| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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)user_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 | set_fs(USER_DS); \ |
| 57 | regs->irp = ip; \ |
| 58 | regs->dccr |= 1 << U_DCCR_BITNR; \ |
| 59 | wrusp(usp); \ |
| 60 | } while(0) |
| 61 | |
| 62 | #endif |