489 lines
12 KiB
ArmAsm
489 lines
12 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* linux/arch/arm/mm/proc-arm926.S: MMU functions for ARM926EJ-S
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*
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* Copyright (C) 1999-2001 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd.
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* hacked for non-paged-MM by Hyok S. Choi, 2003.
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*
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* These are the low level assembler for performing cache and TLB
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* functions on the arm926.
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*
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* CONFIG_CPU_ARM926_CPU_IDLE -> nohlt
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/pgtable.h>
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#include <asm/assembler.h>
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#include <asm/hwcap.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include "proc-macros.S"
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/*
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* This is the maximum size of an area which will be invalidated
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* using the single invalidate entry instructions. Anything larger
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* than this, and we go for the whole cache.
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*
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* This value should be chosen such that we choose the cheapest
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* alternative.
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*/
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#define CACHE_DLIMIT 16384
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/*
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* the cache line size of the I and D cache
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*/
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#define CACHE_DLINESIZE 32
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.text
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/*
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* cpu_arm926_proc_init()
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*/
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ENTRY(cpu_arm926_proc_init)
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ret lr
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/*
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* cpu_arm926_proc_fin()
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*/
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ENTRY(cpu_arm926_proc_fin)
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register
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bic r0, r0, #0x1000 @ ...i............
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bic r0, r0, #0x000e @ ............wca.
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mcr p15, 0, r0, c1, c0, 0 @ disable caches
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ret lr
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/*
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* cpu_arm926_reset(loc)
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*
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* Perform a soft reset of the system. Put the CPU into the
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* same state as it would be if it had been reset, and branch
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* to what would be the reset vector.
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*
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* loc: location to jump to for soft reset
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*/
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.align 5
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.pushsection .idmap.text, "ax"
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ENTRY(cpu_arm926_reset)
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
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mcr p15, 0, ip, c7, c10, 4 @ drain WB
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#ifdef CONFIG_MMU
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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#endif
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mrc p15, 0, ip, c1, c0, 0 @ ctrl register
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bic ip, ip, #0x000f @ ............wcam
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bic ip, ip, #0x1100 @ ...i...s........
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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ret r0
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ENDPROC(cpu_arm926_reset)
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.popsection
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/*
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* cpu_arm926_do_idle()
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*
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* Called with IRQs disabled
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*/
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.align 10
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ENTRY(cpu_arm926_do_idle)
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mov r0, #0
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mrc p15, 0, r1, c1, c0, 0 @ Read control register
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mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
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bic r2, r1, #1 << 12
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mrs r3, cpsr @ Disable FIQs while Icache
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orr ip, r3, #PSR_F_BIT @ is disabled
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msr cpsr_c, ip
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mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
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mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
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mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
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msr cpsr_c, r3 @ Restore FIQ state
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ret lr
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/*
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* flush_icache_all()
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*
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* Unconditionally clean and invalidate the entire icache.
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*/
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ENTRY(arm926_flush_icache_all)
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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ret lr
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ENDPROC(arm926_flush_icache_all)
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/*
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* flush_user_cache_all()
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*
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* Clean and invalidate all cache entries in a particular
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* address space.
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*/
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ENTRY(arm926_flush_user_cache_all)
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/* FALLTHROUGH */
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/*
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* flush_kern_cache_all()
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*
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* Clean and invalidate the entire cache.
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*/
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ENTRY(arm926_flush_kern_cache_all)
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mov r2, #VM_EXEC
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mov ip, #0
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__flush_whole_cache:
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
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#else
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1: mrc p15, 0, APSR_nzcv, c7, c14, 3 @ test,clean,invalidate
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bne 1b
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#endif
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tst r2, #VM_EXEC
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mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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ret lr
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/*
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* flush_user_cache_range(start, end, flags)
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*
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* Clean and invalidate a range of cache entries in the
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* specified address range.
