1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//! Hikari AFS Block I/O
const efi = @import("../../efi/efi.zig");
const shared_afs = @import("../../../shared/fs/afs/afs.zig");
const BlockReader = shared_afs.BlockReader;
const BlockError = shared_afs.BlockError;
/// EFI Block I/O context
pub const EfiBlockContext = struct {
block_io: *efi.protocols.BlockIoProtocol,
boot_services: *efi.services.BootServices,
partition_start_lba: u64,
block_size: u32,
cell_size: u32,
};
/// EFI block read function - implements shared BlockReader interface
pub fn efi_read_cell(context: *anyopaque, cell: u64, buffer: []u8) BlockError!void {
const ctx: *EfiBlockContext = @ptrCast(@alignCast(context));
const cell_lba = ctx.partition_start_lba + (cell * ctx.cell_size / ctx.block_size);
const read_status = ctx.block_io.read_blocks(
ctx.block_io,
ctx.block_io.media.media_id,
cell_lba,
ctx.cell_size,
buffer.ptr,
);
if (efi.types.is_error(read_status)) {
return BlockError.ReadFailed;
}
}
/// Create a BlockReader from EFI context
pub fn create_block_reader(ctx: *EfiBlockContext, total_cells: u64) BlockReader {
return BlockReader{
.context = @ptrCast(ctx),
.read_fn = efi_read_cell,
.cell_size = ctx.cell_size,
.total_cells = total_cells,
};
}
|
