127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/*
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifdef CONFIG_INIT_STACKS
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#include <string.h>
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#endif /* CONFIG_INIT_STACKS */
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#ifdef CONFIG_DEBUG
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#include <misc/printk.h>
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#endif
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#include <kernel_structs.h>
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#include <wait_q.h>
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#include <xtensa_config.h>
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#include <kernel_internal.h>
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extern void _xt_user_exit(void);
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/*
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* @brief Initialize a new thread
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*
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* Any coprocessor context data is put at the lower address of the stack. An
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* initial context, to be "restored" by __return_from_coop(), is put at
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* the other end of the stack, and thus reusable by the stack when not
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* needed anymore.
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*
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* The initial context is a basic stack frame that contains arguments for
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* _thread_entry() return address, that points at _thread_entry()
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* and status register.
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*
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* <options> is currently unused.
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*
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* @param thread pointer to k_thread memory
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* @param pStackmem the pointer to aligned stack memory
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* @param stackSize the stack size in bytes
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* @param pEntry thread entry point routine
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* @param p1 first param to entry point
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* @param p2 second param to entry point
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* @param p3 third param to entry point
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* @param priority thread priority
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* @param options is unused (saved for future expansion)
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*
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* @return N/A
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*/
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void _new_thread(struct k_thread *thread, k_thread_stack_t *stack,
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size_t stackSize, k_thread_entry_t pEntry,
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void *p1, void *p2, void *p3,
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int priority, unsigned int options)
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{
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char *pStack = K_THREAD_STACK_BUFFER(stack);
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/* Align stack end to maximum alignment requirement. */
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char *stackEnd = (char *)ROUND_DOWN(pStack + stackSize, 16);
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#if XCHAL_CP_NUM > 0
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u32_t *cpSA;
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char *cpStack;
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#endif
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_new_thread_init(thread, pStack, stackSize, priority, options);
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#ifdef CONFIG_DEBUG
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printk("\nstackPtr = %p, stackSize = %d\n", pStack, stackSize);
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printk("stackEnd = %p\n", stackEnd);
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#endif
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#if XCHAL_CP_NUM > 0
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/* Ensure CP state descriptor is correctly initialized */
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cpStack = thread->arch.preempCoprocReg.cpStack; /* short hand alias */
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/* Set to zero to avoid bad surprises */
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(void)memset(cpStack, 0, XT_CP_ASA);
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/* Coprocessor's stack is allocated just after the k_thread */
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cpSA = (u32_t *)(thread->arch.preempCoprocReg.cpStack + XT_CP_ASA);
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/* Coprocessor's save area alignment is at leat 16 bytes */
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*cpSA = ROUND_UP(cpSA + 1,
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(XCHAL_TOTAL_SA_ALIGN < 16 ? 16 : XCHAL_TOTAL_SA_ALIGN));
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#ifdef CONFIG_DEBUG
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printk("cpStack = %p\n", thread->arch.preempCoprocReg.cpStack);
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printk("cpAsa = %p\n",
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*(void **)(thread->arch.preempCoprocReg.cpStack + XT_CP_ASA));
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#endif
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#endif
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/* Thread's first frame alignment is granted as both operands are
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* aligned
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*/
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XtExcFrame *pInitCtx =
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(XtExcFrame *)(stackEnd - (XT_XTRA_SIZE - XT_CP_SIZE));
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#ifdef CONFIG_DEBUG
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printk("pInitCtx = %p\n", pInitCtx);
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#endif
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/* Explicitly initialize certain saved registers */
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/* task entrypoint */
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pInitCtx->pc = (u32_t)_thread_entry;
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/* physical top of stack frame */
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pInitCtx->a1 = (u32_t)pInitCtx + XT_STK_FRMSZ;
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/* user exception exit dispatcher */
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pInitCtx->exit = (u32_t)_xt_user_exit;
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/* Set initial PS to int level 0, EXCM disabled, user mode.
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* Also set entry point argument arg.
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*/
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#ifdef __XTENSA_CALL0_ABI__
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pInitCtx->a2 = (u32_t)pEntry;
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pInitCtx->a3 = (u32_t)p1;
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pInitCtx->a4 = (u32_t)p2;
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pInitCtx->a5 = (u32_t)p3;
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pInitCtx->ps = PS_UM | PS_EXCM;
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#else
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/* For windowed ABI set also WOE and CALLINC
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* (pretend task is 'call4')
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*/
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pInitCtx->a6 = (u32_t)pEntry;
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pInitCtx->a7 = (u32_t)p1;
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pInitCtx->a8 = (u32_t)p2;
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pInitCtx->a9 = (u32_t)p3;
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pInitCtx->ps = PS_UM | PS_EXCM | PS_WOE | PS_CALLINC(1);
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#endif
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thread->callee_saved.topOfStack = pInitCtx;
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thread->arch.flags = 0;
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/* initial values in all other registers/k_thread entries are
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* irrelevant
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*/
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}
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