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Word of god

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This commit is contained in:
Chris
2026-02-06 10:46:30 +01:00
parent afc85e8964
commit 6c4a8bd724
9 changed files with 33 additions and 14 deletions
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11
src/kernel/vm.c
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@@ -23,6 +23,7 @@ static int stack[VM_STACK_SIZE];
static unsigned long int rand_next = 1;
static int sp = 0;
static uint8_t memory[VM_MEMORY_SIZE]; // 64KB Linear RAM
static int vm_heap_ptr = 8192;
// --- Graphics Overlay Support ---
typedef struct {
@@ -62,6 +63,7 @@ static void mem_write32(int addr, int val) {
static void vm_reset(void) {
sp = 0;
cli_memset(memory, 0, VM_MEMORY_SIZE);
vm_heap_ptr = 8192;
}
static void push(int val) {
@@ -189,11 +191,10 @@ static void vm_syscall(int id) {
// Let's implement a dummy malloc that returns an index into memory
// Starting at 1024 (reserve first 1K for globals)
case SYS_MALLOC: {
static int heap_ptr = 1024;
int size = pop();
int res = heap_ptr;
heap_ptr += size;
if (heap_ptr >= VM_MEMORY_SIZE) {
int res = vm_heap_ptr;
vm_heap_ptr += size;
if (vm_heap_ptr >= VM_MEMORY_SIZE) {
push(0); // OOM
} else {
push(res);
@@ -305,6 +306,7 @@ static void vm_syscall(int id) {
if (addr >= 0 && addr < VM_MEMORY_SIZE) {
cli_itoa(val, (char*)&memory[addr]);
}
push(0);
break;
}
case SYS_PEEK: push(mem_read32(pop())); break;
@@ -312,6 +314,7 @@ static void vm_syscall(int id) {
int val = pop();
int addr = pop();
mem_write32(addr, val);
push(0);
break;
}
case SYS_EXEC: pop(); push(-1); break; // Not impl