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55bdd69411
This patch adds the base support for the ARMv7-M architecture. It consists of the corresponding arch/arm/mm/ files and various #ifdef's around the kernel. Exception handling is implemented by a subsequent patch. [ukleinek: squash in some changes originating from commit b5717ba (Cortex-M3: Add support for the Microcontroller Prototyping System) from the v2.6.33-arm1 patch stack, port to post 3.6, drop zImage support, drop reorganisation of pt_regs, assert CONFIG_CPU_V7M doesn't leak into installed headers and a few cosmetic changes] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Jonathan Austin <jonathan.austin@arm.com> Tested-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
380 lines
8.1 KiB
C
380 lines
8.1 KiB
C
/*
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* arch/arm/include/asm/assembler.h
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*
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* Copyright (C) 1996-2000 Russell King
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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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* This file contains arm architecture specific defines
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* for the different processors.
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*
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* Do not include any C declarations in this file - it is included by
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* assembler source.
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*/
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#ifndef __ASM_ASSEMBLER_H__
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#define __ASM_ASSEMBLER_H__
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#ifndef __ASSEMBLY__
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#error "Only include this from assembly code"
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#endif
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#include <asm/ptrace.h>
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#include <asm/domain.h>
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#include <asm/opcodes-virt.h>
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#define IOMEM(x) (x)
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/*
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* Endian independent macros for shifting bytes within registers.
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*/
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#ifndef __ARMEB__
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#define pull lsr
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#define push lsl
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#define get_byte_0 lsl #0
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#define get_byte_1 lsr #8
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#define get_byte_2 lsr #16
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#define get_byte_3 lsr #24
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#define put_byte_0 lsl #0
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#define put_byte_1 lsl #8
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#define put_byte_2 lsl #16
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#define put_byte_3 lsl #24
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#else
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#define pull lsl
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#define push lsr
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#define get_byte_0 lsr #24
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#define get_byte_1 lsr #16
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#define get_byte_2 lsr #8
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#define get_byte_3 lsl #0
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#define put_byte_0 lsl #24
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#define put_byte_1 lsl #16
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#define put_byte_2 lsl #8
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#define put_byte_3 lsl #0
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#endif
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/*
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* Data preload for architectures that support it
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*/
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#if __LINUX_ARM_ARCH__ >= 5
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#define PLD(code...) code
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#else
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#define PLD(code...)
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#endif
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/*
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* This can be used to enable code to cacheline align the destination
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* pointer when bulk writing to memory. Experiments on StrongARM and
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* XScale didn't show this a worthwhile thing to do when the cache is not
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* set to write-allocate (this would need further testing on XScale when WA
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* is used).
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*
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* On Feroceon there is much to gain however, regardless of cache mode.
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*/
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#ifdef CONFIG_CPU_FEROCEON
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#define CALGN(code...) code
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#else
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#define CALGN(code...)
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#endif
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/*
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* Enable and disable interrupts
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*/
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#if __LINUX_ARM_ARCH__ >= 6
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.macro disable_irq_notrace
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cpsid i
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.endm
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.macro enable_irq_notrace
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cpsie i
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.endm
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#else
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.macro disable_irq_notrace
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msr cpsr_c, #PSR_I_BIT | SVC_MODE
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.endm
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.macro enable_irq_notrace
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msr cpsr_c, #SVC_MODE
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.endm
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#endif
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.macro asm_trace_hardirqs_off
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#if defined(CONFIG_TRACE_IRQFLAGS)
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stmdb sp!, {r0-r3, ip, lr}
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bl trace_hardirqs_off
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ldmia sp!, {r0-r3, ip, lr}
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#endif
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.endm
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.macro asm_trace_hardirqs_on_cond, cond
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#if defined(CONFIG_TRACE_IRQFLAGS)
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/*
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* actually the registers should be pushed and pop'd conditionally, but
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* after bl the flags are certainly clobbered
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*/
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stmdb sp!, {r0-r3, ip, lr}
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bl\cond trace_hardirqs_on
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ldmia sp!, {r0-r3, ip, lr}
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#endif
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.endm
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.macro asm_trace_hardirqs_on
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asm_trace_hardirqs_on_cond al
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.endm
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.macro disable_irq
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disable_irq_notrace
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asm_trace_hardirqs_off
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.endm
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.macro enable_irq
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asm_trace_hardirqs_on
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enable_irq_notrace
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.endm
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/*
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* Save the current IRQ state and disable IRQs. Note that this macro
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* assumes FIQs are enabled, and that the processor is in SVC mode.