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*
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* - start - start address (inclusive)
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* - end - end address (exclusive)
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* - flags - vm_flags describing address space
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*/
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ENTRY(arm926_flush_user_cache_range)
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mov ip, #0
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sub r3, r1, r0 @ calculate total size
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cmp r3, #CACHE_DLIMIT
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bgt __flush_whole_cache
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1: tst r2, #VM_EXEC
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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#else
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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#endif
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cmp r0, r1
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blo 1b
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tst r2, #VM_EXEC
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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ret lr
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/*
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* coherent_kern_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start, end. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(arm926_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* coherent_user_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start, end. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(arm926_coherent_user_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov r0, #0
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ret lr
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/*
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* flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure no D cache aliasing occurs, either with itself or
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* the I cache
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*
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* - addr - kernel address
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* - size - region size
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*/
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ENTRY(arm926_flush_kern_dcache_area)
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add r1, r0, r1
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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ret lr
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/*
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* dma_inv_range(start, end)
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*
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* Invalidate (discard) the specified virtual address range.
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* May not write back any entries. If 'start' or 'end'
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* are not cache line aligned, those lines must be written
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* back.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* (same as v4wb)
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*/
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arm926_dma_inv_range:
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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tst r0, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
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tst r1, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
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#endif
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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ret lr
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/*
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* dma_clean_range(start, end)
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*
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* Clean the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* (same as v4wb)
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*/
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arm926_dma_clean_range:
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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#endif
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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ret lr
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/*
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* dma_flush_range(start, end)
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*
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* Clean and invalidate the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(arm926_dma_flush_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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1:
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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#else
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mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
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#endif
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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ret lr
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/*
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* dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(arm926_dma_map_area)
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add r1, r1, r0
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cmp r2, #DMA_TO_DEVICE
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beq arm926_dma_clean_range
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bcs arm926_dma_inv_range
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b arm926_dma_flush_range
