| #ifndef _ASM_M32R_SYSTEM_H |
| #define _ASM_M32R_SYSTEM_H |
| |
| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2001 by Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto |
| * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> |
| */ |
| |
| #include <linux/config.h> |
| #include <asm/assembler.h> |
| |
| #ifdef __KERNEL__ |
| |
| /* |
| * switch_to(prev, next) should switch from task `prev' to `next' |
| * `prev' will never be the same as `next'. |
| * |
| * `next' and `prev' should be struct task_struct, but it isn't always defined |
| */ |
| |
| #ifndef CONFIG_SMP |
| #define prepare_to_switch() do { } while(0) |
| #endif /* not CONFIG_SMP */ |
| |
| #define switch_to(prev, next, last) do { \ |
| register unsigned long arg0 __asm__ ("r0") = (unsigned long)prev; \ |
| register unsigned long arg1 __asm__ ("r1") = (unsigned long)next; \ |
| register unsigned long *oldsp __asm__ ("r2") = &(prev->thread.sp); \ |
| register unsigned long *newsp __asm__ ("r3") = &(next->thread.sp); \ |
| register unsigned long *oldlr __asm__ ("r4") = &(prev->thread.lr); \ |
| register unsigned long *newlr __asm__ ("r5") = &(next->thread.lr); \ |
| register struct task_struct *__last __asm__ ("r6"); \ |
| __asm__ __volatile__ ( \ |
| "st r8, @-r15 \n\t" \ |
| "st r9, @-r15 \n\t" \ |
| "st r10, @-r15 \n\t" \ |
| "st r11, @-r15 \n\t" \ |
| "st r12, @-r15 \n\t" \ |
| "st r13, @-r15 \n\t" \ |
| "st r14, @-r15 \n\t" \ |
| "seth r14, #high(1f) \n\t" \ |
| "or3 r14, r14, #low(1f) \n\t" \ |
| "st r14, @r4 ; store old LR \n\t" \ |
| "st r15, @r2 ; store old SP \n\t" \ |
| "ld r15, @r3 ; load new SP \n\t" \ |
| "st r0, @-r15 ; store 'prev' onto new stack \n\t" \ |
| "ld r14, @r5 ; load new LR \n\t" \ |
| "jmp r14 \n\t" \ |
| ".fillinsn \n " \ |
| "1: \n\t" \ |
| "ld r6, @r15+ ; load 'prev' from new stack \n\t" \ |
| "ld r14, @r15+ \n\t" \ |
| "ld r13, @r15+ \n\t" \ |
| "ld r12, @r15+ \n\t" \ |
| "ld r11, @r15+ \n\t" \ |
| "ld r10, @r15+ \n\t" \ |
| "ld r9, @r15+ \n\t" \ |
| "ld r8, @r15+ \n\t" \ |
| : "=&r" (__last) \ |
| : "r" (arg0), "r" (arg1), "r" (oldsp), "r" (newsp), \ |
| "r" (oldlr), "r" (newlr) \ |
| : "memory" \ |
| ); \ |
| last = __last; \ |
| } while(0) |
| |
| /* Interrupt Control */ |
| #if !defined(CONFIG_CHIP_M32102) |
| #define local_irq_enable() \ |
| __asm__ __volatile__ ("setpsw #0x40 -> nop": : :"memory") |
| #define local_irq_disable() \ |
| __asm__ __volatile__ ("clrpsw #0x40 -> nop": : :"memory") |
| #else /* CONFIG_CHIP_M32102 */ |
| static inline void local_irq_enable(void) |
| { |
| unsigned long tmpreg; |
| __asm__ __volatile__( |
| "mvfc %0, psw; \n\t" |
| "or3 %0, %0, #0x0040; \n\t" |
| "mvtc %0, psw; \n\t" |
| : "=&r" (tmpreg) : : "cbit", "memory"); |
| } |
| |
| static inline void local_irq_disable(void) |
| { |
| unsigned long tmpreg0, tmpreg1; |
| __asm__ __volatile__( |
| "ld24 %0, #0 ; Use 32-bit insn. \n\t" |
| "mvfc %1, psw ; No interrupt can be accepted here. \n\t" |
| "mvtc %0, psw \n\t" |
| "and3 %0, %1, #0xffbf \n\t" |
| "mvtc %0, psw \n\t" |
| : "=&r" (tmpreg0), "=&r" (tmpreg1) : : "cbit", "memory"); |
| } |
| #endif /* CONFIG_CHIP_M32102 */ |
| |
| #define local_save_flags(x) \ |
| __asm__ __volatile__("mvfc %0,psw" : "=r"(x) : /* no input */) |
| |
| #define local_irq_restore(x) \ |
| __asm__ __volatile__("mvtc %0,psw" : /* no outputs */ \ |
| : "r" (x) : "cbit", "memory") |
| |
