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const std = @import("std");
const mem = std.mem;
const uefi = std.os.uefi;
const assert = std.debug.assert;
const Allocator = mem.Allocator;
const UefiPoolAllocator = struct {
fn getHeader(ptr: [*]u8) *[*]align(8) u8 {
return @intToPtr(*[*]align(8) u8, @ptrToInt(ptr) - @sizeOf(usize));
}
fn alignedAlloc(len: usize, alignment: usize) ?[*]u8 {
var unaligned_ptr: [*]align(8) u8 = undefined;
if (uefi.system_table.boot_services.?.allocatePool(uefi.efi_pool_memory_type, len, &unaligned_ptr) != .Success)
return null;
const unaligned_addr = @ptrToInt(unaligned_ptr);
const aligned_addr = mem.alignForward(unaligned_addr + @sizeOf(usize), alignment);
var aligned_ptr = unaligned_ptr + (aligned_addr - unaligned_addr);
getHeader(aligned_ptr).* = unaligned_ptr;
return aligned_ptr;
}
fn alignedFree(ptr: [*]u8) void {
_ = uefi.system_table.boot_services.?.freePool(getHeader(ptr).*);
}
fn alloc(
_: *anyopaque,
len: usize,
ptr_align: u29,
len_align: u29,
ret_addr: usize,
) Allocator.Error![]u8 {
_ = ret_addr;
assert(len > 0);
assert(std.math.isPowerOfTwo(ptr_align));
var ptr = alignedAlloc(len, ptr_align) orelse return error.OutOfMemory;
if (len_align == 0)
return ptr[0..len];
return ptr[0..mem.alignBackwardAnyAlign(len, len_align)];
}
fn resize(
_: *anyopaque,
buf: []u8,
buf_align: u29,
new_len: usize,
len_align: u29,
ret_addr: usize,
) ?usize {
_ = buf_align;
_ = ret_addr;
return if (new_len <= buf.len) mem.alignAllocLen(buf.len, new_len, len_align) else null;
}
fn free(
_: *anyopaque,
buf: []u8,
buf_align: u29,
ret_addr: usize,
) void {
_ = buf_align;
_ = ret_addr;
alignedFree(buf.ptr);
}
};
/// Supports the full Allocator interface, including alignment.
/// For a direct call of `allocatePool`, see `raw_pool_allocator`.
pub const pool_allocator = Allocator{
.ptr = undefined,
.vtable = &pool_allocator_vtable,
};
const pool_allocator_vtable = Allocator.VTable{
.alloc = UefiPoolAllocator.alloc,
.resize = UefiPoolAllocator.resize,
.free = UefiPoolAllocator.free,
};
/// Asserts allocations are 8 byte aligned and calls `boot_services.allocatePool`.
pub const raw_pool_allocator = Allocator{
.ptr = undefined,
.vtable = &raw_pool_allocator_table,
};
const raw_pool_allocator_table = Allocator.VTable{
.alloc = uefi_alloc,
.resize = uefi_resize,
.free = uefi_free,
};
fn uefi_alloc(
_: *anyopaque,
len: usize,
ptr_align: u29,
len_align: u29,
ret_addr: usize,
) Allocator.Error![]u8 {
_ = len_align;
_ = ret_addr;
std.debug.assert(ptr_align <= 8);
var ptr: [*]align(8) u8 = undefined;
if (uefi.system_table.boot_services.?.allocatePool(uefi.efi_pool_memory_type, len, &ptr) != .Success) {
return error.OutOfMemory;
}
return ptr[0..len];
}
fn uefi_resize(
_: *anyopaque,
buf: []u8,
old_align: u29,
new_len: usize,
len_align: u29,
ret_addr: usize,
) ?usize {
_ = old_align;
_ = ret_addr;
if (new_len <= buf.len) {
return mem.alignAllocLen(buf.len, new_len, len_align);
}
return null;
}
fn uefi_free(
_: *anyopaque,
buf: []u8,
buf_align: u29,
ret_addr: usize,
) void {
_ = buf_align;
_ = ret_addr;
_ = uefi.system_table.boot_services.?.freePool(@alignCast(8, buf.ptr));
}
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