a82e949c00
Avoid using linker magic to define the init, task, and shutdown functions. Instead, use the compile_time_request system. This simplifies the build and produces more efficient code. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
// Definitions for irq enable/disable on ARM Cortex-M processors
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//
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// Copyright (C) 2017 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include "irq.h" // irqstatus_t
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#include "sched.h" // DECL_SHUTDOWN
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void
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irq_disable(void)
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{
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asm volatile("cpsid i" ::: "memory");
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}
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void
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irq_enable(void)
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{
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asm volatile("cpsie i" ::: "memory");
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}
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irqstatus_t
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irq_save(void)
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{
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irqstatus_t flag;
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asm volatile("mrs %0, primask" : "=r" (flag) :: "memory");
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irq_disable();
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return flag;
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}
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void
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irq_restore(irqstatus_t flag)
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{
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asm volatile("msr primask, %0" :: "r" (flag) : "memory");
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}
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void
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irq_poll(void)
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{
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}
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// Clear the active irq if a shutdown happened in an irq handler
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void
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clear_active_irq(void)
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{
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uint32_t psr;
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asm volatile("mrs %0, psr" : "=r" (psr));
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if (!(psr & 0x1ff))
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// Shutdown did not occur in an irq - nothing to do.
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return;
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// Clear active irq status
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psr = 1<<24; // T-bit
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uint32_t temp;
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asm volatile(
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" push { %1 }\n"
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" adr %0, 1f\n"
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" push { %0 }\n"
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" push { r0, r1, r2, r3, r12, lr }\n"
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" bx %2\n"
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"1:\n"
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: "=&r"(temp) : "r"(psr), "r"(0xfffffff9) : "cc");
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}
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DECL_SHUTDOWN(clear_active_irq);
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