| #if !defined(CONFIG_CHIP_M32102) |
| #define local_irq_save(x) \ |
| __asm__ __volatile__( \ |
| "mvfc %0, psw; \n\t" \ |
| "clrpsw #0x40 -> nop; \n\t" \ |
| : "=r" (x) : /* no input */ : "memory") |
| #else /* CONFIG_CHIP_M32102 */ |
| #define local_irq_save(x) \ |
| ({ \ |
| unsigned long tmpreg; \ |
| __asm__ __volatile__( \ |
| "ld24 %1, #0 \n\t" \ |
| "mvfc %0, psw \n\t" \ |
| "mvtc %1, psw \n\t" \ |
| "and3 %1, %0, #0xffbf \n\t" \ |
| "mvtc %1, psw \n\t" \ |
| : "=r" (x), "=&r" (tmpreg) \ |
| : : "cbit", "memory"); \ |
| }) |
| #endif /* CONFIG_CHIP_M32102 */ |
| |
| #define irqs_disabled() \ |
| ({ \ |
| unsigned long flags; \ |
| local_save_flags(flags); \ |
| !(flags & 0x40); \ |
| }) |
| |
| #define nop() __asm__ __volatile__ ("nop" : : ) |
| |
| #define xchg(ptr,x) \ |
| ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) |
| |
| #define tas(ptr) (xchg((ptr),1)) |
| |
| #ifdef CONFIG_SMP |
| extern void __xchg_called_with_bad_pointer(void); |
| #endif |
| |
| #ifdef CONFIG_CHIP_M32700_TS1 |
| #define DCACHE_CLEAR(reg0, reg1, addr) \ |
| "seth "reg1", #high(dcache_dummy); \n\t" \ |
| "or3 "reg1", "reg1", #low(dcache_dummy); \n\t" \ |
| "lock "reg0", @"reg1"; \n\t" \ |
| "add3 "reg0", "addr", #0x1000; \n\t" \ |
| "ld "reg0", @"reg0"; \n\t" \ |
| "add3 "reg0", "addr", #0x2000; \n\t" \ |
| "ld "reg0", @"reg0"; \n\t" \ |
| "unlock "reg0", @"reg1"; \n\t" |
| /* FIXME: This workaround code cannot handle kenrel modules |
| * correctly under SMP environment. |
| */ |
| #else /* CONFIG_CHIP_M32700_TS1 */ |
| #define DCACHE_CLEAR(reg0, reg1, addr) |
| #endif /* CONFIG_CHIP_M32700_TS1 */ |
| |
| static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, |
| int size) |
| { |
| unsigned long flags; |
| unsigned long tmp = 0; |
| |
| local_irq_save(flags); |
| |
| switch (size) { |
| #ifndef CONFIG_SMP |
| case 1: |
| __asm__ __volatile__ ( |
| "ldb %0, @%2 \n\t" |
| "stb %1, @%2 \n\t" |
| : "=&r" (tmp) : "r" (x), "r" (ptr) : "memory"); |
| break; |
| case 2: |
| __asm__ __volatile__ ( |
| "ldh %0, @%2 \n\t" |
| "sth %1, @%2 \n\t" |
| : "=&r" (tmp) : "r" (x), "r" (ptr) : "memory"); |
| break; |
| case 4: |
| __asm__ __volatile__ ( |
| "ld %0, @%2 \n\t" |
| "st %1, @%2 \n\t" |
| : "=&r" (tmp) : "r" (x), "r" (ptr) : "memory"); |
| break; |
| #else /* CONFIG_SMP */ |
| case 4: |
| __asm__ __volatile__ ( |
| DCACHE_CLEAR("%0", "r4", "%2") |
| "lock %0, @%2; \n\t" |
| "unlock %1, @%2; \n\t" |
| : "=&r" (tmp) : "r" (x), "r" (ptr) |
| : "memory" |
| #ifdef CONFIG_CHIP_M32700_TS1 |
| , "r4" |
| #endif /* CONFIG_CHIP_M32700_TS1 */ |
| ); |
| break; |
| default: |
| __xchg_called_with_bad_pointer(); |
| #endif /* CONFIG_SMP */ |
| } |
| |
| local_irq_restore(flags); |
| |
| return (tmp); |
| } |
| |
| #define __HAVE_ARCH_CMPXCHG 1 |
| |
| static __inline__ unsigned long |
| __cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new) |
| { |
| unsigned long flags; |
| unsigned int retval; |
| |
| local_irq_save(flags); |
| __asm__ __volatile__ ( |
| DCACHE_CLEAR("%0", "r4", "%1") |
| M32R_LOCK" %0, @%1; \n" |
| " bne %0, %2, 1f; \n" |
| M32R_UNLOCK" %3, @%1; \n" |
| " bra 2f; \n" |
| " .fillinsn \n" |
| "1:" |
| M32R_UNLOCK" %2, @%1; \n" |
| " .fillinsn \n" |
| "2:" |
| : "=&r" (retval) |
| : "r" (p), "r" (old), "r" (new) |
| : "cbit", "memory" |
| #ifdef CONFIG_CHIP_M32700_TS1 |
| , "r4" |
| #endif /* CONFIG_CHIP_M32700_TS1 */ |
| ); |
