Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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/ptrace.h>
11#include <asm/blackfin.h>
12
13static inline unsigned long rdusp(void)
14{
15 unsigned long usp;
16
17 __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
18 return usp;
19}
20
21static inline void wrusp(unsigned long usp)
22{
23 __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
24}
25
26static inline unsigned long __get_SP(void)
27{
28 unsigned long sp;
29
30 __asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
31 return sp;
32}
33
34/*
35 * User space process size: 1st byte beyond user address space.
36 * Fairly meaningless on nommu. Parts of user programs can be scattered
37 * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
38 */
39#define TASK_SIZE 0xFFFFFFFF
40
41#ifdef __KERNEL__
42#define STACK_TOP TASK_SIZE
43#endif
44
45#define TASK_UNMAPPED_BASE 0
46
47struct thread_struct {
48 unsigned long ksp; /* kernel stack pointer */
49 unsigned long usp; /* user stack pointer */
50 unsigned short seqstat; /* saved status register */
51 unsigned long esp0; /* points to SR of stack frame pt_regs */
52 unsigned long pc; /* instruction pointer */
53 void * debuggerinfo;
54};
55
56#define INIT_THREAD { \
57 sizeof(init_stack) + (unsigned long) init_stack, 0, \
58 PS_S, 0, 0 \
59}
60
61extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
62 unsigned long new_sp);
63
64/* Forward declaration, a strange C thing */
65struct task_struct;
66
67/* Free all resources held by a thread. */
68static inline void release_thread(struct task_struct *dead_task)
69{
70}
71
72#define prepare_to_copy(tsk) do { } while (0)
73
74extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
75
76/*
77 * Free current thread data structures etc..
78 */
79static inline void exit_thread(void)
80{
81}
82
83/*
84 * Return saved PC of a blocked thread.
85 */
86#define thread_saved_pc(tsk) (tsk->thread.pc)
87
88unsigned long get_wchan(struct task_struct *p);
89
90#define KSTK_EIP(tsk) \
91 ({ \
92 unsigned long eip = 0; \
93 if ((tsk)->thread.esp0 > PAGE_SIZE && \
94 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
95 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
96 eip; })
97#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
98
99#define cpu_relax() smp_mb()
100
101
102/* Get the Silicon Revision of the chip */
103static inline uint32_t __pure bfin_revid(void)
104{
105 /* Always use CHIPID, to work around ANOMALY_05000234 */
106 uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;
107
108#ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
109 /*
110 * ANOMALY_05000364
111 * Incorrect Revision Number in DSPID Register
112 */
113 if (ANOMALY_05000364 &&
114 bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796)
115 revid = 1;
116#endif
117
118 return revid;
119}
120
121static inline uint16_t __pure bfin_cpuid(void)
122{
123 return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
124}
125
126static inline uint32_t __pure bfin_dspid(void)
127{
128 return bfin_read_DSPID();
129}
130
131static inline uint32_t __pure bfin_compiled_revid(void)
132{
133#if defined(CONFIG_BF_REV_0_0)
134 return 0;
135#elif defined(CONFIG_BF_REV_0_1)
136 return 1;
137#elif defined(CONFIG_BF_REV_0_2)
138 return 2;
139#elif defined(CONFIG_BF_REV_0_3)
140 return 3;
141#elif defined(CONFIG_BF_REV_0_4)
142 return 4;
143#elif defined(CONFIG_BF_REV_0_5)
144 return 5;
145#elif defined(CONFIG_BF_REV_0_6)
146 return 6;
147#elif defined(CONFIG_BF_REV_ANY)
148 return 0xffff;
149#else
150 return -1;
151#endif
152}
153
154#endif