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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | #ifndef __ASM_BFIN_PROCESSOR_H
#define __ASM_BFIN_PROCESSOR_H
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
#include <asm/blackfin.h>
#include <asm/segment.h>
#include <linux/compiler.h>
static inline unsigned long rdusp(void)
{
unsigned long usp;
__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
return usp;
}
static inline void wrusp(unsigned long usp)
{
__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
}
/*
* User space process size: 1st byte beyond user address space.
* Fairly meaningless on nommu. Parts of user programs can be scattered
* in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
*/
#define TASK_SIZE 0xFFFFFFFF
#ifdef __KERNEL__
#define STACK_TOP TASK_SIZE
#endif
#define TASK_UNMAPPED_BASE 0
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long usp; /* user stack pointer */
unsigned short seqstat; /* saved status register */
unsigned long esp0; /* points to SR of stack frame pt_regs */
unsigned long pc; /* instruction pointer */
void * debuggerinfo;
};
#define INIT_THREAD { \
sizeof(init_stack) + (unsigned long) init_stack, 0, \
PS_S, 0, 0 \
}
/*
* Do necessary setup to start up a newly executed thread.
*
* pass the data segment into user programs if it exists,
* it can't hurt anything as far as I can tell
*/
#define start_thread(_regs, _pc, _usp) \
do { \
set_fs(USER_DS); \
(_regs)->pc = (_pc); \
if (current->mm) \
(_regs)->p5 = current->mm->start_data; \
task_thread_info(current)->l1_task_info.stack_start \
= (void *)current->mm->context.stack_start; \
task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
sizeof(*L1_SCRATCH_TASK_INFO)); \
wrusp(_usp); \
} while(0)
/* Forward declaration, a strange C thing */
struct task_struct;
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
#define prepare_to_copy(tsk) do { } while (0)
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
/*
* Free current thread data structures etc..
*/
static inline void exit_thread(void)
{
}
/*
* Return saved PC of a blocked thread.
*/
#define thread_saved_pc(tsk) (tsk->thread.pc)
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) \
({ \
unsigned long eip = 0; \
if ((tsk)->thread.esp0 > PAGE_SIZE && \
MAP_NR((tsk)->thread.esp0) < max_mapnr) \
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
eip; })
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
#define cpu_relax() barrier()
/* Get the Silicon Revision of the chip */
static inline uint32_t __pure bfin_revid(void)
{
/* stored in the upper 4 bits */
uint32_t revid = bfin_read_CHIPID() >> 28;
#ifdef CONFIG_BF52x
/* ANOMALY_05000357
* Incorrect Revision Number in DSPID Register
*/
if (revid == 0)
switch (bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI)) {
case 0x0010:
revid = 0;
break;
case 0x2796:
revid = 1;
break;
default:
revid = 0xFFFF;
break;
}
#endif
return revid;
}
static inline uint32_t __pure bfin_compiled_revid(void)
{
#if defined(CONFIG_BF_REV_0_0)
return 0;
#elif defined(CONFIG_BF_REV_0_1)
return 1;
#elif defined(CONFIG_BF_REV_0_2)
return 2;
#elif defined(CONFIG_BF_REV_0_3)
return 3;
#elif defined(CONFIG_BF_REV_0_4)
return 4;
#elif defined(CONFIG_BF_REV_0_5)
return 5;
#elif defined(CONFIG_BF_REV_ANY)
return 0xffff;
#else
return -1;
#endif
}
#endif
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