//  IBM_PROLOG_BEGIN_TAG
//  This is an automatically generated prolog.
//
//  $Source: src/lib/syscall_mmio.C $
//
//  IBM CONFIDENTIAL
//
//  COPYRIGHT International Business Machines Corp. 2010 - 2011
//
//  p1
//
//  Object Code Only (OCO) source materials
//  Licensed Internal Code Source Materials
//  IBM HostBoot Licensed Internal Code
//
//  The source code for this program is not published or other-
//  wise divested of its trade secrets, irrespective of what has
//  been deposited with the U.S. Copyright Office.
//
//  Origin: 30
//
//  IBM_PROLOG_END
#include <sys/syscall.h>
#include <sys/mmio.h>
#include <assert.h>
#include <kernel/task.H>
#include <kernel/cpu.H>
#include <kernel/cpuid.H>

using namespace Systemcalls;

void* mmio_map(void* ra, size_t pages)
{
    return _syscall2(MMIO_MAP, ra, (void*)pages);
}

int mmio_unmap(void* ea, size_t pages)
{
    return (int64_t) _syscall2(MMIO_UNMAP, ea, (void*)pages);
}

void* mmio_dev_map(void *ra, SEG_DATA_SIZES i_devDataSize)
{
    return _syscall2(DEV_MAP, ra, (void*)i_devDataSize);
}

int mmio_dev_unmap(void *ea)
{
    return (int64_t) _syscall1(DEV_UNMAP, ea);
}

uint64_t mmio_hmer_read()
{
    return (uint64_t) _syscall0(MMIO_HMER_READ);
}

void mmio_hmer_write(uint64_t value)
{
    _syscall1(MMIO_HMER_WRITE, (void*)value);
}

/** @brief Determine the base register address of the mmio_scratch_base.
 *
 *  Since this code is called from within the kernel as part of static
 *  construction of g_mmio_scratch_base, we can use internal kernel
 *  functions here (and not system calls) to determine the CPU type.
 *
 *  @return Base address (SPRC value) of the scratch registers.
 */
static uint64_t mmio_scratch_base()
{
    ProcessorCoreType cpuType = CpuID::getCpuType();
    switch (cpuType)
    {
        case CORE_POWER7:
        case CORE_POWER7_PLUS:
            return 0x20;

        case CORE_POWER8_SALERNO:
        case CORE_POWER8_VENICE:
        case CORE_UNKNOWN:
        default:
            return 0x40;
    }
}
    /** Global cache of the scratch register SPRC base address. */
uint64_t g_mmio_scratch_base = mmio_scratch_base();

uint64_t mmio_scratch_read(uint64_t which)
{
    return (uint64_t) _syscall1(MMIO_SCRATCH_READ,
                                (void*)(which + g_mmio_scratch_base));
}

void mmio_scratch_write(uint64_t which, uint64_t value)
{
    _syscall2(MMIO_SCRATCH_WRITE,
              (void*)(which + g_mmio_scratch_base), (void*)value);
}

mutex_t * mmio_xscom_mutex()
{
    // Get task structure.
    register task_t* task;
    asm volatile("mr %0, 13" : "=r"(task));

    // Ensure task is pinned.
    crit_assert(task->affinity_pinned);

    // Return mutex from cpu structure.
    return &task->cpu->xscom_mutex;
}