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114 lines
2.9 KiB
114 lines
2.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Port on Texas Instruments TMS320C6x architecture |
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* |
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* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated |
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* Author: Aurelien Jacquiot ([email protected]) |
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* |
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* Updated for 2.6.34: Mark Salter <[email protected]> |
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*/ |
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#ifndef _ASM_C6X_PROCESSOR_H |
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#define _ASM_C6X_PROCESSOR_H |
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#include <asm/ptrace.h> |
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#include <asm/page.h> |
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#include <asm/current.h> |
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/* |
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* User space process size. This is mostly meaningless for NOMMU |
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* but some C6X processors may have RAM addresses up to 0xFFFFFFFF. |
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* Since calls like mmap() can return an address or an error, we |
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* have to allow room for error returns when code does something |
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* like: |
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* |
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* addr = do_mmap(...) |
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* if ((unsigned long)addr >= TASK_SIZE) |
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* ... its an error code, not an address ... |
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* |
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* Here, we allow for 4096 error codes which means we really can't |
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* use the last 4K page on systems with RAM extending all the way |
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* to the end of the 32-bit address space. |
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*/ |
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#define TASK_SIZE 0xFFFFF000 |
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/* |
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* This decides where the kernel will search for a free chunk of vm |
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* space during mmap's. We won't be using it |
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*/ |
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#define TASK_UNMAPPED_BASE 0 |
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struct thread_struct { |
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unsigned long long b15_14; |
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unsigned long long a15_14; |
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unsigned long long b13_12; |
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unsigned long long a13_12; |
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unsigned long long b11_10; |
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unsigned long long a11_10; |
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unsigned long long ricl_icl; |
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unsigned long usp; /* user stack pointer */ |
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unsigned long pc; /* kernel pc */ |
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unsigned long wchan; |
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}; |
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#define INIT_THREAD \ |
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{ \ |
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.usp = 0, \ |
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.wchan = 0, \ |
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} |
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#define INIT_MMAP { \ |
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&init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \ |
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NULL, NULL } |
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#define task_pt_regs(task) \ |
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((struct pt_regs *)(THREAD_START_SP + task_stack_page(task)) - 1) |
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#define alloc_kernel_stack() __get_free_page(GFP_KERNEL) |
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#define free_kernel_stack(page) free_page((page)) |
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/* Forward declaration, a strange C thing */ |
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struct task_struct; |
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extern void start_thread(struct pt_regs *regs, unsigned int pc, |
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unsigned long usp); |
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/* Free all resources held by a thread. */ |
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static inline void release_thread(struct task_struct *dead_task) |
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{ |
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} |
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/* |
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* saved kernel SP and DP of a blocked thread. |
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*/ |
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#ifdef _BIG_ENDIAN |
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#define thread_saved_ksp(tsk) \ |
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(*(unsigned long *)&(tsk)->thread.b15_14) |
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#define thread_saved_dp(tsk) \ |
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(*(((unsigned long *)&(tsk)->thread.b15_14) + 1)) |
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#else |
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#define thread_saved_ksp(tsk) \ |
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(*(((unsigned long *)&(tsk)->thread.b15_14) + 1)) |
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#define thread_saved_dp(tsk) \ |
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(*(unsigned long *)&(tsk)->thread.b15_14) |
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#endif |
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extern unsigned long get_wchan(struct task_struct *p); |
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#define KSTK_EIP(task) (task_pt_regs(task)->pc) |
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#define KSTK_ESP(task) (task_pt_regs(task)->sp) |
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#define cpu_relax() do { } while (0) |
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extern const struct seq_operations cpuinfo_op; |
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/* Reset the board */ |
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#define HARD_RESET_NOW() |
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extern unsigned int c6x_core_freq; |
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extern void (*c6x_restart)(void); |
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extern void (*c6x_halt)(void); |
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#endif /* ASM_C6X_PROCESSOR_H */
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