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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<title>Mu - apps/ex13.mu</title>
+<meta name="Generator" content="Vim/8.2">
+<meta name="plugin-version" content="vim8.1_v2">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback">
+<meta name="colorscheme" content="minimal-light">
+<style>
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.PreProc { color: #c000c0; }
+.muRegEbx { color: #5f00ff; }
+.LineNr { }
+.muRegEsi { color: #005faf; }
+.Constant { color: #008787; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.Delimiter { color: #c000c0; }
+.muComment { color: #005faf; }
+.Special { color: #ff6060; }
+-->
+</style>
+
+<script>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/apps/ex13.mu'>https://github.com/akkartik/mu/blob/main/apps/ex13.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Load an image from disk and display it on screen.</span>
+<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
+<span id="L3" class="LineNr"> 3 </span><span class="muComment"># Build the code disk:</span>
+<span id="L4" class="LineNr"> 4 </span><span class="muComment">#   $ ./translate apps/ex13.mu                       # generates code.img</span>
+<span id="L5" class="LineNr"> 5 </span><span class="muComment"># Load a pbm, pgm or ppm image (no more than 255 levels) in the data disk</span>
+<span id="L6" class="LineNr"> 6 </span><span class="muComment">#   $ dd if=/dev/zero of=data.img count=20160</span>
+<span id="L7" class="LineNr"> 7 </span><span class="muComment">#   $ dd if=___ of=data.img conv=notrunc</span>
+<span id="L8" class="LineNr"> 8 </span><span class="muComment"># Run:</span>
+<span id="L9" class="LineNr"> 9 </span><span class="muComment">#   $ qemu-system-i386 -hda code.img -hdb data.img</span>
+<span id="L10" class="LineNr">10 </span>
+<span id="L11" class="LineNr">11 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex13.mu.html#L11'>main</a></span> <a href='../500fake-screen.mu.html#L14'>screen</a>: (addr <a href='../500fake-screen.mu.html#L14'>screen</a>), keyboard: (addr keyboard), data-disk: (addr disk) <span class="Delimiter">{</span>
+<span id="L12" class="LineNr">12 </span>  <span class="PreProc">var</span> img-storage: <a href='../511image.mu.html#L6'>image</a>
+<span id="L13" class="LineNr">13 </span>  <span class="PreProc">var</span> img/<span class="muRegEsi">esi</span>: (addr <a href='../511image.mu.html#L6'>image</a>) <span class="Special">&lt;-</span> address img-storage
+<span id="L14" class="LineNr">14 </span>  <a href='ex13.mu.html#L18'>load-image</a> img, data-disk
+<span id="L15" class="LineNr">15 </span>  <a href='../511image.mu.html#L53'>render-image</a> <a href='../500fake-screen.mu.html#L14'>screen</a>, img, <span class="Constant">0</span>/x, <span class="Constant">0</span>/y, <span class="Constant">0x300</span>/width, <span class="Constant">0x300</span>/height
+<span id="L16" class="LineNr">16 </span><span class="Delimiter">}</span>
+<span id="L17" class="LineNr">17 </span>
+<span id="L18" class="LineNr">18 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex13.mu.html#L18'>load-image</a></span> self: (addr <a href='../511image.mu.html#L6'>image</a>), data-disk: (addr disk) <span class="Delimiter">{</span>
+<span id="L19" class="LineNr">19 </span>  <span class="PreProc">var</span> s-storage: (stream byte <span class="Constant">0x200000</span>)  <span class="muComment"># 512* 0x1000 sectors</span>
+<span id="L20" class="LineNr">20 </span>  <span class="PreProc">var</span> s/<span class="muRegEbx">ebx</span>: (addr stream byte) <span class="Special">&lt;-</span> address s-storage
+<span id="L21" class="LineNr">21 </span>  <a href='../510disk.mu.html#L1'>load-sectors</a> data-disk, <span class="Constant">0</span>/lba, <span class="Constant">0x1000</span>/sectors, s
+<span id="L22" class="LineNr">22 </span>  <a href='../511image.mu.html#L17'>initialize-image</a> self, s
+<span id="L23" class="LineNr">23 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-06-29 06:11:58 +0000
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#include "fs.h"
#include "common.h"
#include "list.h"
#include "alloc.h"
#include "spinlock.h"
#include "vmm.h"
#include "sharedmemory.h"

static List* gShmList = NULL;
static Spinlock gShmListLock;

static FileSystemNode* gShmRoot = NULL;

static FileSystemDirent gDirent;

static BOOL sharedmemorydir_open(File *file, uint32 flags);
static FileSystemDirent *sharedmemorydir_readdir(FileSystemNode *node, uint32 index);
static FileSystemNode *sharedmemorydir_finddir(FileSystemNode *node, char *name);

typedef struct SharedMemory {
    FileSystemNode* node;
    List* physicalAddressList;
    Spinlock physicalAddressListLock;
    //TODO: permissions
} SharedMemory;

void initializeSharedMemory() {
    Spinlock_Init(&gShmListLock);

    gShmList = List_Create();

    gShmRoot = getFileSystemNode("/system/shm");

    if (NULL == gShmRoot) {
        WARNING("/system/shm not found!!");
    }
    else {
        gShmRoot->open = sharedmemorydir_open;
        gShmRoot->finddir = sharedmemorydir_finddir;
        gShmRoot->readdir = sharedmemorydir_readdir;
    }
}

static BOOL sharedmemorydir_open(File *file, uint32 flags) {
    return TRUE;
}

static FileSystemDirent *sharedmemorydir_readdir(FileSystemNode *node, uint32 index) {
    FileSystemDirent* result = NULL;

    int counter = 0;

