31 lines
837 B
Zig
31 lines
837 B
Zig
const physMemory = @import("mem/phys.zig");
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const log = @import("debug.zig").log;
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const mem = @import("mem.zig");
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pub const Arena = struct {
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physBase: mem.PhysicalAddress,
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capacity: usize,
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len: usize,
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pub fn setup(cap: usize) ?Arena {
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const physBase = physMemory.alloc_pages(cap / mem.vmm.PAGE_SIZE) orelse return null;
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return .{
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.physBase = physBase,
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.capacity = cap,
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.len = 0
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};
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}
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pub fn create(self: *@This(), comptime T: type) *T {
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if (self.len + @sizeOf(T) > self.capacity) {
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log.panic("Out of memory. Cannot allocate {} bytes", .{ @sizeOf(T) });
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}
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const v = self.physBase.add(self.len).virtualize();
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const ptr = @as(*T, @ptrFromInt(v));
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self.len += @sizeOf(T);
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return ptr;
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}
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};
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