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150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/* See the end of this file for copyright, license, and warranty information. */
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#pragma once
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#include <stdint.h>
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#include <toolchain.h>
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typedef uint32_t word_t;
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typedef uint32_t sysarg_t;
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/** Current system frequency in Hertz. */
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extern volatile uint32_t SystemCoreClock;
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/**
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* @brief Hardware context save upon entering kernel space.
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* This is stored on the stack of the thread that ran before exception entry,
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* i.e. PSP if user space and MSP if kernel space.
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*/
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struct hw_context {
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word_t r0;
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word_t r1;
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word_t r2;
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word_t r3;
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word_t r12;
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void *lr; /* alias r14 */
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void *pc; /* alias r15 */
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word_t psr;
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};
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/**
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* @brief Software context save from an exception handler upon entering kernel space.
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* This is always stored on the main stack.
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* The `prepare_entry` macro in `arch/include/asm.S` creates this snapshot.
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*/
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struct exc_context {
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word_t r4;
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word_t r5;
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word_t r6;
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word_t r7;
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word_t r8;
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word_t r9;
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word_t r10;
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word_t r11;
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/*
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* Old stack pointer used before exception entry.
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* Bit 2 in lr defines which stack was used.
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*/
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struct hw_context *sp;
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void *lr;
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};
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/**
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* @brief Used for in-kernel context switching.
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* This is where `do_switch()` stores the register values.
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*/
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struct context {
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word_t r4;
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word_t r5;
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word_t r6;
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word_t r7;
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word_t r8;
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word_t r9;
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word_t r10;
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word_t r11;
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void *sp;
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void *pc;
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};
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/**
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* @brief Task Control Block.
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* This is a low level structure used by `do_switch()` to do the actual context
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* switching, and embedded into `struct task`. We do this nesting because it
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* makes it easier to access the TCB's fields from assembly, and it also makes
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* us less dependent on a specific architecture.
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*/
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struct tcb {
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struct context context;
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/*
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* Needed for exec() because the child task leaves kernel space over a
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* different route than the parent one.
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*/
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struct exc_context *exc_context;
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};
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__always_inline sysarg_t sc_num(const struct exc_context *ctx)
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{
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return ctx->r7;
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}
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__always_inline sysarg_t sc_arg1(const struct exc_context *ctx)
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{
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return ctx->sp->r0;
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}
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__always_inline sysarg_t sc_arg2(const struct exc_context *ctx)
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{
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return ctx->sp->r1;
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}
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__always_inline sysarg_t sc_arg3(const struct exc_context *ctx)
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{
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return ctx->sp->r2;
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}
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__always_inline sysarg_t sc_arg4(const struct exc_context *ctx)
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{
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return ctx->sp->r3;
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}
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__always_inline sysarg_t sc_arg5(const struct exc_context *ctx)
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{
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return ctx->r4;
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}
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__always_inline sysarg_t sc_arg6(const struct exc_context *ctx)
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{
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return ctx->r5;
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}
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__always_inline void sc_set_rval(struct exc_context *ctx, long rval)
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{
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/* raw cast */
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*(long *)&ctx->sp->r0 = rval;
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}
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#ifdef ARDIX_ARCH
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# define __SAM3X8E__
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# define DONT_USE_CMSIS_INIT
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# define __PROGRAM_START
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# include <sam3x8e.h>
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# undef __PROGRAM_START
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# undef DONT_USE_CMSIS_INIT
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# undef __SAM3X8E__
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#endif /* ARDIX_ARCH */
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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