/* SPDX-License-Identifier: GPL-2.0 */
/*
* We need constants.h for:
* VMA_VM_MM
* VMA_VM_FLAGS
* VM_EXEC
*/
#include <asm/asm-offsets.h>
#include <asm/pgtable.h>
#include <asm/thread_info.h>
#ifdef CONFIG_CPU_V7M
#include <asm/v7m.h>
#endif
/*
* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
*/
.macro vma_vm_mm, rd, rn
ldr \rd, [\rn, #VMA_VM_MM]
.endm
/*
* vma_vm_flags - get vma->vm_flags
*/
.macro vma_vm_flags, rd, rn
ldr \rd, [\rn, #VMA_VM_FLAGS]
.endm
/*
* act_mm - get current->active_mm
*/
.macro act_mm, rd
get_current \rd
.if (TSK_ACTIVE_MM > IMM12_MASK)
add \rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK
.endif
ldr \rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK]
.endm
/*
* mmid - get context id from mm pointer (mm->context.id)
* note, this field is 64bit, so in big-endian the two words are swapped too.
*/
.macro mmid, rd, rn
#ifdef __ARMEB__
ldr \rd, [\rn, #MM_CONTEXT_ID + 4 ]
#else
ldr \rd, [\rn, #MM_CONTEXT_ID]
#endif
.endm
/*
* mask_asid - mask the ASID from the context ID
*/
.macro asid, rd, rn
and \rd, \rn, #255
.endm
.macro crval, clear, mmuset, ucset
#ifdef CONFIG_MMU
.word \clear
.word \mmuset
#else
.word \clear
.word \ucset
#endif
.endm
/*
* dcache_line_size - get the minimum D-cache line size from the CTR register
* on ARMv7.
*/
.macro dcache_line_size, reg, tmp
#ifdef CONFIG_CPU_V7M
movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
ldr \tmp, [\tmp]
#else
mrc p15, 0, \tmp, c0, c0, 1 @ read ctr
#endif
lsr \tmp, \tmp, #16
and \tmp, \tmp, #0xf @ cache line size encoding
mov \reg, #4 @ bytes per word
mov \reg, \reg, lsl \tmp @ actual cache line size
.endm
/*
* icache_line_size - get the minimum I-cache line size from the CTR register
* on ARMv7.
*/
.macro icache_line_size, reg, tmp
#ifdef CONFIG_CPU_V7M
movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
ldr \tmp, [\tmp]
#else
mrc p15, 0, \tmp, c0, c0, 1 @ read ctr
#endif
and \tmp, \tmp, #0xf @ cache line size encoding
mov \reg, #4 @ bytes per word
mov \reg, \reg, lsl \tmp @ actual cache line size
.endm
/*
* Sanity check the PTE configuration for the code below - which makes
* certain assumptions about how these bits are laid out.
*/
#ifdef CONFIG_MMU
#if L_PTE_SHARED != PTE_EXT_SHARED
#error PTE shared bit mismatch
#endif
#if !defined (CONFIG_ARM_LPAE) && \
(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
L_PTE_PRESENT) > L_PTE_SHARED
#error Invalid Linux PTE bit settings
#endif
#endif /* CONFIG_MMU */
/*
* The ARMv6 and ARMv7 set_pte_ext translation function.
*
* Permission translation:
* YUWD APX AP1 AP0 SVC User
* 0xxx 0 0 0 no acc no acc
* 100x 1 0 1 r/o no acc
* 10x0 1 0 1 r/o no acc
* 1011 0 0 1 r/w no acc
* 110x 1 1 1 r/o r/o
* 11x0 1 1 1 r/o r/o
* 1111 0 1 1 r/w r/w
*/
.macro armv6_mt_table pfx
\pfx\()_mt_table:
.long 0x00 @ L_PTE_MT_UNCACHED
.long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE
.long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
.long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
.long PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
.long 0x00 @ unused
.long 0x00 @ L_PTE_MT_MINICACHE (not present)
.long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
.long 0x00 @ unused
.long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
.long 0x00 @ unused
.long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
.long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
.long 0x00 @ unused
.long 0x00 @ unused
.long PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX @ L_PTE_MT_VECTORS
.endm
.macro armv6_set_pte_ext pfx
str r1, [r0], #2048 @ linux version
bic r3, r1, #0x000003fc
bic r3, r3, #PTE_TYPE_MASK
orr r3, r3, r2
orr r3, r3, #PTE_EXT_AP0 | 2
adr ip, \pfx\()_mt_table
and r2, r1, #L_PTE_MT_MASK
ldr r2, [ip, r2]
eor r1, r1, #L_PTE_DIRTY
tst r1, #L_PTE_DIRTY|L_PTE_RDONLY
orrne r3, r3, #PTE_EXT_APX
tst r1, #L_PTE_USER
orrne r3, r3, #PTE_EXT_AP1
tstne r3, #PTE_EXT_APX
@ user read-only -> kernel read-only
bicne r3, r3, #PTE_EXT_AP0
tst r1, #L_PTE_XN
orrne r3, r3, #PTE_EXT_XN
eor r3, r3, r2
tst r1, #L_PTE_YOUNG
tstne r1, #L_PTE_PRESENT
moveq r3, #0
tstne r1, #L_PTE_NONE
movne r3, #0
str r3, [r0]
mcr p15, 0, r0, c7, c10, 1 @ flush_pte
.endm
/*
* The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
* covering most CPUs except Xscale and Xscale 3.
