Add dynamic heap size allocation

Switch to EFI version

.gitignore

@@ -3,3 +3,4 @@ out/
 node_modules/
 *.iso
 *.img
+.clangd

README.md

@@ -36,6 +36,12 @@ st run build
 
 The built ISO can be found in `out/` directory.
 
+## How to setup development environment?
+
+```bash
+./src/scripts/setup_dev.sh
+```
+
 ## If you are an employer looking at this...
 
 I would appreciate if you messaged me and gave me some well-paid job. Also...

src/core/compat/minilibc.c

@@ -244,15 +244,119 @@ long strtol(const char *str, char **endptr, int base) {
     return result * sign;
 }
 
-#define HEAP_SIZE (8 * 1024 * 1024)
-static unsigned char heap[HEAP_SIZE];
+// Dynamic heap - will be initialized based on available RAM
+static unsigned char *heap = NULL;
+static size_t heap_size = 0;
 static size_t heap_pos = 0;
 
+// Forward declare EFI types we need
+typedef uint64_t EFI_STATUS;
+typedef void* EFI_HANDLE;
+typedef uint64_t UINT64;
+typedef uint32_t UINT32;
+typedef uintptr_t UINTN;
+
+typedef struct {
+    UINT32 Type;
+    UINT64 PhysicalStart;
+    UINT64 VirtualStart;
+    UINT64 NumberOfPages;
+    UINT64 Attribute;
+} EFI_MEMORY_DESCRIPTOR;
+
+typedef struct EFI_BOOT_SERVICES_PARTIAL {
+    // EFI_TABLE_HEADER (24 bytes) + 5 pointers (RaiseTPL, RestoreTPL, AllocatePages, FreePages, GetMemoryMap)
+    char padding[64]; // 24 + 5*8 = 64 bytes to reach AllocatePool
+    EFI_STATUS (*AllocatePool)(UINT32 PoolType, UINTN Size, void **Buffer);
+} EFI_BOOT_SERVICES_PARTIAL;
+
+typedef struct {
+    char hdr[24]; // EFI_TABLE_HEADER
+    void *firmwareVendor;
+    UINT32 firmwareRevision;
+    void *consoleInHandle;
+    void *conIn;
+    void *consoleOutHandle;
+    void *ConOut;
+    void *standardErrorHandle;
+    void *stdErr;
+    void *runtimeServices;
+    EFI_BOOT_SERVICES_PARTIAL *BootServices;
+} EFI_SYSTEM_TABLE_PARTIAL;
+
+#define EfiConventionalMemory 7
+
+// Initialize heap with maximum available memory
+void init_heap(void *system_table) {
+    // Static fallback heap in case EFI allocation fails
+    static unsigned char static_heap[64 * 1024 * 1024]; // 64 MB fallback
+    
+    EFI_SYSTEM_TABLE_PARTIAL *st = (EFI_SYSTEM_TABLE_PARTIAL*)system_table;
+    
+    // Safety check
+    if (!st || !st->BootServices || !st->BootServices->AllocatePool) {
+        printf("WARNING: EFI Boot Services not available, using static heap\n");
+        heap = static_heap;
+        heap_size = sizeof(static_heap);
+        heap_pos = 0;
+        printf("Heap initialized: %zu MB (static fallback)\n", heap_size / (1024 * 1024));
+        return;
+    }
+    
+    // Try to allocate a very large heap - start with 16 GB and work down if needed
+    size_t sizes[] = {
+        16ULL * 1024 * 1024 * 1024,  // 16 GB
+        8ULL * 1024 * 1024 * 1024,   // 8 GB
+        4ULL * 1024 * 1024 * 1024,   // 4 GB
+        2ULL * 1024 * 1024 * 1024,   // 2 GB
+        1ULL * 1024 * 1024 * 1024,   // 1 GB
+        512ULL * 1024 * 1024,        // 512 MB
+        256ULL * 1024 * 1024,        // 256 MB
+        128ULL * 1024 * 1024,        // 128 MB
+        64ULL * 1024 * 1024,         // 64 MB
+        32ULL * 1024 * 1024,         // 32 MB
+        16ULL * 1024 * 1024,         // 16 MB
+        8ULL * 1024 * 1024           // 8 MB (fallback)
+    };
+    
+    for (int i = 0; i < 12; i++) {
+        EFI_STATUS status = st->BootServices->AllocatePool(
+            EfiConventionalMemory,
+            sizes[i],
+            (void**)&heap
+        );
+        
+        if (status == 0) { // EFI_SUCCESS
+            heap_size = sizes[i];
+            heap_pos = 0;
+            if (heap_size >= 1024ULL * 1024 * 1024) {
+                printf("Heap initialized: %zu GB (%zu bytes)\n", 
+                       heap_size / (1024ULL * 1024 * 1024), heap_size);
+            } else {
+                printf("Heap initialized: %zu MB (%zu bytes)\n", 
+                       heap_size / (1024 * 1024), heap_size);
+            }
+            return;
+        }
+    }
+    
+    // If all EFI allocations failed, use static heap
+    printf("WARNING: EFI allocation failed, using static heap\n");
+    heap = static_heap;
+    heap_size = sizeof(static_heap);
+    heap_pos = 0;
+    printf("Heap initialized: %zu MB (static fallback)\n", heap_size / (1024 * 1024));
+}
+
 void *malloc(size_t size) {
+    if (!heap) {
+        printf("malloc failed: heap not initialized\n");
+        return (void*)0;
+    }
     size = (size + 7) & ~7;
     size_t total = size + 8;
-    if (heap_pos + total > HEAP_SIZE) {
-        printf("malloc failed: OOM\n");
+    if (heap_pos + total > heap_size) {
+        printf("malloc failed: OOM (requested %zu, available %zu)\n", total, heap_size - heap_pos);
         return (void*)0;
     }
     *(size_t*)&heap[heap_pos] = size;

