assumptions about how these bits are laid out.
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*/
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#ifdef CONFIG_MMU
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#if L_PTE_SHARED != PTE_EXT_SHARED
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#error PTE shared bit mismatch
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#endif
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#if !defined (CONFIG_ARM_LPAE) && \
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(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
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L_PTE_PRESENT) > L_PTE_SHARED
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#error Invalid Linux PTE bit settings
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#endif
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#endif /* CONFIG_MMU */
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/*
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* The ARMv6 and ARMv7 set_pte_ext translation function.
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*
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* Permission translation:
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* YUWD APX AP1 AP0 SVC User
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* 0xxx 0 0 0 no acc no acc
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* 100x 1 0 1 r/o no acc
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* 10x0 1 0 1 r/o no acc
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* 1011 0 0 1 r/w no acc
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* 110x 1 1 1 r/o r/o
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* 11x0 1 1 1 r/o r/o
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* 1111 0 1 1 r/w r/w
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*/
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.macro armv6_mt_table pfx
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\pfx\()_mt_table:
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.long 0x00 @ L_PTE_MT_UNCACHED
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.long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE
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.long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
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.long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
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.long PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
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.long 0x00 @ unused
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.long 0x00 @ L_PTE_MT_MINICACHE (not present)
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.long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
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.long 0x00 @ unused
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.long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
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.long 0x00 @ unused
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.long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
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.long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
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.long 0x00 @ unused
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.long 0x00 @ unused
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.long PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX @ L_PTE_MT_VECTORS
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.endm
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.macro armv6_set_pte_ext pfx
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str r1, [r0], #2048 @ linux version
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bic r3, r1, #0x000003fc
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bic r3, r3, #PTE_TYPE_MASK
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orr r3, r3, r2
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orr r3, r3, #PTE_EXT_AP0 | 2
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adr ip, \pfx\()_mt_table
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and r2, r1, #L_PTE_MT_MASK
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ldr r2, [ip, r2]
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eor r1, r1, #L_PTE_DIRTY
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tst r1, #L_PTE_DIRTY|L_PTE_RDONLY
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orrne r3, r3, #PTE_EXT_APX
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tst r1, #L_PTE_USER
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orrne r3, r3, #PTE_EXT_AP1
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tstne r3, #PTE_EXT_APX
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@ user read-only -> kernel read-only
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bicne r3, r3, #PTE_EXT_AP0
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tst r1, #L_PTE_XN
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orrne r3, r3, #PTE_EXT_XN
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eor r3, r3, r2
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tst r1, #L_PTE_YOUNG
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tstne r1, #L_PTE_PRESENT
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moveq r3, #0
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tstne r1, #L_PTE_NONE
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movne r3, #0
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str r3, [r0]
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mcr p15, 0, r0, c7, c10, 1 @ flush_pte
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.endm
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/*
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* The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
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* covering most CPUs except Xscale and Xscale 3.
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*
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* Permission translation:
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* YUWD AP SVC User
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* 0xxx 0x00 no acc no acc
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* 100x 0x00 r/o no acc
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* 10x0 0x00 r/o no acc
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* 1011 0x55 r/w no acc
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* 110x 0xaa r/w r/o
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* 11x0 0xaa r/w r/o
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* 1111 0xff r/w r/w
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*/
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.macro armv3_set_pte_ext wc_disable=1
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str r1, [r0], #2048 @ linux version
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eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
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bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
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bic r2, r2, #PTE_TYPE_MASK
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orr r2, r2, #PTE_TYPE_SMALL
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tst r3, #L_PTE_USER @ user?
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orrne r2, r2, #PTE_SMALL_AP_URO_SRW
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tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty?
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orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
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tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
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movne r2, #0
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.if \wc_disable
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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tst r2, #PTE_CACHEABLE
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bicne r2, r2, #PTE_BUFFERABLE
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#endif
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.endif
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str r2, [r0] @ hardware version
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.endm
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/*
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* Xscale set_pte_ext translation, split into two halves to cope
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* with work-arounds. r3 must be preserved by code between these
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* two macros.
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*
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* Permission translation:
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* YUWD AP SVC User
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* 0xxx 00 no acc no acc
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* 100x 00 r/o no acc
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* 10x0 00 r/o no acc
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* 1011 01 r/w no acc
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* 110x 10 r/w r/o
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* 11x0 10 r/w r/o
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* 1111 11 r/w r/w
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*/
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.macro xscale_set_pte_ext_prologue
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str r1, [r0] @ linux version
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eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
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bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
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orr r2, r2, #PTE_TYPE_EXT @ extended page
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tst r3, #L_PTE_USER @ user?
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orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
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tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty?
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orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w
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@ combined with user -> user r/w
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.endm
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.macro xscale_set_pte_ext_epilogue
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tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
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movne r2, #0 @ no -> fault
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str r2, [r0, #2048]! @ hardware version
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mov ip, #0
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mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
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mcr p15, 0, ip, c7, c10, 4 @ data write barrier
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.endm
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.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0
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/*
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* If we are building for big.Little with branch predictor hardening,
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* we need the processor function tables to remain available after boot.
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*/
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#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
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.section ".rodata"
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#endif
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.type \name\()_processor_functions, #object
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.align 2
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ENTRY(\name\()_processor_functions)
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.word \dabort
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.word \pabort
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.word cpu_\name\()_proc_init
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.word \bugs
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.word cpu_\name\()_proc_fin
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.word cpu_\name\()_reset
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.word cpu_\name\()_do_idle
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.word cpu_\name\()_dcache_clean_area
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.word cpu_\name\()_switch_mm
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.if \nommu
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.word 0
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.else
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.word cpu_\name\()_set_pte_ext
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.endif
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.if \suspend
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.word cpu_\name\()_suspend_size
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#ifdef CONFIG_ARM_CPU_SUSPEND
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.word cpu_\name\()_do_suspend
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.word cpu_\name\()_do_resume
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#else
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.word 0
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.word 0
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#endif
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.else
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.word 0
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.word 0
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.word 0
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.endif
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.size \name\()_processor_functions, . - \name\()_processor_functions
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#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
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.previous
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#endif
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.endm
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.macro globl_equ x, y
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.globl \x
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.equ \x, \y
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.endm
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.macro initfn, func, base
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.long \func - \base
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.endm
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/*
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* Macro to calculate the log2 size for the protection region
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* registers. This calculates rd = log2(size) - 1. tmp must
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* not be the same register as rd.
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*/
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.macro pr_sz, rd, size, tmp
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mov \tmp, \size, lsr #12
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mov \rd, #11
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1: movs \tmp, \tmp, lsr #1
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addne \rd, \rd, #1
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bne 1b
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.endm
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/*
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* Macro to generate a protection region register value
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* given a pre-masked address, size, and enable bit.
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* Corrupts size.
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*/
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.macro pr_val, dest, addr, size, enable
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pr_sz \dest, \size, \size @ calculate log2(size) - 1
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orr \dest, \addr, \dest, lsl #1 @ mask in the region size
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orr \dest, \dest, \enable
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.endm
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