2 * Copyright 2004-2009 Analog Devices Inc.
4 * Licensed under the GPL-2 or later.
7 #ifndef __ASM_BFIN_PROCESSOR_H
8 #define __ASM_BFIN_PROCESSOR_H
11 * Default implementation of macro that returns current
12 * instruction pointer ("program counter").
14 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
16 #include <asm/ptrace.h>
17 #include <mach/blackfin.h>
19 static inline unsigned long rdusp(void)
23 __asm__
__volatile__("%0 = usp;\n\t":"=da"(usp
));
27 static inline void wrusp(unsigned long usp
)
29 __asm__
__volatile__("usp = %0;\n\t"::"da"(usp
));
32 static inline unsigned long __get_SP(void)
36 __asm__
__volatile__("%0 = sp;\n\t" : "=da"(sp
));
41 * User space process size: 1st byte beyond user address space.
42 * Fairly meaningless on nommu. Parts of user programs can be scattered
43 * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
45 #define TASK_SIZE 0xFFFFFFFF
48 #define STACK_TOP TASK_SIZE
51 #define TASK_UNMAPPED_BASE 0
53 struct thread_struct
{
54 unsigned long ksp
; /* kernel stack pointer */
55 unsigned long usp
; /* user stack pointer */
56 unsigned short seqstat
; /* saved status register */
57 unsigned long esp0
; /* points to SR of stack frame pt_regs */
58 unsigned long pc
; /* instruction pointer */
62 #define INIT_THREAD { \
63 sizeof(init_stack) + (unsigned long) init_stack, 0, \
67 extern void start_thread(struct pt_regs
*regs
, unsigned long new_ip
,
68 unsigned long new_sp
);
70 /* Forward declaration, a strange C thing */
73 /* Free all resources held by a thread. */
74 static inline void release_thread(struct task_struct
*dead_task
)
78 #define prepare_to_copy(tsk) do { } while (0)
80 extern int kernel_thread(int (*fn
) (void *), void *arg
, unsigned long flags
);
83 * Free current thread data structures etc..
85 static inline void exit_thread(void)
90 * Return saved PC of a blocked thread.
92 #define thread_saved_pc(tsk) (tsk->thread.pc)
94 unsigned long get_wchan(struct task_struct
*p
);
96 #define KSTK_EIP(tsk) \
98 unsigned long eip = 0; \
99 if ((tsk)->thread.esp0 > PAGE_SIZE && \
100 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
101 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
103 #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
105 #define cpu_relax() smp_mb()
108 /* Get the Silicon Revision of the chip */
109 static inline uint32_t __pure
bfin_revid(void)
111 /* Always use CHIPID, to work around ANOMALY_05000234 */
112 uint32_t revid
= (bfin_read_CHIPID() & CHIPID_VERSION
) >> 28;
114 #ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
117 * Incorrect Revision Number in DSPID Register
119 if (ANOMALY_05000364
&&
120 bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI
) == 0x2796)
127 static inline uint16_t __pure
bfin_cpuid(void)
129 return (bfin_read_CHIPID() & CHIPID_FAMILY
) >> 12;
132 static inline uint32_t __pure
bfin_dspid(void)
134 return bfin_read_DSPID();
137 #define blackfin_core_id() (bfin_dspid() & 0xff)
139 static inline uint32_t __pure
bfin_compiled_revid(void)
141 #if defined(CONFIG_BF_REV_0_0)
143 #elif defined(CONFIG_BF_REV_0_1)
145 #elif defined(CONFIG_BF_REV_0_2)
147 #elif defined(CONFIG_BF_REV_0_3)
149 #elif defined(CONFIG_BF_REV_0_4)
151 #elif defined(CONFIG_BF_REV_0_5)
153 #elif defined(CONFIG_BF_REV_0_6)
155 #elif defined(CONFIG_BF_REV_ANY)