c8c90860cd
Commit 81d11955bf ("ARM: 6405/1: Handle __flush_icache_all for
CONFIG_SMP_ON_UP") added a new function to struct cpu_cache_fns:
flush_icache_all(). It also implemented this for v6 and v7 but not
for v5 and backwards. Without the function pointer in place, we
will be calling wrong cache functions.
For example with ep93xx we get following:
Unable to handle kernel paging request at virtual address ee070f38
pgd = c0004000
[ee070f38] *pgd=00000000
Internal error: Oops: 80000005 [#1] PREEMPT
last sysfs file:
Modules linked in:
CPU: 0 Not tainted (2.6.36+ #1)
PC is at 0xee070f38
LR is at __dma_alloc+0x11c/0x2d0
pc : [<ee070f38>] lr : [<c0032c8c>] psr: 60000013
sp : c581bde0 ip : 00000000 fp : c0472000
r10: c0472000 r9 : 000000d0 r8 : 00020000
r7 : 0001ffff r6 : 00000000 r5 : c0472400 r4 : c5980000
r3 : c03ab7e0 r2 : 00000000 r1 : c59a0000 r0 : c5980000
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: c000717f Table: c0004000 DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc581a270)
[<c0032c8c>] (__dma_alloc+0x11c/0x2d0)
[<c0032e5c>] (dma_alloc_writecombine+0x1c/0x24)
[<c0204148>] (ep93xx_pcm_preallocate_dma_buffer+0x44/0x60)
[<c02041c0>] (ep93xx_pcm_new+0x5c/0x88)
[<c01ff188>] (snd_soc_instantiate_cards+0x8a8/0xbc0)
[<c01ff59c>] (soc_probe+0xfc/0x134)
[<c01adafc>] (platform_drv_probe+0x18/0x1c)
[<c01acca4>] (driver_probe_device+0xb0/0x16c)
[<c01ac284>] (bus_for_each_drv+0x48/0x84)
[<c01ace90>] (device_attach+0x50/0x68)
[<c01ac0f8>] (bus_probe_device+0x24/0x44)
[<c01aad7c>] (device_add+0x2fc/0x44c)
[<c01adfa8>] (platform_device_add+0x104/0x15c)
[<c0015eb8>] (simone_init+0x60/0x94)
[<c0021410>] (do_one_initcall+0xd0/0x1a4)
__dma_alloc() calls (inlined) __dma_alloc_buffer() which ends up
calling dmac_flush_range(). Now since the entries in the
arm920_cache_fns are shifted by one, we jump into address 0xee070f38
which is actually next instruction after the arm920_cache_fns
structure.
So implement flush_icache_all() for the rest of the supported CPUs
using a generic 'invalidate I cache' instruction.
Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
505 lines
12 KiB
ArmAsm
505 lines
12 KiB
ArmAsm
/*
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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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* 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 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 <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/pgtable.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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mov pc, 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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mov pc, 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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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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mov pc, r0
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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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mov pc, 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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mov pc, 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, r15, 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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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(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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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(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 pc, 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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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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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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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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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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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(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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mov pc, 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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mov pc, lr
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ENDPROC(arm926_dma_unmap_area)
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ENTRY(arm926_cache_fns)
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.long arm926_flush_icache_all
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.long arm926_flush_kern_cache_all
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.long arm926_flush_user_cache_all
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.long arm926_flush_user_cache_range
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.long arm926_coherent_kern_range
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.long arm926_coherent_user_range
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.long arm926_flush_kern_dcache_area
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.long arm926_dma_map_area
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.long arm926_dma_unmap_area
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.long arm926_dma_flush_range
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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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mov pc, 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
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#else
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@ && 'Clean & Invalidate whole DCache'
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1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
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bne 1b
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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_arm926_set_pte_ext(ptep, pte, ext)
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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_arm926_set_pte_ext)
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#ifdef CONFIG_MMU
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armv3_set_pte_ext
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mov r0, r0
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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#endif
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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#endif
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mov pc, lr
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__CPUINIT
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.type __arm926_setup, #function
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__arm926_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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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mov r0, #4 @ disable write-back on caches explicitly
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mcr p15, 7, r0, c15, c0, 0
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#endif
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adr r5, arm926_crval
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ldmia r5, {r5, r6}
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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
|
|
mov pc, 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
|
|
|
|
/*
|
|
* Purpose : Function pointers used to access above functions - all calls
|
|
* come through these
|
|
*/
|
|
.type arm926_processor_functions, #object
|
|
arm926_processor_functions:
|
|
.word v5tj_early_abort
|
|
.word legacy_pabort
|
|
.word cpu_arm926_proc_init
|
|
.word cpu_arm926_proc_fin
|
|
.word cpu_arm926_reset
|
|
.word cpu_arm926_do_idle
|
|
.word cpu_arm926_dcache_clean_area
|
|
.word cpu_arm926_switch_mm
|
|
.word cpu_arm926_set_pte_ext
|
|
.size arm926_processor_functions, . - arm926_processor_functions
|
|
|
|
.section ".rodata"
|
|
|
|
.type cpu_arch_name, #object
|
|
cpu_arch_name:
|
|
.asciz "armv5tej"
|
|
.size cpu_arch_name, . - cpu_arch_name
|
|
|
|
.type cpu_elf_name, #object
|
|
cpu_elf_name:
|
|
.asciz "v5"
|
|
.size cpu_elf_name, . - cpu_elf_name
|
|
|
|
.type cpu_arm926_name, #object
|
|
cpu_arm926_name:
|
|
.asciz "ARM926EJ-S"
|
|
.size cpu_arm926_name, . - cpu_arm926_name
|
|
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
|
|
|
.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
|
|
b __arm926_setup
|
|
.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
|