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//! TSS Stack Allocation
const pmm = @import("../../../pmm/pmm.zig");
const common = @import("../../../../common/common.zig");
const constants = @import("../constants/constants.zig");
const memory_layout = common.constants.memory.layout;
const AllocationError = common.errors.memory.AllocationError;
pub fn allocate_kernel_stack() AllocationError!struct { base: u64, top: u64 } {
const page_count = constants.default_stack_size / 4096;
const physical_base = try pmm.allocate_contiguous(page_count);
const virtual_base = physical_base + memory_layout.physmap_base;
const stack_top = virtual_base + constants.default_stack_size;
return .{
.base = virtual_base,
.top = stack_top,
};
}
pub fn allocate_ist_stack() AllocationError!struct { base: u64, top: u64 } {
const page_count = constants.interrupt_stack_size / 4096;
const physical_base = try pmm.allocate_contiguous(page_count);
const virtual_base = physical_base + memory_layout.physmap_base;
const stack_top = virtual_base + constants.interrupt_stack_size;
return .{
.base = virtual_base,
.top = stack_top,
};
}
pub fn free_stack(base: u64, size: u64) void {
const physical_base = base - memory_layout.physmap_base;
const page_count = size / 4096;
pmm.free_range(physical_base, page_count);
}
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