forked from AbleOS/ableos
50 lines
1.4 KiB
Plaintext
50 lines
1.4 KiB
Plaintext
.{inl, outl} := @use("rel:memory.hb")
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config_read := fn(bus: u8, device: u8, func: u8, offset: u8): u32 {
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lbus := @as(u32, bus)
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ldevice := @as(u32, device)
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lfunc := @as(u32, func)
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loffset := @as(u32, offset)
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address := lbus << 16 | ldevice << 11 | lfunc << 8 | loffset & 0xFC | @as(u32, 0x80000000)
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outl(0xCF8, address)
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return inl(0xCFC)
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}
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config_write := fn(bus: u8, device: u8, func: u8, offset: u8, value: u32): void {
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lbus := @as(u32, bus)
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ldevice := @as(u32, device)
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lfunc := @as(u32, func)
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loffset := @as(u32, offset)
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address := lbus << 16 | ldevice << 11 | lfunc << 8 | loffset & 0xFC | @as(u32, 0x80000000)
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outl(0xCF8, address)
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outl(0xCFC, value)
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}
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get_header_type := fn(bus: u8, device: u8, func: u8): u8 {
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return @as(u8, config_read(bus, device, func, 0xC) >> 16 & 0xFF)
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}
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Ids := struct {vendor: u16, device: u16}
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get_ids := fn(bus: u8, device: u8, func: u8): Ids {
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res := config_read(bus, device, func, 0)
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return .(@as(u16, res >> 16 & 0xFFFF), @as(u16, res & 0xFFFF))
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}
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PciDeviceInfo := struct {header_type: u8, device: u8, bus: u8, device_id: Ids, full_class: u16, rev_id: u8}
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check_device := fn(bus: u8, device: u8): PciDeviceInfo {
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ids := get_ids(bus, device, 0)
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if ids.vendor == 0xFFFF {
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return .(0, 0, 0, .(0, 0), 0, 0)
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}
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reg2 := config_read(bus, device, 0, 0x8)
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class := @as(u16, reg2 >> 16 & 0xFFFF)
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header_type := get_header_type(bus, device, 0)
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return .(header_type, device, bus, ids, class, @as(u8, reg2 & 0xFF))
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} |