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/*

 * Copyright (c) 2005 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup sparc64

 * @{

 */

/** @file

 */

#ifndef KERN_sparc64_ASM_H_

#define KERN_sparc64_ASM_H_

#include <arch/arch.h>

#include <arch/types.h>

#include <typedefs.h>

#include <align.h>

#include <arch/register.h>

#include <config.h>

#include <arch/stack.h>

/** Read Processor State register.

 *

 * @return Value of PSTATE register.

 */

static inline uint64_t pstate_read(void)

{

    uint64_t v;

    asm volatile ("rdpr %%pstate, %0\n" : "=r" (v));

    return v;

}

/** Write Processor State register.

 *

 * @param v New value of PSTATE register.

 */

static inline void pstate_write(uint64_t v)

{

    asm volatile ("wrpr %0, %1, %%pstate\n" : : "r" (v), "i" (0));

}

/** Read TICK_compare Register.

 *

 * @return Value of TICK_comapre register.

 */

static inline uint64_t tick_compare_read(void)

{

    uint64_t v;

    asm volatile ("rd %%tick_cmpr, %0\n" : "=r" (v));

    return v;

}

/** Write TICK_compare Register.

 *

 * @param v New value of TICK_comapre register.

 */

static inline void tick_compare_write(uint64_t v)

{

    asm volatile ("wr %0, %1, %%tick_cmpr\n" : : "r" (v), "i" (0));

}

/** Read TICK Register.

 *

 * @return Value of TICK register.

 */

static inline uint64_t tick_read(void)

{

    uint64_t v;

    asm volatile ("rdpr %%tick, %0\n" : "=r" (v));

    return v;

}

/** Write TICK Register.

 *

 * @param v New value of TICK register.

 */

static inline void tick_write(uint64_t v)

{

    asm volatile ("wrpr %0, %1, %%tick\n" : : "r" (v), "i" (0));

}

/** Read FPRS Register.

 *

 * @return Value of FPRS register.

 */

static inline uint64_t fprs_read(void)

{

    uint64_t v;

    asm volatile ("rd %%fprs, %0\n" : "=r" (v));

    return v;

}

/** Write FPRS Register.

 *

 * @param v New value of FPRS register.

 */

static inline void fprs_write(uint64_t v)

{

    asm volatile ("wr %0, %1, %%fprs\n" : : "r" (v), "i" (0));

}

/** Read SOFTINT Register.

 *

 * @return Value of SOFTINT register.

 */

static inline uint64_t softint_read(void)

{

    uint64_t v;

    asm volatile ("rd %%softint, %0\n" : "=r" (v));

    return v;

}

/** Write SOFTINT Register.

 *

 * @param v New value of SOFTINT register.

 */

static inline void softint_write(uint64_t v)

{

    asm volatile ("wr %0, %1, %%softint\n" : : "r" (v), "i" (0));

}

/** Write CLEAR_SOFTINT Register.

 *

 * Bits set in CLEAR_SOFTINT register will be cleared in SOFTINT register.

 *

 * @param v New value of CLEAR_SOFTINT register.

 */

static inline void clear_softint_write(uint64_t v)

{

    asm volatile ("wr %0, %1, %%clear_softint\n" : : "r" (v), "i" (0));

}

/** Write SET_SOFTINT Register.

 *

 * Bits set in SET_SOFTINT register will be set in SOFTINT register.

 *

 * @param v New value of SET_SOFTINT register.

 */

static inline void set_softint_write(uint64_t v)

{

    asm volatile ("wr %0, %1, %%set_softint\n" : : "r" (v), "i" (0));

}

/** Enable interrupts.

 *

 * Enable interrupts and return previous

 * value of IPL.

 *

 * @return Old interrupt priority level.

 */

static inline ipl_t interrupts_enable(void) {

    pstate_reg_t pstate;

    uint64_t value;

    value = pstate_read();

    pstate.value = value;

    pstate.ie = true;

    pstate_write(pstate.value);

    return (ipl_t) value;

}

/** Disable interrupts.

 *

 * Disable interrupts and return previous

 * value of IPL.

 *

 * @return Old interrupt priority level.

 */

static inline ipl_t interrupts_disable(void) {

    pstate_reg_t pstate;

    uint64_t value;

    value = pstate_read();

    pstate.value = value;

    pstate.ie = false;

    pstate_write(pstate.value);

    return (ipl_t) value;

}

/** Restore interrupt priority level.

