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6ebbf2ce43
ARMv6 and greater introduced a new instruction ("bx") which can be used
to return from function calls. Recent CPUs perform better when the
"bx lr" instruction is used rather than the "mov pc, lr" instruction,
and this sequence is strongly recommended to be used by the ARM
architecture manual (section A.4.1.1).
We provide a new macro "ret" with all its variants for the condition
code which will resolve to the appropriate instruction.
Rather than doing this piecemeal, and miss some instances, change all
the "mov pc" instances to use the new macro, with the exception of
the "movs" instruction and the kprobes code. This allows us to detect
the "mov pc, lr" case and fix it up - and also gives us the possibility
of deploying this for other registers depending on the CPU selection.
Reported-by: Will Deacon <will.deacon@arm.com>
Tested-by: Stephen Warren <swarren@nvidia.com> # Tegra Jetson TK1
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> # mioa701_bootresume.S
Tested-by: Andrew Lunn <andrew@lunn.ch> # Kirkwood
Tested-by: Shawn Guo <shawn.guo@freescale.com>
Tested-by: Tony Lindgren <tony@atomide.com> # OMAPs
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> # Armada XP, 375, 385
Acked-by: Sekhar Nori <nsekhar@ti.com> # DaVinci
Acked-by: Christoffer Dall <christoffer.dall@linaro.org> # kvm/hyp
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> # PXA3xx
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> # Xen
Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # ARMv7M
Tested-by: Simon Horman <horms+renesas@verge.net.au> # Shmobile
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
274 lines
6.8 KiB
ArmAsm
274 lines
6.8 KiB
ArmAsm
/*
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* linux/arch/arm/mm/proc-sa1100.S
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*
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* Copyright (C) 1997-2002 Russell King
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* MMU functions for SA110
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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 StrongARM-1100 and StrongARM-1110.
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*
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* Note that SA1100 and SA1110 share everything but their name and CPU ID.
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*
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* 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
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* Flush the read buffer at context switches
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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/asm-offsets.h>
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#include <asm/hwcap.h>
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#include <mach/hardware.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/pgtable.h>
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#include "proc-macros.S"
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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 DCACHELINESIZE 32
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.section .text
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/*
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* cpu_sa1100_proc_init()
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*/
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ENTRY(cpu_sa1100_proc_init)
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mov r0, #0
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mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
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mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
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ret lr
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/*
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* cpu_sa1100_proc_fin()
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*
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* Prepare the CPU for reset:
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* - Disable interrupts
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* - Clean and turn off caches.
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*/
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ENTRY(cpu_sa1100_proc_fin)
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mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
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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_sa1100_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_sa1100_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_sa1100_reset)
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.popsection
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/*
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* cpu_sa1100_do_idle(type)
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*
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* Cause the processor to idle
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*
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* type: call type:
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* 0 = slow idle
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* 1 = fast idle
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* 2 = switch to slow processor clock
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* 3 = switch to fast processor clock
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*/
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.align 5
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ENTRY(cpu_sa1100_do_idle)
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mov r0, r0 @ 4 nop padding
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mov r0, r0
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mov r0, r0
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mov r0, r0 @ 4 nop padding
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mov r0, r0
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mov r0, r0
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mov r0, #0
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ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
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@ --- aligned to a cache line
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mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
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ldr r1, [r1, #0] @ force switch to MCLK
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mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
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mov r0, r0 @ safety
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mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
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ret lr
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/* ================================= CACHE ================================ */
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/*
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* cpu_sa1100_dcache_clean_area(addr,sz)
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*
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* Clean the specified entry of any caches such that the MMU
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* translation fetches will obtain correct data.
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*
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* addr: cache-unaligned virtual address
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*/
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.align 5
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ENTRY(cpu_sa1100_dcache_clean_area)
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #DCACHELINESIZE
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subs r1, r1, #DCACHELINESIZE
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bhi 1b
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ret lr
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/* =============================== PageTable ============================== */
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/*
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* cpu_sa1100_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_sa1100_switch_mm)
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#ifdef CONFIG_MMU
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str lr, [sp, #-4]!
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bl v4wb_flush_kern_cache_all @ clears IP
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mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
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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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ldr pc, [sp], #4
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#else
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ret lr
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#endif
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/*
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* cpu_sa1100_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_sa1100_set_pte_ext)
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#ifdef CONFIG_MMU
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armv3_set_pte_ext wc_disable=0
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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
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ret lr
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.globl cpu_sa1100_suspend_size
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.equ cpu_sa1100_suspend_size, 4 * 3
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#ifdef CONFIG_ARM_CPU_SUSPEND
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ENTRY(cpu_sa1100_do_suspend)
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stmfd sp!, {r4 - r6, lr}
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mrc p15, 0, r4, c3, c0, 0 @ domain ID
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mrc p15, 0, r5, c13, c0, 0 @ PID
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mrc p15, 0, r6, c1, c0, 0 @ control reg
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stmia r0, {r4 - r6} @ store cp regs
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ldmfd sp!, {r4 - r6, pc}
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ENDPROC(cpu_sa1100_do_suspend)
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ENTRY(cpu_sa1100_do_resume)
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ldmia r0, {r4 - r6} @ load cp regs
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mov ip, #0
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mcr p15, 0, ip, c8, c7, 0 @ flush I+D TLBs
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mcr p15, 0, ip, c7, c7, 0 @ flush I&D cache
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mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
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mcr p15, 0, ip, c9, c0, 5 @ allow user space to use RB
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mcr p15, 0, r4, c3, c0, 0 @ domain ID
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mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
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mcr p15, 0, r5, c13, c0, 0 @ PID
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mov r0, r6 @ control register
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b cpu_resume_mmu
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ENDPROC(cpu_sa1100_do_resume)
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#endif
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.type __sa1100_setup, #function
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__sa1100_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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adr r5, sa1100_crval
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ldmia r5, {r5, r6}
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mrc p15, 0, r0, c1, c0 @ get control register v4
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bic r0, r0, r5
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orr r0, r0, r6
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ret lr
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.size __sa1100_setup, . - __sa1100_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 1101
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*
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*/
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.type sa1100_crval, #object
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sa1100_crval:
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crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
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__INITDATA
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/*
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* SA1100 and SA1110 share the same function calls
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*/
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@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
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define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1
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.section ".rodata"
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string cpu_arch_name, "armv4"
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string cpu_elf_name, "v4"
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string cpu_sa1100_name, "StrongARM-1100"
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string cpu_sa1110_name, "StrongARM-1110"
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.align
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.section ".proc.info.init", #alloc, #execinstr
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.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
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.type __\name\()_proc_info,#object
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__\name\()_proc_info:
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.long \cpu_val
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.long \cpu_mask
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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_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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.long PMD_TYPE_SECT | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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b __sa1100_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_26BIT | HWCAP_FAST_MULT
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.long \cpu_name
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.long sa1100_processor_functions
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.long v4wb_tlb_fns
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.long v4_mc_user_fns
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.long v4wb_cache_fns
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.size __\name\()_proc_info, . - __\name\()_proc_info
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.endm
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sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
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sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name
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