| Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame^] | 1 | #ifndef _ASM_CRIS_ARCH_PROCESSOR_H |
| 2 | #define _ASM_CRIS_ARCH_PROCESSOR_H |
| 3 | |
| 4 | #include <linux/config.h> |
| 5 | |
| 6 | /* Return current instruction pointer. */ |
| 7 | #define current_text_addr() \ |
| 8 | ({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;}) |
| 9 | |
| 10 | /* |
| 11 | * Since CRIS doesn't do hardware task-switching this hasn't really anything to |
| 12 | * do with the proccessor itself, it's just here for legacy reasons. This is |
| 13 | * used when task-switching using _resume defined in entry.S. The offsets here |
| 14 | * are hardcoded into _resume, so if this struct is changed, entry.S needs to be |
| 15 | * changed as well. |
| 16 | */ |
| 17 | struct thread_struct { |
| 18 | unsigned long ksp; /* Kernel stack pointer. */ |
| 19 | unsigned long usp; /* User stack pointer. */ |
| 20 | unsigned long ccs; /* Saved flags register. */ |
| 21 | }; |
| 22 | |
| 23 | /* |
| 24 | * User-space process size. This is hardcoded into a few places, so don't |
| 25 | * changed it unless everything's clear! |
| 26 | */ |
| 27 | #ifndef CONFIG_ETRAXFS_SIM |
| 28 | #define TASK_SIZE (0xB0000000UL) |
| 29 | #else |
| 30 | #define TASK_SIZE (0xA0000000UL) |
| 31 | #endif |
| 32 | |
| 33 | /* CCS I=1, enable interrupts. */ |
| 34 | #define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) } |
| 35 | |
| 36 | #define KSTK_EIP(tsk) \ |
| 37 | ({ \ |
| 38 | unsigned long eip = 0; \ |
| 39 | unsigned long regs = (unsigned long)user_regs(tsk); \ |
| 40 | if (regs > PAGE_SIZE && virt_addr_valid(regs)) \ |
| 41 | eip = ((struct pt_regs *)regs)->erp; \ |
| 42 | eip; \ |
| 43 | }) |
| 44 | |
| 45 | /* |
| 46 | * Give the thread a program location, set user-mode and switch user |
| 47 | * stackpointer. |
| 48 | */ |
| 49 | #define start_thread(regs, ip, usp) \ |
| 50 | do { \ |
| 51 | set_fs(USER_DS); \ |
| 52 | regs->erp = ip; \ |
| 53 | regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \ |
| 54 | wrusp(usp); \ |
| 55 | } while(0) |
| 56 | |
| 57 | /* Nothing special to do for v32 when handling a kernel bus fault fixup. */ |
| 58 | #define arch_fixup(regs) {}; |
| 59 | |
| 60 | #endif /* _ASM_CRIS_ARCH_PROCESSOR_H */ |