    Spinlock_Lock(&gShmListLock);

    List_Foreach (n, gShmList) {
        SharedMemory* p = (SharedMemory*)n->data;

        if (counter == index) {
            strcpy(gDirent.name, p->node->name);
            gDirent.fileType = p->node->nodeType;

            result = &gDirent;

            break;
        }
        ++counter;
    }

    Spinlock_Unlock(&gShmListLock);

    return result;
}

static FileSystemNode *sharedmemorydir_finddir(FileSystemNode *node, char *name) {
    FileSystemNode* result = NULL;

    Spinlock_Lock(&gShmListLock);

    List_Foreach (n, gShmList) {
        SharedMemory* p = (SharedMemory*)n->data;

        if (strcmp(name, p->node->name) == 0) {
            result = p->node;
            break;
        }
    }

    Spinlock_Unlock(&gShmListLock);

    return result;
}

static BOOL sharedmemory_open(File *file, uint32 flags) {
    return TRUE;
}

static void sharedmemory_unlink(File *file) {
    destroySharedMemory(file->node->name);
}

static int32 sharedmemory_ftruncate(File *file, int32 length) {
    if (length <= 0) {
        return -1;
    }

    SharedMemory* sharedMem = (SharedMemory*)file->node->privateNodeData;

    if (0 != file->node->length) {
        //already set
        return -1;
    }

    int pageCount = (length / PAGESIZE_4M) + 1;

    Spinlock_Lock(&sharedMem->physicalAddressListLock);

    for (int i = 0; i < pageCount; ++i) {
        char* pAddress = getPageFrame4M();

        List_Append(sharedMem->physicalAddressList, pAddress);
    }

    file->node->length = length;

    Spinlock_Unlock(&sharedMem->physicalAddressListLock);

    return 0;
}

static void* sharedmemory_mmap(File* file, uint32 size, uint32 offset, uint32 flags) {
    void* result = NULL;

    SharedMemory* sharedMem = (SharedMemory*)file->node->privateNodeData;

    Spinlock_Lock(&sharedMem->physicalAddressListLock);

    if (List_GetCount(sharedMem->physicalAddressList) > 0) {
        result = mapMemory(file->thread->owner, size, 0, sharedMem->physicalAddressList);
    }

    Spinlock_Unlock(&sharedMem->physicalAddressListLock);

    return result;
}

FileSystemNode* getSharedMemoryNode(const char* name) {
    FileSystemNode* result = NULL;

    Spinlock_Lock(&gShmListLock);

    List_Foreach (n, gShmList) {
        SharedMemory* p = (SharedMemory*)n->data;

        if (strcmp(name, p->node->name) == 0) {
            result = p->node;
            break;
        }
    }

    Spinlock_Unlock(&gShmListLock);

    return result;
}

FileSystemNode* createSharedMemory(const char* name) {
    if (getSharedMemoryNode(name) != NULL) {
        return NULL;
    }

    SharedMemory* sharedMem = (SharedMemory*)kmalloc(sizeof(SharedMemory));
    memset((uint8*)sharedMem, 0, sizeof(SharedMemory));

    FileSystemNode* node = (FileSystemNode*)kmalloc(sizeof(FileSystemNode));
    memset((uint8*)node, 0, sizeof(FileSystemNode));

    strcpy(node->name, name);
    node->nodeType = FT_CharacterDevice;
    node->open = sharedmemory_open;
    //TODO: node->shm_unlink = sharedmemory_unlink;
    node->ftruncate = sharedmemory_ftruncate;
    node->mmap = sharedmemory_mmap;
    node->privateNodeData = sharedMem;

    sharedMem->node = node;
    sharedMem->physicalAddressList = List_Create();
    Spinlock_Init(&sharedMem->physicalAddressListLock);

    Spinlock_Lock(&gShmListLock);
    List_Append(gShmList, sharedMem);
    Spinlock_Unlock(&gShmListLock);

    return node;
}

void destroySharedMemory(const char* name) {
    SharedMemory* sharedMem = NULL;

    Spinlock_Lock(&gShmListLock);

    List_Foreach (n, gShmList) {
        SharedMemory* p = (SharedMemory*)n->data;

        if (strcmp(name, p->node->name) == 0) {
            sharedMem = (SharedMemory*)p;
            break;
        }
    }

    if (sharedMem) {
        Spinlock_Lock(&sharedMem->physicalAddressListLock);

        kfree(sharedMem->node);

        List_Destroy(sharedMem->physicalAddressList);

        List_RemoveFirstOccurrence(gShmList, sharedMem);

        Spinlock_Unlock(&sharedMem->physicalAddressListLock);

        kfree(sharedMem);
    }

    Spinlock_Unlock(&gShmListLock);
}
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-06-29 06:11:58 +0000