src/core/main.c

@@ -1,15 +1,18 @@
-#include <stdint.h>
+#include "efi.h"
+#include "quickjs.h"
+#include "stdio.h"
+#include "system_prog.h"
+#include "util.h"
+#include <stdarg.h>
 #include <stdbool.h>
 #include <stddef.h>
-#include <stdarg.h>
-#include "stdio.h"
-#include "quickjs.h"
-#include "efi.h"
-#include "util.h"
-#include "system_prog.h"
+#include <stdint.h>
 
 static EFI_SYSTEM_TABLE *gST = NULL;
 
+// Declare heap initialization function from minilibc.c
+extern void init_heap(void *system_table);
+
 void print(uint16_t *str) {
     if (gST && gST->ConOut)
         gST->ConOut->OutputString(gST->ConOut, str);
@@ -29,7 +32,8 @@ int printf(const char *format, ...) {
 }
 
 int fprintf(FILE *stream, const char *format, ...) {
-  if (stream != stdout && stream != stderr) return 0;
+  if (stream != stdout && stream != stderr)
+    return 0;
 
   char buf[1024];
   va_list ap;
@@ -44,7 +48,8 @@ int fprintf(FILE *stream, const char *format, ...) {
 }
 
 size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) {
-  if (stream != stdout && stream != stderr) return 0;
+  if (stream != stdout && stream != stderr)
+    return 0;
 
   const char *p = ptr;
   size_t total = size * nmemb;
@@ -53,7 +58,8 @@ size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) {
     
   while (i < total) {
     size_t chunk = total - i;
-    if (chunk > 1024) chunk = 1024;
+    if (chunk > 1024)
+      chunk = 1024;
     
     memcpy(buf, p + i, chunk);
     buf[chunk] = 0;
@@ -66,24 +72,27 @@ size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) {
 }
 
 int fputc(int c, FILE *stream) {
-  if (stream != stdout && stream != stderr) return c;
-  char buf[2] = { (char)c, 0 };
+  if (stream != stdout && stream != stderr)
+    return c;
+  char buf[2] = {(char)c, 0};
 
   print(AsciiToUnicode(buf));
   
   return c;
 }
 
-int putchar(int c) {
-  return fputc(c, stdout);
-}
+int putchar(int c) { return fputc(c, stdout); }
 
-// ------------------------------- Kernel C TS bindings -------------------------------
-JSValue jsKCPrintln(JSContext *ctx, JSValueConst jsThis, int argc, JSValueConst *argv) {
-  if (argc < 1) return JS_ThrowSyntaxError(ctx, "Missing argument");
+// ------------------------------- Kernel C TS bindings
+// -------------------------------
+JSValue jsKCPrintln(JSContext *ctx, JSValueConst jsThis, int argc,
+                    JSValueConst *argv) {
+  if (argc < 1)
+    return JS_ThrowSyntaxError(ctx, "Missing argument");
 
   const char *str = JS_ToCString(ctx, argv[0]);
-  if (!str) return JS_EXCEPTION;
+  if (!str)
+    return JS_EXCEPTION;
 
   print(AsciiToUnicode(str));
   print(L"\r\n");
@@ -93,25 +102,32 @@ JSValue jsKCPrintln(JSContext *ctx, JSValueConst jsThis, int argc, JSValueConst
   return JS_UNDEFINED;
 }
 
-JSValue jsKCClearScreen(JSContext *ctx, JSValueConst jsThis, int argc, JSValueConst *argv) {
+JSValue jsKCClearScreen(JSContext *ctx, JSValueConst jsThis, int argc,
+                        JSValueConst *argv) {
   gST->ConOut->ClearScreen(gST->ConOut);
 
   return JS_UNDEFINED;
 }
 
-JSValue jsKCPCIReadDword(JSContext *ctx, JSValueConst jsThis, int argc, JSValueConst *argv) {
-  if (argc < 1) return JS_ThrowSyntaxError(ctx, "Missing argument");
+JSValue jsKCPCIReadDword(JSContext *ctx, JSValueConst jsThis, int argc,
+                         JSValueConst *argv) {
+  if (argc < 1)
+    return JS_ThrowSyntaxError(ctx, "Missing argument");
 
   uint32_t addr_u32;
   JS_ToUint32(ctx, &addr_u32, argv[0]);
-  UINT64 addr = (UINT64)addr_u32; // Ensure type matches EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_RW's Address parameter
+  UINT64 addr = (UINT64)
+      addr_u32; // Ensure type matches EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_RW's
+                // Address parameter
 