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*/
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.macro save_and_disable_irqs, oldcpsr
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#ifdef CONFIG_CPU_V7M
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mrs \oldcpsr, primask
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#else
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mrs \oldcpsr, cpsr
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#endif
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disable_irq
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.endm
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.macro save_and_disable_irqs_notrace, oldcpsr
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mrs \oldcpsr, cpsr
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disable_irq_notrace
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.endm
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/*
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* Restore interrupt state previously stored in a register. We don't
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* guarantee that this will preserve the flags.
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*/
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.macro restore_irqs_notrace, oldcpsr
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#ifdef CONFIG_CPU_V7M
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msr primask, \oldcpsr
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#else
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msr cpsr_c, \oldcpsr
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#endif
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.endm
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.macro restore_irqs, oldcpsr
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tst \oldcpsr, #PSR_I_BIT
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asm_trace_hardirqs_on_cond eq
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restore_irqs_notrace \oldcpsr
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.endm
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#define USER(x...) \
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9999: x; \
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.pushsection __ex_table,"a"; \
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.align 3; \
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.long 9999b,9001f; \
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.popsection
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#ifdef CONFIG_SMP
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#define ALT_SMP(instr...) \
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9998: instr
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/*
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* Note: if you get assembler errors from ALT_UP() when building with
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* CONFIG_THUMB2_KERNEL, you almost certainly need to use
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* ALT_SMP( W(instr) ... )
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*/
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#define ALT_UP(instr...) \
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.pushsection ".alt.smp.init", "a" ;\
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.long 9998b ;\
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9997: instr ;\
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.if . - 9997b != 4 ;\
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.error "ALT_UP() content must assemble to exactly 4 bytes";\
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.endif ;\
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.popsection
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#define ALT_UP_B(label) \
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.equ up_b_offset, label - 9998b ;\
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.pushsection ".alt.smp.init", "a" ;\
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.long 9998b ;\
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W(b) . + up_b_offset ;\
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.popsection
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#else
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#define ALT_SMP(instr...)
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#define ALT_UP(instr...) instr
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#define ALT_UP_B(label) b label
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#endif
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/*
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* Instruction barrier
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*/
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.macro instr_sync
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#if __LINUX_ARM_ARCH__ >= 7
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isb
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#elif __LINUX_ARM_ARCH__ == 6
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mcr p15, 0, r0, c7, c5, 4
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#endif
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.endm
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/*
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* SMP data memory barrier
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*/
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.macro smp_dmb mode
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#ifdef CONFIG_SMP
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#if __LINUX_ARM_ARCH__ >= 7
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.ifeqs "\mode","arm"
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ALT_SMP(dmb)
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.else
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ALT_SMP(W(dmb))
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.endif
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#elif __LINUX_ARM_ARCH__ == 6
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ALT_SMP(mcr p15, 0, r0, c7, c10, 5) @ dmb
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#else
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#error Incompatible SMP platform
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#endif
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.ifeqs "\mode","arm"
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ALT_UP(nop)
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.else
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ALT_UP(W(nop))
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.endif
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#endif
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.endm
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#if defined(CONFIG_CPU_V7M)
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/*
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* setmode is used to assert to be in svc mode during boot. For v7-M
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* this is done in __v7m_setup, so setmode can be empty here.
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*/
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.macro setmode, mode, reg
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.endm
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#elif defined(CONFIG_THUMB2_KERNEL)
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.macro setmode, mode, reg
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mov \reg, #\mode
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msr cpsr_c, \reg
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.endm
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#else
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.macro setmode, mode, reg
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msr cpsr_c, #\mode
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.endm
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#endif
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/*
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* Helper macro to enter SVC mode cleanly and mask interrupts. reg is
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* a scratch register for the macro to overwrite.
