/*
 * Copyright 2017, Data61
 * Commonwealth Scientific and Industrial Research Organisation (CSIRO)
 * ABN 41 687 119 230.
 *
 * This software may be distributed and modified according to the terms of
 * the BSD 2-Clause license. Note that NO WARRANTY is provided.
 * See "LICENSE_BSD2.txt" for details.
 *
 * @TAG(DATA61_BSD)
 */

#include <autoconf.h>

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <inttypes.h>
#include <string.h>

#include <sel4/sel4.h>
#include <sel4debug/debug.h>
#include <simple-default/simple-default.h>

#include <vspace/page.h>
#include <vka/kobject_t.h>

void *simple_default_get_frame_info(void *data, void *paddr, int size_bits, seL4_CPtr *frame_cap, seL4_Word *offset)
{
    unsigned int i;
    seL4_BootInfo *bi = (seL4_BootInfo *) data;
    assert(bi && paddr && offset && frame_cap);

    for (i = 0; i < bi->untyped.end - bi->untyped.start; i++) {
        if (bi->untypedList[i].paddr <= (seL4_Word)paddr &&
            bi->untypedList[i].paddr + BIT(bi->untypedList[i].sizeBits) >= (seL4_Word)paddr + BIT(size_bits)) {
            *frame_cap = bi->untyped.start + i;
            *offset = (seL4_Word)paddr - bi->untypedList[i].paddr;
            break;
        }
    }
    return NULL;
}
seL4_Error simple_default_get_frame_cap(void *data, void *paddr, int size_bits, cspacepath_t *path)
{
    unsigned int i;
    seL4_BootInfo *bi = (seL4_BootInfo *) data;
    assert(bi && paddr);

    for (i = 0; i < bi->untyped.end - bi->untyped.start; i++) {
        if (bi->untypedList[i].paddr == (seL4_Word)paddr &&
            bi->untypedList[i].sizeBits >= size_bits) {
            return seL4_Untyped_Retype(bi->untyped.start + i, kobject_get_type(KOBJECT_FRAME, size_bits),
                                       size_bits, path->root, path->dest, path->destDepth, path->offset, 1);
        }
    }
    return seL4_FailedLookup;
}

void *simple_default_get_frame_mapping(void *data, void *paddr, int size_bits)
{
    return NULL;
}

seL4_Error simple_default_set_ASID(void *data, seL4_CPtr vspace)
{
    return seL4_ARCH_ASIDPool_Assign(seL4_CapInitThreadASIDPool, vspace);
}

int simple_default_cap_count(void *data)
{
    assert(data);

    seL4_BootInfo *bi = data;

    return (bi->sharedFrames.end - bi->sharedFrames.start)
           + (bi->userImageFrames.end - bi->userImageFrames.start)
           + (bi->userImagePaging.end - bi->userImagePaging.start)
           + (bi->untyped.end - bi->untyped.start)
           + SIMPLE_NUM_INIT_CAPS; //Include all the init caps
}

seL4_CPtr simple_default_nth_cap(void *data, int n)
{
    assert(data);

    seL4_BootInfo *bi = data;
    size_t shared_frame_range = bi->sharedFrames.end - bi->sharedFrames.start + SIMPLE_NUM_INIT_CAPS;
    size_t user_img_frame_range = bi->userImageFrames.end - bi->userImageFrames.start + shared_frame_range;
    size_t user_img_paging_range = bi->userImagePaging.end - bi->userImagePaging.start + user_img_frame_range;
    size_t untyped_range = bi->untyped.end - bi->untyped.start + user_img_paging_range;

    seL4_CPtr true_return = seL4_CapNull;

    if (n < SIMPLE_NUM_INIT_CAPS) {
        /* skip seL4_CapNull */
        true_return = (seL4_CPtr) n + 1;
#if !(defined(CONFIG_ARCH_IA32) || defined(CONFIG_ARCH_X86_64))
        /* skip seL4_CapIOPortControl on non-x86 */
        if (true_return >= seL4_CapIOPortControl) {
            true_return++;
        }
#endif
#ifndef CONFIG_IOMMU
        /* skip seL4_CapIOSpace if IOMMU isn't supported on x86 */
        if (true_return >= seL4_CapIOSpace) {
            true_return++;
        }
#endif
    } else if (n < shared_frame_range) {
        return bi->sharedFrames.start + (n - SIMPLE_NUM_INIT_CAPS);
    } else if (n < user_img_frame_range) {
        return bi->userImageFrames.start + (n - shared_frame_range);
    } else if (n < user_img_paging_range) {
        return bi->userImagePaging.start + (n - user_img_frame_range);
    } else if (n < untyped_range) {
        return bi->untyped.start + (n - user_img_paging_range);
    }

    return true_return;
}

seL4_CPtr simple_default_init_cap(void *data, seL4_CPtr cap_pos)
{
    return cap_pos;
}