| local_irq_restore(flags); |
| |
| return retval; |
| } |
| |
| /* This function doesn't exist, so you'll get a linker error |
| if something tries to do an invalid cmpxchg(). */ |
| extern void __cmpxchg_called_with_bad_pointer(void); |
| |
| static __inline__ unsigned long |
| __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) |
| { |
| switch (size) { |
| case 4: |
| return __cmpxchg_u32(ptr, old, new); |
| #if 0 /* we don't have __cmpxchg_u64 */ |
| case 8: |
| return __cmpxchg_u64(ptr, old, new); |
| #endif /* 0 */ |
| } |
| __cmpxchg_called_with_bad_pointer(); |
| return old; |
| } |
| |
| #define cmpxchg(ptr,o,n) \ |
| ({ \ |
| __typeof__(*(ptr)) _o_ = (o); \ |
| __typeof__(*(ptr)) _n_ = (n); \ |
| (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ |
| (unsigned long)_n_, sizeof(*(ptr))); \ |
| }) |
| |
| #endif /* __KERNEL__ */ |
| |
| /* |
| * Memory barrier. |
| * |
| * mb() prevents loads and stores being reordered across this point. |
| * rmb() prevents loads being reordered across this point. |
| * wmb() prevents stores being reordered across this point. |
| */ |
| #define mb() barrier() |
| #define rmb() mb() |
| #define wmb() mb() |
| |
| /** |
| * read_barrier_depends - Flush all pending reads that subsequents reads |
| * depend on. |
| * |
| * No data-dependent reads from memory-like regions are ever reordered |
| * over this barrier. All reads preceding this primitive are guaranteed |
| * to access memory (but not necessarily other CPUs' caches) before any |
| * reads following this primitive that depend on the data return by |
| * any of the preceding reads. This primitive is much lighter weight than |
| * rmb() on most CPUs, and is never heavier weight than is |
| * rmb(). |
| * |
| * These ordering constraints are respected by both the local CPU |
| * and the compiler. |
| * |
| * Ordering is not guaranteed by anything other than these primitives, |
| * not even by data dependencies. See the documentation for |
| * memory_barrier() for examples and URLs to more information. |
| * |
| * For example, the following code would force ordering (the initial |
| * value of "a" is zero, "b" is one, and "p" is "&a"): |
| * |
| * <programlisting> |
| * CPU 0 CPU 1 |
| * |
| * b = 2; |
| * memory_barrier(); |
| * p = &b; q = p; |
| * read_barrier_depends(); |
| * d = *q; |
| * </programlisting> |
| * |
| * |
| * because the read of "*q" depends on the read of "p" and these |
| * two reads are separated by a read_barrier_depends(). However, |
| * the following code, with the same initial values for "a" and "b": |
| * |
| * <programlisting> |
| * CPU 0 CPU 1 |
| * |
| * a = 2; |
| * memory_barrier(); |
| * b = 3; y = b; |
| * read_barrier_depends(); |
| * x = a; |
| * </programlisting> |
| * |
| * does not enforce ordering, since there is no data dependency between |
| * the read of "a" and the read of "b". Therefore, on some CPUs, such |
| * as Alpha, "y" could be set to 3 and "x" to 0. Use rmb() |
| * in cases like thiswhere there are no data dependencies. |
| **/ |
| |
| #define read_barrier_depends() do { } while (0) |
| |
| #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 |
| |
| #define set_mb(var, value) do { xchg(&var, value); } while (0) |
| #define set_wmb(var, value) do { var = value; wmb(); } while (0) |
| |
| #define arch_align_stack(x) (x) |
| |
| #endif /* _ASM_M32R_SYSTEM_H */ |
