Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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/blackfin.h>
11#include <asm/segment.h>
12#include <linux/compiler.h>
13
14static 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
22static inline void wrusp(unsigned long usp)
23{
24 __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
25}
26
27static inline unsigned long __get_SP(void)
28{
29 unsigned long sp;
30
31 __asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
32 return sp;
33}
34
35/*
36 * User space process size: 1st byte beyond user address space.
37 * Fairly meaningless on nommu. Parts of user programs can be scattered
38 * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
39 */
40#define TASK_SIZE 0xFFFFFFFF
41
42#ifdef __KERNEL__
43#define STACK_TOP TASK_SIZE
44#endif
45
46#define TASK_UNMAPPED_BASE 0
47
48struct thread_struct {
49 unsigned long ksp; /* kernel stack pointer */
50 unsigned long usp; /* user stack pointer */
51 unsigned short seqstat; /* saved status register */
52 unsigned long esp0; /* points to SR of stack frame pt_regs */
53 unsigned long pc; /* instruction pointer */
54 void * debuggerinfo;
55};
56
57#define INIT_THREAD { \
58 sizeof(init_stack) + (unsigned long) init_stack, 0, \
59 PS_S, 0, 0 \
60}
61
62/*
63 * Do necessary setup to start up a newly executed thread.
64 *
65 * pass the data segment into user programs if it exists,
66 * it can't hurt anything as far as I can tell
67 */
68#ifndef CONFIG_SMP
69#define start_thread(_regs, _pc, _usp) \
70do { \
71 set_fs(USER_DS); \
72 (_regs)->pc = (_pc); \
73 if (current->mm) \
74 (_regs)->p5 = current->mm->start_data; \
75 task_thread_info(current)->l1_task_info.stack_start \
76 = (void *)current->mm->context.stack_start; \
77 task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
78 memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
79 sizeof(*L1_SCRATCH_TASK_INFO)); \
80 wrusp(_usp); \
81} while(0)
82#else
83#define start_thread(_regs, _pc, _usp) \
84do { \
85 set_fs(USER_DS); \
86 (_regs)->pc = (_pc); \
87 if (current->mm) \
88 (_regs)->p5 = current->mm->start_data; \
89 wrusp(_usp); \
90} while (0)
91#endif
92
93/* Forward declaration, a strange C thing */
94struct task_struct;
95
96/* Free all resources held by a thread. */
97static inline void release_thread(struct task_struct *dead_task)
98{
99}
100
101#define prepare_to_copy(tsk) do { } while (0)
102
103extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
104
105/*
106 * Free current thread data structures etc..
107 */
108static inline void exit_thread(void)
109{
110}
111
112/*
113 * Return saved PC of a blocked thread.
114 */
115#define thread_saved_pc(tsk) (tsk->thread.pc)
116
117unsigned long get_wchan(struct task_struct *p);
118
119#define KSTK_EIP(tsk) \
120 ({ \
121 unsigned long eip = 0; \
122 if ((tsk)->thread.esp0 > PAGE_SIZE && \
123 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
124 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
125 eip; })
126#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
127
128#define cpu_relax() smp_mb()
129
130
131/* Get the Silicon Revision of the chip */
132static inline uint32_t __pure bfin_revid(void)
133{
134 /* stored in the upper 4 bits */
135 uint32_t revid = bfin_read_CHIPID() >> 28;
136
137#ifdef CONFIG_BF52x
138 /* ANOMALY_05000357
139 * Incorrect Revision Number in DSPID Register
140 */
141 if (revid == 0)
142 switch (bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI)) {
143 case 0x0010:
144 revid = 0;
145 break;
146 case 0x2796:
147 revid = 1;
148 break;
149 default:
150 revid = 0xFFFF;
151 break;
152 }
153#endif
154 return revid;
155}
156
157static inline uint16_t __pure bfin_cpuid(void)
158{
159 return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
160}
161
162static inline uint32_t __pure bfin_dspid(void)
163{
164 return bfin_read_DSPID();
165}
166
167static inline uint32_t __pure bfin_compiled_revid(void)
168{
169#if defined(CONFIG_BF_REV_0_0)
170 return 0;
171#elif defined(CONFIG_BF_REV_0_1)
172 return 1;
173#elif defined(CONFIG_BF_REV_0_2)
174 return 2;
175#elif defined(CONFIG_BF_REV_0_3)
176 return 3;
177#elif defined(CONFIG_BF_REV_0_4)
178 return 4;
179#elif defined(CONFIG_BF_REV_0_5)
180 return 5;
181#elif defined(CONFIG_BF_REV_0_6)
182 return 6;
183#elif defined(CONFIG_BF_REV_ANY)
184 return 0xffff;
185#else
186 return -1;
187#endif
188}
189
190#endif