diff options
Diffstat (limited to 'arch/blackfin/include/asm/processor.h')
| -rw-r--r-- | arch/blackfin/include/asm/processor.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/processor.h b/arch/blackfin/include/asm/processor.h new file mode 100644 index 00000000000..6f3995b119d --- /dev/null +++ b/arch/blackfin/include/asm/processor.h @@ -0,0 +1,158 @@ +#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 |