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*
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* This macro is intended for forcing the CPU into SVC mode at boot time.
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* you cannot return to the original mode.
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*/
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.macro safe_svcmode_maskall reg:req
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#if __LINUX_ARM_ARCH__ >= 6
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mrs \reg , cpsr
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eor \reg, \reg, #HYP_MODE
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tst \reg, #MODE_MASK
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bic \reg , \reg , #MODE_MASK
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orr \reg , \reg , #PSR_I_BIT | PSR_F_BIT | SVC_MODE
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THUMB( orr \reg , \reg , #PSR_T_BIT )
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bne 1f
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orr \reg, \reg, #PSR_A_BIT
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adr lr, BSYM(2f)
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msr spsr_cxsf, \reg
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__MSR_ELR_HYP(14)
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__ERET
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1: msr cpsr_c, \reg
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2:
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#else
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/*
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* workaround for possibly broken pre-v6 hardware
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* (akita, Sharp Zaurus C-1000, PXA270-based)
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*/
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setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, \reg
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#endif
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.endm
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/*
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* STRT/LDRT access macros with ARM and Thumb-2 variants
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*/
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#ifdef CONFIG_THUMB2_KERNEL
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.macro usraccoff, instr, reg, ptr, inc, off, cond, abort, t=TUSER()
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9999:
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.if \inc == 1
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\instr\cond\()b\()\t\().w \reg, [\ptr, #\off]
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.elseif \inc == 4
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\instr\cond\()\t\().w \reg, [\ptr, #\off]
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.else
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.error "Unsupported inc macro argument"
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.endif
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.pushsection __ex_table,"a"
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.align 3
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.long 9999b, \abort
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.popsection
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.endm
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.macro usracc, instr, reg, ptr, inc, cond, rept, abort
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@ explicit IT instruction needed because of the label
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@ introduced by the USER macro
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.ifnc \cond,al
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.if \rept == 1
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itt \cond
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.elseif \rept == 2
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ittt \cond
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.else
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.error "Unsupported rept macro argument"
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.endif
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.endif
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@ Slightly optimised to avoid incrementing the pointer twice
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usraccoff \instr, \reg, \ptr, \inc, 0, \cond, \abort
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.if \rept == 2
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usraccoff \instr, \reg, \ptr, \inc, \inc, \cond, \abort
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.endif
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add\cond \ptr, #\rept * \inc
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.endm
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#else /* !CONFIG_THUMB2_KERNEL */
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.macro usracc, instr, reg, ptr, inc, cond, rept, abort, t=TUSER()
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.rept \rept
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9999:
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.if \inc == 1
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\instr\cond\()b\()\t \reg, [\ptr], #\inc
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.elseif \inc == 4
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\instr\cond\()\t \reg, [\ptr], #\inc
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.else
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.error "Unsupported inc macro argument"
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.endif
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.pushsection __ex_table,"a"
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.align 3
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.long 9999b, \abort
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.popsection
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.endr
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.endm
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#endif /* CONFIG_THUMB2_KERNEL */
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.macro strusr, reg, ptr, inc, cond=al, rept=1, abort=9001f
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usracc str, \reg, \ptr, \inc, \cond, \rept, \abort
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.endm
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.macro ldrusr, reg, ptr, inc, cond=al, rept=1, abort=9001f
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usracc ldr, \reg, \ptr, \inc, \cond, \rept, \abort
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.endm
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/* Utility macro for declaring string literals */
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.macro string name:req, string
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.type \name , #object
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\name:
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.asciz "\string"
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.size \name , . - \name
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.endm
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.macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
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#ifndef CONFIG_CPU_USE_DOMAINS
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adds \tmp, \addr, #\size - 1
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sbcccs \tmp, \tmp, \limit
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bcs \bad
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#endif
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.endm
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#endif /* __ASM_ASSEMBLER_H__ */
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