-  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* pci;
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *pci;
   EFI_GUID pciGuid = EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GUID;
-  EFI_STATUS status = gST->BootServices->LocateProtocol(&pciGuid, NULL, (void**)&pci);
+  EFI_STATUS status =
+      gST->BootServices->LocateProtocol(&pciGuid, NULL, (void **)&pci);
 
   if (EFI_ERROR(status)) {
-    return JS_ThrowInternalError(ctx, "Failed to locate PCI Root Bridge IO Protocol: %d", status);
+    return JS_ThrowInternalError(
+        ctx, "Failed to locate PCI Root Bridge IO Protocol: %d", status);
   }
 
   UINT32 data = 0;
@@ -134,7 +150,8 @@ void initKC(JSContext *ctx) {
   JS_FreeValue(ctx, global);
 }
 
-// ------------------------------------- EFI main -------------------------------------
+// ------------------------------------- EFI main
+// -------------------------------------
 EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
     (void)ImageHandle;
     
@@ -143,6 +160,9 @@ EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
     
     print(L"Booting LintsOS...\r\n");
 
+  // Initialize heap with maximum available memory
+  init_heap(SystemTable);
+
     JSRuntime *rt = JS_NewRuntime();
     if (!rt) {
         print(L"!!! Kernel panic: Failed to create runtime !!!\r\n");
@@ -159,16 +179,21 @@ EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
     initKC(ctx);
     
     JSValue val;
-    JSValue eval_result = JS_Eval(ctx, SYSTEM_PROG_JS, strlen(SYSTEM_PROG_JS), "<input>", JS_EVAL_TYPE_GLOBAL);
-    if (JS_IsException(eval_result)) val = eval_result;
+  JSValue eval_result = JS_Eval(ctx, SYSTEM_PROG_JS, strlen(SYSTEM_PROG_JS),
+                                "<input>", JS_EVAL_TYPE_GLOBAL);
+  if (JS_IsException(eval_result))
+    val = eval_result;
     else {
       JS_FreeValue(ctx, eval_result);
 
       JSValue global_obj = JS_GetGlobalObject(ctx);
       JSValue kentry_func = JS_GetPropertyStr(ctx, global_obj, "KEntry");
 
-      if (JS_IsFunction(ctx, kentry_func)) val = JS_Call(ctx, kentry_func, JS_UNDEFINED, 0, NULL);
-      else val = JS_ThrowReferenceError(ctx, "KEntry function not found or not callable");
+    if (JS_IsFunction(ctx, kentry_func))
+      val = JS_Call(ctx, kentry_func, JS_UNDEFINED, 0, NULL);
+    else
+      val = JS_ThrowReferenceError(ctx,
+                                   "KEntry function not found or not callable");
 
       JS_FreeValue(ctx, kentry_func);
       JS_FreeValue(ctx, global_obj);
@@ -181,7 +206,8 @@ EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
       if (str) {
         printf("!!! Kernel panic: %s !!!\n", str);
         JS_FreeCString(ctx, str);
-      } else printf("!!! Kernel panic: [unknown] !!!\n");
+    } else
+      printf("!!! Kernel panic: [unknown] !!!\n");
       
       JS_FreeValue(ctx, ex);
     } else {
@@ -189,7 +215,8 @@ EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
       if (str) {
         printf("!!! Kernel panic: %s !!!\n", str);
         JS_FreeCString(ctx, str);
-      } else printf("!!! Kernel panic: [unknown] !!!\n");
+    } else
+      printf("!!! Kernel panic: [unknown] !!!\n");
       
       JS_FreeValue(ctx, val);
     }
@@ -197,7 +224,8 @@ EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
     JS_FreeContext(ctx);
     JS_FreeRuntime(rt);
 
-    for(;;);
+  for (;;)
+    ;
     
     return EFI_SUCCESS;
 }

src/scripts/dev-setup/default.clangd

@@ -0,0 +1,6 @@
+CompileFlags:
+  CompilationDatabase: .
+  Add:
+    - "-I%%workspaceFolder%%/src/core/compat"
+    - "-I%%workspaceFolder%%/src/lib/quickjs"
+    - "-I%%workspaceFolder%%/out/system"

src/scripts/setup_dev.sh

@@ -0,0 +1 @@
+cp ./src/scripts/dev-setup/default.clangd .clangd && sed -i.bak "s|%%workspaceFolder%%|$(pwd)|g" .clangd && rm .clangd.bak