uint8_t simple_default_cnode_size(void *data)
{
    assert(data);

    return ((seL4_BootInfo *)data)->initThreadCNodeSizeBits;
}

int simple_default_untyped_count(void *data)
{
    assert(data);

    return ((seL4_BootInfo *)data)->untyped.end - ((seL4_BootInfo *)data)->untyped.start;
}

seL4_CPtr simple_default_nth_untyped(void *data, int n, size_t *size_bits, uintptr_t *paddr, bool *device)
{
    assert(data);

    seL4_BootInfo *bi = data;

    if (n < (bi->untyped.end - bi->untyped.start)) {
        if (paddr != NULL) {
            *paddr = bi->untypedList[n].paddr;
        }
        if (size_bits != NULL) {
            *size_bits = bi->untypedList[n].sizeBits;
        }
        if (device != NULL) {
            *device = (bool)bi->untypedList[n].isDevice;
        }
        return bi->untyped.start + (n);
    }

    return seL4_CapNull;
}

int simple_default_userimage_count(void *data)
{
    assert(data);

    return ((seL4_BootInfo *)data)->userImageFrames.end - ((seL4_BootInfo *)data)->userImageFrames.start;
}

seL4_CPtr simple_default_nth_userimage(void *data, int n)
{
    assert(data);

    seL4_BootInfo *bi = data;

    if (n < (bi->userImageFrames.end - bi->userImageFrames.start)) {
        return bi->userImageFrames.start + (n);
    }

    return seL4_CapNull;
}

int simple_default_core_count(void *data)
{
    assert(data);

    return ((seL4_BootInfo *)data)->numNodes;
}

void simple_default_print(void *data)
{
    if (data == NULL) {
        ZF_LOGE("Data is null!");
    }

    debug_print_bootinfo(data);
}

seL4_CPtr simple_default_sched_control(void *data, int core)
{
    assert(core < simple_default_core_count(data));
#if CONFIG_KERNEL_MCS
    return ((seL4_BootInfo *) data)->schedcontrol.start + core;
#else
    ZF_LOGW("not implemented");
    return seL4_CapNull;
#endif
}

ssize_t simple_default_get_extended_bootinfo_size(void *data, seL4_Word type)
{
    if (data == NULL) {
        ZF_LOGE("Data is null!");
        return -1;
    }
    seL4_BootInfo *bi = data;

    /* start of the extended bootinfo is defined to be 4K from the start of regular bootinfo */
    uintptr_t cur = (uintptr_t)bi + PAGE_SIZE_4K;
    uintptr_t end = cur + bi->extraLen;
    while (cur < end) {
        seL4_BootInfoHeader *header = (seL4_BootInfoHeader *)cur;
        if (header->id == type) {
            return header->len;
        }
        cur += header->len;
    }
    return -1;
}

ssize_t simple_default_get_extended_bootinfo(void *data, seL4_Word type, void *dest, ssize_t max_len)
{
    assert(data);
    seL4_BootInfo *bi = data;

    if (max_len < 0) {
        ZF_LOGE("Unexpected negative size");
        return -1;
    }
    /* start of the extended bootinfo is defined to be 4K from the start of regular bootinfo */
    uintptr_t cur = (uintptr_t)bi + PAGE_SIZE_4K;
    uintptr_t end = cur + bi->extraLen;
    while (cur < end) {
        seL4_BootInfoHeader *header = (seL4_BootInfoHeader *)cur;
        if (header->id == type) {
            ssize_t copy_len = MIN(header->len, max_len);
            memcpy(dest, (void *)cur, copy_len);
            return copy_len;
        }
        cur += header->len;
    }
    return -1;
}

void simple_default_init_bootinfo(simple_t *simple, seL4_BootInfo *bi)
{
    assert(simple);
    assert(bi);

    simple->data = bi;
    simple->frame_info = &simple_default_get_frame_info;
    simple->frame_cap = &simple_default_get_frame_cap;
    simple->frame_mapping = &simple_default_get_frame_mapping;
    simple->ASID_assign = &simple_default_set_ASID;
    simple->cap_count = &simple_default_cap_count;
    simple->nth_cap = &simple_default_nth_cap;
    simple->init_cap = &simple_default_init_cap;
    simple->cnode_size = &simple_default_cnode_size;
    simple->untyped_count = &simple_default_untyped_count;
    simple->nth_untyped = &simple_default_nth_untyped;
    simple->userimage_count = &simple_default_userimage_count;
    simple->core_count = &simple_default_core_count;
    simple->nth_userimage = &simple_default_nth_userimage;
    simple->print = &simple_default_print;
    simple->sched_ctrl = &simple_default_sched_control;
    simple->extended_bootinfo_len = &simple_default_get_extended_bootinfo_size;
    simple->extended_bootinfo = &simple_default_get_extended_bootinfo;
    simple_default_init_arch_simple(&simple->arch_simple, NULL);
}