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https://github.com/drasko/codezero.git
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a82cdd3456
Added routines that check whether a user pointer is accessible by the kernel, and if not ask the pager to map-in those pages. I haven't implemented yet the bit that asks the pager for paging-in.
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* Definitions for exception support on ARM
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __ARCH_EXCEPTIONS_H__
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#define __ARCH_EXCEPTIONS_H__
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#include INC_ARCH(asm.h)
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static inline void enable_irqs()
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{
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__asm__ __volatile__(
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"mrs r0, cpsr_fc\n"
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"bic r0, r0, #0x80\n" /* ARM_IRQ_BIT */
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"msr cpsr_fc, r0\n"
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);
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}
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static inline int irqs_enabled()
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{
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register unsigned int enabled asm("r1");
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__asm__ __volatile__(
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"mrs r0, cpsr_fc\n"
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"tst r0, #0x80\n" /* ARM_IRQ_BIT. See asm.h for TST inst. */
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"moveq r1, #1\n"
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"movne r1, #0\n"
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);
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return enabled;
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}
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static inline void disable_irqs()
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{
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__asm__ __volatile__(
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"mrs r0, cpsr_fc\n"
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"orr r0, r0, #0x80\n" /* ARM_IRQ_BIT */
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"msr cpsr_fc, r0\n"
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);
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}
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#if 0 /* These will be useful for nested irq disable/enable calls */
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/* Disable the irqs unconditionally, but also keep the previous state such that
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* if it was already disabled before the call, the restore call would retain
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* this state. */
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static inline void irq_local_disable_save(unsigned long *flags)
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{
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unsigned long temp;
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__asm__ __volatile__ (
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"mrs %0, cpsr_fc\n"
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"orr %1, %0, #0x80\n"
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"msr cpsr_fc, %1\n"
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: "=r"(*flags), "=r" (temp)
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);
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}
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/* Simply change it back to original state supplied in @flags. This might enable
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* or retain disabled state of the irqs for example. Useful for nested calls. */
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static inline void irq_local_restore(unsigned long flags)
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{
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__asm__ __volatile__ (
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"msr cpsr_fc, %0\n"
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: "r" (flags)
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);
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}
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#endif
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static inline void irq_local_enable()
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{
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enable_irqs();
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}
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static inline void irq_local_disable()
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{
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disable_irqs();
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}
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/* This is filled on entry to irq handler, only if a process was interrupted.*/
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extern unsigned int preempted_psr;
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static inline int in_kernel()
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{
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return (((preempted_psr & ARM_MODE_MASK) == ARM_MODE_SVC)) ? 1 : 0;
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}
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static inline int in_user()
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{
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return !in_kernel();
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}
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int pager_pagein_request(unsigned long vaddr, unsigned long size,
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unsigned int flags);
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#endif
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