#ifndef __ASM_ARM_SYSTEM_H #define __ASM_ARM_SYSTEM_H #ifdef __KERNEL__ #include <linux/config.h> #define CPU_ARCH_UNKNOWN 0 #define CPU_ARCH_ARMv3 1 #define CPU_ARCH_ARMv4 2 #define CPU_ARCH_ARMv4T 3 #define CPU_ARCH_ARMv5 4 #define CPU_ARCH_ARMv5T 5 #define CPU_ARCH_ARMv5TE 6 #define CPU_ARCH_ARMv5TEJ 7 #define CPU_ARCH_ARMv6 8 /* * CR1 bits (CP#15 CR1) */ #define CR_M (1 << 0) /* MMU enable */ #define CR_A (1 << 1) /* Alignment abort enable */ #define CR_C (1 << 2) /* Dcache enable */ #define CR_W (1 << 3) /* Write buffer enable */ #define CR_P (1 << 4) /* 32-bit exception handler */ #define CR_D (1 << 5) /* 32-bit data address range */ #define CR_L (1 << 6) /* Implementation defined */ #define CR_B (1 << 7) /* Big endian */ #define CR_S (1 << 8) /* System MMU protection */ #define CR_R (1 << 9) /* ROM MMU protection */ #define CR_F (1 << 10) /* Implementation defined */ #define CR_Z (1 << 11) /* Implementation defined */ #define CR_I (1 << 12) /* Icache enable */ #define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */ #define CR_RR (1 << 14) /* Round Robin cache replacement */ #define CR_L4 (1 << 15) /* LDR pc can set T bit */ #define CR_DT (1 << 16) #define CR_IT (1 << 18) #define CR_ST (1 << 19) #define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */ #define CR_U (1 << 22) /* Unaligned access operation */ #define CR_XP (1 << 23) /* Extended page tables */ #define CR_VE (1 << 24) /* Vectored interrupts */ #define CPUID_ID 0 #define CPUID_CACHETYPE 1 #define CPUID_TCM 2 #define CPUID_TLBTYPE 3 #define read_cpuid(reg) \ ({ \ unsigned int __val; \ asm("mrc p15, 0, %0, c0, c0, " __stringify(reg) \ : "=r" (__val) \ : \ : "cc"); \ __val; \ }) /* * This is used to ensure the compiler did actually allocate the register we * asked it for some inline assembly sequences. Apparently we can't trust * the compiler from one version to another so a bit of paranoia won't hurt. * This string is meant to be concatenated with the inline asm string and * will cause compilation to stop on mismatch. * (for details, see gcc PR 15089) */ #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t" #ifndef __ASSEMBLY__ #include <linux/linkage.h> struct thread_info; struct task_struct; /* information about the system we're running on */ extern unsigned int system_rev; extern unsigned int system_serial_low; extern unsigned int system_serial_high; extern unsigned int mem_fclk_21285; struct pt_regs; void die(const char *msg, struct pt_regs *regs, int err) __attribute__((noreturn)); struct siginfo; void notify_die(const char *str, struct pt_regs *regs, struct siginfo *info, unsigned long err, unsigned long trap); void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), int sig, const char *name); #define xchg(ptr,x) \ ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) #define tas(ptr) (xchg((ptr),1)) extern asmlinkage void __backtrace(void); extern asmlinkage void c_backtrace(unsigned long fp, int pmode); struct mm_struct; extern void show_pte(struct mm_struct *mm, unsigned long addr); extern void __show_regs(struct pt_regs *); extern int cpu_architecture(void); extern void cpu_init(void); /* * Intel's XScale3 core supports some v6 features (supersections, L2) * but advertises itself as v5 as it does not support the v6 ISA. For * this reason, we need a way to explicitly test for this type of CPU. */ #ifndef CONFIG_CPU_XSC3 #define cpu_is_xsc3() 0 #else static inline int cpu_is_xsc3(void) { extern unsigned int processor_id; if ((processor_id & 0xffffe000) == 0x69056000) return 1; return 0; } #endif #define set_cr(x) \ __asm__ __volatile__( \ "mcr p15, 0, %0, c1, c0, 0 @ set CR" \ : : "r" (x) : "cc") #define get_cr() \ ({ \ unsigned int __val; \ __asm__ __volatile__( \ "mrc p15, 0, %0, c1, c0, 0 @ get CR" \ : "=r" (__val) : : "cc"); \ __val; \ }) extern unsigned long cr_no_alignment; /* defined in entry-armv.S */ extern unsigned long cr_alignment; /* defined in entry-armv.S */ #define UDBG_UNDEFINED (1 << 0) #define UDBG_SYSCALL (1 << 1) #define UDBG_BADABORT (1 << 2) #define UDBG_SEGV (1 << 3) #define UDBG_BUS (1 << 4) extern unsigned int user_debug; #if __LINUX_ARM_ARCH__ >= 4 #define vectors_high() (cr_alignment & CR_V) #else #define vectors_high() (0) #endif #if __LINUX_ARM_ARCH__ >= 6 #define mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \ : : "r" (0) : "memory") #else #define mb() __asm__ __volatile__ ("" : : : "memory") #endif #define rmb() mb() #define wmb() mb() #define read_barrier_depends() do { } while(0) #define set_mb(var, value) do { var = value; mb(); } while (0) #define set_wmb(var, value) do { var = value; wmb(); } while (0) #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t"); /* * switch_mm() may do a full cache flush over the context switch, * so enable interrupts over the context switch to avoid high * latency. */ #define __ARCH_WANT_INTERRUPTS_ON_CTXSW /* * switch_to(prev, next) should switch from task `prev' to `next' * `prev' will never be the same as `next'. schedule() itself * contains the memory barrier to tell GCC not to cache `current'. */ extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *); #define switch_to(prev,next,last) \ do { \ last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ } while (0) /* * On SMP systems, when the scheduler does migration-cost autodetection, * it needs a way to flush as much of the CPU's caches as possible. * * TODO: fill this in! */ static inline void sched_cacheflush(void) { } /* * CPU interrupt mask handling. */ #if __LINUX_ARM_ARCH__ >= 6 #define local_irq_save(x) \ ({ \ __asm__ __volatile__( \ "mrs %0, cpsr @ local_irq_save\n" \ "cpsid i" \ : "=r" (x) : : "memory", "cc"); \ }) #define local_irq_enable() __asm__("cpsie i @ __sti" : : : "memory", "cc") #define local_irq_disable() __asm__("cpsid i @ __cli" : : : "memory", "cc") #define local_fiq_enable() __asm__("cpsie f @ __stf" : : : "memory", "cc") #define local_fiq_disable() __asm__("cpsid f @ __clf" : : : "memory", "cc") #else /* * Save the current interrupt enable state & disable IRQs */ #define local_irq_save(x) \ ({ \ unsigned long temp; \ (void) (&temp == &x); \ __asm__ __volatile__( \ "mrs %0, cpsr @ local_irq_save\n" \ " orr %1, %0, #128\n" \ " msr cpsr_c, %1" \ : "=r" (x), "=r" (temp) \ : \ : "memory", "cc"); \ }) /* * Enable IRQs */ #define local_irq_enable() \ ({ \ unsigned long temp; \ __asm__ __volatile__( \ "mrs %0, cpsr @ local_irq_enable\n" \ " bic %0, %0, #128\n" \ " msr cpsr_c, %0" \ : "=r" (temp) \ : \ : "memory", "cc"); \ }) /* * Disable IRQs */ #define local_irq_disable() \ ({ \ unsigned long temp; \ __asm__ __volatile__( \ "mrs %0, cpsr @ local_irq_disable\n" \ " orr %0, %0, #128\n" \ " msr cpsr_c, %0" \ : "=r" (temp) \ : \ : "memory", "cc"); \ }) /* * Enable FIQs */ #define