| /* | |
| * 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> | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| */ | |
| #ifndef _ASM_C6X_PROCESSOR_H | |
| #define _ASM_C6X_PROCESSOR_H | |
| #include <asm/ptrace.h> | |
| #include <asm/page.h> | |
| #include <asm/current.h> | |
| /* | |
| * Default implementation of macro that returns current | |
| * instruction pointer ("program counter"). | |
| */ | |
| #define current_text_addr() \ | |
| ({ \ | |
| void *__pc; \ | |
| asm("mvc .S2 pce1,%0\n" : "=b"(__pc)); \ | |
| __pc; \ | |
| }) | |
| /* | |
| * 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 */ |