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Diffstat (limited to 'misc/Obsoleted/arch/8051/src/up_savecontext.c')
| -rw-r--r-- | misc/Obsoleted/arch/8051/src/up_savecontext.c | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/misc/Obsoleted/arch/8051/src/up_savecontext.c b/misc/Obsoleted/arch/8051/src/up_savecontext.c new file mode 100644 index 000000000..c5d0ae1c7 --- /dev/null +++ b/misc/Obsoleted/arch/8051/src/up_savecontext.c @@ -0,0 +1,362 @@ +/************************************************************************** + * up_savecontext.c + * + * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + **************************************************************************/ + +/************************************************************************** + * Included Files + **************************************************************************/ + +#include <nuttx/config.h> +#include <stdint.h> +#include <nuttx/irq.h> +#include "up_internal.h" + +/************************************************************************** + * Private Definitions + **************************************************************************/ + +/************************************************************************** + * Private Types + **************************************************************************/ + +/************************************************************************** + * Private Function Prototypes + **************************************************************************/ + +/************************************************************************** + * Global Variables + **************************************************************************/ + +/************************************************************************** + * Private Variables + **************************************************************************/ + +/************************************************************************** + * Private Functions + **************************************************************************/ + +/************************************************************************** + * Name: up_savestack + * + * Description: + * Save the entire interrupt stack contents in the provided context + * structure. + * + * Inputs: + * context - the context structure in which to save the stack info + * + * Return: + * None + * + * Assumptions: + * - Interrupts are disabled + * + **************************************************************************/ + +static void up_savestack(FAR struct xcptcontext *context, uint8_t tos) +{ + /* Copy the current stack frame from internal RAM to XRAM. */ + + uint8_t nbytes = tos - (STACK_BASE-1); + NEAR uint8_t *src = (NEAR uint8_t*)STACK_BASE; + FAR uint8_t *dest = context->stack; + + context->nbytes = nbytes; + while (nbytes--) + { + *dest++ = *src++; + } +} + +/************************************************************************** + * Name: up_saveregs + * + * Description: + * Save the interrupt registers into the TCB. + * + * Inputs: + * context - the context structure in which to save the register info + * + * Return: + * None + * + * Assumptions: + * - Interrupts are disabled + * + **************************************************************************/ + +static void up_saveregs(FAR struct xcptcontext *context, uint8_t tos) +{ + /* Copy the irq register save area into the TCB */ + + FAR uint8_t *src = g_irqregs; + FAR uint8_t *dest = context->regs; + uint8_t nbytes = REGS_SIZE; + + while (nbytes--) + { + *dest++ = *src++; + } +} + +/************************************************************************** + * Public Functions + **************************************************************************/ + +/************************************************************************** + * Name: up_saveregisters + * + * Description: + * Save the current registers in the context save area. This function + * is called from up_savecontext (below) and also from interrupt + * handling logic. + * + * Note that this function does not save: + * a, dptr, ie - these are saved in the stack area + * sp - this can be inferred from g_irqtos or struct xcptontext.nbytes. + * + * Inputs: + * regs - the context register array in which to save the register info + * + * Return: + * None + * + **************************************************************************/ + +void up_saveregisters(FAR uint8_t *regs) _naked +{ + _asm + mov a, b + movx @dptr, a + inc dptr + mov a, r2 + movx @dptr, a + inc dptr + mov a, r3 + movx @dptr, a + inc dptr + mov a, r4 + movx @dptr, a + inc dptr + mov a, r5 + movx @dptr, a + inc dptr + mov a, r6 + movx @dptr, a + inc dptr + mov a, r7 + movx @dptr, a + inc dptr + mov a, r0 + movx @dptr, a + inc dptr + mov a, r1 + movx @dptr, a + inc dptr + mov a, psw + movx @dptr, a + clr psw + inc dptr + mov a, _bp + movx @dptr, a + ret + _endasm; +} + +/************************************************************************** + * Name: up_savecontext + * + * Description: + * Push the current execution context onto the stack, then save the + * entire stack contents in the provided context structure. + * + * Inputs: + * context - the context structure in which to save the stack info + * + * Return: + * 0 = Normal state save return + * 1 = This is the matching return from up_restorecontext() + * + **************************************************************************/ + +uint8_t up_savecontext(FAR struct xcptcontext *context) _naked +{ + _asm + /* Create the stack frame that we want when it is time to restore + * this context. The return address will be the return address + * of this function, the return value will be zero. + * + * ... + * return address (2 bytes, already on the stack) + * register a=0 (1 byte) + * register ie (1 byte) + * register dptr (2 bytes) + */ + + clr a + push acc /* ACC = 0 */ + push ie + mov a, #1 + push acc /* DPL = 1 */ + clr a + push acc /* DPH = 0 */ + + /* Dump the stack contents before they are occupied into XRAM */ + +#ifdef CONFIG_SWITCH_FRAME_DUMP + push dpl + push dph + lcall _up_dumpstack + pop dph + pop dpl +#endif + /* Disable interrupts while we create a snapshot of the stack + * and registers. At this point, we have 5 bytes on the stack + * to account for. + */ + + push ie + mov ea, 0 + + /* Save the registers in the context save area */ + + push dpl + push dph + mov a, #XCPT_REGS + add a, dpl + mov dpl, a + clr a + addc a, dph + mov dph, a + lcall _up_saveregisters + pop dph + pop dpl + +#ifdef CONFIG_SWITCH_FRAME_DUMP + /* Save the address of the context structure. We will + * need this later to dump the saved frame. Now we have + * 7 bytes on the stack to account for. + */ + + push dpl + push dph + + /* Push the top of frame stack pointer. We need to + * decrement the current SP value by three to account + * for dptr+IE on the stack above the end of the frame. + */ + + mov a, sp + subb a, #3 +#else + /* Push the top of frame stack pointer. We need to + * decrement the current stack pointer by one to account + * for IE that we saved on the stack. + */ + + mov a, sp + dec a +#endif + push acc + + /* Copy the current stack frame from internal RAM to XRAM. */ + + lcall _up_savestack + pop acc + + /* Dump the contents of the saved frame after it has been + * copied from memory/registers. + */ + +#ifdef CONFIG_SWITCH_FRAME_DUMP + pop dph + pop dpl + push dpl + push dph + lcall _up_dumpframe + pop dph + pop dpl + lcall _up_dumpstack +#endif + + /* Restore the interrupt state */ + + pop ie + + /* Now that we have a snapshot of the desired stack frame saved, + * we can release the stack frame (all but the return address) + */ + + mov a, sp + subb a, #4 + mov sp, a + mov dpl,#0 + ret + _endasm; +} + +/************************************************************************** + * Name: up_saveirqcontext + * + * Description: + * The interrupt context was saved in g_irqtos and g_irqregs when the + * interrupt was taken. If a context switch from the interrupted task + * will be made at the interrupt level, then these saved values must be + * copied into the TCB. + * + * Inputs: + * context - the structure in which to save the context info + * + * Return: + * None + * + * Assumptions: + * - Interrupts are disabled + * + **************************************************************************/ + +void up_saveirqcontext(FAR struct xcptcontext *context) +{ + /* Save the number of bytes in the stack */ + + context->nbytes = g_irqtos - (STACK_BASE-1); + + /* Copy the current stack frame from internal RAM to XRAM. */ + + up_savestack(context, g_irqtos); + + /* Copy the saved registers into the TCB */ + + up_saveregisters(context->regs); +} |