local_fiq_enable() \ ({ \ unsigned long temp; \ __asm__ __volatile__( \ "mrs %0, cpsr @ stf\n" \ " bic %0, %0, #64\n" \ " msr cpsr_c, %0" \ : "=r" (temp) \ : \ : "memory", "cc"); \ }) /* * Disable FIQs */ #define local_fiq_disable() \ ({ \ unsigned long temp; \ __asm__ __volatile__( \ "mrs %0, cpsr @ clf\n" \ " orr %0, %0, #64\n" \ " msr cpsr_c, %0" \ : "=r" (temp) \ : \ : "memory", "cc"); \ }) #endif /* * Save the current interrupt enable state. */ #define local_save_flags(x) \ ({ \ __asm__ __volatile__( \ "mrs %0, cpsr @ local_save_flags" \ : "=r" (x) : : "memory", "cc"); \ }) /* * restore saved IRQ & FIQ state */ #define local_irq_restore(x) \ __asm__ __volatile__( \ "msr cpsr_c, %0 @ local_irq_restore\n" \ : \ : "r" (x) \ : "memory", "cc") #define irqs_disabled() \ ({ \ unsigned long flags; \ local_save_flags(flags); \ (int)(flags & PSR_I_BIT); \ }) #ifdef CONFIG_SMP #define smp_mb() mb() #define smp_rmb() rmb() #define smp_wmb() wmb() #define smp_read_barrier_depends() read_barrier_depends() #else #define smp_mb() barrier() #define smp_rmb() barrier() #define smp_wmb() barrier() #define smp_read_barrier_depends() do { } while(0) #endif /* CONFIG_SMP */ #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110) /* * On the StrongARM, "swp" is terminally broken since it bypasses the * cache totally. This means that the cache becomes inconsistent, and, * since we use normal loads/stores as well, this is really bad. * Typically, this causes oopsen in filp_close, but could have other, * more disasterous effects. There are two work-arounds: * 1. Disable interrupts and emulate the atomic swap * 2. Clean the cache, perform atomic swap, flush the cache * * We choose (1) since its the "easiest" to achieve here and is not * dependent on the processor type. * * NOTE that this solution won't work on an SMP system, so explcitly * forbid it here. */ #define swp_is_buggy #endif static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size) { extern void __bad_xchg(volatile void *, int); unsigned long ret; #ifdef swp_is_buggy unsigned long flags; #endif #if __LINUX_ARM_ARCH__ >= 6 unsigned int tmp; #endif switch (size) { #if __LINUX_ARM_ARCH__ >= 6 case 1: asm volatile("@ __xchg1\n" "1: ldrexb %0, [%3]\n" " strexb %1, %2, [%3]\n" " teq %1, #0\n" " bne 1b" : "=&r" (ret), "=&r" (tmp) : "r" (x), "r" (ptr) : "memory", "cc"); break; case 4: asm volatile("@ __xchg4\n" "1: ldrex %0, [%3]\n" " strex %1, %2, [%3]\n" " teq %1, #0\n" " bne 1b" : "=&r" (ret), "=&r" (tmp) : "r" (x), "r" (ptr) : "memory", "cc"); break; #elif defined(swp_is_buggy) #ifdef CONFIG_SMP #error SMP is not supported on this platform #endif case 1: local_irq_save(flags); ret = *(volatile unsigned char *)ptr; *(volatile unsigned char *)ptr = x; local_irq_restore(flags); break; case 4: local_irq_save(flags); ret = *(volatile unsigned long *)ptr; *(volatile unsigned long *)ptr = x; local_irq_restore(flags); break; #else case 1: asm volatile("@ __xchg1\n" " swpb %0, %1, [%2]" : "=&r" (ret) : "r" (x), "r" (ptr) : "memory", "cc"); break; case 4: asm volatile("@ __xchg4\n" " swp %0, %1, [%2]" : "=&r" (ret) : "r" (x), "r" (ptr) : "memory", "cc"); break; #endif default: __bad_xchg(ptr, size), ret = 0; break; } return ret; } extern void disable_hlt(void); extern void enable_hlt(void); #endif /* __ASSEMBLY__ */ #define arch_align_stack(x) (x) #endif /* __KERNEL__ */ #endif