| 1 | /*
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| 2 | * Copyright (c) 2007 Michal Kebrt
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup kernel_arm32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * @brief Declarations of functions implemented in assembly.
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| 34 | */
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| 35 |
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| 36 | #ifndef KERN_arm32_ASM_H_
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| 37 | #define KERN_arm32_ASM_H_
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| 38 |
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| 39 | #include <typedefs.h>
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| 40 | #include <arch/cp15.h>
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| 41 | #include <arch/stack.h>
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| 42 | #include <config.h>
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| 43 | #include <arch/interrupt.h>
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| 44 | #include <trace.h>
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| 45 |
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| 46 | /** CPU specific way to sleep cpu.
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| 47 | *
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| 48 | * ARMv7 introduced wait for event and wait for interrupt (wfe/wfi).
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| 49 | * ARM920T has custom coprocessor action to do the same. See ARM920T Technical
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| 50 | * Reference Manual ch 4.9 p. 4-23 (103 in the PDF)
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| 51 | * ARM926EJ-S uses the same coprocessor instruction as ARM920T. See ARM926EJ-S
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| 52 | * chapter 2.3.8 p.2-22 (52 in the PDF)
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| 53 | *
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| 54 | * @note Although CP15WFI (mcr p15, 0, R0, c7, c0, 4) is defined in ARM
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| 55 | * Architecture reference manual for armv4/5, CP15 implementation is mandatory
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| 56 | * only for armv6+.
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| 57 | */
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| 58 | _NO_TRACE static inline void cpu_sleep(void)
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| 59 | {
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| 60 | #ifdef PROCESSOR_ARCH_armv7_a
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| 61 | asm volatile ("wfe");
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| 62 | #elif defined(PROCESSOR_ARCH_armv6) | defined(PROCESSOR_arm926ej_s) | defined(PROCESSOR_arm920t)
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| 63 | WFI_write(0);
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| 64 | #endif
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| 65 | }
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| 66 |
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| 67 | #ifdef PROCESSOR_ARCH_armv7_a
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| 68 | #define ARCH_SPIN_HINT() asm volatile ("yield")
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| 69 | #endif
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| 70 |
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| 71 | _NO_TRACE static inline void pio_write_8(ioport8_t *port, uint8_t v)
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| 72 | {
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| 73 | *port = v;
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| 74 | }
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| 75 |
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| 76 | _NO_TRACE static inline void pio_write_16(ioport16_t *port, uint16_t v)
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| 77 | {
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| 78 | *port = v;
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| 79 | }
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| 80 |
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| 81 | _NO_TRACE static inline void pio_write_32(ioport32_t *port, uint32_t v)
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| 82 | {
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| 83 | *port = v;
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| 84 | }
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| 85 |
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| 86 | _NO_TRACE static inline uint8_t pio_read_8(ioport8_t *port)
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| 87 | {
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| 88 | return *port;
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| 89 | }
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| 90 |
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| 91 | _NO_TRACE static inline uint16_t pio_read_16(ioport16_t *port)
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| 92 | {
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| 93 | return *port;
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| 94 | }
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| 95 |
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| 96 | _NO_TRACE static inline uint32_t pio_read_32(ioport32_t *port)
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| 97 | {
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| 98 | return *port;
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| 99 | }
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| 100 |
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| 101 | extern void cpu_halt(void) __attribute__((noreturn));
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| 102 | extern void asm_delay_loop(uint32_t t);
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| 103 | extern void userspace_asm(uintptr_t ustack, uintptr_t uspace_uarg,
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| 104 | uintptr_t entry);
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| 105 |
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| 106 | #endif
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| 107 |
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| 108 | /** @}
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| 109 | */
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