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