1 #ifndef __ASM_CRIS_ARCH_PROCESSOR_H 2 #define __ASM_CRIS_ARCH_PROCESSOR_H 3 4 /* 5 * Default implementation of macro that returns current 6 * instruction pointer ("program counter"). 7 */ 8 #define current_text_addr() ({void *pc; __asm__ ("move.d $pc,%0" : "=rm" (pc)); pc; }) 9 10 /* CRIS has no problems with write protection */ 11 #define wp_works_ok 1 12 13 /* CRIS thread_struct. this really has nothing to do with the processor itself, since 14 * CRIS does not do any hardware task-switching, but it's here for legacy reasons. 15 * The thread_struct here is used when task-switching using _resume defined in entry.S. 16 * The offsets here are hardcoded into _resume - if you change this struct, you need to 17 * change them as well!!! 18 */ 19 20 struct thread_struct { 21 unsigned long ksp; /* kernel stack pointer */ 22 unsigned long usp; /* user stack pointer */ 23 unsigned long dccr; /* saved flag register */ 24 }; 25 26 /* 27 * User space process size. This is hardcoded into a few places, 28 * so don't change it unless you know what you are doing. 29 */ 30 31 #ifdef CONFIG_CRIS_LOW_MAP 32 #define TASK_SIZE (0x50000000UL) /* 1.25 GB */ 33 #else 34 #define TASK_SIZE (0xA0000000UL) /* 2.56 GB */ 35 #endif 36 37 #define INIT_THREAD { \ 38 0, 0, 0x20 } /* ccr = int enable, nothing else */ 39 40 #define KSTK_EIP(tsk) \ 41 ({ \ 42 unsigned long eip = 0; \ 43 unsigned long regs = (unsigned long)task_pt_regs(tsk); \ 44 if (regs > PAGE_SIZE && \ 45 virt_addr_valid(regs)) \ 46 eip = ((struct pt_regs *)regs)->irp; \ 47 eip; \ 48 }) 49 50 /* give the thread a program location 51 * set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8) 52 * switch user-stackpointer 53 */ 54 55 #define start_thread(regs, ip, usp) do { \ 56 regs->irp = ip; \ 57 regs->dccr |= 1 << U_DCCR_BITNR; \ 58 wrusp(usp); \ 59 } while(0) 60 61 /* Called when handling a kernel bus fault fixup. 62 * 63 * After a fixup we do not want to return by restoring the CPU-state 64 * anymore, so switch frame-types (see ptrace.h) 65 */ 66 #define arch_fixup(regs) \ 67 regs->frametype = CRIS_FRAME_NORMAL; 68 69 #endif 70