*
* Permission translation:
* YUWD AP SVC User
* 0xxx 0x00 no acc no acc
* 100x 0x00 r/o no acc
* 10x0 0x00 r/o no acc
* 1011 0x55 r/w no acc
* 110x 0xaa r/w r/o
* 11x0 0xaa r/w r/o
* 1111 0xff r/w r/w
*/
.macro armv3_set_pte_ext wc_disable=1
str r1, [r0], #2048 @ linux version
eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
bic r2, r2, #PTE_TYPE_MASK
orr r2, r2, #PTE_TYPE_SMALL
tst r3, #L_PTE_USER @ user?
orrne r2, r2, #PTE_SMALL_AP_URO_SRW
tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty?
orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
movne r2, #0
.if \wc_disable
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
tst r2, #PTE_CACHEABLE
bicne r2, r2, #PTE_BUFFERABLE
#endif
.endif
str r2, [r0] @ hardware version
.endm
/*
* Xscale set_pte_ext translation, split into two halves to cope
* with work-arounds. r3 must be preserved by code between these
* two macros.
*
* Permission translation:
* YUWD AP SVC User
* 0xxx 00 no acc no acc
* 100x 00 r/o no acc
* 10x0 00 r/o no acc
* 1011 01 r/w no acc
* 110x 10 r/w r/o
* 11x0 10 r/w r/o
* 1111 11 r/w r/w
*/
.macro xscale_set_pte_ext_prologue
str r1, [r0] @ linux version
eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
orr r2, r2, #PTE_TYPE_EXT @ extended page
tst r3, #L_PTE_USER @ user?
orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty?
orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w
@ combined with user -> user r/w
.endm
.macro xscale_set_pte_ext_epilogue
tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
movne r2, #0 @ no -> fault
str r2, [r0, #2048]! @ hardware version
mov ip, #0
mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
mcr p15, 0, ip, c7, c10, 4 @ data write barrier
.endm
.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0
/*
* If we are building for big.Little with branch predictor hardening,
* we need the processor function tables to remain available after boot.
*/
#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
.section ".rodata"
#endif
.type \name\()_processor_functions, #object
.align 2
ENTRY(\name\()_processor_functions)
.word \dabort
.word \pabort
.word cpu_\name\()_proc_init
.word \bugs
.word cpu_\name\()_proc_fin
.word cpu_\name\()_reset
.word cpu_\name\()_do_idle
.word cpu_\name\()_dcache_clean_area
.word cpu_\name\()_switch_mm
.if \nommu
.word 0
.else
.word cpu_\name\()_set_pte_ext
.endif
.if \suspend
.word cpu_\name\()_suspend_size
#ifdef CONFIG_ARM_CPU_SUSPEND
.word cpu_\name\()_do_suspend
.word cpu_\name\()_do_resume
#else
.word 0
.word 0
#endif
.else
.word 0
.word 0
.word 0
.endif
.size \name\()_processor_functions, . - \name\()_processor_functions
#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
.previous
#endif
.endm
.macro globl_equ x, y
.globl \x
.equ \x, \y
.endm
.macro initfn, func, base
.long \func - \base
.endm
/*
* Macro to calculate the log2 size for the protection region
* registers. This calculates rd = log2(size) - 1. tmp must
* not be the same register as rd.
*/
.macro pr_sz, rd, size, tmp
mov \tmp, \size, lsr #12
mov \rd, #11
1: movs \tmp, \tmp, lsr #1
addne \rd, \rd, #1
bne 1b
.endm
/*
* Macro to generate a protection region register value
* given a pre-masked address, size, and enable bit.
* Corrupts size.
*/
.macro pr_val, dest, addr, size, enable
pr_sz \dest, \size, \size @ calculate log2(size) - 1
orr \dest, \addr, \dest, lsl #1 @ mask in the region size
orr \dest, \dest, \enable
.endm
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