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Kernel: Entering ACPI mode now actually enables ACPI 

I used to only initialize devices, but now I send ACPI_ENABLE if
machine is not hardware reduced.
This commit is contained in:
Bananymous 2024-04-10 15:05:09 +03:00
parent 0ff68b7d66
commit 3f2e110eab
1 changed files with 79 additions and 13 deletions
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92
kernel/kernel/ACPI/ACPI.cpp
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@ -9,6 +9,7 @@
#include <kernel/BootInfo.h>
#include <kernel/IO.h>
#include <kernel/Memory/PageTable.h>
#include <kernel/Timer/Timer.h>
#define RSPD_SIZE 20
#define RSPDv2_SIZE 36
@ -16,6 +17,27 @@
namespace Kernel::ACPI
{
enum PM1Event : uint16_t
{
PM1_EVN_TMR_EN = 1 << 0,
PM1_EVN_GBL_EN = 1 << 5,
PM1_EVN_PWRBTN_EN = 1 << 8,
PM1_EVN_SLPBTN_EN = 1 << 8,
PM1_EVN_RTC_EN = 1 << 10,
PM1_EVN_PCIEXP_WAKE_DIS = 1 << 14,
};
enum PM1Control : uint16_t
{
PM1_CNT_SCI_EN = 1 << 0,
PM1_CNT_BM_RLD = 1 << 1,
PM1_CNT_GBL_RLS = 1 << 2,
PM1_CNT_SLP_EN = 1 << 13,
PM1_CNT_SLP_TYP_MASK = 0b111,
PM1_CNT_SLP_TYP_SHIFT = 10,
};
struct RSDT : public SDTHeader
{
uint32_t entries[];
@ -276,6 +298,14 @@ namespace Kernel::ACPI
return;
}
auto slp_typa = s5_package->elements[0]->as_integer();
auto slp_typb = s5_package->elements[1]->as_integer();
if (!slp_typa.has_value() || !slp_typb.has_value())
{
dwarnln("Failed to get SLP_TYPx values");
return;
}
auto pts_object = m_namespace->find_object({}, AML::NameString("\\_PTS"));
if (pts_object && pts_object->type == AML::Node::Type::Method)
{
@ -297,20 +327,24 @@ namespace Kernel::ACPI
dprintln("Executed \\_PTS");
}
auto* fadt = static_cast<const FADT*>(get_header("FACP", 0));
uint16_t SLP_EN = 1 << 13;
uint16_t PM1a_CNT = fadt->pm1a_cnt_blk;
uint16_t PM1b_CNT = fadt->pm1b_cnt_blk;
uint32_t SLP_TYPa = s5_package->elements[0];
uint32_t SLP_TYPb = s5_package->elements[1];
dprintln("Entering sleep state S5");
IO::outw(PM1a_CNT, SLP_TYPa | SLP_EN);
if (PM1b_CNT != 0)
IO::outw(PM1b_CNT, SLP_TYPb | SLP_EN);
auto* fadt = static_cast<const FADT*>(get_header("FACP", 0));
uint16_t pm1a_data = IO::inw(fadt->pm1a_cnt_blk);
pm1a_data &= ~(PM1_CNT_SLP_TYP_MASK << PM1_CNT_SLP_TYP_SHIFT);
pm1a_data |= (slp_typa.value() & PM1_CNT_SLP_TYP_MASK) << PM1_CNT_SLP_TYP_SHIFT;
pm1a_data |= PM1_CNT_SLP_EN;
IO::outw(fadt->pm1a_cnt_blk, pm1a_data);
if (fadt->pm1b_cnt_blk != 0)
{
uint16_t pm1b_data = IO::inw(fadt->pm1b_cnt_blk);
pm1b_data &= ~(PM1_CNT_SLP_TYP_MASK << PM1_CNT_SLP_TYP_SHIFT);
pm1b_data |= (slp_typb.value() & PM1_CNT_SLP_TYP_MASK) << PM1_CNT_SLP_TYP_SHIFT;
pm1b_data |= PM1_CNT_SLP_EN;
IO::outw(fadt->pm1b_cnt_blk, pm1b_data);
}
}
BAN::ErrorOr<void> ACPI::enter_acpi_mode(uint8_t mode)
@ -321,6 +355,38 @@ namespace Kernel::ACPI
return BAN::Error::from_errno(EFAULT);
}
// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/16_Waking_and_Sleeping/initialization.html#placing-the-system-in-acpi-mode
auto* fadt = static_cast<const FADT*>(get_header("FACP", 0));
// If not hardware-reduced ACPI and SCI_EN is not set
if (!(fadt->flags & (1 << 20)) && IO::inw(fadt->pm1a_cnt_blk) & PM1_CNT_SCI_EN)
{
// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/04_ACPI_Hardware_Specification/ACPI_Hardware_Specification.html#legacy-acpi-select-and-the-sci-interrupt
IO::outb(fadt->smi_cmd, fadt->acpi_enable);
// Spec says to poll until SCI_EN is set, but doesn't specify timeout
for (size_t i = 0; i < 100; i++)
{
if (IO::inw(fadt->pm1a_cnt_blk) & PM1_CNT_SCI_EN)
break;
SystemTimer::get().sleep(10);
}
if (!(IO::inw(fadt->pm1a_cnt_blk) & PM1_CNT_SCI_EN))
{
dwarnln("Failed to enable ACPI mode");
return BAN::Error::from_errno(EINVAL);
}
// Enable power and sleep buttons
IO::outw(fadt->pm1a_evt_blk + fadt->pm1_evt_len / 2, PM1_EVN_PWRBTN_EN | PM1_EVN_SLPBTN_EN);
IO::outw(fadt->pm1b_evt_blk + fadt->pm1_evt_len / 2, PM1_EVN_PWRBTN_EN | PM1_EVN_SLPBTN_EN);
}
dprintln("Entered ACPI mode");
dprintln("Initializing devices");
// Evaluate \\_SB._INI
auto _sb_ini = m_namespace->find_object({}, AML::NameString("\\_SB._INI"));
if (_sb_ini && _sb_ini->type == AML::Node::Type::Method)
@ -365,7 +431,7 @@ namespace Kernel::ACPI
method->evaluate(args);
}
dprintln("Entered ACPI mode");
dprintln("Devices are initialized");
return {};
}