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ENDPROC(arm926_dma_map_area)
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/*
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* dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(arm926_dma_unmap_area)
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ret lr
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ENDPROC(arm926_dma_unmap_area)
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.globl arm926_flush_kern_cache_louis
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.equ arm926_flush_kern_cache_louis, arm926_flush_kern_cache_all
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions arm926
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ENTRY(cpu_arm926_dcache_clean_area)
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #CACHE_DLINESIZE
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subs r1, r1, #CACHE_DLINESIZE
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bhi 1b
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#endif
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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ret lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_arm926_switch_mm(pgd)
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*
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* Set the translation base pointer to be as described by pgd.
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*
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* pgd: new page tables
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*/
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.align 5
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ENTRY(cpu_arm926_switch_mm)
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#ifdef CONFIG_MMU
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mov ip, #0
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
|
||
|
|
#else
|
||
|
|
@ && 'Clean & Invalidate whole DCache'
|
||
|
|
1: mrc p15, 0, APSR_nzcv, c7, c14, 3 @ test,clean,invalidate
|
||
|
|
bne 1b
|
||
|
|
#endif
|
||
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
||
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
||
|
|
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
|
||
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
||
|
|
#endif
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cpu_arm926_set_pte_ext(ptep, pte, ext)
|
||
|
|
*
|
||
|
|
* Set a PTE and flush it out
|
||
|
|
*/
|
||
|
|
.align 5
|
||
|
|
ENTRY(cpu_arm926_set_pte_ext)
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
armv3_set_pte_ext
|
||
|
|
mov r0, r0
|
||
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
||
|
|
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
||
|
|
#endif
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
||
|
|
#endif
|
||
|
|
ret lr
|
||
|
|
|
||
|
|
/* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
|
||
|
|
.globl cpu_arm926_suspend_size
|
||
|
|
.equ cpu_arm926_suspend_size, 4 * 3
|
||
|
|
#ifdef CONFIG_ARM_CPU_SUSPEND
|
||
|
|
ENTRY(cpu_arm926_do_suspend)
|
||
|
|
stmfd sp!, {r4 - r6, lr}
|
||
|
|
mrc p15, 0, r4, c13, c0, 0 @ PID
|
||
|
|
mrc p15, 0, r5, c3, c0, 0 @ Domain ID
|
||
|
|
mrc p15, 0, r6, c1, c0, 0 @ Control register
|
||
|
|
stmia r0, {r4 - r6}
|
||
|
|
ldmfd sp!, {r4 - r6, pc}
|
||
|
|
ENDPROC(cpu_arm926_do_suspend)
|
||
|
|
|
||
|
|
ENTRY(cpu_arm926_do_resume)
|
||
|
|
mov ip, #0
|
||
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs
|
||
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches
|
||
|
|
ldmia r0, {r4 - r6}
|
||
|
|
mcr p15, 0, r4, c13, c0, 0 @ PID
|
||
|
|
mcr p15, 0, r5, c3, c0, 0 @ Domain ID
|
||
|
|
mcr p15, 0, r1, c2, c0, 0 @ TTB address
|
||
|
|
mov r0, r6 @ control register
|
||
|
|
b cpu_resume_mmu
|
||
|
|
ENDPROC(cpu_arm926_do_resume)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
.type __arm926_setup, #function
|
||
|
|
__arm926_setup:
|
||
|
|
mov r0, #0
|
||
|
|
mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
|
||
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
|
||
|
|
mov r0, #4 @ disable write-back on caches explicitly
|
||
|
|
mcr p15, 7, r0, c15, c0, 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
adr r5, arm926_crval
|
||
|
|
ldmia r5, {r5, r6}
|
||
|
|
mrc p15, 0, r0, c1, c0 @ get control register v4
|
||
|
|
bic r0, r0, r5
|
||
|
|
orr r0, r0, r6
|
||
|
|
#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
|
||
|
|
orr r0, r0, #0x4000 @ .1.. .... .... ....
|
||
|
|
#endif
|
||
|
|
ret lr
|
||
|
|
.size __arm926_setup, . - __arm926_setup
|
||
|
|
|
||
|
|
/*
|
||
|
|
* R
|
||
|
|
* .RVI ZFRS BLDP WCAM
|
||
|
|
* .011 0001 ..11 0101
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
.type arm926_crval, #object
|
||
|
|
arm926_crval:
|
||
|
|
crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
|
||
|
|
|
||
|
|
__INITDATA
|
||
|
|
|
||
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
||
|
|
define_processor_functions arm926, dabort=v5tj_early_abort, pabort=legacy_pabort, suspend=1
|
||
|
|
|
||
|
|
.section ".rodata"
|
||
|
|
|
||
|
|
string cpu_arch_name, "armv5tej"
|
||
|
|
string cpu_elf_name, "v5"
|
||
|
|
string cpu_arm926_name, "ARM926EJ-S"
|
||
|
|
|
||
|
|
.align
|
||
|
|
|
||
|
|
.section ".proc.info.init", "a"
|
||
|
|
|
||
|
|
.type __arm926_proc_info,#object
|
||
|
|
__arm926_proc_info:
|
||
|
|
.long 0x41069260 @ ARM926EJ-S (v5TEJ)
|
||
|
|
.long 0xff0ffff0
|
||
|
|
.long PMD_TYPE_SECT | \
|
||
|
|
PMD_SECT_BUFFERABLE | \
|
||
|
|
PMD_SECT_CACHEABLE | \
|
||
|
|
PMD_BIT4 | \
|
||
|
|
PMD_SECT_AP_WRITE | \
|
||
|
|
PMD_SECT_AP_READ
|
||
|
|
.long PMD_TYPE_SECT | \
|
||
|
|
PMD_BIT4 | \
|
||
|
|
PMD_SECT_AP_WRITE | \
|
||
|
|
PMD_SECT_AP_READ
|
||
|
|
initfn __arm926_setup, __arm926_proc_info
|
||
|
|
.long cpu_arch_name
|
||
|
|
.long cpu_elf_name
|
||
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
|
||
|
|
.long cpu_arm926_name
|
||
|
|
.long arm926_processor_functions
|
||
|
|
.long v4wbi_tlb_fns
|
||
|
|
.long v4wb_user_fns
|
||
|
|
.long arm926_cache_fns
|
||
|
|
.size __arm926_proc_info, . - __arm926_proc_info
|