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Kernel: Add missing ACPI resource header

This commit is contained in:
Bananymous 2025-08-19 16:22:53 +03:00
parent 70bbdbd8f5
commit 0bece8a54c
1 changed files with 179 additions and 0 deletions
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179
kernel/include/kernel/ACPI/Resource.h Normal file
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#pragma once
#include <BAN/ByteSpan.h>
#include <BAN/Debug.h>
#include <BAN/Optional.h>
namespace Kernel::ACPI
{
struct ResourceData
{
enum class Type
{
IRQ,
DMA,
IOPort,
FixedIOPort,
FixedDMA,
// TODO: large stuff the stuff :)
};
union {
struct {
uint16_t irq_mask;
union {
struct {
uint8_t edge_triggered : 1;
uint8_t : 2;
uint8_t active_low : 1;
uint8_t shared : 1;
uint8_t wake_capable : 1;
uint8_t : 2;
};
uint8_t raw;
};
} irq;
struct {
uint8_t channel_mask;
union {
struct {
uint8_t type : 2; // 0: 8 bit, 1: 8 and 16 bit, 2: 16 bit only
uint8_t bus_master : 1;
uint8_t : 2;
uint8_t channel_speed : 2; // 0: compatibility, 1: type A, 2: type B, 3: type F
uint8_t : 1;
};
uint8_t raw;
};
} dma;
struct {
uint16_t range_min_base;
uint16_t range_max_base;
uint8_t base_alignment;
uint8_t range_length;
} io_port;
struct {
uint16_t range_base;
uint8_t range_length;
} fixed_io_port;
struct {
uint16_t request_line;
uint16_t channel;
uint8_t transfer_width; // 0: 8 bit, 1: 16 bit, 2: 32 bit, 3: 64 bit, 4: 128 bit
} fixed_dma;
} as;
Type type;
};
class ResourceParser
{
public:
ResourceParser(BAN::ConstByteSpan buffer)
: m_buffer(buffer)
{}
BAN::Optional<ResourceData> get_next()
{
for (;;)
{
if (m_buffer.empty())
return {};
if (m_buffer[0] & 0x80)
{
dprintln("Skipping large resource 0x{2H}", m_buffer[0] & 0x7F);
const uint16_t length = (m_buffer[2] << 8) | m_buffer[1];
if (m_buffer.size() < static_cast<size_t>(3 + length))
return {};
m_buffer = m_buffer.slice(3 + length);
continue;
}
const uint8_t length = m_buffer[0] & 0x07;
if (m_buffer.size() < static_cast<size_t>(1 + length))
return {};
BAN::Optional<ResourceData> result;
switch ((m_buffer[0] >> 3) & 0x0F)
{
case 0x04:
if (length < 2)
break;
result = ResourceData {
.as = { .irq = {
.irq_mask = static_cast<uint16_t>((m_buffer[2] << 8) | m_buffer[1]),
.raw = (length >= 3) ? m_buffer[3] : static_cast<uint8_t>(1),
}},
.type = ResourceData::Type::IRQ,
};
break;
case 0x05:
if (length < 2)
break;
result = ResourceData {
.as = { .dma = {
.channel_mask = m_buffer[1],
.raw = m_buffer[2],
}},
.type = ResourceData::Type::DMA,
};
break;
case 0x08:
if (length < 7)
break;
result = ResourceData {
.as = { .io_port = {
.range_min_base = static_cast<uint16_t>(((m_buffer[3] << 8) | m_buffer[2]) & ((m_buffer[1] & 1) ? 0xFFFF : 0x03FF)),
.range_max_base = static_cast<uint16_t>(((m_buffer[5] << 8) | m_buffer[4]) & ((m_buffer[1] & 1) ? 0xFFFF : 0x03FF)),
.base_alignment = m_buffer[6],
.range_length = m_buffer[7],
}},
.type = ResourceData::Type::IOPort,
};
break;
case 0x09:
if (length < 3)
break;
result = ResourceData {
.as = { .fixed_io_port = {
.range_base = static_cast<uint16_t>(((m_buffer[2] << 8) | m_buffer[1]) & 0x03FF),
.range_length = m_buffer[3],
}},
.type = ResourceData::Type::FixedIOPort,
};
break;
case 0x0A:
if (length < 5)
break;
result = ResourceData {
.as = { .fixed_dma = {
.request_line = static_cast<uint16_t>((m_buffer[2] << 8) | m_buffer[1]),
.channel = static_cast<uint16_t>((m_buffer[4] << 8) | m_buffer[3]),
.transfer_width = m_buffer[5],
}},
.type = ResourceData::Type::FixedDMA,
};
break;
case 0x0F:
// End tag
return {};
case 0x06:
case 0x07:
case 0x0E:
dprintln("Skipping short resource 0x{2H}", (m_buffer[0] >> 3) & 0x0F);
break;
}
m_buffer = m_buffer.slice(1 + length);
if (result.has_value())
return result.release_value();
}
}
private:
BAN::ConstByteSpan m_buffer;
};
}