/* * U-boot - processor.h * * Copyright (c) 2005 blackfin.uclinux.org * * This file is based on * include/asm-m68k/processor.h * Changes made by Akbar Hussain Lineo, Inc, May 2001 for BLACKFIN * Copyright (C) 1995 Hamish Macdonald * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #ifndef __ASM_BLACKFIN_PROCESSOR_H #define __ASM_BLACKFIN_PROCESSOR_H /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ __label__ _l; _l: &&_l;}) #include #include #include #include extern inline unsigned long rdusp(void) { unsigned long usp; __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp)); return usp; } extern inline void wrusp(unsigned long usp) { __asm__ __volatile__("usp = %0;\n\t"::"da"(usp)); } /* * User space process size: 3.75GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing. */ #define TASK_SIZE (0xF0000000UL) /* * Bus types */ #define EISA_bus 0 #define MCA_bus 0 /* There is no pc register avaliable for BLACKFIN, so we are going to get * it indirectly */ #if 0 inline unsigned long obtain_pc_indirectly(void) { unsigned long pc; __asm__ __volatile__("%0 = rets;\n":"=d"(pc)); return (pc - 4); /* call pcrel24 is 4 bytes long */ } #endif /* * if you change this structure, you must change the code and offsets * in m68k/machasm.S */ struct thread_struct { unsigned long ksp; /* kernel stack pointer */ unsigned long usp; /* user stack pointer */ unsigned short seqstat; /* saved status register */ unsigned long esp0; /* points to SR of stack frame pt_regs */ unsigned long pc; /* instruction pointer */ }; #define INIT_MMAP { &init_mm, 0, 0x40000000, NULL, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } #define INIT_THREAD { \ sizeof(init_stack) + (unsigned long) init_stack, 0, \ PS_S, 0\ } /* * Do necessary setup to start up a newly executed thread. * * pass the data segment into user programs if it exists, * it can't hurt anything as far as I can tell */ #define start_thread(_regs, _pc, _usp) \ do { \ set_fs(USER_DS); /* reads from user space */ \ (_regs)->pc = (_pc); \ if (current->mm) \ (_regs)->r5 = current->mm->start_data; \ (_regs)->seqstat &= ~0x0c00; \ wrusp(_usp); \ /* Adde by HuTao, May 26, 2003 3:39PM */\ if ((_regs)->ipend & 0x8000) /* check whether system in supper mode - StChen */\ (_regs)->ipend = 0x0;\ } while(0) /* Forward declaration, a strange C thing */ struct task_struct; /* Free all resources held by a thread. */ static inline void release_thread(struct task_struct *dead_task) { } extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags); #define copy_segments(tsk, mm) do { } while (0) #define release_segments(mm) do { } while (0) #define forget_segments() do { } while (0) /* * Free current thread data structures etc.. */ static inline void exit_thread(void) { } /* * Return saved PC of a blocked thread. */ extern inline unsigned long thread_saved_pc(struct thread_struct *t) { extern void scheduling_functions_start_here(void); extern void scheduling_functions_end_here(void); return 0; } unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk) \ ({ \ unsigned long eip = 0; \ if ((tsk)->thread.esp0 > PAGE_SIZE && \ MAP_NR((tsk)->thread.esp0) < max_mapnr) \ eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ eip; }) #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) #define THREAD_SIZE (2*PAGE_SIZE) /* Allocation and freeing of basic task resources. */ #define alloc_task_struct() \ ((struct task_struct *) __get_free_pages(GFP_KERNEL,1)) #define free_task_struct(p) free_pages((unsigned long)(p),1) #define get_task_struct(tsk) atomic_inc(&mem_map[MAP_NR(tsk)].count) #define init_task (init_task_union.task) #define init_stack (init_task_union.stack) #endif