 *

 * Restore IPL.

 *

 * @param ipl Saved interrupt priority level.

 */

static inline void interrupts_restore(ipl_t ipl) {

    pstate_reg_t pstate;

    pstate.value = pstate_read();

    pstate.ie = ((pstate_reg_t) ipl).ie;

    pstate_write(pstate.value);

}

/** Return interrupt priority level.

 *

 * Return IPL.

 *

 * @return Current interrupt priority level.

 */

static inline ipl_t interrupts_read(void) {

    return (ipl_t) pstate_read();

}

/** Return base address of current stack.

 *

 * Return the base address of the current stack.

 * The stack is assumed to be STACK_SIZE bytes long.

 * The stack must start on page boundary.

 */

static inline uintptr_t get_stack_base(void)

{

    uintptr_t unbiased_sp;

    asm volatile ("add %%sp, %1, %0\n" : "=r" (unbiased_sp) : "i" (STACK_BIAS));

    return ALIGN_DOWN(unbiased_sp, STACK_SIZE);

}

/** Read Version Register.

 *

 * @return Value of VER register.

 */

static inline uint64_t ver_read(void)

{

    uint64_t v;

    asm volatile ("rdpr %%ver, %0\n" : "=r" (v));

    return v;

}

/** Read Trap Program Counter register.

 *

 * @return Current value in TPC.

 */

static inline uint64_t tpc_read(void)

{

    uint64_t v;

    asm volatile ("rdpr %%tpc, %0\n" : "=r" (v));

    return v;

}

/** Read Trap Level register.

 *

 * @return Current value in TL.

 */

static inline uint64_t tl_read(void)

{

    uint64_t v;

    asm volatile ("rdpr %%tl, %0\n" : "=r" (v));

    return v;

}

/** Read Trap Base Address register.

 *

 * @return Current value in TBA.

 */

static inline uint64_t tba_read(void)

{

    uint64_t v;

    asm volatile ("rdpr %%tba, %0\n" : "=r" (v));

    return v;

}

/** Write Trap Base Address register.

 *

 * @param v New value of TBA.

 */

static inline void tba_write(uint64_t v)

{

    asm volatile ("wrpr %0, %1, %%tba\n" : : "r" (v), "i" (0));

}

/** Load uint64_t from alternate space.

 *

 * @param asi ASI determining the alternate space.

 * @param va Virtual address within the ASI.

 *

 * @return Value read from the virtual address in the specified address space.

 */

static inline uint64_t asi_u64_read(asi_t asi, uintptr_t va)

{

    uint64_t v;

    asm volatile ("ldxa [%1] %2, %0\n" : "=r" (v) : "r" (va), "i" ((unsigned) asi));

    return v;

}

/** Store uint64_t to alternate space.

 *

 * @param asi ASI determining the alternate space.

 * @param va Virtual address within the ASI.

 * @param v Value to be written.

 */

static inline void asi_u64_write(asi_t asi, uintptr_t va, uint64_t v)

{

    asm volatile ("stxa %0, [%1] %2\n" : :  "r" (v), "r" (va), "i" ((unsigned) asi) : "memory");

}

/** Flush all valid register windows to memory. */

static inline void flushw(void)

{

    asm volatile ("flushw\n");

}

/** Switch to nucleus by setting TL to 1. */

static inline void nucleus_enter(void)

{

    asm volatile ("wrpr %g0, 1, %tl\n");

}

/** Switch from nucleus by setting TL to 0. */

static inline void nucleus_leave(void)

{

    asm volatile ("wrpr %g0, %g0, %tl\n");

}

/** Read UPA_CONFIG register.

 *

 * @return Value of the UPA_CONFIG register.

 */

static inline uint64_t upa_config_read(void)

{

    return asi_u64_read(ASI_UPA_CONFIG, 0);

}

extern void cpu_halt(void);

extern void cpu_sleep(void);

extern void asm_delay_loop(const uint32_t usec);

extern uint64_t read_from_ag_g7(void);

extern void write_to_ag_g6(uint64_t val);

extern void write_to_ag_g7(uint64_t val);

extern void write_to_ig_g6(uint64_t val);

extern void switch_to_userspace(uint64_t pc, uint64_t sp, uint64_t uarg);

#endif

/** @}

 */