Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | #ifndef __ASM_BFIN_PROCESSOR_H |
| 2 | #define __ASM_BFIN_PROCESSOR_H |
| 3 | |
| 4 | /* |
| 5 | * Default implementation of macro that returns current |
| 6 | * instruction pointer ("program counter"). |
| 7 | */ |
| 8 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) |
| 9 | |
| 10 | #include <asm/blackfin.h> |
| 11 | #include <asm/segment.h> |
| 12 | #include <linux/compiler.h> |
| 13 | |
| 14 | static inline unsigned long rdusp(void) |
| 15 | { |
| 16 | unsigned long usp; |
| 17 | |
| 18 | __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp)); |
| 19 | return usp; |
| 20 | } |
| 21 | |
| 22 | static inline void wrusp(unsigned long usp) |
| 23 | { |
| 24 | __asm__ __volatile__("usp = %0;\n\t"::"da"(usp)); |
| 25 | } |
| 26 | |
| 27 | /* |
| 28 | * User space process size: 1st byte beyond user address space. |
| 29 | */ |
| 30 | extern unsigned long memory_end; |
| 31 | #define TASK_SIZE (memory_end) |
| 32 | |
| 33 | #define TASK_UNMAPPED_BASE 0 |
| 34 | |
| 35 | struct thread_struct { |
| 36 | unsigned long ksp; /* kernel stack pointer */ |
| 37 | unsigned long usp; /* user stack pointer */ |
| 38 | unsigned short seqstat; /* saved status register */ |
| 39 | unsigned long esp0; /* points to SR of stack frame pt_regs */ |
| 40 | unsigned long pc; /* instruction pointer */ |
| 41 | void * debuggerinfo; |
| 42 | }; |
| 43 | |
| 44 | #define INIT_THREAD { \ |
| 45 | sizeof(init_stack) + (unsigned long) init_stack, 0, \ |
| 46 | PS_S, 0, 0 \ |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * Do necessary setup to start up a newly executed thread. |
| 51 | * |
| 52 | * pass the data segment into user programs if it exists, |
| 53 | * it can't hurt anything as far as I can tell |
| 54 | */ |
| 55 | #define start_thread(_regs, _pc, _usp) \ |
| 56 | do { \ |
| 57 | set_fs(USER_DS); \ |
| 58 | (_regs)->pc = (_pc); \ |
| 59 | if (current->mm) \ |
| 60 | (_regs)->p5 = current->mm->start_data; \ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 61 | task_thread_info(current)->l1_task_info.stack_start \ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 62 | = (void *)current->mm->context.stack_start; \ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 63 | task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \ |
| 64 | memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 65 | sizeof(*L1_SCRATCH_TASK_INFO)); \ |
| 66 | wrusp(_usp); \ |
| 67 | } while(0) |
| 68 | |
| 69 | /* Forward declaration, a strange C thing */ |
| 70 | struct task_struct; |
| 71 | |
| 72 | /* Free all resources held by a thread. */ |
| 73 | static inline void release_thread(struct task_struct *dead_task) |
| 74 | { |
| 75 | } |
| 76 | |
| 77 | #define prepare_to_copy(tsk) do { } while (0) |
| 78 | |
| 79 | extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags); |
| 80 | |
| 81 | /* |
| 82 | * Free current thread data structures etc.. |
| 83 | */ |
| 84 | static inline void exit_thread(void) |
| 85 | { |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Return saved PC of a blocked thread. |
| 90 | */ |
| 91 | #define thread_saved_pc(tsk) (tsk->thread.pc) |
| 92 | |
| 93 | unsigned long get_wchan(struct task_struct *p); |
| 94 | |
| 95 | #define KSTK_EIP(tsk) \ |
| 96 | ({ \ |
| 97 | unsigned long eip = 0; \ |
| 98 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ |
| 99 | MAP_NR((tsk)->thread.esp0) < max_mapnr) \ |
| 100 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ |
| 101 | eip; }) |
| 102 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) |
| 103 | |
| 104 | #define cpu_relax() barrier() |
| 105 | |
| 106 | /* Get the Silicon Revision of the chip */ |
Mike Frysinger | eb8d5f6 | 2007-05-21 18:09:22 +0800 | [diff] [blame] | 107 | static inline __attribute_pure__ uint32_t bfin_revid(void) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 108 | { |
| 109 | /* stored in the upper 4 bits */ |
| 110 | return bfin_read_CHIPID() >> 28; |
| 111 | } |
| 112 | |
Mike Frysinger | eb8d5f6 | 2007-05-21 18:09:22 +0800 | [diff] [blame] | 113 | static inline __attribute_pure__ uint32_t bfin_compiled_revid(void) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 114 | { |
| 115 | #if defined(CONFIG_BF_REV_0_0) |
| 116 | return 0; |
| 117 | #elif defined(CONFIG_BF_REV_0_1) |
| 118 | return 1; |
| 119 | #elif defined(CONFIG_BF_REV_0_2) |
| 120 | return 2; |
| 121 | #elif defined(CONFIG_BF_REV_0_3) |
| 122 | return 3; |
| 123 | #elif defined(CONFIG_BF_REV_0_4) |
| 124 | return 4; |
| 125 | #elif defined(CONFIG_BF_REV_0_5) |
| 126 | return 5; |
| 127 | #endif |
| 128 | } |
| 129 | |
| 130 | #endif |