8799ee9f49
On some CPUs, bit 4 of section mappings means "update the cache when written to". On others, this bit is required to be one, and others it's required to be zero. Finally, on ARMv6 and above, setting it turns on "no execute" and prevents speculative prefetches. With all these combinations, no one value fits all CPUs, so we have to pick a value depending on the CPU type, and the area we're mapping. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
486 lines
12 KiB
ArmAsm
486 lines
12 KiB
ArmAsm
/*
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* linux/arch/arm/mm/proc-arm922.S: MMU functions for ARM922
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*
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* Copyright (C) 1999,2000 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd.
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* Copyright (C) 2001 Altera Corporation
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* hacked for non-paged-MM by Hyok S. Choi, 2003.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 arm922.
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*
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* CONFIG_CPU_ARM922_CPU_IDLE -> nohlt
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*/
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#include <linux/linkage.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <asm/assembler.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/pgtable.h>
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#include <asm/procinfo.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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* The size of one data cache line.
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*/
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#define CACHE_DLINESIZE 32
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/*
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* The number of data cache segments.
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*/
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#define CACHE_DSEGMENTS 4
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/*
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* The number of lines in a cache segment.
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*/
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#define CACHE_DENTRIES 64
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/*
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* This is the size at which it becomes more efficient to
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* clean the whole cache, rather than using the individual
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* cache line maintainence instructions. (I think this should
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* be 32768).
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*/
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#define CACHE_DLIMIT 8192
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.text
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/*
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* cpu_arm922_proc_init()
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*/
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ENTRY(cpu_arm922_proc_init)
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mov pc, lr
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/*
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* cpu_arm922_proc_fin()
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*/
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ENTRY(cpu_arm922_proc_fin)
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stmfd sp!, {lr}
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mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
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msr cpsr_c, ip
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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bl arm922_flush_kern_cache_all
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#else
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bl v4wt_flush_kern_cache_all
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#endif
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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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ldmfd sp!, {pc}
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/*
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* cpu_arm922_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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ENTRY(cpu_arm922_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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mov pc, r0
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/*
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* cpu_arm922_do_idle()
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*/
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.align 5
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ENTRY(cpu_arm922_do_idle)
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mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
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mov pc, lr
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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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(arm922_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(arm922_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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mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
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1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
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2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
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subs r3, r3, #1 << 26
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bcs 2b @ entries 63 to 0
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subs r1, r1, #1 << 5
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bcs 1b @ segments 7 to 0
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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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mov pc, 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(arm922_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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bhs __flush_whole_cache
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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tst r2, #VM_EXEC
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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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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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mov pc, 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(arm922_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(arm922_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 pc, lr
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/*
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* flush_kern_dcache_page(void *page)
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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 - page aligned address
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*/
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ENTRY(arm922_flush_kern_dcache_page)
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add r1, r0, #PAGE_SZ
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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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mov pc, 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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ENTRY(arm922_dma_inv_range)
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tst r0, #CACHE_DLINESIZE - 1
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bic r0, 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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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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mov pc, 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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ENTRY(arm922_dma_clean_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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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 pc, 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(arm922_dma_flush_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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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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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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ENTRY(arm922_cache_fns)
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.long arm922_flush_kern_cache_all
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.long arm922_flush_user_cache_all
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.long arm922_flush_user_cache_range
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.long arm922_coherent_kern_range
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.long arm922_coherent_user_range
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.long arm922_flush_kern_dcache_page
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.long arm922_dma_inv_range
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.long arm922_dma_clean_range
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.long arm922_dma_flush_range
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#endif
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ENTRY(cpu_arm922_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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mov pc, lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_arm922_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_arm922_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
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#else
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@ && 'Clean & Invalidate whole DCache'
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@ && Re-written to use Index Ops.
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@ && Uses registers r1, r3 and ip
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mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 4 segments
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1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
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2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
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subs r3, r3, #1 << 26
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bcs 2b @ entries 63 to 0
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subs r1, r1, #1 << 5
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bcs 1b @ segments 7 to 0
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#endif
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mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
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mcr p15, 0, ip, c7, c10, 4 @ drain WB
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mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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#endif
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mov pc, lr
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/*
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* cpu_arm922_set_pte(ptep, pte)
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*
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* Set a PTE and flush it out
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*/
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.align 5
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ENTRY(cpu_arm922_set_pte)
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#ifdef CONFIG_MMU
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str r1, [r0], #-2048 @ linux version
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eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
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bic r2, r1, #PTE_SMALL_AP_MASK
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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 r1, #L_PTE_USER @ User?
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orrne r2, r2, #PTE_SMALL_AP_URO_SRW
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tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
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orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
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tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
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movne r2, #0
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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eor r3, r2, #0x0a @ C & small page?
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tst r3, #0x0b
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biceq r2, r2, #4
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#endif
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str r2, [r0] @ hardware version
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mov r0, r0
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mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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#endif /* CONFIG_MMU */
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mov pc, lr
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__INIT
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.type __arm922_setup, #function
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__arm922_setup:
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mov r0, #0
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mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
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#ifdef CONFIG_MMU
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mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
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#endif
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mrc p15, 0, r0, c1, c0 @ get control register v4
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ldr r5, arm922_cr1_clear
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bic r0, r0, r5
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ldr r5, arm922_cr1_set
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orr r0, r0, r5
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mov pc, lr
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.size __arm922_setup, . - __arm922_setup
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/*
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* R
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* .RVI ZFRS BLDP WCAM
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* ..11 0001 ..11 0101
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*
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*/
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.type arm922_cr1_clear, #object
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.type arm922_cr1_set, #object
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arm922_cr1_clear:
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.word 0x3f3f
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arm922_cr1_set:
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.word 0x3135
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__INITDATA
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/*
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* Purpose : Function pointers used to access above functions - all calls
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* come through these
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*/
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.type arm922_processor_functions, #object
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arm922_processor_functions:
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.word v4t_early_abort
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.word cpu_arm922_proc_init
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.word cpu_arm922_proc_fin
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.word cpu_arm922_reset
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.word cpu_arm922_do_idle
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.word cpu_arm922_dcache_clean_area
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.word cpu_arm922_switch_mm
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.word cpu_arm922_set_pte
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.size arm922_processor_functions, . - arm922_processor_functions
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.section ".rodata"
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.type cpu_arch_name, #object
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cpu_arch_name:
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.asciz "armv4t"
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.size cpu_arch_name, . - cpu_arch_name
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.type cpu_elf_name, #object
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cpu_elf_name:
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.asciz "v4"
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.size cpu_elf_name, . - cpu_elf_name
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.type cpu_arm922_name, #object
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cpu_arm922_name:
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.asciz "ARM922T"
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.size cpu_arm922_name, . - cpu_arm922_name
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.align
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.section ".proc.info.init", #alloc, #execinstr
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.type __arm922_proc_info,#object
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__arm922_proc_info:
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.long 0x41009220
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.long 0xff00fff0
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.long PMD_TYPE_SECT | \
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PMD_SECT_BUFFERABLE | \
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PMD_SECT_CACHEABLE | \
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PMD_BIT4 | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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.long PMD_TYPE_SECT | \
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PMD_BIT4 | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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b __arm922_setup
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.long cpu_arch_name
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.long cpu_elf_name
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.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
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.long cpu_arm922_name
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.long arm922_processor_functions
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.long v4wbi_tlb_fns
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.long v4wb_user_fns
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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.long arm922_cache_fns
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#else
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.long v4wt_cache_fns
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#endif
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.size __arm922_proc_info, . - __arm922_proc_info
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