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1394f032 BW |
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. | |
d5adb029 BS |
29 | * Fairly meaningless on nommu. Parts of user programs can be scattered |
30 | * in a lot of places, so just disable this by setting it to 0xFFFFFFFF. | |
1394f032 | 31 | */ |
d5adb029 | 32 | #define TASK_SIZE 0xFFFFFFFF |
1394f032 | 33 | |
922a70d3 DH |
34 | #ifdef __KERNEL__ |
35 | #define STACK_TOP TASK_SIZE | |
36 | #endif | |
37 | ||
1394f032 BW |
38 | #define TASK_UNMAPPED_BASE 0 |
39 | ||
40 | struct thread_struct { | |
41 | unsigned long ksp; /* kernel stack pointer */ | |
42 | unsigned long usp; /* user stack pointer */ | |
43 | unsigned short seqstat; /* saved status register */ | |
44 | unsigned long esp0; /* points to SR of stack frame pt_regs */ | |
45 | unsigned long pc; /* instruction pointer */ | |
46 | void * debuggerinfo; | |
47 | }; | |
48 | ||
49 | #define INIT_THREAD { \ | |
50 | sizeof(init_stack) + (unsigned long) init_stack, 0, \ | |
51 | PS_S, 0, 0 \ | |
52 | } | |
53 | ||
54 | /* | |
55 | * Do necessary setup to start up a newly executed thread. | |
56 | * | |
57 | * pass the data segment into user programs if it exists, | |
58 | * it can't hurt anything as far as I can tell | |
59 | */ | |
60 | #define start_thread(_regs, _pc, _usp) \ | |
61 | do { \ | |
62 | set_fs(USER_DS); \ | |
63 | (_regs)->pc = (_pc); \ | |
64 | if (current->mm) \ | |
65 | (_regs)->p5 = current->mm->start_data; \ | |
f7e4217b | 66 | task_thread_info(current)->l1_task_info.stack_start \ |
1394f032 | 67 | = (void *)current->mm->context.stack_start; \ |
f7e4217b RZ |
68 | task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \ |
69 | memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \ | |
1394f032 BW |
70 | sizeof(*L1_SCRATCH_TASK_INFO)); \ |
71 | wrusp(_usp); \ | |
72 | } while(0) | |
73 | ||
74 | /* Forward declaration, a strange C thing */ | |
75 | struct task_struct; | |
76 | ||
77 | /* Free all resources held by a thread. */ | |
78 | static inline void release_thread(struct task_struct *dead_task) | |
79 | { | |
80 | } | |
81 | ||
82 | #define prepare_to_copy(tsk) do { } while (0) | |
83 | ||
84 | extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags); | |
85 | ||
86 | /* | |
87 | * Free current thread data structures etc.. | |
88 | */ | |
89 | static inline void exit_thread(void) | |
90 | { | |
91 | } | |
92 | ||
93 | /* | |
94 | * Return saved PC of a blocked thread. | |
95 | */ | |
96 | #define thread_saved_pc(tsk) (tsk->thread.pc) | |
97 | ||
98 | unsigned long get_wchan(struct task_struct *p); | |
99 | ||
100 | #define KSTK_EIP(tsk) \ | |
101 | ({ \ | |
102 | unsigned long eip = 0; \ | |
103 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ | |
104 | MAP_NR((tsk)->thread.esp0) < max_mapnr) \ | |
105 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ | |
106 | eip; }) | |
107 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) | |
108 | ||
109 | #define cpu_relax() barrier() | |
110 | ||
111 | /* Get the Silicon Revision of the chip */ | |
e8c44319 | 112 | static inline uint32_t __pure bfin_revid(void) |
1394f032 BW |
113 | { |
114 | /* stored in the upper 4 bits */ | |
115 | return bfin_read_CHIPID() >> 28; | |
116 | } | |
117 | ||
e8c44319 | 118 | static inline uint32_t __pure bfin_compiled_revid(void) |
1394f032 BW |
119 | { |
120 | #if defined(CONFIG_BF_REV_0_0) | |
121 | return 0; | |
122 | #elif defined(CONFIG_BF_REV_0_1) | |
123 | return 1; | |
124 | #elif defined(CONFIG_BF_REV_0_2) | |
125 | return 2; | |
126 | #elif defined(CONFIG_BF_REV_0_3) | |
127 | return 3; | |
128 | #elif defined(CONFIG_BF_REV_0_4) | |
129 | return 4; | |
130 | #elif defined(CONFIG_BF_REV_0_5) | |
131 | return 5; | |
de3025f4 JZ |
132 | #elif defined(CONFIG_BF_REV_ANY) |
133 | return 0xffff; | |
134 | #else | |
135 | return -1; | |
1394f032 BW |
136 | #endif |
137 | } | |
138 | ||
139 | #endif |